JPH0776263A - Ball joint part structure - Google Patents

Abstract

PURPOSE:To improve the installation workability, prevent the seal disorder due to deformation, and prevent the intrusion of water. CONSTITUTION:Concerning a ball joint structure in which a spherical ball pin 20 is projectingly installed from a pivot arm 1, and a nearly ring-shaped ball retainer 4 is fitted in a slidable manner on the ball pin 20, and a link 2 is installed nearly in parallel to the pivot arm 1 on the ball retainer 4, and both members are connected in a turnable manner, a lower side grease reservoir 6 is formed by installing a lower side ball retainer seal 5 between the surface on the projection installation side of the ball pin 20 of the pivot arm 1 and the ball retainer 4. Further, a fitting hole 20c is formed at the part on the opposite side to the pivot arm 1 of the ball pin 20, and a clip 21 which is fitted in a revolution-disabled state is installed in the fitting hole 20c, and a seal rubber 22 is installed integrally with the clip 21, and the end part of the seal rubber 22 is brought into contact with the ball retainer 4, and an upper side grease reservoir 23 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball joint structure for rotatably connecting two members.

[0002]

2. Description of the Related Art Conventionally, as this type, there is one provided in a link mechanism of a wiper device of an automobile (see FIG. 4). In the figure, reference numeral 1 is a pivot arm fixed to a pivot shaft (not shown), reference numeral 2 is a link connected to a drive source (not shown), and the pivot arm 1 and the link 2 are connected by a ball joint as follows. ing.

That is, a spherical ball pin 3 is provided on the pivot arm 1 so as to project upward, and an annular ball retainer 4 made of resin is slidably fitted to the ball pin 3. . The link 2 is attached to the ball retainer 4.

On the lower side of the link 2, a rubber lower ball retainer seal 5 is arranged between the pivot arm 1 and the ball retainer 4 to form a lower grease reservoir 6. The lower grease reservoir 6 is filled with grease.

Further, on the upper side of the link 2, an upper ball retainer seal 7 made of rubber is attached by a spacer 8, a washer 9, a spring washer 10, a screw 11 and the like. The upper ball retainer seal 7 forms an upper grease reservoir 12, and the upper grease reservoir 12 is filled with grease.

[0006] As this kind of thing, there is known one described in Sankaido Publishing Automotive Engineering Complete Book 10, "Electrical Equipment, Body Equipment, Engine Parts", page 131 and the like.

[0007]

However, in such a conventional device, the workability is poor because the upper ball retainer seal 7 and the like are attached by the screw 11. Also, the upper ball retainer seal 7 may also rotate when screwing with the screw 11,
Due to this rotation, the seal 7 is deformed and cannot be mounted in a proper posture, which may cause a seal defect. Further, water may enter the upper grease reservoir 12 through the gap between the washer 9 and the like.

[0008] Therefore, an object of the present invention is to provide a ball joint structure for improving mounting workability, preventing seal failure due to deformation, and preventing water from entering.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. A spherical ball pin is projected from one member, and a substantially ring-shaped ball retainer slides on the ball pin. In a ball joint structure for rotatably connecting both members by movably fitting them and attaching the other member to the ball retainer substantially parallel to the one member, the ball of the one member A ball retainer seal is provided between the surface on the pin protruding side and the ball retainer to form a grease reservoir,
A fitting hole is formed in a portion of the ball pin opposite to the one member, a clip is fitted into the fitting hole in a non-rotatable state, and a seal rubber is provided integrally with the clip. The ball joint structure is characterized in that an end portion is brought into contact with the ball retainer to form a grease reservoir.

[0010]

[Operation] According to such means, since the seal rubber is attached by fitting the clip into the fitting hole of the ball pin, the mounting workability can be improved. In addition, this attachment is not a screwing operation, and the seal rubber is not rotated, so that unlike the conventional case, there is no possibility of inadvertently deforming and causing a seal defect. Further, in the mounted state, the seal rubber and the clip can be integrated, so that the watertightness is good, and it is possible to prevent water from entering from between the screw and the washer as in the conventional case.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention. The same or equivalent members as the conventional ones will be described with the same reference numerals.

First, the structure will be described. In the figure, reference numeral 1 is a pivot arm as "one member" fixed to a pivot shaft (not shown), and reference numeral 2 is "other member" connected to a drive source (not shown). The pivot arm 1 and the link 2 are connected by a ball joint as follows.

