JPH02168012A - Manufacture of ball joint - Google Patents

Abstract

PURPOSE:To enable efficient manufacture with the value of torque easily set and vibration isolating effect held by assembling a small ball joint into a housing, before providing a variable gap between the inner-peripheral step portion of the housing and a shut-off plate to fill compounded rubber therein. CONSTITUTION:A ball stud 2, which has a small set ball joint 1a formed by covering a ball head portion 5 with a bearing 6, is assembled into a housing 8 and set into a supporting mold 30, and then a shut-off plate 17 is pressed by a press-in punch 33 into the inner periphery of the caulked portion 10 of the housing 8. At this time, it is pressed into with keeping a distance L1 between the inside face 19 of the shut-off plate 17 and the inner-peripheral step portion 11 of the housing 8, and fixed by filling compounded rubber into a gap 16 from an injected hole 34 and then curing it, pressing the shut-off plate 17 therein moreover and caulking the caulked portion 10. Therefore, the size of preload is adjusted by varying the distance L1 to grant vibration isolating effect and set the value of torque easily for improving manufacturing efficiency.

Description

[Detailed Description of the Invention] Purpose of the Invention [Industrial Application Field] The present invention is used for suspension mechanisms of automobiles, etc.
In particular, the present invention relates to a method of manufacturing a ball joint that has rubber for vibration isolation in the housing. .

[Conventional technology]

A ball joint having vibration-proof rubber in the housing is disclosed in Japanese Patent Application Laid-Open No. 55-6085, U.

There are S, P 3108830, etc.

[Problem to be solved by the invention]

As shown in FIG. 5, the ball head 20 of the ball stud 202
In the ball joint 201 in which a rubber layer 225 for vibration isolation is arranged between the ball joint 5 and the housing 208, vibrations transmitted to the ball joint 201 can be absorbed by the rubber layer 225. However, in order to follow the movement of the swinging and rotating ball stud 202, the rubber layer 225 is always used in a twisted state.

Therefore, the durability of the rubber layer 225 is low, and the pole joint 201 cannot withstand long-term use.

In this regard, as shown in FIG. 6, in the ball joint 301 in which a synthetic resin bearing 308 is interposed between the ball head 305 of the ball stud 302 and the rubber layer 325, the ball head 305 and the bearing 806 are interposed between the ball head 305 and the rubber layer 325. slides, the above-mentioned problem is solved. On the other hand, bearing 8
06 and the rubber layer 325 and the process of assembling them to the ball stud head 305 increases. Moreover, since this rubber layer 325 is formed in advance into a substantially hemispherical cup shape and is assembled into the housing 8.8, the housing 3.8 and the bearing 30.
It may not engage properly in the gap with 6, and a situation of uneven contact may occur.

Also, these pole joins) are shown in Figure 5.

This structure prevents the rubber layer and the ball stud from being pulled out from the housing by caulking annular caulking parts 210, 310 at the housing opening edge shown by two-dot chain lines in FIG. 6 in the radial direction.

Therefore, in this caulking process, the rubber layer is not sufficiently compressed, so it is difficult to adjust the amount of preload added (a small amount of force). As described above, the conventional method has a drawback in that it is difficult to easily secure a desired torque by adding preload.

SUMMARY OF THE INVENTION The object of the invention is to provide a method for producing a pole bond which overcomes the above-mentioned drawbacks.

Structure of the Invention [Means for Solving the Problem] A synthetic resin bearing of a size such that a cup-shaped gap is formed between the bearing and the inner peripheral surface of the cylindrical housing is attached to the ball head of the ball stud in the first step. In the second step, the ball stud is assembled into the housing to form a small ball joint, and in the third step, the small ball joint is set in the support mold, and in the fourth step, the large opening edge of the housing is assembled. A closing plate is press-fitted into the inner periphery of the annular caulked part formed in the cylindrical part of the housing, leaving a distance L1 between the caulked part and the inner circumferential stepped part formed continuously in the cylindrical part of the housing, and then in a fifth step. After filling the gap with compounded rubber through the injection hole at the appropriate location, vulcanization is performed, and the sixth
In the step, the closing plate is further press-fitted into the housing, and in the seventh step, the caulking portion of the housing is caulked to fix the closing plate.

