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deepgroovebearing

The presence of moisture or water splashes are unavoidable

2Z——Bearings with dust cover are used for bearing configuration where pollution is not serious and there is no danger of moisture or steam contacting the bearing. Dust caps are also used in applications where friction reduction is important due to speed or operating temperature considerations.

2RZ——The bearings of non-contact seals are often used for pollution is not very serious, the application is similar to the dust cover, and the sealing effect is slightly better than the dust cover.

2RS—Bearings with contact seals (referred to simply as seals) are often used in bearing arrangements where medium pollution, the presence of moisture or water splashes are unavoidable, or require maintenance-free long-term service life.

About motor bearing clearance

● The radial (axial) clearance of the bearing is the radial (axial) movement of one set of rings from one radial (axial) limit position to the opposite limit position when there is no external load on the bearing )distance. In reality, due to the shape error of the ferrule and the inconsistency of the rolling body, it should adopt the average value of the radial (axial) displacement in different directions of the ferrule and different relative positions of the ferrule and the rolling body.

● Clearance is an important technical parameter of the bearing, which directly affects the technical performance of the bearing such as load distribution, vibration, noise, friction, temperature rise, service life and mechanical running accuracy.

a) If the clearance is too large, the bearing internal bearing area will be reduced, the contact surface stress will be increased, and the service life will be shortened. Excessive clearance will also reduce the accuracy of bearing operation and increase vibration and noise.

b) If the clearance is too small, negative clearance (interference) may occur in actual operation, causing increased frictional heat generation and increased temperature rise, which in turn makes the effective clearance smaller or the interference larger. Such a vicious cycle will lead to The bearing is locked.

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