JPH04113324U - ball joint - Google Patents

Abstract

(57) [Summary] (with corrections) [Structure] On the handle of the ball stud of the ball joint,
A tapered part that increases in diameter toward the ball head side in the axial direction of the ball stud is formed, and a ring is installed in the small opening of the dust cover, and the installation position of the ring is adjusted in the axial direction of the small opening of the dust cover. In this case, the open end side of the small opening was set. [Effect] While preventing the small opening of the dust cover 2 from moving in the direction of the ball head 4 of the ball stud 3, all of the lips 9 provided on the inner circumference of the small opening 7 of the dust cover can be brought into contact with the outer circumferential surface of the handle 6 of the ball stud with approximately equal strength, so that in the axial direction of the small opening 7 of the dust cover, the lip on the open end side of the small opening The stud does not separate from the outer circumferential surface of the handle, and a particular lip does not wear abnormally. Therefore, even if the ball joint is used for a long period of time, the sealing performance in the small opening of the dust cover can be maintained.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to ball joints used in automobile suspension systems, steering systems, etc. do.

0002

[Conventional technology]

Conventionally, in the small opening of the dust cover of a ball joint, In order to prevent communication with the outside, a lip is provided on the inner circumference of the small opening, and a ring is also placed on the small opening. By installing and tightening the small opening, the lip can be strongly abutted against the ball stud. Seal between the outer circumferential surface of the ball stud and the inner circumferential surface of the small opening in the dust cover. Was.

0003 Such a ball joint is shown in Utility Model Publication No. 44-28333. There are many things.

0004 Also, if the ball joint is used for an extremely long period of time, the body of the dust cover may become damaged. The dust cover may collapse due to loss of repulsion. In that case, the button The small opening of the dust cover attached to the handle of the ball stud is the ball head of the ball stud. The connecting rod may move in this direction and separate from the end face of the connecting rod, creating a gap between the two. Therefore, as shown in the left half of FIG. 1 and FIG. To prevent the ball stud 103 from moving, attach the ball stud 1 to the handle 106 of the ball stud 103. A tapered portion 119 whose diameter increases toward the ball head 104 side in the axial direction of 03. It is effective to form such a ball joint, and this type of ball joint is disclosed in Japanese Patent Application Laid-open No. 53- There are many such as those shown in No. 49658.

[0005]

[Problem that the idea aims to solve]

However, in the ball joint 101 as described above, the design of the ring 108 is The installation position is approximately at the center in the axial direction of the small opening 107 of the dust cover 102. be. Therefore, the tightening force applied to each lip 109 is It is the strongest in , and weakest in other lips. However, as mentioned above, the dust cover Tapered part of handle 6 of ball stud 103 to which small opening 107 of 102 is attached 119 is directed toward the ball head 104 side in the axial direction of the ball joint 103. The diameter is expanded.

[0006] Therefore, in the axial direction of the central lip 109a and the small opening 107, A lip located on the opposite side of the open end 120 of the small opening 107 from the center lip 109a. 109b (hereinafter referred to as the lower lip) is the outer periphery of the handle 106 of the ball stud 103. This results in strong contact with the surface 118. However, in the axial direction of the small opening 107, The lip located closer to the open end 120 of the small opening 107 than the central lip 109a 109c (hereinafter referred to as upper lip) is the outer periphery of the handle 106 of the ball stud 103. It may not come into contact with the surface 118.

[0007] In that case, the tightening force may be concentrated on the lower lip 109b, causing abnormal wear. , the sealing performance of the small opening 107 of the dust cover 102 of the ball joint 101 is It will drop.

[0008] In this invention, the small opening of the dust cover of the ball joint is The inner circumference of the small opening of the dust cover is designed to prevent movement toward the ball head. Apply several lips to the outer circumferential surface of the ball stud handle with approximately equal strength. The purpose is to bring them into contact.

[0009]

[Means to solve the problem]

The present invention has the following configuration.

0010 On the handle of the ball stud, towards the ball head side in the axial direction of the ball stud. At the same time, a ring is installed in the small opening of the dust cover. the ring, and set the ring in the axial direction of the small opening in the dust cover. Place it on the open end side of the mouth.

