JP2001097014A - Member for arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for an arm high in bending rigidity at a bent part of a member body which is provided with a bent part in an intermediate part in the axial direction, and provided with a fitting hole to fit a joint member at the bent part of the bar-like member body bent in a substantially V-shape or substantially U-shape in the axial direction in one plane around the bent part. SOLUTION: The member body 101 has a hollow part 102 extended in the axial direction of extrusion, and manufactured of an aluminum extruded material with its axial direction of extrusion being the axial direction of the member body. Plastic working is achieved at the bent part 103 of the member body to increase the moment of inertia with respect to the neutral axis Z of the section of the bent part 103 in the bending in the plane including the member body 101. The fitting hole 104 is provided in the bent part 103.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arm member used as a suspension arm, an engine mound, a frame and the like of a vehicle such as an automobile.
The present invention relates to an arm member having a mounting hole in which a joint member (for example, a bush or a ball joint) connected to another member is mounted.

[0002]

2. Description of the Related Art Arm members used as, for example, suspension arms for automobiles have various shapes. One of the members has a bent portion at an intermediate portion in the axial direction, and one plane is formed around the bent portion. In the axial direction approximately V
2. Description of the Related Art There is known a rod-shaped member main body bent in a U-shape or a substantially U-shape in which mounting holes for mounting a joint member are provided at bent portions and both end portions, respectively.

[0003] In this arm member, the main reason for the bending of the member main body is to avoid interference with other members at the mounting location.

The arm member is used by being connected to another member via a joint member mounted in each mounting hole.

[0005]

However, in this arm member, the main body of the arm is substantially V-shaped or substantially U-shaped in the axial direction.
Since it is bent in a letter shape, it has the following drawbacks. That is, when a load is applied to the joint member in a state where the arm member is connected to another member, a bending moment acts on the member main body, and the bending load is concentrated on the bent portion of the member main body. Attempts to bend at the bend in the plane containing the member body. When the member main body is bent and deformed at the bent portion in this manner, the shape of the mounting hole provided in the bent portion is distorted, and the joint member may fall out of the mounting hole. For this reason, in this arm member, it is necessary to increase the bending moment in the bent portion of the member body by increasing the second moment of area of the bent portion of the member body.

On the other hand, by increasing the thickness of the bent portion, the second moment of area of the bent portion can be increased. However, this causes a problem of increasing the weight of the arm member. .

The present invention has been made in view of such a technical background, and has an object to have a bent portion at an intermediate portion in the axial direction and to have a substantially V-shaped portion around the bent portion in one plane in the axial direction. An arm member provided with a mounting hole for mounting a joint member at least at a bent portion of a rod-shaped member main body bent into a U-shape or a substantially U-shape, wherein the bending rigidity at the bent portion of the member main body is increased. Accordingly, it is an object of the present invention to provide a lightweight arm member capable of preventing deformation of a mounting hole provided in a bent portion and firmly holding a joint member mounted in the mounting hole.

[0008]

In order to achieve the above object, a first aspect of the present invention has a bent portion at an intermediate portion in the axial direction, and has a substantially V-shape in one plane around the bent portion in one plane. An arm member provided with a mounting hole for mounting a joint member at least at the bent portion of a rod-shaped member main body bent into a U-shape or a substantially U-shape. It is manufactured from an extruded material oriented in the axial direction, and the bent portion of the member main body has a plastic deformation for increasing a second moment of area about a neutral axis of a cross section of the bent portion in bending deformation in the plane. Processing is performed, and a mounting hole is provided in the bent portion.

According to this, since the member main body is manufactured from the extruded material whose extrusion axial direction is set to the axial direction of the member main body, the member main body can be obtained efficiently and cost-effectively. The manufacturing cost of the arm member is reduced.

[0010] The bent portion of the member main body is subjected to a plastic deformation process for increasing a second moment of area with respect to a neutral axis of a cross section of the bent portion in the bending deformation in the plane, so that the member main body is deformed. The bending stiffness at the bent portion becomes higher. Furthermore, since the bending portion is hardened by the work hardening accompanying the plastic deformation processing, the bending rigidity at the bending portion of the member main body also increases in this regard. As a result,
It becomes difficult for the member body to bend at the bent portion, so that the shape of the mounting hole provided in the bent portion is maintained, and the joint member mounted in the mounting hole is firmly held.

A second aspect of the present invention is that, in the first aspect of the present invention, the extruded material has a hollow portion extending in the extrusion axis direction.

According to this, the weight of the arm member is reduced.

According to a third aspect of the present invention, in the first aspect of the present invention, the extruded material has a hollow portion extending in the direction of the extrusion axis, and the bent portion of the member main body is That is, it is deformed into a substantially flat shape in the plane by plastic deformation.

According to this, since the extruded material has the hollow portion extending in the extrusion axis direction, the weight of the arm member is reduced.

Further, since the bent portion of the member body is deformed into a substantially flat shape in the plane, the bent portion expands in the plane, so that when setting the hole diameter of the mounting hole,
It is possible to set the diameter of the mounting hole larger than the outer diameter of the member main body.

According to a fourth aspect of the present invention, in the first aspect of the invention, the extruded material has a hollow portion extending in the extrusion axis direction and has a substantially elliptical or substantially rectangular cross-sectional shape. The member body is bent so that a direction along a long axis or a long side of a cross section thereof is orthogonal to the plane, and a bent portion of the member body is formed by the plastic deformation processing. , In the plane being substantially flattened.

