JPS62251515A - Dust cover for ball joint - Google Patents

Abstract

PURPOSE:To enable an object to be attached to another object in such a manner that both are brought into contact with tension, by providing a stiffening ring, which is able to expand easily for tensing force, to the inner peripheral surface of bead-shaped end parts of a dust cover in such a manner that both ring and cover become an integrated body. CONSTITUTION:A stiffening ring 17 made of synthetic resin is provided as an integrated body to the inner peripheral surfaces 15 and 15 of bead-shaped end parts 14 and 14 of a dust cover 9. Both sides of this stiffening ring 17 is provided with slits 18, which go through the thickness of the ring 17 and which run from one side toward the other in the axial direction. With this contrivance, when the dust cover 9 is attached to a socket 6, the inner diameter of the dust cover 9 can be expanded together with both bead-shaped end parts 14 and 14.

Description

[Detailed description of the invention] This invention relates to a dust cover of a pole joint used in an automobile suspension system, a steering system, etc., in the field of industrial application, and in particular, the opening end of the dust cover is rotatable relative to the object to be mounted. Regarding improvements to the attached dust cover.

2. Prior Art A dust cover for a ball joint of this type is disclosed in Japanese Utility Model Publication No. 41-4577, in which the beaded end of the dust cover is connected to a V-shaped urethane protective band attached to the outer periphery of the object to be attached. There is something clamped in the mold groove.

Problems to be Solved by the Invention (1) The above-mentioned conventional dust cover has a drawback in that the beaded end portion easily comes off from the fitting portion of the object to be attached.

In other words, if the beaded edge force is removed, the original sealing function cannot be obtained.

(2) Therefore, it is conceivable to provide a reinforcing ring integrally on the inner peripheral surface of the beaded end of the dust cover, but (a) the inner diameter of the beaded end cannot be expanded;
It becomes difficult to attach it to the object to be attached.

(b) If the inner diameter of the beaded end is forcibly expanded and installed, the necessary tightening force will not be obtained after installation, and sealing will not be possible.

Therefore, the present invention aims to solve the problems in Q) and (2) above.

Means for Solving the Problems (a) A reinforcing ring made of synthetic resin is integrally provided on the inner peripheral surface of the beaded end of the dust cover.

(b) The reinforcing ring is provided with slits extending from one axial end to the other end on both sides of the axial end.

Effect: The inner diameter of the beaded end to which the reinforcing ring is attached can be easily expanded against the tightening force of the reinforcing ring.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a Tahole joint 1 fitted with a dust cover 9 according to the invention. In the figure, 2 is a ball stud consisting of a handle 3 and a spherical head 4, 5 is an upper bearing, and 6 is a socket.

The dust cover 9 is made of rubber or urethane, for example.

It is approximately bell-shaped and made of elastic material such as urethane foam.
Small openings 11i at both ends of the membrane body 10? and large opening 1
It has 2. An annular coil spring 16 is embedded within this large opening 12.

An annular groove 8 is formed on the outer peripheral surface of the socket 6, and is set so that a beaded end 14 on the large opening 12 side of the dust cover 9 fits therein.

The inner peripheral surface 15 of the beaded end portions 14, 14 of the dust cover 9.
15 is provided with one reinforcing ring 17 made of synthetic resin. This reinforcing ring 17 includes, as shown enlarged in FIG.
A slit 18 extending from one end in the axial direction to the other end is formed through the thickness of the plate on both sides. Therefore, dust cover 9
When installed in the socket 6, the inner diameter can be expanded together with the beaded ends 14, 14.

Next, the operation of the dust cover 9 will be explained.

FIG. 2 shows a state in which the ball stud 2 is tilted. As shown in FIG. 2, the membrane body 10 of the dust cover 9 is greatly curved on the side where the ball stud 2 is tilted.
The other side has a gentle curve. As mentioned above, the beaded end 14 on the small opening 11 side and the beaded end 14 on the large opening (II 12) are fitted into the annular groove 8 of the handle 3 and socket 6 of the ball stud, respectively. Therefore, it slides around the rotation center 0,0.At that point, the reinforcing rings 17,1
7 has excellent lubricity and can slide smoothly on the handle 3 of the ball stud 2 and the annular groove 8 of the socket 6.

Effects As described above, according to the present invention, the reinforcing ring force; the inner diameter of the attached beaded end can be easily expanded against the tightening force of the reinforcing ring. A dust cover having a reinforcing ring integrally formed on the inner circumferential surface of the shaped end can be attached to an object. Moreover, after mounting, the reinforcing ring brings the reinforcing ring into close contact with the outer periphery of the object to be mounted, thereby ensuring a secure seal.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and is a cross-sectional plan view of a ball joint. FIG. 2 is a cross-sectional plan view showing a state in which the ball stud of the ball joint shown in FIG. 1 is tilted. 8th
The figure is a perspective view showing a reinforcing ring provided integrally with the dust cover of the present invention. (Explanation of symbols) 1...Ball joint. 2...
ball stud. a ・−・−・・Handle 4・・−・・Ball
shape head. 6...So. 9...Dust cover. 11...Small opening. 12...
・Large opening. 14--・-・Beaded end. 15...Inner peripheral surface. 17...Reinforcement ring. 18・-・・
...Slit.

Claims (1)

[Claims] A small opening 11 is attached at one end to the handle 3 of a ball stud 2 with a handle having a spherical head 4 at the tip, and a small opening 11 is attached at one end to the outer periphery of a socket 6 from which the handle 3 of the ball stud 2 projects. Dust cover 9 made of elastic material and equipped with a large opening 12
(a) A reinforcing ring 17 made of synthetic resin is integrally provided on the inner peripheral surface 15 of the beaded end 14 of the dust cover 9, and (b) the reinforcing ring 1
7, a dust cover for a ball joint characterized in that slits 18 extending from one axial end to the other end are provided on both sides of the axial end.