[0011]

【Example】

The first embodiment of the present invention will be explained below based on the right half of FIG. 1, FIGS. 2 and 3. do.

0012 The right half of FIG. 1 shows the ball joint according to the first embodiment of the present invention, and FIG. 2 shows the ball joint according to the first embodiment of the present invention. Figure 1 is an enlarged view of part A, and Figure 3 shows the same part as in Figure 2 before the ring is installed. Was.

[0013] In Figure 1, 1 is a ball joint, which mainly consists of a ball stud 3 and a housing. It is composed of a dust cover 2 and a dust cover 2.

[0014] The ball stud 3 consists of a handle 6 and a ball head, and the ball head 4 is attached to a resin bearing. It is held in the housing 5 via a tag 22. The ball head 4 is inside the housing 5. The handle 6 is slidably and rotatably supported, and the handle 6 protrudes from the opening 14 of the housing 5. , is fitted and fixed to a connecting rod (not shown) such as a knuckle arm.

[0015] The handle 6 of the ball stud 3 has a ball head 4 in the axial direction of the ball stud 3. A tapered portion 19 whose diameter increases toward the side is formed. This tapered part 19 Since the maximum diameter is larger than the minimum diameter of the small opening 7 of the dust cover 2, the small opening 7 crosses the maximum diameter part of the tapered part 19 and extends in the axial direction of the ball stud 3. Therefore, the ball head 4 side does not move.

[0016] The dust cover 2 is made of an elastic material such as urethane and has a substantially cylindrical shape. The body portion 11 has a bellows shape. The large opening 12 at the end of this dust cover 2 is , a dust cover mounting groove 16 formed on the outer peripheral surface near the opening 14 of the housing 5 is mated to. A circlip 13 is attached to the outer periphery of the large opening 12. This circlip 13 tightens the large opening 12 and closes the dust cover. It will be fixed in the mounting groove 16. A seal lip is provided on the inner circumference of the large opening. It is.

[0017] As shown in FIG. 2, the inner circumference of the small opening 7 at the other end of the dust cover 2 has three chevron-shaped A lip 9 is provided. Opening of the small opening 7 in the axial direction of the small opening 7 A ring mounting groove 21 is formed on the outer periphery of the small opening 7 on the end 20 side. A ring 8 is installed in the ring mounting groove 21. Ring 8 is made of stainless steel, etc. It is made of metal, and its tightening force urges and tightens the small opening 7 in the inner diameter direction, A seal is formed between the handle 6 of the ball stud 3 and the small opening 7 of the dust cover 2. .

[0018] This ring 8 is installed at the open end 20 of the small opening 7 among the three lips 9. The position of the lip 9a (hereinafter referred to as the upper lip) closest to the They almost match in the direction.

[0019] Before the ring 8 is installed, the small opening 7 of the dust cover 2 is closed automatically, as shown in Fig. 3. In this state, the upper lip 9a is in contact with the outer peripheral surface 18 of the handle 6 of the ball stud 3. Not yet. However, as shown in FIG. 2, when the ring 8 is installed in the small opening 7, the ring The pin 8 biases the small opening 7 in the inner radial direction, and applies pressure in the inner radial direction on each lip 9. The force is strongest at the upper lip 9a, and becomes weaker as the distance from the upper lip 9a increases.

[0020] However, as mentioned above, the handle 6 of the ball stud 3 has an axial direction of the ball stud 3. Since a tapered portion 19 is formed that expands in diameter toward the ball head 4 side in the direction, , each lip 9 of the small opening 7 of the dust cover 2 is located outside the handle 6 of the ball stud 3. The tendency of the small opening to come into contact with or be pressed against the peripheral surface 18 is that in the axial direction of the small opening 7, The further away from the open end 20 of the portion 7, the stronger it becomes.

[0021] Therefore, each lip 9 of the small opening 7 of the dust cover 2 has approximately equal strength. It comes into contact with the outer circumferential surface 18 of the handle 6 of the handle stud 3.

[0022] The second embodiment of the present invention will be explained below based on the FIG. 1A part and FIG. 4, which is an enlarged view of the same part. I will explain.

