Bearing fit

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1. The choice of cooperation

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The inner diameter and outer diameter of rolling bearings are manufactured according to standard tolerances. The tightness of the fit between the bearing inner ring and the shaft, the outer ring and the seat hole can only be achieved by controlling the tolerance of the journal and the tolerance of the seat hole. The matching between the inner ring of the bearing and the shaft adopts the base hole system, and the matching between the outer ring of the bearing and the seat hole adopts the base shaft system.

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To select the fit correctly, it is necessary to know the actual load conditions, operating temperature and other requirements of the bearing, but it is actually very difficult. Therefore, in most cases, the selection is based on the use of fine grinding.

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Second, the size of the load

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The amount of overwind between the ferrule and the shaft or housing depends on the size of the load. For heavier loads, use a larger amount of overwind, and for lighter loads, use a smaller amount of overwind.

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Precautions for use

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Rolling bearings are precision parts, so it is required to be cautious when using them. Even if high-performance bearings are used, if they are used improperly, they cannot achieve the expected performance effects. Therefore, the use of bearings should pay attention to the following matters:

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1. Keep the bearing and its surrounding environment clean. Even very small dust entering the bearing can increase bearing wear, vibration and noise.

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2. Be careful and careful when installing, do not allow strong stamping, do not directly hit the bearing, and do not allow pressure to be transmitted through the rolling elements.

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3. Use the correct installation tools, try to use special tools, and try to avoid the use of cloth and short fibers.

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Fourth, to prevent the bearing from corroding and rusting, it is best not to hold the bearing directly by hand, but to apply high-quality mineral oil before operating it. In the rainy season and summer, special attention should be paid to rust prevention.

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