Choose INA combined bearing
The oil to be inspected is evenly mixed and dropped on a white paper (preferably a filter paper) to form oil spots, and the oil spots gradually diffuse from the center outward for about 2 to 3 hours to form three concentric rings. The state of the oil can be discerned based on the color, width and shape of the three areas.
Remove a little oil from the low shell of the oil, apply it on your fingers, and rub it with your fingers and thumb. If you feel that there is impurities in the oil or that it is not sticky like water, or even hairy or sour, the oil has deteriorated. If you can see a small shiny metal grinding on your finger after honing, it means that the engine has a serious wear part, and it also means that the oil must be replaced immediately.
1. Selection of bearing model: The bearing model is generally selected by the user's technical personnel according to the service conditions of the supporting product and the bearing load. The business personnel mainly understand whether the actual load of the user is consistent with the selected bearing. If the combined bearing does not meet the requirements for use, the customer should be recommended 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: users generally only know what type and grade when buying bearings, rarely ask for clearance, business personnel must ask about the use conditions of the bearing, the speed and temperature of the combined bearing The tolerances are directly related to the choice of bearing 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 grease: the choice of grease is generally based on the combination of 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: bearing lubrication can be divided into oil lubrication and grease. Oil-lubricated bearings are generally selected from 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. The seal is divided into contact seal and non-contact seal. The contact seal has good dustproof performance but large starting torque. The non-connected seal has small starting torque but sealing performance. No contact is good.
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