[Examples and effects]

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a bear shape in which a small assembled pole stein (1B) is set in a support mold 30 and a closing plate 17 is enlarged in the method according to the first embodiment of the present invention.

In the figure, small assembly pole join) la is the ball head 5
A ball stud 2 with a bearing 6 mounted thereon is assembled into a housing 8. The support mold 30 includes an upper mold 31 and a lower mold 3
It consists of 2.

Further, 33 is a press-fitting punch for press-fitting the closing plate.

The ball stud 2 consists of a ball head 5 and a handle 3, and the handle 3 protrudes from a small opening 13 in a housing 8.The handle 3 has a straight part 4 having the same diameter over its entire length in the axial direction. 1. The bearing 6 is made of synthetic resin, and its inner peripheral surface and the outer peripheral surface of the ball head 5 of the ball stud 2 are slidable.

The housing 6 has a cylindrical shape having the aforementioned small opening 13 and a large opening 9 at the opposite end of the small opening 13. An annular caulking portion 10 thinner than the cylindrical portion 12 is provided at the edge of the large opening 9.
is formed to protrude in the axial direction.

The switching portion between the thick cylindrical portion 12 and the thin confusing portion 10 forms an annular inner circumferential stepped portion 11.

Further, a seven-lung portion 14 extending in the inner diameter direction is formed at the edge of the small opening I33.

A cup-shaped gap 16 is formed between the inner circumferential surface of the housing 8 and the outer circumferential surface of the bearing 6 described above.

The closing plate 17 is disk-shaped, and a tapered through hole 18 is formed in the center, and the diameter of the closing plate 17 expands by itself to the outside of the pole joint.

The support mold 30 has a cylindrical upper mold 31 divided into two parts in the radial direction.
and a cylindrical lower die 32. The upper mold 31 engages with the outer periphery of the cylindrical portion 12 of the housing 8, and the lower mold 32 engages with the outer periphery of the straight portion 4 of the ball stud 2, thereby supporting the small assembly pole joint 1a.

The press-fitting punch 33 has an injection hole 34 and a protrusion forming space 35 continuous with the injection hole 34 in the center. The protrusion forming space 35 has a truncated cone shape having a tapered surface that is continuous with the tapered surface of the through hole 18 of the closing plate 17 described above.

In FIG. 2, 25 is rubber filled in the gap between the housing 8 and the bearing 6.

Next, the manufacturing process of the Ni-ball joint 1 will be explained.

In the first step, the bearing 6 is placed over the ball head 5 of the ball stud 2.

In the second step, this ball stud 2 is inserted into the housing 8 through its large opening 9 side, so that the opening end surface 7 of the bearing 6 and the inner periphery 15 of the seven rungs of the housing 8 come into contact, and the ball The stud 2 is assembled into the housing 8 so that the handle 3 protrudes from the small opening 13 of the housing 8 to form a small assembled ball joint 1a.

In the third step, this sub-assembled ball joint la is set in the support mold 30, and in the fourth step, the closing plate 17 is press-fitted into the inner periphery of the caulking part 10 of the housing 8 using the press-fitting punch 33 (Fig. 1). . This press fit is performed on the inner surface 19 of the closing plate 17.
and the inner circumferential stepped portion 11 of the housing 8, leaving a distance L1.

In the fifth step, the compounded rubber is inserted into the housing 8 between 14 and 16 through the injection hole 34 of the press-fitting punch 33. Closing plate 170 through hole 1
8 and the protrusion forming space 35 of the press-fitting punch 33, and then vulcanization is performed (see FIG. 2).

In the sixth step, the rubber 25 is formed to extend from the inner peripheral stepped portion 11 of the housing 8 by L1 toward the side opposite to the ball stand.
The closing plate 17 is inserted into the housing 8 while compressing the excess wall portion 26 of the housing 8.
Press it further inside.

Immediately thereafter, in a seventh step, the caulking portion 10 is caulked inward to fix the closing plate 17 (left half in FIG. 2).

As described above, since the extra thickness 26 of the rubber 25 is compressed by the closing plate 17, a large preload is applied to the manufactured ball joint 1, and therefore stable torque can be maintained for a long period of time. The value of this torque is adjusted by adjusting the magnitude of the preload. That is, this can be done by adjusting the distance 4Ll between the inner surface 19 of the closing plate 17 and the inner step 11 of the housing 8 when the closing plate 17 is press-fitted into the caulking part 10 of the housing 8 in the fourth step. Therefore, by setting the distance L1 and the press-fitting load of the closing plate 17 in the sixth step in advance, ball joints can be mass-produced by easily keeping the torque value constant just by managing these.

