JPH0768663A - Manufacture of bearing member - Google Patents

Abstract

PURPOSE:To eliminate an inner peripheral flange and to obviate control of a rocking angle of a ball joint by removing an outer die after a synthetic resin material is filled between inner and outer dies and cured, allowing a pin to protrude from the dies, pressing a bottom of a slit of a bearing member, and removing the member. CONSTITUTION:An upper die 32 is moved down until it is brought into contact with a slit forming part 53, a lower die 36 is moved up until the die 36 is brought into contact with the part 53, and a side guide 34 is moved forward until it is brought into contact with a protrusion 54, thereby forming a blocked space 56 between inner and outer dies 51 and 31. Then, a synthetic resin is filled in the space 56 from an injection nozzle 35, the dies 32, 36 and the guide 35 are retracted after curing, and a bearing member 2 is mounted on an outer periphery of a spherical die 52 of the die 51. Eventually, a plurality of pins 57 are allowed to protrude from an opposite side end of the part 53 to press a bottom 5 of a slit 3 of the member 2, and the member 2 is removed from the die 51. As a result, an inner peripheral flange for pressing at the time of removing the member is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bearing member which is a constituent member such as a ball joint used in a suspension system of an automobile.

[0002]

2. Description of the Related Art Generally, a ball joint, as shown in FIG. 6, includes a ball stud 106 having a spherical ball head 107 and a stem portion 108 projecting from the ball head 107.
A bearing member 102 that encloses a ball head 107 of the ball stud 106 in a swingable and rotatable manner, and a housing 109 having one end that accommodates the bearing member 102. The housing 109 has an opening. A shoulder portion 120 is formed on the inner periphery near the side end portion, and a retaining ring 121 for preventing the ball stud 106 from coming off is seated on the shoulder portion 120. The bearing member 102 has a large opening 117 at one end through which the handle 108 of the ball stud 106 projects and a large opening 117.
Has a small opening 118 on the opposite side.

A method of manufacturing the bearing member 102 of the general ball joint 101 will be described with reference to FIGS. 9 to 11.

First, the mold for manufacturing the bearing member 102 is shown in FIG.
Describing on the basis of FIG.
It is composed of a spherical mold 152 having the same curvature as the inner circumference of 02 and a cylindrical handle mold 155 continuous with the spherical mold 152. The spherical pattern 152 is provided with a protruding portion 154 extending at the tip end on the side opposite to the handle pattern.
A plurality of slit forming portions 15 are provided on the outer circumference of the slit along the axial direction.
3 is provided. A plurality of pins 157 that can move forward and backward along the convex portion 154 in the axial direction are provided on the tip end of the spherical shape 152 on the side opposite to the handle. Further, 131 is an outer mold, which is an upper guide 133 and a lower guide 13 for holding the handle mold 155 of the inner mold 151.
7, an upper die 132 and a lower die 136 that come into contact with the slit molding portion 153 of the spherical mold 152 and define the outer peripheral side of the closed space 156 for molding the bearing member 102, and the spherical mold 1.
The side guide 134 abuts on the convex portion 154 of 52 and defines the side surface side of the closed space 156. Upper die 1
32 includes an injection nozzle 135 that fills the closed space 156 with a synthetic resin material.

When manufacturing the bearing member 102 with the above-mentioned mold, the inner mold 1 is previously prepared with the upper guide 133 and the lower guide 137.
While holding the handle mold 155 of 51, the upper die 132 is lowered from above until it comes into contact with the slit forming portion 153, and the lower die 136 is raised from below until it comes into contact with the slit forming portion 153, and the side guide 134 is brought into contact with the inner metal. Mold 151
9 is moved forward until it comes into contact with the convex portion 154 in the axial direction of FIG.
As shown in FIG. 5, a closed space 156 is formed between the inner mold 151 and the outer mold 131. Next, the closed space 156 is filled with the synthetic resin material from the injection nozzle 135, and after the synthetic resin material is cured for a certain period of time, the upper die 132, the lower die 136 and the side guide 134 are retracted, and as shown in FIG. ,
The bearing member 102 is mounted on the outer periphery of the spherical mold 152 of the inner mold 151. Finally, as shown in FIG. 11, the inner mold 15
The plurality of pins 157 protrude from the tip end of the spherical mold 152 of the first type on the side opposite to the handle, and the bottom 105 of the bearing member 102 is pressed to remove the bearing member 102 from the inner mold 151.

In such a uniaxial type ball joint 101, as shown in FIG.
The large opening 117 for projecting 8 has a larger diameter than the small opening 118 for the other end, and the diameter of the bottom portion 105 on the small opening 118 side is small. Therefore, when removing the bearing member 102 from the inner mold 151, the plurality of pins 15 protruding from the inner mold 151 are removed.
7 can press the bottom portion 105 of the bearing member 102 having a small diameter.

