Angular Contact Ball Bearings

  • This type uniquely uses axially asymmetric races. While an axial load passes in a straight line through the bearing, a radial load takes an oblique path which tends to detach the races axially. This uniforms the angle of contact on the inner race with the outer race. Loading in both the radial and axial directions, ‘Combined loads’ are better sustained by the angular contact bearings and the contact angle of the bearings should be corresponded to the relative proportions of each. Larger contact angle, usually in the range 10 to 45 degrees will raise the axial load support, but minimize the radial load. Besides, the centrifugal forces generated by the balls in high speed applications such as turbines, jet engines, and dentistry equipment changes the contact angle at the inner and outer race.
  • Nowadays, ceramics such as silicon nitride are used regularly in such applications due to their low density i.e. 40% of steel. These materials significantly reduce centrifugal force and enables superior performance in high temperature environment. They are also moderately similar to that of bearing steel unlike a cracking or shattering glass or porcelain.