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What is the method to distinguish the quality of the bearing?


1, the choice of bearing model The bearing model is gen […]

1, the choice of bearing model
The bearing model is generally selected by the user's technician according to the conditions of use of the accessory product and the load bearing. The business personnel mainly understand whether the actual load of the user is consistent with the selected bearing. If the bearing does not meet the requirements for use, the customer should be advised to re-select the model as soon as possible, but unless the special product is selected on the model, there will be no problem.
2, the choice of bearing clearance
When purchasing a bearing, the user generally only informs the model and grade, and rarely asks for the clearance of the bearing. The business personnel must ask about the condition of the bearing, the speed of the bearing, the temperature, and the tolerance of the bearing are directly related to the bearing. The choice of clearance. Motors with a speed of 3,500 rpm or less generally use CM clearance. For example, high-temperature high-speed motors require relatively large clearance. After the assembly, the bearing clearance will be reduced due to the increase of the inner hole and the reduction of the outer circle. The reduction of the clearance = the interference amount × 60% (except for the bearing chamber is aluminum). For example, the clearance before the assembly of the bearing is 0.01 mm, and the interference at the time of assembly is 0.01 mm, and the clearance after the assembly of the bearing is 0.004 mm. In theory, the noise and life of the bearing are at the best state when the bearing is at zero clearance, but in the actual operation, considering the temperature rise and other problems, the clearance of the bearing after assembly is preferably 0.002mm-0.004mm.
3, the choice of oil
The choice of grease is generally based on the bearing speed, temperature resistance, noise requirements and starting torque, etc., requiring business personnel to understand the performance of various greases.
4, the choice of bearing seal type
Lubrication of bearings can be divided into oil lubrication and grease lubrication. Oil-lubricated bearings are generally selected form bearings, and grease-lubricated bearings are generally sealed with dust caps or rubber seals. The dust cover is suitable for high temperature or good environment, and the seals are in contact.

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