JPH11254932A - Bush mounting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bush mounting member for absorbing a shock at the time of a collision without thinning the thickness of a bush mounting member. SOLUTION: Bush moving spaces 13 are formed in nearby a bush mounting holding holes 12. When an automobile collides, bushes 20 mounted in the holding holes 12 receive a shock load at the time of a collision, and move into the spaces 13 while plastically deforming partitioning wall parts 15 between the holes 12 and the spaces 13. A shock at the time of a collision can be relaxed by the plastic deformation of the partitioning wall part 15 created at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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 includes a rod-shaped metal member main body and metal bush mounting portions formed at both ends thereof, and 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.

By the way, there are various types of such suspension arm members. Among them, when a collision load of a certain value or more is applied to alleviate the impact at the time of collision. , Some are required to be deformed.

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. The arm member is required to be able to reduce the impact at the time of collision by bending or buckling the member. For example, 1.3 to 2.6 to
An arm member that bends or buckles when subjected to a compressive load in the range of n is required. On the other hand, the arm member must be able to withstand a load in a direction different from the direction in which the collision load is applied, for example, a load of 2.6 ton or more against an axial tensile load.

[0007]

In the case of such an arm member, if the thickness of the member itself is reduced, deformation such as bending or buckling is likely to occur, and the impact can be reduced. On the other hand, when a load is applied in a direction different from the direction in which the collision load is applied, a problem arises in that the thickness is reduced, the strength is reduced, and the material is unintentionally deformed or broken.

The present invention has been made to solve such a problem, and can reduce the impact at the time of collision without reducing the thickness of a bush mounting member such as a suspension arm member. An object is to provide a member for mounting a bush.

[0009]

In order to achieve the above object, a member for mounting a bush according to the present invention is provided such that when a shock load is applied near a holding hole for mounting a bush, a partition wall is interposed therebetween. A bush moving space for moving the bush attached to the holding hole while plastically deforming the partition is formed.

According to this, the impact at the time of collision of various vehicles such as automobiles is reduced by the plastic deformation of the partition wall.
Further, since the impact is not reduced by reducing the thickness of the bush mounting member itself, there is no unintended deformation or breakage.

When the thickness of the partition is thinner than that of the peripheral wall of the holding hole other than the partition, the partition is easily plastically deformed, and the impact at the time of collision can be reliably reduced. To relax.

Similarly, when a thin portion is formed in a part of the partition, the partition is easily plastically deformed, so that the impact at the time of collision is reliably reduced.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a member for a suspension arm of an automobile is shown as a member for mounting a bush.

As shown in FIG. 1, a member (1) for a suspension arm according to this embodiment has a rod-shaped member main body (2).
And bush mounting portions (10) (10) for mounting cylindrical rubber anti-vibration bushes (20) (20) joined to both ends of the member body (2). (3) in the figure is a joining portion between the member main body (2) and the bush mounting portion (10).

As shown in FIG. 2, the member main body (2) is made of a pipe made of extruded aluminum having a circular cross section.

The bush mounting portion (10) includes a main body (11) having a circular bush mounting holding hole (12) for press-fitting the bush (20), and the main body (1).
A cylindrical connecting projection (17) integrally protruded from 1).
And

The connecting projection (17) has a diameter slightly larger than the inner diameter of the member main body (2), and is provided in the openings (2a) and (2a) of the member main body (2). It can be press-fitted.

The diameter of the holding hole (12) of the main body (11) is set slightly larger than the outer diameter of the bush (20), and the bush (20) is connected to the holding hole (12).
Can be press-fitted. Also,
In the vicinity of the member main body (2) side of the holding hole (12) in the main body (11), a substantially rectangular bush movement having a width equal to or larger than the diameter of the holding hole (12). A space (13) is formed, and between the holding hole (12) and the space (13), a partition wall (15) curved in an arc shape in the width direction is formed. This partition (1
5) is a part constituting a part of the peripheral wall part (14) of the holding hole (12), and has a thickness greater than that of the part (16) other than the partition part (15) in the peripheral wall part (14). It is formed thin.

The thickness of the partition (15) and the thickness of the portion (16) other than the partition (15) in the peripheral wall (14) of the holding hole (12) are attached to the holding hole (12). For example, the following settings are made for the load applied to the bush (20). That is, the partition (15)
The wall thickness is set so that the plastic deformation does not occur with a load of less than 1.3 ton and the desired plastic deformation occurs with a load within the range of 1.3 to 2.6 ton. On the other hand, the portion (16) of the peripheral wall portion (14) of the holding hole (12) other than the partition wall portion (15) is 2,6 ton.
In addition to the following loads, the thickness is set so that plastic deformation does not occur even with a load exceeding 2.6 tonnes, so that breakage and deformation do not occur unintentionally.

