AGMA 12FTM02

The application of cylindrical roller bearings (CRB) is widelyspread in mechanical engineering. CRB can carry comparatively highloads and are usable in high speed ranges. These bearings have beenproven to be variously applicable and economic. With lipped innerand outer rings CRB permit the transmission of axial loads inaddition to radial loads. The axial load is induced on the lip ofthe inner or the outer ring and transferred by the roller end facecontacts to the opposing lip. In comparison to an only radiallyloaded bearing there are additional friction losses in the contactbetween the lip and the roller ends as a result of sliding. Thelimiting factors for the permissible axial load are hightemperatures which can cause smearing and seizing, lip fracture,fatigue failure and wear. In consequence of the axial loading thestresses in the contact between the roller and the raceway rise andthe fatigue durability of the bearing is reduced. At high speedsthe permissible thrust load is dominantly limited by hightemperatures. At low speeds the limiting factors are lip fractureand wear. Within the examination an extensive test program withdifferent bearing geometries is carried out. Thereby the decisivemeasurand is the friction torque of the bearings. The frictiontorque of a thrust loaded radial cylindrical roller bearing ismainly dependent on the parameters speed, load, size and design ofthe bearing. An analytical simulation model which has beendeveloped at the institute allows calculating the lubricationconditions, the stresses within the lip ­ roller contact and theaxial load dependent friction torque. The intention of the study isto enlarge the application range of radial cylindrical rollerbearings by means of a more precise determination of the thrustload capacity and to allow more economic designs.

Edition:

12

Published:

10/01/2012

Number of Pages:

11

File Size:

1 file , 410 KB