JPH11270608A - Bushing mounting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bush mounting member in which a bush mounting portion for mounting a bush is formed on a part of a member main body made of a rod-shaped extruded metal member, and reduces a shock at the time of collision. To provide a bush mounting member that can be used. SOLUTION: A member main body 2 is made of a rod-shaped extruded aluminum pipe material having a circular cross section. A crushed part 6 whose peripheral wall is flattened by plastic working is locally formed at a longitudinally intermediate portion of the member main body 2. Thus, the crushed portion 6 is formed so that the member main body 2 is easily buckled. The impact at the time of collision is mitigated by buckling of the member main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension arm, an engine mount,
The present invention relates to a bush mounting member such as a frame.

[0002] In this specification, the term aluminum is used to include its alloy.

[0003]

2. Description of the Related Art For example, one of bush mounting members used in automobiles includes an upper arm, a lower arm,
There is a suspension arm member constituting a suspension arm such as a trailing arm and a torsion bar.

Such a suspension arm member generally comprises a rod-shaped metal member main body and metal bush mounting portions formed at both ends thereof. The bush mounting portion has a cylindrical shape or the like. A bush mounting holding hole, such as a circle, for mounting the rubber anti-vibration bush is formed. And, it is attached to various frames of an automobile through a bush attached to the holding hole.

[0005]

By the way, there are various types of such suspension arm members, and among them, in order to reduce the impact at the time of collision,
In some cases, when a collision load exceeding a certain value is applied, buckling is required.

That is, when an automobile collides, a load is applied to the bush in a direction to bring them close to each other, so that an axial compressive load acts on the arm member. By buckling the member,
There is a demand for an arm member that can reduce the impact at the time of collision.

The present invention has been made in view of such technical background, and an object of the present invention is to provide a bush mounting member capable of reducing an impact at the time of a collision.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a bush mounting method in which a bush mounting portion for mounting a bush is formed on a part of a member body made of a rod-shaped extruded metal member. A member is characterized in that a portion to be deformed is formed locally at an intermediate portion in the longitudinal direction of the member main body so as to be easily deformed by an axial compressive load.

According to this, the production efficiency is improved by using a rod-shaped extruded metal member as the member main body.
Further, when various vehicles such as automobiles collide, an axial compressive load is applied to the member main body. However, the bush mounting member according to the present invention has an axial compressive load at an intermediate portion in the longitudinal direction of the member main body. On the other hand, since the portion to be deformed to facilitate deformation is locally formed, the member body receives an axial compressive load and deforms at the portion to be deformed upon collision. This deformation reduces the impact at the time of collision.

[0010] The portion to be deformed is, for example, a portion that has been plastically deformed so as to reduce the second moment of area. Pressing, electromagnetic forming, spinning, and the like are given as examples of plastic working that causes the plastic deformation.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show the first embodiment, FIG.
6 and 7 show a second embodiment, and FIG. 7 shows a third embodiment. In each of these embodiments, a suspension arm member of an automobile is shown as a bush attachment member.

First, a first embodiment will be described.

As shown in FIG. 1, a suspension arm member (1) of the first embodiment is joined to a rod-shaped member body (2) having a predetermined length and to both ends of the member body (2). Cylindrical rubber anti-vibration bush (4) (4)
And a bush mounting part (3) (3) for mounting the bush. In the figure, (5) and (5) are joints between the member main body (2) and the bush mounting portions (3) (3).

As the member main body (2), FIG.
As shown in FIG. 2, a pipe made of a straight aluminum extruded section having a circular cross section is used. That is,
The member main body (2) is formed by cutting a pipe made of an extruded shape having a predetermined cross-sectional shape into a predetermined length on a plane perpendicular to the extrusion direction.
The outer diameter is formed to be 00 mm and the outer diameter is 15 to 35 mm. As shown in FIG. 1, a crushed portion (6) that is locally plastically deformed to a flat state is formed at an intermediate portion in the length direction of the member main body (2). The crushed portion (6) is formed by locally crushing the peripheral wall portion of the pipe material in a flat state from a direction orthogonal to the axial direction, and is deformed by an axial compressive load. It is a part to be deformed to make it easier.

