JP2001247057A - Vehicular body lower part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strengthen rigidity of a vehicular body lower part structure having a skeleton by serially connecting front side members, locker rails and rear side members. SOLUTION: In this vehicular car body lower part structure that rear parts 11 of left and right front side members 1A, 1B of a car body are bent to the oblique rear car outside, the rear ends are joined to a car inside side wall 21 of front parts of left and right locker rails 2A, 2B, front parts 30 of left and right rear side members 3A, 3B are bent to the oblique front car outside, and the front ends are joined to the car inside side wall 21 of rear parts of the left and right locker rails 2A, 2B, extension parts 13 for forming a closed cross section along the car inside side wall 21 of the left and right locker rails 2A, 2B by extending backward, are arranged in the left and right front side members 1A, 1B, and the rear ends of the extension parts 13 are joined to the front ends of the rear side members 3A, 3B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower body structure having a skeleton in which a front side member, a rocker rail, and a rear side member are connected in series.

[0002]

2. Description of the Related Art Conventionally, in a lower body structure of a vehicle, as shown in FIG.
B rear portions 11 are bent obliquely rearward and outward, respectively.
The rear ends are connected to the inner side walls at the front of the left and right rocker rails 2A and 2B, respectively.
A, 2B are coupled to the front end of the left and right rear side members 3A, 3B at the rear side of the inside of the vehicle so that the collision load acting on the front side members 1A, 1B at the time of a frontal collision of the vehicle is reduced by the rocker rails 2A, 2B and the rear side member 3A. , 3B
There is a structure that receives it.

The rear part 1 of the front side members 1A, 1B
Reference numeral 1 denotes a closed section along the lower surface of the floor panel 4, and a rear end thereof is connected to a front side of the inside of the vehicle at each of the rocker rails 2 </ b> A and 2 </ b> B provided along lower left and right side edges of the floor panel 4. I have. Torque boxes 6A, 6B are provided between the bent portions 12 of the front side members 1A, 1B and the front ends of the rocker rails 2A, 2B. Rear side member 3A,
3B has a closed cross section along the lower surface of the luggage compartment floor 4A provided at the rear of the floor panel 4, and the front portion 30 is bent obliquely to the outside of the vehicle, and the front end is formed on the inner side wall at the rear end of the rocker rails 2A and 2B. Are combined.

A plurality of cross members 7 are provided between the rocker rails 2A and 2B along the lower surface of the floor panel 4 in the vehicle width direction.
a and 7b, and a plurality of cross members 8a and 8b are provided between the rear side members 3A and 3B in the vehicle width direction along the lower surface of the luggage compartment floor 4A. Further, a floor cross member 40 is provided on the upper surface of the floor panel 4 along the upper surface of the floor panel 4 over the entire width of the vehicle width direction panel at the rear end positions of the front side members 1A and 1B to reinforce the floor panel 4.

[0005]

By the way, the body rigidity of a vehicle provided with a skeleton for connecting the front side members 1A, 1B, the rocker rails 2A, 2B and the rear side members 3A, 3B over substantially the entire length of the vehicle body, especially The rigidity at the time of the vehicle front offset collision largely depends on the rigidity of the rocker rails 2A and 2B constituting the center of the skeleton. Therefore, it has been considered to increase the thickness of the entire members constituting the rocker rails 2A and 2B to enhance the rigidity of the rocker rails 2A and 2B. However,
If the thickness of the rocker rails 2A and 2B is increased, the weight of the vehicle body increases.
A and 2B are also difficult to form. Therefore, an object of the present invention is to improve the rigidity of the rocker rail and increase the rigidity of the vehicle body without increasing the thickness of the rocker rail.

[0006]

According to the present invention, the rear portions of the left and right front side members of the vehicle body are bent obliquely rearward to the outside of the vehicle, and the rear ends thereof are joined to the front inner side walls of the left and right rocker rails. In the vehicle body lower part structure in which the front portions of the left and right rear side members are bent obliquely forward to the outside of the vehicle and the front ends are connected to the inner side walls at the rear portions of the left and right rocker rails, the left and right front side members are provided with An extension extending rearward and forming a closed cross section integral with the rocker rail is provided along the inner side wall of the left and right rocker rails, and a rear end of the extension is coupled to the front end of the left and right rear side members ( Claim 1). The rigidity of the rocker rail is enhanced by forming the extension of the front side member integrally with the rocker rail. In addition, at the time of a frontal collision, the transmission of the collision load from the front side member to the rear side member is smoothly performed, and the concentration of stress in the transmission path is reduced.

