How to interpret the bearings for motors
There are three main types of bearings for motors: rolling bearings, plain bearings, and oil-impregnated bearings that support the rotating parts of the motor. Miniature or small motors generally use oil-impregnated bearings, with few accessories and maintenance-free, which is conducive to simplifying the structure; sliding bearings are mainly used in medium and large-sized motors, suitable for heavy-duty and impact-resistant applications; rolling bearings are the most widely used, the following Ms. The topic is mainly for this type of bearing.
How to identify bearings
The rolling bearing code consists of the predecessor code, the basic code and the suffix code. The predecessor code is represented by the letter, meaning the complete bearing sub-component; the basic code indicates the main characteristics of the bearing type and size; the suffix code indicates the bearing precision and material characteristics. .
Bearing rear code and its meaning
●Common internal structure code meaning example
B——Angle contact ball bearing with contact angle of 40°
C——Angular contact ball bearing with contact angle of 15°
AC - angular contact ball bearings with a contact angle of 25°
E - enhanced design
● Sealing, dustproof and external shape change code and meaning examples
●Tolerance level code
P0 - dimensional accuracy is P0
P6 - size accuracy is P6
P5 - size accuracy is P5
P4 - size accuracy is P4
P2 - size accuracy is P2
The accuracy of rolling bearings increases from 0 to 10 in order.
Bearing seal structure
2Z——The bearing with dust cover is used for the bearing configuration where the pollution is not serious and there is no danger of contact with the bearing such as moisture and steam. The dust cap is 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, and the application is similar to the dust cover, which is slightly better than the dust cover.
2RS - Bearings with contact seals (referred to as seals) are often used in bearing arrangements where contamination is moderate, there is a splash of moisture or water, or a maintenance-free long-term service life is required.
