JPH031617Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a ball joint used in steering linkages, suspensions, tie rods, etc. of automobiles.

(Prior Art) Conventionally, there are ball joints of this type as shown in FIGS. 5 and 6. In Fig. 5, 1 is a ball joint socket formed at the tip of the rod 2, 3 is an integral bearing without a split structure, 4 is an end cover, 5 is a dust cover, and 6 is a ball portion 6a at the tip. The assembly structure is such that after the ball part 6a of the ball stud 6 is fitted into the integral bearing 3 and pressed into the cylindrical hollow part 1a of the ball joint socket 1, the integral bearing 3 is assembled. By interposing the end cover 4 at the bottom end of the bearing 3 and caulking the bottom edge 1b of the ball joint socket 1,
Connect ball stud 6 to ball joint socket 1
It is attached by tightening it.

FIG. 6 is a longitudinal cross-sectional view showing the shape of the integral bearing 3. The outer peripheral wall 3a is formed into a cylindrical shape so as to fit into the hollow part 1a of the ball joint 1, and the outer peripheral wall 3a is formed into a cylindrical shape so as to fit into the hollow part 1a of the ball joint 1. The ball portion 6a is fitted into the subsequently provided hollow portion 3c.

In a ball joint with this structure, the swinging torque and sliding torque of the ball stud 6 with respect to the ball joint socket 1 are set based on, for example, the radial tightness and axial compression between the integral bearing 3 and the ball portion 6a. This was done by adjusting the tightening allowance, etc.

(Problems to be Solved by the Invention) However, in the case of such a conventional ball joint, the ball joint socket 1 has a cylindrical outer circumferential wall 3a inside the cylindrical hollow part 1a. An integral bearing 3 is fitted, and the integral bearing 3 is tightened with an end cover 4 provided at a position offset from the center of the spherical portion 6a of the ball stud 6.

For this reason, if the radial tightening allowance is increased in order to adjust the rocking torque or sliding torque, even if an attempt is made to fit the integral bearing 3 into the ball joint socket 1 during assembly, the ball portion 6a will not be integrated. It has come out of the bearing 3 and cannot be assembled. On the other hand, if the compression allowance from the axial direction is increased, the integral bearing 3 is deformed, and in order to insert the integral bearing 3, the upper part of the ball joint socket 1 must be removed. It protrudes from the opening 1b formed in the. For these reasons, there was a problem in that it was not possible to obtain a large swing angle and a high swing torque.

(Means for solving the problem) The present invention was made in view of the above problems, and its purpose is to provide a ball joint that can obtain a large swing angle and high swing torque. In order to achieve this objective, the shape of the outer circumferential wall of the integral bearing is made cylindrical from the opening side for inserting the ball stud to a predetermined part, and gradually tapers outward from the middle. The integral bearing is formed into a circular shape from the tapered end portion, and when the integrated bearing is tightened and installed in the ball joint socket via the end cover, the force from the end cover is absorbed. The present invention is characterized in that it is configured to act on the center of the spherical portion of the ball stud, thereby solving the above-mentioned problems.

(Example) Hereinafter, an example of the ball joint according to the present invention will be described with reference to the drawings.

In Fig. 1, 7 is a ball joint socket formed at the tip of the rod 8, 9 is an integral bearing with no split structure, 10 is an end cover, 11 is a dust cover, and 12 is a ball portion 12 at the tip.
This is a ball stud with a ball stud 1, and its assembly structure consists of an integral bearing 9 and a ball stud 1.
After press-fitting into the ball joint socket 7 with the ball portion 12a of No. 2 fitted, the end cover 10 is interposed on the bottom end of the integral bearing 9, and the bottom edge 7a of the ball joint socket 7 is closed. By tightening, the ball stud 12 is press-fitted into the ball joint socket 7.

Here, the shape of the integral bearing 9 will be explained based on FIGS. 2 to 4.

FIG. 2 shows a cross section taken along the line A-A in FIG. 4, FIG. 3 shows a side surface, and FIG.
is formed following the opening 9b, and a small diameter through hole 9c communicating with the hollow portion 9a is bored in the bottom end 9c.

The shape of the outer wall is such that a portion 9d on the side of the opening 9b is formed into a cylindrical shape, and a protruding portion 9e having a tapered portion toward the outside from the middle is formed.
e is formed in a circular shape from the terminal end to the bottom end 9c, and a plurality of elliptical convex parts 9f are formed radially in the rounded part with the through hole of the bottom end 9c as the center. has been done.

To explain the function of the ball joint configured in this way, as shown in FIG. While receiving the force from the interference, the end cover 10
The bottom end 9c of the outer wall of the integral bearing 9 receives the pressing force from the abutting surface of the spherical portion 12a, and since the outer wall of the integral bearing 9 has a circular shape on the bottom end 9c side, these forces act toward the center of the spherical portion 12a.

Further, the flange-shaped protruding portion 9e having a tapered portion formed on the outer wall balances the force from the round-shaped portion pressed by the end cover 10 and abuts against the inner circumferential wall of the ball joint socket 7. .

In this way, since the protruding part 9e having the tapered part formed on the integral bearing 9 is formed near the bottom end, this protruding part 9e does not pose a problem when fitting, and on the contrary, the tightening interference is reduced. can be increased.

(Effect of the invention) As explained above, according to the invention, the shape of the outer circumferential wall of the integral bearing is cylindrical from the opening side for inserting the ball stud to a predetermined part, and gradually increases from the middle. Formed in a tapered shape toward the outside, further formed in a circular shape from the end portion formed in the tapered shape, and when the integral bearing is tightened and installed in the ball joint socket via the end cover, Since the structure is such that the force from the end cover acts on the center of the spherical portion of the ball stud, the swinging angle of the ball stud can be increased, and the swinging and sliding torque can be increased.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the integral bearing shown in Fig. 1, Fig. 3 is a side view of the integrated bearing shown in Fig. 1, and Fig. 4 is a longitudinal sectional view showing an embodiment of the present invention.
The figures are a bottom view of the integrated bearing shown in Fig. 1, Fig. 5 is a longitudinal sectional view showing the configuration of a conventional ball joint, and Fig. 6 is a longitudinal sectional view showing the shape of the integrated bearing shown in Fig. 5. . 7: Ball joint socket, 9: Integral bearing, 9a: Hollow part, 9b: Opening part, 9c:
bottom end, 9d: opening side part, 9e: protrusion,
9f: Convex portion, 10: End cover, 12: Ball stud, 12a: Ball portion.

Claims (1)

[Claim for Utility Model Registration] An integral bearing that holds the ball of the ball stud is press-fitted into a ball joint socket, and the bottom end of the integral bearing is pressed by an end cover to generate a predetermined swing torque. In a ball joint that generates sliding torque, the shape of the outer peripheral wall of the integral bearing is formed into a cylindrical shape from the opening side for inserting the ball part of the ball stud to a predetermined part, and gradually from the middle. A protruding part having an outwardly tapered part is formed, and the tapered part is further formed in a circular shape from the terminal end to the bottom end, and the circular part has a plurality of elliptical convexities. The projecting portion and the elliptical convex portion provided on the convex surface are formed in a radial shape, and when the integrated bearing is tightened and press-fitted into the ball joint socket through the end cover, the end A ball stud characterized by having a shape in which force from the cover acts on the center of the spherical part of the ball stud.