The bush mounting portion (3) is made of an aluminum die-cast material and has a circular bush mounting holding hole (11) for press-fitting the bush (4) as shown in FIG. Cylindrical body (10)
A cylindrical connecting portion (12) projecting from the outer peripheral surface of the main body (10) and having the same diameter as the outer diameter of the member main body (2); A cylindrical connecting projection (13) is provided at the center of the end face so as to project outwardly from the main body (10).

The diameter of the connecting projection (13) is set slightly larger than the inner diameter of the member body (2), and is press-fitted into one end opening (2a) of the member body (2). It can be fitted. In addition, (14) in FIG.
It is a step between the connecting portion (12) and the connecting protrusion (13).

Hereinafter, the suspension arm member (1) of the first embodiment will be described in accordance with a method of manufacturing the same.

First, as shown in FIG. 2 (i), the bush (4) is press-fitted into the holding hole (11) of the main body (10) of the bush mounting portion (3), and the bush mounting portion (3) is mounted. The connecting projection (13) is placed in the one end opening (2a) of the member body (2), and the step portion (14) is placed in the member body (2).
Press-fit until it hits the end face of. When the fitting is performed in this manner, the peripheral surface of the connecting portion (12) and the outer peripheral surface of the member main body (2) are flush with each other, and the flush state is held so as not to be unintentionally shifted.

Then, as shown in FIG. 2 (ii), the butting portion (15) of the connecting portion (12) and the end surface of the member main body (2) in this fitting portion is joined in the circumferential direction to thereby form a bush. The mounting part (3) and the member main body (2) are joined and integrated.

The joining can be carried out by a fusion welding method such as MIG, TIG, laser welding or the like, but it is desirable to carry out the joining by a friction stir welding method which is a kind of the solid phase welding method.

The case of joining by friction stir welding will be described below. That is, as shown in the figure, a large-diameter cylindrical rotor (21) and the rotor (2
A joining tool (20) having a rotor (21) and a small-diameter pin-shaped probe (22) protruded integrally and rotatably on the axis of a shoulder (21a) consisting of a flat surface of 1), The probe (22) is connected to a connecting portion (12) and a member body (2).
Into the butting part (15). As shown in FIG. 3, the tip of the probe (22) is inserted into the connecting protrusion (1).
Until it is inserted into 3), the shoulder (2) of the rotor (21) is further
It is preferable that 1a) is performed until it comes into contact with the outer peripheral surface of the connecting portion (12) and the outer peripheral surface of the member body (2), since more frictional heat can be generated.

Then, the member main body (2) and the bush mounting portion (3) are integrally rotated about the axis (P) of the member main body (2) as a rotation axis. Here, the connection protruding portion (13) of the bush mounting portion (3) is connected to the opening (2) of the member main body (2).
Since the member main body (2) and the bush mounting portion (2) are press-fitted into a), when one of them is rotationally driven, the other is connected so as to rotate integrally with the other. Therefore, the rotation operation can be performed only by rotating only one of the member main body (2) and the bush mounting portion (3), and the rotation operation can be performed extremely easily.

In this embodiment, as shown in the figure, the member main body (2) is driven to rotate in the direction of arrow A. When the member main body (2) is rotationally driven in this way, the connecting projection (13), that is, the bush mounting portion (2) is integrally rotated with the member main body (2) in the direction of arrow B.

With the probe (22) inserted in this way, the member main body (2) is rotated and the abutting portion (15) is friction stir welded in the circumferential direction, so that the member main body (2) and the bush mounting portion ( 3) is joined and integrated. Here, although not shown, a portion of the shoulder (21a) of the rotor (21) on the rotation direction side of the member main body (2) is a connecting portion (1).
2) rotating the member main body (2) in a state where the member main body (2) is pressed against the member main body (2) and a portion opposite to the pressing portion is lifted from the surface of the member main body (2); However, it is desirable in that more frictional heat can be generated and the joining state can be improved.

