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SKF four-row taper roller bearings set new performance standards

Jetzt mit the neuen Now with den new SKF Explorer bearings SKF Explorer Lagern!

Contents
The SKF brand now stands for more than ever before, and means more to you as a valued customer. While SKF maintains its leadership as the hallmark of quality bearings throughout the world, new dimensions in technical advances, product support and services have evolved SKF into a truly solutions-oriented supplier, creating greater value for customers. These solutions encompass ways to bring greater productivity to customers, not only with breakthrough application-specific products, but also through leadingedge design simulation tools and consultancy services, plant asset efficiency maintenance programs, and the industry’s most advanced supply management techniques. The SKF brand still stands for the very best in rolling bearings, but it now stands for much more. SKF – The knowledge engineering company

1 Product information .................................................
Quality and choice ......................................................... Why four-row taper roller bearings? ............................ Why four-row taper roller bearings from SKF? ........... Unique design features ................................................. SKF Explorer bearings – a quantum leap forwards ... Proven bearing arrangements .....................................

3 3 3 3 4 6 8

2 Recommendations

.................................................. 10

Aplication advices .......................................................... 10 Design of bearing arrangements ................................. 10 Lubrication ................................................................... 11 Mounting...................................................................... 12 Monitoring the bearings in operation ........................... 13 Dismounting................................................................. 14 Disassembling SKF Explorer inner rings and cage and roller assemblies................................................... 14 Reassembling SKF Explorer inner rings and cage and roller assemblies................................................... 15 Bearing storage ........................................................... 15

3 Product data ............................................................. 16
General bearing data...................................................... 16 Designs ........................................................................ 16 Design identification ..................................................... 18 SKF Explorer class bearings........................................ 19 Dimensions .................................................................. 19 Tolerances.................................................................... 19 Internal clearance ........................................................ 19 Influence of operating temperature on bearing material ........................................................... 19 Minimum load............................................................... 19 Equivalent dynamic bearing load ................................. 19 Equivalent static bearing load ...................................... 19 Comparative load ratings ............................................. 20 Designations and suffixes ............................................ 20 Product table .................................................................. 22 Other SKF products ..................................................... 34 CR radial shaft seals and V-ring seals ............................. 34 CR repair sleeves ............................................................. 35 SKF lubricating greases ................................................... 36 SKF – The knowledge engineering company ........... 38

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1 Product information
Customer benefits

2 Recommendations
Page ............. 10

3 Product data
Page ............. 16

Quality and choice
Why four-row taper roller bearings?
Four-row taper roller bearings are used successfully worldwide for rolling mill bearing arrangements, particularly as work and back-up roll bearings for hot as well as cold rolling mills. As they can support both heavy radial loads and simultaneously acting axial loads they permit simple and cost effective roll neck bearing arrangements. Specific features of these SKF bearings are, among others, logarithmic contact profile between rollers and raceways provides a more favourable stress distribution in the bearing and considerably enhances operational reliability, special roller end/flange contact geometry designed to promote lubrication and minimise friction and, of course, quality of SKF manufacture. However, the technical development of SKF four-row taper roller bearings has been driven yet further. The result – the SKF Explorer four-row taper roller bearings – sets a completely new performance standard. To appreciate the excellent features and benefits of SKF Explorer bearings, read more about them on the following pages.

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Why four-row taper roller bearings from SKF?
SKF is long acquainted with the use of rolling bearings in rolling mills. As early as 1922 SKF introduced roller bearings as roll neck bearings in the SKF steelworks Hofors Bruk. Since then both builders and operators of rolling mills have benefitted from innovative SKF bearing technology. SKF four-row taper roller bearings are available in a wide range of sizes and designs appropriate to the application. These include TQO and TQI configuration (face-to-face or back-toback arangement), sealed and open bearings, bearings with or without extended inner rings, bearings with cylindrical or tapered bore, bearings with and without spacer rings.

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1 Product information
Design features

2 Recommendations
Page ............. 10

3 Product data
Page ............. 16

Unique design features
Even load distribution under normal loads; extended roller/raceway contacts, i.e. lower stresses

SKF taper roller bearings are state-ofthe-art products. This was particularly true for the contact conditions in standard bearings, but is even more so for the SKF Explorer bearings.

Favourable stress distribution The contact geometry between the rollers and raceways has been much improved by the use of logarithmic contact profile geometry resulting in optimized stress distribution in the bearing under all conditions of load and misalignment.

Improved stress distribution due to reduced edge stresses under heavy loads and also when misaligned, i.e. much higher operational reliability.

Improved roller end/flange contact, i.e. optimized lubrication, minimized friction

The C design of the seal leaves space for rollers that are almost as long as those of open bearings so that the load carrying capacity is almost equal.

Bearings without spacer rings are simpler to mount and the load distribution is better

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1 Product information
Design features Efficient lubrication The superior logarithmic contact profile and the optimized raceway surfaces of the rings and rollers not only improve lubrication conditions but are also less demanding of the lubricant. Efficient lubrication of the flange The special form of the surfaces of the inner ring guide flanges and the large ends of the rollers considerably enhance lubricant film formation in the sliding roller end/flange contacts.

2 Recommendations
Page ............. 10 Well-designed seals The radial shaft seals of SKF four-row taper roller bearings have the form of a C and extend over the cages of the two outboard roller and cage assemblies. Because of the compact design the bearing can incorporate rollers of the same, or almost the same length as the open bearing of the same dimensions so that the load carrying capacity is the same or very similar. A stainless steel garter spring enables the sealing lip to exert the requisite pressure. The seals are thermally and chemically stable and can operate at high sliding velocities. O-rings inserted in grooves in the outer ring outside surface prevent dirt

3 Product data
Page ............. 16 and water from penetrating between the outer rings and the chock bore, from where it can contaminate the bearing and cause corrosion. Spacer rings – if needed Even though most of the bearings in the SKF range of four-row taper roller bearings are now made without spacer rings, bearings with spacer rings are available for applications where they are needed. Better: without spacer rings Bearings without spacer rings are generally the better engineering solution and have two main advantages: They comprise fewer component parts and can thus be mounted more easily and quickly. Four separate outer rings contribute to a more even load distribution and consequently, a longer service life.

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1 Product information
Design features

2 Recommendations
Page ............. 10

3 Product data
Page ............. 16

SKF Explorer bearings – a quantum leap forwards
SKF Explorer bearings are made of extremely clean steel.
oxygen content

normal bearing steel

steel for SKF Explorer bearings

The performance of the previous standard taper roller bearings has confirmed the benefits of the improved roller/raceway geometry and the optimized roller end/flange contact. In addition the new SKF Explorer performance class four-row taper roller bearings meet important customer demands and are characterized by higher load carrying capacity, longer service life, unique inspection/maintenance capabilities, improved seals. Higher load carrying capacity The steel used for SKF Explorer bearings has high purity and extreme low oxygen content. The reduction in the number of inclusions increases the fatigue strength as well as the wear

resistance and enhances the ability to support heavy and shock loads and increases the dynamic load carrying ability. Longer service life Increased dynamic load carrying capacity implies longer service life and this is reinforced and extended by the benefits derived from a further refinement of the contact geometry, an increase in flange strength, an increase in manufacturing quality. A new heat treatment process provides an excellent balance between material hardness and toughness. The high surface hardness increases wear resistance, which is particularly important under the tough operating condi-

Modified cage pocket design improves lubrication.

The new seal made of environmentally friendly material seals more efficiently against the rotating inner ring.

The cage and roller assemblies can be separated from the inner rings – no special tools are required.

The maintenancefriendly seals are easy to remove and reinstall.

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1 Product information
Design features tions in rolling mills, characterized by contamination by scale and water. The lubrication conditions in the bearings have also been further improved. Modified cage pocket design improves lubrication at the sliding contact between rollers and cages. The special raceway surface contributes to excellent lubricant film formation at the contacts between rollers and raceways. Finally, the precise matching between the roller rows makes for a more even load distribution over all four rows of rollers. There is thus a solid foundation for the longer service life of the SKF Explorer bearings compared with their predecessors. Improved seals The new seals are made of environmentally friendly hydrogenated acrylonitrile butadiene rubber. The new seal design has resulted in improved retention and sealing in the outer ring and increased sealing efficiency against the inner ring land. Unique inspection/maintenance capabilities Under the operating conditions which some four-row taper roller bearings are exposed to even the best bearings

2 Recommendations
Page ............. 10 require efficient maintenance. The newly developed cage allows the cage and roller assemblies to be removed from the inner rings and to be reinstalled. It is now possible to inspect the inner rings completely and if necessary, to refurbish them. The seals also have been redesigned to be more maintenance-friendly. They are simply snapped into their retaining grooves. Dismounting and reinstallation could not be easier. Efficient refurbishment The SKF Explorer four-row taper roller bearings have decisive advantages when it comes to refurbishment: The cage and roller assemblies can now be easily dismantled from, and reassembled to the inner rings, allowing full inspection and eventual refurbishment. Cage and roller assemblies and inner and outer rings of various bearings can now be combined as desired to form “new” bearings. All that is required is to regrind the ring side faces, which is now also possible for inner rings. The new seal design permits quick removal and installation.

