Rolling bearing assembly
The rolling bearing has the advantages of small friction, small axial dimension, convenient replacement and simple maintenance.
(1) Technical requirements for assembly
1 The end face marked with the code for the rolling bearing should be mounted in the visible direction for correctness when replacing.
2 The radius of the arc at the step of the journal or housing hole should be smaller than the radius of the arc corresponding to the bearing.
3 After the bearing is assembled on the shaft and in the housing hole, there should be no skew.
4 In the two bearings that are coaxial, there must be an axis movement that occurs as the shaft expands.
5 When assembling rolling bearings, it is necessary to strictly prevent dirt from entering the bearings.
6 After assembly, the bearings must be flexible, low noise, and the working temperature should not exceed 65 °C.
(2) Assembly method
When assembling the bearing, the most basic requirement is to make the applied axial force directly on the end face of the ferrule of the mounted bearing (when mounted on the shaft, the applied axial force should directly act on the inner ring, When applied to the hole, the applied force is directly applied to the outer ring). Try not to affect the rolling elements. The assembly methods include hammering method, press assembly method, hot charging method, and freezing assembly method.
1 Hammering method
Use a hammer to place a copper rod and some soft materials and then hammer it. Be careful not to let foreign objects such as copper and copper fall into the bearing race. Do not directly hit the inner and outer rings of the bearing with a hammer or a punch, so as not to affect the bearing. Match the accuracy or cause damage to the bearing.
2 screw press or hydraulic press assembly method
For bearings with large interference tolerances, they can be assembled with a screw press or hydraulic press. Before the pressure, the shaft and the bearing should be leveled, and a little oil should be applied. 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 the shaft.
3 hot loading method
The hot-packing method is to heat the bearing to 80 °C-100 °C in the oil, so that the inner hole of the bearing is swollen and put on the shaft to prevent the shaft and the bearing from being damaged. For bearings with a dust cap and seal, the internal grease-filled bearing is not suitable for hot charging.
(3) The tapered roller bearing clearance is adjusted after assembly. The main method is to adjust the gasket, adjust with screws, adjust with nut, etc.
(4) When assembling the thrust ball bearing, the tight ring and the loose ring should be distinguished first. The diameter of the inner diameter of the tight ring is slightly smaller. The tight ring and the shaft after assembly are relatively static during operation. It always leans on the shaft. At the end of the step or hole, otherwise the bearing will lose its rolling action and accelerate wear.
Reprinted from the network