FIG. 4 (i) shows the suspension arm member (1 ') thus obtained. In the suspension arm member (1 '), the bush mounting portion (3)
(3) is joined to the member main body (2) in such a manner that the axial directions of the holding holes (11) and (11) are in the same direction and are orthogonal to the axis (P) of the member main body (2). Have been.

This suspension arm member (1 ')
Since the member main body (2) is made of a pipe material having a circular cross section, the space efficiency is high and the weight is light. Moreover, the member body (2) and the bush mounting portion (3)
Since both are made of aluminum, they are much lighter. Furthermore, since the member main body (2) is manufactured from the extruded shape, the manufacturing efficiency can be improved, a significant down-stroke can be achieved, and thus the suspension arm member (1 ') is inexpensive. .

Further, since the joints are joined by the friction stir welding method, which has a significantly smaller heat input than the fusion welding methods such as MIG, TIG, laser welding, etc. The attached rubber bush (4) is hardly affected by heat, the elastic properties of the bush (4) are maintained healthy, and the joint strength of the joint (5) may be reduced and thermal distortion may occur. In addition, the bonding strength is high and the bonding state is good.

Thus, the suspension arm member (1 ') shown in the figure is provided with bushings (4) (4) mounted in the holding holes (11) (11) of the bush mounting parts (3) (3). Through a bush (4) when the vehicle collides.
A load (direction C) is applied to (4) in a direction to bring them closer to each other, and a compressive load in the axial direction is applied to the member main body (2). However, in the suspension arm member (1 ') shown in the figure, even if an axial compressive load is applied to the member main body (2), the member main body (2) is unlikely to be deformed such as buckling. The impact cannot be reduced.
In particular, the pipe material used as the member body of the suspension arm member generally has a length of 200 to 600.
mm and an outer diameter of 15 to 35 mm, and since the buckling load and the tensile strength of the pipe material having such dimensions have substantially the same value, the member body (2) If the buckling load is set low, for example, by reducing the thickness of the peripheral wall portion, the tensile strength may also be low at the same time, and it may not be useful as a suspension arm member.

Therefore, in this embodiment, the peripheral wall at the intermediate portion in the longitudinal direction of the member main body (2) is connected to the axis (P) of the member main body (2) and the holding hole (3) of the bush mounting portion (3) (3). 1
1) A punch (3) having a molding surface (30a) (30a) having a predetermined shape from a direction orthogonal to the axis of (11).
0) and (30), the peripheral wall portion is plastically deformed into a substantially elliptical cross section as shown in FIG. 2 (ii) and FIG. 1 (iii) so that its cross-sectional area is not reduced as much as possible. Let it. By doing so, the opposing wall portions of the peripheral wall portion are both recessed, and the holding holes (11) (11) of the bush mounting portions (3) (3) in the cross section of the peripheral wall portion are formed.
Moment of inertia about an axis passing through the center of gravity in a direction parallel to the axis of the second member becomes smaller than the moment of inertia of another axis, and as a result, the member body (2) is crushed (6).
Buckling and the like. Further, since the cross-sectional area of the peripheral wall portion of the plastically processed member body (2) hardly decreases even after the plastic working, the tensile strength of the obtained suspension arm member (1) almost decreases. And has substantially the same value as before the plastic working.

In this manner, the peripheral wall at the intermediate portion in the longitudinal direction of the member main body (2) is locally formed with a cross section 2 by plastic working.
By forming the portion plastically deformed so as to reduce the next moment, that is, the crushed portion (6), the member main body (2) is easily buckled, so that the suspension arm member (1) can absorb impact at the time of collision. It can be alleviated. (X) and (x) in FIG. 4 (ii) indicate the amount of depression of the peripheral wall portion of the member body (2) which is depressed by the pressing force of the punches (30) and (30). x) and (x) have the same value.

Next, a second embodiment will be described. In FIGS. 5 and 6 showing the second embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals.

As shown in FIG. 5, the suspension arm member (1) according to the second embodiment is bent at an intermediate portion in the longitudinal direction of the member body (2) without changing its cross-sectional shape and dimensions. The bent portion (7) is locally formed, thereby forming a portion where the axis (P) is locally shifted. The bent portion (7) is formed in a substantially C shape.

