There are two ways of axial preload of bearings, one is fixed pressure preload and the other is positioning preload. Under constant pressure preload, the radial stiffness of the bearing increases slightly with the increase of speed, while the axial and angular stiffness decrease rapidly. Positioning preload, bearing radial, axial and angular stiffness are rapidly increased with the increase of speed, but the increase of axial and angular stiffness is relatively flat. 1、The effect of preload With the increase of preload, the radial, axial and angular stiffness of the bearing increases. Axial and angular stiffness increase slightly, but the effect is very small. Compared with the positioning preload, this effect is more significant on the fixed pressure preload. This is because the preload increases the contact angle of the inner and outer ring, and also makes the contact load increase, so that the radial, axial and angular stiffness have increased. However, the contact load and contact angle changes caused by preload are small compared to those caused by speed and part displacement, so the effect on bearing stiffness is limited. This is also the reason why the change under positioning preload is smaller than that of fixed pressure preload. 2, the influence of the radius of curvature of the groove As the radius of curvature of the inner and outer ring groove increases, radial, axial and angular stiffness decreases, but this effect is very small, only the change in stiffness under positioning preload is slightly more obvious, which is due to the increase in the radius of curvature of the groove contact deformation increases. Therefore, the general choice of the radius of curvature of the channel can not consider its impact on the stiffness.

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