JP2000035031A - Ball joint, and manufacture and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacture device for a ball joint for forgedly forming a housing at high dimensional accuracy, and improving manufacturing property. SOLUTION: One end of a nearly columnar raw material is drawn by forging to form a drawing raw material provided with a handle part adopted as a connection part. The drawing raw material is forgedly formed into an intermediate molding body, having a base inner chamber for opening a base opening part, by an intermediate forging and forming device. The end surface of a nearly cylindrical sleeve is made to abut on the base opening part of the intermediate molding body by a finishing forging and forming device, and also a nearly cylindrical outer tube part is insertedly fitted and made to adhere to the outer peripheral surface on the base opening part side, to regulate flowing of metal portion. A punching pin is press fitted into the base inner chamber of the intermediate molding body, and a surplus thickness part is banked on a position other than the adhering portion by the outer tube part, to form a padding part 20, thereby forgedly forming a first housing 11. A first ball head part 23 of a first ball stud 12 together with a first bearing seat 13 are housed in the housing 11 inner side, and an opening part 14 side is caulked into a small diameter, thereby assembling and forming a first ball joint 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball joint in which a housing for slidably housing a ball head of a ball stud is formed by forging, a method of manufacturing the same, and a device therefor.

[0002]

2. Description of the Related Art Conventionally, as a ball joint of this type, for example, a configuration described in Japanese Patent Application Laid-Open No. 10-34276 is known.

In the ball joint disclosed in Japanese Patent Application Laid-Open No. H10-34276, a substantially cylindrical material is housed in a substantially cylindrical die, and one end surface of the material has the same shape as the opening of the housing of the product. While the outer peripheral surface is regulated by the inner surface of the die, the intermediate forging device is pressed and molded to form an intermediate molded product. Then, the intermediate molded product is housed in a substantially cylindrical die of a finish forging device, and a substantially center of one end face of the intermediate molded product that is pressed is formed in a substantially columnar shape corresponding to the inner chamber of the product housing. Is press-formed at the tip of the punch pin, and the housing is finish forged by forging while regulating the inner peripheral surface of the inner chamber and the outer peripheral surface of the housing with the inner peripheral surface of the punch pin and the die.

[0004]

By the way, the opening of the housing of the ball joint and the height of the housing are connected to the ball head of the ball stud whose ball head is slidably housed in the inner chamber. Therefore, high dimensional accuracy is required because it affects the swing angle of the shaft portion derived from the opening and the pull-out strength of the ball stud.

[0005] Further, during forging, a material having a volume slightly larger than the volume of the housing of the product is used so as to prevent loss of function due to underfilling.

However, Japanese Patent Application Laid-Open No.
In the ball joint described in Japanese Patent Publication No. 6, when the finish forging is performed, since the inner peripheral surface and the outer peripheral surface are finish forged, there is a possibility that a surplus portion may be raised in a portion of the opening that is not regulated during the finish forging. However, there is a possibility that the swing angle of the shaft portion of the ball stud and the size of the opening which affects the pull-out strength of the ball stud may be varied, and there is a problem that a cutting process or the like must be performed to obtain high dimensional accuracy. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a ball joint capable of forging a housing with high dimensional accuracy and improving manufacturability, a method of manufacturing the same, and a device therefor.

[0008]

According to a first aspect of the present invention, there is provided a ball joint having an inner chamber having an opening at one end thereof, and a meat flow near the edge of the opening, the inner chamber, and the outer surface of the opening. A forged finish-molded housing whose outer surface is raised while the outer surface is regulated, a ball head slidably disposed in an inner chamber of the housing, and an opening of the housing connected to the ball head. A ball stud having a shaft extending from a portion, and an elasticity and rigidity which are slidably housed in the inner chamber of the housing, slidably enclose the ball head of the ball stud, and open an insertion hole through which the shaft is inserted. And a bearing seat having the following.

A housing having an inner chamber which is slidably disposed with the ball head of the ball stud contained in the bearing seat and has an opening at one end and an opening extending from the shaft of the ball stud is formed by opening the housing. In order to finish the forging by raising the extra thickness on the outer surface while regulating the meat flow near the edge of the opening between the part and the inner chamber and the outer surface, by raising the extra thickness on the outer surface of the housing where high dimensional accuracy is not required, It is possible to form with high dimensional accuracy without complicated cutting work only by forging without loss of function due to underfilling, and productivity is improved.

