JPS636205A - Link and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The invention relates to a link that is rotatably connected to another member, such as an upper arm or a lower arm in an automobile suspension system, and a method for manufacturing the link. .

(Prior Art) In an automobile suspension system, a link such as an upper arm or a lower arm that connects a BL body and a wheel knuckle mechanism includes an arm body and a pivot provided at one end of the arm. As a means for forming the part, 1, for example, JP-A No. 5
Like the one described in Publication No. 9-2432915,
It was common to attach a cylindrical body to one end of the arm body by bath welding. According to the invention, the fixation of the cylindrical body is performed by caulking, but in general, as a means for caulking the cylindrical body to the plate, a stepped portion is formed on the cylindrical body. A plate body is fitted to the large diameter part and the stepped part is pressed and caulked (Japanese Patent Application Laid-Open No. 54-5859), and a concave groove is formed on the circular surface of the cylindrical body to make it easy to bulge out. Things (JP-A-54-9646
No. 4) etc. are known.

(Problems to be Solved by the Invention) In the prior art described above, in which the cylinder is fixed by welding, rust occurs in the bath contact part due to heating during welding, and subsequent rust prevention treatment is difficult. .

In addition, those in which the cylindrical body is fixed by caulking require a pretreatment process to provide a step or a groove in the cylindrical body.In addition, the cylindrical body is formed into a bellows shape, and the bellows-shaped part is a bead of nitrogen. Because of this, it has elasticity, and there is a problem that it is difficult to caulk firmly.

(Means for Solving the Problems) The present invention has developed a link that firmly fixes a cylindrical body by caulking without using welding means that causes rust, and a method for manufacturing the link. A concentric mounting hole is provided at one end of the arm body, which has a U-shaped cross section and consists of flanges on both sides of the web, passing through both flanges. The feature is that a caulking part is formed in contact with the outer surface of the bead and both flanges, and the cylinder body is fixed to the flange by the bead and the caulking.As for its manufacturing method, a U-shaped cross section consisting of a web and flanges on both sides of the web is used. A concentric mounting hole is provided at one end of the shaped arm body that passes through both flanges, and a cylinder is fitted into the mounting hole, forming a split inner periphery with narrow enlarged diameter holes at both ends of the inner periphery. grip the outer peripheral surface of the cylinder between the two flanges, press the inner surface of the cylinder with a mandrel, press the outer peripheral surface of the cylinder with a mold at a position outside the flanges, and press both ends of the cylinder in the axial direction. A part of the cylindrical body is press-fitted into the enlarged diameter portion to form a solid bead, first, both ends of the cylindrical body are caulked, and each flange is held by this caulked portion and the bead. shall be.

(Function) In the uninvented link, the two flanges of the main arm are sandwiched and fixed by the solid bead of the cylinder and the caulked part, so a strong fixed part is formed that will not loosen. It can have the same effect as an integrally formed link. Also.

In the manufacturing method of the present invention, the inside of the flange of the arm body is pressurized in the axial direction of the cylinder. If m is part of the mold, a solid bead is formed.

The bead is in close contact with the inner surface of the flange, and by caulking both ends of the arrow barrel, the flange is held between the bead and the caulked portion to form a strong joint.

(Example) Among the drawings, FIG. 1 shows a first example of the link of the present invention, and this link (11 is used as a lower arm in a suspension system of an automobile, and the arm book 1X (2)
, a cylindrical body (3) pivotally attached to the vehicle body, and a ball job vent mounting seat (4).

As shown in Figures 2 and 3, the arm body (2) has a U-shaped cross section consisting of a web (5) and flanges (6). ) *
(6) Shorter tube green f7) due to zearing process,
(7) and mounting holes (81, (8)) are formed.

The cylindrical body (3) is provided with protruding beads Ql) and QQ on the curved surface of the flange (6), which are in contact with the inner surface of the flange (6).
1. Fix the cylinder (3) to the arm body (2) by clamping the tube (7) (7) with (111).

The cylindrical body (3) has a bead QO, 00 or a caulked part an,
Although it is possible to secure the arm body to the arm body using only either one of the aυ, in the present invention, both of these means are used, and since the bead is made solid, it does not bend under the load in the axial direction and forms a reliable securing part. Even after long-term use with vibrations, the staking will not come loose. Therefore, even if a thin-walled tube and arm body are used as link materials, the joint between the arm body and the tube can be made strong, which also contributes to reducing the weight of the vehicle.

Next, the means for forming this joint portion will be explained with reference to FIGS. 4 to 6.

First, as shown in Figure 4, flange (6), (6
) in the mounting holes (8) and (8) of the simple cylindrical body (
3), and press the outer peripheral surface of the cylinder (3) with the split molds ■ and @ between the flanges 1ft) and (6). This split chain has a narrow diameter at both ends of the inner circumference! 'is
of, (to) and @.

(to) is formed, one annular space is formed by the enlarged diameter portions (2) and (2), and another annular space is formed by @ and @.

Next, as shown in Fig. 5, split molds (1), @, (2) are made.

Hold down the exposed parts of the pipes (7), (7) and the cylinder (3) with a rice pad.