3 Product data
Page ............. 16 Availability The most popular four-row taper roller bearings are already produced to the SKF Explorer performance class specifications. The designations of the SKF Explorer bearings are printed in blue in the product table. Product identification The designation of an SKF Explorer four-row taper roller bearing is the same as that of the previous standard bearing except that it carries the suffix E for easy recognition.

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1 Product information
Rolling mills

2 Recommendations
Page ............. 10

3 Product data
Page ............. 16

Proven bearing arrangements
Applications heavy plate mills hot strip mills G cold rolling mills G skin pass mills G roughing mills G universal beam mills G rod, bar and wire mills
G G

Requirements long service life precisely defined performance G low maintenance G no unplanned stoppages G environmental friendliness G technical support
G G

Solution

SKF four-row taper roller bearings have been successfully used in rolling mills around the world for decades. The bearings are characterized by accuracy and reliability even under extreme operating conditions. Whether in hot or cold rolling mills for flat products or profiles, SKF fourrow taper roller bearings are often the first choice. Over the past 80 years, SKF has accumulated considerable experience with rolling bearings in the steel industry and this know-how is always available to customers of the world's leading rolling bearing manufacturer. SKF application engineers provide support to both machine builders and end users around the world. On request, SKF experts will assist in mounting bearings and training maintenance personnel. When needed, SKF specialists are available on site anywhere in the world – saving time and money for the customer.

L

L

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1 Product information
Rolling mills

2 Recommendations
Page ............. 10

3 Product data
Page ............. 16

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1 Product information
Page ............. 3

2 Recommendations
Bearing arrangement design

3 Product data
Page ............. 16

Application advices
Design of bearing arrangements
Roll neck requirements In most rolling mill applications fourrow taper roller bearings are mounted with a loose fit on the roll neck. The roll neck journal and the axial abutment for the inner rings must have a certain minimum hardness. The recommended hardness is 45 Shore (≈ 34 HRC) for the roll neck surface and 60 Shore (≈ 45 HRC) for the axial abutments for the inner rings Axial location of inner rings on the roll neck The inner rings must not be axially clamped. There must remain a total clearance between the bearing rings and their abutments of 0,2 to 1,3 mm ( fig 1 ).

The inner rings must not be axially clamped on the roll neck Fig 1

0,2 -1,3

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1 Product information
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2 Recommendations
Lubrication Completely sealed bearings without lubrication facility The bearings without relubrication facility should be filled with a high quality grease on mounting. The SKF grease LGHB 2 ( page 36 ). is recommended. The bearings normally are in operation in the chock for some 1 000 to 1 500 hours, depending on the working conditions. They are then removed from the chock, dismounted, washed, preserved, inspected and then filled with grease and remounted in the cleaned and inspected chock, the outer rings having been turned to expose a fresh loaded zone. Air-oil lubrication for sealed bearings The sealed bearings with relubrication feature when lubricated by air-oil can contribute to improved operational economy and reliability, particularly in cold rolling mills. The air-oil mixture is introduced from above via the grooves in the side faces of the individual outer rings ( fig 2 ). Compared with oil mist lubrication, only about one tenth

3 Product data
Page ............. 16 of the lubricant quantity is required. The oil can be very accurately metered so that there is no risk of over-lubrication with its attendant heat generation at high rolling speeds. Oil having a viscosity of up to 700 mm2/s can be used and requires no heating. Metered drops are transported to the bearing along the walls of the ducts and leads by air. The drops are released from the ducts and finally collect at the bottom of the bearing. The air exits via the seals and is clean so that it does not contaminate the environment. The air stream then exits via the radial shaft seal, the V-ring and the labyrinth and serves to enhance the sealing efficiency of the labyrinth seal. The air supplied to the air-oil lubrication equipment should be dried to prevent moisture being introduced into the bearing and causing corrosion. Because the conditions in the chock are relatively clean, the use of the airoil method can appreciably extend the service life of the bearings.

Lubrication
No bearing arrangement will function properly unless it is adequately lubricated. Depending on the design, several options are available for the lubrication of SKF four-row taper roller bearings. Bearings without seals may be lubricated with grease (continuously or periodically) or with oil: oil bath, oil bath supplemented with oil-air, oil mist or circulating oil. Sealed four-row taper roller bearings are manufactured to two designs: bearings which can be relubricated, the VA901 and VA903 or E1 and E3 executions for grease or oil lubrication, and completely sealed bearings, the VA902 or E2 executions only for grease lubrication.

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Sealed four-row taper roller bearing lubricated by air-oil Fig 2

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1 Product information
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2 Recommendations
Mounting is packed with each bearing. This carefully describes the various steps involved ( fig 4 ). Loaded zone markings In the majority of cases in rolling mills, the outer rings of the bearings are subjected to a point load (constant direction). This means that only a section of the outer ring raceway will be under load. For this reason, the outer rings are divided into four zones which are indicated by the markings I to IV on the side faces of the rings ( fig 5 ). The markings indicating load zone I are also indicated by a line extending across the whole width of the outer rings. When mounting for the first time it is customary to install the bearing so that the zone I lies in the direction of the load. After each inspection, the outer rings should be turned so that another zone becomes the loaded zone. The order I, III, II, IV is recommended.

3 Product data
Page ............. 16
Fig 3

Mounting
Four-row taper roller bearings are high-precision mechanical components and should therefore be handled with appropriate care when mounting and dismounting. It is important to use the appropriate aids and tools and to follow the instructions supplied with each bearing. Detailed information is also contained in the SKF publications “Mounting and maintenance instructions for four-row taper roller bearings” and “Four-row taper roller bearings with out spacer rings – mounting and maintenance instructions”. Matching the bearing components When mounting four-row taper roller bearings, the individual components of the bearing must be mounted in the correct order. Parts belonging together are identified by letter markings. All the components of one bearing are also marked with the same serial number, so that the parts of one bearing are not mixed with those of another when several bearings are mounted at the same time ( fig 3 ). NOTE: To make sure that the bearing components are mounted in the correct order, a sheet containing mounting instructions

Marking of parts belonging together with serial number and letters

Mounting instructions are supplied with every bearing Fig 4

Load zone markings on the outer ring Fig 5

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1 Product information
Page ............. 3

2 Recommendations
Monitoring in operation Roll neck bearing arrangement with the Smart Chock Unit The SKF system “Smart Chock Unit” enables reliable online monitoring of rolling mill bearing arrangements as well as the registration of the forces and temperatures occurring. The system includes intelligent analysis software as well as all the sensors and wiring required for condition monitoring ( fig 6 ). The SKF Smart Chock Unit can be used to measure the axial and radial forces in operation, record the temperatures and temperature distribution, and continually monitor the condition of the roll neck bearing arrangement.

3 Product data
Page ............. 16 The following benefits for the rolling mill operator derive from the above: By detecting the signs of impeding failure at an early stage, failures can be virtually eliminated, thus unplanned stoppages and costly damage to plant can be avoided. Productivity is increased. Fewer unplanned stoppages increase plant uptime. The quality of the rolled material can be improved. The system supports process control by providing input data.

Monitoring the bearings in operation
SKF has considerable experience in the field of condition monitoring. The procedures developed by SKF are based on multi-parameter measurements. In addition to vibration measurements involving vibration velocity, vibration acceleration enveloping and SEE (Spectral Emitted Energy) other physical measurement categories are also measured for condition monitoring. The SKF system “Smart Chock Unit” has been specially developed for roll neck bearing monitoring.

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The “Smart chock unit”, an SKF solution for roll neck bearing arrangements Fig 6

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1 Product information
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2 Recommendations
Dismounting

3 Product data
Page ............. 16
Fig 7

Dismounting
Four-row taper roller bearings are dismounted in the reverse order of mounting. Bearings that are to be reused after dismounting should be treated with the same care as when mounting. The bearing components should be carefully washed and oiled. If damage is detected in the outer ring raceway, the rollers and inner ring raceways must also be checked for damage. The user can usually repair minor damages. Bearings that are damaged can often be repaired by an SKF Service Centre.

Disassembling SKF Explorer inner rings and cage and roller assemblies
The inner rings with cage and roller assemblies of SKF Explorer four-row taper roller bearings can be separated. This allows for easy and full inspection of the inner ring raceways and refurbishment. For the separation a strip of spring steel and two screwdrivers are required. The screwdrivers should have a maximum hardness of 45 HRC to avoid damage to the bearing. It is recommended that the following procedure be followed:

Fig 8

1. Displace the cage radially in one direction to obtain the maximum roller clearance between inner ring and cage at this side ( fig 7 ). 2. Insert the spring steel strip between the inner ring and roller at this side, supporting it on the outer retaining flange ( fig 8 ). 3. Place one screwdriver against the inner guide flange close to the strip and lift the cage and roller assembly on to the retaining flange. Use the second screwdriver to lift each individual roller, one at a time, over the retaining flange until the cage and roller assembly can be removed from the inner ring ( fig 9 ). 4. As the cage is removed the rollers will fall out ( fig 10 ). A suitable surface should be provided so that the rollers are not damaged or contaminated. 5. The rollers of a cage and roller assembly must remain together and not be mixed with rollers of another assembly.

