Thrust ball bearings are constructed by raceways with washers, balls and cages. The raceway associated with shaft is called shaft washer, associated with housing is called housing washer.Double-direction bearings will associate the washer with the shaft. Single-direction bearings can carry single-direction axial load, double-direction bearings can carry double-direction axial load (Neither of them can carry radial load). The bearing with spherical mounting surface has self-aligning property, which can reduce the mounting error. Thrust ball bearings are separable.
1. 51000 type single-row thrust ball bearings
This type of bearings can only accommodate axial load on one direction and can control the axial movement on one direction of the shaft and housing.
2. 560000 type thrust angular-contact ball bearing
Generally, thrust angular-contact ball bearings adopt solid cages, as this structure can carry axial load and radial simultaneously.
Dynamic equivalent axial load
When *=90°, thrust ball bearings can only carry axial load and its dynamic equivalent axial load is:
Pa=Fa When **90°, Acted by constant and invariable radial and axial loads, the dynamic equivalent axial load is:
Pa=XFr+YFa See Annexed Table 1 for the coefficients of X and Y.
Static equivalent axial load
When *=90°, the static equivalent axial load is, Poa=Fa When **90°, the static equivalent axial load is,
Poa=2.3Frtan*+Fa Where: For double-direction bearings, this equation is applicable to the status when the ration of radial load and axial load is an arbitrary value; For single-direction bearings, when Fr/Fa*0.44ctg*, the equation is reliable; when Fr/Fa > 0.67ctg*, the equation can still give satisfactory Poa value, but not very conservative.