According to a second aspect of the present invention, there is provided a method for manufacturing a ball joint, comprising: a housing having an inner chamber having an opening at one end; a ball head slidably disposed in the inner chamber of the housing; A ball stud having a shaft connected to the head and extending from the opening of the housing; and a ball head of the ball stud housed in an inner chamber of the housing and slidably enclosing the ball. A method for manufacturing a ball joint, comprising: forging and manufacturing the housing of a ball joint having an elastic and rigid bearing seat having an insertion hole that is inserted therein, and an edge of an opening of the housing and an opening on an outer surface. The inner surface of the inner chamber is press-formed while regulating the meat flow on the side, and the excess wall is raised to a position where the outer surface is not regulated, and the finish forging is performed.

A housing having an inner chamber which has a ball head of a ball stud contained in a bearing seat slidably disposed and an opening extending at one end and extending from a shaft of the ball stud is formed in the housing. In order to finish the forging by raising the extra thickness on the outer surface while regulating the meat flow near the edge of the opening between the part and the inner chamber and the outer surface, by raising the extra thickness on the outer surface of the housing where high dimensional accuracy is not required, It is possible to form with high dimensional accuracy without complicated cutting work only by forging without loss of function due to underfilling, and productivity is improved.

According to a third aspect of the present invention, there is provided a method of manufacturing a ball joint, comprising: a housing having an inner chamber having an opening at one end; a ball head slidably disposed in the inner chamber of the housing; A ball stud having a shaft connected to the head and extending from the opening of the housing; and a ball head of the ball stud housed in an inner chamber of the housing and slidably enclosing the ball. In a method of manufacturing a ball joint, the housing of a ball joint having an elastic and rigid bearing sheet having an insertion hole opened through the housing is forged and manufactured, a substantially center of one end surface of the material is formed into a substantially cylindrical shape. Press forming to form a concave intermediate molded body having an original inner chamber that opens an original opening on one end surface,
The inner surface of the former inner chamber is press-formed while regulating the flow of the edge of the former opening and the outer opening side of the outer surface of the intermediate molded body, and the excess is raised to a position where the outer surface is not regulated. Finish forging is performed.

[0013] Then, a substantially central portion of one end face of the material is pressed and formed into a substantially cylindrical shape to form a concave intermediate molded body having an original inner chamber opening the original opening, and the original opening of the intermediate molded body is formed. Pressurizing the inner surface of the original inner chamber while regulating the flow of meat at the edge of the opening and the outer opening side of the outer surface of the inner surface of the inner chamber, and raising the excess portion to a position where the outer surface is not regulated, and finishing and forging the housing. On the outer surface of the housing, which does not require high dimensional accuracy, it is possible to form with high dimensional accuracy without complicated cutting work only by forging without loss of function due to underfill, and productivity is improved. .

According to a fourth aspect of the present invention, there is provided a ball joint manufacturing apparatus having a housing having an inner chamber having an opening at one end, a ball head slidably disposed in the inner chamber of the housing, and the ball. A ball stud having a shaft connected to the head and extending from the opening of the housing; and a ball head of the ball stud housed in an inner chamber of the housing and slidably enclosing the ball. In a ball joint manufacturing apparatus for forging and manufacturing the housing of a ball joint provided with an elastic and rigid bearing seat having an insertion hole opened therein, an axis of the housing is provided at an edge of an opening of the housing. An opening regulating portion that abuts in the direction, a punch pin that presses and forms the inner surface of the inner chamber of the housing, and abuts only on the opening side of the outer surface of the housing, The excess thickness generated when the inner surface of the inner chamber of the housing is pressed and formed by the punch pin is formed on the outer surface of the housing while finish forging is performed while restricting the flow of the meat near the edge of the opening of the housing by the mouth restricting portion. And a radial direction regulating portion.

