JPH0720418U - Ball joint - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a ball joint which can improve lateral rigidity and is excellent in assembling. In a ball joint having a socket 1 for rotatably supporting a ball head 21 of a ball stud, and a seat 3 interposed therebetween, an outer diameter A of a seat tip 31 and a seat bottom 32 are provided. Outer diameter B, inner diameter C of the caulked portion 12 of the socket 1, and inner diameter D of the main body portion 11 of the socket 1.
There is a relationship of B>C>A> D between and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of the ball joint, especially the inner surface of the socket and the outer surface of the seat.

[0002]

[Prior art]

 For example, as shown in FIG. 4, the ball joint includes a ball stud 2 having a ball head 21 and a shaft portion 22, a socket 8 for rotatably supporting the ball head 21, and the ball head 21. It is composed of a cup-shaped sheet 7 interposed between the socket 8 and the socket 8. Further, a rubber dust cover 5 is provided between the shaft portion 22 of the ball stud 2 and the socket 8. On the other hand, a bottom plate 85 is provided at the bottom end of the seat 7, and the bottom plate 85 is caulked and fixed to the socket 8.

[0003]

[Problems to be solved]

 By the way, the conventional ball joint has the following problems. That is, in the conventional ball joint, as shown in FIG. 5, the outer diameter F of the seat 7 is changed to the socket in consideration of the assemblability when the seat 7 is assembled between the socket 8 and the ball head 21. It is smaller than the inner diameter G of 8. However, in this case, the assembling property is good, but after the assembling, as shown in FIGS. 5 and 6, a gap 86 (G − G −) is formed between the seat 7 and the socket 8 in the radial direction. F) occurs. Therefore, the lateral rigidity of the ball joint is reduced.

Therefore, in order to prevent this, as shown in FIG. 7, the outer diameter H of the seat 7 is formed larger than the inner diameter G of the socket 8 to have a tightening margin (HG) in the radial direction. It can be considered. However, as shown in FIG. 8, when the seat center axis 701 and the socket center axis 801 cause a misalignment 802 that occurs during the assembly process, the outer peripheral portion of the seat 7 rides on the caulking stepped portion 81 of the socket 8. As shown in Fig. 9, the seat is tilted and cannot be assembled. In view of such conventional problems, the present invention intends to provide a ball joint which can improve lateral rigidity and is also excellent in assembling.

[0005]

[Means for solving the problem]

 The present invention comprises a ball stud having a ball head, a socket rotatably supporting the ball head, and a seat interposed therebetween, and the socket is a side surface portion of the ball head. And a caulking portion located on the bottom side of the ball head, while the seat has a seat tip portion located between the ball head and the body portion and the caulking head. In a ball joint having a seat bottom located between the socket and the seat, an outer diameter A of the seat tip, an outer diameter B of the seat bottom, an inner diameter C of the caulking portion side of the socket, and the socket There is a dimensional relationship of B> C> A> D between the inner diameter D of the main body part and the inner diameter D of the main body part.

In the present invention, what is most noticeable are the outer diameter A of the seat tip portion on the seat side, the outer diameter B of the seat bottom portion, the inner diameter C of the caulking portion side on the one socket side, and the inner diameter D of the main body portion. It means that each dimension has a relation of B> C> A> D. Further, it is preferable that a tapered step is provided between the inner wall (inner diameter C) of the caulking portion side and the inner wall (inner diameter D) of the main body portion in the socket. As a result, the seat can be smoothly mounted between the ball head and the socket, and the assemblability is further improved.

In addition, the difference [(A−D) × 1/2] of the one side portion (radial portion) between the outer diameter A of the seat tip portion and the inner diameter D of the main body portion is 0 to 0.15 mm ( 2 times) is preferable. If it is less than 0 mm (minus direction), the lateral rigidity cannot be expected to be improved, while if it exceeds 0.15 mm, the assemblability deteriorates. Further, it is preferable that the difference [(B−C) × 1/2] of the one side portion between the seat bottom outer diameter B and the caulking portion inner diameter C is 0 to 0.15 mm. If it is less than 0 mm, improvement in lateral rigidity cannot be expected, while if it exceeds 0.15 mm, the assembling property is deteriorated.

[0008]

[Action and effect]

 In the present invention, the dimensions of the diameters A, B, C and D in the seat and the socket are in the above relationship. Therefore, the outer diameter A of the seat front end portion is larger than the inner diameter D of the main body portion of the socket, and the outer diameter B of the seat bottom portion is larger than the inner diameter C of the socket on the caulking portion side.

Therefore, when the seat is mounted between the socket and the ball head and the assembling is completed, there is a tightening margin between the seat and the socket, and a gap is not generated unlike the conventional case. Therefore, the lateral rigidity of the ball joint can be improved. Also, because of the above dimensional relationship, the seat tip can be smoothly inserted to the tapered step of the socket without the seat tilting during assembly. Therefore, it is also easy to assemble. As described above, according to the present invention, it is possible to provide a ball joint which can improve lateral rigidity and is excellent in assemblability.

