JPS60208621A - Ball joint - Google Patents

Abstract

PURPOSE:To provide a wear identifying projection by folding the terminal arm part of the coiled spring at the lower bearing side to the internal peripheral side thereof and projecting the end tip of the terminal arm part as retractable from a through hole which is formed on a closing plate, thereby preventing the identifying projection from damage. CONSTITUTION:To have an identifying projection 32 formed by a coiled spring 30 itself, the terminal end part 31 at the side of a lower bearing 26 is folded back toward the internal periphery of the coiled spring. The end tip of the terminal arm part 31 is projected from a through hole 28 which is formed through a closing plate 27, thereby forming the identifying projection 32. As a result, if the identifying projection 32 is subjected to load resulting from collision of a thrown stone against the identifying projection 32, the terminal arm part 31 of the coiled spring 30 is compressed and the identifying projection 32 is moved toward the inside of a socket until the load is released.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a kipole point with a wear amount display device used in front suspensions of automobiles and the like.

A ball joint with a wear amount display device that visually confirms and senses the amount of wear requires exposing the display protrusion 8 that displays the amount of wear to the outside of the ball joint 1, as shown in FIG. be.

Such exposed display protrusions 8 had to be formed extremely strongly, since there is a risk that deformation due to impact such as a collision with a flying stone could cause damage such as chips.

Therefore, in conventional ball joints of this type, the material selection for the lower bearing 7 is limited to steel.
This is a cause that prevents the ball joint from achieving low torque.

Therefore, the present invention was made to solve the above-mentioned drawbacks.
The purpose of the present invention is to provide a ball joint equipped with a wear amount display device which absorbs the valence groups applied to exposed display protrusions and does not cause damage to the display protrusions.

An embodiment of the present invention will be described below based on the drawings.

FIG. 2 shows a lower ball joint 20 used in the front suspension.

The ball joint 20 includes a pole stud 21, a socket 24, an upper bearing 25, a lower bearing 26, a coil spring 301, a closing plate 27, and a seal rubber 29.

The socket 24 has a cylindrical shape and has openings at both ends, one of which is closed by a closing plate 27, and the other opening 33 allows the handle 22 of the ball stud to protrude swingably.

The pole stud 21 has a spherical head 23 at one end of the handle 22.
has.

The head 23 of the pole stud is attached to the socket 2 with the upper half on the handle side supported by the upper bearing 25 and the lower half on the side opposite to the handle supported by the lower bearing 26.
4, and the closing plate 27 and the lower bearing 2
The coil spring 30 is installed in a compressed state between the cylindrical member 6 and the cylindrical member 6, and the coil spring 30 is constantly pressed toward the shisokerato opening 133.

Therefore, if the head 23 or bearings 25 and 26 wear out while using the ball joint 20, the lower bearing 2
6 will be relatively moved in the direction approaching the socket opening 33.

The coil spring 30 is formed using spring steel for a normal cylindrical coil spring, hard steel wire, piano wire, or the like. This coil spring 30 has a distal arm portion 3 on the lower bearing 26 side in order to form the display protrusion 32 by itself.
1 is folded back toward the inner peripheral side of the coil spring. The end of the distal arm portion 31 projects from the through hole 28 formed through the closing plate 27 and forms a display protrusion 32 .

The closing plate 27 is fixed to the socket opening by caulking the periphery of the cage opening onto the closing plate 27.

The above-mentioned through hole 28 is formed approximately in the center of this closing plate 27, and a seal rubber 2 is further inserted into the through hole 28.
9 is fixed by baking.

This seal rubber 29 has flange portions on both sides in the axial direction, and has a small hole formed approximately at its axial center with a diameter smaller than the diameter of the display projection to ensure penetration of the display projection 32 and sealing around the penetrating portion. is formed through it.

In addition, upper bearing 25 and lower bearing 2
6 is appropriately selected from resins with excellent wear characteristics such as nylon, polyacetal, and polyurethane.

Tsukini Explaining the function of the wear amount display device in the above ball joint 0 As mentioned above, as wear progresses during use of the ball joint 20, the lower bearing 26 moves relative to the socket 1'' 33. Then, the display protrusion 32 also moves relatively toward the opening 33. As a result, the amount of wear on the ball joint 20 can be visually detected.

Note that if the display protrusion 32 receives a negative impact due to a stone colliding with it, the tip arm 31 of the coil spring coil 30 will bend, and the display protrusion 32 will remain in the socket until the negative impact is removed. Move inward.

Therefore, even if the display protrusion 32 is subjected to an impact, deformation and damage such as chips will hardly occur.

When the load applied to the display protrusion 32 is removed, the distal arm portion 3
1 is restored by its own elasticity, and the display protrusion 32 also returns to its protruding state before receiving the load.

As described above, according to the present invention, the impact applied to the exposed display protrusion is absorbed by the flexure of the tip arm, and since the display protrusion itself is formed from a part of the coil spring, the rigidity is high, and the display protrusion is prevented from being damaged. Never.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view of a conventional pole cylinder equipped with a wear amount display device. FIG. 2 shows an embodiment of the present invention and is a sectional plan view of a ball joint. (Explanation of symbols) 20...Ball cylinder. 21...
・Ball stand. 22...Handle. 23...Head. 26...Lower bearing. 27...
Closing plate. 28...Through hole. 30... Coil spring. 31...Tip arm. 32...Wear amount display protrusion.

Claims (1)

[Claims] If? A socket 24 whose ia opening is closed with a closing plate 27
A ball joint 11 in which a head 23 of a ball stud 21 with a handle is positioned on the inner periphery of the ball stud 21, and the tip side of the head 23 opposite to the handle 22 is compressed and supported by a coil spring 30 via a lower bearing 26. ! Fold back the tip arm portion 31 of the coil spring 30 on the lower bearing 26 side toward the inner circumferential side of the coil spring, and attach the tip of the tip arm portion 31 to the closing plate 27.
A ball joint characterized in that a wear amount display protrusion 32 is protruded from a single through hole 28 so as to be movable forward and backward.