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Matching And Use Of Bearings

Released on Mar. 07, 2020

First, the choice of cooperation

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

To correctly select the fit, you must know the actual load conditions, operating temperature, and other requirements of the bearing, but it is actually very difficult. Therefore, most cases are based on the use of lapping selection.

Load size

The amount of overwin between the ferrule and the shaft or the shell depends on the load. A heavier load uses a larger amount of win, and a lighter load uses a smaller amount of win.

Zinc Alloy Bearing

Zinc Alloy Bearing

Notes on the use of zinc alloy bearing:

Rolling bearings are precision parts, so they need to be cautious when using them. Even if high-performance bearings are used, if they are not used properly, the expected performance results cannot be achieved. Therefore, pay attention to the following points when using bearings:

Rolling bearings are precision parts, so they need to be cautious when using them. Even if high-performance bearings are used, if they are not used properly, the expected performance results cannot be achieved. Therefore, pay attention to the following points when using bearings:

First, keep the bearing and its surroundings clean. Even very small dust entering the bearings can exacerbate bearing wear, vibration and noise.

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

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

4, to prevent bearing corrosion and rust, it is best not to directly take the bearing by hand, to apply high-quality mineral oil before operation, especially in the rainy season and summer, pay attention to rust prevention.

What causes early bearing damage? Custom bearing housing manufacturer Shares with you:

I. Improper installation (about 16%)

1. Use brute force during installation. Hitting the bearing directly with a hammer will cause the most damage to the bearing; it is the main cause of deformation.

2, the installation is not in place, the installation is biased or not installed in the bearing position, resulting in too small bearing clearance. The inner and outer rings are not at the same center of rotation, resulting in misalignment.

Suggestion: Choose appropriate or professional bearing installation tools, and use special instruments to test after installation.

Second, poor lubrication (about 50%)

According to investigations, poor lubrication is one of the main causes of premature bearing damage. The main reasons include: the lubricant or lubricating oil is not filled in time; the lubricant or lubricating oil is not filled in place; the lubricant or lubricant is not selected properly;

Recommendation: Select the correct lubricant or lubricating oil, and use the correct lubrication and filling method.

3. Pollution (about 14%)

Contamination can also cause premature bearing damage. Pollution means that sand, metal debris, etc. enter the bearing. The main reasons include: opening the bearing package prematurely before use, causing pollution; the working environment is not clean during installation, causing pollution; the working environment of the bearing is not clean, and the working medium is polluted.

Suggestions: It is better not to unpack the bearings before use; keep the installation environment clean during installation, clean the bearings to be used, and strengthen the sealing device of the bearings.

Fourth, fatigue (about 34%)

Fatigue failure is a common way of bearing damage. Common causes of fatigue damage may be: long-term overload operation of bearings; failure to repair in time; improper maintenance; aging equipment.


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