How to match the inner ring and outer ring with the plastic bearing end cap?

1. Check that the joint surface and stop of the plastic bearing end cap should be flat, clean and free of rust spots. If the bumps are uneven, use a file to smooth the bumps. Clean the rust spots and oil stains of the stamping parts with a white cloth;
2. Check that the plastic bearing end cap should be intact without cracks. If there are small cracks, small holes can be drilled at the ends of the cracks to disperse the stress, and the metal stamping parts can prevent the cracks from continuing to expand. If the crack is long, replace the new plastic bearing end cap;

3. Measure the inner diameter of the inner ring of the bearing, the outer diameter of the outer ring, the size of the shaft and the bearing sleeve to obtain a proper tight fit. Generally, the outer ring and the bearing sleeve can be matched with zero-to-zero. The tightening force is based on the principle that the bearing is installed and can rotate freely and flexibly. It is adjusted according to the size of the shaft diameter. For example, the assembly tightening force of the bearing with an inner diameter of 120mm is preferably 0.01～0.02mm. 
Because in the motor maintenance, there are still many cases where the bearing runs on the outer ring. The conventional maintenance method is to hit onion and add curing glue, but the spraying effect is better. Of course, it is best to replace the plastic bearing end cap of automobile stamping parts, which is simple and convenient.

Automotive stamping parts. The size we generally require when spraying is that the plastic bearing end cap is 1 to 2 wires smaller than the outer ring of the bearing.
4. When the retainer bearing is placed upright, the minimum clearance at the upper part must meet the following requirements:
Bearing inner diameter (mm) 50 or less 50～120 120 or more
Minimum clearance of upper part (mm) 0.9 1.5 2.2
For rigid retainers, friction with the inner ring is allowed, and the minimum gap between the lower part and the inner and outer rings is not less than 0.2～0.4mm when measuring metal stampings when placed vertically; for plastic retainers, friction with the inner and outer rings is allowed, but the bearing should not be used when rotating card.

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