An assembly method of a miniature standard rolling bearing crown cage

Abstract

The invention discloses a method for assembling a crown-shaped cage of a miniature standard rolling bearing, which belongs to the technical field of rolling bearing assembly. It adopts a special tooling to assemble the crown-shaped cage of a miniature standard rolling bearing. The special tooling includes a positioning column, and the middle part of the positioning column There is a circular stepped hole with a large diameter in the upper section and a small diameter in the lower section. The large diameter section and the steps in the upper part of the stepped hole are used to locate the outer ring of the bearing, and the small diameter section in the lower part of the stepped hole is provided with a positioning core coaxial with the positioning column Shaft, the upper part of the positioning mandrel is provided with a stop ring for placing the crown-shaped cage, the inner wall of the stop ring cooperates with the outer wall of the crown-shaped cage to position the crown-shaped cage, and the middle part of the positioning mandrel is provided with a bottom surface not higher than the step The blind hole on the end face of the hole step; this assembly method simultaneously positions the outer ring of the bearing and the crown-shaped cage to avoid sideways movement. During the press-fitting process, the bearing hardly tilts, and the force exerted by the steel ball on the crown-shaped cage Evenly, with a little force to complete the assembly.

Description

technical field [0001] The invention relates to the technical field of rolling bearing assembly, in particular to a method for assembling a miniature standard rolling bearing crown cage. Background technique [0002] The miniature standard rolling bearing in the present invention refers to the rolling bearing with the same height as the inner ring of the bearing and the outer ring of the bearing. Most of the crown-shaped cages used in the miniature standard rolling bearing are made of stainless steel. Distorted deformation occurs, and the ball pocket has a smooth contact surface with the steel ball after being pressed, so the starting torque or low-speed friction torque is small, the crown-shaped cage has high strength, and the speed range is wide. The crown-shaped cage used by the miniature standard rolling bearing in the present invention is made of 3Cr13 stainless steel strip, the thickness is only 0.1mm, and the specific shape is as follows figure 1 As shown, the inner ...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1. Since the cage has no circumferential or axial positioning in the plane of the base, there will be a certain offset in the cage during the pressing down process; 2. The thickness of the crown-shaped cage of the bearing is very thin, and it is easily deformed. Due to the skew of the bearing during the pressure application process, the steel ball exerts an uneven force on the crown-shaped cage, and the crown-shaped cage is deformed. Before the steel ball enters the pocket, the cage has a step down at the lock, and it cannot be used at all. The deformation is slightly lighter because the distance between the cage and the outer diameter of the inner ring of the bearing is only 0.04-0.12mm, so that the bearing After assembly, the rotation flexibility is poor, such as emergency stop and stagnation, etc., and the first-time assembly pass rate is only about 45%; 3. A large number of bearings with unqualified rotation flexibility need to remove the crown-shaped cage, wasting a lot of manpower and physical strength; the main difficulty in the assembly of this bearing is that the thickness of the crown-shaped cage is too thin, and the cage will be deformed when the force is uneven

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