[0015] An opening restricting portion that axially contacts the edge of the opening of the housing, a punch pin that presses and forms the inner surface of the inner chamber of the housing, and an opening restricting portion that contacts only the opening side of the outer surface of the housing. Diameter for finishing forging by raising the extra thickness generated when the inner surface of the inner chamber of the housing is pressed and formed by the punch pin on the outer surface at the position where the flow is not restricted while restricting the flow of the meat near the edge of the opening of the housing due to With the direction regulating portion, the housing can be formed with high dimensional accuracy without performing complicated cutting work only by forging without loss of function due to underfill, and productivity is improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a ball joint according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a rack-and-pinion type steering device main body which constitutes, for example, a steering mechanism of an automobile. The rack-and-pinion type steering device main body 1 has a substantially bar-shaped rack bar 3 connected to a gear box 2. A first ball joint 4 which is a rack end ball joint attached to the tip of the first ball joint, and a second ball joint 5 which is a tie rod end ball joint attached to the tip of the first ball joint 4. are doing.

As shown in FIGS. 1 and 2, the first ball joint 4 has a substantially cylindrical first housing 11 made of metal and a first ball stud 12 made of metal. And the first bearing seat 13 made of synthetic resin.
And

The first housing 11 has an opening 14 at one end and a bottom surface 15 at the other end to form a substantially bottomed cylindrical inner chamber 16 inside. A connecting portion 18 provided with a male screw portion 17 on the peripheral surface is provided at substantially the center of the bottom surface of the bottom portion 15 of the first housing 11 so as to protrude along the axial direction.
Further, on the upper surface of the bottom surface portion 15 of the inner chamber 16 of the first housing 11, a substantially conical concave mounting surface portion 19 is formed. On the outer peripheral surface of the first housing 11, a wall-shaped built-up portion 20 is formed in the circumferential direction at a side opposite to the opening. Then, the connecting portion 18 is screwed into a female screw portion 21 provided on the inner peripheral surface of the front end of the rack bar 3 to form the first housing.
11 are integrally connected to the rack bar 3.

The first ball stud 12 has a substantially spherical first ball head 23 at one end. The first ball stud 12 is connected to the first ball head 23 via a small-diameter portion 24 through the first ball head 23. The shaft portion 25 is integrally connected, and a first screw portion of a male screw (not shown) is formed at the other end of the first shaft portion 25.

Further, the first bearing seat 13 is formed of a rigid synthetic resin having good rigidity and elasticity, such as polyacetal resin, having good bearing characteristics and good bearing characteristics, and has a first ball stud 12 at one end. A cylindrical body 27 is formed to open an insertion hole 26 into which the first ball head 23 is inserted. At the other end of the cylindrical body portion 27, a bottom portion 29 which opens a sliding hole 28 smaller in diameter than the diameter of the first ball head 23 is formed.
Is formed in a substantially cylindrical shape with a bottom. Then, the lower surface of the bottom portion 29 abuts on the mounting surface portion 19 of the bottom surface portion 15 of the first housing 11, and the first bearing sheet 13 is attached to the inner chamber of the first housing 11. Housed in 16. Further, the first bearing seat 13 has the first
The first ball head 23 of the ball stud 12 is slidably housed, and is caulked inward so that the opening 14 side of the first housing 11 has a small diameter, and is deformed to form a first ball joint. 4 are formed.

The rack and pinion type steering device body 1 is provided with a rack boot as a cover. The rack boot 31 is made of, for example, a synthetic resin such as polyamide, polyurethane, polyester, polyvinyl chloride, or polyolefin or rubber, and has a substantially bellows-shaped cylindrical portion 32. At one end of the cylindrical portion 32, a ring-shaped first portion is fitted and engaged with an engagement groove 33 provided in a concave groove along the circumferential direction on the outer peripheral surface of the gear box 2. One fitting portion 34 is provided. The other end of the cylindrical portion 32 is fitted and engaged with a not-shown groove formed in the first shaft portion 25 of the first ball stud 12 along the circumferential direction. A ring-shaped second fitting portion to be held is provided. Then, the rack boot 31 is attached so as to cover the rack bar 3 and the first ball joint 4.

Next, an operation of manufacturing the first ball joint 4 of the embodiment will be described with reference to the drawings.

First, as shown in FIG. 3A, a substantially cylindrical material 41 having a predetermined volume, that is, a volume slightly larger than the volume of the first housing 11 is used.

Then, the periphery of one end of the raw material 41 is chamfered by press forming as forging, and a chamfered raw material 43 provided with a tapered surface 42 as shown in FIG. 3B is forged.