Moreover, since the rubber 25 is interposed between the inner circumferential stepped portion 11 of the housing 8 and the inner circumferential surface 19 of the closing plate 17 to caulk the closing plate 17, the sealing performance of the caulking portion 10 can be improved. .

In this example! d: Since the rubber protrudes outward from the closing plate 17 in a wedge shape as a tapered protrusion 27,
This will prevent the closing plate 17 from coming off.

In the first embodiment of the present invention, compounded rubber is injected through the through hole in the closing plate, but as in the second embodiment described below, rubber is injected through the through hole in the cylindrical portion of the housing. You can.

FIG. 3 shows a method according to the second embodiment of the present invention, in which the sub-assembled ball joint 101a is placed in the support mold 130, and the inner circumferential surface 119 of the closing plate 117 and the inner circumferential stepped portion 111 of the housing 108 are aligned. This shows the state after the completion of the fourth step in which the closing plate 117 was press-fitted with a distance L2 left in between. The half-filled part of FIG. 4 shows the state after the fifth step, and the left half of FIG. 4 shows the state after the seventh step. The manufacturing steps in this example are almost the same as those in the first example except for the sixth step, so a detailed explanation will be omitted.

In the sixth step, injection of compounded rubber 1, housing 1
This is done through the through hole 120 formed in the cylindrical portion 112 of No. 08.

Therefore, an injection hole 184 is provided in the upper mold 131 of the support mold 130. Further, in order to encourage filling of the rubber 125, an escape through hole 12 is provided at a location approximately on the diameter of the through hole 120 of the housing 108, which allows the rubber 125 to escape.
1 is provided, and the upper die 131 is also provided with an escape hole 186 that is continuous with the escape through hole 121. Therefore, as shown in the left half of FIG.
A protrusion 127 is formed on the outer image. This protrusion 127 is
It may be removed after the seventh step.

〔effect〕

As described above, in the present invention, when press-fitting the closing plate in the fourth step, the distance Ll (L
By changing 2), the amount of preload applied to the pole joint can be adjusted, making it easy to set the torque value of the ball joint that has an anti-vibration effect and to manufacture it efficiently. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a small assembled ball joint set in a support mold in the first embodiment of the present invention;
The half part of Fig. 2 is a sectional view of the ball joint after being filled with rubber, the left half of Fig. 2 is a sectional view of the ball joint after caulking, and Figs. A sectional view showing the same state as FIGS. 1 and 2 of the second embodiment, and FIGS. 5 and 6 are sectional views of a conventional ball joint. (Explanation of symbols) 1a...Small ball joint. 2...Ball stud. 5...Ball head. 6...Bearing. 8...Housing. 9...Large opening. 10......The closing part. 11... Inner circumferential step section. 12...Cylindrical part. 16...Gap. 17...
・Closing plate. 30...Support type. Figure 1

Claims (1)

[Claims] A cup-shaped gap 1 is formed between the inner peripheral surface of the cylindrical housing 8 and the inner peripheral surface of the cylindrical housing 8.
A synthetic resin bearing 6 of a size that forms a first
In a step, the ball head 5 of the ball stud 2 is covered, in a second step, the ball stud 2 is assembled into the housing 8 to form a sub-assembled ball joint 1a, and in a third step, the sub-assembled ball joint 1a is assembled into a support type. 30, an annular caulking part 10 formed on the edge of the large opening 9 of the housing 8 in a fourth step is formed on the inner periphery of the annular caulking part 10 in a continuous manner with the caulking part 10 on the cylindrical part 12 of the housing 8. The closing plate 17 is press-fitted leaving a distance L1 between it and the inner circumferential stepped portion 11,
Thereafter, in a fifth step, compounded rubber is filled into the gap 16 through the injection hole 34 at a proper location and then vulcanized, and in a sixth step, the closing plate 1
7 into the housing 8, and in a seventh step, the caulking portion 10 of the housing 8 is caulked to fix the closing plate 17.