High-speed precision angular contact ball bearing structure and performance

High-speed precision angular contact ball bearings are the most widely used type of rolling bearings in machine tool spindle units. In order to achieve high speed and high rigidity of the spindle unit, the machining accuracy and machining efficiency of the machine tool are improved. The limit speed of the bearing is the corresponding
Under the load of 15×104 hL10, the rotational speed of the heat generated by the shaft, the bearing seat and the lubricant is balanced with the heat generated by the friction of the bearing under a certain ambient temperature difference. The high-speed precision angular contact ball bearing stiffness affects the rigidity of the spindle unit and also affects the machining accuracy of the machine tool. The ability of the bearing to resist deformation under external loads is called bearing rigidity. The stiffness of a bearing is defined as the ratio of the amount of change in load experienced in a given state to the amount of change in relative displacement between the inner and outer rings.

The bearing bearing load is mainly divided into axial load, radial load and moment load. Correspondingly, the bearing stiffness can also be divided into axial stiffness, radial stiffness and angular stiffness. The knot of the precision angular contact ball bearing is a single rib of the outer ring and a double rib structure of the inner ring, and the cage is guided by a single rib of the outer ring. The single rib outer ring is beneficial to the excess lubricant flowing out of the outer ring channel, which not only reduces the friction stir friction of the lubricant, but also helps to reduce the friction heat of the contact point, and is one of the most commonly used structural forms of the high speed precision angular contact ball bearing.

In high-speed precision angular contact ball bearings, the frictional moment generated by spin sliding accounts for a large proportion of the bearing friction torque. The frictional moment generated by spin slip is proportional to the sinusoidal function of the bearing contact angle, the contact angle increases, and the spin slip increases. Reduce bearing connection. The antennae is beneficial to reduce the frictional moment caused by the spin slip, which is beneficial to reduce the bearing heat, thereby contributing to the improvement of the running speed of the bearing.