JP2592222Y2 - Dust cover for ball joint - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a dust cover for a ball joint.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a ball stud 21 having a knuckle arm 22 and a socket 23 are provided.
And a ball joint dust cover in which grease (not shown) is sealed, a substantially lantern-shaped film portion 1 is provided, and a grease discharge port 2 is provided in the film portion 1. . The film portion 1 is formed of a rubber-like elastic material, and thus has flexibility to freely deform according to the swing of the ball stud 21. As shown in FIG. 6 and FIG. A single slit 5 is formed, and old grease is discharged from the slit 5 when grease is replaced.

[0003]

The above prior art has the following problems. That is, the dust cover expands before the grease is discharged from the grease discharge port 2 due to the increase in the internal pressure of the dust cover when discharging the grease, and as shown in FIG. May be pressed against the lower surface of the knuckle arm 22 and may be blocked, making it impossible to discharge grease.

[0004]

This invention SUMMARY OF THE INVENTION In view of the above points, which has been devised to solve the problems found in the prior art, in order to achieve this object, glyceryl the membrane unit
Source outlet is provided, and when the membrane part expands,
Where the grease outlet contacts the knuckle arm
In the dust cover for a ball joint provided with the grease outlet, the knuckle is provided in a part around the grease outlet instead of the grease outlet.
Provided is a dust cover for a ball joint, wherein a projection is provided for contacting an arm .

[0005]

[Function] A part of the grease around the grease discharge port
A projection that comes in contact with the knuckle arm is provided instead of the discharge port
When the grease is discharged, the protrusion contacts the knuckle arm when the film expands .
Ri grease outlet it is possible to prevent the contact with the knuckle arm, thereby the grease outlet Na
To prevent it from being blocked by the knuckle arm
It becomes possible.

[0006] However, in the case of providing the projection on the entire periphery of the grease outlet, Wataru around the grease outlet the entire circumference when the projection abuts on the lower surface of the knuckle arm supposed to exhibit a cyclic Therefore, even if the grease discharge port does not directly contact the lower surface of the knuckle arm, the grease cannot be discharged to the outside. In the present invention, the projection is provided on a part of the periphery of the grease discharge port in order to prevent such a disadvantage, and therefore, the projection is formed in a non-annular shape. The non-annular shape includes various shapes such as a dot, a line, an arc, and a substantially C-shape. The number of projections formed may be one or more.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings. The dust cover for a ball joint is mounted between a ball stud provided with a knuckle arm and a socket, and grease is sealed therein. A lantern-type membrane is provided, and a grease discharge port is provided in the membrane,
Further, it has the following configuration.

Namely, as shown in FIGS. 1 and 2,
One point-like projection 6 is provided on the outer surface of the membrane portion 1 next to the grease discharge port 2, and the protrusion 6 has a height higher than the bulge of the grease discharge port 2.

In another embodiment shown in FIGS. 3 and 4, an arc-shaped projection 7 is provided on the outer surface of the membrane portion 1 so as to surround the grease discharge port 2.
Also has a height higher than the bulge of the grease outlet 2.

[0010] Thus, according to the dust cover having such protrusions 6, 7, when the dust cover is inflated when discharging the grease, the projections 6 and 7 in contact with the lower surface of the knuckle arm grease The discharge port 2 can be prevented from pressing against the lower surface of the knuckle arm, and the grease can be reliably discharged to the outside from the gap formed between the grease discharge port 2 and the knuckle arm.

[0011]

[Effects of the Invention] The present invention has the following effects.

[0012] In other words, a part of the periphery of the grease discharge port
The knuckle arm instead of this grease outlet.
Because of the projections that touch,
When the membrane part expands, this projection causes the knuckle lure.
Grease outlet is knuckle lure
It is possible to prevent contact with the system. Accordingly
Grease outlet is blocked by the knuckle arm.
The grease can be prevented, and the grease can be reliably discharged from the grease discharge port to the outside.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a dust cover for a ball joint according to an embodiment of the present invention.

FIG. 2 is a view in the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view of a main part of a dust cover for a ball joint according to another embodiment of the present invention.

4 is a view in the direction of arrow B in FIG. 3;

FIG. 5 is a sectional view of a ball joint.

FIG. 6 is a sectional view of a main part of a ball joint dust cover according to a conventional example.

7 is a view in the direction of arrow C in FIG. 6;

FIG. 8 is a sectional view of a principal part showing the operation of the ball joint dust cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film part 2 Grease discharge port 3 Concave part 4 Thin part 5 Slit 6,7 Projection 21 Ball stud 22 Knuckle arm 23 Socket

Claims (1)

(57) [Scope of request for utility model registration] 1. A grease outlet (2) is provided in a membrane part (1).
When the membrane (1) expands.
Lease outlet (2) contacts knuckle arm (22)
That in the grease discharge opening (2) is provided with ball <br/> Lumpur joint dust cover position, a portion of the periphery of the grease outlet (2), the green
The knuckle arm (22) in place of the discharge outlet (2)
A dust cover for a ball joint, wherein projections (6) and (7) are provided for contacting the dust cover.