How to install needle roller bearings

1. Install full-load needle roller bearings, generally using auxiliary sleeves. The auxiliary roller or auxiliary sleeve holds the needle without causing the needle to fall out. The journal picks up the needle with its own chamfer. As the needle bearing moves slowly inward on the journal, the auxiliary roller or auxiliary sleeve The tube slowly exits until it is placed in the working position. The outer diameter of the auxiliary roller and the auxiliary sleeve should be 0.1-0.3 mm smaller than the shaft diameter.

2. The needle bearing can also be installed by applying a thin layer of lubricating oil to the outer diameter of the auxiliary sleeve and inserting the outer ring of the bearing so that the auxiliary sleeve and the outer ring of the bearing form an annular hole, and then the needle is placed in the annular hole. . After loading the needle roller, push the auxiliary sleeve out with the working shaft.

3. For needle roller bearings without inner ring or without outer ring, when installing, first apply a thin layer of grease to the rolling surface of the shaft or housing hole, and put the needles in close contact with the grease on the installation site. . A gap should be left when the last needle is placed. The size of the gap is preferably 0.5 mm on the circumference of the needle bearing.

4. For needle roller bearings with only the outer ring, since the outer ring wall is very thin, do not hit it with a hammer, and press it with a press. Because the pressure is not uniform when the hammer is struck, it is easy to cause local deformation of the outer ring of the needle bearing.
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