Fig 9

Fig 10

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1 Product information
Page ............. 3
Fig 11

2 Recommendations
Dismounting

3 Product data
Page ............. 16

Resassembling SKF Bearing storage Explorer inner rings and Before being packaged in wooden cage and roller assemcrates, SKF four-row taper roller bearings are treated with a rust-inhibiting blies medium. They can be stored in their
To reassemble it is recommended to proceed as follows (the figures illustrate the reassembling of the second roller and cage assembly): 1. Insert the rollers into the cage with the small roller diameter downwards. A support ring may be used to prevent the rollers from falling out again ( fig 11 ). 2. Put the inner ring into the cage and roller assembly ( fig 12 ) and turn all the components together ( fig 13 ). 3. Snap the cage and roller assembly over the outer retaining flange by hand ( fig 14 ). With larger bearings the force required might be so large that a screwdriver should be used. original unopened packaging for several years, provided the relative humidity in the storage room does not exceed 60 %. The bearings must be stored lying down and should only be removed from the packaging just before mounting in order to prevent them from becoming dirty.

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Fig 12

Fig 13

Fig 14

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1 Product information
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2 Recommendations
Page ............. 10

3 Product data
Designs

General bearing data
Designs
Open bearings SKF four-row taper roller bearings are primarily produced with the TQO configuration ( fig 1 ) in the TQON design without spacer rings ( fig 2 ) In the TQO configuration, there are two roller and cage assemblies arranged face-to-face. The bearings are normally supplied with pressed steel window-type cages, although the larger sizes may have pierced rollers and steel pin-type cages ( fig 3 ). Four-row taper roller bearings are also produced with extended inner rings, which can serve as counterfaces for radial shaft seals ( fig 4 ). Also these bearings can be supplied without spacer rings (design TQOEN) or with spacer rings (design TQOE). Four-row taper roller bearings that are to be mounted with a loose fit on the roll neck, are normally supplied with a helical groove in the inner ring bore and lubrication grooves in the side faces of the inner rings. The lubrication grooves enable lubricant to be supplied to the contact surfaces of the inner rings and journal seating where there is a risk of wear occurring. Lubricant is stored and wear particles can be deposited in the helical grooves. This reduces wear of the roll neck. Sealed bearings Sealed SKF four-row taper roller bearings are available in many sizes and designs. Whenever possible, sealed bearings should be used for rolling mills. Compared with open bearings they offer considerable advantages: they achieve longer service lives, grease consumption is reduced (by up to 90 %), maintenance intervals can be extended, and grease does not escape from the 16 bearings and the emulsions used for rolling do not become contaminated. Sealed bearings meet the ecological and economic requirements now being set. Sealed bearings can simply
Fig 1 TQO configuration Open bearing with spacer rings

Fig 2

TQON design Open bearing without spacer rings

Fig 3

TQON.1 design Open bearing without spacer rings with pierced rollers and steel pin-type cage

Fig 4

TQOEN design Open bearing with extended inner rings. The extensions to the inner rings are designed as concentric sliding surfaces for radial shaft seal

replace open bearings as part of a rebuild or refurbishment because the boundary dimensions are the same. Sealed bearings are fitted with specially developed, C-shaped radial shaft seals on both sides. The seals permit

1 Product information
Page ............. 3 high sliding velocities and are intended for operating temperatures between –20 and +140 °C. The SKF Explorer bearings have sheet steel reinforced radial shaft seals made of hydrogenated acrylonitrile butadiene rubbern (HNBR). They are snapped into the groove in the outer ring. The other standard bearings have seals made of fluoro rubber (FPM) and reinforced with sheet steel. They are staked in a groove in the outer ring. Fluoro rubber seals require special handling (“Safety precautions”). O-rings inserted in grooves in the outer ring outside surface prevent dirt or water from entering between the outer rings and the chock bore. Design E1 and VA901 Sealed E1 and VA901 design bearings ( fig 5 ) can be relubricated via lubrication grooves in the outer rings. In bearings without spacer rings, the seal between the two inner rings consists of a steel reinforced ring of acrylonitrile butadiene rubber. In bearings with spacer rings, the sealing between the inner rings is performed by two Orings as shown in fig 8 The permissible operating temperature range for these seals is –40 to +100 °C. Design E2 and VA902 Sealed E2 and VA902 design bearings ( fig 6 ) ) correspond to the E1 and VA901 designs, but cannot be relubricated. Design E3 and VA903 Sealed E3 and VA903 design bearings ( fig 7 ) have no seal between the inner rings. All other features are same as for E1 and VA091 design bearings

2 Recommendations
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3 Product data
Designs
Fig 5 Designs E1 and VA901 Sealed bearing without spacer rings, with lubrication grooves in the outer ring faces

Fig 6

Designs E2 and VA902 Sealed bearing without spacer rings, no relubrication facilities

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Fig 7

Designs E3 and VA903 Sealed bearing, with lubrication grooves in the outer ring faces but without seal between the inner rings

Warning: Safety precautions for fluoro rubber Fluoro rubber is very stable and harmless in normal operating conditions up to +200 °C. However, if exposed to extreme temperatures above 300 °C, e.g. fire or the flame of a cutting torch, fluoro rubber seals give off hazardous fumes. These fumes can be harmful if inhaled, as well as to the eyes. In addition, once the seals have been heated to such temperatures, they are dangerous to handle even after they have cooled and should not touch the skin. If it is necessary to handle bearings with seals that have been subjected to high temperatures, such as when dismounting the bearing, the following safety precautions should be observed: always wear protective goggles, gloves and appropriate breathing apparatus, place the remains of the seals in an airtight plastic container marked with a symbol for “material will etch”, follow the safety precautions in the appropriate material safety data sheet (MSDS). If there is unintentional contact with the seals, wash hands with soap and plenty of water and flush eyes with plenty of water and consult a doctor immediately. If the fumes have been inhaled, consult a doctor immediately. The user is responsible for the correct use of the product during its service life and its proper disposal. SKF takes no responsibility for the improper handling of fluoro rubber seals or for any injury resulting from their use.

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1 Product information
Page ............. 3 Other bearing design variants In addition to the bearings shown in the product table starting on page 22, SKF also supplies four-row taper roller bearings in another configuration and many other design variants. This includes, for example, bearings with inner and outer intermediate (spacer) rings between the roller rows Nos. 2 and 3 ( fig 8 ). Bearings with the taper roller and cage assembly pairs in a back-toback arrangement are also produced (TQI configuration). These bearings have one double row and two single row inner rings and two double row outer rings ( fig 9 ). This arrangement of the roller rows provides relatively stiff bearing arrangements which can take up high tilting moments. For certain applications SKF also supplies bearings with a tapered bore. These are required when the bearing is to be mounted with a tight fit on the journal, for example, when high rolling speeds are to be employed. Details of these other bearings will be found in the SKF catalogue “Large bearings” and the “SKF Interactive Engineering Catalogue” on CD-ROM or online at www.skf.com.

2 Recommendations
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3 Product data
Designs
Fig 8 TQOSNP design Sealed bearing without spacer rings, but with a spacer sleeve between the pairs of roller and cage assemblies

Fig 9

TQI design Open bearing, pairs of roller and cage assemblies arranged back-toback

Fig 10

Design variant identification

SI WI G

Design identification
To enable the easy identification of the various different designs and variants, letters or letter combinations are given under the heading “Design” in the product table e.g. TQON/GW. The first part of the identification corresponds to the configurations and designs described on pages 16 to 18 and shown in figs 1 to 9 . The letters follow-ing the oblique stroke identify variants ( fig 10 ) and are explained below. G helical groove in the bearing bore GW G+W GWI G + WI GWSI G + W + SI GWISI G + WI + SI GWOY G + WO + Y LS lubrication holes in the inner ring extensions

W

WI WILS WO SI Y

lubrication grooves in the side faces of both outer and inner rings lubrication grooves in the inner ring side faces WI + LS lubrication grooves in the outer ring side faces seal between the two inner rings annular groove and lubrication holes in the inner rings and gap between the inner rings

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1 Product information
Page ............. 3

2 Recommendations
Page ............. 10

3 Product data
General bearing data

SKF Explorer class bearings
SKF Explorer four-row taper roller bearings are available as open bearings without spacer rings or as sealed bearings. The helical groove in the bore and case hardened bearing rings are standard for SKF Explorer bearings and are thus not identified by suffixes in the designation.

Internal clearance
SKF four-row taper roller bearings are delivered as ready-to-mount bearing units with an axial internal clearance adapted to the actual application. For the SKF Explorer bearings the mean value of the axial internal clearance expressed in m is shown in the designation, preceded by the suffix C, e.g. C300 for a mean clearance of 300 m (from 270 to 330 m).

Equivalent dynamic bearing load
For dynamically loaded four-row taper roller bearings P = Fr + Y1Fa P = 0,67 Fr + Y2Fa bei Fa/Fr ≤ e bei Fa/Fr > e

The values for the calculation factors e, Y1 and Y2 will be found in the product table.

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Dimensions
The boundary dimensions of four-row taper roller bearings have not been standardized by ISO. The dimensions of many of the cones and cups of the inch-size bearings do, however, conform to the ABMA Standard 19-1974 or ANSI B3.19-1975. The bore and outside diameters, however, often approximate to those of ISO 15:1998 Diameter Series 9 or 0.

Influence of operating Equivalent static bearing temperatures on bearing load material For statically loaded four-row taper
SKF four-row taper roller bearings are subjected to a special heat treatment such that they can be operated at temperatures of up to +150 °C without any inadmissible dimensional changes occurring. roller bearings P0 = Fr + Y0Fa Values for the calculation factor Y0 will be found in the product table.

