JP3377245B2 - Ball joint - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas damper supporting column tip for holding a rear door of an automobile such as a hatchback vehicle or a one-box vehicle or a trunk door of a general passenger vehicle such as a sedan vehicle in an open state. , The improvement of a ball joint mounted between the doors.

[0002]

2. Description of the Related Art An example of a conventional ball joint is shown in FIG. The ball joint will be described below. 1 is a metal ball stud, 1
Reference numeral a is a ball, 2 is a synthetic resin socket, 2a is a vertically penetrating storage portion, 3 is a synthetic resin cap, and 4 is a metal elastic ring having a cut.

The socket 2 and the cap 3 have a fitting structure, and a ridge 2b formed on the inner surface of the housing 2a of the socket 2 and an annular groove 3a formed on the outer peripheral surface of the cap 3 are provided. It is fixed by snap engagement. Further, on the back surface of the cap 3, a plurality of ribs 3b that come into contact with the upper side of the equator L of the ball 1a are formed.

Then, the elastic ring 4 is housed in the opening portion of the housing portion 2a of the socket 2, and the cap 3 is fitted and fixed from above by using the projection 2b and the annular groove 3a. Next, the ball 1a of the ball stud 1 is inserted into the cap 3 from the opening of the storage portion 2a, and the ball 1
The portion of a above the equator L is gripped by the rib 3b, and the lower portion thereof is gripped by the elastic ring 4.

[0005]

In the conventional ball joint described above, since the ball 1a is held by the cap 3, an external force is applied to the ball stud 1 from the direction of the arrow shown in the figure. If the ball 1
Since the pushing force by a is directly applied to the cap 3, there is a possibility that the cap 3 will come out of the storage portion 2a of the socket 2.

For this reason, the socket 2 needs to have a high strength, so that a material having high rigidity is used. However, it is difficult for the material having high rigidity to have a large undercut size. The fitting force with the cap 3 is weakened, and the cap 3 may come off due to the external force applied to the ball stud 1 as described above, and there is a possibility that the fitting part will be loosened due to long-term use and the cap 3 cannot be used. There was a problem that there is.

The present invention is intended to solve the above-mentioned problems. The object of the present invention is to allow the projection formed on the socket to receive the upper side of the equator of the ball, so that the cap exerts an external force by the ball. The purpose of the present invention is to provide a ball joint that can withstand long-term use without the cap being accidentally disengaged from the socket due to no additional force.

[0008]

SUMMARY OF THE INVENTION The ball joint of the present invention is intended to achieve the above-mentioned object. A ball stud has an accommodating portion for accommodating a ball and an engaging portion for fitting a cap communicating with the accommodating portion. Is formed, and the upper part of the ball is supported above the equator of the ball and the lower surface of the
A socket annular seat is formed in which the elastic ring supporting the lower is engaged mounting置嵌the equator of the ball with grayed forms a plurality of ribs for preventing the rise of the socket <br/> DOO a cap that is fitted and fixed to the engagement portion, is obtained by including a.

A protrusion is formed on the engaging portion of the socket, and an annular groove is formed on the peripheral surface of the cap fitted to the engaging portion. The annular groove is fitted on the protrusion. By doing so, the cap may be fitted and fixed to the socket.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the ball joint according to the present invention will be described below with reference to the partially exploded front view of FIG. 1 and the exploded front view of the assembled state of FIG. Note that the same reference numerals as those in the above-described conventional example indicate the same parts, and a description thereof will be omitted.

The ball stud 1 and the elastic ring 4 having the cut 4a are no different from the conventional example. Reference numeral 5 denotes a synthetic resin socket in which the tip of the gas damper G is screwed and fixed, and the socket 5 has an accommodation portion 5a for accommodating the ball 1a of the ball stud 1 and an engagement portion with which the cap 6 is fitted. 5b is formed to communicate with the upper and lower sides.

