JPH0966718A - Attaching structure of automobile suspension member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb impact energy by limiting an increase in the weight of a car body as much as possible. SOLUTION: A structure for attaching a suspension member 12 to a car body 14 is provided with a connecting means 16 provided between the suspension member and the car body. This connecting means is provided with a projecting part 33 extended in the back and forth directions of the car body, a first member 32 attached to the suspension member, a hole 35 in which the projecting part 33 is fitted, a second member 34 attached to the car body 14 and a fixing tool 36 for fixing the first and second members 32 and 34 not detached when a normal load is applied to the suspension member and detached when an abnormal load larger than a normal load is applied to the suspension member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension member mounting structure for an automobile, and more particularly to a suspension member mounting structure that can be detached from a vehicle body when a load in the front-rear direction larger than a normal load is applied to the suspension member. This mounting structure is suitable for the front suspension of an FF vehicle, for example.

[0002]

2. Description of the Related Art A vehicle body structure has been proposed in which a tunnel-shaped flange portion is formed on a surface of a subframe facing a dash panel, and a tunnel member protruding toward the flange portion is fixed to a floor tunnel portion of the vehicle body. (Kaikaihei 3-19771 publication). In this vehicle body structure, when the subframe moves rearward during a vehicle collision, the flange portion fits into the tunnel member and absorbs collision energy.

[0003]

In order for the flange portion to be fitted into the tunnel member and to be able to absorb collision energy by friction and / or deformation of the both members, the periphery of the attachment site of the tunnel member to the floor of the vehicle body is required. It is necessary to reinforce the vehicle and increase the weight of the car body cannot be avoided.

The present invention provides a vehicle suspension member mounting structure capable of absorbing collision energy by suppressing an increase in weight of a vehicle body as much as possible.

[0005]

The present invention has a structure for mounting a suspension member supporting a suspension arm on a vehicle body, and comprises a connecting means interposed between the suspension member and the vehicle body. The connecting means has a protrusion extending in the front-rear direction of the vehicle body, has a first member attached to one of the suspension member and the vehicle body, and a hole into which the protrusion is fitted, and the other of the suspension member and the vehicle body. The second member attached to the first member and the second member so as not to be separable by a normal load applied to the suspension member and separable by a front-back load larger than the normal load applied to the suspension member. And a fixture for fixing the member.

[0006]

[Operation and effect] The suspension member is attached to the vehicle body through the connecting means. When a vehicle collides and a front-back load larger than the normal load is applied to the suspension member, the suspension member moves rearward. As a result, the fixing of the fixing tool is released, and the first member and the second member are separated, but one of the first member and the second member is attached to the vehicle body,
Since the other is attached to the suspension member, the suspension member is eventually separated from the vehicle body.

At the time of a collision, the suspension member moves rearward, and along with this, a part of the vehicle body deforms to absorb the collision energy. Further, the collision energy is absorbed by releasing the fixing of the fixing tool.

Since the suspension member is separated from the vehicle body by the load in the front-rear direction at the time of a collision, it is possible to suppress the deformation of, for example, the dash panel or the floor panel located adjacent to the suspension member.

Since the suspension member is originally connected to the vehicle body by some means, it can be said that the connecting means according to the present invention has a special form. In other words, it is a change in what it should be, and no substantial weight increase occurs.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A structure in which a front suspension member supporting a front suspension arm is attached to a vehicle body. The front suspension arm is an integral form having a substantially L-shaped or A-shaped planar shape, and has a large rigidity. On the other hand, the front suspension member has a large rigidity to withstand a normal load such as a load from a front suspension arm, a load from a steering gear box, a load from an engine mount, and a jack-up load for lifting a vehicle body. This suspension member having a large rigidity can be formed, for example, by casting two plate members so as to be hollow so as to be hollow, or by a cast aluminum product. As described above, the connecting portion between the front suspension arm and the front suspension member, both of which have great rigidity, may deform the dash panel or the floor during a collision and narrow the cabin space.

