JPH0566325U - Ball joint - Google Patents

Abstract

(57) [Summary] [Structure] The bearing 2 comprises a ball stud 1, a bearing 2 which is an integrally molded product of synthetic resin, and a socket 3,
Is fitted in the socket 3 and the spherical portion 11 of the ball stud is fitted in the inner cavity portion 22 of the bearing 2 so that the socket outer peripheral portion 3
In a ball joint formed by squeezing and deforming the upper portion of 1, the shape of the body 2 of the bearing 2 before the assembling is a cylindrical shape that conforms to the inner circumference of the socket 3 before the squeezing and deformation, and a sphere that conforms to the spherical portion 11. The shape is intermediate to the shape. [Effect] As described above, the spherical portion 11 can be easily fitted into the bearing inner cavity portion 22 and the socket outer peripheral portion 3
Since the degree of deformation of the bearing body 21 to the inside due to the restriction deformation of No. 1 is small, the bearing body 21 is reasonably deformed, and the inner cavity 22 is pressed evenly and evenly to the spherical portion 11. Can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ball joint.

[0002]

[Prior Art]

 A ball stud having a spherical portion at one end, a synthetic resin bearing for fitting and holding the spherical portion of the ball stud, and a socket for press-fitting and fixing the bearing are used to connect various links. Conventionally, a ball joint is constructed by press-fitting a bearing fitted with a spherical part from the upper opening of the socket, then squeezing and deforming the outer peripheral part near the opening of the socket inward to fix the bearing inside the socket. More widely used.

In the ball joint of the above type, if the shape of the bearing near the spherical portion fitting opening before assembly is made into a spherical shape that substantially matches the spherical portion of the ball stud, it becomes impossible to fit the spherical portion. Become. Therefore, in the past, the shape near the opening of the bearing was made into a substantially cylindrical shape that conforms to the inner peripheral portion of the socket before drawing deformation, which facilitates the fitting and assembly of the ball stud spherical portion, and the drawing deformation of the outer peripheral portion of the socket results in a bare ring. It is general that the above-mentioned cylindrical portion is pressed and deformed inward to form a spherical shape that embraces the spherical portion.

[0004]

[Problems to be solved by the device]

 If the shape near the opening of the bearing is configured to be almost cylindrical as in the above-mentioned conventional method, the ball stud spherical portion can be easily fitted and assembled, but the degree of deformation of the bearing when the outer peripheral portion of the socket is deformed However, there is a problem that it is very difficult to make the inner peripheral surface of the bear ring uniformly and uniformly contact the spherical portion when the ball joint is completed.

The present invention aims to address the above-mentioned conventional problems.

[0006]

[Means for Solving the Problems]

 The present invention is a ball joint of the type in which the opening side portion of the socket outer peripheral side is squeezed and deformed inward and assembled and fixed as described above, in the vicinity of the upper opening portion of the bearing integrally formed of synthetic resin. It is characterized in that the shape of the body portion before assembling is configured to be an intermediate shape between a cylindrical shape that conforms to the inner circumference of the socket before drawing deformation and a spherical shape that conforms to the ball stud spherical portion.

[0007]

[Action]

 In the above, the inner diameter of the upper opening of the bearing is smaller than the outer diameter of the equatorial surface of the ball stud spherical portion, but the difference in diameter is slight.Therefore, the upper opening of the bearing is slightly expanded by press fitting the spherical portion. It is fitted while being elastically deformed. When the outer peripheral part of the socket is deformed by drawing inward, the amount of deformation of the bearing body is small, and it is relatively easy to press the spherical part evenly and evenly, improving the quality of the ball joint and simplifying the assembly work. Can be measured. When the present invention is applied to a bearing in which a plurality of grease grooves are formed in the bore, the grease groove absorbs the deformation when the body of the bearing is deformed inward due to the squeezing deformation of the outer periphery of the socket. Therefore, the deformation of the bearing body can be performed more reasonably and reliably.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a ball stud having a spherical portion 11 at its lower end, 2 is a bearing integrally formed of synthetic resin, and 3 is a socket.

The socket 3 is a substantially cylindrical member having an outer peripheral portion 31 and a bottom 32 and an open upper portion, and the inner periphery thereof is a step portion 34 projecting inward from the lower end of the upper large diameter portion 33. Is formed to extend from the stepped portion 34 to the taper receiving surface 35 of the lower pot, and to be slightly downward from the minimum diameter portion to be continuous with the bottom surface 36. In the state where the bearing 2 in which the spherical portion 11 of the ball stud 1 is fitted is assembled in the socket 3, the stepped portion 34 projects over the entire circumference at a position approximately midway between the equatorial plane and the lower end of the spherical portion 11. It is formed.

