JPS6215538Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a ball joint used for steering, suspension, etc. of automobiles.

(Prior Art) Conventionally, in a ball joint with a spring for wear compensation, a gap is provided at an arbitrary location in the axial direction of the ball stud in consideration of stacking tolerances of each component. That is, when the tolerances of each component are stacked up, the sliding resistance becomes extremely high if there is no gap, so a gap is required. Therefore, it is impossible to eliminate the axial play or movement of the ball stud in response to an external force, and to keep the movement small, the tolerances of each component must be tightened, which significantly increases costs. becomes.

Furthermore, conventionally, as shown in Japanese Utility Model Application Publication No. 50-77668, a coil spring and a hard elastic body are simultaneously applied to the spherical head of a ball stud in a socket via a spring receiver. It has been known.

However, in this conventional type, a hard elastic body is added to the coil spring in order to increase the torque; that is, the elastic body simply supplements the spring force. Furthermore, since the hard elastic body applies the load directly in the axial direction of the ball stud, the torque changes due to variations in the axial dimension become large, making it difficult to absorb the tolerances of each part. It is.

(Problems to be Solved by the Invention) As described above, in the ball joint with a spring for wear compensation, there is a problem in absorbing the tolerances of each component.

An object of the present invention is to provide a ball joint that can elastically absorb the axial tolerance of the ball stud, eliminate axial play or movement of the ball stud, and produce stable torque.

[Structure of the idea]

(Means for Solving the Problems) The present invention provides a socket 1 having a substantially cylindrical inner chamber 4 and openings 5 and 6 formed at both ends of the inner chamber 4.
and a ball having a ball head 8 disposed in the inner chamber 4 of the socket 1 and a shaft portion 9 connected to the ball head 8 and extending outward from the opening 5 at one end of the socket 1. stud 7 and the inner chamber 4 of the socket 1
The spherical seat surface 13,1 is interposed between the wall surface of the ball stud 7 and the outer surface of the spherical head 8 of the ball stud 7 and is in contact with the spherical head 8.
4, a plug 16 attached to the opening 6 at the other end of the socket 1, and a coil spring 1 stretched between the one bearing seat 12 and the plug 16.
8, an opening 6 at the other end of the socket 1 is located in the center of the one bearing seat 12, which is away from the spherical seating surface 14.
A fitting cylindrical portion 15 extending toward is integrally provided in a protruding manner,
A base portion of an elastic synthetic resin bushing 19 that contacts the plug 16 is fitted into the fitting cylinder portion 15, and a curved portion 22 is formed on the surface of the bushing 19 that contacts the plug 16.

(Function) In the present invention, the curved portion 22 of the bush 19 whose base is fitted into the fitting cylinder portion 15 of one bearing seat 12 comes into contact with the inner surface of the plug 16 and is compressed, thereby absorbing the tolerance of each component. .

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

In FIG. 1, reference numeral 1 denotes a metal socket, and this socket 1 has a housing 3 integrally provided at the tip of a screw shaft portion 2, and a substantially cylindrical inner chamber 4 is formed inside this housing 3. Along with being there,
Openings 5 and 6 are formed at both ends of this interior chamber 4.

7 is a metal ball stud, and this ball stud 7 has a ball head 8 at one end, and
A shaft portion 9 is integrally connected to the ball head 8, and a threaded portion 10 is provided at the tip of the shaft portion 9. The ball head 8 is disposed within the inner chamber 4 of the socket 1, and the shaft portion 9 is located inside the socket 1.
It extends outward from an opening 5 at one end.

Reference numerals 11 and 12 denote a pair of bearing seats interposed between the wall surface of the inner chamber 4 of the socket 1 and the outer surface of the ball head 8 of the ball stud 7. Each of the bearing seats 11 and 12 has excellent durability. A spherical seat surface 13, 1 that is made of hard synthetic resin such as polyacetal resin or polyester resin, or steel that exhibits abrasion and frictional properties, and is in contact with the spherical head 8.
It has 4. In addition, one of the lower bearing seats 12 in the figure has a cylindrical fitting tube part 15 extending toward the opening 6 at the other end of the socket 1 at the center part away from the spherical seat surface 14. It is integrally protruded.

