JPH07149263A - Car body structure of automobile - Google Patents

Abstract

PURPOSE:To heighten safety at collision time by forming a front side member by rising a front end part of a side member on an under surface of a floor panel along a dash floor panel, installing a chassis member under it, and joining a side sill to an outside wall of a rising part through an outrigger. CONSTITUTION:A front end part of a side member 12 joined to an under surface of a floor panel 13 rises along a dash floor panel 14, and is extendedly arranged as a front side member 16 on the front side from this rising part 15. A chassis member 20 is installed under the front part of this rising part 15 through a bracket 19, and a side sill S is installed through an outrigger 24, and a lower wall 24b of the outrigger 24 is set within a height directional width of the chassis member 20. When the chassis member 20 moves backward at vehicle head on collision time, an input load by the chassis member 20 is made to act on the side member 12 through the lower wall 24b of the outrigger 24, so that stable reaction is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile body structure.

[0002]

2. Description of the Related Art Some automobiles have a vehicle body structure as shown in FIGS. In the figure, reference numeral 1 denotes a side member, and the side member 1 is joined to the lower surfaces of both side portions of the floor panel 2.

The front end portion of the side member 1 is joined to the front edge of the floor panel 2 and rises up along a dash lower panel 3 that separates the engine room from the vehicle compartment. Within the engine room, the side member 1 is disposed. The front side member 4 is arranged at a position higher than the above.

Side member 1 and front side member 4
As shown in FIG. 8, a side sill 7 is joined to the rising portion 5 which is a joined portion of the side sill 7 and the outer sill 6 through the outrigger 6.

The front end portion of the side member 1 extends to the base of the front side member 4, and a chassis member 8 is provided at the bottom of the side member 1 with bolts 9 and 9.
10 and a bracket 11 are attached (this similar structure is, for example, issued by Nissan Motor Co., Ltd. in June 1991, new model car description Cedric Gloria D-1).
(See page 5).

[0006]

In a vehicle frontal collision, the load input from the tip of the front side member 4 can be supported by the outriggers 6 at the beginning of the collision, but the collision progresses and the chassis member 8 acts as a barrier. When the chassis member 8 bottoms out and retracts, the front wall 1a (hatched portion) of the side member 1 facing the rear end of the chassis member 8 is locally deformed and the bent portion 1b of the side member 1 is bent as shown in FIG. However, there is a problem that a large moment M acts to cause displacement of the dash lower panel 3 into the vehicle interior.

Therefore, the present invention provides a vehicle body structure capable of further improving safety in the case of a vehicle frontal collision.

[0008]

[Means for Solving the Problems] A front end portion of a side member attached to a lower surface of a floor panel is formed so as to rise along a Dashroa panel that separates an engine room and a vehicle compartment, and a front side is provided in the engine room. As a member, a chassis member is attached to the lower part of the front side member in front of the rising portion via a bracket, and a side sill is joined to an outer wall of the rising portion via an outrigger, and a lower wall of the outrigger is formed. Is set within the width in the height direction of the chassis member.

A bulkhead may be provided in the rising portion of the side member at a position along the vertical wall of the outrigger attached to the outer wall of the rising portion,
A brace may be provided in the side member at a position along the lower wall of the outrigger.

It is desirable that the brace has its rear end flange portion connected to the lower surface of the floor panel or the lower wall of the side member.

[0011]

In a vehicle frontal collision, the load acting on the front side members is also shared by the side sills via the outriggers. Here, even when the chassis member bottoms out, the chassis member applies a load to the lower wall of the outrigger, and the load is shared by the side sill and the side member, and a stable reaction force can be obtained.

Further, by providing the bulkhead along the vertical wall of the outrigger in the rising portion, it is possible to prevent the side member from being crushed at the time of a side collision and to obtain a stable reaction force.

When a brace is provided in the side member at a position along the lower wall of the outrigger, the rear end flange portion of the brace is connected to the lower surface of the floor panel or the lower wall of the side member. The load acting from the front is distributed to the lower surface of the floor panel or the lower wall of the side member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 12 denotes a side member, which is a member having a hat-shaped cross-section whose upper side is open and which is joined to the lower surface of the floor panel 13 by an upper edge flange portion 12a. Above side member 1
As shown in FIG. 4, the front end portion of 2 rises up along a dash lower panel 14 that separates the engine room from the vehicle compartment, and from this rising portion 15 to the front side in the front engine room to a position higher than the side member 12. It is extended as the side member 16.