According to this, since the extruded material has the hollow portion extending in the extrusion axis direction, the weight of the arm member is reduced.

Further, the member body is bent so that the direction along the long axis or the long side of the cross section thereof is perpendicular to the plane, so that the member body can be easily bent. Become. Furthermore, the bent portion of the member body is
By being deformed into a substantially flat shape in the plane, the amount of expansion of the bent portion due to plastic deformation processing is further increased, so that when setting the hole diameter of the mounting hole, the hole diameter of the mounting hole is set to be even larger. Will be possible.

According to a fifth aspect of the present invention, in the first aspect of the invention, the extruded material has a hollow portion extending in the direction of the extrusion axis, and the extruded member has a hollow portion in the bent portion of the member main body. , The core is fitted, and the bent portion of the member main body is deformed into a substantially flat shape in the plane by the plastic deformation processing.

According to this, since the extruded material has the hollow portion extending in the extrusion axis direction, the weight of the arm member is reduced.

Further, since the core is inserted into the hollow portion of the bent portion of the member body, the bending rigidity at the bent portion of the member body is increased by the amount of the core. further,
The thickness of the bent portion of the member body deformed into a substantially flat shape becomes large by the thickness of the core, and therefore, in a state where the joint member is mounted in the mounting hole, the circumference of the joint member and the mounting hole is reduced. The contact area with the surface is increased, and the stability of the joint member in the mounting hole is improved. Furthermore, the amount of deformation of the bent portion of the member main body due to the plastic deformation processing is reduced by the thickness of the core, and cracks due to plastic deformation that may occur on both side edges of the bent portion are prevented.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the core is cylindrical, and the inside of the bent portion of the member main body has one axial direction of the core. The part is deformed substantially flat in the plane along with the bent part of the member main body by the plastic deformation processing.

According to this, a part of the core in the axial direction is
By being deformed into a substantially flat shape in the plane together with the bent portion of the member main body, the movement of the core along the axial direction of the member main body is restricted in the hollow portion of the member main body, and the core is It is fixedly inserted into the hollow portion of the bent portion. As a result, the joint member mounted in the mounting hole is securely held.

Here, in this arm member, as the plastic deformation process, various processes for plastically deforming the bent portion of the member body are listed. For example, the bent portion is plastically deformed by pressing the bent portion with a press ram. Pressing is shown.
In addition, as a joint member mounted in the mounting hole, for example, a bush and a ball joint correspond.

[0025]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 7 show an arm member according to a first embodiment of the present invention and a manufacturing procedure thereof.

In FIG. 1, reference numeral (100) denotes an arm member according to the first embodiment. This arm member (100)
This is used as a front upper arm in a suspension arm of an automobile, and is a so-called A-type arm that is connected to other members at three places.

Numeral (120) denotes a cylindrical ball joint as a joint member.
Comprises a shaft rod portion (120a) having a spherical portion formed at an end, and a columnar receiving portion (120b) having a holding recess rotatably holding the spherical portion of the shaft rod portion (120a). are doing.

(121) and (121) are cylindrical anti-vibration bushes also serving as joint members.
Has a rubber elastic portion, and a shaft hole (121a) is provided in the center of the bush (121).

The arm member (100) is formed in the axial direction of a rod-shaped member body (101) having a predetermined length.
The ball joint (120) and bush (1
21) Circular mounting holes (104) (10) for mounting (121)
5) (106) is provided.

The member main body (101) is manufactured from a rod-shaped aluminum (including its alloy, hereinafter the same) extruded material whose extrusion axis direction is set to the axis direction of the member main body (100). As shown in FIGS. 5 (a) and 5 (b), this extruded material has a tubular shape having a hollow portion (102) extending in the extrusion axis direction, and has a substantially elliptical cross-sectional shape. And has a substantially uniform thickness in the circumferential direction. The member main body (101) is manufactured from such an extruded material.

Further, as shown in FIG. 1, the member main body (101) has a substantially arc-shaped bent portion (103) at an intermediate portion in the axial direction thereof. Are bent in a substantially U-shape in the axial direction in one plane. In this bent state, the direction along the major axis of the cross section of the member main body (101) is orthogonal to the plane including the member main body (101). In this manner, the member body (10
1) is bent, that is, the member main body (101) is bent in the direction in which it is most likely to bend. Therefore, when performing bending processing for bending the member main body (101), such bending processing is easily performed. Is what you can do.

Further, in the member main body (101), the bent portion (103) is subjected to plastic deformation processing, so that the peripheral wall portion of the bent portion (103) is joined to the member main body (10).
It is plastically deformed in a substantially flat shape in the plane including 1). Accordingly, in the member main body (101), as shown in FIG. 7B, bending deformation in a plane including the member main body (101) (that is, the member main body (101) deforms the member main body (101)). The second moment of area about the neutral axis (z) of the cross section of the bent portion (103) in the bent portion (103) in the plane including the deformed portion (see FIG. 6 and FIG. 7A) Is bigger than.
In this state, the hollow portion (102) in the bent portion (103) of the member main body (101) is substantially eliminated as shown in FIG. 7 (b).

