JPH0643336U - Dust cover for ball joint - Google Patents

Abstract

(57) [Abstract] [Purpose] A dust cover 21 made of a rubber-like elastic material that is attached to a ball joint 1 that has a socket 3 and a ball stud 5 and that fixes the ball stud 5 to a knuckle arm 6 The purpose is to shorten the working time for attaching the cover 21 to the ball joint 1 and to reduce the filling amount of the grease 2. [Structure] An end face 3a of a socket 3 is attached to an annular base portion 22 mounted on the outer periphery of a ball stud 5 with a predetermined tightening margin.
An annular first seal portion 23 that presses against the end surface 6a of the knuckle arm 6 and an annular second seal portion 24 that presses against the end surface 6a of the knuckle arm 6 are integrally formed, and the dust cover 21 is provided between the socket 3 and the knuckle arm 6. Shall be sandwiched.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a dust cover for a ball joint.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a ball joint 1 shown in FIG. 2 is known as a ball joint 1 to be mounted on an automobile or an agricultural machine. A dust cover 11 made of a rubber-like elastic material is attached to the ball joint 1 in order to prevent dust from entering and prevent the grease 2 from leaking. The ball joint 1 has a socket 3 to which a ball stud 5 is swingably and rotatably connected via a ball seat 4. When mounted on an actual machine, the ball stud 5 is fixed to the knuckle arm 6 by tightening with the nut 7. The dust cover 11 has a film portion 12 having a substantially lantern shape. The film cover 12 is fitted to the outer periphery of the socket 3 and to the outer periphery of the ball stud 5. The annular second fitting portion 14 is formed integrally. An annular mounting groove 8 for fitting the first fitting portion 13 is formed on the outer peripheral surface of the socket 3, and the first fitting portion 13 is fitted in the mounting groove 8 to attach the band 15 to the band 15. It is designed to be tightened with. The second fitting portion 14 is provided with a lip-shaped seal portion 16 that comes into pressure contact with the end surface 6a of the knuckle arm 6, and the second fitting portion 14 has a reinforcing ring 17 embedded therein.

[0003]

[Problems to be solved by the device]

 The above conventional technique has the following problems. When the ball joint 1 is manufactured, the mounting groove 8 has to be formed on the outer peripheral surface of the socket 3, so that its processing is troublesome. When attaching the dust cover 11 to the ball joint 1, the dust cover 11 should be externally attached to the ball stud 5, the first fitting portion 13 should be fitted into the fitting groove 8, and the band 15 should be fitted further. It takes time because it has to be done. Since the band 15 is necessary, the cost is high. Since the dust cover 11 has the substantially lantern-shaped film portion 12, the dust cover 11 has a large content area. Therefore, a large amount of grease 2 must be filled inside the dust cover 11.

[0004]

[Means for Solving the Problems]

 In view of the above points, the present invention has been devised in order to solve the problems found in the above-mentioned prior art, and in order to achieve this object, it has a socket and a ball stud, and the ball stud is In a dust cover made of a rubber-like elastic material that is attached to a ball joint that is fixed to a knuckle arm, an annular base portion that is attached to the outer periphery of the ball stud with a predetermined tightening margin, and the base portion that is integrally formed with the socket base. Dust for ball joints, characterized in that it has an annular first seal portion that is pressed against the end surface of the knuckle, and an annular second seal portion that is integrally molded with the base portion and that is pressed against the end surface of the knuckle arm. Provide a cover.