Next, the tapered surface 42 of the chamfered material 43 is formed by drawing, and as shown in FIG. 3C, the handle portion 44 serving as the connecting portion 18 of the first housing 11 is formed into an unprocessed cylindrical portion. A drawing material 46 projecting substantially coaxially from one end of 45 is forged.

Further, the drawn material 46 is set up in a jig (not shown) having an inner diameter substantially equal to the outer diameter of the first housing 11, and is pressed in the axial direction to form an unprocessed cylindrical portion of the drawn material 46.
45 is formed into a large diameter so as to be substantially the same as the outer diameter of the first housing 11, and as shown in FIG.
An upsetting material 48 having a handle portion 44 protruding substantially coaxially from one end surface of a cylindrical portion 47 having substantially the same outer dimensions as the housing 11 is forged.

Then, the upsetting material 48 is forged into an intermediate molded body 51 shown in FIG.

As shown in FIG. 4, the intermediate forging apparatus 50 includes a lower mold part 52 for mounting and positioning and fixing the upsetting material 48, and a vertically movable upper part 52 for pressing and forming the upsetting material 48. Mold
53. And, in the lower mold part 52, the first
A substantially cylindrical upsetting recess 54 having substantially the same outer diameter as that of the housing 11 and a knockout recess 55 into which the handle portion 44 is fitted and fixed coaxially are provided in the upsetting recess 54. Further, in the knockout recess 55, a knockout pin 56 whose one end can move forward and backward from the knockout recess 55 is provided.

The upper mold part 53 has a substantially cylindrical case body 58.
And a substantially cylindrical pressing pin 59 provided substantially coaxially with the case body 58 so as to be able to advance and retreat. The pressing pin 59 is provided coaxially at the tip of the pressing portion 60 and a pressing portion 60 formed in a substantially cylindrical shape having a diameter substantially equal to the inner diameter of the upset recess 54 of the lower mold portion 52. The diameter is substantially the same as the inner diameter of the first housing 11 and the tip is the first housing 11.
A pin portion 61 substantially corresponding to the mounting surface portion 19 which is the bottom surface of the inner chamber 16 of FIG.
An inclined surface 62 is provided between the pressing portion 60 and the pin portion 61 having different diameters so that the diameter becomes smaller according to the pin portion 61 side.

At the time of molding by the intermediate forging apparatus 50, the upsetting material is inserted into the knockout recess 55 of the lower mold portion 52.
Insert the handle 44 of 48 and the column 47 of the upsetting material 48
Is inserted into the upsetting recess 54, and the upsetting material 48 is mounted on the lower mold portion 52.

In this state, the case body 58 of the upper mold portion 53 is lowered by a predetermined distance, and the tip of the pin portion 61 of the pressing pin 59 is connected to the upsetting material.
FIG. 3 is provided with a bottomed cylindrical portion 65 having an original inner chamber 64 for pressing the cylindrical portion 47 of the upsetting material 48 to open the original opening 63 by pressing against the end surface opposite to the side where the handle portion 44 of 48 protrudes. (E), the forging of the concave intermediate molded body 51 is performed. During the press molding of the pressing pin 59, the extruded flesh goes around the gap between the handle 44 and the knockout recess 55 to form the connecting portion 18 and also around the pin 61 of the pressing pin 59. Thus, the intermediate molded body 51 is formed by molding along the inclined surface of the pressing pin 59 to form the edge of the original opening 63. Note that the formed intermediate molded body 51 is taken out by moving the knockout pin 56 upward and pushing it out of the upset recess 54.

Next, the obtained intermediate molded body 51 is processed by a finish forging apparatus 67, which is an apparatus for manufacturing a ball joint, as shown in FIG.
(F), the first housing 11 is forged.

Here, as shown in FIG. 5, the finish forging apparatus 67 comprises a lower die 68 for positioning and fixing the intermediate molded body 51,
An upper mold 69 for press-molding the intermediate molded body 51 is provided. The lower die 68 has a substantially cylindrical mounting recess 70 for fitting and fixing the bottomed cylindrical portion 65 of the intermediate molded body 51 having substantially the same outer dimensions as the first housing 11, and a mounting recess 70. Further, a knockout recessed portion 55 for fitting and fixing the connecting portion 18 coaxially is provided. Further, in the knockout recess 55, a knockout pin 56 whose one end can freely advance and retreat from the knockout recess 55 is disposed similarly to the intermediate forging device 50.

