JPH0337408A - Ball joint - Google Patents

Abstract

PURPOSE:To improve sealing property by providing a circumferential lip protruding in the bore direction of a ball joint closer to the center from the both ends in the axial direction of the inner circumferential surface of a dust cover large opening part. CONSTITUTION:On the inner circumferential surface 26 of the large opening part 25 of a dust cover 21, a circumferential lip 27 having an angular section is formed near the center in the axial direction, and made into contact with the bottom surface 9 of the dust cover channel 8 of a housing 6 by the bore directional fastening force of a cisclip 31. Thus, a high sealing property can be obtained by the bottom surface 9 and side surfaces 10, 11 of the dust cover channel 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to a ball joint used in, for example, automobile suspension systems and steering systems.

[Conventional technology]

As shown in the left half of FIG. 1, a ball joint in which the large opening 125 of the dust cover 121 is attached to the dust cover 121 having a substantially rectangular cross section formed on the outer periphery of the housing 106 is Many are known, such as No. 22845, JP-A-60-125468, and Utility Model Application No. 61-127931.

[Problem to be solved by the invention]

Conventionally, various efforts have been made to improve the sealing performance of ball joints, but the problem of the present invention is to improve the sealing performance between the dust cover and the housing, especially the sealing performance at the large opening of the dust cover. The object of the present invention is to provide a ball joint that can be improved.

Structure of the invention = [Means for solving the problem] A small opening at one end of the dust cover is attached to the outer circumference of the handle of the pole stud, a large opening at the other end is formed on the outer circumferential surface of the housing, and the interval between the side surfaces is as follows. In a ball joint that is attached to a circumferential dust cover groove that increases toward the outer diameter of the ball joint, and a circlip is attached to the outer periphery of the large opening of the dust cover, the inner peripheral surface of the large opening of the dust cover A circumferential lip that protrudes in the inner diameter direction of the ball joint is provided closer to the center than both ends in the axial direction.

[Examples and effects]

The configuration of an embodiment of the present invention will be explained below based on the drawings.

The right hand side of FIG. 1 shows a ball joint 1 according to an embodiment of the present invention, and FIG. 2 is an enlarged view of section A in FIG. 1.

In Figure 1, 2 is a ball stud with a ball head 4 at one end.
is slidably and rotatably supported in the housing 6 via a bearing 5, and the handle 3 at the other end protrudes from the opening 7 of the housing 6.

The dust cover 21 is made of an elastic material such as urethane and has a substantially cylindrical bell shape. The small opening 22 of this dust cover 21 is attached to the outer periphery of the handle 3 of the ball stud 2. A reinforcing ring 23 is integrally embedded in the small opening 22, and an outer circumferential knob 24 is formed on the outer periphery of the reinforcing ring 23 to seal between the reinforcing ring 23 and a connecting member 32 such as a knuckle arm. Further, the large opening 25 of the dust cover 21 is attached to a dust cover groove 8 formed on the outer circumference near the opening 7 of the housing 6, and a circlip 31 is attached to the outer circumference.
It is fixed to the ball joint l by attaching the. An intermediate portion between the large opening 25 and the small opening 22 is a body portion that bulges in the external direction.

The aforementioned dust cover groove 8 is circumferential and has a tapered shape in which the distance between the bottom surface 9 and the two mutually facing side surfaces 10.11 increases in the direction of the outer diameter of the ball joint. .

As shown in FIG. 2, two circumferential lips 27 are formed on the inner peripheral surface 26 of the large opening 25 of the dust cover 21 near the center in the axial direction. These circumferential lips 27 have a chevron-shaped cross section, and when the circlip 31 is tightened in the inner radial direction, the tip is compressed under force.
It is in contact with the bottom surface 9 of the dust cover groove 8 of the housing 6. As mentioned above, these circumferential lips 27 are not located at both ends in the axial direction of the inner circumferential surface 26 of the large opening 25 of the dust cover (but are located near the center), so the circlip 3
Tightening No. 1 will result in a large amount of force being applied.

Also, the side surface 10.1 of the dust cover groove 8 of the housing 6
1, since the tightening by the circlip 31 shown by the arrow in FIG. 2 is not parallel to the direction of the force P, a wedge action occurs,
Therefore, in sealing between the large opening 25 of the dust cover 21 and the dust cover groove 8 of the housing 6, high sealing performance can be obtained on both the bottom surface 9 and side surfaces 10, 11 of the dust cover groove 8.

In the first embodiment, two circumferential lips are provided on the inner peripheral surface of the large opening of the dust cover, but the number of circumferential lips may be any other number. Further, the angles of both side surfaces of the dust cover groove of the housing with respect to the bottom surface may be different from each other.

=Effects= As described below, according to the present invention, the small opening at one end of the dust cover is attached to the outer periphery of the handle of the pole stud, and the large opening at the other end is formed on the outer periphery of the housing. is attached to a circumferential dust cover groove that increases toward the outer diameter of the ball joint, and a circlip is attached to the outer circumference of the large opening of the dust cover. Since a circumferential lip that protrudes toward the inner diameter of the ball joint is provided closer to the center than both ends in the axial direction of the surface, high sealing performance with the large opening of the dust cover can be obtained at the bottom and side surfaces of the dust cover groove. As a result, the sealing performance between the dust cover and the housing can be improved.

[Brief explanation of drawings]

In Figure 1, the left half represents a conventional ball joint,
The right half is a partially sectional plan view showing a ball joint according to an embodiment of the present invention, and FIG. 2 is an enlarged view of section A in FIG. 1. (Explanation of symbols) 1. Ball joint. 2. ・Pole stud. 3. - Handle. 6. Housing. 8. -Dust cover groove. 10.11・・Side. 21. ・Dust cover 25. ・Large opening. 26. ・Inner peripheral surface. 27. - Circumferential lip. 31. ・Circlip.

Claims (1)

[Claims] A small opening 22 at one end of the dust cover 21 is attached to the outer periphery of the handle 3 of the ball stud 2, and a large opening 25 at the other end is
A circumferential dust cover groove 8 is formed on the outer circumferential surface of the housing 6, and the distance between the side surfaces 10 and 11 increases toward the outer diameter of the ball joint. In the ball joint 1 to which the clip 31 is attached, the dust cover 21
A ball joint characterized in that a circumferential lip 27 that protrudes in the inner diameter direction of the ball joint is provided closer to the center than both ends in the axial direction of the inner circumferential surface 26 of the large opening 25.