The bent portion (1) of the member body (101)
03), a circular mounting hole (104) for mounting the ball joint (120) is formed in a direction perpendicular to a plane including the member main body (101) (ie, in a bent portion (103) deformed into a substantially flat shape). (Thickness direction). This mounting hole (10
4) has a hole diameter slightly smaller than the diameter of the ball joint (120), so that the ball joint (120) can be mounted in the mounting hole (104) by press-fitting. .

When setting the diameter of the mounting hole (104), the bent portion (103) of the member body (101) is deformed to be substantially flat, so that the diameter of the mounting hole (104) is reduced. Can be set larger than the outer diameter of the member body (101). In addition, since the member main body (101) is bent so that the direction along the major axis of the cross section is perpendicular to the plane including the member main body (101), the bent portion (103) associated with the plastic deformation processing is formed. The spread amount is large. Therefore, the mounting holes (1
04) The hole diameter can be set even larger.

On the other hand, one end of the main body (101) has a circular mounting hole (10) for mounting the bush (121).
5) is penetrated in a direction parallel to the plane including the member main body (101) and perpendicular to the axial direction of the one end. Similarly, a circular mounting hole (106) for mounting the bush (121) is provided at the other end of the member main body (101) in parallel with a plane including the member main body (101). It is pierced in a direction perpendicular to the axial direction. These two mounting holes (105) and (106) have a slightly smaller hole diameter than the outer diameter of the bushes (121) and (121). The bushes (121) and (121) can be mounted by press fitting.

Thus, the mounting holes (10
5) When setting the hole diameter in (106), the member body (101)
As described above, since the direction along the long axis of the cross section is bent so as to be orthogonal to the plane including the member main body (101), the diameters of the mounting holes (105) and (106) are increased. Can be set.

The arm member (100) having the above structure is manufactured as follows.

First, as shown in FIG. 5 (a), a straight rod-shaped member body (101) made of extruded aluminum is used, and this is bent in a plane at an intermediate portion in the axial direction by a known bending process. To bend substantially U-shaped. The member body (101) thus obtained is shown in FIG. FIG. 7A shows a cross section of the bent portion (103) of the member main body (101). The cross-sectional shape of the bent portion (103) of the member main body (101) is substantially the same as the cross-sectional shape of the member main body (101) shown in FIG.

Next, the bent portion (1) of the member body (101)
03), the peripheral wall of the bent portion (103) is plastically deformed in a substantially flat shape in a plane including the member body (101). In the first embodiment, as the plastic deformation processing, a bent portion (10) is formed by a press ram (not shown).
The press working of 3) in which the peripheral wall portion is pressed from the outer peripheral surface thereof and is plastically deformed into a substantially flat shape is used.

Next, a mounting hole (104) for mounting the ball joint (120) is formed in the bent portion (103) by a known hole forming process such as press punching or machining by machining. At each end of the member body (101), a mounting hole (105) (10) for mounting a bush (121) is provided.
6) is pierced by a known perforation process such as press punching and machining by machining. Thus, the desired arm member (100) shown in FIGS. 1 and 2 is finally obtained.

The arm member (100) thus obtained.
Is used as follows. That is, as shown in FIGS. 3 and 4, the ball joint (120) is press-fitted into the mounting hole (104) provided in the bent portion (103) of the member body (101), and the member body ( Bushes (121) and (121) are mounted by press-fitting into mounting holes (105) and (106) provided at both ends of 101). The arm member (100) is connected to another member (not shown) via a ball joint (120) and bushes (121) and (121).
Used in conjunction with

In this arm member (100), the member main body (101) is manufactured from an extruded material whose extruding axis is set to the axial direction of the member main body (101). There is an advantage that the main body (101) can be obtained efficiently and cost-effectively.

The arm member (100) is lightweight because the member body (101) is made of an extruded material having a hollow portion (102) extending in the extrusion axis direction. Has advantages. In addition, the arm member (100) is extremely lightweight because the member main body (101) is made of extruded aluminum.

Further, in the arm member (100), the bent portion (103) of the member main body (101) is formed by the member main body (10).
The second moment of area about the neutral axis (z) of the cross section of the bent portion (103) in the bending deformation in the plane including the member main body (101) by being deformed into a substantially flat shape in the plane including (1). Is increased, resistance to bending deformation in a plane including the member main body (101) is increased. Therefore, this arm member (100)
This prevents a problem that the shape of the mounting hole (104) provided in the bent portion (103) of the member main body (101) is distorted even when a load is applied to the bush (121) (121). Therefore, there is an advantage that the ball joint (120) mounted in the mounting hole (104) can be held firmly. Further, since the arm member (100) has only a substantially flat deformed portion (103) of the member main body (101), the arm member (100) has no weight increase due to an increase in the second moment of area, and is lightweight. Is kept in good condition.

Further, since the hollow portion (102) in the bent portion (103) of the member body (101) is substantially eliminated, if the bent portion (103) of the member body (101) is temporarily By hitting the interference member of
Even when a force is applied to the outer peripheral surface of 3), the bent portion (103) is depressed and the shape of the mounting hole (104) is distorted, so that the ball joint (120) is removed from the inside of the mounting hole (104). No problem such as dropping occurs.

FIGS. 8 to 15 show an arm member according to a second embodiment of the present invention and a manufacturing procedure thereof. In these drawings, the same or similar components as those of the arm member (100) of the first embodiment are denoted by reference numerals obtained by adding 100. Hereinafter, the arm member (200) of the second embodiment will be described focusing on differences from the arm member (200) of the first embodiment.