Reference numeral 16 denotes a metal plug attached to the opening 6 at the other end of the socket 1 by caulking, and a spring washer 17 is attached to the inner surface of the plug 16 and the lower surface of the one bearing seat 12 as shown in the figure.
A tapered coil spring 18 is stretched in a compressed state between.

In addition, the bearing seat 12 and the plug 16
A bushing 19 made of an elastic synthetic resin such as polyester resin or urethane resin is interposed between the inner surface of the holder and the inner surface of the holder. As shown in FIG. 2, this bushing 19 has a through hole 20 in the center and an annular step 21 on the outer periphery. The bearing seat 12 is fitted into the fitting cylindrical portion 15 of the bearing seat 12 .
Further, a curved portion 22 is formed on the lower surface of the bush 19 that contacts the plug 16, and this curved portion 22 contacts the inner surface of the plug 16 and is compressed. absorbs the total tolerance of Note that the bush 19 can be selected from various hardnesses depending on the desired rigidity of the ball stud 7 in the axial direction.

In addition, in FIG. 1, 23 is a dust cover,
24 is its retaining clip.

In such a configuration, when assembling each part,
The curved part 22 of the bush 19 whose base is fitted into the fitting cylinder part 15 of one of the bearing seats 12 comes into contact with the inner surface of the plug 16 and is compressed. The bearing seat 12 is placed at a position away from the spherical seating surface 14 of the bearing seat 12, and the contact surface against the plug 16 is a curved portion 22, so that the degree of contact against the plug 16 changes smoothly. Therefore, by changing the degree of contact of the curved portion 22 according to variations in the axial dimensions, it is possible to satisfactorily absorb the axial tolerance of the ball stud 7 of each component.

In addition, when in use, the ball head 8 of the ball stud 7 rotates relative to the socket 1, and the ball head 8 of the ball stud 7 or the bearing seat 11,
12, the pressing force of the coil spring 18 interposed in a compressed state acts between the bearing seat 12 and the plug 16, and the ball head 8 of the ball stud 7 and the bearing seats 11, 12
Compensate for gaps caused by wear.

[Effect of idea]

According to the present invention, when assembling each part, when the curved part of the bush whose base is fitted into the fitting cylinder part of one bearing seat comes into contact with the inner surface of the plug and is compressed, the bush has a spherical head. The sliding surface of the bearing seat is located away from the spherical seating surface of the bearing seat, and the contact surface against the plug is a curved part, so the contact with the plug changes smoothly. By changing the contact of the curved part depending on the variation in the axial dimension, the axial tolerance of the ball studs of each part can be well absorbed, the axial play or movement of the ball studs can be eliminated, and stable torque can be achieved. This makes it possible to obtain ball joints that are stable over the long term, have a long life, and are highly durable.

In addition, since the bush fits the base into the fitting tube of one bearing seat and is in contact with the plug, one bearing seat is loaded toward the center of the ball head, causing the ball head to move. By enclosing the bearing seat without any gaps, one bearing seat can be prevented from rotating, and stable operation can be obtained against the rotational oscillation of the ball stud.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an embodiment of the ball joint of the present invention, and FIG. 2 is an enlarged sectional view of a portion thereof. 1...Socket, 4...Inner chamber, 5, 6...Opening, 7...Ball stud, 8...Ball head, 9...
...Shaft part, 11, 12...Bearing seat, 1
3, 14... Ball seat surface, 15... Fitting cylinder part, 16...
...Plug, 18...Coil spring, 19...
Plug, 22...curved section.

Claims (1)

[Scope of claim for utility model registration] A socket having a substantially cylindrical inner chamber and openings formed at both ends of the inner chamber, a ball head disposed in the inner chamber of the socket, and a socket connected to the ball head. a ball stud having a shaft extending outward from an opening at one end of the socket; and a ball head interposed between the inner wall of the socket and the outer surface of the ball head of the ball stud. A ball comprising: a pair of bearing seats having contacting spherical seating surfaces; a plug attached to an opening at the other end of the socket; and a coil spring stretched between the one bearing seat and the plug. At the joint, a fitting cylinder part is integrally provided in the central part of the one bearing seat that is off the spherical seating surface and extends toward the opening at the other end of the socket, and the fitting cylinder part is integrally provided. A ball joint, characterized in that a base portion of a bush made of elastic synthetic resin that contacts the plug is fitted, and a curved portion is formed on the surface of the bush that contacts the plug.