The extension of the front side member forms a closed cross section with the side wall and the floor panel on the vehicle interior side of the rocker rail. The extension can be configured with a closed cross section using existing members.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Front side members 1A and 1B and rocker rails 2A and 2
B and a skeleton formed by connecting the rear side members 3A and 3B in series. The skeleton is formed bilaterally symmetrically. Hereinafter, description will be made focusing on one skeleton on the side of the front side member 1A.

The front side member 1A has a main body 10 on the engine room side and a rear portion 11 extending below the floor of the passenger compartment.
And are connected. As shown in FIGS. 2 and 3, the main body 10 has a closed cross-sectional structure including an inner panel 101 having a substantially U-shaped cross section that opens to the outside of the vehicle, and a flat outer panel 102 that closes the opening of the inner panel 101.

The rear end of the main body 10 is bent obliquely downward,
The rear part 11 is connected. The rear part 11 has a substantially inverted hat shape in cross section that opens upward, and the main body part 1 is provided at the front end thereof.
0 is fitted and welded. The rear part 11 is inclined downward along the inclination direction of the rear end of the main body part 10, and extends horizontally and obliquely rearward and outward through the bent part 12.

The rear end of the rear portion 11 faces a side wall (rocker inner panel) 21 on the vehicle interior side of the rocker rail 2A, and an extended portion 13 extending rearward from the rear end along the rocker rail 2A is formed in a series. The extension portion 13 has a substantially L-shaped cross section obtained by extending the inner side wall 111 and the bottom wall 112 of the rear portion 11 rearward, and the rear end of the extension portion 13 extends substantially to the rear end of the rocker rail 2A. Front side member 1A
The rocker rail 2A
Flange 130 to be superimposed on the side wall 21 inside the vehicle
Is provided.

The rocker rail 2A is a linear elongated body having substantially the same cross-sectional shape as a whole, and a rocker inner panel 21 having a substantially U-shaped cross section opening to the outside of the vehicle, and a rocker having a substantially U-shaped cross section opening to the inside of the vehicle. The outer panel 22 has a closed cross-sectional structure in which the openings are opposed to each other, and the upper and lower edges of the openings 21 and 22 are joined together by welding. Further, inside each rocker rail 2A, an upper edge and a lower edge are integrally connected to a joint portion of an upper edge and a lower edge of the rocker inner panel 21 and the rocker outer panel 22, so that the closed cross section of the rocker rail 2A is left and right. A vertical wall-shaped rocker reinforcement 23 is internally provided.

The front side member 1A is joined to the rocker rail 2A by superimposing and welding the connecting flange 130 of the rear end and the extension portion 13 to the inner side wall 21 from the front to the rear of the rocker rail 2A. It is. In addition,
The bent portion 12 of the front side member 1A and the front end of the rocker rail 2A are connected via a torque box 6A.

As shown in FIGS. 1 and 4, the rear side member 3 is provided on the rear end of the extension 13 of the front side member 1A and on the inner side wall 21 at the rear of the rocker rail 2A.
The front end of A is connected. The rear side member 3A has a substantially inverted hat shape in cross section, and the front portion 30 is slightly bent diagonally forward to the outside of the vehicle. At the front end of the rear side member 3A,
The outer side wall 302 has its front portion cut away to be shorter than the inner side wall 301 and the bottom wall 303. The front end of the outer side wall 302 is overlapped with the inner side wall 21 at the rear of the rocker rail 2A. Have been welded.

On the other hand, the front end of the inner side wall 301 and the front end of the bottom wall 303 protruding forward from the outer side wall 302 are respectively connected to the extension 13 of the front side member 1A.
Are welded to the rear end of the side wall 111 and the rear end of the bottom wall 112 by polymerization welding. In FIG. 4, reference numeral 9 shown by a two-dot chain line is a quarter pillar, which is connected to the terminal after the rocker rail 2A.

As shown in FIGS. 1 and 3, between the skeleton on the side of the front side member 1A and the skeleton on the side of the front side member 1B, the extensions 13 of the front side members 1A, 1B are provided. A plurality of cross members 7a and 7b are provided between the intermediate portion and the rear portion in the vehicle width direction. The cross members 7a and 7b are substantially hat-shaped in cross section, and are formed with connecting flanges 7 formed on the side edges of the front wall and the rear wall.
11 is overlap-welded to the side wall 111 of the extension 13 and a connection flange 721 formed on the side edge of the bottom wall is overlap-welded to the bottom wall 112 of the extension 13 (FIG. 3).
Shows only the cross member 7a). A plurality of cross members 8a and 8b are provided between the rear side members 3A and 3B in the vehicle width direction.

