JPH0343464Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a ball joint.

BACKGROUND TECHNOLOGY A ball joint generally consists of a ball stud with a spherical part, a ball seat that fits and holds the spherical part of the ball stud, a socket into which the ball seat is fitted, and a caulking part at the lower end of the socket. and an end cover that is fixed to the ball seat and supports the bottom surface of the ball seat, and the ball stud is usually configured to be able to rotate around its center line and swing around the center of the spherical part. be.

Problems to be solved by the invention In the conventional ball joint as described above, the ball stud is free to rotate (hereinafter simply referred to as sliding) and swing around its center line, and the sliding torque is Since the swing torque and the swing torque cannot be set separately, a low torque joint with a low sliding torque setting will also have a low swing torque, which can cause the ball stud to swing easily during assembly and cause the socket side to move. If the problem is that the assembly work is difficult to perform, or if only sliding of the ball stud is required and rocking is a problem, a special swivel joint can be manufactured instead of a ball joint. This poses the problem of being uneconomical.

Means for Solving the Problems The present invention forms a recess in the spherical part of the ball stud, projects inside the ball seat, fits into the recess, and restrains the ball stud from swinging. A protrusion is provided to hold the ball stud in a state where it can only slide around its centerline, and when a large external force is applied to the ball stud in the swinging direction, the protrusion moves outward or breaks, causing the ball stud to move outward. It is characterized by being configured to be swingable.

Effect As described above, by performing the assembly work with the ball stud restrained from swinging, the assembly work can be significantly simplified, and after the assembly is completed, the empty ball stud can be moved in the swing direction. Apply a large external force to move or break the protrusion to make it swingable and give it a ball joint function, or create a swivel that allows the ball stud to only slide around its centerline even after assembly is complete. Either can be used as a joint.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention.
1 is a ball stud having a spherical part 11; 2 is a ball seat into which the spherical part 11 of the ball stud 1 is fitted; 3 is a socket into which the ball seat 2 is fitted; 4 is a socket at the lower end of the socket 3. This is an end cover that is secured with a shim.

A recess 12 having a substantially spherical surface is formed at the tip of the spherical portion 11 of the ball stud 1, and a hole 21 is formed at the center of the bottom surface of the ball seat 2, and a tip 51 is formed in the hole 21. A protruding member 5 that fits into a recess 12 formed in the spherical portion 11 is press-fitted.

The center line of the projection member 5 fitted into the spherical recess 12 and the hole 21 of the ball seat 2 is as follows:
It has a structure that matches the center line of the ball stud 1.

In the above, the protruding member 5 is in a state in which its tip is fitted into the recess 12 of the spherical part 11 due to the friction caused by press-fitting into the hole 21, and in this state, the ball stud 1 can slide around its center line. However, the swinging is restrained by the fit between the recess 12 and the protruding member 5, and if assembly work is performed in this state, the protruding member 5 will not move as much as the external force acting in the direction of swinging of the ball stud during the assembly work. does not move and maintains the swinging restrained state, and the ball stud 1 is assembled while remaining in the neutral position as shown, thereby significantly simplifying the assembly work.

When a large external force is applied to the ball stud 1 in the swinging direction after assembly is completed, the force in the direction of pushing down the protrusion member 5 by the recess 12 is absorbed by the friction caused by the press-fitting of the protrusion member, and the protrusion member 5 is pushed downward, and thereafter. is in a state where it can slide and swing freely.

FIG. 2 shows a second embodiment of the present invention.
In this example, the ball seats 2 are the upper side 2A and the lower side 2B.
The second point is that the lower ball seat 2B is divided into two parts, and that a protrusion 22 that fits into the recess 12 of the ball stud 11 and restrains the swinging of the ball stud 1 is integrally formed in the center of the bottom surface of the lower ball seat 2B. The only difference from the embodiment shown in FIG. 1 is that the structure other than the above is the same as that shown in FIG. 1, and the same parts as in FIG. 1 are designated by the same reference numerals.

The one shown in Fig. 2 is the same as the one shown in Fig. 1 in that the ball stud 1 is kept in a restrained state during the assembly work, and the assembly work can be significantly facilitated. When a large external force is applied to the ball stud 1 in the swinging direction after the assembly work is completed, the protrusion 22 is broken (cut) and the ball stud 1 can swing and slide freely from then on. It is something.

FIG. 3 shows a third embodiment of the present invention, in which a circumferential groove-like recess 13 is formed on the outer peripheral surface of the spherical portion 11 in a plane perpendicular to the center line of the ball stud 1. , a protrusion 23 that fits into the recess 13 is formed all around or partially integrally with the lower ball seat 2B, so that the ball stud 1 is in a state where it can slide freely but is restrained from swinging. This is what was held.

In this third embodiment, as in the second embodiment, the ball stud 1 is held in a state in which its swing is restrained during the assembly process, thereby facilitating the assembly process. After the assembly is completed, a large external force is applied to the ball stud 1 in the swinging direction so that the protrusion 23
It is possible to break (cut) the material so that it can freely swing and slide.

In the embodiments shown in FIGS. 1 to 3 above, the ball stud 1 can only slide within the range of the magnitude of the input that would push down or break the protrusion member 5 or the protrusions 22, 23 even after the assembly is completed. Since it is in a state where it cannot swing, it is possible to use it as it is as a swivel joint.In particular, when the protrusion 23 is formed all around the circumference as shown in Fig. 3, the breaking strength of the protrusion 23 is quite high, so it is difficult to assemble it. Suitable for use as a swivel joint that can only slide after attachment is complete.

In FIGS. 1 to 3, reference numeral 7 denotes an oil groove for lubrication formed between the sliding surface of the spherical portion 11 of the ball stud 1 and the ball seat 2.

Effects of the invention According to the invention configured as described above, a recess is formed in the spherical part of the ball stud, and an inward protrusion that projects inward from the bearing surface of the ball seat and fits into the recess is provided, so that the ball Because the stud is structured so that it can slide around its center line but cannot swing, the ball stud always remains in a neutral position during assembly, which greatly simplifies the assembly process. After assembly is completed, a large force is applied to the ball stud in the swinging direction to move the protrusion, or the protrusion is broken to allow swinging to provide a ball joint function, or the protrusion is It is possible to provide a swivel joint function that allows only sliding while remaining fitted in the recess, and in addition to being low in cost, it can bring about great practical effects.

[Brief explanation of drawings]

1, 2, and 3 are sectional views showing embodiments of the present invention, respectively. 1...Ball stud, 2...Ball seat,
3...Socket, 4...End cover, 5...Protrusion member, 6...Bolt, 11...Spherical part, 12,
13... recess, 22, 23... protrusion.

Claims (1)

[Scope of utility model registration request] A ball stud having a spherical part, a ball seat that fits and holds the spherical part of the ball stud,
In a ball joint consisting of a socket into which the ball seat is fitted, a recess is formed in the spherical part of the ball stud, and the socket protrudes inside the ball seat and fits into the recess formed in the spherical part of the ball stud. A protrusion is provided that restrains the stud from swinging and holds the ball stud in a state in which it can only slide around its center line, and when a large external force is applied to the ball stud in the swinging direction, the protrusion 1. A ball joint, characterized in that the ball stud is configured to move or break so that the ball stud can swing.