As shown in FIG. 6 (i), the bent portion (7) is arranged such that an intermediate portion in the longitudinal direction of the member main body (2) is connected to the axis (P) of the member main body (2) and the bush mounting portion (3). And (3) a punch (3) having a molding surface (31a) having a predetermined shape from a direction orthogonal to the axis of the holding holes (11) and (11).
1) and a receiving die (32) having a molded concave portion (32a) having a predetermined shape, and locally plastically deforming into a substantially C-shape while maintaining its cross-sectional shape and dimensions. , Formed. (33) in FIG.
(33) is a holding die for holding the member body (2). Also, (y) and (y) in FIG. 2 (ii) denote a member body (2) bent by receiving a pressing force of the punch (30).
The bending amount of the bent portion (7) is shown, and these bending amounts (y) and (y) have the same value.

In this way, a bent portion (7) locally bent substantially in a C-shape by plastic working, that is, an axis (P) is locally displaced in the longitudinally intermediate portion of the member main body (2). By forming the portion, the member main body (2) is easily buckled, so that the suspension arm member (1) can reduce the impact at the time of collision.

Next, a third embodiment will be described. In FIG. 7 showing the third embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals.

As shown in the drawing, the suspension arm member (1) according to the third embodiment has a peripheral wall portion formed by plastic working with a punch (not shown) at an intermediate portion in the longitudinal direction of the member body (2). A recess (8) in which a part of the wall is locally concaved in a substantially arc shape is formed, whereby the bush mounting portion (3) in the cross section of the peripheral wall is formed.
The second moment of area on the axis parallel to the axis of the holding holes (11) and (11) of (3) is the cross-sectional moment on the other axis.
A portion smaller than the next moment and having an off-axis is formed locally. By forming the concave portion (8) in this manner, the member main body (2) is easily buckled, so that the suspension arm member (1) can reduce the impact at the time of collision.

Thus, in the suspension arm member (1) of the first to third embodiments, as described above, the peripheral wall of the plastically processed member body (2) is
The cross-sectional area of the peripheral wall portion is hardly reduced even after the plastic working due to the depression or the bending. Therefore, the tensile strength of each of the suspension arm members (1) of the first to third embodiments hardly decreases, and has substantially the same value as before the plastic deformation. Therefore, the suspension arm member (1) of the first to third embodiments can reduce the impact at the time of collision and has high strength against a load in the tensile direction. In addition, since the member body (2) is made of a pipe material, plastic working can be performed very easily.

Further, the main body of the conventional suspension arm member is often manufactured using a pipe material made of an iron-based material, but the suspension arm member (1) of the first to third embodiments is often used. ) Member body (2)
Is manufactured using pipe material as before, so there is no need to change the design, it is advantageous in design, and since the pipe material used for this is made of aluminum, the conventional It is lighter than the one.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

For example, the bush mounting portion (3) is made of an aluminum die-cast material, but the bush mounting portion main body (10), the connecting portion (12), and the connecting protruding portion (1).
After extruding an aluminum extruded member (not shown) integrally formed with 3), the slice is cut to a required thickness in the extrusion direction,
Each of the connecting portion (12) and the connecting protruding portion (13) may be cut into a columnar shape, or may be manufactured by casting, forging, or the like. In addition, although the press-fit type is shown as the bush mounting portion (3), it may be a winding type.

The bush mounting member according to the present invention is not limited to the suspension arm member (1), but may be, for example, an engine mount member.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a member main body (2), a pipe made of extruded aluminum (φ22-t2, length 300 mm, material A6)
063T5), the three types of suspension arm members (Examples 1 to 3) of the first embodiment having different dent amounts (x) and the three types of second arm members having different bending amounts (y).
The suspension arm member of the embodiment (Examples 4 to
6).

On the other hand, as a comparative example, as in these examples, as the member main body (2), a pipe material (φ22-t2, length 300 mm, material A6063) made of an extruded aluminum material was used.
Using T5), a suspension arm member (Comparative Example 1) in which the member body (2) was not subjected to plastic working was manufactured.