The arm member (200) of the second embodiment.
As shown in FIG. 8, like the arm member (100) of the first embodiment, is used as a front upper arm in a suspension arm of an automobile, and is called a so-called A-type arm. Things.

In the arm member (200), the member main body (201) is made of an extruded aluminum material having the following configuration. That is, as shown in FIGS. 12 (a) to 12 (c), the extruded material has a tubular shape having a hollow portion (202) extending in the extrusion axis direction.
It has a circular cross-sectional shape and a uniform thickness in the circumferential direction. The member body (20
1) has been produced.

As shown in FIG. 8, the member main body (201) is the arm member (100) of the first embodiment.
As in the case of the member body (101), a substantially arc-shaped bent portion is provided at an intermediate portion in the axial direction of the member main body (101).
It is bent in a substantially U-shape in the axial direction within one plane centering on 3).

Further, the bent part (2) of the member body (201)
By performing plastic deformation processing on 03), the peripheral wall portion of the bent portion (203) is plastically deformed in a substantially flat shape in a plane including the member main body (201). The above-described press working is used as the plastic deformation working. Further, in the hollow portion (202) of the bent portion (203), a cylindrical first core (210) made of an extruded aluminum material for reinforcing the bent portion (203) is provided. (210)
The peripheral wall portion of the intermediate portion in the axial direction is fitted together with the peripheral wall portion of the bent portion (203) of the member main body (201) in a state where the peripheral wall is plastically deformed in a substantially flat shape in a plane including the member main body (201). I have. The first core (210) has a circular cross-sectional shape as shown in FIG. The first core (210) has a uniform thickness in the circumferential direction.

In the arm member (200), as shown in FIG. 15 (b), the first core (210) is formed in the hollow portion (202) of the bent portion (203) of the member body (201). In the state in which the hollow portion (202) in the bent portion (203) of the member main body (201) and the hollow portion in the axially intermediate portion of the first core (210) are both fitted by the plastic deformation processing, It has almost disappeared.

Then, the bent portion (2) of the member body (201)
03) includes a ball joint (22) as shown in FIG.
A circular mounting hole (204) for mounting 0) is formed through a hole perpendicular to a plane including the member main body (201) by a punching process such as press punching.

On the other hand, at one end of the member body (201),
By being subjected to plastic deformation such as pressing,
The peripheral wall of the one end is plastically deformed in a substantially flat shape in a plane orthogonal to a plane including the member main body (201). Further, a cylindrical second core (211) made of an extruded aluminum material is provided in a hollow portion (202) at one end of the member main body (201) at one end of the second core (211). The peripheral wall portion is fitted together with the peripheral wall portion at one end of the member main body (201) in a state where the peripheral wall portion is plastically deformed in a substantially flat shape in a plane orthogonal to a plane including the member main body (201). Similarly, by subjecting the other end of the member main body (201) to plastic deformation such as press working, the peripheral wall of the other end is orthogonal to the plane including the member main body (201). The inside is plastically deformed in a substantially flat shape. Further, a hollow portion (20) at the other end of the member body (201) is provided.
In 2), a cylindrical third core (212) made of an extruded aluminum material has a peripheral wall at one end of the third core (212) and a peripheral wall at the other end of the member body (201). With the member body (201)
In a plane orthogonal to the plane including the above-mentioned, in a state of being substantially flatly plastically deformed. The second and third cores (211) and (212) are both the first core (210).
It is the same shape and size as. Then, in a state where the second and third cores (211) and (212) are fitted into the hollow portions (202) at the respective ends of the member main body (201), the respective ends of the member main body (201) are The hollow portion (202) and the hollow portion at one end of each core (211) (212) are substantially eliminated.

At both ends of the member main body (201), circular mounting holes (205) and (206) for mounting the bushes (221) and (221) are parallel to a plane including the member main body (201). The direction perpendicular to the axial direction of the end (that is, the member body (20
1) in the thickness direction of each end).

The mounting hole (20) for mounting the bush
5) At the time of setting the hole diameter of (206), since each end of the member main body (201) is deformed to be substantially flat, the hole diameter of these mounting holes (205) and (206) is It can be set larger than the outer diameter.

The arm member (200) having the above structure is manufactured as follows.

That is, as shown in FIG. 12A, the straight rod-shaped member body (20) made of the extruded aluminum material is used.
Using 1), the first core (210) is fitted into the hollow portion (202) at the axially intermediate portion of the member body (201), and the hollow portions (2) at both ends of the member body (201) are inserted.
02), the second and third cores (211) and (212) are fitted. In this state, each of the cores (210), (211), and (212) is fitted exactly into the hollow portion (202) of the member main body (201). The member body (201) may be caulked so that the cores (210), (211), and (212) fitted in the hollow portion (202) of the member body (201) do not shift.

Next, as shown in FIG. 13, the member main body (201) is bent in a substantially U-shape in one plane by a known bending process at an intermediate portion in the axial direction. FIG. 14 shows the member main body (201) thus obtained. FIG. 15A shows a cross section of the bent portion (203) of the member main body (201). The cross-sectional shape of the bent portion (203) of the member main body (201) is substantially the same as the cross-sectional shape of the member main body (201) shown in FIG.