Insert a flame into the no-seven-inch with the core metal (b) and (end) to pressurize both ends of the cylinder (3). By this pressurization,
The portion of the cylinder body (3) in contact with the enlarged diameter part of the split mold, (to), @, and (a) is within the annular space defined by the enlarged diameter part and the flanges (6), (6). It is extruded to form a solid bead head, QG, which extends outward as shown in Figure 6.

Therefore, the inner surface of flange (6) + (6) is
A part of the bead mold is lightly acidified. Next, beat the split mold (
As shown in Fig. 7, remove the punch trowel and punch trowel, and use the split molds (3Ua) to (33a) as guides to swage the end face with the end crimping punch and 2, and then swage the crimped part α. , αυ are formed and the beads (IQ, OO) cooperate to fix the cylinder (3) to the flanges (6), (6).

The above-mentioned punch (B), (7) has a mandrel (7) and a bottom integrally provided, but the inner diameter of the cylinder (3) is attached to one or both of the punch (b) and (7). It is possible to provide equal openings and use a mandrel that passes through these openings and the cylinder (3), and in this way it is possible to prevent unexpected deformation of the middle part of the cylinder (3). .

Next, the 25th link of the present invention! An example and its manufacturing method will be described.

A part of this link is shown by the symbol (G) in FIG. There is no equivalent to 8). A bead 1 is formed on the cylindrical body in the same manner as in the first embodiment, and a flange is formed by the bead 2 (b) and the caulked part) and @9.

(6) is fixed directly. Since this fixed portion does not have the tube wire (7) as in the first embodiment, its resistance to the vibration of the cylinder body is weaker than in the first embodiment.

Since the flange (6) (6) is supported by a solid bead, a strong joint can be obtained even if only the outer peripheral part (43a) of the end of the cylinder (roller) is caulked to the part (2). Can be done.

The processing order of this example is as shown in FIG.
Press the cylinder with the punch (54) with the mandrel (55).
Press both end faces of the bead to extrude it. This process is.

The only difference from the process shown in FIG. 6 is that the shapes of the inner peripheral surfaces of the split molds (52) and (53) do not have a portion corresponding to the tube line (7). Next, hold the mandrel (57) and tighten the outer periphery of both ends of the cylindrical body (43a) using a punch (56) for tightening.
caulk to form ) on the caulked part.

The structure of the caulking portions at both ends can adopt the structure of the caulking portion αυ in the first embodiment in addition to the structure of the caulking capital ■, and in this case, the punch shown in FIG. 7 is used. .

(Effects of the Invention) The link of the present invention has the advantage that when caulking the cylinder to the arm body,
Since the bead is formed using the flange of the arm body as part of the mold, the bead attaches to the inner surface of the flange to form a support part with no play, and the bead has a solid structure with no internal gap. Therefore, it does not undergo elastic deformation, and therefore the rudder does not become loose. Therefore, in this link, the cylindrical body is fixed with two sets of fixing means, the bead and the caulking part, and since it uses a fixing means that does not easily loosen, it is possible to obtain an extremely strong and reliable joint. . Therefore, it is possible to use a thin arm body and cylinder body, which is effective in reducing weight.

In addition, according to the uninvented manufacturing method, narrow enlarged diameter parts are provided at both ends of the inner circumference of the split die that grips the outer circumferential surface of the cylinder, so that the cylinder does not bend into a bellows shape and has a round bead. It is easily formed and the cylindrical body can be securely caulked to the arm body.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a first embodiment of the inventive link, Fig. 2 is a side view of the arm body used in the link of Fig. 1;
Figure 3 is a sectional view taken along line III-In in Figure 2, Figures 4, 5, 6, and 7 are sectional views showing the manufacturing process of the link in Figure 1, and Figure 8 is a cross-sectional view of the link shown in Figure 1. FIGS. 9 and 10 are cross-sectional views showing the manufacturing process of the link shown in FIG. 8. FIGS. (2)...Arm body (3), Kl...
Cylinder QQ, Bead αD, -...
Caulking part ■, 21), ω, (51)...Split mold tool, field 1124+(A)...Expanded diameter part Patent applicant Press Giken Kogyo Co., Ltd. Figure 4 Figure 6 Figure 3

Claims (1)

[Claims] 1. A concentric mounting hole passing through both flanges is provided at one end of the arm main body, which has a U-shaped cross section and is composed of a web and flanges on both sides of the web. A link characterized in that a solid bead in contact with the inner surface of the flange and a caulked portion in contact with the outer surfaces of both flanges are formed, and a cylindrical body is fixed to the flange by the bead and the caulked portion. 2. At one end of the arm main body, which has a U-shaped cross section and consists of the web and the flanges on both sides of the web, a concentric mounting hole is provided that passes through both flanges. A cylinder is fitted into the mounting hole, and a width gripping the outer peripheral surface of the cylindrical body between the two flanges with the inner peripheral part of the split mold forming a narrow enlarged diameter part, and pressing the inner surface of the cylindrical body with a mandrel;
Pressing the outer circumferential surface of the cylindrical body with a mold at a position outside of both flanges, pressurizing both ends of the cylindrical body in the axial direction, and press-fitting a part of the cylindrical body into the enlarged diameter portion to form a solid bead; A method of manufacturing a link, which comprises: next caulking both ends of the cylindrical body, and holding each flange by the caulked portions and the beads.