JP2558116Y2 - Suspension member structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a suspension member structure of an automobile.

[Conventional technology]

In a vehicle, a suspension member extends in the vehicle width direction, and a suspension arm is supported at a widthwise intermediate portion of the suspension member. Explaining a front-wheel drive vehicle that adopts a dual-link rear suspension, the rear suspension member that extends in the vehicle width direction has a body width direction end attached to the lower surface of the side member with bolts or the like. A suspension lower arm is swingably supported at a middle portion in the direction via a shaft member whose axis is oriented in the vehicle longitudinal direction.

However, in this type of suspension member, the intermediate portion in the vehicle body width direction is bent to be separated from the lower surface of the side member 10 as shown in FIG. The offset amount 1 with respect to the supporting point was extremely large. For this reason, a load in the vehicle front-rear direction (horizontal direction in FIG. 6) input from the suspension lower arm 14 causes an arrow A in FIG.
It tended to swing in the direction, which hindered the improvement of steering stability.

Therefore, conventionally, in order to improve the steering stability, not only the widthwise end of the suspension member is attached to the vehicle body, but also the widthwise middle portion of the suspension member is firmly attached to the cross member or the like directly or through a bracket. It has been considered to improve the rigidity of attachment of the suspension member to the vehicle body by connecting the suspension members (Japanese Utility Model Laid-Open No. 50706/1988,
2-251218).

However, in this case, the suspension member is also supported near the substantially central portion of the vehicle body, so that vibration and noise are transmitted from the suspension lower arm to the substantially central portion of the vehicle body via this support portion, and the vibration and noise are reduced. There was a problem that accompanied by the deterioration of. Especially for anti-vibration and soundproofing,
In an automobile in which both ends in the width direction of the suspension member are elastically supported by a side member or the like, the vibration and noise proof effects are significantly reduced, and the vibration and noise are significantly deteriorated.

In consideration of the above facts, the present invention suppresses the vibration caused by the load in the longitudinal direction of the vehicle input from the suspension arm and improves the steering stability without deteriorating vibration and noise. The goal is to obtain

[Means for solving the problem]

The present invention is mounted on a side member having an inclined portion in the vertical direction of the vehicle body along the longitudinal direction of the vehicle body, extended in the vehicle body width direction, and supported by the side member by attaching an end of the vehicle width direction to the side member. And a suspension member having an intermediate portion which is bent downward while being supported by the side members and in which the suspension arm is swingably supported. Extending in at least one direction, deforming the extended portion so as to approach in a height direction with respect to the suspension arm support portion of the intermediate portion to form a mounting portion to a lower portion of the side member; And a reinforcement member for connecting the two portions substantially horizontally in a straight line between the support arm and the suspension arm support portion.

[Action]

In the present invention having the above-described structure, the attachment point to the suspension member is approached in the height direction with respect to the support point of the suspension arm by the extension portion, and the offset amount at both points is reduced. The bending moment with respect to the load in the vehicle body front-rear direction can be reduced, whereby the vibration in the vehicle body front-rear direction can be suppressed. Also, when looking at the relationship between the input position of the load from the suspension arm and the mounting position of the reinforcing member connected to the extension, the reinforcing members are arranged in a substantially horizontal straight line at substantially the same height. The input load from the suspension arm can be received by the tensile and compressive force of the reinforcing member.

Further, since the intermediate portion and the extension portion of the suspension member are connected by a reinforcing member to have a substantially triangular structure in plan view, the rigidity of the suspension member itself can be improved, and the suspension arm The extension member of the suspension member itself can receive the tensile and compressive force to the reinforcing member based on the input load of the suspension member, so that the suspension member itself can swing the suspension member based on the input load from the suspension arm. Curb,
Unnecessary loads are not transmitted to the side members.

〔Example〕

1 to 5 show a rear suspension member 20 of a dual link type rear suspension for a front-wheel drive vehicle to which the present invention is applied. In the drawing, the direction of arrow FF is the front of the vehicle body.

Rear suspension member 20 extending in the vehicle width direction
As shown in FIG. 3, both ends of the vehicle body width direction are attached to the lower surface of the side member 26 by bolts 24 at two positions in the vehicle body front-rear direction. As shown in FIG. 3, the side member 26 has a slope from the upper side to the lower side of the vehicle body from the rear side of the vehicle body to the front side. As shown in FIG. 3, a lower arm bracket front 28 and a lower arm bracket 30 are attached to the rear suspension member 20 at the middle portion in the vehicle body width direction and on both sides in the vehicle front-rear direction, respectively. A rear suspension lower arm 32 is swingably supported via a lower arm bracket 30.

