JPS62274109A - Rubber ball stud for ball joint - Google Patents

Abstract

PURPOSE:To improve the characteristic of vibration and impact absorption under a load by making the rubber layer portion receiving a compressive load thicker than the other rubber layer portion and bringing the head of a ball joint close to the axial direction of one side of a shell and joining together. CONSTITUTION:A socket 10 has at both ends openings, one of which is closed with a shut-off plate 12 and the other opening 11 has the shaft-center shaft 3 of a ball stud 2 protruding therefrom. A rubber layer 5 has a rubber layer portion where the lower half of the head 4 of the ball stud 2 bears a load and whose wall thickness is diminished in comparison with the wall thickness at a time when the ball stud 2 is free. As for a shell 6, the rubber layer portion receiving a compressive load is formed with more thickness than the other rubber layer portion, and both ends of the ball stud axial direction of the rubber layer 5 are compressed hard, and thus a compressive stress enough to prevent the ball stud 2 while in the from peeling off is given.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Industrial Field of Application The present invention relates to a rubber ball for ball joints with improved vibration and shock absorption performance used in automobile suspensions, steering linkages, etc. Regarding studs.

Prior Art Conventional technology regarding rubber ball studs for ball joints in which a rubber layer is provided between the ball stud shaft and a spherical shell to improve vibration and shock absorption performance includes, for example, Japanese Patent Laid-Open No. 57-1815. No. and Japanese Patent Publication No. 57-2980
There are No. 9 and so on.

In these rubber ball studs, as shown in FIG. 3, a rubber layer 5 surrounding the shaft head 4 and a shell 7 are provided substantially symmetrically above and below the equator of the stud head 4.

Problems to be Solved by the Invention When the rubber ball stud 2 is assembled to the ball joint 1 and the ball joint is installed in a car, the shell 7 and the shaft are damaged due to the load applied to the socket 10 of the ball joint and the ball stud 2. The relative positional relationship with the axial head 4 collapses, and the rubber layer 5 becomes thinner on either side of the equator.

This tendency becomes stronger as the applied load increases, and there is a disadvantage that the vibration and shock absorbing function also weakens accordingly.

Furthermore, in order to solve this problem, the outer diameter of the spherical head of the rubber ball stud 2 must be increased, and the ball joint 1 must be made larger.

Means for solving the problem: The spherical head at one end of the shaft is connected to the inner periphery of a spherical shell of approximately uniform thickness via a pre-compressed rubber layer, and the ball joint is placed in a predetermined position. In order to make the rubber layer portion that receives compressive load when installed thicker than other rubber layer portions, the head portion relative to the shell is offset toward one axial end of the shell and joined. .

Operation When the ball joint is installed in the specified position and the rubber layer receives a specified load, the thickness of the rubber layer on the load-bearing side will be the same as the thickness of the rubber layer on the opposite side. It can maintain its quality.

Embodiment The structure of an embodiment of the present invention will be explained below based on the drawings.

FIG. 1 shows the rubber ball stand 2 after being pressed into a spherical shape, and FIG. 2 shows the ball joint 1 to which the rubber ball stud 2 is assembled.

This ball joint 1 is equipped with a rubber ball stud 2, a socket 10, a synthetic resin cross-section bearing 13, a urethane rubber lower bearing 14, and a closing plate 12.

The socket 10 has a substantially cylindrical shape and has openings at both ends, one of which is closed by a closing plate 12, and the other opening 11 allows the axis 3 of the ball stud 2 to protrude swingably.

Note that FIG. 2 shows a state in which the above-mentioned pole joint 1 is attached to the upper side of a double-leishbon type suspension for an automobile, and shows an upper arm 26 connected to the central shaft 3 and a knuckle arm connected to the socket 10. 25, loads in the directions of arrows A and B are applied between the rough ball stud 2 and the socket 10.