The upper die 69 has a substantially cylindrical outer shell 72 serving as a case, and an outer cylinder serving as a substantially cylindrical radial regulating member provided substantially coaxially on the inner peripheral side of the outer shell 72. Portion 73, a sleeve 74 as a substantially cylindrical opening regulating portion provided on the inner peripheral side of the outer cylindrical portion 73 so as to be able to advance and retreat substantially coaxially, and advance and retract substantially coaxially on the inner peripheral side of the sleeve 74. And a substantially cylindrical punch pin 75 provided as possible. The inner diameter of the outer cylindrical portion 73 is formed to be substantially the same as the outer diameter near the opening 14 of the first housing 11. The punch pin 75 is formed to have a diameter substantially the same as the inner diameter of the inner chamber 16 of the first housing 11, and the distal end thereof is formed in the first housing 11.
It is formed in a shape substantially corresponding to the mounting surface portion 19 which is the bottom surface of the inner chamber 16. Further, an opening forming surface 76 that is in contact with the edge of the original opening 63 of the intermediate formed body 51 is provided at the leading edge of the sleeve 74.

In the upper mold 69, the lower end of the outer cylindrical portion 73 exposes a part of the intermediate molded body 51 installed in the lower mold, and the tip of the sleeve 74 comes into contact with the original opening 63 of the intermediate molded body 51. Then, it retreats at the original opening 63 and retreats to a position where movement is restricted. In the position where the retreat of the sleeve 74 is restricted, the opening forming surface 76 of the sleeve 74 and the mounting recess 70 of the lower die 68 are provided.
Is the height dimension of the first housing 11.

At the time of molding by the finish forging apparatus 67, the intermediate molded body is inserted into the knockout recess 55 of the lower die 68.
At the same time as inserting the connecting portion 18 of 51, the bottomed cylindrical portion 65 of the intermediate molded body 51 is fitted and fixed in the mounting concave portion 70, and the intermediate molded body 51 is attached and fixed to the lower mold 68. In a state where the connecting portion 18 is fixedly attached to the lower mold 68, the lower end surface of the connecting portion 18 contacts the end surface of the knockout pin 56.

In this state, the outer cylinder 72 is lowered by lowering the outer shell 72 of the upper die 69 so that a part of the intermediate molded body 71 on the side opposite to the original opening 63 is exposed and fitted. The opening forming surface 76 of the portion is brought into contact with the original opening 63 of the intermediate molded body 51. Thereafter, a punch pin 75 is pressed into the former inner chamber 64 of the intermediate molded body 51 so as to expand the bottomed cylindrical portion 65 of the intermediate molded body 51,
3 (f) by pressing with the outer cylinder 73 and the sleeve 74.
Is formed by forging. Due to the press-fitting of the punch pins 75, as shown in FIG. 5, extra portions are provided at positions that are not regulated at the respective portions of the lower die 68 and the upper die 69, that is, at exposed portions that are not covered by the outer cylinder portion 73. The raised portion 20 is formed by being extruded so as to be extruded.

Then, the punch pin 75 is lifted up and pulled out, and the outer shell 72 is raised while the sleeve 74 is moved in a direction protruding relative to the outer cylinder 73, so that the upper die 69 is raised.
Then, the knockout pin 56 of the lower mold 68 is moved upward to be pushed out of the mounting recess 70 after being knocked out of the mold.

Thereafter, the first ball seat 23 of the first ball stud 12 is covered with the first bearing seat 13,
The first bearing seat 13 is inserted into the inner peripheral side of the first housing 11 together with the ball head 23 of FIG. Then, the opening 14 of the first housing 11 is caulked inward so as to have a small diameter,
The first ball joint 4 is assembled and formed.

As described above, the first ball stud 12
The opening 14 and the height dimension of the first housing 11 that affect the swing angle and the pull-out strength of the first housing 11 are determined by changing the edge of the opening 14 and the outer peripheral surface near the edge of the opening 14 during forging. Forming the inner chamber 16 by pressing the inner surface side while regulating the height of the inner surface side, and raising the excess amount generated at the time of press forming on the inner surface side to an unregulated position on the outer peripheral surface where high dimensional accuracy is not required By finishing forging, it can be formed with a high degree of dimensional accuracy without the need for complicated work such as loss of function due to underfilling, it can be easily formed only by forging, and productivity can be improved. Can be improved.