Next, the bent portion (2
03), the peripheral wall of the bent portion (203) is formed along with the peripheral wall of the intermediate portion in the axial direction of the first core (210) in a plane including the member main body (201). Plastically deform into a flat shape. And, in this bent part (203),
A mounting hole (204) for mounting the ball joint (220) is formed. Further, plastic deformation processing is performed on both ends of the member main body (201), and the peripheral wall portions at the both ends are formed in the second and third portions.
The core (211) and the peripheral wall at one end of the core (212) are plastically deformed in a plane perpendicular to a plane including the member main body (201). At both ends of the member main body (201), mounting holes (205) and (206) for mounting the bush (221) are formed, whereby a desired arm member (FIG. 8 and FIG. 9) is formed. 200) is obtained.

The arm member (200) thus obtained
Are used in the same manner as in the first embodiment. Ball joint (220) and bush (221) (22
FIGS. 10 and 11 show the arm member (200) to which 1) is attached.

In this arm member (200), since the member main body (201) is made of an extruded aluminum material having a hollow portion (202) extending in the direction of the extrusion axis, it is extremely high. In addition to having the advantage of being lightweight, the bent part (203) of the member main body (201) is deformed into a substantially flat shape in a plane including the member main body (201), thereby including the member main body (201). Neutral axis (z) of the cross section of the bent portion (203) in bending deformation in a plane
Since the second moment of area is increased, resistance to bending deformation in a plane including the member main body (201) is increased. In addition, in the hollow part (202) in the bent part (203) of the member main body (201), the first core (21)
0), the peripheral wall of the intermediate portion in the axial direction is the member body (20).
The main body of the member (201) together with the peripheral wall of the bent portion (203) of 1)
Are inserted in a state of being deformed into a substantially flat shape in a plane including the above, the second moment of area about the neutral axis (z) is further increased, so that the member body (201)
The resistance to the bending deformation in the plane including is extremely large. Therefore, this arm member (200)
The problem is that even when a load is applied to the bushes (221) and (221), the shape of the mounting hole (204) provided in the bent portion (203) of the member body (201) is distorted. This has the advantage that the ball joint (220) mounted in the mounting hole (204) can be more securely held.

Further, the arm member (200) is provided with a core (21) only in a part of the hollow portion (202) of the member main body (201).
0) Since (211) and (212) are fitted, the increase in weight due to the increase in the second moment of area is suppressed as much as possible.
It is kept lightweight.

Further, in the arm member (200), the first core (210) is fitted into the hollow portion (202) of the bent portion (203) of the member body (201).
The thickness of the bent portion (203) of the member body (201) is as large as the thickness of the first core (210), so that the ball joint (220) is located in the mounting hole (204). When mounted, the ball joint (220) and mounting hole (204)
Since the contact area with the peripheral surface of the ball joint is increased, there is an advantage that the ball joint (220) can be stably and firmly held.

In addition, in the arm member (200), the amount of deformation of the bent portion (203) of the member main body due to plastic deformation is reduced by the thickness of the first core (210).
Cracks due to plastic deformation that may occur on both side edges of the bent portion (203) are prevented, and thus the arm member (200) has excellent strength reliability.

The first core (210) fitted in the hollow part (202) of the bent part (203) of the member body (201).
Since only the intermediate portion in the axial direction is deformed into a substantially flat shape, the movement of the first core (210) along the axial direction of the member main body is restricted, and the bent portion (203) of the member main body (201) is restricted. Since it is fixed so as not to move in the hollow portion (202), there is an advantage that the ball joint (220) mounted in the mounting hole (204) can be more stably and firmly held. Furthermore, after the first core (210) is inserted into the hollow portion (202) of the bent portion (203) of the member main body (201), the bent portion (203) is subjected to plastic deformation processing only. Since the first core (210) can be fixed, the first core (210) can be fixed by a simple operation, and there is an advantage that the manufacturing cost is reduced.

In the fifth aspect of the present invention, the first core (210) inserted into the hollow portion (202) of the bent portion (203) of the member main body (201) has a plate shape (see FIG. (Not shown).

FIGS. 16 to 19 show an arm member according to a third embodiment of the present invention and a manufacturing procedure thereof. In these figures, the arm member (100) of the first embodiment is shown.
Components that are the same as or similar to the above components are denoted by reference numerals obtained by adding 200. Hereinafter, the arm member (300) of the third embodiment will be described focusing on points different from those of the first embodiment.

The arm member (300) of the third embodiment.
Is used as a rear upper arm in a suspension arm of an automobile.

In the arm member (300), the member main body (301) is manufactured from an extruded aluminum material having the following configuration. That is, as shown in FIGS. 17A and 17B, the extruded material has a plate-like shape having a constant width, and is provided at an intermediate portion in the width direction on the outer surface on both sides in the thickness direction. The first wide ridges (301a) (301a) extending in the width direction are formed, and the second narrow ridges extending in the extrusion axis direction are formed at both ends in the width direction on the outer surface portions on both sides in the thickness direction. (301b) (301b) (301b) (30
1b) is formed.

The main body (301) of FIG.
As shown in the figure, a substantially arc-shaped bent portion (303) is provided at an intermediate portion in the axial direction, and is bent in a substantially V-shape in the axial direction in one plane around the bent portion (303). Is what it is. In this bent state, the thickness direction of the cross section of the member main body (301) is orthogonal to the plane including the member main body (301).