Tolerances
SKF four-row taper roller bearings are produced with dimensional accuracy corresponding to the Normal tolerance classes for metric and inch-size bearings, respectively. The running accuracy of all bearings is to tolerance class P5 specifications for metric taper roller bearings. The width tolerance of the inner rings is ± 0,25 mm for bearings without spacer rings, and ± 1,524 mm for bearings with spacer rings. Exceptions to this are indicated in the product table by footnotes. The tolerances of the metric bearings conform to ISO 492:2002 and those of the inch-size bearings follow class 4, ISO 578:1987 and ABMA Standard 19.2-1994.

Minimum load
In order to guarantee the satisfactory performance the bearings must always be subjected to a given minimum load. Otherwise the inertia forces of the rollers and cages and the friction in the lubricant can have a detrimental influence on rolling conditions in the bearing and may cause sliding movements to occur between the rollers and raceways. The requisite minimum load to be applied can be obtained from Frm = 0,02 C where Frm = minimum radial load, kN C = basic dynamic load rating, kN The weight of the components supported by the bearing, together with the external rolling forces, almost always exceed the requisite minimum load. If this is not the case an additional radial load must be applied.

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1 Product information
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2 Recommendations
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3 Product data
General bearing data

Comparative load ratings
For rolling mill applications, load ratings are often used which are not calculated according to ISO 281:1990 but by a different method based on a rating life of 90 million revolutions (500 r/min for 3 000 operating hours). As a direct comparison of these load ratings with ISO load ratings is not possible, even if they are converted for 1 million revolutions (ISO life definition) “comparative” load ratings calculated by the same non-ISO method are given in the product table. These comparative load ratings cannot be used to calculate ISO lives. For further information please refer to the SKF catalogue “Large bearings” or the “SKF Interactive Engineering Catalogue” on CD-ROM or online at www.skf.com.

Designations and suffixes
SKF four-row taper roller bearings are generally special bearings and are usually identified by a drawing number. The numbering system has undergone some changes over the years ( designation scheme next page). Bearings having a modified internal design compared with the original are identified by a suffix letter A, B or C or a combination of these letters, e.g. AB. The meaning of these suffixes is specific to the drawing number. Bearings to the SKF Explorer class specifications are identified by the suffix E and have inner and outer rings of case hardened steel as standard. The helical groove in the bore is also standard. Therefore, the relevant suffixes (HA1 and G) are not used for these bearings.

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1 Product information
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2 Recommendations
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3 Product data
Designation scheme

BT4

- 8089

EX1 /

C300

BT4B - 334106 BG / HA1 C300 VA901
Prefixes BT4 BT4B –

330870 BG
four-row taper roller bearing (current prefix) four-row taper roller bearing (earlier prefix) the bearing type is only defined by the drawing (old SKF system for special bearings)

Drawing No. 0(000) special bearing with outside diameter < 420 mm 8(000) special bearing with outside diameter ≥ 420 mm 328000 to 334999 special taper roller bearing Design – A, B, C E EX E(X)1 E(X)2 E(X)3 G Material – HA1 HA4 HE1

3

original (standard) design or combinations of these letters: modified internal design SKF Explorer bearing without spacer rings SKF Explorer bearing with spacer rings SKF Explorer bearings with seals of hydrogenated acrylonitrile butadiene rubber (HNBR), otherwise to VA901 specification SKF Explorer bearings with seals of hydrogenated acrylonitrile butadiene rubber (HNBR), otherwise to VA902 specification SKF Explorer bearings with seals of hydrogenated acrylonitrile butadiene rubber (HNBR), otherwise to VA903 specification helical groove in bearing bore

standard outer and inner rings of case hardened steel outer and inner rings and rollers of case hardened steel outer and inner rings of vacuum remelted steel

Internal clearance – standard C300 axial internal clearance, mean value 300 m C400 axial internal clearance, mean value 400 m etc. Seal design VA901 fluoro rubber (FPM) seals at both sides, sealing ring between inner rings, can be relubricated via outer ring VA902 fluoro rubber (FPM) seals at both sides, sealing ring between inner rings, cannot be relubricated VA903 as VA901 but without sealing ring between inner rings VA919 fluoro rubber (FPM) seals at both sides, can be relubricated via outer ring, inner rings without lubrication grooves in side faces, but with annular groove in bore and lubrication holes through guide flange VA941 fluoro rubber (FPM) seals at both sides, cannot be relubricated via outer ring, inner ring with lubrication grooves in inboard side faces and annular groove and lubrication holes at outboard side between inner rings

21

1 Product information
Page............. 3
T r4 r1 r2 B D D1 d d1 r3

2 Recommendations
Page............. 10

3 Product data
Four-row taper roller bearings d 260,350 – 355,000 mm

TQON/GW Dimensions d mm/in 260,350 10,2500 292,100 11,5000 304,800 12,0000 422,275 16,6250 422,275 16,6250 419,100 16,5000 495,300 19,5000 412,648 16,2460 422,275 16,6250 422,275 16,6250 447,675 17,6250 438,023 17,2450 469,900 18,5000 520,000 20,4724 533,400 21,0000 457,098 17,9960 457,098 17,9960 457,098 17,9960 469,900 18,5000 490,000 19,2913 317,500 12,5000 269,875 10,6250 269,875 10,6250 342,900 13,5000 266,700 10,5000 269,875 10,6250 269,875 10,6250 327,025 12,8750 254,000 10,000 342,900 13,5000 323,500 12,7362 301,625 11,8750 254,000 10,0000 254,000 10,0000 254,000 10,0000 260,350 10,2500 316,000 12,4409 314,325 12,3750 269,875 10,6250 269,875 10,6250 342,900 13,5000 266,700 10,5000 269,875 10,6250 269,875 10,6250 327,025 12,8750 247,650 9,7500 342,900 13,5000 323,500 12,7362 307,975 12,1250 254,000 10,0000 254,000 10,0000 254,000 10,0000 260,350 10,2500 316,000 12,4409 298 324 328 350 325 342 338 340 354 362 378 390 366 362 362 372 382 372 379 378 440 374 384 389 398 394 420 490 475 413 420 420 430 446 6,4 6,4 1 2 3,3 1,5 1,5 3,3 1,5 3,3 6 3,3 1,5 1 1 1,5 1,5 D T B d1 ≈ D1 ≈ r1,2 min

TQOSN/GWSI Mass Designation r3,4 min kg 3,3 3,3 6,4 6,4 3,3 3,3 3,3 3,3 3,3 3,3 6 3,3 3,3 3,3 3,3 3,3 3,3 165 125 105 245 100 105 – BT4B 331487 BG/HA1 BT4B 331968 BG/HA1 BT4-8057 G/HA1C300VA901 BT4-8061 G/HA1C400VA901 BT4-0004 G/HA1 330870 BG – TQON/GW TQON/GW TQOSN/GWSI TQOSN/GWSI TQON/GW TQON/GW TQOSN/GWSI TQON/GW TQON/GW TQOSN/WILS TQON/W TQON/GW TQON/GW TQOSN/GWSI Design

304,902 12,0040 317,500 12,5000

94,5 *BT4B 334023 E1/C675 165 105 185 240 240 110 110 105 125 170 BT4B 331161 BG/HA1 BT4B 331664 AG/HA1 BT4-8017/HA1C600VA941 BT4B 332963 B/HA1 BT4-8034 G/HA1 *330661 E/C475 *BT4B 328817 E1/C475

330,302 13,0040 333,375 13,1250 340,000 13,3858 342,900 13,5000 343,052 13,5060

BT4B 334106 BG/HA1C300VA901 TQOSN/GWSI BT4B 331077 BG/HA1 BT4-8020 G/HA1VA901 TQON/GW TQOSN/GWSI

347,662 13,6874 355,000 13,9764

* SKF Explorer bearing. Other bearings will be converted to the Explorer class continouosly. Please ask for availability of further SKF Explorer bearings.