[0023] Compared to the first embodiment, the second embodiment of the present invention has a small opening 7 of the dust cover 2. The number of lips 9' formed on the inner periphery of the ring 8 and the method of installing the ring 8 are different.

[0024] On the inner periphery of the small opening 7 of the dust cover 2, six chevron-shaped lips 9' are provided. There is. A small opening on the open end 20 side of the small opening 7 in the axial direction of the small opening 7 A ring 8 is installed and buried inside the ring 7 .

[0025] This ring 8 is installed at the open end 2 of the small opening 7 among the six lips 9'. The position of the lip 9'a (hereinafter referred to as the second lip) that is second closest to 0 and the small opening. They substantially coincide in the axial direction of the mouth portion 7. Therefore, each lip 9' The urging force in the inner radial direction is strongest near the second lip 9'a, and The further away from the drip 9'a, the weaker it becomes.

[0026] However, the handle 6 of the ball stud 3 has a tapered portion 19 similar to the first embodiment. is formed, so that each lip 9' of the small opening 7 of the dust cover 2 is formed with a bow. The tendency of the stud 3 to come into contact with or be pressed against the outer peripheral surface 18 of the handle 6 is due to the small opening 7. In the axial direction, the further away from the open end 20 of the small opening 7 the stronger it becomes.

[0027] Therefore, each lip 9' of the small opening 7 of the dust cover 2 has approximately equal strength. It is assumed that it comes into contact with the outer circumferential surface 18 of the handle 6 of the ball stud 3.

[0028] According to the present invention, the number of lips provided on the inner periphery of the small opening of the dust cover, The shape and the material, shape, and installation method of the ring are not limited to this example. Other locations of the ball joint may also adopt other configurations as appropriate.

[0029] As described above, according to the present invention, the axis of the ball stud is attached to the handle of the ball stud. It forms a tapered part that expands in diameter toward the ball head side in the direction, and also Place the ring in the small opening of the cover, and adjust the ring installation position to the small opening of the dust cover. In the axial direction of the opening, the open end of the small opening is placed on the open end side, so the ball joint The small opening in the dust cover moves towards the ball head of the ball stud. All of the multiple lips provided on the inner circumference of the small opening of the dust cover while preventing Because it can be brought into contact with the outer circumferential surface of the ball stud handle with approximately equal strength, The lip on the open end side of the small opening of the dust cover in the axial direction of the small opening However, it does not separate from the outer circumferential surface of the ball stud handle, and certain lips may There is no constant wear, so even if the ball joint is used for a long period of time, there will be no dust cover. It is possible to maintain sealing performance in the small opening of the bar.

[Brief explanation of drawings]

FIG. 1 is a partially sectional plan view in which the left half shows a conventional ball joint and the right half shows a ball joint according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the section in FIG. 1A.

FIG. 3 is an enlarged view of the portion in FIG. 1A and the same portion showing the state before the ring is installed.

FIG. 4 is an enlarged view of the same part as the part in FIG. 1A of the ball joint according to the second embodiment of the present invention.

FIG. 5 is an enlarged view of the part in FIG. 1B.

[Explanation of symbols]

1 ball joint 2 Dust cover 3 Ball stud 4 Ball head 5 Housing 6 Pattern 7 Small opening 8 ring 9 Lip 10 lip 12 Large opening 19 Taper part 20 Open end

Claims (1)

[Scope of utility model registration request] 1. A large opening (12) at one end of a dust cover (2) is attached to a housing (5) that holds a ball head (4) of a ball stud (3). In the ball joint (1) to which the other end small opening (7) of the dust cover (2) is attached to the handle (6), the ball stud (3) is attached to the handle (6) of the ball stud (3). ) is formed with a tapered part (19) whose diameter increases toward the ball head (4) side in the axial direction of the dust cover (2), and a plurality of tapered parts (19) are formed on the inner periphery of the small opening (7) of the dust cover (2). A ring (8) is installed in the small opening (7) of the dust cover (2), and the installation position of the ring (8) is set in the small opening (7) of the dust cover (2). A ball joint characterized in that the ball joint is located on the open end (20) side of the small opening (7) in the axial direction of the small opening (7).