Further, the bent portion (3
03) is subjected to the plastic deformation such as the press working described above, whereby the bent portion (303) is plastically deformed in a substantially flat shape in a plane including the member body (201). As shown in FIG. 19B, the bent portion (30
In 3), the first ridges (301a) and the second ridges (301b) are substantially eliminated, and the bent portions (303) are flat. Therefore, in this member body (301), the member body (3
01) in the bending deformation in the plane including (30)
The second moment of area with respect to the neutral axis (z) of the section 3) is larger than that before deformation (see FIGS. 18 and 19A).

Then, the bent portion (3) of the member body (301)
On 03), a circular mounting hole (304) for mounting the ball joint (320) is drilled through a hole perpendicular to the plane including the member body (301) by punching such as press punching. Have been. Thus, this mounting hole (304)
When setting the hole diameter of the bent part (303) of the member body (301)
Is deformed into a substantially flat shape.
The hole diameter of 4) can be set larger than the width dimension of the member main body (301).

On the other hand, one end of the member main body (301) has a circular mounting hole (305) for mounting the bush (321).
However, by punching such as press punching, it is pierced in a direction perpendicular to a plane including the member main body (301). Similarly, the other end of the member body (301) has a circular mounting hole (3) for mounting the bush (321).
06) is penetrated in a direction perpendicular to the plane including the member body (301).

The arm member (300) having the above configuration is manufactured as follows.

That is, as shown in FIGS. 17 (a) and (b), a member main body (301) made of the above-described aluminum extruded material in the form of a straight plate is used, and this is bent at a middle portion in the axial direction by a known bending method. It is bent into a substantially V-shape in one plane by processing. FIG. 18 shows the member main body (301) thus obtained. FIG. 19A shows a cross section of the bent portion (303) of the member main body (301). The cross-sectional shape of the bent portion (303) of the member main body (301) is the same as that in FIG.
The sectional shape is substantially the same as the sectional shape of the member main body (301) shown in (b).

Next, the bent portion (3) of the member body (301)
03) is subjected to plastic deformation processing, and the bent portion (303) is
It is plastically deformed in a substantially flat shape in a plane including the member main body (301). Then, a mounting hole (304) for mounting the ball joint (320) is formed in the bent portion (303).
At each end of the member body (301), mounting holes (305) and (306) for mounting the bush (321) are formed. Thus, the desired arm member (300) shown in FIG. 16 is obtained.

In the arm member (300), since the member main body (301) is made of extruded aluminum material, it has the advantage of being lightweight, and also has the advantage of being lightweight. The bent portion (303) of the member (301) is deformed into a substantially flat shape in a plane including the member body (301), so that the bent portion (303) is bent in a plane including the member body (301). Since the second moment of area with respect to the neutral axis (z) of the cross section is increased, the resistance to bending deformation in the plane including the member main body (301) is increased. Therefore, even when a load is applied to the bushes (321) and (321), the arm member (300) can be bent (303) of the member body (301).
This prevents the problem that the shape of the mounting hole (304) provided in the mounting hole (304) is distorted, so that the ball joint (320) mounted in the mounting hole (304) can be securely held. Have.

Further, in the arm member (300), since the bent portion (303) of the member main body (300) is only plastically deformed in a substantially flat shape, the weight increase accompanying the increase in the second moment of area is reduced. There is nothing at all and it is kept lightweight.

The arm members according to the first to third embodiments of the present invention have been described above. However, the arm members according to the present invention are not limited to the arm members according to the embodiments, but may be variously modified. Can be changed.

For example, in the arm member according to the present invention, the member main body may be manufactured from an extruded material having a sectional shape shown in FIGS. 20 (a) to 20 (d).
In these drawings, (z) shows a neutral axis of a cross section of the bent portion in a bending deformation in a plane including the member main body in a state where the bent portion of the member main body is not subjected to the plastic deformation processing. I have.

The member main body (401) shown in FIG. 9A is manufactured from an extruded material having a hollow portion (402) extending in the extrusion axis direction and having a substantially elliptical cross section. This extruded material has a non-uniform thickness in the circumferential direction, that is, the thickness of the peripheral wall portion on both sides in the long axis direction is thick, while the thickness of the peripheral wall portion on both sides in the short axis direction is large. It is a thin one. Note that this member body (40
1) is bent so that the direction along the long axis of the cross section is orthogonal to the plane including the member main body (401).

The member body (501) shown in FIG. 9B is made of an extruded material having a hollow portion (502) extending in the extrusion axis direction and having a substantially rectangular cross-sectional shape. The member main body (501) is bent so that the direction along the long side of the cross section is orthogonal to the plane including the member main body (501).

The member main body (601) shown in FIG. 9C is made of an extruded material having a hollow section (602) extending in the extrusion axis direction and having a circular cross-sectional shape. Further, in this extruded material, a partition wall part (601a) having a cross-shaped cross section extending in the extrusion axis direction and dividing the hollow part (602) into four parts is integrally formed on the peripheral wall part in the hollow part (602). Formed,
The peripheral wall is reinforced by the partition (601a).

