JPH0999867A - Sub-frame support structure for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the rigidity of a sub-frame support section and reduce the weight. SOLUTION: A sub-frame bracket 11 is connected by welding to a front side frame 1 provided at the front section of an automobile and a front bulkhead lower member 6 connected in the suspended state from the lower face of the front end section of the front side frame 1 respectively at a corner section formed by them. The front end section of a sub-frame 12 is matched with the lower end face of the sub-frame bracket 11, and it is fixed by a fitting bolt 14. Since the sub-frame bracket 11 is connected to the front side frame 1 and the front bulkhead lower member 6, high rigidity can be obtained. The steering stability and comfortableness is improved, no separate member is required for reinforcement, and the weight can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile sub-frame supporting structure as a sub-frame mounting structure provided in a front portion of an automobile body.

[0002]

2. Description of the Related Art Conventionally, in an automobile having a sub-frame at the front of the vehicle body for supporting an engine, and a vehicle body having a monocoque structure, the frame shape depends on the degree of freedom of the press-molded frame. Was changed to form the sub-frame mounting portion.

[0003]

On the other hand, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Unexamined Patent Publication No. 0-135375, in a space frame structure configured by using a light metal extruded material such as an aluminum alloy as a basic frame, the front side frame is formed in a straight line and is formed in the engine room. Since it extends at a relatively lower portion, it is necessary to attach a bracket made of a separate member or use a structure in which the shape of the sub-frame is adjusted to the frame.

However, in the above structure, it is difficult to position the sub-frame upward due to the restriction of the layout in the engine room. Therefore, it is necessary to use a bracket which is a separate member. In this case, in order to secure the rigidity of the sub-frame support portion, the shape and plate thickness of the bracket have been optimized to deal with the problem, but there is a problem that the bracket becomes complicated.

Further, in order to further improve the NVH performance for weight saving and improvement of the commercial property due to recent environmental problems, in the sub frame supporting structure, the rigidity of the sub frame mounting portion is improved. It is desirable to let

[0006]

In order to solve the above problems and to realize a sub-frame supporting structure which can secure the rigidity of the sub-frame supporting portion and improve the weight reduction,
According to the present invention, a front side frame is provided at a front portion of the vehicle body so as to extend in the front-rear direction, and a front bulkhead member is connected to a front end portion of the front side frame in a hanging state. The front end of the sub-frame supporting the engine is supported by a bracket connected to both the front end of the front side frame and the front bulkhead member.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail based on specific examples shown in the accompanying drawings.

FIG. 1 is a perspective view of an essential part showing a part of a front frame of an automobile to which the present invention is applied. The frame of this automobile is constructed by combining frame members obtained by extruding a light metal material such as an aluminum alloy.

In the front part of the automobile, as shown in FIG. 1, front side frames 1 are provided on the left and right of the front part of the vehicle body so as to extend in the front-rear direction. Front damper support 2 is erected near the floor, and front damper support 2
A front damper housing 4 is fixedly mounted on the upper end of the front damper member 4. A front upper member 3 is slantingly provided between the front damper housing 4 and the front end portion of the front side frame 1 on the vehicle front side. The front side frame 1, the front damper support 2, and the front upper member 3 are formed by extruding in a rectangular closed cross section.

The front side frame 1 is provided from a connecting portion with a floor frame (not shown) constituting a floor of a vehicle interior to a front bumper attaching portion attached to a front end portion of the vehicle. A front bumper mounting member 5 is hung and fixed between the front ends of both front side frames 1 so as to extend in the vehicle width direction, and a front bumper is attached to the lower surface of each front end of both front side frames 1. A bulkhead lower member 6 as a front bulkhead member located below the bumper mounting member 5 is fixed in a suspended state.

An unillustrated dashboard lower member 7 is provided so as to extend in the vehicle width direction between the lower portions of the front damper supports 2. Further, a front pillar lower member 8 is provided upright on the vehicle interior side of the front side frame 1 with respect to the front damper support 2, and a front pillar upper node 9 is provided on the upper end of the front pillar lower member 8. A front damper rear member 10 is provided between the upper end of the damper support 2 and the front pillar upper node 9 in a stretched state.

Subframe brackets 11 welded to the corners of the inverted L shape formed by the lower surface of the front end of the front side frame 1 and the bulkhead lower member 6 are provided. . The vehicle front end of the subframe 12 is attached to the lower end of the subframe bracket 11, and the vehicle rear end of the subframe 12 is bolted to a frame 13 on the passenger compartment floor side coupled to the front side frame 1. It is installed in. The sub-frame 12 has support brackets 12 for supporting an engine (not shown) in place.
a to 12c are integrally provided.

The sub-frame bracket 11 of this illustrated example
Is manufactured by aluminum die casting, and as shown in FIG. 2, since the width dimensions of the front side frame 1 and the bulkhead lower member 6 are different from each other, the subframe brackets 11 are joined to each other. A pair of flange portions 11a and 11b facing each other with an opening width corresponding to each width is formed in the portion. Further, a cylindrical boss portion 11c for bolting the front end portion of the subframe 12 is integrally formed on the bottom wall which is a lower side when the subframe bracket 11 is attached.

Then, each of the flange portions 11a and 11b described above.
2 are welded to the corresponding front side frame 1 and the bulkhead lower member 6 and are coupled as shown in the phantom line in FIG. The front end portion of the sub-frame 12 is attached to the sub-frame bracket 11 by inserting the mounting bolt 14 inserted through the front end portion 12 and screwing it with a nut member (not shown).

Although the sub-frame bracket 11 can be manufactured by aluminum die-casting as described above, the number of parts can be reduced and the cost can be improved, but the invention is not limited to aluminum die-casting. A plate material made of an aluminum alloy may be pressed and assembled so as to have the shape shown in the drawing.

[0016]

As described above, according to the present invention, since the bracket supporting the front end of the sub-frame is connected to both the front end of the front side frame and the front bulkhead member, either one of the brackets can be used. It is possible to obtain a higher rigidity than that fixed to the front bulkhead, improving maneuverability and riding comfort, as well as increasing the strength of the front bulkhead, and supporting rigidity of the radiator attached to the front bulkhead. It rises favorably. Also, by connecting between the members necessary for the structure of the vehicle body, a separate member for reinforcement is not required, so that weight reduction can be achieved and the rigidity of the vehicle body can be increased, and the rear bulkhead member can be installed rearward. It is possible to prevent lodging. Further, because of the structure of the front portion of the vehicle body, it is possible to reduce the dead space at the time of a collision and to exert an effect of not adversely affecting the bending mode of the frame.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing a part of a front frame of an automobile to which the present invention is applied.

FIG. 2 is an exploded perspective view showing how to attach a bracket according to the present invention.

[Explanation of symbols]

 1 Front Side Frame 2 Front Damper Support 3 Front Upper Member 4 Front Damper Housing 5 Front Bumper Mounting Member 6 Bulkhead Lower Member 7 Dashboard Lower Member 8 Front Pillar Lower Member 9 Front Pillar Upper Node 10 Front Damper Rear Member 11 Subframe Bracket 11a, 11b Flange part 11c Cylindrical boss part 12 Subframes 12a-12c Support bracket 13 Frame 14 Mounting bolt

Claims (1)

[Claims] 1. An engine having a front side frame provided at a front portion of a vehicle body so as to extend in the front-rear direction, and a front bulkhead member connected to a front end portion of the front side frame in a hanging state. A subframe supporting structure for an automobile, wherein a front end portion of a subframe that supports the subframe is supported by a bracket connected to both the front end portion of the front side frame and the front bulkhead member.