Next, the buckling load and the tensile strength of the suspension arm members of Examples 1 to 6 and Comparative Example 1 were examined. Table 1 shows the results.

[0045]

[Table 1] As shown in Table 1, the buckling load decreases as the dent amount (x) and the bending amount (y) increase, and the reduction amount of the buckling load is much larger than the reduction amount of the tensile strength. You can see that. That is, according to such plastic working,
It can be seen that the buckling load can be reduced while suppressing the decrease in the tensile strength as much as possible. Therefore, Examples 1 to 6
It has been found that the suspension arm member of No. 1 is easily buckled and maintains high strength against a load in the tensile direction.

[0046]

As described above, according to the present invention, a bush mounting member according to the present invention is a member in which a bush mounting portion for mounting a bush is formed on a part of a member body made of a rod-shaped extruded metal member. In the middle portion of the member main body in the longitudinal direction, a portion to be deformed is formed locally so as to be easily deformed by an axial compressive load. When receiving the impact load applied at the time, the member main body can easily be deformed at the portion to be deformed,
This deformation of the member main body has an effect that the impact at the time of collision can be reduced.

In addition, since the main body of the member is made of extruded metal, the production efficiency can be improved, the stride can be greatly reduced, and an inexpensive bush mounting member can be provided.

[Brief description of the drawings]

FIG. 1 is a view showing a suspension arm member (a bush mounting member) according to a first embodiment of the present invention;
(I) is a perspective view, (ii) is I (ii) -I (i) in (i).
i) Line sectional view, (iii) shows I (iii) -I (i
ii) It is a sectional view taken along a line.

FIG. 2 (i) is a perspective view of a member main body, a bush mounting portion and a bush, and FIG. 2 (ii) is a perspective view of a state where the member main body and the bush mounting portion are fitted and connected.

FIG. 3 shows a state in which a probe of a joining tool is inserted into a fitting portion between a member main body and a bush mounting portion.
It is sectional drawing corresponding to the I-III line.

FIG. 4 (i) is a front view showing a state before plastic working is performed on the member main body, and FIG. 4 (ii) is an enlarged front view of the member main body showing a state after plastic working is performed on the member main body.

FIG. 5 is a view showing a member for a suspension arm (a member for mounting a bush) according to a second embodiment of the present invention,
(I) is a perspective view, (ii) is V (ii) -V (i) in (i).
i) Line cross-sectional view, (iii) is V (iii) -V (i) in (i).
ii) It is a sectional view taken along a line.

FIG. 6 (i) is a front view showing a state before plastic working is performed on the member main body, and FIG. 6 (ii) is an enlarged front view of the member main body showing a state after plastic working is performed on the member main body.

FIG. 7 is a view showing a suspension arm member (a bush attachment member) according to a third embodiment of the present invention;
(I) is a front view, and (ii) is a sectional view taken along line VII-VII in (i).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Suspension arm member (Bushing mounting member) 2 ... Member main body 3 ... Bush mounting part 4 ... Bush 6 ... Crushed part 7 ... Bent part x ... Depression amount y ... Bending amount

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masatoshi Enomoto 6,224 Kaiyamacho, Sakai City Showa Aluminum Co., Ltd. (72) Inventor Naoki Nishikawa 6,224 Kaiyamacho Sakai City, Showa Aluminum Co., Ltd. 72) Inventor Noriyuki Iwakiji, 224 Kaiyamacho, Sakai City, Showa Aluminum Co., Ltd.

Claims (2)

[Claims] A bush mounting member (1) in which a bush mounting portion (3) for mounting a bush (4) is formed on a part of a member main body (2) made of a rod-shaped extruded metal member. A member for mounting a bush, wherein a portion to be deformed to be easily deformed by a compressive load in an axial direction is locally formed in an intermediate portion in a longitudinal direction of the member main body (2). 2. The bush mounting member according to claim 1, wherein the portion to be deformed comprises portions (6) and (8) that have been plastically deformed so as to reduce the second moment of area.