A four-point contact ball bearing is a radial single row angular contact ball bearing designed to support axial loads acting in both directions. Four-point contact ball bearings can withstand up to a fraction of the radial load of the axial load. Compared with double-row bearings, the axial space occupied by the four-point contact ball bearing is significantly reduced.
The contact angle of the SKF four-point contact ball bearing designed by QJ is 35° or 45°. The inner ring is a flat inner ring. This allows a larger number of balls to be placed in the bearing, which gives the bearing a higher load bearing capacity. The SKF four-point contact ball bearing is a separate design, that is, the outer ring with the ball and cage assembly can be installed separately from the two inner ring half rings.
2. The inner ring (or outer ring) of the four-point contact ball bearing is precisely assembled from two half-circles, and its overall peripheral (or inner ring) groove has a very small radius of curvature, making the steel ball and inner The outer ring is in contact at all four "points", which not only increases the radial load capacity, but also can withstand a large axial load in two directions in a compact size, and has two very good The ability to axially limit the direction because its axial clearance is relatively small, and its contact angle (usually 35°) is relatively large.
The four-point contact ball bearing also has a very high allowable speed and runs smoothly. Its double half-turn can be removed from the entire set of bearings for installation, so the four-point contact ball bearing is mostly used in the engine because it It can withstand large radial loads and axial loads at higher speeds.
One of the two inner rings of the SKF Explorer's four-point contact ball bearing has a deep-bottomed fig. When this four-point contact ball bearing is used with SKF cylindrical roller bearings, the oil flow is increased. In addition, these deep recessed bottoms can also be used to secure the puller when disassembling such four-point contact ball bearings.
Four. Four-point contact ball bearing features:
The four-point contact ball bearing is a separable structure, and a single bearing can replace the angular contact ball bearing of the front combination or the back combination.
It can withstand radial load and bidirectional axial load and can limit the axial displacement in two directions, but it has less axial space than the current double row angular contact ball bearings.
Compared with other ball bearings, four-point contact ball bearings have smaller axial clearance and higher limit speed when the radial clearance is the same.
Four-point contact ball bearings are suitable for axial and radial combined loads that are subject to pure axial loads or axial loads. Due to the double inner ring (or outer ring), the number of balls is increased and the bearing capacity is large. Under normal working conditions, when the bearing is subjected to axial load in any direction, a contact angle can be formed, and the steel ball is in contact with the inner and outer races to avoid large sliding friction in the contact area. Therefore, the bearing should not be subjected to radial force and load.
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