The former inner chamber 64 which once opens the former opening 63
After forming the intermediate molded body 51 having a shape, the inner surface side of the original inner chamber 64 is pressed and finished while regulating the flow of the edge of the original opening portion 63 and the outer peripheral surface near the edge of the original opening portion 63. Because of forging, high dimensional accuracy can be easily obtained.

Then, a sleeve 74 axially abutting on the edge of the original opening 63 of the intermediate molded body 51, a punch pin 75 for pressing and molding the inner surface of the original inner chamber 64, and a primary opening on the outer surface of the intermediate molded body 51 Abutting only on the 63 side, the excess thickness generated when the inner surface of the original inner chamber 64 is pressed by the punch pin while restricting the meat flow near the edge of the original opening 63 by the sleeve 74 is the outer periphery of the meat flow restriction designated position. Since the finish forging is performed with the outer cylindrical portion 73 raised on the surface, the first housing 11 having high dimensional accuracy can be easily obtained with a finish forging device having a simple structure.

Also, compared to the cut and cut ones, it is tightened and hardened only by forging, and the pull-out strength can be improved.

In the above-described embodiment, the first ball joint attached to the rack bar 3 of the rack and pinion type steering device body 1 has been described, but any other ball joint can be used.

The material 41 was formed into a chamfered material 43, the chamfered material 43 was formed into a drawn material 46, the drawn material 46 was formed into an upset material 48, and the upset material 48 was formed into an intermediate molded body 51. After that, the first housing 11 is forged and described, but the intermediate molded body 51 may be directly formed from the material 41.

[0047]

According to the ball joint according to the first aspect of the present invention, finish forging is carried out by raising excess material on the outer surface while restricting the flow of meat between the opening of the housing and the edge of the opening of the inner chamber and the outer surface. Therefore, by embedding the extra thickness on the outer surface of the housing where high dimensional accuracy is not required, it is possible to form with high dimensional accuracy without complicated cutting work only by forging without causing loss of function due to underfill. Can be improved.

According to the method for manufacturing a ball joint according to the second aspect, finish forging is carried out by raising excess material on the outer surface while restricting the flow of the meat between the opening of the housing and the edge of the opening of the inner chamber and the outer surface. In this way, the excess wall is raised on the outer surface of the housing, which does not require high dimensional accuracy. Performance can be improved.

According to the method for manufacturing a ball joint according to the third aspect, a substantially intermediate center of one end face of the material is pressed and formed to form a concave intermediate molded body having an original inner chamber opening an original opening. Press-molding the inner surface of the former inner chamber while regulating the edge of the former opening of the intermediate molded body and the meat flow on the outer opening side of the outer surface,
The forging is carried out on the outer surface of the housing, which does not require high dimensional accuracy, because the surplus is raised to an unregulated position on the outer surface and the housing is finish forged. It is possible to mold with high dimensional accuracy without performing complicated cutting work only by using only it, and it is possible to improve manufacturability.

According to the apparatus for manufacturing a ball joint according to the fourth aspect, the punch pin for pressing and forming the inner surface of the inner chamber of the housing abuts only on the opening side of the outer surface of the housing, and the shaft of the shaft is connected to the edge of the opening of the housing. While restricting the flesh flow near the edge of the opening of the housing by the opening regulating portion abutting in the direction, the excess thickness generated when the inner surface of the inner chamber of the housing is pressed by the punch pin is reduced by the radial regulating portion. Since the finish forging is performed on the outer surface of the position that is not regulated, the housing can be molded with high dimensional accuracy without complicated cutting work only by forging without causing loss of function due to underfill, and productivity is improved. Can be improved.

[Brief description of the drawings]

FIG. 1 shows a first ball joint of a first embodiment of a rack and pinion type steering device body according to one embodiment of the present invention.
FIG. 4 is a cross-sectional view near the housing of FIG.

FIG. 2 is a partially cutaway plan view showing the main body of the rack and pinion steering device according to the first embodiment;

FIGS. 3A and 3B are explanatory views showing forging a first housing from the same material as above, and FIG. 3A is a cross-sectional view showing the material, and FIG.
Sectional view showing a chamfered material, (c) Sectional view showing a drawing material, (d) Sectional view showing an upsetting material, (e) Sectional view showing an intermediate molded body, (f) Sectional view showing a first housing It is.

