Noise phenomenon and measures of cage in bearings

This noise is produced by the free vibration of the cage and its impact with the rolling elements or rings during the rotation of the bearing. It may appear in all kinds of bearings, but its sound pressure level is not too high and low frequency.

a. Both stamping cages and plastic cages can be produced.

b. Both thin oil and grease lubrication will appear.

c. It is most likely to occur when the outer ring is subjected to a bending moment.

d. It is easy to appear when the radial clearance is large.

Because the cage pocket clearance and cage and ring clearance inevitably exist in the finished bearing, it is very difficult to completely eliminate the cage noise, but it can be reduced by reducing assembly errors. Reasonable clearance and cage play are preferred to improve.

Another kind of special sound of cage is the noise caused by the self-excited vibration of the cage caused by the friction between the cage and the guide surface of other bearing parts. The stamping cage of the deep groove ball bearing is thin, and the rigidity is low in the radial direction, and the overall stability is poor. '.

When the bearing is under the radial load and the grease performance is poor, the noise of 'click, click' will be heard in the early stage of operation. The noise caused by the sudden loading and unloading collides with the cage. This impact sound is inevitable but will disappear after a period of operation.

Measures to prevent cage noise:

a. In order to stabilize the revolving motion of the cage, the ferrule guiding method should be used as much as possible and the guiding surface should be fully lubricated. The fouling of the lower tapered roller bearing was improved, and the roller-guided L-type cage was changed to a Z-type cage guided by the ring rib.

b. When the bearing rotates at high speed, the vibration amplitude of the cage of the bearing with a large pocket clearance is much larger than that of the cage with a small pocket clearance, so the value of the pocket clearance is particularly important.

c. Pay attention to minimize the radial clearance.

d. Try to increase the degree of maintenance and improve the surface quality of the cage, which is beneficial to reduce the noise caused by the collision or friction between the rolling element and the cage.

e. Actively use advanced cleaning technology to effectively and thoroughly clean spare parts and products after fitting, and improve the cleanliness of bearings