[0005]

[Action]

 The dust cover for a ball joint according to the present invention having the above-mentioned structure is provided on the end surface of the knuckle arm and the annular first seal portion which is pressed against the end surface of the socket on the annular base portion which is mounted on the outer periphery of the ball stud with a predetermined tightening margin. It is an integrally molded annular second seal portion that is pressed against the surface, and is mounted so that it is sandwiched between the socket and the knuckle arm simply by externally inserting the dust cover onto the ball stud.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a state in which the dust cover 21 is attached to the ball joint 1. The ball joint 1 is different from the related art in that the mounting groove is not formed on the outer peripheral surface of the socket 3, but the other configurations are the same as the related art. Therefore, the dust cover 21 is an annular base portion 22 mounted on the outer periphery of the ball stud 5 with a predetermined tightening margin, and an annular base portion 22 which is integrally molded with the base portion 22 and is in pressure contact with the end face (top face in the figure) 3a of the socket 3. A first seal portion 23 and an annular second seal portion 24 which is integrally molded with the base portion 22 and is in pressure contact with the end surface (upper and lower surfaces in the figure) 6a of the knuckle arm 6. It is formed in a substantially V-shaped constriction, and the socket 3 and the knuckle arm 6 can be simply attached by externally attaching the dust cover 21 to the ball stud 5 before fixing the ball stud 5 to the knuckle arm 6. It is mounted in the state of being compressed in the axial direction. Further, when the ball stud 5 swings and the distance between the socket 3 and the knuckle arm 6 expands at one place on the circumference around the ball stud 5, the dust cover 21 has sealing portions 23, 24 at this portion. The length in the axial direction is determined so as not to separate from the end faces 3a and 6a.

The dust cover 21 having the above structure has the following effects. When attaching the dust cover 21 to the ball joint 1, it is only necessary to externally attach the dust cover 21 to the ball stud 5. After that, when the ball stud 5 is fixed to the knuckle arm 6 when the ball joint 1 is mounted on an actual machine, the dust cover 21 is sandwiched between the socket 3 and the knuckle arm 6 and compressed in the axial direction. It becomes a state. Therefore, according to the dust cover 21, first of all, the working time for mounting the dust cover 21 on the ball joint 1 can be shortened first. Since it is not necessary to form a mounting groove on the outer peripheral surface of the socket 3, the socket 3 can be easily processed by this amount. Since no band is required, the cost is reduced accordingly. Unlike the prior art, the dust cover 21 does not have a film portion that spreads out in a substantially lantern shape, and as shown in the figure, the grease 2 is placed in a narrow space on the socket 3 side from the base portion 22 on the inner circumference of the dust cover 21. Is filled. Therefore, the filling amount of the grease 2 can be reduced more than ever before.

[0009]

[Effect of device]

 The present invention has the following effects. When the dust cover is attached to the ball joint, the dust cover is simply externally attached to the ball stud, so that the attaching work time can be shortened as compared with the conventional case. Since it is not necessary to form a mounting groove on the outer peripheral surface of the socket, the processing of the socket is facilitated by this amount. Since no band is required, the cost is reduced accordingly. Unlike the prior art, it does not have a film portion that spreads out in a substantially lantern shape, and the grease filling space is narrower than before, so the amount of grease filled can be reduced compared to before.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mounted state of a ball joint dust cover according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a mounted state of a ball joint dust cover according to a conventional example.

[Explanation of symbols]

 1 Ball Joint 2 Grease 3 Socket 3a, 6a End Surface 4 Ball Seat 5 Ball Stud 6 Knuckle Arm 7 Nut 21 Dust Cover 22 Base 23 First Sealing Part 24 Second Sealing Part

Claims (1)

[Scope of utility model registration request] 1. Socket (3) and ball stud (5)
And a dust cover (21) made of a rubber-like elastic material attached to the ball joint (1) for fixing the ball stud (5) to the knuckle arm (6), the outer periphery of the ball stud (5) An annular base portion (22) mounted on the base portion (22) with a predetermined tightening margin, and an annular first seal portion (23) integrally molded with the base portion (22) and press-contacting the end face (3a) of the socket (3). And the base (2
2) an annular second seal portion (24) integrally molded with the knuckle arm (6) and in pressure contact with the end surface (6a) of the knuckle arm (6);
A dust cover for a ball joint, which has: