SKF Cylindrical Roller Bearings - Always in the Lead Contents
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SKF cylindrical roller bearings - always in the lead Contents The SKF brand now stands for more than ever before, 1 Product information ................................................. 3 and means more to you as a valued customer. Accommodate heavy loads, high speeds and axial displacements...................................................... 3 While SKF maintains its leadership as the hallmark of SKF single row cylindrical roller bearings – quality bearings throughout the world, new dimensions better by design ........................................................... 4 in technical advances, product support and services SKF standard bearings – benefits ............................... 5 have evolved SKF into a truly solutions-oriented supplier, Optimized cross section .............................................. 5 creating greater value for customers. Optimal contact conditions ......................................... 5 Interchangeability of bearing components .................. 5 These solutions encompass ways to bring greater Cages made of three different materials ..................... 6 productivity to customers, not only with breakthrough A wide product range .................................................. 7 application-specific products, but also through leading- SKF Explorer cylindrical roller bearings – edge design simulation tools and consultancy services, a new level of performance ......................................... 10 plant asset efficiency maintenance programmes, and Availability .................................................................... 13 the industry’s most advanced supply management Product designation .................................................... 13 techniques. High performance in all applications.......................... 14 The SKF brand still stands for the very best in rolling 2 Recommendations ................................................... 16 bearings, but it now stands for much more. Selection of bearing size.............................................. 16 SKF – The knowledge engineering company Bearing life ................................................................... 16 Previous and new – a comparison ............................... 17 Design of bearing arrangements ................................ 18 Mounting and dismounting.......................................... 20 Mounting ...................................................................... 20 Dismounting ................................................................. 21 Lubrication and handling ............................................. 22 Lubrication ................................................................... 22 Bearing handling .......................................................... 22 Comprehensive support for long-term success........ 23 3 Product data ............................................................. 24 Bearing data – general ................................................. 24 Product table................................................................. 32 Other SKF cylindrical roller bearings.......................... 62 SKF – The knowledge engineering company ............ 64 2 1 Product information 2 Recommendations 3 Product data Design features Page ............. 16 Page ............. 24 Accommodate heavy loads, high 1 speeds and axial displacements Cylindrical roller bearings are produced simplifies installation, particularly if an NU design: The outer ring has two in many designs, ISO Dimension Series interference fit is required for both integral flanges while and sizes. The vast majority are single rings. the inner ring has no row cylindrical roller bearings with a Single row cylindrical roller bearings flanges cage. These bearings are an excellent with a cage are produced in many de- N design: The inner choice for applications where there are signs, differing primarily in the config- ring has two integral particularly heavy radial loads combined uration of the flanges. The rollers are flanges while the outer with high speeds, especially if there is always guided between integral flanges ring has no flanges a limited amount of axial displacement on one of the rings. The ring with the of the shaft with respect to the hous- integral flanges together with the NJ design: The outer ing as a result of thermal elongation. cylindrical roller and cage assembly ring has two integral As axial displacement takes place can be withdrawn from the other ring. flanges while the inner within the bearing, there is practically The most popular single row cylindrical ring has one integral no increase in friction as the bearing roller bearings are those of the NU, N, flange rotates. NJ and NUP designs. NUP design: The Single row cylindrical roller bearings outer ring has two are separable, i.e. the ring with roller integral flanges while and cage assembly can be mounted the inner ring has one independently of the other ring. This integral flange and one loose flange ring High radial load carrying capacity High speed capability Accommodate axial displacement Separable design 3 1 Product information 2 Recommendations 3 Product data Customer benefits Page ............. 16 Page ............. 24 SKF cylindrical roller bearings – better by design Norma-Compagnie, Cannstatt, Germany. offered three additional advantages: SKF milestones leading This company was incorporated into increased axial load carrying ability, to the single row cylindrical the SKF Group in 1914. Since then, optimized running properties and roller bearings of today the history of the single row cylindrical reduced maintenance. These are just roller bearing has been intertwined two of the SKF pioneering successes 1909: Patent granted to Dr.-Ing. with that of SKF and there have been from the past. Kirner for the “NU bearing” many developmental milestones. In addition to the caged single row 1930: Participation in standardiza- With each milestone, SKF offered cylindrical roller bearings described tion of boundary dimensions design and maintenance engineers and listed in this brochure, the compre- 1950: Introduction of the “B” roller, the option to power up, size-down hensive SKF cylindrical roller bearing slightly crowned toward the and improve the performance of their assortment also includes single and roller ends, in order to prevent application. double row full complement bearings damaging edge stresses In the 1960s, SKF’s development of (without cage), precision bearings, 1962: Introduction of the E-type the E-bearing, with its reinforced roller multi-row bearings, printing press cylindrical roller bearings with complement, increased the load carry- bearings as well as support rollers reinforced roller complement ing ability by an average of 35 %. Then, (➔ pages 62 and 63). 1981: Introduction of the EC in the 1980’s when SKF introduced the cylindrical roller bearings with single row EC cylindrical roller bearing, modified roller end/flange design engineers and end-users were contact 1984: Introduction of the logarithmic contact profile providing excellent load distribution 2002: Introduction of SKF Explorer performance class bearings Cylindrical roller bearings are a tradi- tion within SKF. It is hardly surprising that the major technical developments for these bearings have been initiated by SKF. It all started in 1909 with the inven- tion of the modern caged single row cylindrical roller bearing by Dr.-Ing. Josef Kirner, a leading engineer at the 4 1 Product information 2 Recommendations 3 Product data Customer benefits Page ............. 16 Page ............. 24 Fig 1 SKF standard bearings The second improvement deals specifically with the roller end/flange 1 – benefits contact. The geometry of the flange Conventional EC design ➔ design When an application calls for bearings has an “opened” design ( fig 3 ) and that can accommodate heavy radial the roller ends are surface treated to loads, high speeds and axial displace- improve the effectiveness of the lubri- ment of the shaft with respect to the cant, reduce friction and lower opera- housing, SKF single row cylindrical ting temperatures. The improved roller roller bearings are an obvious choice. end/flange contact results also in high- These bearings are always state-of-the- er axial load capability for those bear- art and they feature ings with flanges on inner and outer rings. • an optimized cross section, The optimal internal geometry • excellent contact conditions, provides • interchangeability of bearing Optimized cross section components • higher radial and axial load carrying • cages made of three different capacity, materials and • higher operational reliability, • a wide product range. • longer service life, • extended maintenance intervals, Fig 2 The result is an assortment of cylind- • lighter, more compact, energy-saving Conventional Logarithmic rical roller bearings that will provide designs. contact profile contact profile long service life even under the most arduous operating conditions. Interchangeability Optimized cross section of bearing components Another advantage of SKF single row The cross section of SKF cylindrical cylindrical roller bearings is that the roller bearings is optimally utilized. The bearing components are completely diameter and length of the rollers and interchangeable. Any bearing ring with the wall thickness of the rings and cage and roller assembly can be retaining flanges have been optimized assembled with any removable ring of to provide maximum bearing service the same bearing type and size. This life (➔