Dust cover for ball joint

摘要

An object of the invention is to provide a dust cover for a ball joint which can suppress generation of a so-called mouth opening phenomenon in a small-diameter opening portion even under a low-temperature atmosphere, can effectively inhibit a seal performance from being lowered in the small-diameter opening portion and inhibit the sedimentation or the garbage from entering into a dust cover from an external portion, and has a good sealing performance. For this purpose, in a dust cover for a ball joint having a spherical head portion, a shaft, one end large-diameter opening portion, the other end small-diameter portion, and a film portion, concavo-concave engagement is formed between an inner peripheral surface of the rigid ring and an outer peripheral surface of a retainer having a cylindrical portion which is fitted and retained to an outer peripheral surface of the shaft.

主权项

1. A ball joint comprising:
a spherical head portion formed in one end of a ball stud, the spherical head portion being retained within a socket; a shaft provided in the other end of said ball stud, the shaft being fastened and fixed to a knuckle; a dust cover including:
a one end large-diameter opening portion fixed and retained to an outer peripheral surface of said socket;the other end small-diameter portion having a rigid ring integrally formed therein, the other end small-diameter portion being retained to said shaft; anda film portion connecting said one end large-diameter opening portion and said other end small-diameter opening portion; and wherein the film portion is made of an elastic material wherein concavo-concave engagement is formed between an inner peripheral surface of said rigid ring and an outer peripheral surface of a retainer having a cylindrical portion which is fitted and retained to an outer peripheral surface of said shaft, the cylindrical portion including a convex bead that extends radially outward from the shaft, and the inner peripheral surface of the rigid ring including a concave recess that directly mates with the convex bead, and wherein said retainer is provided with a flange which extends outward in a radial direction from one end of the retainer.