Therefore, according to the present invention, the front suspension member and the vehicle body are connected to each other via the connecting means, and the front suspension member and the vehicle body are separated from each other when a load in the front-rear direction larger than the normal load is applied to the front suspension member. Thus, the connecting means is formed so that the deformation of the dash panel and the floor can be minimized. That is, in a preferred mode, the connecting means has a protrusion extending in the front-rear direction of the vehicle body,
A first member attached to the front suspension member, a second member having a hole into which the protrusion is fitted and attached to the vehicle body, and a fixture for fixing the first member and the second member are provided. Both the first member and the second member can be made by machining or casting. In the state of being fixed by the fixture, the protrusion of the first member and the hole of the second member are closely fitted to each other to make surface contact, and the surface contact and the fixture receive a normal load. When a load in the front-rear direction that is larger than the normal load is applied, the bolts that are fixtures break,
The front suspension member is separated from the vehicle body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 3 showing a first embodiment of the mounting structure, a suspension member 12 for supporting a suspension arm 10 is mounted on a vehicle body 14. And a connecting means 16 interposed between and.

The suspension arm 10 has a large rigidity integrally formed so as to have a substantially L-shape in a plan view, and has a front connecting portion 18 and a rear connecting portion 19. On the other hand, the suspension member 12
The two plate members 22 and 24 are overlapped and welded to each other so as to be hollow and have a large rigidity. The suspension member 12 is provided with a front support portion 26 and rear support portions 27 and 28. The front connecting portion 18 of the suspension arm 10 is connected to the front support portion 26 and the rear connecting portion 19 is connected to the suspension member 12. It is connected to the rear supporting portions 27 and 28. The front supporting portion 26 and the front connecting portion 18 are connected by a connecting structure known per se using a bolt extending in the front-rear direction of the vehicle body.

The connecting means 16 has a protrusion 33 extending in the front-rear direction of the vehicle body, has a first member 32 attached to the suspension member 12, and a hole 35 into which the protrusion 33 is fitted, and is attached to the vehicle body 14. The second member 34 and the first member 32 and the second member 34 are inseparable with a normal load applied to the suspension member 12 and separable with a load applied to the suspension member 12 in the front-rear direction larger than the normal load. And a fixture 36 for fixing the.

In the illustrated embodiment, the protrusion 3 of the first member 32 is shown.
3 comprises a truncated cone-shaped tip and a cylindrical base,
The hole 35 of the member 34 is shaped so that the distal end portion and the base portion are closely fitted. The first member 32 includes a receiving portion 38 that integrally has the protrusion 33, and a through hole 39 is formed in the receiving portion 38.

The connection by the connecting means 16 is as follows. First, the protrusion 33 of the first member 32 is inserted into the hole 35 of the second member 34, and the bolt 36, which is a fixture, is attached to the second member 3.
4 and is screwed into the protrusion 33 of the first member 32 to connect the first member 32 and the second member 34. Then, the receiving portion 38 of the first member 32 is placed on the supporting portion 27 of the suspension member 12, and the through hole 39 of the receiving portion of the first member is aligned with the hole 29 of the supporting portion. And suspension arm 1
The connecting portion 19 at the rear of 0 is inserted between the support portions 27 and 28 of the suspension member 12, and the bolt 42 is attached to the support portion 28 of the suspension member 12 and the suspension arm 1.
2, the connecting portion 19 and the supporting portion 2 of the suspension member 12
The nut 44 is screwed in through the receiving portion 38 of the first member 32. As a result, the first member 32 is attached to the suspension member 12 by the same bolts 42 and nuts 44 that attach the suspension arm 10. Finally, the bolt 46 (FIG. 1) penetrating the vehicle body 14 is screwed into the second member 34 to attach the second member 34 to the vehicle body 1.
Attach to 4.

On the other hand, the suspension member 12 is attached to the vehicle body by attaching the front connecting portion 48 to the vehicle body in addition to the attachment by the connecting means 16. In this way, the suspension member 12 is attached to the vehicle body at two locations on each side, for a total of four locations. The suspension member 12 is shown in FIG.
Although the connecting means 16 arranged on the left side is shown, the connecting means 16 arranged on the right side may be formed in a plane-symmetrical shape.

In the embodiment shown in FIG. 8, the suspension member 12 is for a front suspension, and the suspension member 12 has a load f ₁ directed obliquely rearward from the front suspension arm 10 and a gear box for steering. Normal loads such as a lateral load f ₂ , an obliquely upward load f ₃ from the engine mount, and an upward jack-up load f ₄ for lifting the vehicle body work. On the other hand, at the time of a collision, the collision load F in the front-rear direction of the vehicle body acts on the suspension member 12 substantially. The collision load F is, so to speak, a load in the front-rear direction, is larger than the normal load, and has a different working direction. Therefore, it is possible to fix the first member 32 and the second member 34 inseparably under the normal load applied to the suspension member 12 and separable under the longitudinal load applied to the suspension member 12. In the embodiment shown in 1,
The bolt 36 is fixing it. Bolt 36
Is broken by the collision load F. Then, the protrusion 33 of the first member 32 and the hole 35 of the second member 34 are fitted tightly together to prevent rattling due to a normal load and to receive a normal load in various directions.

