JPH11227639A - Body frame structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten the flexural stiffness of a coupling part of a center pillar with a side sill without causing a large size of side sill. SOLUTION: On the inner side of a side sill 5, the rear end of a front side frame is coupled with the side end of a rear cross-member by a hollow beam 8 formed through an extrusion process from a light metal, and a part of side sill 5 near the center pillar coupling part is coupled with the hollow beam 8 by a seat rail bracket 9 formed by die-casting. Thereby the load applied to the center pillar is borne by both the side sill 5 and hollow beam 8, so that it is possible to reduce the section area of the side sill 5. Because of coupling of the sill 5 with beam 8 by seat rail bracket 9, there is no need to provide any particular high-stiffness member as a coupling member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body frame structure formed of a light metal material such as an aluminum alloy.

[0002]

In order to protect the occupant from a side collision, it is necessary to prevent the center pillar from digging into the living room due to the collision load. For that purpose, it is necessary to increase the bending rigidity of the connecting portion between the center pillar and the side sill. However, it is customary that the cross-sectional area of the side sill is large to some extent, and there is one aspect that the getting on and off is sacrificed.

[0003] The present invention has been devised in order to improve such disadvantages of the prior art, and its main object is to increase the bending rigidity of the connecting portion between the center pillar and the side sill by increasing the size of the side sill. It is an object of the present invention to provide a vehicle body frame structure that is configured to be able to be raised without inducing.

[0004]

According to the present invention, a light metal material is provided between the rear end of the front side frame 2 and the side end of the rear cross member 3 inside the side sill 5. In addition to connecting the hollow beam 8 extruded with the hollow beam 8, the vicinity of the center pillar connection portion of the side sill and the hollow beam are connected by the die-cast molded seat rail bracket 9. According to this, since the load applied to the center pillar 18 can be received by both the side sill and the hollow beam, the cross-sectional area of the side sill can be reduced. Further, since the side sill and the hollow beam are connected by the seat rail bracket, it is not necessary to provide a special high-rigidity member as a connecting member.

[0005]

FIG. 1 shows an entire body lower frame to which the present invention is applied. This frame is assembled by welding and joining various members made of an aluminum alloy to each other, and a pair of front side frames 2 extending forward with their rear ends joined to the dashboard lower cross member 1. And a pair of rear side frames 4 whose front ends are connected to the rear cross member 3 and extended rearward, and are connected in the front-rear direction so as to connect between both side ends of the dashboard lower cross member 1 and the rear cross member 3. A pair of extended side sills 5, a floor tunnel 6 connecting central portions of the dashboard lower cross member 2 and the rear cross member 3 to each other, and a left side sill 5 connected to an intermediate portion of the living room in the front-rear direction. Between the middle cross member 7 provided on the front side frame 2 of the dashboard lower cross member 1 So as to connect between the side ends of the rear cross member 3, the rear side and a pair of floor beams 8 arranged in Ha-shape open.

Each of these members is formed of a hollow material formed by extrusion molding, except that the dashboard lower cross member 1 is formed by die casting.

Although not shown in FIG. 1, a floor plate formed by press-molding an aluminum alloy plate is attached to the living room and the cargo room.

[0008] A seat rail bracket 9 for supporting a rear end of a seat rail (not shown) is fixed behind the middle cross member 7.

An outrigger 10 formed by die-casting is fixed to a connection portion of the rear cross member 3, the side sill 5, and the floor beam 8 to support a rear suspension arm.

As shown in FIGS. 2 and 3, the seat rail bracket 9 is joined to the inner surface of the side sill 5 by welding or the like so as to connect between the center pillar connecting portion of the side sill 5 and the floor beam 8. And a gusset portion 13 connecting the two surfaces to each other by welding or the like to the upper surface of the floor plate F stretched on the floor beam 8, and die-casting an aluminum alloy. It is integrally formed by molding.

The gusset portion 13 has a box-like shape whose inner surface is connected by a plurality of ribs 14 in order to obtain high rigidity. A mounting portion 15 on which the rear end of the seat rail is mounted is provided on the inclined upper surface. Is provided, and the mount portion 15 includes
Female screw hole 1 for screwing the seat rail fixing bolt
A boss 17 provided with 6 is provided.

As described above, the two members (the side sill 5 and the floor beam 8) extending in the front-rear direction are connected in the width direction via the highly rigid member (the seat rail bracket 9) near the center pillar 18. Accordingly, the load applied to the center pillar 18 can be received by both the side sill 5 and the floor beam 8.
The center pillar 18 can be provided without deteriorating the getting on / off property by the side sill having a large cross section and without significantly increasing the manufacturing cost by providing a special high-rigidity member as a reinforcing material. Bending stiffness of the connecting portion between the shaft and the side sill 5 can be increased.

[0013]

As described above, according to the present invention, the bending rigidity of the connecting portion between the center pillar and the side sill can be increased without increasing the size of the side sill and significantly increasing the manufacturing cost.
A great effect can be achieved in suppressing the influence of the deformation of the center pillar due to the side collision on the living room.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a vehicle body lower frame.

FIG. 2 is a partial cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged perspective view of an application site of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dashboard lower cross member 2 Front side frame 3 Rear cross member 4 Rear side frame 5 Side sill 6 Floor tunnel 7 Middle cross member 8 Floor beam 9 Seat rail bracket 10 Outrigger 11 Vertical plane 12 Horizontal plane 13 Gusset part 14 Rib 15 Mounting part 16 Female screw Hole 17 boss 18 center pillar

Claims (1)

[Claims] An inside of a side sill is connected between a rear end of a front side frame and a side end of a rear cross member by a hollow beam extruded with a light metal material.
A body frame structure for an automobile, wherein a portion near a center pillar connecting portion of the side sill and the hollow beam are connected by a die-cast molded seat rail bracket.