The bush mounting portion (10) having such a configuration is
An aluminum extruded section having a predetermined cross-sectional shape is sliced into a predetermined thickness in a plane intersecting with the extrusion direction, and then a connecting projection (17) is formed into a cylindrical shape by cutting.

Next, a method of manufacturing the suspension arm member (1) of this embodiment will be described.

First, the bush (20) is press-fitted into the holding hole (12) of the bush mounting portion (10).
The connecting protrusion (17) of the bush mounting portion (10) is press-fitted into the opening (2a) of the member body (2).

Next, as shown in FIG. 3, the fitting portion between the connecting projection (17) and the member main body (2) is circumferentially joined by various joining methods, so that the bush mounting portion (10).
And the member body (2) are joined and integrated.

The joining may be performed by a fusion welding method such as MIG, TIG, or laser welding, but is preferably performed by a friction stir welding method, which is a kind of solid phase welding method.

The case of joining by the friction stir welding method will be described as follows. That is, a small-diameter cylindrical rotor (31) and a small-diameter rotor (31) projecting on the axis of a shoulder (31a) formed of a flat surface of the rotor (31) so as to be rotatable integrally with the rotor (31). A probe (32) using a joining tool (30) having a pin-shaped probe (32)
Is inserted from the outer peripheral surface of the member main body (2) at a fitting portion between the connecting projection (17) and the member main body (2). Insertion is continued until the tip of the probe (32) is inserted into the connecting projection (17), and then the shoulder (31a) of the rotor (31) is further inserted.
Is carried out until the contact with the outer peripheral surface of the member body (2)
This is desirable because more frictional heat can be generated.

Then, the member main body (2) and the bush mounting portion (10) are integrally rotated about the central axis (P) of the member main body (2) as a rotation axis. Here, the bush mounting part (1
Since the connecting projection (17) of (0) is press-fitted into the opening (2a) of the member main body (2), the member main body (2)
The bush mounting portion (10) and the bush mounting portion (10) are connected so that when one of them is driven to rotate, the other also rotates integrally therewith. Therefore, the rotation operation can be performed only by rotating one of the member main body (2) and the bush mounting portion (10), and the rotation operation can be performed extremely easily.

In this embodiment, 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 manner, the bush mounting portion (10) rotates in the direction of arrow B integrally therewith.

With the probe (32) inserted in this way, the member main body (2) and the bush mounting part (10) are rotated by rotating the member main body (2) to frictionally stir the fitting part in the circumferential direction. Are joined and integrated. Here, although not shown, the portion of the shoulder (31a) of the rotor (31) on the rotation direction side of the member body (2) is pressed against the member body (2), and By rotating the member main body (2) in a state where the opposite side part is raised from the surface of the member main body (2), more frictional heat can be generated, and the joining state can be improved. In terms, it is desirable.

In the suspension arm member (1) thus obtained, the member body (2) is made of a pipe having a circular cross section, so that the space efficiency is high and the weight is low. Moreover, since the member body (2) and the bush mounting portion (10) are both made of aluminum, the weight is further reduced.

Further, since the joints are joined by a friction stir welding method having a smaller heat input than that of fusion welding such as MIG, TIG, laser welding, etc., the joints are mounted in the holding holes (12) of the bush attaching portion (10). The rubber bush (20) is hardly affected by heat, the elastic properties of the bush (20) are maintained sound, and the joint (3) does not decrease in the joint strength and does not suffer from thermal distortion. The strength is high and the bonding state is good.

The suspension arm member (1)
Is mounted on various frames of a vehicle through a bush (20) mounted in a holding hole (12) of a bush mounting portion (10). In order to do so, it is deformed as follows.

That is, when an automobile collides, as shown in FIG. 4 (i), the bush (20) is subjected to an impact load (in the direction of arrow C), that is, to compress the member body (2) from the axial direction. (For example, load within the range of 1.3 to 2.6 ton)
And the bush (20) moves toward the member main body (2). As described above, the partition (1) is located near the holding hole (12) near the member main body (2).
Since the bush moving space (13) is formed across the bush (5), as shown in FIG. 4 (ii), the bush (20) moves the bush moving space (13) while plastically deforming the partition (15). 13). The impact at the time of collision can be reduced by the plastic deformation of the partition (15) generated at this time.