The inside diameter of the storage portion 5a is slightly smaller than the inside diameter of the engaging portion 5b, and three ribs 5c are formed above the storage portion 5a. The lower surface of the rib 5c is a curved surface similar to the outer diameter of the ball 1a. Further, a stepped annular seat 5d having a diameter adapted to the outer diameter of the elastic ring 4 is formed below the storage portion 5a, and the elastic ring 4 is fitted and mounted on the annular seat 5d. Further, a plurality of protrusions 5e are formed on the inner surface of the engaging portion 5b of the socket 5.
Are formed.

[0013] 6 is a fittable with the engaging portion 5b of the socket 5, Ri Oh <br/> in cap closing the upper end opening of the socket 5, the upper portion thereof periphery, the projection 5e is A fitting groove 6a for insertion and fitting is formed, and an insertion piece 6b divided into three parts is formed on the lower side of the fitting groove 6a so that the cap 6 is fitted in the socket 5. Then, this insert piece 6b
Is adapted to enter the storage portion 5a. The insert piece 6b is divided into three parts in order to avoid the rib 5c.

Next, to describe a method of assembling the above-mentioned components, first, the elastic ring 4 is fitted into the annular seat 5d of the socket 5 in a state where the diameter thereof is reduced. Next, the cap 6 is attached to the engaging portion 5b of the socket 5 and the fitting groove 6
The a is engaged with the ridge 5e to be fitted and fixed. Then, the ball 1 a of the ball stud 1 is inserted from the opening side of the socket 5.

At this time, the elastic ring 4 is formed by the ball 1a.
Is pushed up by contacting the ball 1a above the equator, but the elastic ring 4 contacts the lower surface of the rib 5c and is prevented from rising. Therefore, at this position, the ball 1a enters from below the elastic ring 4 and The equator L of 1a passes through the elastic ring 4. Therefore, the elastic ring 4 has an annular seat 5d.
Will be located on top.

In the ball joint thus assembled, the peripheral surface of the ball 1a above the equator L abuts on the rib 5c, and the peripheral surface below the equator L abuts on the elastic ring 4, so that the ball 1a is a socket. It becomes a state in which it cannot move upward or downward with respect to 5, so that only rotation and rocking can be performed freely. That is, it serves as a ball joint.

When an external force in the direction of the arrow in FIG. 2 acts on the ball stud 1, the ball 1a is pushed up, but the portion above the equator L of the ball 1a abuts the rib 5c of the socket 5. Since there is no external force on the cap 6, the cap 6 will not come off from the socket 5.

[0018]

As described above, according to the present invention, by forming the rib in the housing portion of the socket that abuts above the equator of the ball in the ball stud, the external force in the direction of removing the cap fitted to the socket on the ball stud is provided. Even if is applied, the rib receives an external force, so that a strong ball joint can be obtained against the external force, and the cap does not come off the socket, so it can withstand long-term use. It has an effect such as euphoria.

[Brief description of drawings]

FIG. 1 is a partially exploded front view of a ball joint according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which the same is assembled.

FIG. 3 is a cross-sectional view showing an example of a conventional ball joint.

[Explanation of symbols]

1 ball stud 1a ball L ball equator 4 elastic ring 5 socket 5a storage 5b engaging part 5c rib 5d ring seat 5e ridge 6 caps 6a annular groove

Claims (2)

(57) [Claims] 1. A storage part for storing a ball in a ball stud, and an engagement part for fitting a cap communicating with the storage part are formed. The storage part supports above the equator of the ball and is elastic at the lower surface. A compound that prevents the ring from rising.
A socket annular seat is formed in which the elastic ring supporting the lower the equator of the ball to form a number of ribs are engaged mounting置嵌, a cap that is fitted and fixed to the engaging portion of the socket, the A ball joint characterized by being equipped. 2. A ridge is formed on an engaging portion of the socket,
Further, an annular groove is formed on a peripheral surface of the cap fitted to the engaging portion, and the cap is fitted and fixed to the socket by fitting the annular groove to the ridge. The ball joint according to claim 1.