JP3125545B2 - Car body structure - Google Patents

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 FIG. 1, reference numeral 1 denotes a side member, and the side member 1 is joined to lower surfaces of both sides of the floor panel 2.

A front end portion of the side member 1 rises along a dash lower panel 3 which is joined to a front edge of the floor panel 2 and separates the engine room from the vehicle compartment. It is arranged as a front side member 4 at a higher position.

[0004] Side member 1 and front side member 4
As shown in FIG. 8, a side sill 7 is joined to a rising portion 5 which is a joining portion between the side sill 7 and an outrigger 6.

The front end of the side member 1 extends to the base of the front side member 4, and a chassis member 8 is provided below the side member 1 with bolts 9,
10 and a bracket 11 (this similar structure is described in, for example, Nissan Motor Co., Ltd.
On page 5).

[0006]

In the event of a frontal collision of a vehicle, the load input from the front end of the front side member 4 can be supported by the outrigger 6 at the beginning of the collision. When the chassis member 8 retreats with the bottom, 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. There is a problem that a large moment M acts to cause displacement of the dash lower panel 3 into the vehicle interior.

Accordingly, the present invention is to provide a vehicle body structure which can further enhance the safety at the time of a vehicle frontal collision.

[0008]

A front end portion of a side member attached to a lower surface of a floor panel is formed upright along a dash lower panel separating an engine room and a vehicle compartment, and a front side portion is formed in the engine room. A chassis member is attached via a bracket to a lower part of the front side member in front of the rising portion, a side sill is joined to an outer wall of the rising portion via an outrigger, and a lower wall of the outrigger is extended as a member. Are set behind the rear end of the chassis member and within the width in the height direction.

[0009] Further, a bulkhead may be provided in a rising portion of the side member and along a vertical wall of an outrigger attached to an 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.

The brace preferably has a rear end flange connected to the lower surface of the floor panel or the lower wall of the side member.

[0011]

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

In addition, by providing a 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 the brace is provided in the side member at a position along the lower wall of the outrigger, the rear end flange 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 shared between the lower surface of the floor panel and the lower wall of the side member.

[0014]

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. The side member 12 is a hat-shaped cross-sectional member having an open upper part, and is joined to the lower surface of the floor panel 13 by an upper edge flange portion 12a. The above side member 1
As shown in FIG. 4, the front end of the vehicle 2 rises along a dash lower panel 14 that separates the engine room and the vehicle compartment. It extends as a side member 16.

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

The front side member 16 has 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. The rear end portion has a U-shaped cross section opened upward and is joined to the side member 12. A reinforcement 17 is joined to the front side member 16 over the outer side surface of the vertical wall and the lower wall, and the lower wall 17 b of the reinforcement 17 is connected to the front side member 16 and the bottom wall 15 a of the rising portion 15. Part.

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

As shown in FIGS. 2 and 4, a chassis member 20 is attached to a lower portion of a front portion of the rising portion 15 of the front side member 16 via a bracket 19. Specifically, the chassis member 20 is a member having a U-shaped cross section that is open outward, and a bolt 21 that penetrates the bottom wall of the bracket 19 is connected to the 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 front end of the bolt 21, and the rear end of the plate bracket 22 is fixed to the bottom wall 15 a at the front end of the rising portion 15 by a pair of bolts 23.

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

The outrigger 24 is a member having an upper portion that is open and has a substantially L-shape in side view and has a closed cross-sectional structure formed by a dash lower panel 14, and has a vertical wall 24a that is inclined in a direction crossing the rising portion 15 up and down. The lower portion is provided with a lower wall 24b that fits behind the rear end of the chassis member 20 and within the width D in the height direction (between the upper wall 20a and the lower wall 20b) along the bottom wall 15a of the rising portion 15. The closing plate 1 is provided (shown in FIG. 2) by an inner flange portion 25a provided on the inner edge of the vertical wall 24a and the lower wall 24b.
8 and is joined to the side sill S by an outer flange portion 26a provided on the outer edges of the vertical wall 24a and the lower wall 24b.