As shown in FIG. 7, the front side member 50 of the vehicle body is largely bent in the transition region between the engine compartment 52 and the vehicle compartment 54, and the front suspension arm 10 and the front suspension member 12 are bent.
Is located below the front side member 50 and to the side of the transition region. Therefore, the bolt 46 is projected from the front side member 50, and the periphery of the bolt 46 is reinforced by the tubular member 56, and the second member 34 of the connecting means is fixed to the bolt 46.
It is preferable to attach the front side member 50 to the front side member 50. The bolt 46 has a strength sufficiently larger than the strength of the bolt 36, and the bolt 46 does not break before the bolt 36 breaks.

A front suspension arm 10 and a front suspension member 12 both of which have great rigidity.
The connecting portion connected by the connecting means with the dash panel 58 and the floor 60 is apparent from FIG.
It is located near. Therefore, when the connecting portion moves rearward at the time of a collision, the dash panel 58 and the floor 60 are deformed and the space of the vehicle compartment 54 is narrowed. In the present invention, the first member 32 and the second member 34 of the connecting means 16 are separated, and the rear portion of the front suspension member 12 falls off, so that the deformation of the dash panel 58 and the floor 60 can be suppressed as much as possible. .

Referring to FIG. 4 showing the second embodiment, the mounting structure is such that the suspension member 12 supporting the suspension arm 10 is attached to the front side member 5 of the vehicle body.
Suspension member 1 to be attached to
A connecting means 66 is provided between the vehicle body 2 and the vehicle body 50. In this embodiment, the suspension arm 10 and the suspension member 12 have substantially the same structure as the above embodiment, but the connecting means 66 are different.

The connecting means 66 is separated by a first member 68 having a protrusion 69 extending in the front-rear direction of the vehicle body, a second member 70 having a hole 71 into which the protrusion 69 is fitted, and a normal load applied to the suspension member 12. A fixture 72 for fixing the first member 68 and the second member 70 so as to be impossible and separable from each other by a load in the front-rear direction larger than the normal load applied to the suspension member 12 is provided. First member 6
Reference numeral 8 substantially comprises a protrusion 69, which is welded to the front side surface of the support portion 27 of the suspension member 12. The second member 68 and the fixture 72 have the same structures as the second member 34 and the fixture 36 of the above-described embodiment, respectively.

Referring to FIG. 5 showing the third embodiment, the mounting structure is such that the suspension member 82 supporting the suspension arm 80 is attached to the front side member 5 of the vehicle body.
0 is attached to the suspension member 8
A connecting means 66 is provided between the vehicle body 2 and the vehicle body 50. In this embodiment, the suspension arm 80 and the suspension member 82 are slightly different from the previous embodiment, but the connecting means 66 has substantially the same structure as that shown in FIG.

In the embodiment shown in FIGS. 1 to 3, the connecting portion 19 at the rear end of the suspension arm has a bush 20 arranged so that its axis is in the vertical direction. It is attached to the suspension member 12 by a bolt 42 that penetrates through.
On the other hand, the suspension arm 80 of FIG. 5 has a shaft 84 that extends horizontally from the rear end portion and a bush 86 that surrounds the shaft 84. On the other hand, the suspension member 82 uses the two nuts 88 to support the support portion 83.
Have. The suspension arm 80 includes the bracket 9
0 and the support portion 83 of the suspension member 82 sandwich the bush 86, and the bolt 92 is screwed into the nut 88 to be attached to the suspension member 82.

Referring to FIG. 6 showing the fourth embodiment, the mounting structure is such that the suspension member 12 supporting the suspension arm 10 is mounted on the front side member 5 of the vehicle body.
Suspension member 1 to be attached to
The connecting means 96 is provided between the vehicle 2 and the vehicle body 50. In this embodiment, the suspension arm 10 and the suspension member 12 are substantially the same as those shown in FIG. 1, but the connecting means 96 are different.