Therefore, the rubber layer 5 bears the compressive load on the tip side of the ball stud, that is, on the lower half side of the equator of the head 4, and the thickness of the rubber layer there also decreases when the rubber ball stand is free. are doing.

This rubber ball stud 2 includes a shaft 3 having a spherically bulged head 4 at one end, a compressed rubber layer 5 substantially surrounding the head 4, and a steel layer 5 substantially surrounding the rubber layer 5. It is composed of a thin-walled spherical shell 7.

The rubber ball stud 2 is supported by the spherical shell 7bx hair ring 13.14, so that the inner spherical surface of the bearing and the spherical outer surface of the shell slide as the shaft center shaft 3 swings or rotates. ing.

Next, a method for manufacturing the rubber ball stud 2 will be explained.

The shaft 3 having the head 4 is formed in advance by cold plastic working, and then subjected to cutting and, if necessary, heat treatment such as carburizing and quenching.

The shell 7 is formed by cutting a cylindrical steel pipe with a desired wall thickness into an appropriate length, and by press-forming or the like in advance to form a spindle-shaped curve as shown in the shell 6 shown by two dots and four lines in FIG.

Next, the preformed shell 6 and head 4 are set in a mold (not shown), rubber is injected into the opposing space between the shell 6 and the head 4, and vulcanization and baking are performed. is applied to join the shell 6 and the head.

When connecting the shell 6 and the head 4, in order to make the rubber layer part that receives the compressive load thicker than the other rubber layer parts by installing the ball joint 1 in a predetermined position, the head relative to the shell 6 is To connect a part 4 without shifting the position toward the tip of the stud.

Subsequently, the cylindrical shell 6 of the ball stud 2 is pressed into a spherical shape by deforming both ends of the shell 6 using a cup die 20, 21 as shown by the two-dot chain line in FIG.

As the shell is formed into a spherical shape, both ends of the rubber layer 5 in the ball stud axis direction are strongly compressed, and the rubber layer 5 has sufficient strength to prevent the rubber layer from peeling off during use of the ball joint. Compressive stress is applied.

In addition, when the shell is pressed into a spherical shape, the shaft center head is displaced toward the end opposite to the head of the shell with respect to the shell.
The rubber layer portion on the tip side of the ball stand is formed to be sufficiently thicker than the rubber layer portion on the opposite side.

Effects As described above, according to the present invention, the ball joint can be mounted in a predetermined position by making the rubber layer portion on the load-bearing side sufficiently thicker than the rubber layer portion on the opposite side. However, when the rubber layer receives a predetermined load, the rubber layer on the load-bearing side can maintain an appropriate thickness similar to the thickness of the rubber layer on the opposite side, making the outer diameter of the ball joint larger. It is possible to improve the vibration and shock absorption characteristics under load when the ball joint is attached without causing any damage.

[Brief explanation of the drawing]

1 and 2 represent embodiments of the present invention.
The figure is a cross-sectional view of the rubber ball stud after forging. Second
The figure is a cross-sectional view of a rubber ball joint. FIG. 3 is a sectional view of a conventional rubber ball stud. (Explanation of symbols) 1...Ball joint. 2...
ball stand. 3...Axis, center, axis. 4...
Head. 5...Rubber layer. 6... Cylindrical shell (before forging). 7... Spherical shell (after forging). 10... So ke no to. 13.
14...Bearing.

Claims (1)

[Claims] In a ball stud for a ball joint in which a spherical shell 7 at the shaft end is slidably supported by bearings 13 and 14 fitted to the inner periphery of a socket 10 of a ball joint 1, a spherical shell 7 of approximately equal thickness is used. The spherical head 4 at one end of the shaft 3 is connected to the inner periphery via a pre-compressed rubber layer 5, and the ball joint 1 is installed in a predetermined position so that the rubber layer that receives the compressive load is connected to the other A rubber ball stud for a ball joint, characterized in that the head 4 is connected to the shell 7 with the head 4 offset toward one axial end of the shell 7 in order to have a thicker wall than the rubber layer portion.