The floor panel 4 has both side edges 41 welded to the upper surfaces of the left and right rocker rails 2A and 2B, and is laid so as to straddle the two rocker rails 2A and 2B. A front side member 1 is provided on the lower surface on both sides of the floor panel 4.
Upper edge flange 11 of side wall 111 of extension 13 of A, 1B
3 are welded together, so that the extension 13 extends along the vehicle interior of each rocker rail 2A, 2B.
A closed section is constituted by the side walls 21 on the inside of the vehicle and the floor panel 4 of A and 2B. The rear part of the rear part 11 is welded to the lower surface of the floor panel 4 extending to the middle bent part 12 of the rear part 11 of the front side members 1A and 1B. Form a closed section.

Further, the torque boxes 6A, 6B and the cross members 7a, 7b are also connected along the lower surface of the floor panel 4 to form a closed section with the floor panel 4. On the upper surface of the floor panel 4, a floor cross member 40 extends over the entire width of the vehicle width direction panel at a position corresponding to a position between the rear ends of the front side members 1A and 1B. The floor cross member 40 has a substantially hat-shaped cross section, and forms a closed cross section along the upper surface of the floor panel 4.

A dash panel 5 is provided at the front end of the cabin to separate the cabin from the engine room. The lower end of the dash panel 5 is inclined downward and rearward to form a rear portion 11 of the front side members 1A and 1B. It is connected to the first half.

On the left and right rear side members 3A, 3B, a luggage compartment floor 4A straddling the left and right rear side members 3A, 3B is laid, and the respective rear side members 3A, 3B and the respective cross members 8a, 8b are provided.
Has a closed section with the cargo floor 4A.

In the event of a frontal collision of the vehicle, particularly when the front side member 1A collides in an offset frontal collision, the collision load acting on the front side member 1A is integrated with the extension 13 of the front side member 1A from the front side member 1A. Is transmitted to the rear side member 3A via the rocker rail 2A. In this case, rocker rail 2
A forms a large closed cross section that is integral with and partitioned from the extension portion 13 of the front side member 1A and has a triple closed cross section structure, so that it exhibits high rigidity against a collision load. In particular, the center axis of the closed section formed by the rocker rail 2A and the extension 13 provided inside the vehicle is the rocker rail 2A.
To the inside of the car from the center axis of the front side member 1
Since the offset amount with respect to A is small, the transmission of the collision load is smoothly performed, the concentration of the stress generated in the transmission path is reduced, and the rigidity against the collision load is effectively enhanced. The rocker rail 2A exhibits high rigidity not only at the time of a frontal collision but also at the time of a side collision.

[0022]

According to the present invention, the front side member is extended rearward without increasing the thickness of the rocker rail, the extension is integrated with the rocker rail, and the rear end of the extension is connected to the rear side member. Only with the front end of
The rigidity of the vehicle body skeleton following the front side member to the rear side member against a frontal collision can be effectively improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a vehicle body lower structure of the present invention.

FIG. 2 is a perspective view of a main part of the vehicle body lower structure.

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

FIG. 4 is a perspective view of another main part of the vehicle body lower structure.

FIG. 5 is a schematic plan view of a conventional body lower structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B Front side member 11 Rear part 12 Bending part 13 Extension part 2A, 2B Rocker rail 21 Inner side wall 3A, 3B Rear side member 30 Front part 4 Floor panel

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Koji Mori, Inventor 395-1, Kaminoda, Kokubu-shi, Kagoshima F-term in Toyota Auto Body Research Laboratories Co., Ltd. 3D003 AA01 BB01 CA09 CA17 CA18 CA48

Claims (2)

[Claims] 1. The vehicle according to claim 1, wherein the rear portions of the left and right front side members of the vehicle body are bent obliquely rearward to the outside of the vehicle, and the rear ends are joined to the front inner side walls of the left and right rocker rails. In a lower body structure of a vehicle in which a front end is connected to an inner side wall at the rear of the left and right rocker rails by bending diagonally forward to the outside of the vehicle, the left and right front side members extend rearward from the rear end to the left and right rocker rails. A vehicle body lower part provided with an extension part which forms a closed cross section integral with the rocker rail along a side wall on the vehicle inner side, and a rear end of the extension part connected to the front ends of left and right rear side members. Construction. 2. An extension of the front side member,
The vehicle body lower part structure according to claim 1, wherein a closed cross section is constituted by a side wall and a floor panel on the vehicle inner side of the rocker rail.