The connecting means 96 has a projection 99 extending in the front-rear direction of the vehicle body, a first member 98 attached to the front side member 50 of the vehicle body, a hole 101 into which the projection 99 is fitted, and a suspension member. The second member 100 attached to the first member 98 and the first member 98 cannot be separated from each other by the normal load applied to the suspension member 12, and can be separated from the first member 98 that is applied to the suspension member 12 in the front-back direction larger than the normal load. A fixture 102 for fixing the two members 100 is provided.

In the illustrated embodiment, the projection 9 of the first member 98
9 is composed of a truncated cone-shaped tip and a cylindrical base,
The hole 101 of the member 100 has a shape in which the tip end portion and the base portion are closely fitted. The protrusion 99 of the first member 98 has a through hole through which the bolt 102, which is a fixture, penetrates. The first member 98 has a receiving portion 104 that is integrated with the protrusion 99 and supports the protrusion 99 on the lower side. The receiving portion 104 is attached to the front side member 50. On the other hand, the second member 100 has the hole 1 in the extension direction of the hole 101.
01 has a receiving portion 105 above, and the through hole has a receiving portion 1
It is opened on 05.

The connection by the connecting means 96 is as follows. A hole through which the bolt 102 can penetrate is formed in the support portion 27 of the suspension member 12 in advance, and the nut 108 is aligned with the hole and welded to the support portion 27. Second member 10
The zero receiving portion 105 is placed on the supporting portion 27 of the suspension member 12 to align the hole 101 with the nut 108. After that, the protrusion 99 of the first member 98 is inserted into the hole 1 of the second member 100.
01, the bolt 102, which is a fixture, is passed from the protrusion 99 of the first member 98 through the hole of the support portion 27, and the nut 10
Screw in 8. As a result, the first member 98 and the second member 100 are attached to the support portion 27 of the suspension member 12. The connecting portion 19 at the rear of the suspension arm is connected to the supporting portions 27, 28 of the suspension member 12.
Insert the bolt 42 and the bolt 42 into the suspension member 12
Support portion 28, suspension arm 12 connecting portion 1
9, the nut 44 is screwed through the support portion 27 of the suspension member 12 and the receiving portion 105 of the second member 100. As a result, the second member 100 has the same bolts 42 and nuts 44 that mount the suspension arm 10.
Is attached to the suspension member 12. Finally, the bolt 46 penetrating the front side member 50 is screwed into the receiving portion 104 of the first member 98 to make the first
The member 98 is attached to the vehicle body.

In the case of the embodiment shown in FIG. 6, when a load in the front-rear direction acts on the suspension member 12, the bolt 102, which is a fixture, is broken. As a result, the first member 98 and the second member 100 are separated, and the rear portion of the suspension member 12 falls off.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of a vehicle suspension member mounting structure according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is an exploded perspective view of another embodiment of an attachment structure for a suspension member of an automobile according to the present invention.

5A and 5B show still another embodiment of the attachment structure for a suspension member of an automobile according to the present invention, wherein FIG. 5A is an exploded perspective view and FIG. 5B is a cross section taken along line bb of FIG. It is a figure.

6A and 6B show still another embodiment of the mounting structure for a suspension member of an automobile according to the present invention, wherein FIG. 6A is an exploded perspective view and FIG. 6B is a cross section taken along line bb of FIG. 6A. It is a figure.

FIG. 7 is a view showing parts of an automobile to which an attachment structure for an automobile suspension member according to the present invention can be applied;
(A) is a side view, (b) is sectional drawing cut | disconnected by the bb line | wire of (a).

FIG. 8 is a schematic diagram showing a load acting on a suspension member.

[Explanation of symbols]

 10, 80 Suspension arm 12, 82 Suspension member 14 Vehicle body 16, 66, 96 Connecting means 32, 68, 98 First member 33, 69, 99 Projection portion 34, 70, 100 Second member 35, 71, 101 Hole 36, 72, 102 Fixing tool (bolt) 50 Front side member (car body)

Claims (1)

[Claims] 1. A structure for attaching a suspension member supporting a suspension arm to a vehicle body, comprising a connecting means interposed between the suspension member and the vehicle body, the connecting means extending in a front-back direction of the vehicle body. A first member having a protrusion and attached to one of the suspension member and the vehicle body; a second member having a hole into which the protrusion is inserted and attached to the other of the suspension member and the vehicle body; A fixture for fixing the first member and the second member inseparably under a normal load applied to the suspension member and separable under a load in the front-rear direction larger than the normal load applied to the suspension member, Mounting structure for automobile suspension members.