JPH0214651Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the improvement of ball joints, and more specifically, to prevent cracks caused by external factors in the dust cover, which is a component of the joint, to improve durability, and to improve the durability of the dust cover, which is a component of the joint. The purpose is to reduce the amount of grease used.

BACKGROUND ART Conventionally, a ball joint shown in FIG. 1 has been known as a ball joint used in automobiles and various agricultural machines. That is, a spherical part 2a is formed integrally with one end of a ball stud 2 in an internal chamber 1b which is bored at the upper end in the figure of a metal socket 1 which is a joint base and has an opening 1a at one end.
is inserted through the support ring 3 having a spherical inner circumferential surface to prevent the ball stud 2 from being pulled out in the axial direction, and to prevent rotation in the circumferential direction and the spherical part 2.
In order to perform a predetermined rocking movement with a as the base end and to prevent dust from entering the moving part, it is made of a flexible material and has a substantially bowl shape, and the ball is attached to the curved bottom part. A dust cover 4, which has a shaft hole 4a inserted through the stud 2, has an open end 4b with a metal ring 5 inserted therethrough, and is fitted into the circumferential groove 1c of the socket 1, thereby smoothing the movement of the ball stud 2 therein. Grease (not shown) that performs a lubricating action is sealed in an amount equal to or more than 1/2 of the internal volume of the dust cover 4. A connecting ring 6 is connected to the ball stud 2 by a nut 7 screwed onto a male thread at the other end of the ball stud 2.

In the ball joint with the above configuration, the dust cover 4 made of an elastic flexible material is constantly exposed to external objects (drops during transportation, contact, flying stones in the actual machine, etc.) from the installation process to transportation and use of the actual machine. ), etc., and due to this contact, it is easily deformed and compressed (bitten) between the external object and the socket 1 and ball stud 2, causing damage such as cracks in the compressed part. , the grease inside the dust cover 4 may leak, or the dust cover 4 may
Dust and water may enter the ball stud 2.
This may hinder the smooth rotation and rocking movement of the In addition, when the ball joint is used in an actual machine, it swings as shown in FIG. The interference between the dust cover 4 and the socket 1 may cause wear or cracks, which may shorten the life of the dust cover 4.

In view of the drawbacks of the prior art described above, the ball joint of the present invention has a sponge-like elastic member inserted into the dust cover, so that the ball joint of the present invention is provided with The dust cover is configured to maintain its function over a long period of time without causing damage or interference wear to the dust cover by utilizing the buffering effect caused by compressive deformation of the sponge-like elastic member.

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 3, the above-mentioned Fig. 1 and 2
The same reference numerals as in the drawings indicate the same members, and a ring-shaped sponge-like elastic member 8 is inserted into the dust cover 4 together with grease.

As shown in FIG. 4, this sponge-like elastic member 8 has a cushioning effect that prevents the dust cover from deforming even when the dust cover 4 is deformed due to contact with an external object or rocking motion during use of the actual machine. This prevents excessive deformation of the dust cover 4 and prevents cracks and interference wear from occurring in the dust cover 4. At the same time, in order to take up space within the dust cover 4 according to its size, This will reduce the amount of grease that can be accommodated.

As explained above, the ball joint of the present invention has a simple structure in which a sponge-like elastic material is inserted into the dust cover made of a flexible material, thereby preventing the dust cover from being damaged or worn out. In addition, the amount of grease contained in the dust cover can be reduced, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional ball joint, FIG. 2 is a sectional view showing the same operating state, FIG. 3 is a sectional view showing a ball joint according to an embodiment of the present invention, and FIG. It is a sectional view showing the same operating state. DESCRIPTION OF SYMBOLS 1... Socket, 1a... Opening, 1b... Internal chamber, 1c... Peripheral groove, 2... Ball stud, 2a... Spherical part, 3... Support ring, 4... Dust cover, 4a... Shaft hole, 4b...open end, 5...
...Metal ring, 8...Sponge-like elastic member.

Claims (1)

[Scope of utility model registration request] A spherical part of a ball stud is rotatably fitted into an internal chamber bored in the socket and having an opening at one end, and the ball stud is inserted through a curved bottom part of the socket having a substantially bowl-shaped peripheral edge. In this ball joint, an end portion of a dust cover made of a flexible material having a shaft hole is fitted, and grease is sealed in the dust cover, and a sponge-like elastic member is contained inside the dust cover together with the grease. A ball joint characterized by being interpolated.