22

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Page ............. 3

2 Recommendations
Page ............. 10

3 Product data

3
TQON/W Designation Basic load ratings dyn. stat. C – BT4B 331487 BG/HA1 BT4B 331968 BG/HA1 BT4-8057 G/HA1C300VA901 BT4-8061 G/HA1C400VA901 BT4-0004 G/HA1 330870 BG BT4B 334023 E1/C675 BT4B 331161 BG/HA1 BT4B 331664 AG/HA1 BT4-8017/HA1C600VA941 BT4B 332963 B/HA1 BT4-8034 G/HA1 330661 E/C475 BT4B 328817 E1/C475 BT4B 334106 BG/HA1C300VA901 BT4B 331077 BG/HA1 BT4-8020 G/HA1VA901 kN 4 460 3 800 2 920 5 120 3 190 3 360 3 250 4 730 2 810 4 130 5 610 4 730 3 450 3 350 2 550 3 910 4 460 8 000 8 000 6 700 9 300 7 500 8 150 6 550 10 800 7 350 10 200 10 400 8 800 6 800 6 400 6 000 8 500 10 000 C0 TQOSN/WILS Fatigue load limit Pu kN 710 680 585 780 640 680 570 880 600 830 880 720 570 540 510 695 830 Calculation factors e – 0,33 0,31 0,31 0,40 0,31 0,31 0,33 0,33 0,46 0,33 0,30 0,33 0,48 0,48 0,68 0,33 0,33 2 2,2 2,2 1,7 2,2 2,2 2 2 1,5 2 2,3 2 1,4 1,4 1 2 2 3 3,3 3,3 2,5 3,3 3,3 3 3 2,2 3 3,4 3 2,1 2,1 1,5 3 3 2 2,2 2,2 1,6 2,2 2,2 2 2 1,4 2 2,2 2 1,4 1,4 1 2 2 Y1 Y2 Y0 Comparative data Load ratings Thrust radial axial factor CF CFa K kN 1 100 930 710 1 250 780 815 695 1 160 680 1 000 1 370 1 160 735 710 610 950 1 080 179 142 110 245 122 129 114 193 154 165 194 190 171 166 210 153 177 – 1,76 1,87 1,85 1,47 1,83 1,83 1,76 1,74 1,27 1,76 2,01 1,76 1,24 1,23 0,84 1,76 1,75

23

1 Product information
Page ............. 3
T r4 r1 r2 B D D1 d d1 r3

2 Recommendations
Page ............. 10

3 Product data
Four-row taper roller bearings d 355,600 – 409,575 mm

TQON/GW Dimensions d mm/in 355,600 14,0000 482,600 19,0000 482,600 19,0000 488,950 19,2500 488,950 19,2500 540,000 21,2598 560,000 22,0472 546,100 21,5000 514,350 20,2500 546,100 21,5000 546,100 21,5000 546,100 21,5000 546,100 21,5000 546,100 21,5000 546,100 21,5000 546,100 21,5000 565,150 22,2500 409,575 16,1250 546,100 21,5000 546,100 21,5000 546,100 21,5000 269,875 10,6250 269,875 10,6250 317,500 12,5000 317,500 12,5000 325,000 12,7953 360,000 14,1732 400,050 15,7500 317,500 12,5000 288,925 11,3750 288,925 11,3750 288,925 11,3750 288,925 11,3750 288,925 11,3750 330,000 12,9921 330,000 12,9921 440,000 17,3228 334,962 13,1875 334,962 13,1875 334,962 13,1875 265,113 10,4375 265,113 10,4375 317,500 12,5000 317,500 12,5000 325,000 12,7953 390,000 15,3543 400,050 15,7500 317,500 12,5000 288,925 11,3750 288,925 11,3750 288,925 11,3750 288,925 11,3750 268,288 10,5625 330,000 12,9992 330,000 12,9992 440,000 17,3228 334,962 13,1875 334,962 13,1875 334,962 13,1875 382 380 392 382 398 417 416 411 434 434 434 434 434 434 438 436 434 434 438 432 436 448 446 485 500 496 471 494 498 498 498 494 498 498 508 498 498 490 1,5 1,5 1,5 1 1,5 3,3 3,3 1 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1 1 1,5 D T B d1 ≈ D1 ≈ r1,2 min

TQOSN/GWSI Mass Designation r3,4 min kg 3,3 3,3 3,3 3,3 3 5 6,4 3,3 6,4 6,4 6,4 6,4 6,4 6,4 6,4 6,4 6,4 6,4 6,4 140 134 180 170 250 300 300 175 186 180 180 185 180 200 225 340 205 205 220 – *330662 E/C480 *BT4B 328870 EX1/C480 331271 BG *BT4B 328912 E3/C675 BT4-8015 G/HA1 BT4-8033 G/HA1 BT4-8025 G/HA1C300VA903 BT4B 334042 BG/HA1VA901 *BT4B 330650 E/C500 BT4B 328838 BG/HA1VA901 BT4B 328838 BG/HA1VA902 BT4-8014 G/HA1VA901 331465 BG BT4B 334093 BG/HA1VA902 BT4B 334092 AG/HA1 BT4-8002 G/HA1 BT4-8021 G/HA1VA919 BT4B 329004 BG/HA1VA901 BT4B 331333 BG/HA1 – TQON/GW TQOSN/GWSI TQON/GW TQOSN/GW TQON/GW TQOEN/GW TQOSN/GW TQOSN/GWSI TQON/GW TQOSN/GWSI TQOSN/GWISI TQOSN/GWSI TQON/GW TQOSN/GWISI TQON/GW TQON/GW TQOSN/GWOY TQOSN/GWSI TQON/GW Design

360,000 14,1732 380,000 14,9606 384,175 15,1250 385,762 15,1875 406,400 16,0000

* SKF Explorer bearing. Other bearings will be converted to the Explorer class continouosly. Please ask for availability of further SKF Explorer bearings.

24

1 Product information
Page ............. 3

2 Recommendations
Page ............. 10

3 Product data

3
TQOSN/GWISI Designation Basic load ratings dyn. stat. C – 330662 E/C480 BT4B 328870 EX1/C480 331271 BG BT4B 328912 E3/C675 BT4-8015 G/HA1 BT4-8033 G/HA1 BT4-8025 G/HA1C300VA903 BT4B 334042 BG/HA1VA901 BT4B 330650 E/C500 BT4B 328838 BG/HA1VA901 BT4B 328838 BG/HA1VA902 BT4-8014 G/HA1VA901 331465 BG BT4B 334093 BG/HA1VA902 BT4B 334092 AG/HA1 BT4-8002 G/HA1 BT4-8021 G/HA1VA919 BT4B 329004 BG/HA1VA901 BT4B 331333 BG/HA1 kN 4 000 3 550 4 460 5 100 5 720 6 710 6 160 4 180 5 000 4 180 4 180 3 300 4 180 4 400 5 010 7 650 4 840 4 840 5 010 8 000 7 500 11 000 10 000 10 800 13 700 15 000 10 000 10 200 9 500 9 500 7 800 9 500 10 200 13 200 18 600 12 000 12 000 13 200 C0 TQOEN/GW Fatigue load limit Pu kN 655 630 880 830 900 1 080 1 180 780 815 750 750 655 750 815 1 000 1 430 950 950 1 000 Calculation factors e – 0,48 0,46 0,33 0,33 0,30 0,40 0,35 0,40 0,48 0,48 0,48 0,68 0,48 0,48 0,43 0,33 0,40 0,40 0,43 1,4 1,5 2 2 2,3 1,7 1,9 1,7 1,4 1,4 1,4 1 1,4 1,4 1,6 2 1,7 1,7 1,6 2,1 2,2 3 3 3,4 2,5 2,9 2,5 2,1 2,1 2,1 1,5 2,1 2,1 2,3 3 2,5 2,5 2,3 1,4 1,4 2 2 2,2 1,6 1,8 1,6 1,4 1,4 1,4 1 1,4 1,4 1,6 2 1,6 1,6 1,6 Y1 Y2 Y0 Comparative data Load ratings Thrust radial axial factor CF CFa K kN 850 815 1 080 1 080 1 400 1 630 1 500 1 020 1 080 1 020 1 020 800 1 020 1 080 1 220 1 900 1 200 1 200 1 220 198 187 179 177 207 330 256 195 252 238 238 276 238 252 254 302 231 231 254 – 1,24 1,24 1,76 1,75 1,93 1,40 1,68 1,49 1,23 1,22 1,22 0,84 1,22 1,23 1,40 1,82 1,47 1,47 1,40

25

1 Product information
Page ............. 3
T r4 r1 r2 B D D1 d d1 r3

2 Recommendations
Page ............. 10

3 Product data
Four-row taper roller bearingsr d 420,000 – 475,000 mm

TQON/GW Dimensions d mm/in 420,000 16,5354 430,000 16,9291 574,000 22,5984 570,000 22,4409 575,000 22,6378 640,000 25,1969 571,500 22,5000 571,500 22,5000 571,500 22,5000 590,000 23,2283 635,000 25,0000 595,000 23,4252 595,000 23,4252 595,000 23,4252 595,000 23,4252 596,900 23,5000 596,900 23,5000 610,000 24,0157 600,000 23,6220 640,000 25,1968 480,000 18,8976 380,000 14,9606 380,000 14,9606 465,000 18,3071 279,400 11,0000 336,550 13,2500 336,550 13,2500 480,000 18,8976 463,500 18,2480 368,000 14,4882 368,000 14,4882 404,000 15,9055 415,000 16,3386 279,400 11,0000 279,400 11,0000 360,000 14,1732 368,000 14,4882 360,000 14,1732 480,000 18,8976 380,000 14,9606 380,000 14,9606 465,000 18,3071 279,400 11,0000 336,550 13,2500 336,550 13,2500 480,000 18,8976 463,500 18,2480 368,000 14,4882 368,000 14,4882 404,000 15,9055 415,000 16,3386 276,225 10,8750 276,225 10,8750 360,000 14,1732 368,000 14,4882 360,000 14,1732 450 458 458 486 458 458 458 468 488 484 486 480 478 484 484 479 500 512 530 510 518 578 530 516 530 539 588 550 542 545 544 550 550 565 554 568 2,5 2 1,5 2,5 1,5 1,5 1,5 1 3,3 3 3 2 1,5 1,5 1,5 3 2 2 5 5 5 4 3,3 3,3 3,3 5 6,4 6 6 6 6 3,3 3,3 6 6 6 D T B d1 ≈ D1 ≈ r1,2 min r3,4 min

