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SKF high-capacity cylindrical roller bearings

SKF high - capacity cylindrical roller bearings Full complement bearings with a cage Higher load ratings and longer service life Applications like industrial gearboxes, gear- However, direct roller -to- roller contact in a boxes in wind turbines or machines for min- full complement bearing increases friction, ing equipment require components that can heat generation and the risk for wear. Con- provide high operational reliability and long sequently, the permissible speed is reduced. service life. In these applications, load carry- Under particularly difficult operating condi- ing capacity is particularly important, which tions, these disadvantages quickly add up to is the reason why full complement bearings substantially reduced bearing service life. are frequently used. To achieve the maximum load carrying Full complement bearings do not have a capacity of a full complement bearing and cage separating the rollers, which enables the robust performance of a bearing with a a maximum number of rollers.

Performance advantage Optimized cage design The key to the new SKF high-capacity cylindrical roller bearing lies in its new cage design. The design of this steel cage goes

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  High, Bearing, Capacity, Roller, Cylindrical, Optimized, Skf high capacity cylindrical roller bearings, Skf high capacity cylindrical roller

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Transcription of SKF high-capacity cylindrical roller bearings

1 SKF high - capacity cylindrical roller bearings Full complement bearings with a cage Higher load ratings and longer service life Applications like industrial gearboxes, gear- However, direct roller -to- roller contact in a boxes in wind turbines or machines for min- full complement bearing increases friction, ing equipment require components that can heat generation and the risk for wear. Con- provide high operational reliability and long sequently, the permissible speed is reduced. service life. In these applications, load carry- Under particularly difficult operating condi- ing capacity is particularly important, which tions, these disadvantages quickly add up to is the reason why full complement bearings substantially reduced bearing service life. are frequently used. To achieve the maximum load carrying Full complement bearings do not have a capacity of a full complement bearing and cage separating the rollers, which enables the robust performance of a bearing with a a maximum number of rollers.

2 Cage, SKF developed high - capacity cylindrical Therefore, the advantage of full comple- roller bearings . These bearings combine the ment bearings is that they can accommo- advantages of both bearing types. date much heavier loads than same-sized bearings with a cage. SKF high - capacity cylindrical roller bearings with an inner ring or outer ring shoulder-guided cage 2. An innovative bearing design Traditionally, higher load carrying capacities below the recommended minimum radial Fig. 1. have been achieved by incorporating larger load, the sliding ratio for these bearings with rollers. However, to do this within the ISO an inner ring shoulder-guided cage is sig- standardized boundary dimensions requires nificantly lower than for conventional cylin- thinner rings. Thinner rings increase the risk drical roller bearings with a cage of the of ring creep, ring or flange cracks, and fret- same size.

3 For bearings in the 22 dimension ting corrosion. Also, larger rollers are more series, the risk for sliding damage is even prone to smearing due to increased inertial more reduced than for 23 series bearings . forces. 22 series bearings have a lower cross sec- The new SKF high - capacity cylindrical tion and smaller rollers, which results in roller bearings ( fig. 1), which contain lower inertial forces. more rollers than EC design cylindrical roller The rollers are coated with black oxide bearings , not only maintain the original ISO to further reduce the risk of sliding damage boundary dimensions, they also maintain inside the bearing during initial start-up. the internal geometry of the EC design. The Cross section of an SKF high - capacity result: increased dynamic and static load cylindrical roller bearing carrying capacities and consequently longer A sustainable product bearing service life.

4 SKF high - capacity cylindrical roller bearings were designed to support SKF's Beyond Reduced risk of roller Zero sustainability efforts. Through this sliding initiative, SKF is committed to creating products that consume less energy when SKF high - capacity cylindrical roller bearings in use than the energy needed to manufac- are specially designed to accommodate the ture them. requirements of wind turbines and applica- From an environmental standpoint, these tions where high load carrying capacity is bearings can provide the following benefits: a prerequisite. In these applications bearings must frequently operate below the requisite lower frictional losses minimum load. Under these conditions, the possibility for downsizing inertial forces of the rollers and cage, and increased bearing service life the friction in the lubricant, can have a det- rimental effect on the rolling conditions in The components of SKF high - capacity the bearing arrange ment and may cause cylindrical roller bearings are all made damaging sliding movement between the of steel, enabling easy recycling.

