Five Common Uses Of Rotary Bearing Of Rotary Table
Five Common Uses Of Rotary Bearing Of Rotary Table
2021年12月7日
Introduction Of Hydrostatic Gas Lubricated Bearing
Introduction Of Hydrostatic Gas Lubricated Bearing
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Comparison Of Preloading Mode And Rotational Speed Between Ceramic Ball Bearing And All Steel Bearing

The stiffness change law of ceramic ball fag bearing is similar to that of all steel bearing, but the change is relatively gentle. Under the positioning preload, the centrifugal force of the inner ring and the ball and the action of friction heat increase the contact load of the inner and outer rings. At the same time, the contact angle of the outer ring decreases and the contact angle of the inner ring increases, so as to increase the contact stiffness, but the decrease of the contact angle of the outer ring slows the increase of axial and angular stiffness.

 

Under different situations:

Constant pressure preloading:

 The centrifugal force of the ball increases, the contact load of the outer ring increases and the contact angle decreases. Because the inner and outer rings allow axial displacement, the contact load of the inner ring is basically unchanged, but the contact angle increases. Thermal displacement and centrifugal displacement have little effect on the contact load and contact angle of inner and outer rings.

Comparison Of Preloading Mode And Rotational Speed Between Ceramic Ball Bearing And All Steel Bearing

Although the normal contact stiffness of the outer ring increases. The normal contact stiffness of the inner ring is basically unchanged. The radial stiffness increases but not much as a result of the series action, while the axial and angular stiffness decreases significantly with the decrease of the contact angle of the outer ring.

 

Positioning preload:

The stiffness of ceramic ball ina bearing is less than that of all steel bearing, while under constant pressure preload, the stiffness of ceramic ball bearing is greater than that of all-steel bearing.

The contact load of all steel NSK bearings is more than twice that of the ceramic ball bearing. Although the elastic modulus of the ceramic ball is high, the stiffness of all steel bearings is greater than that of the ceramic ball bearing.

 

Constant pressure preloading:

The contact load of the inner ring changes little, and the elastic modulus of the ceramic ball is high, which makes the stiffness of the ceramic ball bearing greater than that of the all-steel NTN bearing.