That is, a spherical ball pin 20 is provided on the pivot arm 1 so as to project upward, and an annular ball retainer 4 is slidably fitted to the ball pin 20. The link 2 is attached to the ball retainer 4.

Below the link 2, a ball retainer seal 5 is provided between the pivot arm 1 and the ball retainer 4 to form a lower grease reservoir 6, and the lower grease reservoir 6 is formed. It is filled with grease.

Further, on the upper side of the link 2, a seal rubber 22 is attached by a clip 21.
Specifically, the upper surface portion 20b of the upper portion 20a of the ball pin 20
A square fitting hole 20c is formed in the fitting hole 2c.
The leg portion 21a of the clip 21 is inserted into 0c so that the locking piece 21b formed on the leg portion 21a is locked. In this locked state, since the opening 3c has a quadrangular shape, the leg 21a is in a non-rotatable state. The head 21c of the clip 21 also has a rectangular shape.

The seal rubber 22 has a circular horizontal cross section, and a recess 22a into which the head 21c of the clip 21 is fitted is formed in the upper portion of the seal rubber 22.
An insertion hole 22b into which the leg portion 21a of the clip 21 is inserted is formed in the bottom portion of a. Further, a skirt portion 22c is formed around the seal rubber 22, and a tip portion of the skirt portion 22c is in sliding contact with the ball retainer 4. As a result, the upper grease reservoir 23 is formed.

Furthermore, the seal rubber 22 has
A guide lip portion 22d whose lower end portion abuts on a retainer retaining protrusion 20d formed on the ball pin upper portion 20a is formed.

Next, the operation will be described.

With the clip 21 attached to the seal rubber 22 and integrated, the leg portion 21a of the clip 21 is inserted into the fitting hole 20c of the ball pin, and the locking piece 12b is fitted around the fitting hole 20c. Lock to the part. Clip 2 like this
Since it can be attached with one touch by 1, the attaching workability is improved as compared with the conventional case. In addition, since the seal rubber 22 is not rotated at the time of this attachment because it is not screwed, there is no possibility of inadvertently deforming and causing a seal defect as in the conventional case. Moreover, at the time of this attachment, the guide lip portion 22d is attached to the ball pin 20
Since it is guided by the upper part 20a of the, the mountability is further improved.

Further, in the mounted state, the seal rubber 22 and the clip 21 can be integrated, so that the watertightness is good, and water enters from between the screw 11 and the washer 9 as in the conventional case. Can be prevented.

Further, since the leg portion 21a of the clip 21 is fitted into the square fitting hole 20c and is in a non-rotatable state, a defective seal can be prevented.

Further, the guide lip portion 22d of the seal rubber 22 is provided with the retainer retaining projection 2 of the ball pin 20.
Since it abuts on 0d, it is possible to prevent the seal rubber 22 from tilting when the seal rubber 22 is attached. Further, due to the contact, this part is sealed and water can be prevented from entering the upper grease reservoir 23.

[0024]

As described above, according to the present invention, since the seal rubber is attached by using the clip, the attachment workability can be improved. Further, at the time of this attachment, since the screw is not screwed, the seal rubber is not rotated, and therefore, unlike the conventional case, there is no possibility that the seal rubber is inadvertently deformed to cause a seal defect. In addition, in the mounted state, the seal rubber and the clip can be integrated so that the watertightness is good,
It has a practically useful effect that water can be prevented from entering between the screw and the washer as in the conventional case.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a clip and a ball pin showing the same embodiment.

FIG. 3 is a plan view of FIG. 3 showing the same embodiment.

FIG. 4 is a sectional view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 1 Vivot arm (one member) 2 Link (other member) 4 Ball retainer 5 Ball retainer seal 6 Lower grease reservoir (grease reservoir) 20 Ball pin 20c Fitting hole 21 Clip 22 Seal rubber 23 Upper grease reservoir (grease reservoir) )

Claims (1)

[Claims] 1. A spherical ball pin is projected from one member, and a substantially ring-shaped ball retainer is slidably fitted to the ball pin, and the ball retainer is substantially parallel to the one member. By attaching the other member,
In a ball joint structure for rotatably connecting the two members, a ball retainer seal is provided between a surface of the one member on a ball pin projecting side and the ball retainer to form a grease reservoir. In addition, a fitting hole is formed in a portion of the ball pin opposite to the one member, a clip is fitted into the fitting hole in a non-rotatable state, and a seal rubber is provided integrally with the clip, A ball joint structure, characterized in that an end of rubber is brought into contact with the ball retainer to form a grease reservoir.