JP3451207B2 - Cross member on body floor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross member extending in the vehicle width direction at a front-rear direction intermediate portion of a vehicle body floor.

[0002]

2. Description of the Related Art Nowadays, the deformability of a passenger compartment of a vehicle tends to be important not only for the load at the time of a frontal collision but also for the load at the sideward collision.

On the other hand, in order to meet the demand for further weight reduction of the vehicle body, the vehicle body structure made of an aluminum alloy material has been increasingly put into practical use.

[0004]

However, spot welding of an aluminum alloy material is not easy. Therefore, if an attempt is made to manufacture a highly rigid car body using an aluminum alloy material by following the welded structure of a steel plate, the manufacturing cost will rise sharply. It was inevitable.

The present invention has been devised to solve the above-mentioned problems of the prior art, and its main purpose is to:
It is an object of the present invention to provide a body floor cross member made of an aluminum alloy, which is configured to have sufficient rigidity to suppress deformation of a living room portion at the time of a side collision without causing a rise in manufacturing cost.

[0006]

In order to achieve such an object, in the present invention , the lower side is opened with both ends thereof joined to the left and right side sills 5 at the front-rear direction intermediate portion of the vehicle body floor . A cross member 3 extending in a direction intersecting with the floor tunnel 6 is formed so as to extend downward from either a first portion 3a having a cross-section that is perpendicular to the longitudinal direction and has a day shape or a front or rear wall of the first portion. And an apron-shaped second portion 3b that is extended to the outside , and is provided with a notch 11 that matches the contours of the outer surface and the upper surface of the floor tunnel in the second portion. The bottom surface 12 of the first portion is joined to the top surface 6a of the floor tunnel, and the end surface of the closed section C2 of the first portion is joined to the inner side surface of the side sill. By doing so, the closed cross section passes through the entire length in the vehicle width direction, so that the buckling rigidity of the cross member extending across the floor tunnel does not complicate the manufacturing process. Can be increased to In particular, slide guide means (T slot 14 in the embodiment) is provided on the upper surface of the bottom wall of the first portion, and the fastener member for attaching the accessory member (T nut 1 in the embodiment) is provided in the slide guide means.
If 5) is slid, the auxiliary member (the support bracket 20 of the Bowden cable for the hand brake or the fixing band 18 of the fuel tank in the embodiment) can be attached to any position of the cross member.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 shows an entire vehicle body lower frame to which the present invention is applied. This frame is configured by welding various members made of aluminum alloy to each other, and has a pair of left and right front side frames 2 that are connected to the dashboard lower cross member 1 at their rear ends and extend forward. And a pair of left and right rear side frames 4 which are connected to the rear cross member 3 at their front ends and extend rearward, and 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 left and right extended side sills 5, a floor tunnel 6 extending in the front-rear direction so as to connect central portions of the dashboard lower cross member 1 and the rear cross member 3, and an intermediate portion in the front-rear direction of the living room. The middle cross member 7 that connects the left and right side sills 5 and the front side of the dashboard lower cross member 1 The side beams 5 and the floor beams 8 are connected to each other, and a pair of floor beams 8 are arranged in a C shape with an open rear side so as to connect the connection portion of the frame 2 and the side end of the rear cross member 3. Therefore, a seat rail bracket 9 provided at the rear of the middle cross member 7 and an outrigger 10 provided at a connecting portion of the rear cross member 3, the rear side frame 4, the side sill 5, and the floor beam 8 are provided.

Each of these members is made of an extruded hollow material except that the dashboard lower cross member 1, the seat rail bracket 9, and the outrigger 10 are die cast. .

Although not shown in FIG. 1, a floor plate formed by press-molding an aluminum alloy plate is stretched over the living room and the luggage compartment.

As shown in FIG. 2, the rear cross member 3 connected to the rear end of the floor tunnel 6 whose bottom is opened has two closed cross-section portions C1.
The first part 3 which forms the letter of the sun, where C2 is piled up and down
a, an apron-shaped second portion 3b extending downward from the front wall of the first portion 3a and having a lower edge portion extending forward, and from the top of the first portion 3a to the rear. It is formed of an extruded material of aluminum alloy so as to have the extended eaves-shaped portion 3c.