On the other hand, as shown in FIG. 1, in the double shaft type ball joint 1, both openings 1 of the bearing member 2 are formed.
Since the shaft portions 8 and 8 of the ball stud 6 project from 7 and 18, both openings 17 and 18 must have the same diameter and large diameter. There are many double-shaft type ball joints using such a bearing member 2 such as Japanese Utility Model Laid-Open No. 1-173519 and Japanese Utility Model Laid-Open No. 4-1719.

[0008]

The bearing member 2 of the ball joint 1 of the above-mentioned biaxial type has the openings 17 and 18 of the same diameter and a large diameter. Therefore, when the bearing member 2 is manufactured, it is pressed by a pin. There is no. Therefore, as shown in FIG. 8, the inner peripheral flange 2 for pressing the inner peripheral side of the one end opening 218 with a pin.
08 is formed. As a result, when the bearing member is removed from the inner die, the inner peripheral flange 20 is fixed by the pin.
The bearing member can be removed by pressing 8.

However, when the inner peripheral flange 208 is formed on the inner peripheral side of the one end opening 218, the inner diameter of the one end opening 218 becomes smaller than the other end opening 217. Here one end opening 21
If the diameter of the ball stud 8 is small, the inner diameter of the ball stud 6 may restrict the swing angle of the ball stud 6 because the ball stud 6 is a double shaft type.

Therefore, the present invention provides a manufacturing method for forming a bearing member in a biaxial type ball joint in which the swing angle is not restricted.

[0011]

The structure of the present invention is as follows.

A first step of filling a synthetic resin material with the inner die defining the inner periphery of the bearing member and the outer die defining the outer periphery of the bearing member closed, and the curing of the synthetic resin material. After that, a second step of removing the outer mold and projecting the pin from the inner mold to press the slit bottom of the bearing member to remove the bearing member from the inner mold.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a ball joint 1 of a biaxial type. 6 is a ball stud, which is composed of a spherical ball head 7 and two handle portions 8 which coaxially project from the ball head 7.
The ball stud 6 has a hollow shape in which a through hole 19 is formed in the axial center, and the boots 16, 16 are formed around the outer circumferences of the handle portions 8, 8.
Sixteen mounting parts 21, 21 are formed.

The bearing member 2 is arranged on the outer peripheral side of the ball head 7 of the ball stud 6. The bearing member 2 has an inner spherical surface 4 having substantially the same curvature as the outer peripheral surface of the ball head 7, and encloses the ball head 7 swingably and rotatably. The bearing member 2 is a composite material made of a low friction material and has an extremely small coefficient of friction and excellent wear resistance.

A substantially cylindrical metal housing 9 is disposed on the outer peripheral side of the bearing member 2, and a first flange portion 10 extending to the outer peripheral side is formed at one end of the housing 9. At the other end of the housing 9, a caulking portion 11 having a thinner wall thickness than the other portions of the housing 9 is formed. A circumferential flange 22 is formed on the inner circumference of the housing 9 to restrict the axial movement of the bearing member 2. One end of the bearing member 2 abuts on the flange 22. Also, the caulked portion 1 of the housing 9
An annular retaining ring 12 having an L-shaped cross section is fitted to the inner periphery of the bearing member 1 so as to come into contact with the other end of the bearing member 2.
The retaining ring 12 is fixed to the inner circumference of the housing 9 by caulking the tip of the bearing 1, and movement of the bearing member 2 in the axial direction is restricted. An outer cylinder 14 made of metal is concentrically arranged on the outer peripheral side of the housing 9 at intervals. A second flange portion 15 extending to the outer peripheral side is formed at one end of the outer cylinder 14 on the side where the first flange portion 10 of the housing 9 is formed, and the housing 9 including the first flange portion 10 is formed. A rubber elastic body 13 is provided between the outer cylinder 14 and the outer cylinder 14 including the second flange portion 15. The inner peripheral surface and the outer peripheral surface of the rubber elastic body 13 are vulcanized and bonded to the housing 9 and the outer cylinder 14, respectively.

Between the outer circumferences of the handle portions 8 of the ball stud 6 and the inner circumferences of both ends of the housing 9, boots 16, 16 for preventing water, dust and the like from entering the ball joint 1 are provided.
Are installed respectively. The boots 16 are attached to the peripheral mounting portions 21 and 21 formed on the outer circumferences of the handle portions 8 of the ball stud 6.
16 small openings are mounted, and the boots 16, 1 are attached to the inner circumference of the housing 9 on the side of the collar 22 and the inner circumference of the retaining ring 12.
6 large openings are press fit.

A method of manufacturing the bearing member 2 of the ball joint 1 will be described with reference to FIGS.