Specifically, the rising portion 15 is formed integrally with the front side member 16, and the rear end of the rising portion 15 is joined to the front end of the side member 12.

The front side member 16 is a member having a U-shaped cross-section that opens outward at the front side and an L-shaped cross-section that opens outward at the rising portion 15, and is a member of the rising portion 15. The rear end portion has an open U-shaped cross section and is joined to the side member 12. Further, the reinforcement 17 is joined to the outer surface of the vertical wall of the front side member 16 and the lower wall, and the lower wall 17b of the reinforcement 17 is one of the front side member 16 and the bottom wall 15a of the rising portion 15. It is designed to form a section.

The flange portion 1 is provided on the upper edge of the front side member 16 and the outer edge of the reinforcement 17.
6a and 17a are provided respectively, and the flange portion 16a,
The closing plate 18 is joined to 17a, and the closing plate 18 and the front side member 16 are joined together.
(Including the rising portion 15) and the side member 12 and the floor panel 13 form a continuous closed cross-section structure portion.

A chassis member 20 is attached to the lower part of the front portion of the rising portion 15 of the front side member 16 via a bracket 19 as shown in FIGS. Specifically, the chassis member 20 is a member having a U-shaped cross-section that is opened to the outside, and a bolt 21 that penetrates the bottom wall of the bracket 19 has upper and lower walls 2 at the rear end of the chassis member 20.
The chassis member 20 is supported by penetrating through 0a and 20b. The front end of the plate bracket 22 is attached to the tip of the bolt 21, and the rear end of the plate bracket 22 is fixed to the bottom wall 15a at the front end of the rising portion 15 by a pair of bolts 23.

Here, the rising portion 15 has a closing plate 18 which constitutes an outer side surface thereof, and an outrigger 2 is attached to the closing plate 18.
The side sill S is attached via 4 (see FIG. 5).

The outrigger 24 is a member having a substantially L-shape in a side view and having a closed cross-section structure by the dash lower panel 14, and has a vertical wall 24a inclined upward and downward in a direction crossing the rising portion 15 at the upper portion. Is provided, and the lower portion is located within the width D in the height direction of the rear end of the chassis member 20 (upper wall 20a and lower wall 20a) after the bottom wall 15a of the rising portion 15 is provided.
a bottom wall 24b (shown in FIG. 2) that fits in (b)),
It is joined to the closing plate 18 by the inner flange portion 25a provided on the inner edge of the vertical wall 24a and the lower wall 24b, and is joined to the side sill S by the outer flange portion 26a provided on the outer edge of the vertical wall 24a and the lower wall 24b. ing.

As shown in FIG. 3, an upper flange portion 27a is provided on the upper edge of the vertical wall 24a of the outrigger 24, and the upper flange portion 27a is joined to the dash lower panel 14.

A bulkhead 28 is attached to the inside of the rising portion 15 at a position along the vertical wall 24a of the outrigger 24 to be joined.

As shown in FIG. 1, the bulkhead 28 has an inner flange portion 28a on the inner surface of the rising portion 15, an outer flange portion 28b on the closing plate 18, and a lower flange portion 28c on the lower wall 17b of the reinforcement 17. And a hole 28d for reducing the weight is provided at the center of the bulkhead 28.

On the other hand, as shown in FIG. 3, a brace 29 is provided at a position along the lower wall 24b of the outrigger 24 at a portion extending from the rising portion 15 to the front end portion of the side member 12. The brace 29 has a front flange portion. 29a is joined to the bottom wall 15a of the rising portion 15, and the rear side flange portion 29
b is joined to the lower surface of the floor panel 13. For convenience of illustration, the brace 29 is omitted in FIGS.

According to the structure of the above embodiment, when the chassis member 20 moves rearward due to a large input load during a frontal collision of the vehicle, the lower wall 24b of the outrigger 24 is set within the width of the chassis member 20 in the height direction. Therefore, the input load from the chassis member 20 is applied to the lower wall 24 of the outrigger 24.
The side member 12 can be made to act as a shaft crushing input via b, and a stable reaction force can be obtained. That is, the front portion of the side member 12 is crushed to reliably absorb energy without locally deforming the rear portion of the chassis member 20 to generate a moment as in the conventional case.

