Deep groove ball bearing installation method

A, press fit

The inner ring of the bearing is tightly fitted with the shaft. When the outer ring and the bearing housing hole are loosely fitted, the bearing can be pressed on the shaft by the press, and then the shaft is fitted into the bearing housing hole together with the bearing. On the end face of the inner ring of the bearing during press-fit, a mounting sleeve made of soft metal material is “copper or mild steel”. The inner diameter of the fitting sleeve should be slightly larger than the diameter of the journal, and the outer diameter should be slightly smaller than the inner ring of the bearing to avoid pressing on the cage. The bearing outer ring and the bearing housing hole are tightly matched. When the inner ring and the shaft are loosely fitted, the bearing can be first pressed into the bearing housing hole, and the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the housing hole. If the bearing ring is tightly fitted with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time during installation. The structure of the assembly sleeve should be able to simultaneously press the end faces of the inner ring and the outer ring of the bearing.

B, heating coordination

By heating the bearing or housing, the thermal expansion is used to transform the tight fit into a loose fit installation method. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before hot loading, put the bearing or the detachable bearing ferrule into the fuel tank and heat it evenly at 80~100°C, then remove it from the oil and install it on the shaft as soon as possible. To prevent the inner ring end face and the shoulder from sticking tightly after cooling, The bearings can be axially tightened after cooling. When the outer ring of the bearing is tightly fitted with the bearing made of light metal, the hot-filling method of the heated bearing seat can avoid the abrasion of the mating surface. When heating the bearing with the fuel tank, apply a grid at a certain distance from the bottom of the box, or use a hook to hang the bearing. The bearing should not be placed on the bottom of the box to prevent precipitation impurities from entering the bearing or uneven heating. There must be a thermometer in the tank. Strictly control the oil temperature should not exceed 100 ° C to prevent the back effect, so that the hardness of the ferrule is reduced.