Rolling bearings have the advantages of low friction, small axial size, convenient replacement, and simple maintenance.

(1) Technical requirements for assembly

1. The end face of the rolling bearing marked with the code should be installed in the visible direction so that it can be checked when it is replaced.

2. The radius of the arc at the shaft diameter or the step of the housing hole should be smaller than the radius of the corresponding arc on the bearing.

3. After the bearing is assembled on the shaft and in the housing hole, there should be no skew.

4. Among the two coaxial bearings, one of the two bearings must move with the shaft when the shaft heats up.

5. When assembling the rolling bearing, it is necessary to strictly prevent dirt from entering the bearing.

6. After assembly, the bearing must run flexibly, with low noise, and the working temperature should generally not exceed 65 degrees.

(2) Assembly method

When assembling the bearing, the basic requirement is to make the added axial force directly act on the end face of the bearing ring (when installed on the shaft, the added axial force should directly act on the inner ring, which is installed on the inner ring. When the hole is on, the applied force should act directly on the outer ring).

Try not to affect the rolling elements. The assembly methods include hammering method, press assembly method, hot assembly method, freezing assembly method and so on.

1. Hammering method

Use a hammer to pad the copper rod and some softer materials before hammering. Be careful not to let foreign matter such as copper powder fall into the bearing raceway. Do not directly hit the inner and outer rings of the bearing with a hammer or punch, so as not to affect the bearing. The matching accuracy may cause bearing damage.

2. Screw press or hydraulic press assembly method

For bearings with larger interference tolerances, screw presses or hydraulic presses can be used for assembly. Before pressing, the shaft and bearing should be leveled, and a little lubricating oil should be applied. The pressure 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

The hot mounting method is to heat the bearing in oil to 80-100 degrees, so that the inner hole of the bearing is expanded and then set on the shaft, which can prevent the shaft and the bearing from being damaged. For bearings with dust caps and seals, which have been filled with grease, the hot mounting method is not applicable.

(3) The clearance of tapered roller bearings is adjusted after assembly. The main methods are adjustment with spacers, adjustment with screws, adjustment with nuts and so on.

(4) When assembling the thrust ball bearing, the tight ring and the loose ring should be separated first. The inner diameter of the tight ring is directly slightly smaller. The assembled tight ring and the shaft are kept relatively static when working, and it always leans against the shaft. At the end of the step or hole, otherwise the bearing will lose its rolling effect and accelerate wear.