Time：2020.09.17 Source：Roller Bearings Suppliers

Preloaded Way and Rotate Speed of Bearings are important,today Wuxi Spark Bearing Co.,Ltd will introduce something about it:

There are two ways of bearing axial preload: one is constant pressure preload, the other is positioning preload.Under constant pressure preloading, the radial stiffness of the bearing increases slightly with the increase of rotating speed, while the axial and angular stiffness decreases rapidly.Under pre-positioning, the bearing's radial, axial and angular stiffness increase rapidly with the increase of rotating speed, but the axial and angular stiffness increase gently.

1. Influence of preload

With the increase of the preload, the radial, axial and angular stiffness of the bearing increase slightly, but the influence is very small.Compared with positioning preloading, this effect is more significant for constant pressure preloading.This is because the increase of the pre-load increases the contact Angle of the inner and outer rings, and also increases the contact load, thus increasing the radial, axial and angular stiffness.However, the change of contact load and contact Angle caused by preload is smaller than that caused by rotation speed and part displacement, so the influence on bearing stiffness is limited.This is also the reason why the change under positioning preloading is less than that under constant pressure preloading.

2. Influence of the radius of channel curvature

With the increase of the radius of curvature of the inner and outer ring of the channel, the radial, axial and angular stiffness decreases. However, this effect is small, and only the change of stiffness is slightly more obvious under positioning preloading. This is because the increase of the radius of curvature of the channel increases the amount of contact deformation.Therefore, the influence of the radius of curvature on the stiffness can be ignored when selecting the radius of curvature of the channel.Need WSBC 22314-E1A-MA-T41A,click here to learn more.

3. Influence of ball count

The radial, axial and angular stiffness increases slightly when the number of balls increases.The increase in the number of balls increases the stiffness, but under the same pre-load, the increase in the number of balls will reduce the contact load. The result of their joint action can increase the stiffness of the bearing, but less.

Under constant pressure preloading, the radial stiffness increases obviously when the number of balls increases, while the axial and angular stiffness decreases when the rotating speed increases to a certain value, but the change is very small.This is because under constant pressure preloading, the increase in the number of balls reduces the contact load of the inner ring, but at the same time reduces the contact Angle of the inner ring. Their combined effect increases the radial stiffness of the bearing significantly, while the axial and angular stiffness slightly decrease.

Therefore, when the number of balls increases, the preload should be increased accordingly. Only when the contact load is the same, the increasing number of balls can increase the bearing stiffness.

4, the ball diameter of the shadow

Under the positioning preload, the ball diameter increases, and the radial, axial and angular stiffness increases slightly.The increase of ball diameter increases the centrifugal force of the ball, decreases the contact Angle of the outer ring and increases the contact Angle of the inner ring, but at the same time increases the contact load of the inner ring. The result of their combined action increases the bearing stiffness.The influence of centrifugal force variation on contact load is small under the pre-tightening of orientation, so the influence of ball diameter variation on stiffness is small.

Under constant pressure preloading, the radial stiffness increases with the increase of ball diameter, while the axial and angular stiffness decreases on the contrary, but the influence is small.This is because the increase of ball diameter increases the centrifugal force of the ball, reduces the contact Angle of the inner and outer rings, and increases the contact load of the outer ring, while the contact load of the inner ring remains basically unchanged.

Therefore, the radial stiffness increases, while the axial and angular stiffness slightly decreases.Therefore, reducing the ball diameter not only improves the speed performance, but also does not reduce the stiffness performance.This also proves from theory that reducing small diameter ball is one of the development trends of spindle bearing at present.

5. Shadow of initial contact Angle

The radial stiffness and axial and angular stiffness are significantly decreased with the increase of initial contact Angle under the preloading of positioning.This is because the initial contact Angle increases, the radial component of contact stiffness decreases, and the axial component increases. At the same time, the contact load decreases under the same preload.Click here to learn more about WSBC 22320-E1A-MA-T41A.

Under constant pressure preloading, the radial stiffness decreases significantly with the increase of initial contact Angle.At low speed, axial and angular stiffness increase, while at high speed, there is basically no change.This is because under constant pressure preloading, axial displacement is allowed in the inner and outer rings. In order to maintain the balance of forces, the contact Angle of the outer ring is almost 0, and the initial contact Angle basically has no influence on the contact Angle of the outer ring.Similarly, the initial contact Angle increases and the contact load decreases under the same preload.

Therefore, increasing the initial contact Angle of the bearing under positioning preloading can improve the axial and angular rigidity, while increasing the initial contact Angle under constant pressure preloading can not improve the axial and angular rigidity, but reduce the radial rigidity.

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