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Shanghai Shang Shaft Bearing Quality Inspection Institute Co., Ltd.

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Address: 301 Shangxue Road, Jiading District, Shanghai

Rolling bearing assembly method and technical requirements

2020-06-05 13:57

rolling bearingIt has the advantages of small friction, small axial size, convenient replacement and simple maintenance.

(1) Technical requirements for assembly

① The end face marked with the code of the rolling bearing shall be installed in the visible direction for checking when replacing.
② The arc radius at the step of the journal or housing hole should be smaller than the arc radius at the corresponding position on the bearing.
③ After the bearing is assembled on the shaft and the housing hole, there should be no skew.
④ In the two coaxial bearings, there must be one with the shaft thermal expansion when the shaft moves.
⑤ When assembling the rolling bearing, it is necessary to strictly prevent dirt from entering the bearing.
The bearing after assembly, must be flexible operation, low noise, working temperature generally should not exceed 65 ℃.

(2) Assembly method

When assembling a bearing, the most basic requirement is to make the added axial force directly act on the end surface of the ring of the installed bearing (when installed on the shaft, the added axial force must directly act on the inner ring, and when installed on the hole, the added force must directly act on the outer ring). Try not to affect the rolling body. The assembly method includes hammering method, press assembly method, hot loading method, freezing assembly method, etc.

① Hammering method

In the method of hammering copper rods and some soft materials with a hammer, care should be taken not to make foreign matters such as copper dust fall into the bearing raceway, and not to directly hit the inner and outer rings of the bearing with a hammer or punch cylinder, so as not to affect the matching accuracy of the bearing or cause damage to the bearing.

② Screw press or hydraulic press assembly method

For bearings with large interference tolerances, screw presses or hydraulic presses can be used for assembly. Before pressing, lay the shaft and bearing flat and apply a little lubricating oil. The pressing speed should not be too fast. After the bearing is in place, the pressure should be quickly removed to prevent damage to the bearing or shaft.

③ Hot loading method

Hot loading method is to heat the bearing in oil to 80 ℃-100 ℃, so that the inner hole of the bearing swell and then put it on the shaft, which can prevent the shaft and the bearing from being damaged. For bearings with dust caps and sealing rings, the hot-fitting method is not applicable for bearings that have been filled with grease inside.

(3)Tapered roller bearing clearance is adjusted after assembly, the main method is useful gasket adjustment, screw adjustment, nut adjustment, etc.

(4)When assembling the thrust ball bearing, the tight ring and the loose ring should be distinguished first. The inner diameter of the tight ring is slightly smaller. The assembled tight ring and the shaft remain relatively stationary during work, and it always leans against the step of the shaft Or at the end of the hole, otherwise the bearing will lose its rolling effect and accelerate wear.