The rear suspension member 20 will be described in detail. As shown in FIG. 3, the rear suspension member 20 is formed in a closed cross section by coupling the upper panel 34 and the lower panel 36, and is an intermediate portion in the width direction. A lower arm bracket front 28 and a lower arm bracket 30 are welded to the upper surface.

As shown in FIG. 1, two lower arm bracket fronts 28 are arranged side by side in the vehicle body width direction to individually support the rear suspension lower arms 32 on the left and right sides. As shown in FIG. 5, a shaft 43 extending in the longitudinal direction of the vehicle body as shown in FIG. 3 is inserted through the lower arm bracket front 28 at an intermediate portion in the height direction of the front wall 28A bent downward as shown in FIG. One end of the rear suspension lower arm 32 is rotatably supported by the shaft 43 on the rear side of the front wall 28A via the lower arm bush 42 (see FIG. 5). The lower arm bush 42 is a rear suspension member from the lower suspension 32 to the rear suspension member 20.
It absorbs the vibration input to.

As shown in FIG. 1, each of the lower arm bracket fronts 28 extends diagonally forward toward the outside in the vehicle width direction, and the front ends thereof are end portions in the vehicle width direction and are attached to the side members 26 on the front side of the vehicle body. It is also welded to the lower surface and doubles as a reinforcing member (see FIG. 4).

The lower arm bracket 30 supports both the left and right rear suspension lower arms 32, and the supporting structure is the same as the lower arm bracket front 28. That is, in the lower arm bracket 30, two shafts 4 are provided on the rear wall 30A bent downward.
3, one end of each of the left and right rear suspension lower arms 32 is rotatably supported by the shaft 43 via the lower arm bush 42 on the rear side of the rear wall 30A.

The rear suspension member 20 has both ends in the width direction bent upward at the outer side in the vehicle width direction from the mounting portions of the lower arm bracket front 28 and the lower arm bracket 30 as shown in FIGS. An extension 44 extending toward the front of the vehicle body and an extension 46 extending toward the rear of the vehicle body are formed at the distal end thereof, and these are extended along the lower surface of the side member 26, respectively.

The extension part 44 is a general part whose tip is the width direction end due to the bending structure
It extends substantially horizontally below the 50 in the longitudinal direction of the vehicle. That is, the side member 26 is bent below the rear seat (not shown), and the extension portion 44 is bent along the bent side. Due to this bending, the lower surface of the distal end portion of the extension portion 44 has substantially the same height as the upper surface of the mounting portion of the lower arm bracket front 28 and the lower arm bracket 30 as shown in FIGS.

A body mount 48 as shown in FIG. 4 is mounted on the extension portion 44 at the distal end, and the bolt 24 shown in FIG. 3 is screwed into the side member 26 through the body mount 48. An extended portion of the lower arm bracket front 28 extending outward in the vehicle width direction is welded to a lower surface of a distal end portion of the extended portion 44 as an attachment portion to the vehicle body. The body mount 48 absorbs vibration input to the vehicle body from the rear suspension lower arm 32 via the rear suspension member 20. The upper surface of the lower arm bracket front 28 is substantially horizontal as shown in FIGS. 2 and 3 due to the bending of the extension 44.

The extension portion 46 extends substantially horizontally rearward from the general portion 50, and a body mount 48 is attached to a tip portion thereof, and the bolt 24 shown in FIG. 3 is screwed to the side member 26 through the body mount 48. It has become.

 Next, the operation of the present embodiment will be described.

In the rear suspension member 20, the bolt 24 is screwed into the side member 26 through the body mount 48 at the tip of the extension portions 44 and 46, and both ends in the vehicle width direction are supported by the vehicle body at two places in the vehicle front-rear direction. Also, the lower arm bracket front
28 front wall 28A and lower arm bracket 30 rear wall 30A
The shaft 43 is inserted through the rear wall 30A of the lower arm bracket 28 and the rear wall 30A of the lower arm bracket 30.
Rear suspension lower arm 32 to shaft 43 on the back side of
Is rotatably supported via a lower arm bush 42. Thus, the rear suspension member 20 is used for supporting the rear suspension lower arm 32.

Here, the rear suspension member 20 is configured such that the distal end portion of the extension portion 44 is a general portion 50 having a widthwise end portion due to the bending structure of the extension portion 44.
The body mount 48 is attached to the tip of the vehicle body at a position lower than the body mount 48, and is attached to the lower surface of the side member 26 via the bolt 24 at this portion.
44, the point of attachment to the side member 26 becomes closer to the support point of the rear suspension lower arm 32 in the height direction, and the offset l (shown in FIG. 3) at both points is reduced, so that the rear suspension lower arm The bending moment with respect to the load in the longitudinal direction of the vehicle input from 32 can be reduced, whereby the vibration in the longitudinal direction of the vehicle can be suppressed. Also, the rear suspension lower arm
Looking at the relationship between the input position of the load from 32 and the mounting position of the lower arm bracket 28 connected to the extension parts 44 and 46, the lower arm bracket 28 is arranged in a substantially horizontal straight line at substantially the same height. For the rear suspension lower arm
The input load from 32 can be received by the tension and compression force of the lower arm bracket 28, which is advantageous in terms of the weight and strength of the lower arm bracket 28 itself.