TQON.1/GW Mass Designation Design

kg 345 260 280 530 185 240 215 365 470 265 285 305 320 190 190 290 250 335

– BT4-8018 G/HA1VA9011) BT4-8049 G/HA1 BT4-8006 BG/HA1 BT4-8040 G/HA4 BT4-8019 G/HA1VA901 BT4B 331226 BG/HA1 BT4-8003 G/HA1VA902 BT4B 334055 ABG/HA1VA9021) BT4-8039 G/HA1VA901 BT4-8023 G/HA1VA919 *BT4B 332773 E/C725 BT4-8044 G/HA1VA902 BT4-8024 G/HA1 BT4B 328827 ABG/HA1VA902 *BT4B 328827 E2/C500 *BT4B 331977 E/C725 BT4B 328913 BG/HA1C555 BT4-8035 G/HA1
1)

– TQOSN/GWSI TQON/GW TQON/GW TQON.1/GW TQOSN/GWSI TQON/GW TQOSN/GWISI TQOSN/GWISI TQOSN/GWSI TQOSN/GWOY TQON/GW TQOSN/GWISI TQON/GW TQOSN/GWISI TQOSN/GWISI TQON/GW TQON/GW TQON/GW

431,800 17,000

440,000 17,3228 447,600 17,6220 450,000 17,7165

457,200 18,0000

460,000 18,1102 475,000 18,7008

* SKF Explorer bearing. Other bearings will be converted to the Explorer class continouosly. Please ask for availability of further SKF Explorer bearings. 1) Non-standard inner ring width tolerance

26

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Page ............. 3

2 Recommendations
Page ............. 10

3 Product data

3
TQOSN/GWSI Designation Basic load ratings dyn. stat. C – BT4-8018 G/HA1VA901 BT4-8049 G/HA1 BT4-8006 BG/HA1 BT-8040 G/HA4 BT4-8019 G/HA1VA901 BT4B 331226 BG/HA1 BT4-8003 G/HA1VA902 BT4B 334055 ABG/HA1VA902 BT4-8039 G/HA1VA901 BT4-8023 G/HA1VA919 BT4B 332773 E/C725 BT4-8044 G/HA1VA902 BT4-8024 G/HA1 BT4B 328827 ABG/HA1VA902 BT4B 328827 E2/C500 BT4B 331977 E/C725 BT4B 328913 BG/HA1C555 BT4-8035 G/HA1 kN 7 210 5 280 6 440 9 520 3 740 5 280 4 840 7 650 7 650 5 280 6 800 5 940 7 040 4 290 4 900 7 500 5 720 5 500 18 600 14 000 16 600 21 200 9 000 14 000 12 700 20 000 20 000 13 700 16 300 16 300 19 000 10 000 10 000 16 300 16 600 15 300 C0 TQOSN/GWISI Fatigue load limit Pu kN 1 430 1 060 1 250 1 560 735 1 060 980 1 460 1 460 1 040 1 220 1 220 1 400 780 780 1 250 1 250 1 120 Calculation factors e – 0,31 0,44 0,40 0,26 0,54 0,44 0,44 0,28 0,33 0,31 0,33 0,33 0,31 0,48 0,48 0,33 0,30 0,33 2,2 1,5 1,7 2,6 1,25 1,5 1,5 2,4 2 2,2 2 2 2,2 1,4 1,4 2 2,3 2 3,3 2,3 2,5 3,9 1,8 2,3 2,3 3,6 3 3,3 3 3 3,3 2,1 2,1 3 3,4 3 2,2 1,4 1,6 2,5 1,3 1,4 1,4 2,5 2 2,2 2 2 2,2 1,4 1,4 2 2,2 2 Y1 Y2 Y0 Comparative data Load ratings Thrust radial axial factor CF CFa K kN 1 760 1 290 1 560 2 360 915 1 290 1 180 1 860 1 900 1 290 1 460 1 460 1 730 1 040 1 040 1 600 1 400 1 340 279 282 315 308 243 282 254 255 313 206 236 236 267 242 242 259 200 222 – 1,83 1,33 1,43 2,21 1,07 1,33 1,34 2,12 1,76 1,82 1,76 1,76 1,87 1,24 1,24 1,76 2,03 1,76

27

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T r4 r1 r2 B D D1 d d1 r3

2 Recommendations
Page ............. 10

3 Product data
Four-row taper roller bearings d 479,425 – 540,000 mm

TQON/GW Dimensions d mm/in 479,425 18,8750 679,450 26,7500 679,450 26,7500 615,950 24,2500 615,950 24,2500 615,950 24,2500 615,950 24,2500 615,950 24,2500 615,950 24,2500 615,950 24,2500 635,000 25,0000 489,026 19,2530 634,873 24,9950 634,873 24,9950 711,200 28,0000 655,000 25,7874 673,100 26,5000 673,100 26,5000 680,000 26,7717 690,000 27,1654 690,000 27,1654 495,300 19,5000 495,300 19,5000 330,200 13,0000 330,200 13,0000 330,200 13,0000 330,200 13,0000 330,200 13,0000 330,200 13,0000 420,000 16,5354 421,000 16,5748 320,675 12,6250 320,675 12,6250 520,700 20,5000 379,000 14,9213 422,275 16,6250 422,275 16,6250 440,000 17,3228 400,000 15,7480 440,000 17,3228 495,300 19,5000 495,300 19,5000 330,200 13,0000 330,200 13,0000 330,200 13,0000 419,100 16,5000 419,100 16,5000 419,100 16,5000 420,000 16,5354 421,000 16,5748 320,675 12,6250 320,675 12,6250 520,700 20,5000 377,000 14,8425 422,275 16,6250 422,275 16,6250 440,000 17,3228 400,000 15,7480 440,000 17,3228 520 520 512 505 505 505 505 512 505 512 522 516 550 539 537 545 558 568 565 610 610 570 577 577 577 577 570 577 578 584 588 655 602 606 614 624 635 636 3,3 3,3 3,3 1 1 1 1 3,5 2,8 3 3,3 2,5 3,3 1,5 3,3 3,3 1,5 2 2 D T B d1 ≈ D1 ≈ r1,2 min

TQOSN/GWSI Mass Designation r3,4 min kg 6,4 6,4 6,4 6,4 6,4 6,4 6,4 6,4 4,4 6,4 3,3 3,3 6,4 6,4 6,4 6,4 3 5 5 585 565 240 233 233 240 240 250 280 365 267 240 610 323 395 405 405 364 395 – BT4B 330886 CG/HA1 BT4B 334116 BG/HA1VA901 *330641 E/C725 *BT4B 328842 E1/C725 *BT4B 328842 E2/C725 BT4B 334072 BG/HA1VA901 BT4B 334072 BG/HA1VA903 BT4B 331626 BG/HA1 BT4-8062 G/HA1VA901 BT4B 334105 BG/HA1 *331090 E/C700 BT4B 334014 AAG/HA1VA901 BT4-8059 G/HA1VA901 *BT4B 331747 E/C775 BT4-8045 G/HA1VA901 331157 BG BT4-8043 G/HA1 *BT4-8108 E/C625 BT4-8038 G/HA1VA901 – TQON/GW TQOSN/GWSI TQON/GW TQOSN/GWSI TQOSN/GWISI TQOESN/GWSI TQOESN/GW TQOEN/GW TQOSN/GWSI TQON/GW TQON/GW TQOSN/GWSI TQOSN/GWSI TQON/GW TQOSN/GWSI TQON/GW TQON/GW TQON/GW TQOSN/GWSI Design

482,600 19,0000

501,650 19,7500 510,000 20,9787 514,350 20,2500

530,000 20,8661 540,000 21,2598

* SKF Explorer bearing. Other bearings will be converted to the Explorer class continouosly. Please ask for availability of further SKF Explorer bearings.

28

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Page ............. 3

2 Recommendations
Page ............. 10

3 Product data

3
TQOEN/GW Designation Basic load ratings dyn. stat. C – BT4B 330866 CG/HA1 BT4B 334116 BG/HA1VA901 330641 E/C725 BT4B 328842 E1/C725 BT4B 328842 E2/C725 BT4B 334072 BG/HA1VA901 BT4B 334972 BG/HA1VA903 BT4B 331626 BG/HA1 BT4-8062 G/HA1VA901 BT4B 334105 BG/HA1 331090 E/C700 BT4B 334014 AAG/HA1C300VA901 BT4-8059 G/HA1VA901 BT4B 331747 E/C775 BT4-8045 G/HA1VA901 331157 BG BT4-8043 G/HA1 BT4-8108 E/C625 BT4-8038 G/HA1VA901 kN 10 100 9 350 6 300 6 100 6 100 5 280 5 280 5 500 5 500 7 370 6 300 5 230 8 090 7 800 6 820 7 810 8 250 8 150 7 480 25 500 22 400 15 300 13 700 13 700 13 700 13 700 15 300 15 300 20 400 14 600 12 500 19 600 19 000 19 000 21 600 23 600 19 300 21 200 C0 TQOESN/GWSI Fatigue load limit Pu kN 1 830 1 660 1 120 1 060 1 060 1 060 1 060 1 120 1 120 1 460 1 080 950 1 460 1 370 1 370 1 560 1 630 1 400 1 500 Calculation factors e – 0,33 0,33 0,33 0,33 0,33 0,33 0,33 0,33 0,33 0,33 0,35 0,37 0,33 0,33 0,33 0,31 0,33 0,4 0,33 2 2 2 2 2 2 2 2 2 2 1,9 1,8 2 2 2 2,2 2 1,7 2 3 3 3 3 3 3 3 3 3 3 2,9 2,7 3 3 3 3,3 3 2,5 3 2 2 2 2 2 2 2 2 2 2 1,8 1,8 2 2 2 2,2 2 1,6 2 Y1 Y2 Y0 Comparative data Load ratings Thrust radial axial factor CF CFa K kN 2 500 2 280 1 340 1 290 1 290 1 290 1 290 1 340 1 340 1 800 1 340 1 270 2 000 1 660 1 660 1 930 2 040 1 730 1 860 409 372 222 213 213 213 213 222 222 295 224 234 324 273 273 301 321 345 301 – 1,76 1,76 1,76 1,76 1,76 1,76 1,76 1,76 1,76 1,76 1,70 1,54 1,76 1,76 1,76 1,83 1,82 1,45 1,76