The member main body (701) shown in FIG. 9D is made of a plate-shaped extruded material having a constant width, and has a widthwise intermediate portion at both ends in the widthwise direction on outer surfaces on both sides in the thickness direction. (701a), (701a), (701a), (70a)
1a) is formed, whereby recesses (701b) (701b) having an arc-shaped cross section extending in the extrusion axis direction are formed at the widthwise intermediate portions of the outer surface portions on both sides in the thickness direction. The member main body (701) is bent so that the thickness direction of its cross section is orthogonal to a plane including the member main body (701).

The arm member according to the present invention may have a yoke provided at one end or both ends of the member main body. As the member main body having the yoke portion at the end, for example, the one shown in FIG. 21B is suitably used. The member body (801) shown in FIG.
As shown in FIG. 21A, it is manufactured from an aluminum extruded material having a hollow portion (802) extending in the extrusion axis direction and having a substantially rectangular cross-sectional shape. And
A pair of opposed side walls of the four side walls at the end of the member main body (801) are cut out by cutting, press punching, or the like, whereby the end of the member main body (801) is attached to the yoke ( 808). This member body (801)
The remaining pair of opposed side walls (807) and (807) of the four side walls at the ends of the end correspond to the mounting piece of the yoke (808). A shaft insertion hole (808a) is formed in each of the side walls (807) and (807) so as to penetrate in the thickness direction of the side wall.

Further, the arm member according to the present invention comprises:
Various settings can be changed.

For example, in the arm member according to the present invention, the hollow portion in the bent portion of the member main body does not have to disappear.

In the arm member according to the present invention, the mounting hole provided in the bent portion may be for mounting a joint member other than the ball joint.
For example, it may be for mounting a bush.

In the arm member according to the present invention, the member main body may be made of a metal other than aluminum, and may be made of, for example, an iron-based material.

[0091]

As described above, according to the first aspect of the present invention, the member main body is manufactured from an extruded material in which the extrusion axis is set to the axial direction of the member main body, so that the member main body is made efficient. Therefore, it is possible to provide an arm member with a low manufacturing cost.

Further, the bent portion of the member main body is subjected to plastic deformation processing for increasing a second moment of area of the cross section of the bent portion with respect to a neutral axis in bending deformation in a plane including the member main body. Since the bending rigidity at the bent portion of the member main body is improved, the member main body is hardly bent, and the shape of the mounting hole provided in the bent portion is maintained. .
Therefore, the arm member has an advantage that the joint member mounted in the mounting hole provided in the bent portion of the member main body can be securely held.

According to the second aspect of the present invention, since the extruded material has the hollow portion extending in the extrusion axis direction, a lightweight arm member can be provided.

According to the third aspect of the present invention, since the extruded material has the hollow portion extending in the extrusion axis direction, a lightweight arm member can be provided.

Further, when setting the hole diameter of the mounting hole, the bent portion of the member main body is deformed into a substantially flat shape in a plane including the member main body, so that the bent portion is widened. It can be set larger than the outer diameter of the main body.

According to the fourth aspect of the present invention, since the extruded material has the hollow portion extending in the direction of the extrusion axis, a lightweight arm member can be provided.

Also, when manufacturing this arm member,
Since the member main body is bent so that a direction along a long axis or a long side of a cross section thereof is orthogonal to a plane including the member main body, it is possible to easily perform a bending process for bending the member main body. it can. Furthermore, in setting the hole diameter of the mounting hole, the bent portion of the member main body is deformed in a substantially flat shape in a plane including the member main body, so that the spread amount of the bent portion of the member main body due to plastic deformation processing is further increased. Therefore, the diameter of the mounting hole can be set even larger.

According to the fifth aspect of the present invention, since the extruded material has the hollow portion extending in the extrusion axis direction, a lightweight arm member can be provided.

Since the core is inserted into the hollow portion of the bent portion of the member main body, the bending rigidity at the bent portion of the member main body is increased by the amount of the core.
It is possible to provide an arm member in which the bending rigidity at the bent portion of the member main body is further increased. further,
Since the thickness of the bent portion of the member body deformed into a substantially flat shape is large by the thickness of the core, the joint member and the mounting hole are mounted in a state where the joint member is mounted in the mounting hole. Since the contact area with the peripheral surface of the arm member is increased, it is possible to provide an arm member having a mounting hole capable of stably and firmly holding the joint member. In addition, since the amount of deformation of the bent part of the member body due to plastic deformation processing is reduced by the thickness of the core, cracks due to plastic deformation do not occur on both side edges of the bent part, so strength A highly reliable arm member can be provided. Further, when setting the diameter of the mounting hole, the bent portion of the member main body is deformed into a substantially flat shape in a plane including the member main body, so that the bent portion is widened. It can be set larger than the diameter.

According to the sixth aspect of the present invention, a part of the core in the axial direction is deformed to be substantially flat along with the bent portion of the member main body. Since the movement of the armature along the axial direction of the member main body is regulated and the core is fixedly inserted into the hollow portion of the bent portion of the member main body, the joint member can be more stably and firmly held. An arm member having a mounting hole that can be provided can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an arm member according to a first embodiment of the present invention in a state where a bush and a ball joint are being mounted.

FIG. 2 is a longitudinal sectional view of the arm member.

FIG. 3 is a perspective view showing the arm member with a bush and a ball joint attached thereto.

FIG. 4 is a longitudinal sectional view showing the arm member with a bush and a ball joint attached thereto.