On the other hand, a load in a direction different from the direction in which the collision load is applied, for example, a load (direction d) in a direction to separate the bushes (20) and (20) from each other, applies a tensile load to the member body (2). Works, the bush (2
0) is firmly received by a part (16) other than the partition part (15) in the peripheral wall part (14) of the holding hole (12),
The member main body (2) and the bush mounting portions (10) (10) are prevented from being deformed or broken.

In this way, the bush mounting member (1) can reduce the impact at the time of collision and has high strength against a load in a direction different from the direction in which the collision load is applied.
Is provided.

Further, the bush mounting portion (10) may be configured as shown in FIG. In the figure, the same reference numerals are given to the same elements as those in the above-described embodiment.
This embodiment will be described focusing on differences from the above embodiment.

In this embodiment, the thickness of the partition (15) and the thickness of the portion (16) other than the partition (15) in the peripheral wall (14) of the holding hole (12) are the same. Is set. And, in the middle part of the inner peripheral surface of the partition wall part (15), a V-shaped notch is formed, whereby
A thin wall portion (1) formed locally in the partition wall portion (15) to be thin.
5a) is formed. Thus, the thin portion (15a)
Is formed, the partition wall portion (15) is easily plastically deformed, and therefore, the impact at the time of collision can be reliably reduced.

Although the two embodiments of the present invention have been described above, the present invention is not limited to these embodiments and can be variously modified.

For example, the bush mounting portion (10) may be made of an aluminum die-cast material, or may be manufactured by casting or forging. Naturally, the bush mounting member according to the present invention
It is not limited to the suspension arm member (1), but may be, for example, an engine mount member.

[0039]

As described above, according to the present invention, the bush mounting member according to the present invention includes a bush mounted in the holding hole when receiving an impact load in the vicinity of the bush mounting holding hole with a partition wall therebetween. Since the bush movement space for moving while plastically deforming the partition is formed,
In the event of a collision, the bush mounted in the bush mounting holding hole may move toward the bush moving space side while plastically deforming the partition, and due to the plastic deformation of the partition generated during this movement, The impact at the time of collision can be reduced. Also, since the impact is not reduced by reducing the thickness of the member itself, even if a load is applied in a direction different from the direction in which the impact load is applied, it may be unintentionally deformed or broken. Has the advantage that there is no

In the case where the partition wall is formed to be thinner than the portion other than the partition wall in the peripheral wall of the holding hole, the partition wall can be easily plastically deformed. Can reliably be mitigated.

When a thin portion is formed in a part of the partition wall, the partition wall can be easily plastically deformed as described above, and the shock at the time of collision can be reliably reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a member for a suspension arm (a member for mounting a bush) according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the suspension arm member separated into a member main body, a bush mounting portion, and a bush.

FIG. 3 is a front view showing a state in which the suspension arm member is being manufactured, in which (i) a connecting projection of a bush mounting portion is fitted into an opening of the member main body;
(Ii) is a cross-sectional view corresponding to line III-III in (i), showing a state in which the probe of the welding tool is inserted into the fitting portion.

4A and 4B are diagrams illustrating the suspension arm member, wherein FIG. 4I is a front view, and FIG. 4B is a front view of a state in which a bush has been moved by an impact at the time of a collision.

FIG. 5 is a front view showing a suspension arm member according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Member for suspension arm (member for bush mounting) 2 ... Member main body 10 ... Bush mounting part 12 ... Holding hole for bush mounting 13 ... Bush moving space 15 ... Partition wall 20 ... Vibration-proof bush

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Ogawa Komaki-shi, Aichi 3600 Gezu, Kita-gaiyama Tokai Rubber Industries Co., Ltd. Inside (72) Inventor Naoki Nishikawa 6,224, Kaiyamacho, Sakai City Inside Showa Aluminum Co., Ltd. (72) Inventor Noriyuki Iwakichi, 224 6, Yamayamacho, Sakai City Inside Showa Aluminum Co., Ltd.

Claims (3)

[Claims] 1. In the vicinity of a bush mounting holding hole (12),
A bush (20) attached to the holding hole (12) when receiving an impact load is separated from the partition (15) by the partition (15).
5) A bush mounting member, wherein a bush moving space (13) for moving while plastically deforming the bush is formed. 2. The partition (15) is provided with the holding hole (12).
(16) other than the partition (15) in the peripheral wall (14)
The bush mounting member according to claim 1, wherein the member is formed to be thinner than the wall. 3. A thin part (15) is provided on a part of the partition part (15).
The member for mounting a bush according to claim 1, wherein a) is formed.