Dust cover for ball joint

Abstract

The objective of the present invention is to provide a dust cover for a ball joint which has good sealing performance at a small-diameter opening at the other end, and with which co-rotation of a plate member can be reliably prevented. In this dust cover for a ball joint, one end of a ball stud is held in a socket and the other end is secured by tightening, by means of a tightening means, a knuckle equipped with a notch part, a large-diameter opening at one end is affixed to and held on the socket side, a small-diameter opening on the other end is held on a shaft, and a plate member is held between the outer circumferential surface of the shaft and the inner circumferential surface of the knuckle on the small-diameter opening on the other end. This dust cover is configured such that the plate member is provided with an annular plate member, an annular seal part manufactured from a rubber-like elastic material and integrally formed on the inner circumferential side of the annular plate member, and an engaging protrusion that is manufactured from a rubber-like elastic material and engages the notch part on the knuckle-side surface of the annular plate member, with the annular seal part being compressed and held between the outer circumferential surface of the shaft and an annular step part provided on the inner circumferential surface of the knuckle.

Description

technical field [0001] The invention relates to a dustproof cover for a ball joint. [0002] In addition, the present invention relates to a dust cover for a ball joint used for an automobile suspension device, a steering device, and the like. Background technique [0003] At present, as a ball joint equipped with a dust cover for the purpose of dustproofing and waterproofing the joint of the ball joint, it is classified into Figure 5 The tapered alignment ball joint shown (テーパー合わせボールジョイント), and Figure 6 as well as Figure 7 Shown are both pinch bolt type ball joints. [0004] These two ball joints are mainly different in the fastening method of the steering knuckle and bolts. [0005] Figure 5 The shown conically aligned ball joint determines the position of the knuckle 500 where the conical surfaces of the shaft 400 of the ball stud 100 coincide. [0006] That is, since there is no gap between the surface of the shaft 400 and the knuckle 500, the dust lip 710 provid...

AI Technical Summary

Problems solved by technology

[0010] In particular, the gasket-shaped sealing member co-rotates with the rocking and rotating motion of the knuckle, reducing the sealing performance.

[0011] As a measure to prevent this co-rotation, it is proposed to provide a convex portion corresponding to the notch of the knuckle on the surface of the washer-shaped sealing member, but co-rotation cannot be completely prevented.

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