Abutment dimensions should fulfill the following:
- Support surfaces on shafts and in housings should be at right angles to the shaft or housing axis and should provide uninterrupted support over the entire washer face.
The abutment diameter on the shaft should be ≤ Ea and in the housing ≥ Eb.
Values for Ea and Eb (→ product table) take the movement and position of the roller set into consideration.
Shafts and housings should be manufactured to suitable tolerance classes (table 1).
to provide satisfactory radial guidance for the individual thrust bearing components:
Housing centred washers → radial space between the shaft and washer bore required
Shaft centred washers → radial space between the washer and the housing bore required
- Housing centred washers → radial space between the shaft and washer bore required
Needle roller and cage thrust assemblies in the AXW series are generally combined with drawn cup needle roller bearings (fig. 1) or needle roller bearings with machined rings (fig. 2). The same housing tolerance must be selected for the centring flange as for the radial bearing.
Raceways on shafts and in housings
- should have the same hardness, surface finish and axial run-out as a bearing washer, if the load carrying capacity of a needle roller and cage thrust assembly is to be fully exploited
- should be designed using the dimensions Ea and Eb (→ product table), which take radial displacement of the roller set into consideration
For additional information, refer to Raceways on shafts and in housings.