5 Rollers and raceways. With the inner ring shoulder-guided cage of SKF high - capacity cylindrical roller bear- ings, this risk is reduced. When operating 3. Performance advantage optimized cage design Fig. 2. The key to the new SKF high - capacity cylindrical roller bearing lies in its new cage design. The design of this steel cage goes beyond the design of traditional machined brass cages. The new window-type steel cage is de- signed so that its cage bars are displaced relative to the roller pitch diameter. This does not have an unfavourable effect on the strength of the cage bars, but enables the rollers to be placed closer to each other, cre- with an inner ring shoulder-guided cage with an outer ring shoulder-guided cage ating room for additional rollers. Advanced modelling techniques have SKF high - capacity cylindrical roller bearings with been used to optimize the cage design. an inner ring and outer ring shoulder-guided cage The shape of the cage bars minimizes stress concentration and enhances lubricant film formation.

6 The low cross-sectional height of the cage promotes oil flow through the bearing and quick formation of a lubricant optimized roller set film. The low weight of the cage reduces To minimize the risk of smearing or wear, inertial forces, which improves the sliding especially during the running-in phase, the behaviour of the cage, especially under light rollers in SKF high - capacity cylindrical roller load conditions. bearings have been coated, as standard, The cage can be either inner or outer ring with black oxide. shoulder-guided ( fig. 2). Shoulder-guided The increased number of rollers enables cages are beneficial if high speed, rapid higher static and dynamic load ratings com- acceleration or shock load occur. pared to standard cylindrical roller bearings with a cage. 4. The SKF Explorer A higher level of performance Unique heat treatment process advantage When compared to full complement cylin- drical roller bearings , SKF Explorer high .

7 To cope with extreme operating conditions like those in wind turbine gearboxes, SKF. In contrast to full complement cylindrical capacity cylindrical roller bearings undergo Explorer high - capacity cylindrical roller roller bearings , all SKF high - capacity cylin- a number of enhancements. These enhance- bearing components undergo a customized drical roller bearings are available in the ments are designed to improve reliability heat treatment process that enhances SKF Explorer performance class. The SKF and increase the service life of the bearing , toughness and reduces the possibility of Explorer performance class is standard for even in the most demanding applications. premature bearing failure. bearings in the 23 series up to a 150 mm The superior performance of SKF Explorer bore diameter and for bearings in the 22 class bearings is mainly achieved by three Advanced surface finish series up to a 200 mm bore diameter.

8 SKF key features. The surface topography of the rolling ele- Explorer performance class bearings provide ments and raceways of SKF Explorer bear- the following benefits compared to standard Extremely clean steel ings has been optimized , through advanced bearings : SKF Explorer bearing quality starts at the processes, to create an optimal combination most basic level, with steel that is extremely of properties that reduce friction and en- longer bearing life clean and has the lowest possible number of hance the formation of a hydrodynamic film. reduced friction losses impurities. By using only steel that is highly This maximizes the effects of the lubricant, extended maintenance intervals homogenous, SKF bearings have the same while reducing heat generation, noise and higher load carrying capacity material strength throughout, without weak vibration levels. improved wear-resistance spots. It is this high -purity material that lower energy consumption gives SKF Explorer bearings their exceptional lower cost of ownership strength and durability.

9 It also enables the Recommended for wind increased productivity steel to withstand SKF's unique heat treat- energy applications lower noise and vibration levels ment process, which further enhances performance. SKF Explorer high - capacity cylindrical roller bearings , with their optimized surface finish, are recommended for the typical conditions in wind energy applications. Conventional bearings used in such applications can suffer from frequent starts and stops, because after each start it takes a certain time to build up the lubricant film. SKF Explorer high - capacity cylindrical roller bearings have a surface finish, which quickly promotes the formation of a lubricant film. 5. Functionality and long-term tests Light-load test Cage speed and Based on the endurance test results Focusing only on high load carrying capacity functionality test and an in-depth examination of the various bearing components after the test, no becomes risky if loads can vary and drop To substantiate claims of improved per- limitations could be found for the SKF high - below the required minimum load.

10 This is formance, functional validation tests under capacity cylindrical roller bearing compared even more critical at high speeds where the varying conditions were conducted by SKF. to bearings with a standard cage. roller -slip ratio (relative sliding between the To assess speed capability and cage sta- rollers and raceways) can increase. bility, tests were performed to compare the Under these high -speed, light-load con- performance of SKF high - capacity cylindrical Field experience ditions, the inertial forces, combined with roller bearings to bearings containing a inadequate lubrication, can substantially standard shoulder-guided brass cage. Several sizes of SKF high - capacity cylindrical increase the risk of smearing, which can The tests were conducted under different roller bearings have been running success- quickly cause bearings to fail. Therefore, lubrication conditions. In one case, oil with fully for years in wind turbine applications.


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