[0010]

【Example】

 A ball joint according to an embodiment of the present invention will be described with reference to FIGS. First, as shown in FIGS. 1 and 3, the ball joint of this example includes a ball stud 2 having a ball head 21, a socket 1 for rotatably supporting the ball head 21, and a space between the two. It is made up of the seat 3 interposed. Further, the socket 1 has a main body 11 located on the side surface portion 213 of the ball head 21 and a caulking portion 12 located on the bottom side 214 of the ball head 21.

On the other hand, the seat 3 includes a seat tip portion 31 located between the ball head portion 21 and the main body portion 11, and a seat bottom portion 32 located between the ball head portion 21 and the caulking portion 12. Have. Then, as shown in FIGS. 1 and 2, between the outer diameter A of the seat tip portion 31, the outer diameter B of the seat bottom portion 32, the inner diameter C of the caulking portion 12, and the inner diameter D of the main body portion 11, , B> C> A> D. Others are the same as the above-mentioned conventional example.

The dimensional relations A to D are in a free state before the ball joint is assembled, as shown in FIGS. Therefore, after mounting the ball joint, as shown in Fig. 3, the outer peripheral surface of the seat 3 has a radial allowance.

Further, in this example, the difference [(A−D) × 1/2] on one side between the seat outer diameter A and the body inner diameter D is 0.08 mm. The difference [(B−C) × 1/2] between the seat bottom outer diameter B and the caulking portion inner diameter C on one side was 0.08 mm. Further, as shown in FIGS. 1 and 2, a tapered step portion 16 is provided between the caulking portion side inner diameter C and the main body portion inner diameter D. A tapered step portion 320 is also provided between the outer diameters A and B of the seat 3.

Next, the function and effect will be described. In the ball joint of this example, the dimensions of the diameters A to D in the seat 3 and the socket 1 have the above relationship. Therefore, when the seat 3 is mounted between the socket 1 and the ball head 21 and the assembling is completed, a tightening margin occurs between the seat 3 and the socket 1, and a gap may be generated as in the conventional case. Absent. Therefore, the lateral rigidity of the ball joint can be improved.

Further, because of the above-described dimensional relationship, even if the socket and the seat are misaligned to the extent that they occur in the process, the seat front end portion 31 has the crimping step portion of the crimping portion 12 of the socket 1 during assembly. It does not ride on 15 (Figs. 1 and 2). Further, the seat tip portion 31 can be smoothly inserted between the main body portion 11 and the ball head 21. Therefore, it is also easy to assemble.

Further, in the ball joint of this example, as described above, the tapered step portion 16 is provided between the inner diameter C on the side of the caulking portion and the inner diameter D of the main body portion, and the outer diameters A and B of the seat 3 described above. Tapered step portions 320 are also provided between and. Therefore, the seat front end 31 can be smoothly inserted between the ball head 21 and the socket body 11.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a dimensional relationship of essential parts in a ball joint of an embodiment.

FIG. 2 is a developed sectional view of a main part of the ball joint of the embodiment.

FIG. 3 is a sectional view of the ball joint of the embodiment.

FIG. 4 is a sectional view of a conventional ball joint.

FIG. 5 is a developed sectional view of a main part of a conventional ball joint.

FIG. 6 is an explanatory view showing problems after assembly in a conventional ball joint.

FIG. 7 is an explanatory view of another conventional ball joint.

8 is an explanatory view showing a problem at the time of assembling in the ball joint of FIG.

FIG. 9 is an explanatory view showing a problem at the time of assembling in the ball joint of FIG.

[Explanation of symbols]

 1. ． ． Socket, 11. ． ． Body part, 12. ． ． Caulking section, 2. ． ． Ball studs, 21. ． ． Ball head, 3. ． ． Sheet, 31. ． ． Seat tip, 32. ． ． Seat bottom, A. ． ． Outer diameter of seat tip, B. ． ． Outer diameter of bottom of seat, C.I. ． ． Inner diameter on caulking side, D. ． ． Inner diameter of the main body,

Claims (2)

[Scope of utility model registration request] 1. A ball stud having a ball head, a socket for rotatably supporting the ball head, and a seat interposed therebetween, wherein the socket is a side surface portion of the ball head. And a caulking portion located on the bottom side of the ball head, while the seat has a seat tip portion located between the ball head and the body portion and the caulking portion. In a ball joint having a seat bottom portion located between the seat bottom portion and the seat portion, an outer diameter A of the seat tip portion and an outer diameter B of the seat bottom portion.
And a dimensional relationship of B>C>A> D between the inner diameter C of the caulking portion side of the socket and the inner diameter D of the main body portion of the socket. 2. The ball joint according to claim 1, wherein a tapered step portion is provided between the inner wall of the socket on the side of the caulking portion and the inner wall of the main body portion.