Sealed cover press-installing device of railway truck bearing

Abstract

The invention discloses a sealed cover press-installing device of a railway truck bearing. The device is a sleeve-like structural component with a cylindrical outer circumference surface, and comprises an upper guiding section and a lower installation section, wherein the diameter of the inner circumference surface of the guiding section is small, the diameter of the inner circumference surface of the installation section is large, and a step surface is transited between the inner circumference surface of the guiding section and the inner circumference surface of the installation section, and the length of the installation section is one fifth of the length of the whole press-installing device; the inner circumference surface of the guiding section comprises an upper reshaping surface and a lower leading surface, wherein the reshaping surface is a circular conical surface of which the upper diameter is small and the lower diameter is large, the leading surface is a cylindrical surface, and the diameter of the leading surface is larger than the diameter of an upper tooth port of an outer ring of the bearing by 0.27-0.63mm; and the diameter of the inner circumference surface of the installation section is larger than the diameter of the outer ring of the bearing by 0.22-0.59mm. The press-installing device disclosed by the invention can avoid a phenomenon that when a sealed cover is in press installing, a boss of the sealed cover is subjected to edge cutting.

Description

technical field [0001] The invention relates to a manufacturing and maintenance device for bearings, in particular to a press-fitting device for a sealing cover of a railway wagon bearing. Background technique [0002] The structure of commonly used railway wagon bearings is a double-row tapered roller bearing (see Figure 1 to Figure 4 ), including bearing outer ring 11, bearing inner ring 12, spacer ring 13 and sealing assembly 14, the general models are 353130X2-2RZ, 353130A, 352226X2-2RZ, they are important components on railway wagons, their performance is good or bad It directly affects the improvement of the speed of railway wagons and the safety of operation. Since the 1980s, the fault caused by the looseness of the sealing cover is the first inertial fault among the faults of the railway freight car bearings, and has been plagued by the manufacturing enterprises of the railway freight car bearings and the railway freight car depots. Although with the development of...

AI Technical Summary

Problems solved by technology

[0003] The first is the cause of size fit. The interference fit between the tooth mouth 110 on the inner peripheral surface of the bearing outer ring 11 and the boss 210 on the seal cover 21 is too small to cause looseness, which causes the inner seal 21 in the seal cover 21 after the truck speeds up. 1. The friction between the outer sealing rings 23, 24 and the sealing seat 22 is intensified, thereby driving the sealing cover 21 to rotate together, and aggravating the loosening of the sealing cover 21;

[0004] The second is the reason for press-fitting. The seal cover 21 is directly put into the end face 111 of the bearing outer ring 11 for press-fitting. Since there is a distance of 0.8mm between the outer peripheral surface of the boss 210 of the seal cover 21 and the inner end face of the seal cover 21 × 0.4mm chamfer, there is no correct positioning and guidance during press-fitting, resulting in inclination, and the assembly accuracy depends on the labor quality of the workers, resulting in poor consistency of installation accuracy, causing the sealing cover 21 to enter the teeth of the bearing outer ring 11 At 110, the boss 210 on the sealing cover 21 has been partially trimmed

[0006] 1) Due to the uneven axial and radial rebound force of the sealing cover during the press-fitting process, the sealing cover will tilt and be out of axis with the axis of the outer ring of the bearing, resulting in the inner and outer sealing rings 23, The gap in the circumferential direction of 24 is uneven, and it is easy to generate heat due to friction between the inner and outer sealing rings 23 and 24;

[0007] 2) The bosses on the sealing cover should all enter the positioning groove 112 of the tooth mouth of the bearing outer ring to play the role of reverse locking. When the sealing cover is pressed, part of the bosses on the outer peripheral surface enter the positioning groove 112, and a part If there is no boss, it will cause the sealing cover to fall off due to uneven locking force and centrifugal force during high-speed operation, causing bearing failure

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