JP2011099533A - Dust cover for ball joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust cover for a ball joint which prevents a film part from suffering from interference with a socket or knuckle and a small diameter opening part from slipping down to a spherical head part side. <P>SOLUTION: In a dust cover for the ball joint made of rubber-like elastic material where a spherical head part formed in one end of a ball stud is held in a socket, a shaft part at the other end of the ball stud is fastened and fixed to a knuckle, one end large diameter opening part is fixed and held on an outer peripheral surface of the socket, the other end small diameter opening part is held by the shaft part and a substantially drum-shaped film part overhanging to the outside to which the large diameter opening part and small diameter opening part are coupled, the dust cover is characterized in that a recessed part inwardly recessed is provided on the small diameter opening part side of the film part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a dust cover for a ball joint.
The present invention also relates to a ball joint dust cover used for an automobile suspension device, a steering device, and the like.

  Conventionally, a ball joint dust cover shown in FIG. 3 is known as a ball joint to which a dust cover is attached for the purpose of dust prevention and waterproofing of the ball joint joint. (Patent Documents 1 and 2)

In this type of ball joint dust cover sealing structure, as shown in FIGS. 4 and 5, a ball head 200 formed at one end of the ball stud 100 is held in a socket 300.
The shaft 400 at the other end of the ball stud 100 is fastened and fixed to the knuckle 500.
On the other hand, one end large-diameter opening 800 of the rubber elastic material dust cover 600 is fixedly held by the snap ring 900 on the outer peripheral surface of the socket 300, and the other end small-diameter opening 150 is held by the shaft 400. ing.
And the whole film | membrane part 700 which has connected the large diameter opening part 800 and the small diameter opening part 150 is exhibiting the drum shape which protruded outside.

In the conventional dust cover 600, when the ball stud 100 is inclined with respect to the socket 300, the shape of the compression-deformed film portion 700 located on the inclined side of the ball stud 100 is as shown in FIG. 4 or FIG. Deform.
That is, in the deformation shown in FIG. 4, the film part 700 interferes with the socket 300, causing a problem that the film part 700 is worn and damaged early.
In particular, such a tendency is remarkable in the type in which the gap between the knuckle 500 and the socket 300 is small.

  Further, in the deformation shown in FIG. 5, the film portion 700 is greatly deformed to the knuckle 500 side, and the risk that the film portion 700 interferes with the knuckle 500 is increased. There was a possibility of slipping.

Japanese Utility Model Publication No. 4-32313 JP 2004-92776 A

  The present invention has been made in view of such problems, and there is no risk that the membrane portion interferes with the socket or the knuckle, and there is no possibility that the small-diameter opening portion is displaced toward the ball head side. The purpose is to provide.

  In the dust cover for ball joint according to the present invention, a ball head formed at one end of the ball stud is held in the socket, and a shaft portion at the other end of the ball stud is fastened and fixed to a knuckle. Is fixedly held on the outer peripheral surface of the socket, the other end small-diameter opening portion is held on the shaft portion, and a substantially drum-shaped film projecting to the outside connecting the large-diameter opening and the small-diameter opening. In the dust cover for a ball joint made of rubber-like elastic material provided with a portion, a concave portion recessed inward is provided on the small-diameter opening side of the membrane portion.

The present invention has the following effects.
According to the dust cover for a ball joint according to the first aspect of the present invention, there is no risk that the film portion interferes with the socket or the knuckle, and there is no possibility that the small diameter opening portion is shifted to the ball head side.

Furthermore, according to the dust cover for a ball joint of the invention described in claim 2, the entire membrane portion can be smoothly deformed.
Furthermore, according to the dust cover for a ball joint of the invention as set forth in claim 3, it is possible to effectively avoid the risk that the small-diameter opening is displaced to the spherical head side.

  Furthermore, according to the dust cover for a ball joint of the invention described in claim 4, it is possible to reliably avoid the risk that the film portion interferes with the socket or the knuckle.

The longitudinal cross-sectional view of the dust cover for ball joints based on this invention. The longitudinal cross-sectional view which showed the dust cover for ball joints of FIG. The longitudinal cross-sectional view of the dust cover for ball joints based on a prior art. The longitudinal cross-sectional view which showed the state in which the dust cover for ball joints of FIG. 3 was integrated in the ball joint, and changed. The longitudinal cross-sectional view which showed the state which the dust cover for ball joints of FIG. 3 was integrated in the ball joint, and changed into the shape different from FIG.