At the center of the second portion 3b of the rear cross member 3, as shown in FIGS. 3 and 4, there is formed a notch 11 conforming to the contours of the outer surface and the upper surface of the floor tunnel 6, The lower surface of the bottom wall 12 corresponding to the fourth stroke of the Japanese letter in the first portion 3a is a top surface of the rear end portion of the floor tunnel 6 in which the top surface 6a having a flat cross section perpendicular to the longitudinal direction has a mountain shape. 6a is abutted. The center portion of the rear cross member 3 is joined to the rear end portion of the floor tunnel 6 by fillet-welding the mutual contact portions.

Both end portions of the rear cross member 3 are curved rearward, and upper portions of the two closed cross-section portions C1 and C2 of the first portion 3a from the intermediate partition wall 13 are cut off. The end of the lower closed cross section C2 and the second portion 3b is fillet welded to the inner surface of the side sill 5. As a result, the left and right side sills 5 are connected by the rear cross member 3 in which the hollow closed cross section C2 is continuous over the entire length in the vehicle width direction.

A T-slot 14 as shown in FIG. 2 is formed on the upper surface of the bottom wall 12 of the first portion 3a of the rear cross member 3, and this is shown in FIGS. 5 and 6 together. A rectangular widened portion 15a formed at the end of the T-nut 15 is engageable. By forming U-shaped cut-and-raised portions 16 that can be engaged with the left and right ends of the expanded portion 15a at arbitrary positions on the bottom wall 12, the T-nut 15
Can be positioned. T-nut 15
Engages with the T-slot 14 with the rectangular expansion portion 15a, so that, for example, a band 18 (see FIG. 2) for fixing the fuel tank 17 and a bracket for supporting the Bowden cable 19 for handbrake. A bolt 21 such as 20 (see FIG. 7) for fixing an accessory member is not rotated when tightened into the female screw hole 15b of the T nut 15.

It should be noted that the T nuts 15 can be provided in arbitrary positions in the T slot 14 and in an arbitrary number. For example, in the present embodiment, the T nuts 15 are arranged symmetrically at the left and right sides.
It is provided at each position, the inside is used for the support bracket 20 of the Bowden cable 19 for the hand brake, and the outside is used for the fixing band 18 of the fuel tank 17, but it is not limited to this.

[0016]

As described above, according to the present invention, since a cross member having high rigidity can be obtained relatively easily, the deformation of the living room portion due to a side collision can be suppressed without increasing the manufacturing cost. The effect is obtained. Further, a slide guide means such as a T slot is provided on the upper surface of the bottom wall of the first portion,
If a fastener member such as a T-nut is slidably fitted to the slide guide means, the fastener member can be easily provided within the closed cross section, and therefore the strength of the cross member is not lowered and the cross member is placed at an arbitrary position. An accessory member can be attached.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view of a rear cross member.

FIG. 3 is a perspective view in which a connection portion between a floor tunnel and a rear cross member is partially removed.

FIG. 4 is a front view showing a state where a lower frame of the vehicle body is cut in front of a rear cross member.

5 is a cross-sectional view of the main part taken along the line VV in FIG.

6 is a cross-sectional view of the main part taken along the line VI-VI in FIG.

FIG. 7 is a vertical sectional view of a rear cross member showing another embodiment.

[Explanation of symbols]

3 rear cross members 3a First part 3b Second part 5 side sills 6 floor tunnel 6a Top surface 11 Notch 12 Bottom 14 T slots 15 T nut 18 bands 20 bracket C2 closed section

Claims (2)

(57) [Claims] 1. The lower part of the vehicle body floor is opened with its both ends joined to the left and right side sills at the front-rear direction intermediate part.
A cross member extending in a direction intersecting with the floor tunnel, the first portion having a cross-section that is perpendicular to the longitudinal direction and having a day shape, and downward from any one of the front and rear walls of the first portion. A second portion extending in the shape of an apron, and a cutout portion formed on the second portion in accordance with the contours of the outer surface and the upper surface of the floor tunnel, and the second portion. A cross member for a vehicle body floor, wherein a bottom wall lower surface of the first portion is joined to an upper surface of the floor tunnel, and an end surface of a closed cross-section portion of the first portion is joined to an inner side surface of the side sill. 2. A slide guide means is provided on an upper surface of a bottom wall of the first portion, and a fastener member for mounting an accessory member is slidably fitted to the slide guide means. Body floor cross member.