It is essential to select radial internal clearance which is suitable for the operating conditions, because the bearing internal clearance after mounting greatly influences the properties such as bearing life operating temperature and vibration.
As a general rule, the bearing internal clearance of a Ball Bearing should be close to zero when mounted and running at its operating temperature. For this purpose the following must be considered.
- 1. Fitting conditions.
- 2. Temperature conditions of the bearing and adjacent parts.
- 3. Load conditions and the optimum clearance in service.
- 4. Shaft deflection and possible error in bearing mounting.
SRS bearing manufactured with normal internal clearance, will run satisfactorily under ordinary operating conditions and with shafts and housing limits for light and normal loads. Bearing with greater or smaller internal clearance than normal are required where operating and mounting conditions differ from the normal, requiring interference fits for both rings, unusual operating temperatures etc. Bearings with a clearance other than the normal are identified by the suffixes C1 to C5.
- C1 - radial internal clearance less than C2.
- C2 - radial internal clearance less than normal.
- C3 - radial internal clearance greater than normal.
- C4 - radial internal clearance greater than C3.
- C5 - radial internal clearance greater than C4.
Single Row Taper Roller Bearing are ordinarily mounted in pairs and the suitable operating clearance and / or preload is adjusted during mounting. The magnitude of axial clearance or of the preload is selected according to the operating conditions, the bearing size and type and according to the required rigidity of the application.