JP2573255Y2 - Sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device, and more particularly, to a sealing device with improved sealing at a grease outlet.

[0002]

2. Description of the Related Art Conventionally, ball joints as shown in FIGS. 6 and 7 are generally used for automobiles and agricultural machines.

That is, the ball joint includes a socket 52, a ball seal 53 made of an elastic material disposed inside the socket 52, and a ball stud 54 mounted on the ball seal 53 in a swingable manner. I have. A sealing device 51 is mounted around the ball stud 54 in order to prevent dust and the like from entering the sliding surface between the ball stud 54 and the ball seal 53.

[0004] The sealing device 51 has a substantially circular shape made of an elastic material.
One end of the cylindrical main body 51c and one end of the main body 51c are opened.
An annular seal thicker than the main body 51c provided on the body
The lip portion 51a and the opening at the other end of the main body portion 51c are integrally formed.
An annular mounting portion 51 thicker than the main body portion 51c provided
b. Seal lip part 51 of sealing device 51
a is mounted on the columnar portion 54a of the ball stud 54,
The mounting portion 51b is provided with a step 52 provided on the socket 52.
is mounted on a, the seal lip portion 51a 及 beauty mount 5
Reinforcing rings 56 and 57 are embedded in 1b, respectively.

Further, the outer circumferential surface of the main body portion 51c of the sealing device 51, as shown in FIGS. 8 to 11, provided such openings grease outlet 59 of a substantially U-shaped through the inside and outside, the grease discharge port 59 a raised part 58 enclose way is provided.

[0006] Grease is sealed between the sealing device 51 and the ball joint, the lubrication between the ball seal 53 and the ball stud 54 is maintained, and the ball stud 54 swings smoothly. .

As shown in FIG. 7, a groove 60 is provided in the spherical portion 54b of the ball stud 54. Grease is supplied by grease from the lower end of the socket 52, and the sealing device is inserted through the groove 60. Grease is supplied between the ball joint 51 and the ball joint.

When new grease is supplied, the pressure between the sealing device 51 and the ball joint increases,
The grease that has become old due to this pressure is removed from the grease outlet 5
9 to the outside.

Further, a raised portion 58 is provided so as to surround the grease outlet 59, and the grease outlet 59 is provided.
Are provided so that the grease discharge port 59 is not easily opened.

However, in the conventional sealing device 51 as described above, the raised portion 58 is provided to reinforce the peripheral portion of the grease outlet 59, but the portion provided with the grease outlet 59 is not provided. Main body of sealing device 51
51c wall thickness and the same or, for that also is formed in a thin-walled in order to ease Ku discharge the grease, ball stud 54
When the sealing device 51 is deformed by swinging, or when the pressure between the sealing device 51 and the ball joint increases when the ball stud 54 swings, the grease discharge port 59 is opened, and foreign matters such as muddy water are removed by the sealing device. There is a problem in that it invades between the ball joint 51 and the ball joint and shortens the life of the ball joint.

The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide a sealing device in which the grease outlet is not opened when the ball stud swings.

[0012]

The invention to achieve the above object In order to achieve the above, the socket and the ball seal disposed in the interior of the socket, a ball stud which is mounted pivotably on the ball seal Of a ball joint consisting of
A sealing device mounted between the socket and a ball stud, comprising: a cylindrical main body made of an elastic material;
Is provided integrally with one end opening of the
Annular seal lip to seal between
And, provided integrally with the other end opening of the main body,
An annular mounting portion for sealing between the socket and the main body;
Thicker than the body part that is provided integrally between the part and the mounting part
And the surface of the thick portion is connected to the surface of the mounting portion.
It is formed on a continuous surface and penetrates the inside and outside of the thick part.
A means provided with a grease discharge port through which the grease passes is adopted.

[0013]

[Function] This invention adopts the above-mentioned means,
This will increase the strength of the thick part with the grease outlet.
Therefore, the deformation caused by the swing of the ball joint
The outlet is not easily opened. Therefore, it is possible to prevent foreign substances such as muddy water from entering the inside from outside.
To extend the life of the ball joint
become.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 to 5 show an embodiment of the sealing device according to the present invention. FIG. 1 is a schematic sectional view showing a state where the sealing device is mounted on a ball joint. FIG. 2 shows an embodiment of the sealing device. FIG. 3 is a schematic cross-sectional view, and FIG.
4 is an enlarged cross-sectional view, and FIG.
FIG. 4 is a cross-sectional view taken along a line, and FIGS. 4 and 5 are schematic views of a thick portion and a grease discharge port from the outer peripheral side of the sealing device. The sealing device 1 is mounted on a ball joint.

The ball joint has a structure as shown in FIG. 1, that is, the ball joint has a socket 2, a ball seal 3 made of an elastic material provided inside the socket 2, and a ball A ball stud 4 on which a spherical portion 4b is slidably mounted on the seal 3 is provided.

A sealing device 1 is mounted around the ball stud 4 to prevent dust and the like from entering the sliding surface between the ball stud 4 and the ball seal 3.

As shown in FIG. 2, the sealing device 1 includes a substantially cylindrical main body 1c formed of an elastic material, and a main body 1c.
Thicker than main body 1c provided integrally with one end opening
Annular seal lip 1a and the other end opening of the main body 1c
Annular part thicker than the main body part 1c provided integrally with the part.
And a wearing portion 1b.