First, a die for manufacturing the bearing member 2 will be described with reference to FIG. 3. Reference numeral 51 denotes an inner die, which is a sphere 52 having the same curvature as the inner circumference of the bearing member 2 and a circle continuous to the sphere 52. It is composed of a column-shaped handle 55. A protruding portion 54 extending from the tip end of the spherical mold 52 on the side opposite to the handle is provided, and from the spherical mold 52 to the handle 55,
A plurality of slit forming parts 5 are provided on the outer circumference along the axial direction.
3 is provided. A plurality of pins 57 that can advance and retreat in the axial direction are provided at the tip end of the slit forming portion 53 on the side opposite to the handle. Further, 31 is an outer mold, which is in contact with the upper guide 33 and the lower guide 37 for holding the handle mold 55 of the inner mold 51, and the slit molding portion 53 of the spherical mold 52, and a closed space 56 for molding the bearing member 2. The upper die 32 and the lower die 36 that define the outer peripheral side of the above, and the side guide 34 that abuts the convex portion 54 of the spherical mold 52 and defines the side surface side of the closed space 56.
The upper die 32 includes an injection nozzle 35 that fills the closed space 56 with a synthetic resin material.

When manufacturing the bearing member 2 with the above-mentioned mold, the handle 5 of the inner mold 51 is previously formed by the upper guide 33 and the lower guide 37.
5, the upper die 32 is lowered from above until it comes into contact with the slit forming portion 53, and the lower die 36 is raised from below until it comes into contact with the slit forming portion 53, and the side guide 34 is moved along the axis of the inner die 51. In this direction, it is moved forward until it abuts the convex portion 54, and as shown in FIG. 3, a closed space 56 is formed between the inner mold 51 and the outer mold 31. Next, the synthetic resin material is filled into the closed space 56 from the injection nozzle 35, and after the synthetic resin material is cured for a certain period of time, the upper die 32, the lower die 36 and the side guide 34 are retracted, and as shown in FIG. The bearing member 2 is mounted on the outer periphery of the spherical mold 52 of the inner mold 51. And finally, as shown in FIG.
A plurality of pins 57 protrude from the tip of the non-handle die side of 3 to press the slit 3 bottom portion 5 of the bearing member 2 to push the inner die 51 from FIG.
Manufacturing is completed by removing the bearing member 2 as shown in FIG.

Therefore, as described above, after the mold is filled with the synthetic resin material and cured, the bottom 57 of the slit 3 of the bearing member 2 is pressed by the pin 57 to remove the bearing member 2 from the inner mold 51. It is not necessary to form an inner peripheral flange for pressing with the pin 57 on the inner periphery of the opening.

[0022]

As described above, according to the present invention, the method for manufacturing the bearing member closes the inner die defining the inner circumference of the bearing member and the outer die defining the outer circumference of the bearing member. First step of filling the synthetic resin material in the state, and after curing the synthetic resin material, remove the outer mold and project the pin from the inner mold to press the bottom of the slit of the bearing member to press the bearing member from the inner mold. Since there is no need to form an inner peripheral flange for pressing with a pin on the inner periphery of the opening of the bearing member, a bearing member in which the swing angle of the ball joint is not regulated is formed. Can be molded.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing a biaxial type ball joint.

FIG. 2 is a cross-sectional plan view showing a bearing member used in a biaxial type ball joint.

FIG. 3 is a partial cross-sectional plan view showing a first step in the method for manufacturing a bearing member according to the present invention.

FIG. 4 is a partial cross-sectional plan view showing a second step (first half) in the method for manufacturing a bearing member according to the present invention.

FIG. 5 is a partial cross-sectional plan view showing a second step (second half) in the method for manufacturing a bearing member according to the present invention.

FIG. 6 is a sectional plan view showing a general one-axis type ball joint.

FIG. 7 is a cross-sectional plan view showing a bearing member used for a single-shaft type ball joint.

FIG. 8 is a cross-sectional plan view showing a conventional bearing member used in a biaxial type ball joint.

FIG. 9 is a partial cross-sectional plan view showing a first step in the conventional method for manufacturing a bearing member.

FIG. 10 is a partial cross-sectional plan view showing a second step (first half) in the conventional method for manufacturing a bearing member.

FIG. 11 is a partial cross-sectional plan view showing a second step (second half) in the conventional method for manufacturing a bearing member.

[Explanation of symbols]

 2 bearing member 3 slit 5 bottom 31 outer mold 51 inner mold 57 pins

Claims (1)

[Claims] 1. A method of manufacturing a tubular bearing member having a slit (3) extending in the axial direction, the bearing member (2).
A first step of filling a synthetic resin material in a state in which the inner mold (51) defining the inner circumference of the bearing and the outer mold (31) defining the outer circumference of the bearing member (2) are closed. After the resin material is cured, the outer mold (31) is removed and the inner mold (51) is removed from the pin (5).
And a second step of removing the bearing member (2) from the inner die (51) by pressing the slit (3) bottom portion (5) of the bearing member (2) by projecting 7). A method of manufacturing a member.