The bearing 2 has an inner cavity portion 22 into which the spherical portion 11 of the ball stud 1 is fitted inside the body portion 21 fitted into the large diameter portion 33 of the socket 3, and the lower end of the body portion 21. The outer periphery has a shoulder portion 23 that abuts on the stepped portion 34 of the socket 3, and the lower side of the shoulder portion 23 is a bottom portion 24 that substantially matches the tapered receiving surface 35 and the bottom surface 36 of the socket 3. It is made of synthetic resin and integrated. A plurality of grease grooves 25 are formed in the inner cavity 22 in the meridian direction, and the lower end of the grease groove 25 communicates with a grease reservoir 26 formed in the center of the lower end of the inner cavity 22. Is becoming

A portion of the bearing 2 on the upper opening side of the body portion 21, that is, a portion of the ball stud spherical portion 11 above the equatorial plane XX is located in the large diameter portion 33 of the socket as shown by a chain line in FIG. An intermediate shape between a suitable cylindrical shape and a spherical shape suitable for the ball stud spherical portion, that is, a shape in which the upper opening side is slightly inwardly closed.

The bearing 2 thus configured is fitted into the socket 3, and the spherical portion 11 of the ball stud 1 is press-fitted into the inner cavity portion 22 from the upper opening of the bearing 2. At this time, even if the inner diameter of the upper opening is smaller than the outer diameter of the equatorial plane of the spherical portion 11, the difference in diameter is extremely small, and the bearing 2 is made of synthetic resin and has some elasticity. Therefore, the opening is slightly expanded and elastically deformed by the press-fitting of the spherical portion 11, so that the spherical portion 11 is easily fitted into the lumen portion 22. Next, the upper portion (the portion above the equatorial plane XX) of the outer peripheral portion 31 of the socket 3 is deformed by drawing inward to make a ball joint completed product as shown by the solid line in FIG. Since the degree of deformation of the bearing 2 to the inside of the body portion 21 is relatively small, the body portion 21 of the bearing 2 presses against the spherical portion 11 without difficulty. In this case, since the plurality of grease grooves 25 are provided in the inner cavity portion 22 of the bearing 2, the inward deformation of the body portion 21 can be absorbed by the plurality of grease grooves 25, and the inner cavity portion 22 has the spherical portion 11. It can be easily transformed into a state in which it is evenly and evenly joined. It should be noted that the upper portion of the grease groove 25 is somewhat crushed due to the deformation absorption of the bearing body portion 21 as shown by the solid line in FIG. 1, but is configured so that the function as a grease groove for lubrication can be sufficiently secured. Needless to say.

[0014]

[Effect of the device]

 As described above, according to the present invention, the ball stud and the bearing and socket made of synthetic resin that fit and embrace the spherical portion of the ball stud are provided. In a ball joint of the type in which the upper part is deformed by drawing inward, the shape of the body before assembly near the upper opening of the bearing is a cylindrical shape that matches the inner circumference of the socket before drawing deformation. By adopting a shape intermediate to the spherical shape that fits the socket, it is possible to easily fit the spherical portion into the bearing inner cavity, and also to transform the bearing outer surface into the bearing surface shape by drawing deformation. It is easy and reliable, and it is possible to obtain a ball joint with excellent quality, which can bring a great practical effect in combination with cost reduction. Than it is.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of a bearing body portion of the ball joint shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball stud 2 Bearing 3 Socket 11 Ball part 21 Body part 22 Lumen part 24 Bottom part 25 Grease groove 31 Outer peripheral part 32 Bottom

Claims (2)

[Scope of utility model registration request] 1. A ball stud having a spherical portion at a lower end thereof, a synthetic resin bearing having an inner cavity portion for fitting and holding the spherical portion, an outer peripheral portion and a bottom, and an opening portion at an upper portion. It consists of a substantially cylindrical socket with a bearing, the bearing is installed in the socket, the spherical portion of the ball stud is fitted in the bore of the bearing, and the outer peripheral portion of the socket on the side of the opening is squeezed and deformed inward. In the configured ball joint, the shape before assembly of the body near the upper opening of the bearing is set to an intermediate shape between the cylindrical shape that matches the inner circumference of the socket before the throttle deformation and the spherical shape that matches the spherical part. A ball joint characterized by being configured. 2. The ball joint according to claim 1, wherein a plurality of grease grooves are provided in the bore of the bearing in the meridian direction.