Further, since the intermediate portion and the extended portion of the rear suspension member 20 are connected by a lower arm bracket 28 to form a substantially triangular structure in plan view, the rear suspension member 20
The rigidity of the rear suspension member 20 itself can be improved, and the extension 44 of the rear suspension member 20 itself can receive the tensile and compressive force to the lower arm bracket 28 based on the input load from the rear suspension lower arm 32. The rear suspension member 20 itself suppresses the deflection of the rear suspension member 20 based on the input load from the rear suspension lower arm 32, so that an unnecessary load is not transmitted to the side member 26.

Also, since the rear suspension member 20 is attached to the lower surface of the side member 26 by the bolts 24 at the end portions of the extension portions 44 and 46, the mounting pitch to the side member 26 increases in the vehicle front-rear direction. Deflection due to the load in the vehicle longitudinal direction input from the lower arm 32 is suppressed.

Since the lower arm bracket front 28 is used to improve the rigidity against a load in the vehicle longitudinal direction input from the rear suspension lower arm 32, the number of parts does not increase, and the weight does not increase much.

Further, since the rear suspension member 20 has only the distal ends of the extension portions 44 and 46 attached to the side members 26 and is supported near the widthwise end of the vehicle body, vibration and noise are not deteriorated.

As described above, in the present embodiment, the vibration of the rear suspension member 20 due to the load in the front-rear direction of the vehicle body input from the lower suspension lower arm 32 is not accompanied by the deterioration of vibration and noise.
The steering stability can be improved by suppressing the vibration of the vehicle.

In the present embodiment, the extension portion 44 is bent along the side member 26 so that the tip extends below the general portion 50 in the vehicle longitudinal direction. A bracket for attaching the portion member may be fixed, and the extension portion 44 may be positively bent and attached to the lower surface of the side member 26 below the general portion 50 via the bracket. Also, due to this mounting structure, the tip of the extension portion 46 on the rear side of the vehicle body is located below the general portion 50 and the side member
It may be attached to the lower surface of 26.

Further, the lower arm bracket front 28 is extended to linearly connect the support portion of the suspension lower arm 32 and the mounting portion to the side member 26, but the rear suspension lower arm is provided separately from the lower arm bracket front 28.
A reinforcing member may be provided to connect the support portion 32 and the mounting portion to the rear suspension member 20. For example, a longitudinal reinforcing member having one end welded to the lower arm bracket front 28 and the other end welded to the lower surface of the side member 26 may be provided.

[Effect of the invention]

As described above, in the suspension member structure according to the present invention, the end portion in the vehicle width direction is extended in at least one direction in the vehicle longitudinal direction, and the extended portion has a height relative to the suspension arm support portion in the intermediate portion. In addition to being deformed so as to approach in the direction to form a mounting portion to the lower portion of the side member, a reinforcing member is provided between the mounting portion and the suspension arm support portion for connecting both portions substantially linearly and linearly. Therefore, there is an excellent effect that the steering stability can be improved by suppressing the vibration caused by the load in the longitudinal direction of the vehicle input from the suspension arm without deteriorating the vibration and the noise.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rear suspension member to which the present invention is applied, FIG. 2 is a front view of a main part of FIG. 1 as viewed from the front side of the vehicle body, and FIG. 3 is a view taken along the line III-III of FIG. Sectional view, fourth
FIG. 5 is a sectional view taken along the line IV-IV in FIG. 1, FIG. 5 is a sectional view taken along the line VV in FIG. 1, and FIG. 6 is a sectional view showing a conventional suspension member structure. 20 ... Rear suspension member, 26 ... Side member, 28 ... Lower arm bracket front, 32 ... Rear suspension lower arm, 44, 46 ... Extension, 50 ...
General part.

Claims (1)

(57) [Scope of request for utility model registration] 1. A side member having an inclined portion in the vehicle body vertical direction along the vehicle body front-rear direction, extending in the vehicle body width direction, and attached to the side member at an end of the vehicle body width direction to the side member. A suspension member having an intermediate portion that is supported and is bent downward while being supported by the side members, and the suspension arm is swingably supported. And extending the extended portion so as to approach the suspension arm support portion of the intermediate portion in the height direction to form an attachment portion to a lower portion of the side member, and A suspension member structure, wherein a reinforcing member is provided between the support portion and the suspension arm support portion for connecting the two portions substantially horizontally in a straight line.