29

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T r4 r1 r2 B D D1 d d1 r3

2 Recommendations
Page ............. 10

3 Product data
Four-row taper roller bearings d 558,800 – 685,800 mm

TQON/GW Dimensions d mm/in 558,800 22,0000 736,600 29,0000 736,600 29,0000 730,250 28,7500 771,525 30,3750 844,550 33,2500 787,400 31,0000 800,000 31,4961 815,000 32,0866 1 040,000 40,9449 1 040,000 40,9449 409,575 16,1250 457,200 18,0000 349,250 13,7500 479,425 18,8750 615,950 24,2500 361,950 14,2500 363,500 14,3110 480,000 18,8976 610,000 24,0157 610,000 24,0157 409,575 16,1250 455,612 17,9375 342,900 13,5000 479,425 18,8750 615,950 24,2500 361,950 14,2500 363,500 14,3110 480,000 18,8976 610,000 24,0157 610,000 24,0157 648,000 25,5118 365,125 14,3750 365,125 14,3750 552,450 21,7500 352,425 13,8750 352,425 13,8750 352,425 13,8750 594 591 601 622 642 645 655 656 740 730 760 698 692 722 730 730 730 672 666 678 704 754 735 740 746 905 905 960 756 784 824 805 818 818 3,3 3,3 1,5 3,3 3,3 3,3 2 3,2 15 15 6 3,3 2 3,3 3,3 3,3 3,3 D T B d1 ≈ D1 ≈ r1,2 min

TQOSN/GWSI Mass Designation r3,4 min kg 6,4 6,4 3,3 6,4 6,4 6,4 6 6,5 10 10 10 6,4 6,4 6,4 6,4 6,4 6,4 480 515 327 620 – BT4B 330993 AG/HA1 BT4-8022 G/HA1VA919 *BT4B 331189 E/C600 BT4B 331093 BG/HA1 – TQON/GW TQOSN/GWOY TQON/GW TQON/GW TQON/GW TQOSN/GWISI TQOSN/GWISI TQON/GW TQON/GW TQOSN/GWSI TQOSN.1/GWSI TQON/GW TQOSN/GWSI TQOSN/GWSI TQON/GW TQOSN/GWISI TQOSN/GWISI Design

584,200 23,0000 585,788 23,0625 595,312 23,4375 609,600 24,0000 620,000 24,4094 625,000 24,6063 650,000 25,5906

1 180 *BT4B 331300 E/C775 425 440 660 BT4-8054 G/HA1VA902 BT4-8055 G/HA1VA902 *BT4-8031 E/C800

1 970 BT4-8036 G/HA1 1 970 BT4-8037 G/HA1VA901 2 260 BT4-8060 G/HA4C300VA901 415 395 970 525 505 505 BT4B 331190 BG/HA1 BT4B 328977 BG/HA1VA901 BT4B 334015 BG/HA1VA901 BT4B 331089 CG/HA1 BT4B 328955 ABG/HA1VA902 BT4B 328955 BG/HA1VA901

660,000 25,9843 660,400 26,0000

1 070,000 648,000 42,1260 25,5118 812,800 32,0000 812,800 32,0000 901,700 35,5000 876,000 34,5000 876,300 34,5000 876,300 34,5000 365,125 14,3750 365,125 14,3750 552,450 21,7500 355,600 14,0000 355,600 14,0000 355,600 14,0000

679,450 26,7500 685,800 27,0000

* SKF Explorer bearing. Other bearings will be converted to the Explorer class continouosly. Please ask for availability of further SKF Explorer bearings.

30

1 Product information
Page ............. 3

2 Recommendations
Page ............. 10

3 Product data

3
TQOSN/GWISI Designation Basic load ratings dyn. stat. C – BT4B 330993 AG/HA1 BT4-8022 G/HA1VA919 BT4B 331189 E/C600 BT4B 331093 BG/HA1 BT4B 331300 E/C775 BT4-8054 G/HA1VA902 BT4-8055 G/HA1VA902 BT4-8031 E/C800 BT4-8036 G/HA1 BT4-8037 G/HA1VA901 BT4-8060 G/HA4C300VA901 BT4B 331190 BG/HA1 BT4B 328977 BG/HA1VA901 BT4B 334015 BG/HA1VA901 BT4B 331089 CG/HA1 BT4B 328955 ABG/HA1VA902 BT4B 328955 BG/HA1VA902 kN 8 250 8 580 6 800 10 600 17 300 7 370 7 040 13 200 17 600 17 600 19 000 7 210 7 210 13 200 7 810 7 650 7 650 22 000 23 200 17 000 30 000 39 000 18 600 18 000 31 000 36 500 36 500 38 000 22 400 20 400 36 000 22 000 20 000 20 000 C0 TQOSN/GWOY Fatigue load limit Pu kN 1 560 1 630 1 200 2 040 2 550 1 370 1 320 2 120 2 500 2 500 2 500 1 530 1 430 2 400 1 500 1 400 1 400 Calculation factors e – 0,35 0,35 0,43 0,33 0,33 0,37 0,37 0,33 0,31 0,31 0,31 0,33 0,33 0,33 0,43 0,37 0,37 1,9 1,9 1,6 2 2 1,8 1,8 2 2,2 2,2 2,2 2 2 2 1,6 1,8 1,8 2,9 2,9 2,3 3 3 2,7 2,7 3 3,3 3,3 3,3 3 3 3 2,3 2,7 2,7 1,8 1,8 1,6 2 2 1,8 1,8 2 2,2 2,2 2,2 2 2 2 1,6 1,8 1,8 Y1 Y2 Y0 Comparative data Load ratings Thrust radial axial factor CF CFa K kN 2 040 2 120 1 460 2 650 3 750 1 800 1 730 2 850 4 400 4 400 4 750 1 760 1 730 3 250 1 900 1 860 1 860 346 355 305 426 602 323 314 468 679 679 749 284 284 528 393 333 333 – 1,69 1,69 1,36 1,76 1,76 1,58 1,56 1,74 1,84 1,84 1,83 1,76 1,76 1,76 1,40 1,62 1,62

31

1 Product information
Page ............. 3
T r4 r1 r2 B D D1 d d1 r3

2 Recommendations
Page ............. 10

3 Product data
Four-row taper roller bearings d 710,000 – 1 346,200 mm

TQON/GW Dimensions d mm/in 710,000 27,9528 750,000 29,5276 762,000 30,0000 900,000 35,4331 950,000 37,4016 410,000 16,1417 410,000 16,1417 410,000 16,1417 410,000 16,1417 723,900 28,5000 750 800 825 835 878 952 3 3 8,9 6 6 12,7 12 D T B d1 ≈ D1 ≈ r1,2 min r3,4 min

TQON.1/GW Mass Designation Design

kg 620 705

– BT4B 331351 BG/HA1 *BT4-8048 E/C725

– TQON/GW TQON/GW TQON.1/GW TQON.1/GW

1 066,800 736,600 42,0000 29,0000

2 090 BT4B 331907 BG/HA4 6 980 BT4-8042 G/HA4

1 346,200 1 729,740 1 143,000 1 143,000 1 415 1 580 5 53,0000 68,1000 45,0000 45,0000

* SKF Explorer bearing. Other bearings will be converted to the Explorer class continouosly. Please ask for availability of further SKF Explorer bearings.

32

1 Product information
Page ............. 3

2 Recommendations
Page ............. 10

3 Product data

3

Designation

Basic load ratings dyn. stat. C C0

Fatigue load limit Pu kN

Calculation factors e – 0,35 0,37 0,33 0,31 1,9 1,8 2 2,2 2,9 2,7 3 3,3 1,8 1,8 2 2,2 Y1 Y2 Y0

Comparative data Load ratings Thrust radial axial factor CF CFa K kN 2 360 2 280 5 500 12 200 404 415 909 1 940 – 1,66 1,58 1,76 1,83

– BT4B 331351 BG/HA1 BT4-8048 E/C725 BT4B 331907 BG/HA4 BT4-8042 G/HA4

kN 9 680 10 800 22 000 49 500 27 000 26 500 58 500 163 000

1 800 1 730 3 600 8 300

33

Other SKF products
CR radial shaft seals and V-rings
The environmental conditions in rolling mills are very unfavourable where bearings are concerned, as there are considerable quantities of water, emulsion and solid contaminants, e.g. scale. This means that both the open and sealed bearings must be protected in the chocks by reliable external seals. SKF has a comprehensive range of large radial shaft seals and V-rings covering all the designs required for this external sealing. Radial shaft seals of the HDS1 and HDS2 designs( figs 1 and 2 ) are particularly recommended for use in rolling mills. They are suitable for difficult sealing positions under arduous conditions and are resistant to wear and corrosion. These seals are characterized by their robust shell that covers three sides of the seal body, effectively protecting the spring-loaded sealing lip from mechanical damage. The HDS3 design ( figs 3 and 4 ) incorporates spacer lugs on the seal face. These enable two or more such seals to be mounted in tandem at a given distance from each other, or can be useful when positioning the seal at the correct distance in the housing bore. Detailed information on radial shaft seals and V-rings will be found in the SKF catalogue “CR seals” and the “SKF Interactive Engineering Catalogue” on CD-ROM or online at www.skf.com.

