JPH0738745U - Ball joint - Google Patents

Abstract

(57) [Summary] [Structure] An annular press-fitting metal fitting that forms an opening with a diameter smaller than the inner diameter of the housing is embedded in the large opening of the dust boot.
A ball joint characterized in that the large opening of the dust boot is fitted into the housing opening. [Effect] It is possible to produce a ball joint with stable sliding torque in mass production, and reduce the manufacturing process. It is possible to improve the sex.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ball joint used in, for example, a suspension system and a steering system of an automobile.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 2, a stud 102 including a handle 108 and a ball head 109, a sliding member sheet 103 that wraps the ball head 109 so as to be swingably rotatable, and a sliding member sheet 103. And the housing 106 into which the sliding member sheet 103 is fitted. The annular projection 125 formed in the opening of the housing 106 is caulked to fix the sliding member sheet 103. Further, the cylindrical dust boot 104 has a large opening 110 at one end fixed to the outer end of the opening of the housing 106, and a small opening at the other end is in close contact with the outer periphery of the handle 108 of the stud 102, and dust boots such as dust and earth from the outside. Prevents intrusion into the interior and maintains the durability of the ball joint 101. Examples of such ball joints are Japanese Examined Patent Publication No. 5-1094, Japanese Utility Model Publication No. 54-92275, and Japanese Utility Model Publication No. 5-3628.

Next, a method for manufacturing the ball joint 101 will be described. First, the stud 102 including the handle 108 and the ball head 109 is formed by forging and cutting. Then, the opening of the cup-shaped housing 106 is circumferentially cut to form the annular convex portion 125. Next, the ball head portion 109 of the stud 102 is inserted into the sliding member sheet 103, and the sliding member sheet 103 is press-fitted from the opening of the housing 106, and then the annular convex portion 125 is radially inward. The sliding member sheet 103 enclosing the stud 102 is fixed by crimping. A rubber elastic body is injection-molded and vulcanized and bonded to form a dust boot 104 having a substantially cylindrical shape and an annular ring 105 embedded in a large opening at one end. The large opening 110 of the dust boot 104 is press-fitted and fixed to the outer end of the opening of the housing 106, and the small opening 111 of the other end is brought into close contact with the stud 102 handle 108 to manufacture the ball joint 101.

[0004]

[Problems to be solved by the device]

 In the ball joint 101 as described above, the sliding member seat 103 is fixed by crimping the annular convex portion 125 in order to obtain a constant pull-out strength of the housing 106. Therefore, it is necessary to perform crimping after forming the annular convex portion 125 by cutting. Therefore, in mass production, there is a problem that the sliding torque of the ball joint varies due to the variation of the caulking load. In addition, the annular convex portion 125 needs to be cut or crimped, which complicates the processing step and reduces productivity.

Therefore, it is an object of the present invention to solve the above problems and to provide a ball joint which can manufacture a ball joint having a stable sliding torque and which can simplify the working process.

[0006]

[Means for Solving the Problems]

 The ball joint of the present invention has the following structure.

A handle and a stud that forms a ball head at an end of the handle, a cylindrical sliding member sheet that wraps the stud ball head swingably, and a sliding member sheet are fitted. A ball joint in which an outer shape cup-shaped housing to be fitted and a cylindrical dust boot are provided, one large opening of the dust boot is fixed to the housing opening, and the other small opening is closely attached to the handle. At, the annular press-fitting tool forming an opening having a diameter smaller than the inner diameter of the housing is embedded in the large opening of the dust boot, and the large opening of the dust boot is fitted into the opening of the housing.

[0008]

【Example】

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

First, the structure of the ball joint of the present invention will be described.

As shown in FIG. 1, reference numeral 2 denotes a ball stud including a ball head 9 and a cylindrical handle portion 8. A spiral screw groove 22 is formed at an end of the handle portion 8, and the screw A hexagonal nut is screwed into the groove 22 to form the large flange portion 12. Reference numeral 3 denotes a cup-shaped synthetic resin sliding member sheet, the inside of which is recessed into a spherical shape, a circumferential chamfered portion 21 is formed on the inner circumference of the outer end of the opening, and the ball stud 2 ball head 9 is attached. It wraps and swings freely. Then, the sliding member seat 3 which wraps the ball stud 2 and the ball head 9 in a swingable manner is fitted inside the outer cup-shaped housing 6. A cylindrical rod 13 having a hexagonal columnar flange 14 extends from the outer wall of the housing 6 perpendicularly to the stud biaxial direction. Reference numeral 4 denotes a substantially cylindrical dust boot, and one end large opening 10 is a cup-shaped sliding member. An annular press-fitting metal fitting 5 having an L-shaped cross section having an opening smaller than the outer diameter of the seat 3 is embedded in the housing 6. The other end small opening 11 is fixed to the outer circumference of the opening, and is in contact with the outer circumference of the stud 2 handle 8 and the lower end of the large flange 12 in an annular shape.