FIG. 4 is a cross-sectional view showing a situation in which the intermediate molded body is forged by the intermediate forging apparatus.

FIG. 5 is a cross-sectional view showing a situation in which the first housing is forged by the finish forging apparatus.

[Explanation of symbols]

4 First ball joint as a ball joint 11 First housing as a housing 12 First ball stud as a ball stud 13 First bearing seat as a bearing seat 14 Opening 16 Inner chamber 20 Overlay 23 Ball Head 25 Shaft 26 Insertion hole 41 Material 51 Intermediate molded body 63 Former opening 64 Former inner chamber 67 Finish forging device that is a ball joint manufacturing device 73 Outer cylinder portion as a radial regulating portion 74 As an opening regulating portion Sleeve 75 Punch pin

Continuation of the front page (72) Inventor Hideyuki Chiba 500 Furukawa-cho, Hamamatsu-shi, Shizuoka F-term in Somic Ishikawa Hamamatsu Plant (reference) 3J105 AA22 AB02 CB44 CB62 CE02 CF02

Claims (4)

[Claims] 1. An inner chamber having an opening at one end thereof, and the outer wall has a surplus wall raised while finishing the flow near the edge of the opening, the inner chamber, and the outer surface in the vicinity of the opening. A forged housing; a ball stud having a ball head slidably disposed in an inner chamber of the housing and a shaft portion connected to the ball head and extending from an opening of the housing; An elastic and rigid bearing seat housed in the inner chamber of the housing and slidably enclosing the ball head of the ball stud and opening an insertion hole through which the shaft portion is inserted. Ball joint. 2. A housing having an inner chamber having an opening at one end, a ball head slidably disposed in the inner chamber of the housing, and an opening of the housing connected to the ball head. A ball stud having a shaft extending from a portion, and an elasticity and rigidity which are slidably housed in the inner chamber of the housing, slidably enclose the ball head of the ball stud, and open an insertion hole through which the shaft is inserted. A method of manufacturing a ball joint, comprising forging and manufacturing the housing of a ball joint provided with a bearing seat having a bearing seat, wherein the inner wall of the housing is controlled while restricting a meat flow on an edge of an opening of the housing and an opening on an outer surface. A method for manufacturing a ball joint, comprising press-molding an inner surface of a chamber, raising a surplus portion to an unregulated position on the outer surface, and performing finish forging. 3. A housing having an inner chamber having an opening at one end, a ball head slidably disposed in the inner chamber of the housing, and an opening of the housing connected to the ball head. A ball stud having a shaft extending from a portion, and an elasticity and rigidity which are slidably housed in the inner chamber of the housing, slidably enclose the ball head of the ball stud, and open an insertion hole through which the shaft is inserted. A method of manufacturing a ball joint, comprising: forging and manufacturing the housing of a ball joint having a bearing seat having: a substantially central portion of one end face of a material is pressed into a substantially cylindrical shape to form an original opening at one end face; Forming a concave intermediate molded body having an original inner chamber that opens the inner molded body, and pressing the inner surface of the original inner chamber while regulating the flow of the edge of the original opening and the outer surface of the intermediate molded body on the original opening side. Molded and surplus Method of manufacturing a ball joint, which comprises finishing forging enliven the position not to regulate the outer surface. 4. A housing having an inner chamber having an opening at one end, a ball head slidably disposed in the inner chamber of the housing, and an opening of the housing connected to the ball head. A ball stud having a shaft extending from a portion, and an elasticity and rigidity which are slidably housed in the inner chamber of the housing, slidably enclose the ball head of the ball stud, and open an insertion hole through which the shaft is inserted. An apparatus for manufacturing a ball joint forging and manufacturing the housing of a ball joint having a bearing seat having: an opening restricting portion that abuts an edge of an opening of the housing in an axial direction of the housing; A punch pin that presses and forms the inner surface of the inner chamber of the housing; A radial direction regulating portion that finishes and forges the excess wall generated when the inner surface of the inner chamber of the housing is pressed and formed by the punch pin while restricting the flow of meat in the vicinity, on the outer surface of the housing. Ball joint manufacturing equipment.