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

Here, a bulkhead 28 is mounted inside 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 reinforce 17. , And a hole 28d for reducing the weight is provided in the center of the bulkhead 28.

On the other hand, as shown in FIG. 3, a brace 29 is provided at a position extending from the rising portion 15 to the front end of the side member 12 along a lower wall 24b of the outrigger 24, and the brace 29 is formed by a front flange portion. 29a is joined to the bottom wall 15a of the rising portion 15, and the rear flange portion 29
b is joined to the lower surface of the floor panel 13. 1 and 2, the brace 29 is omitted in FIGS.

According to the structure of the above embodiment, when a large input load acts upon a frontal collision of the vehicle and the chassis member 20 moves rearward , the lower wall 24b of the outrigger 24 is positioned behind the rear end of the chassis member 20 and within the height direction width. Is set, the input load from the chassis member 20 can be applied to the side sill S and the side member 12 via the lower wall 24b of the outrigger 24 as an axial crushing input , and a stable reaction force can be obtained. That is, unlike the related art, the rear portion of the chassis member 20 is locally deformed to generate no moment, and the side sill S and the front end of the side member 12 are crushed to reliably absorb energy.

Further, the bulkhead 28 is
Is provided at a position along the vertical wall 24a of the outrigger 24, thereby preventing the rising portion 15 of the front side member 16 from collapsing from the side at the time of a vehicle side collision and reducing the input load acting from the outrigger 24. Launcher 15
And the strength and rigidity can be increased.

The brace 29 is provided at a position extending from the rising portion 15 to the front end of the side member 12 and along the lower wall 24b of the outrigger 24. 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 applied to 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. This embodiment is different from the first embodiment in that the mounting position of the brace 29 is different. The front flange portion 29a of the brace 29 is the bottom wall 1 of the rising portion 15.
5a, but the rear flange portion 29b is joined to the bottom wall of the side member 12. Therefore, in this embodiment, there is an advantage that the input load applied to the front side member 16 during the frontal collision of the vehicle can be reliably applied to the side member 12 from the rising portion 15. In the second embodiment, the other constructions and operations are the same as those of the first embodiment.

[0029]

According to the invention described, according to the present invention according to claim 1, the vehicle front a large input load acting during a collision, even if Shashimenba moves backward, side sills and side input load by Shashimenba through the lower wall of the outrigger The member can be made to act as an axial crush 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 vehicle side collision, 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, it is possible to prevent the rising portion from collapsing from the side at the time of a vehicle side collision as well as the bulkhead and input from the front acting on the chassis member at the time of a vehicle frontal collision. The load can act as the axial crush load of the side member.

According to the invention described in claim 4, the rearward input load acting upon a frontal collision of the vehicle can be efficiently transmitted from the rising portion to the floor panel by the brace.

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

[Brief description of the 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.

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

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

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

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

FIG. 8 is an explanatory front view of a conventional technique.

[Explanation of symbols]

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

Continuation of the front page (56) References JP-A-4-50084 (JP, A) JP-A-64-47683 (JP, A) JP-A-1-237269 (JP, A) JP-A-6-144297 (JP, A) , A) JP-A-1-275277 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (5)

(57) [Claims] 1. 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 dash lower panel separating an engine room and a vehicle compartment, and extends as a front side member in the engine room. And
A chassis member is attached to a 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 connected to a lower wall of the chassis member.
A body structure of an automobile, which is set behind the rear end and within a width in a height direction. 2. A bulkhead is provided in a rising portion of the side member and 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 along a lower wall of the outrigger. 4. A vehicle body structure according to claim 3, wherein a rear end flange portion of said brace is connected to a lower surface of the floor panel. 5. The vehicle body structure according to claim 3, wherein a rear end flange portion of the brace is connected to a lower wall of the side member.