Next, a method for manufacturing the above ball joint will be described.

First, the handle 8 and the ball head 9 of the stud 2 are formed by forging and cutting. A screw groove 22 is formed in the handle portion 8 by a rolling process, and a hexagonal nut is screwed into the screw groove 22 to form a large flange portion 12. Further, the cup-shaped housing 6 is formed by cutting the inner circumference, the outer circumference and the opening end, and the cylindrical rod 13 is welded to the outer wall of the cup-shaped housing 6. Further, the sliding member is resin-molded to form the cup-shaped sliding member material sheet 3. Next, after inserting the stud 2 ball head 9 into the opening of the sliding member sheet 3, the sliding member sheet 3 is press-fitted from the opening of the housing 6. Further, the rubber elastic body is injection-molded and vulcanized and adhered to form a substantially cylindrical shape, and an annular press-fitting fitting 5 having an L-shaped cross section having an opening at one end with a diameter smaller than the outer diameter of the sliding member sheet 3. Make the dust boots 4 embedded in. The dust boot 4 large opening 10 is press-fitted until it hits the opening end 15 of the housing 6, and at the same time the other end small opening 11 is brought into close contact with the outer periphery of the stud 2 shank 8 and finally the shank 8 of the stud 2. A hexagonal nut is screwed into the screw groove 22 to form the large flange portion 22 and the other end small opening portion 11 is brought into close contact with the lower end of the large flange portion 22.

Therefore, the annular press-fitting metal member 5 having an opening having a diameter smaller than the inner diameter of the housing 6 is embedded in the large opening 10 of the dust boot 4, and the large opening 10 of the dust boot 4 is fitted into the opening of the housing 6. Since they are combined, it is not necessary to form the annular convex portion by cutting as in the conventional example, and caulking is also unnecessary. Further, when the force for pulling out the stud 2 acts, since the inner diameter of the large opening 10 of the dust boot 4 is smaller than the outer diameter of the sliding member sheet 3, the upper end of the sliding member sheet 3 opens at the opening of the housing 6. Since the annular press-fitting fitting 5 fitted to the outer periphery is fixed at the lower end 16 of the large opening 10 of the dust boot 4 in which the sliding boot is inserted, the sliding member sheet 9 for enclosing the stud 2 can be removed from the housing 6. Never.

Moreover, since the lower end 16 of the large opening 10 of the dust boot 4 in which the annular press-fitting metal 5 is embedded in the opening end 15 of the housing 6 is butted, the sliding member sheet 3 is compressed in the axial direction of the stud 2. Can be easily obtained with high dimensional accuracy. By the way, the sliding torque of the ball joint 1 largely depends on the dimension in which the sliding member 3 is compressed in the axial direction of the stud 2. In the present invention, since the lower end 16 of the large opening 10 of the dust boot 4 in which the annular press-fitting metal 5 is embedded in the opening end of the housing 4 is butted, the compression dimension is the length of the opening end face and the bottom in the axial direction of the housing 4. Although it is almost determined by the above, since it is a part where high dimensional accuracy can be easily obtained by cutting, etc., variation in sliding torque due to variation in caulking load does not occur in mass production as in the conventional example.

[0015]

[Effect of device]

 As described above, according to the present invention, an annular press-fitting metal fitting having an opening having a diameter smaller than the inner diameter of the housing formed in the large opening of the cylindrical dust boot is embedded in the large opening of the dust boot. Since the large opening is fitted in the housing opening, it is possible to produce a ball joint with stable sliding torque in large-scale production, and the number of processing steps is reduced, and productivity can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional plan view showing a ball joint of the present invention.

FIG. 2 is a vertical cross-sectional plan view showing a conventional ball joint.

[Explanation of symbols]

 2 Stud 3 Sliding member sheet 4 Dust boot 6 Housing 8 Handle 9 Ball head 10 Large opening 11 Small opening

Claims (1)

[Scope of utility model registration request] 1. A handle (8), a stud (2) forming a ball head (9) at an end of the handle (8), and swinging the ball head (9) of the stud (2). Cylindrical sliding member sheet (3) rotatably wrapping, outer cup-shaped housing (6) into which the sliding member sheet (3) is fitted, and cylindrical dust boot (4) And a large opening (10) at one end of the dust boot (4) is provided in the housing (6).
It is fixed to the opening and the other end small opening (11) is the handle (8).
In the ball joint closely contacted with the dust boot (4), an annular press-fitting metal fitting forming an opening having a diameter smaller than the inner diameter of the housing (6) is embedded in the large opening (10) of the dust boot (4). Ball joint, characterized in that a large opening (10) of said is fitted into said housing opening.