1、 Four point contact ball bearing is a kind of radial single row angular contact ball bearing. The designed raceway is used to support the axial load in two directions. The four point contact ball bearing can bear the radial load up to a fraction of the axial load. Compared with the double row bearing, the axial space occupied by the four point contact ball bearing will be significantly reduced.


The contact angle of SKF four point contact ball bearing designed by QJ is 35 ° Or 45 °。 The inner ring is a split inner ring. In this way, a large number of rolling balls can be loaded into the bearing, which can give the bearing a higher load bearing capacity. The SKF four point contact ball bearing is of separate design, that is, the outer ring with rolling ball and cage assembly can be installed separately with two inner ring half rings.


2、 The inner ring (or outer ring) of the four point contact ball bearing is precisely assembled by two half rings, and the curvature radius of the groove of its overall periphery (or inner ring) is very small, so that the steel ball and the inner and outer rings are in contact at four "points", which not only increases the radial load capacity, but also can bear large axial load in two directions with compact size, And it has a good ability of axial limit in two directions, because its axial clearance is relatively small, and its contact angle (generally 35 °) There is a bigger reason.


3、 The allowable speed of the four point contact ball bearing is also very high, and the operation is very stable. Its double half circle can be removed from the whole set of bearings for installation respectively. Therefore, the four point contact ball bearing is mostly used in the engine, because it can bear a large radial load and axial load at a higher speed.