In addition, the bulkhead 28 has the rising portion 15
Since it is provided at a position along the vertical wall 24a of the outrigger 24 inside, the crushing from the side of the rising portion 15 of the front side member 16 is prevented and the input load acting from the outrigger 24 is prevented at the time of a side collision of the vehicle. Startup section 15
Can be reliably transmitted, and strength and rigidity can be increased.

A brace 29 is provided at a position extending from the rising portion 15 to the front end portion of the side member 12 and along the lower wall 24b of the outrigger 24, so that the vehicle is similar to the bulkhead 28 in the vehicle. Since the strength and rigidity at the time of a side collision can be increased, the front flange portion 29a of the brace 29 is joined to the bottom wall 15a of the rising portion 15, and the rear flange portion 29b is joined to the lower surface of the floor panel 13, There is an advantage that the input load acting on the front side member 16 at the time of a vehicle front collision can be efficiently transmitted to the floor panel 13.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the mounting position of the brace 29 of the first embodiment described above is different. The front flange portion 29a of the brace 29 is the bottom wall 1 of the rising portion 15.
The rear flange portion 29b is joined to the bottom wall of the side member 12, although it is joined to 5a. Therefore, in this embodiment, there is an advantage that the input load acting on the front side member 16 at the time of a vehicle frontal collision can be reliably applied to the side member 12 from the rising portion 15. Since the other structure and operation of the second embodiment are the same as those of the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

[0029]

According to the invention described in claim 1, even when a large input load is applied at the time of a frontal collision of the vehicle and the chassis member moves rearward, the input load by the chassis member is transmitted to the side member through the lower wall of the outrigger. It can act as a crushing input and a stable reaction force can be obtained.

According to the second aspect of the present invention, it is possible to prevent the rising portion from being crushed from the side at the time of a side collision of the vehicle and to reliably transmit the input load acting on the outrigger to the rising portion. it can.

According to the third aspect of the present invention, like the bulkhead, it is possible to prevent the rising portion from being crushed from the side at the time of a side collision of the vehicle, and at the same time, the input from the front is acted by the chassis member at the time of the front collision of the vehicle. The load can act as a shaft crush load of the side member.

According to the fourth aspect of the present invention, the rearward input load acting at the time of a vehicle frontal collision can be efficiently transmitted to the floor panel from the rising portion by the brace.

According to the fifth aspect of the present invention, the rearward input load acting at the time of the frontal collision of the vehicle can be reliably transmitted from the rising portion to the side member by the brace.

[Brief description of drawings]

FIG. 1 is a front perspective view of a first embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a perspective view seen from the rear side.

FIG. 4 is an explanatory side view of the same.

FIG. 5 is an explanatory view of the same plane.

FIG. 6 is a perspective view corresponding to FIG. 3 of the second embodiment of the present invention.

FIG. 7 is a side cross-sectional explanatory view of a conventional technique.

FIG. 8 is a front cross-sectional explanatory view of a conventional technique.

[Explanation of symbols]

 12 ... Side member 13 ... Floor panel 14 ... Dash lower panel 15 ... Launching part 16 ... Front side member 19 ... Bracket 20 ... Chassis member 24 ... Outrigger 24a ... Vertical wall 24b ... Lower wall 28 ... Bulkhead 29 ... Brace 29a ... Front flange Part 29b ... Rear flange part S ... Side sill D ... Height direction width

Claims (5)

[Claims] 1. A front end portion of a side member attached to a lower surface of a floor panel is formed to rise along a Dashroa panel that separates an engine room and a vehicle compartment, and extends as a front side member in the engine room. Then, a chassis member is attached to the lower portion of the front side member in front of the rising portion via a bracket, a side sill is joined to an outer wall of the rising portion via an outrigger, and a lower wall of the outrigger is attached to the chassis member. A vehicle body structure characterized by being set within a width in a height direction. 2. The bulkhead is provided in the rising portion of the side member at a position along a vertical wall of an outrigger attached to an outer wall of the rising portion. Car body structure. 3. The vehicle body structure according to claim 1, wherein a brace is provided in the side member at a position along the lower wall of the outrigger. 4. The vehicle body structure according to claim 3, wherein a rear end flange portion of the brace is connected to a lower surface of the floor panel. 5. The vehicle body structure according to claim 3, wherein the rear end flange portion of the brace is connected to the lower wall of the side member.