Bearing Solutions for Large Size Machinery One-bearing solutions Two-bearing solutions Three-bearing solutions

“added competence” for your success With their forward-looking bearing arrangement solutions for feed spindles, main spindles, rotary tables and linear guidance units, INA and FAG have been at the forefront of the world market for decades. Nevertheless, bearing components alone are often no longer the decisive factor for these machine subsystems. Indeed, our customers are continuing to benefit directly from significant performance improvements and unique selling points thanks to our “ready-to-fit” products, since these follow the efficient basic concept: unpack, screw mount, use. In order to...

Bearing solutions for large size machinery The general trend towards plant with higher productivity is also apparent in larger production systems. As a result, there is increasing demand for correspondingly high performance components and subassemblies of larger dimensions. The challenges here are not only technical but also commercial in nature and may vary widely. Components for bearing arrangements are among the machine elements that make a decisive contribution to the overall performance of a system. For bearings in machine tools, the important parameters are not only the load carrying capacity...

Schaeffler Technologies

Technical principles Bearing solutions One-bearing solutions Two-bearing solutions Three-bearing solutions Products for bearing solutions Crossed roller bearings Axial deep groove ball bearings Single row angular contact ball bearings Axial cylindrical roller bearings Single row tapered roller bearings Radial cylindrical roller bearings Equipment and services for the mounting and maintenance of rolling bearings Appendix Addresses Checklists

Technical principles Selection criteria Load carrying capacity and rating life Friction and increases in temperature Speeds Lubrication Bearing data Design of bearing arrangements Mounting

Technical principles Page Selection criteria Load carrying capacity and rating life Friction and increases in temperature Bearing data Design of bearing arrangements Schaeffler Technologies

Selection criteria Procedure for bearing selection Geometrical boundary conditions The diameter of the faceplate (table diameter) is determined by the range of parts to be clamped. The main support bearing selected should have a diameter approx. 2/3 of the faceplate diameter. In the case of faceplates with a diameter larger than 7 m, bearings with a diameter 50% of the faceplate bearing are permissible. With this restriction, the selection can then be continued in relation to the achievable speed. The speed capacity, as a precondition for favourable cutting parameters, is heavily dependent on...

Rating life Safety factors Dynamic load carrying capacity In order to achieve an adequate fatigue life Lh, the bearings must have an appropriate load carrying capacity, expressed in terms of their basic load ratings, that is dependent on the load. This can be influenced on the one hand by the bearing size and also by the bearing type. For smooth running, the objective should be a factor fS м 4. It is not normally necessary to factor in any additional safety in calculation. In special cases, such as approval specifications, internal specifications, requirements stipulated by inspection bodies...

Load carrying capacity and rating life Basic rating life The basic rating life L10 and The basic rating life in millions of revolutions is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops Basic dynamic load rating Equivalent dynamic bearing load for radial and axial bearings Life exponent; The basic rating life in operating hours according to the definition for L10 Equivalent dynamic bearing load Operating speed. The equivalent dynamic load P is a calculated value. This value is constant in...

Friction and increases in temperature Frictional component and influencing factor The friction in a rolling bearing is made up of several components, see table. Due to the large number of influencing factors, such as dynamics in speed and load, tilting and skewing resulting from mounting and operation, the actual frictional torques and friction values may deviate significantly from the calculated values. If the frictional torque is an important design criterion, please consult the engineering service of the Schaeffler Group. Frictional component Influencing factor Rolling friction Sliding friction...

Friction and increases in temperature Determining the friction values For this process, the speed and load must be known. The type of lubrication, lubrication method and viscosity of lubricant at operating temperature are further important factors in calculation. Total frictional torque MR: Frictional torque as a function of speed: Frictional torque as a function of load for cylindrical roller bearings: Frictional torque as a function of load for ball bearings, tapered roller bearings and spherical roller bearings: Total frictional torque Frictional torque as a function of speed Frictional torque...

Bearing factors Bearing factors for cylindrical roller bearings with cage The bearing factors f0 and f1 are mean values derived from series of tests and correspond to the data according to ISO 15312. The bearing factors f0 are stated for oil injection lubrication, see tables. The bearing factor f0 increases, for the same mean bearing diameter dM, with the size of the balls or the roller length and thus indirectly with the size of the bearing cross-section. In the tables, the wide series therefore have larger bearing factors f0 than the narrow series. Where radial bearings operate under radial...

Friction and increases in temperature Bearing factors for axial deep groove ball bearings Decisive load for ball bearings and tapered roller bearings Bearing factor f0 Oil injection, recirculating oil Bearing type Deep groove ball bearings Angular contact ball bearings, single row Tapered roller bearings Schaeffler Technologies