34

Fig 1

CR shaft repair sleeves
The design and finish of the counterface (the surface on which the sealing lip runs) are very important for the correct performance of shaft seals. Where possible the counterface should be hardened and finished. Excessive lip pressure and the presence of solid contaminants have a negative influence on sealing efficiency and may lead to tracks being worn in the counterface. In such cases it is not sufficient just to replace the seal to restore sealing efficiency. The counterface must be reworked and this is generally expensive and time-consuming. Where repairs to the counterface are necessary CR shaft repair sleeves ( fig 5 ) are the ideal solution. They are simply pressed on to the shaft and provide a new counterface. The sleeves for shaft diameters of 200 to 1 250 mm have a wall thickness of 2,4 mm and are made of high quality hot rolled steel with a hardness of 96 HRB. The counterface for the seal is finely finished and chromium plated to enhance its resistance to wear and corrosion. The Fig 4 sleeves are available either with a flange, the LDSLV3 design, or without a flange, the LDSLV4 design. There are two alternative ways

Radial shaft seal of the HDS1 design Fig 2

Radial shaft seal of the HDS2 design Fig 3

of using these LDSLV sleeves. The first is simply to push the sleeve into position over the damaged counterface and to use a seal which has a 4,8 mm larger bore diameter than the original ( fig 6 ). The second is to machine down the diameter of the worn counterface by 4,8 mm and use the same size of seal as the original ( fig 6 ). In cases where seal wear and damage to the counterface can be expected it is recommended that an LDSLV sleeve is incorporated into the original design. It is not then necessary to rework and one and the same seal size can be used throughout. More information on these shaft repair sleeves will be found in the SKF catalogue “CR seals” or the “SKF Interactive Engineering Catalogue” on CD-ROM or online at www.skf.com.

Radial shaft seal with spacer lugs, HDS3 design

HDS design radial shaft seals mounted adjacent to each other

CR shaft repair sleeve with flange, LDSLV3 design, and without flange, LDSLV 4 design Fig 5

Alternative ways to repair shafts using LDSLV sleeves Fig 6

Alternative 2: Original seal Shaft diameter = d1 – 2 × 2,4 mm Original shaft diameter d1 Alternative 1: Original shaft diameter Replacement seal bore diameter = d1 + 2 × 2,4 mm

35

SKF lubricating greases
In the vast majority of applications, SKF four-row taper roller bearings are lubricated with grease. For the open and sealed bearings on work rolls it is recommended to use the SKF grease LGHB 2, see specification below. The grease is a high quality calcium sulphonate complex grease. The base oil is a mineral oil. The special characteristics of this grease are its excellent lubricating properties even under heavy loads, friction-reducing and anti-wear properties, extremely good mechanical stability, very good resistance to water, and extremely good corrosion inhibiting properties. The development of SKF lubricating greases has been based on extensive research efforts, testing and practical experience and has been undertaken specifically with bearing lubrication in mind. The strict specifications are designed to allow long bearing life. This means that the user can be assured of obtaining the best bearing greases of consistently high quality from SKF worldwide. It also means products, which are environmentally favourable as for the most part toxic heavy metal compounds have been replaced.

Consistency, NLGI Scale Soap base Colour Base oil Temperature range °C Dropping point (ISO 2176) °C Base oil viscosity at 40 °C, mm2/s at 100 °C, mm2/s Penetration (ISO 2137) 60 strokes, 10–1 mm difference after 100 000 strokes, 10–1 mm Roll stability 72 h at 100 °C (DIN 51804), 10–1 mm Corrosion protection SKF Emcor test standard ISO 11007 water wash-out test salt water test Water resistance DIN 51 807/1, 3 h at 90 °C Oil separation DIN 51 817, 7 days at 40 °C, static, % Copper corrosion DIN 51 811, 100 °C EP performance 4-ball test, welding load (DIN 51 350/4), N

2 complex calcium sulphonate brown mineral oil –20 to +150 min. 220 400 to 450 26,5 265 to 295 –20 to +50 (max. 325) –20 to +50 (change) 0-0 0-0 0-0 max. 1 1 to 3 max. 2 min. 3 000

SKF lubricating grease LGHB 2: Technical data

For full information on SKF greases please refer to the SKF catalogue “SKF Maintenance and Lubrication Products” which will be sent on request.

36

37

SKF – The knowledge engineering company
The business of the SKF Group consists of the design, manufacture and marketing of the world’s leading brand of rolling bearings, with a global leadership position in complementary products such as radial seals. SKF also holds an increasingly important position in the market for linear motion products, high precision aerospace bearings, machine tool spindles, plant maintenance services and is an established producer of high-quality bearing steel. The SKF Group maintains specialized businesses to meet the needs of the global marketplace. SKF supports specific market segments with ongoing research and development efforts that have led to a growing number of innovations, new standards and new products. SKF Group has global ISO 14001 environmental certification. Individual divisions have been approved for quality certification in accordance with either ISO 9000 or appropriate industry specific standards. Some 80 manufacturing sites worldwide and sales companies in 70 countries make SKF a truly international corporation. In addition, our 7 000 distributor and dealer partners around the world, e-business marketplace and global distribution system put SKF close to customers for the supply of both products and services. In essence, SKF solutions are available wherever and whenever our customers need them. Overall, the SKF brand now stands for more than ever before. It stands for the knowledge engineering company ready to serve you with worldclass product competences, intellectual resources and the vision to help you succeed.
Developing a cleaner cleaner The electric motor and its bearings are the heart of many household appliances. SKF works closely with appliance manufacturers to improve their product’s performance, cut costs and reduce weight. A recent

Harnessing wind power The growing industry of wind-generated electric power provides an environmentally compatible source of electricity. SKF is working closely with global industry leaders to develop efficient and trouble-free turbines, using SKF knowledge to provide highly specialized bearings and condition monitoring systems to extend equipment life in the extreme and often remote environments of wind farms.

example produced a new generation of vacuum cleaners with substantially more suction. SKF’s knowledge in small bearing technology is also applied to manufacturers of power tools and office equipment.

Delivering asset efficiency optimization To optimize efficiency and boost productivity, many industrial facilities outsource some or all of their maintenance services to SKF, often with guaranteed performance contracts. Through the specialized capabilities and knowledge available from

SKF Reliability Systems, SKF provides a comprehensive range of asset efficiency services, from maintenance strategies and engineering assistance, to operatordriven reliability and machine maintenance programs.

38

Creating a new “cold remedy” In the frigid winters of northern China, sub-zero temperatures can cause rail car wheel assemblies and their bearings to seize due to lubrication starvation. SKF created a new family of synthetic lubricants formulated to retain their lubrication viscosity even at these extreme bearing temperatures. SKF’s knowledge of lubricants and friction are unmatched through out the world.

Evolving by-wire technology SKF has unique expertize and knowledge in fast growing by-wire technology, from fly-by-wire, to drive-by-wire, to work-bywire. SKF pioneered practical fly-by-wire technology and is a close working partner with all aerospace industry leaders. As an example, virtually all aircraft of the Airbus design use SKF by-wire systems for cockpit flight control. SKF is also a leader in automotive drive-by-wire,

having jointly developed the revolutionary Filo and Novanta concept cars which employ SKF mechatronics for steering and braking. Further by-wire development has led SKF to produce an allelectric forklift truck which uses mechatronics rather than hydraulics for all controls.

Planning for sustainable growth By their very nature, bearings make a positive contribution to the natural environment. Reduced friction enables machinery to operate more efficiently, consume less power and require less lubrication. SKF is continually raising the performance bar, enabling new generations of high-efficiency products and equipment. With an eye to the future, SKF’s global policies and manufacturing techniques are planned and implemented to help protect and preserve the earth’s limited natural resources. We remain committed to sustainable, environmentally responsible growth.

Maintaining a 320 km/h R&D lab In addition to SKF’s renowned research and development facilities in Europe and the United States, Formula One car racing provides a unique environment for SKF to push the limits of bearing technology. For over 50 years, SKF products, engineering and knowledge have helped

make Scuderia Ferrari a formidable force in F1 racing. (The average racing Ferrari utilizes more than 150 SKF components.) Lessons learned here are applied to the products we provide to automakers and the aftermarket worldwide.

39

R

SKF is a registered trademark of the SKF Group. Copyright SKF 2003 The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless permission is granted. Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein. Publication 5109 E August 2003

Printed in Germany on environmentally friendly, chlorine-free paper by Weppert GmbH & Co. KG.

www.skf.com


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