Hereinafter, modes for carrying out the present invention will be described.
As shown in FIGS. 1 and 2, the ball joint dust cover according to the present invention has a ball head 2 formed at one end of a ball stud 1 held in a socket 3, The shaft portion 4 at the end is fixed to the ball joint fastened and fixed to the knuckle 5, one end of the large diameter opening 8 is fixed and held on the outer peripheral surface of the socket 3 by the snap ring 9, and the other end small diameter opening portion 15 is fixed to the shaft portion 4. It is configured to include a substantially drum-shaped film portion 7 that is held and projects to the outside connecting the large-diameter opening 8 and the small-diameter opening 15.
The film portion 7 is characterized in that a recessed portion 71 that is recessed inward is formed on the small-diameter opening 15 side.

The cross-sectional shape of the recess 71 is defined by an arc-shaped outer peripheral surface 711 and an arc-shaped inner peripheral surface 712 that are formed by an arc whose center is located outside the film portion 7.
As a result, as shown in FIG. 2, the shape of the compression-deformed film portion 7 located on the inclined side of the ball stud 1 is deformed into a shape projecting substantially perpendicular to the axial center of the socket 3. The danger that the film part 7 interferes with the socket 3 or the knuckle 5 can be avoided reliably.

Further, the arc-shaped outer peripheral surface 711 and the arc-shaped inner peripheral surface 712 are formed so as to continue from the small-diameter opening 15.
Accordingly, as in the prior art shown in FIG. 5, the film portion 700 is greatly deformed in the vicinity of the connecting portion between the small diameter opening 150 and the film portion 700, and there is a risk that the film portion 700 interferes with the knuckle 500. It can be avoided more reliably.

A metal reinforcement ring 151 is embedded in the small diameter opening 15.
The metal reinforcing ring 151 gives rigidity to the small-diameter opening 15 and prevents excessive deformation of the small-diameter opening 15 even when the inclination angle of the ball stud 1 with respect to the socket 3 is large (when the swing angle is large). ing.
In addition, a seal lip 152 that is in elastic contact with the outer peripheral surface of the shaft portion 15 is formed on the inner peripheral surface of the small diameter opening portion 15.
The seal lip 152 prevents the grease in the dust cover 6 from leaking to the outside.

Further, a dust seal 153 that is in elastic contact with the lower end surface of the knuckle 5 is formed on the upper end surface of the small-diameter opening 15.
The presence of the dust seal 153 can prevent water and earth and sand from entering the dust cover 6.
The dust cover 6 is formed of various rubber-like elastic materials.

  Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

  It can be used for ball joints used in automobile suspension systems and steering systems.

DESCRIPTION OF SYMBOLS 1 Ball stud 2 Ball head 3 Socket 4 Shaft part 5 Knuckle 6 Dust cover 7 Film | membrane part 8 Large diameter opening part 15 Small diameter opening part 71 Indentation part 711 outer peripheral surface 712 inner peripheral surface

Claims (4)

A ball head (2) formed at one end of the ball stud (1) is held in the socket (3),
The shaft (4) at the other end of the ball stud (1) is fastened and fixed to a knuckle (5), one end large-diameter opening (8) is fixedly held on the outer peripheral surface of the socket (3), and the other end has a small diameter. An open drum portion (15) is held by the shaft portion (4), and a substantially drum-shaped membrane portion projecting outwardly connecting the large-diameter opening portion (8) and the small-diameter opening portion (15) ( In the dust cover for ball joint made of rubber-like elastic material provided with 7), a recess (71) recessed inward is provided on the side of the small-diameter opening (15) of the membrane (7). Dust cover for ball joint.   An arcuate outer peripheral surface (711) and an arcuate inner peripheral surface (712), in which the cross-sectional shape of the hollow portion (71) is formed by an arc whose center is located outside the film portion (7), The ball joint dust cover according to claim 1, wherein the dust cover is divided by   The ball according to claim 2, wherein the arc-shaped outer peripheral surface (711) and the arc-shaped inner peripheral surface (712) are formed so as to continue from the small-diameter opening (15). Dust cover for joints.   The shape of the compression-deformed film part (7) located on the inclined side of the ball stud (1) is deformed into a shape projecting substantially perpendicular to the axial center of the socket (3). The dust cover for ball joints as described in any one of Claims 1-3.

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