First, substitution principle of bearing mainly include the following:

The bearings work ability coefficient and allow the static load technical parameters should as far as possible is equal to the original import bearings technical parameters;

Should choose to allow limit rotational speed is equal to or higher than the original import bearings of the actual speed;

The substitution bearing tolerance level or lower than the original bearing tolerance level; To the same size, can't because of the change and change import bearings imported machine and the size of the combined bearing;

With the method of the bearings, to ensure the inside and outside of the collar with cylinder concentricity, and should be the correct choice of tolerance and cooperation.

Second, bearings rolling method

 substitution method of rolling bearings include direct substitution and back pad substitution two kinds, the latter including in the wide generation narrow, change the size of the shaft or housing holes

Direct the substitution. The substitution import bearing inner diameter and the diameter and thickness of the size and the original import bearings are all the same, do not need to take any measures can install and use.

Plus mat substitution. The substitution import bearing outside diameter and the original inner diameter and import bearings are all the same, only a narrow width, can be made with alternative mat. For the thickness of the gasket is equal to the original import the original import bearings and alternative bearing the width of the poor. Gasket inside diameter and the axial clearance fit, for imported bearing outside diameter circle of inner diameter of. Gasket face to two parallel, when installation should be close to the shaft washer machine shoulder.

In the wide and narrow. When there is no and the original import bearing of a similar size substitution import bearings, can take change shaft neck or shell holes in the way, make its and the substitution import combined bearing. But shaft neck or aperture of manufactured cannot too big to avoid affect parts strength. The standard models of import bearing machine, try not to use this law.

 
Change the size of the shaft or housing holes. For the standard of obsolete import bearings, can take change shaft neck or shell holes in the way, make its and the substitution import combined bearing. But shaft neck or aperture of manufactured cannot too big to avoid affect parts strength. The standard models of import bearing machine, try not to use this law.
 



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