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TEDIN Bearing Co., Ltd.

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Don't understand bearings? Check this out
Aug 12, 2018

1. Matching system of rolling bearing

In general, the base hole system is adopted, but if it is a standard part, the matching property of the part matching with it is determined by the standard part. As for the rolling bearing, as it is a standard part, the part matched with the outer ring adopts the base shaft system. The shaft matched with the inner ring is made of base hole.

The alignment of the bearing inner ring with the shaft is based on the hole, although all tolerances of the bearing inner ring are below the zero line and the upper deviation is zero. The main reason is the special requirement of bearing fitting. In most cases, the bore of the bearing should rotate with the shaft, and the fit between the two must be a certain degree of interference.

2. Selection of the axle journal and bearing pedestal with tolerance grade

The tolerance level of the bearing is closely related to the tolerance level of the bearing. Generally, the shaft matched with grade 6 and 0 bearings has a tolerance grade of IT5~IT7, and the box body holes are mostly IT6~IT8.

3. Match the nature of the selection

The choice of bearing matching property is to determine the basic deviation code of the journal and bearing seat which are matched with the bearing.

The choice of bearing fit is based on: load type of bearing inner and outer ring, load size of bearing, working conditions of bearing, material and loading and unloading requirements of holes and shafts which are suitable for bearing.

The load type

Local load: the combined radial load acting on the bearing is relatively static with the ring, that is, the load direction is always acting on the local area of the ring raceway. Usually small clearance fit or transition fit.

Cyclic load: the resultant radial load acting on the bearing rotates relative to the ring, that is, the resultant radial load ACTS on the entire circumference of the ring. Usually a tight or tight transition fit is used.

Oscillating load: the synthesis of the radial load acting on the bearing and the bearing ring relative oscillation in some area, the synthesis of radial load change often, even in the ring groove on the part of less than 180 ° circumference of a circle.

4. Load size

Under the action of bearing load, the ring will be deformed, resulting in uneven surface stress, resulting in loose. Therefore, when the heavy load coordination should be tight, when the light load coordination should be loose. Generally, the load is classified as follows:

Light load: P < 0.07C

Normal load: 0.07C < P < 0.15C

Heavy load: P > 0.15c

Where: C is the rated load of the bearing, and the data can be found in the relevant manual.