JPS6283512A - Falling out preventing device for dust cover of ball joint - Google Patents

Abstract

PURPOSE:To prevent the small opening of a ball joint from falling out and improve the workability thereof, by forming a protrusion projecting in the inner circumferential direction of the socket side of the small opening away from the radial directional inner circumference of a reinforcing annulus, and contacting the protrusion adjacently to the fitting in portion side of a ball stud. CONSTITUTION:A ball stud 15 is formed by a shaft portion 16 and a ball-shaped head portion 17, a dust cover 20 is formed by an elastic material such as rubber, a reinforcing annulus 23 is embedded in a small opening 21 integrally, and a ridge 24 is formed in the radial directional inner circumferential position thereof. And the small opening 21 is provided with a protrusion 26 which engages with the side 28 of a fitting in portion 18. Thereby, the restoration of the dust cover 20 by resiliency is prevented. Therefore, the falling out of the small opening is prevented without changing restrictions such as an installation space, the oscillating angle of the stud and the like, so that the increase of the man-hours of installing works can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing the dust cover of a ball joint used in an automobile suspension system, steering system, etc. from falling off.

As a conventional technical ball joint dust cover falling-off prevention device, there is one shown in FIG. 3.

Problems to be Solved by the Invention The dust cover 20 is formed of an elastic material such as rubber, and the dust cover 20 has an axial height that changes from the free shape shown in FIG. 2 to the installed shape shown in FIG. Since it is attached to the socket 11 and the ball stud 15 in a compressed state, the dust cover small opening 21 is opened by its own repulsive force.
There is a problem that the stud may come off from the stud fitting portion 18.

This small opening 21 is likely to come off during transportation or assembly of the completed ball joint. The grease that was sealed in the
There is a problem that slipping occurs between the connecting member 7 and the connecting member (not shown).

In addition, in order to solve the above problem, it is possible to improve the fitting part 18 of the ball stud 15 to make the connection between the fitting part 18 and the dust cover small opening 21 stronger.
When installing a ball joint, there are restrictions on the dimensions of the fitting part due to space, stud swing angle, etc., so it has been required to take measures without changing these restrictions.

A means to solve the problem is to embed a reinforcing ring integrally in the small opening of the dust cover, and to protrude inwardly toward the socket side of the small opening away from the radially inner periphery of the reinforcing ring. is integrally formed, and its raised portion is engaged with a side surface of a cover fitting portion on the ball stud head side, which is formed with a large diameter in a portion of the handle of the ball stud.

The working raised portion comes into contact with the side surface of the ball stud fitting portion and prevents the dust cover from restoring due to the repulsive force.

Embodiments Hereinafter, the configuration of embodiments of the present invention will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the present invention (ball joint or pole joint based on ζ) 10. In the figure, 11 is a socket having a bearing member 13 on its inner periphery.

A ball stud 15 has a handle 16 and a spherical head 17 at the tip of the handle, and the head is supported by the inner spherical surface of the bearing member 13.

The upper opening 12 of the socket 11 allows the handle 16 of the ball stud to protrude, and the space around the opening is shielded from the outside by a dust cover 20.

The dust cover 20 is integrally molded from an elastic material such as rubber, and the upper small opening 21 is fitted into a predetermined position of the ball stud handle 16, and the lower large opening 22 is fitted into a groove around the socket 110. It is fitted.

In its free state, the dust cover 20 has an approximately bell shape as shown in FIG. 2, and has upper and lower openings 21.2.
A relatively thick cylindrical body portion 25 is provided between the dust cover and the dust cover so as to provide sufficient repulsive force when the dust cover is compressed in the axial direction.

A reinforcing ring 23 is integrally embedded in the small opening 21 of the dust cover 20, and a protrusion 24 is formed at the inner peripheral position of the reinforcing ring 23 in the radial direction.

This protrusion 24 is connected to the fitting part 18 of the ball stud handle part 16.
The groove 19 is formed in the groove 19 to determine the relative position of the ball stud and the small opening.

The large opening 21 of the dust cover 20 has its inner circumferential side adapted to the circumferential groove of the socket 11, and a circlip 14 is attached to the corresponding outer circumferential side to tighten the large core opening 22 to the socket 11. There is.

The fitting part 18 for the dust cover small opening 21 formed in the handle part 16 of the pole stand 15 has a larger diameter than the other shaft parts, so that a connecting member (not shown) is attached to the immersed part side. An end face 27 is provided to accommodate the.

The small opening 21 of the dust cover 20 has a fitting portion 18.
An annular raised portion 26 that engages with a side surface 28 on the head 17 side of the dust cover 20 to prevent the dust cover 20 from restoring due to repulsive force is integrally provided.

This raised portion 26 is reinforced to facilitate expansion of the inner diameter of the raised inner diameter side portion, which has an excess volume relative to the outer diameter of the fitted portion, when the dust cover small opening 21 is fitted into the fitting portion 18. It is formed at a position away from the radial inner circumference of the ring.

Therefore, when compressing the axial height of the dust cover 20 and fitting the small opening 21 into the fitting part 18, the raised part 2
6 is deformed and passes through the fitting part 18, and after passing, it is restored to its original shape and engages with the side surface 28 of the fitting part 18 on the head side.

Note that the force of the raised portion 26 to prevent the small dust cover opening 21 from coming off can be adjusted by the volume of the raised portion 26 and the tightening margin of the surrounding portion including the raised portion with respect to the fitting portion 18 .

Furthermore, since the raised portion 26 is made of an elastic material, it can also be used as a buffer member when the stand tilts relative to the socket 11 and the two come into contact.

Effects As described above, according to the present invention, the protrusion projecting in the inner circumferential direction on the socket side of the small opening separated from the radial inner circumference of the reinforcing ring comes into contact with the side surface of the ball stud fitting part. This prevents the dust cover from restoring due to the repulsive force, so the small opening in the dust cover can be installed without changing constraints such as space or stud swing angle. It is possible to prevent the ball stud from slipping out of the fitting part. Furthermore, since the reinforcing ring can be prevented from falling out of the small opening with the reinforcing ring buried in the small opening, the dust cover is easy to install and there is no increase in the number of steps for installing the dust cover.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and is a partially sectional plan view of a ball joint. FIG. 2 is a sectional view of the dust cover shown in FIG. 1 in a free state. FIG. 3 is a partially sectional plan view of a conventional ball joint. (Explanation of symbols) 10...Ball joint (Ball joint) 11...
···socket. 15...Ball stud. 16...
・Handle. 17...Head. 18... Insertion part. 20...Dust cover. 21・・・・・・
Small opening. 22...Large opening. 23...Supplementary
Strong ring. 26... Prominence. 28... Side.

Claims (1)

[Claims] A small opening in a dust cover 20 made of an elastic material such as rubber, which is attached to the socket 11 that holds the head 17 at the tip of the ball stud 15 and the handle 16 of the ball stud with its height compressed in the axial direction. A reinforcing ring 23 is integrally embedded in the reinforcing ring 23, and a raised part 26 protruding in the inner circumferential direction is integrally formed on the socket 11 side of the small opening 21 that is removed from the radial inner circumference of the reinforcing ring 23. A ball joint dust cover characterized in that a raised part 26 and a side surface 28 on the head 17 side of a cover fitting part 18 formed with a large diameter in a part of a handle part 16 of a ball stud 15 are engaged. Pull-out prevention device.