The sealing lip portion 1a of the sealing device 1 is mounted on the columnar portion 4a of the ball stud 4.
The mounting portion 1b of the sealing device 1 is mounted on a step portion 2a provided on the socket 2, and a knuckle arm 5 is disposed on a columnar portion 4a of the ball stud 4. Further, a reinforcing ring 6 is embedded in the seal lip portion 1a of the sealing device 1, and a reinforcing ring 7 is embedded in the mounting portion 1b.

As shown in FIGS. 3 to 5, a surface is mounted between the mounting portion 1b of the sealing device 1 and the main body 1c.
A main body 1c formed in a plane continuous with the surface of the portion 1b.
A thick, semicircular thick portion 8 having a thick wall is integrally formed.
The thick part 8 is provided with a grease discharge port 9 whose opening on the front side penetrating inside and outside has a substantially U-shape .

In the sealing device 1 according to the present invention constructed as described above, grease is sealed between the sealing device 1 and the ball joint, and the gap between the spherical portion 4b of the ball stud 4 and the ball seal 3 is formed. Is maintained, and the ball stud 4 swings smoothly.

The spherical portion 4 of the ball stud 4
b, a groove 10 is formed as in the conventional case, and grease is supplied from the lower end of the socket 2 by grease-up.
When new grease is supplied between the sealing device 1 and the ball joint through the groove 10, the pressure between the sealing device 1 and the ball joint increases, and the grease discharge port 9 is opened by this pressure to age. Grease is discharged from the grease discharge port 9.

Further, the grease discharge port 9 is connected to the sealing device 1.
The thick portion 8 penetrates, of the thick portion 8 sealing device 1 main body
Since the sealing device 1 is formed to be thicker than the portion 1c , even if the sealing device 1 is deformed when the ball stud 4 swings or the pressure of the sealing device 1 is slightly increased, the sealing device 1 may be deformed due to the elastic stress of the thick portion 8. The grease outlet 9 does not open easily.

Therefore, since foreign matters such as muddy water do not enter between the sealing device 1 and the ball joint, the durability of the ball joint is improved. The grease discharge port 9 penetrates through the thick portion 8 of the sealing device 1, and the thick portion 8
Is formed to be thicker than the other parts of the sealing device 1, the pressure at the time of press-fitting the grease is somewhat higher than in the past, but there is no problem in the work of press-fitting the grease.

[0024]

[Effect of the invention] The invention is constructed as described above ,
Between the part and the mounting part, the surface of which is continuous with the surface of the mounting part.
By forming a thicker portion thicker than the main body portion formed on the surface and providing a grease discharge port penetrating inside and outside the thick portion, the strength of the thick portion provided with the grease discharge port is increased.
You can do it. Therefore, the ball join
The grease discharge port is easily opened due to deformation
The grease outlet will not be easily opened even if the internal pressure increases slightly.
Therefore, ensure that foreign substances such as muddy water enter the inside from outside.
Can significantly reduce the durability of the ball joint
Can be enhanced. Also, the surface of the thick part
Since it is formed in a plane that is continuous with the surface of the mounting part,
To be able to take it out of the mold smoothly when it is shaped
Become. Therefore, the surface may be damaged when the mold is released.
We can provide stable and high quality products
It has excellent effects such as being able to be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a state in which a sealing device according to the present invention is mounted on a ball joint.

FIG. 2 is a schematic sectional view showing an embodiment of the sealing device according to the present invention.

FIG. 3 is a partially enlarged cross-sectional view in which a portion X in FIG. 2 is enlarged.

FIG. 4 is a right side view of FIG. 3;

FIG. 5 is a schematic view showing a portion of a grease outlet in the embodiment of the sealing device according to the present invention.

FIG. 6 is a schematic sectional view showing a state in which a conventional sealing device is mounted on a ball joint.

FIG. 7 is a partially enlarged sectional view of FIG. 6;

FIG. 8 is a schematic sectional view showing a conventional sealing device.

FIG. 9 is a partially enlarged cross-sectional view showing an enlarged Y portion in FIG. 8;

FIG. 10 is a right side view of FIG. 9;

FIG. 11 is a schematic view showing a portion of a grease discharge port in a conventional sealing device.

[Explanation of symbols]

 1, 51 ... sealing device 1a, 51a ... seal lip portion 1b, 51b ... mounting portion 1c, 51c ... body portion 2, 52 ... socket 2a, 52a ... step portion 3, 53 ... ball seal 4 ... 54 ball studs 4a, 54a ... columnar parts 4b, 54b ... spherical parts 5, 55 ... knuckle arms 6, 7, 56, 57 ... reinforcing rings 8 ... thick parts 9, 59 ... grease Discharge port 10, 60 ... groove 58 ... bulge

Claims (1)

(57) [Scope of request for utility model registration] 1. A socket (2), a ball seal (3) disposed inside the socket (2), and a ball stud (4) swingably mounted on the ball seal (3).
And the socket (2) of the ball joint
A sealing device to be mounted between the main body portion and the main body portion, the cylindrical body portion being made of an elastic material;
(1c) is provided integrally with one end opening, and
An annular seal for sealing between the ball stud (4)
At the opening of the other end of the main body (1c)
It is provided integrally with the socket (2).
An annular mounting part (1b) for sealing the main body, and a main body part (1c)
The main body (1) provided integrally with the mounting portion (1b)
a thicker portion (8) thicker than c).
The surface of (8) should be a plane that is continuous with the surface of the mounting part (1b).
Formed and penetrates inside and outside of the thick portion (8)
A sealing device comprising a grease outlet (9) .