5A is a plan view showing a state before bending a member main body of the arm member, and FIG. 5B is a cross-sectional view taken along line V (a) -V (a) in FIG. It is.

FIG. 6 is a perspective view showing a state after a member main body of the arm member is bent.

7A is a sectional view taken along line VII (a) -VII (a) in FIG. 6, and FIG. 7B is a sectional view taken along VII (b) -VII (b) in FIG.
It is sectional drawing of a line.

FIG. 8 is a perspective view showing an arm member according to a second embodiment of the present invention in a state where a bush and a ball joint are being mounted.

FIG. 9 is a vertical sectional view of the arm member.

FIG. 10 is a perspective view showing the arm member with a bush and a ball joint attached thereto.

FIG. 11 is a longitudinal sectional view showing the arm member with a bush and a ball joint mounted thereon.

12A is a plan view showing the arm member before bending the member main body, and FIG. 12B is a cross-sectional view taken along line XII (b) -XII (b) in FIG. 12A. , (C)
It is sectional drawing of the XII (c) -XII (c) line in (a).

FIG. 13 is a plan view showing a state after a member main body of the arm member is bent.

FIG. 14 is a perspective view showing a state after the member main body of the arm member is bent.

FIG. 15 (a) is a view showing XV (a) -XV in FIG.
FIG. 8A is a cross-sectional view taken along line (a), and FIG.
It is sectional drawing of the V (b) line.

FIG. 16 shows an arm member according to a third embodiment of the present invention;
It is a perspective view shown in the state in the middle of attaching a bush and a ball joint.

17A is a plan view showing a state before bending a member main body of the arm member, and FIG. 17B is a cross-sectional view taken along line XVII (b) -XVII (b) in FIG. It is.

FIG. 18 is a perspective view showing a state after the member main body of the arm member is bent.

FIG. 19 (a) shows XIX (a) -XIX in FIG.
FIG. 16A is a cross-sectional view taken along line (a), and FIG.
It is sectional drawing of the -XIX (b) line.

FIG. 20 is a cross-sectional view of a member main body showing a modification of the member main body in the arm member according to the present invention, wherein (a) is a first modification, (b) is a second modification, and (c) is The third modified example, (b) is a fourth modified example.

FIG. 21 is a perspective view of a member main body having a yoke portion formed at an end in an arm member according to the present invention;
(A) is a perspective view showing an end of the member main body before a yoke is formed at the end, and (b) is an end of the member main body after a yoke is formed at the end. It is a perspective view shown in a state.

[Explanation of symbols]

 100, 200, 300: Arm member 101, 201, 301: Member body 102, 202: Hollow portion 103, 203, 303 ... Bend portion 104, 204, 304 ... Mounting hole 210: Core 120, 220, 320 ... Ball Joint (joint member)

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Koichi Hasegawa 3600, Gezu, Kita-gaiyama, Komaki-shi, Aichi Prefecture Inside of Tokai Rubber Industries Co., Ltd. (72) Inventor Masaharu Tochigi 224 Kaiyama-cho, Sakai City Showa Aluminum Co., Ltd. F-term (reference) 3D001 AA17 AA18 BA01 DA04 DA08

Claims (6)

[Claims] A bent portion (103, 203,
303) and at least the bent portion of the rod-shaped member main body (101, 201, 301) having a substantially V-shaped or substantially U-shaped bent axially in one plane about the bent portion;
Mounting holes (104, 20) for mounting joint members (120, 220, 320)
Arm member (100, 200, 300) provided with 4, 304)
The member main body (101, 201, 301) is manufactured from an extruded material whose extrusion axial direction is set to the axial direction of the member main body, and is formed at a bent portion (103, 203, 303) of the member main body. Is subjected to plastic deformation processing to increase the second moment of area with respect to the neutral axis (z) of the cross section of the bent portion in the bending deformation in the plane, and the bent portion has a mounting hole (104, 204, 304) are provided. 2. The arm member according to claim 1, wherein the extruded material has a hollow portion (102, 202) extending in the extrusion axis direction. 3. The extruded material has a hollow portion (102, 202) extending in the extrusion axis direction, and a bent portion (103, 203) of the member main body (101, 201).
2. The arm member according to claim 1, wherein said member is deformed into a substantially flat shape in said plane by said plastic deformation processing. 4. The extruded material has a hollow portion (102) extending in the direction of the extrusion axis, and has a substantially elliptical or substantially rectangular cross-sectional shape. The direction along the long axis or the long side of the cross section is bent so as to be substantially orthogonal to the plane, and the bent portion (103) of the member main body is formed in the plane by the plastic deformation processing. The arm member according to claim 1, wherein the arm member is deformed into a substantially flat shape. 5. The extruded material has a hollow part (202) extending in the direction of the extrusion axis, and a hollow part (202) in a bent part (203) of the member main body (201) has a middle part. The arm member according to claim 1, wherein the child (210) is fitted, and the bent portion (203) of the member main body is deformed into a substantially flat shape in the plane by the plastic deformation processing. . 6. The core (210) is cylindrical, and a part of the core (201) in a hollow portion (202) of a bent portion (203) of the member main body (201) in an axial direction of the core. 6. The arm member according to claim 5, wherein the plastic deformation is deformed into a substantially flat shape in the plane along with the bent portion of the member main body.