JP2003200857A - Vehicle body floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide vehicle body floor structure capable of effectively using an extension side member as a reinforcing member for a belt anchor input without impairing the strength and rigidity. <P>SOLUTION: A parallel part 6B continuous with an inclined part 6A of the extension side member 6 is joined and arranged along a side part of a floor tunnel 2. A join flange 7 on an inner side in the direction of vehicle width is joined with a longitudinal wall 2a face of the floor tunnel 2 to set a join fixation point to substantially same height as a seat rail fixation point in order to increase the rigidity of a belt anchor input transmission part. Consequently, the strength and rigidity around the floor tunnel from a seat rail fixation part on a central side of a floor can be increased. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a vehicle body floor structure, a floor tunnel bulged upward in the center of the floor panel in the vehicle width direction extends in the front-rear direction, and extension side members are provided on both left and right sides of the bottom surface of the floor panel. The joints are arranged in the front-rear direction.

This extension side member is formed in an inverted hat-shaped cross section, and is arranged on both left and right sides of the front compartment so as to extend in the front-rear direction, and the rear end portion of the side member which constitutes the main energy absorbing member at the time of a frontal collision. Of the extension side members are arranged in a substantially straight line on the rearward extension, and the position of the extension side member is set on the floor side away from the floor tunnel to the outside in the vehicle width direction.

On the other hand, a seat is arranged on the floor panel via a seat rail unit, and this seat rail unit is mounted on the floor panel via front and rear brackets of both the floor center side unit and the floor side unit. The floor center side unit is fastened and fixed above, but the floor center side unit is arranged close to the side portion of the floor tunnel, and a belt anchor of a seat belt is set on the floor center side unit or the seat cushion frame on the floor center side. .

Therefore, since the input to the belt anchor is transmitted to the floor panel via the seat and the seat rail unit on the floor center side, in order to increase the strength of the seat rail unit fixing portion on the floor center side, A tunnel reinforcement is arranged across the left and right sides of the floor tunnel (Japanese Patent Laid-Open No. 2001-2001).
-2119873 and JP-A-8-108862).

[0006]

As described above, since the reinforcing member for the belt anchor of the seat belt is additionally required for the floor tunnel, the number of parts and the number of assembling steps are increased, which is disadvantageous in terms of cost. It is undeniable not only that it will result in a disadvantage in terms of weight.

Therefore, according to the present invention, the extension side member joined and arranged on the lower surface of the floor panel can be effectively used as a reinforcing member for a belt anchor input without deteriorating the strength and rigidity of the floor frame member.
A vehicle body floor structure that is advantageous in terms of cost and weight.

[0008]

According to the invention of claim 1, the front end of the floor panel is connected to the rear ends of the side members extending in the front-rear direction on the left and right sides of the front compartment. An extension side member with an inverted hat-shaped cross section that wraps around and extends in the front-rear direction,
In a floor tunnel that is bulged upward in the vehicle width direction central portion of the floor panel and extends in the front-rear direction, an inclined portion that gradually approaches rearward from the front end of the floor and a rear portion of the inclined portion are formed. And a parallel portion along the side portion of the floor tunnel, and of the pair of left and right joint flanges continuously provided from the inclined portion to the parallel portion, the joint flange on the inner side in the vehicle width direction is formed by the inclined portion. Similar to the joint flange on the outside in the vehicle width direction, it is joined to a substantially horizontal floor panel surface, while at the parallel part, gradually from the front side to the rear side, from the floor panel surface along the vertical wall of the floor tunnel. In the portion that is joined and corresponds to the seat rail fixing portion on the floor panel of the parallel portion, the joining fixing point of the joining flange on the inner side in the vehicle width direction is almost the same as the seat rail fixing point. It is characterized in that setting the height.

According to the second aspect of the present invention, the disposition portion of the parallel portion according to the first aspect is set between the second cross member and the third cross member, which are joined and arranged on the floor panel in the vehicle width direction. Is characterized by.

According to the invention of claim 3, claims 1 and 2 are provided.
In a required portion of the floor panel where the shape gradually changing portion that transitions from the inclined portion to the parallel portion is jointly arranged, an embossed portion that bulges upward is provided, while the shape gradually changing portion that is jointly arranged at the embossed portion It is characterized in that the sectional height is formed higher than that of the general portion.

[0011]

According to the invention described in claim 1, the parallel portion of the extension side member is arranged so as to be joined along the side portion of the floor tunnel, and the joint flange on the inner side in the vehicle width direction of the parallel portion is formed. It has a double wall structure joined to the vertical wall surface of the floor tunnel, and the joint fixing point of the joint flange is set at substantially the same height as the seat rail fixing point to which the belt anchor input is transmitted. Since the rigidity is increased, the parallel portion can increase the strength and rigidity around the floor tunnel from the seat rail fixing portion on the floor center side.

As a result, there is no need for a dedicated reinforcing member for the belt anchor, and there is a cost advantage and a weight advantage of a floor structure that can effectively use the extension side members to sufficiently oppose the belt anchor input. Can be obtained.

Moreover, in the extension side member, the slope gradually changes from the front end of the floor toward the rear to gradually become closer to the side of the floor tunnel to form a parallel part, so that there is no abrupt shape change, that is, no bending point. Due to the structure, the collision load input from the side member side at the time of frontal collision can be received almost linearly by the extension side members and distributed and transmitted to other floor components, and functions as a floor frame member in the front-rear direction. It doesn't hurt even a little.

According to the invention of claim 2, claim 1
In addition to the effect of the invention described above, since the parallel portion is arranged orthogonally to the second cross member and the third cross member, which are the skeleton members in the vehicle width direction of the vehicle body floor, the parallel portion can be changed from the inclined portion of the extension side member. The strength decrease due to the change in shape due to the change in the shape is compensated by these vehicle width direction frame members, and bending rigidity in the vehicle width direction and the up and down direction with respect to the longitudinal load of the extension side member can be secured.

According to the third aspect of the invention, in addition to the effects of the first and second aspects of the invention, the shape gradually changing portion that transitions from the inclined portion to the parallel portion is a cross section with an embossed portion formed on the floor panel. Since the height is formed higher than that of the general portion and the closed cross-sectional area is enlarged in the vertical direction, the strength and rigidity of the gradually changing shape portion against the load in the front-rear direction can be increased.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 5, reference numeral 1 denotes a floor panel, and a floor tunnel 2 extending in the front-rear direction is bulged upward at the center of the vehicle width direction.

On the left and right edges of the floor panel 1, there are sill inners 3 of side sills which are joined to each other and which constitute a front-back skeleton member on the floor side.

Further, on the upper surface of the floor panel 1, a second cross member 4 and a third cross member 5 which constitute a vehicle width direction frame member are arranged in the front and rear direction across the side portion of the floor tunnel 2 and the left and right sill inners 3. The joints are arranged at required intervals in the direction.

Reference numeral 6 denotes a pair of left and right extension side members which are formed in an inverted hat-shaped cross section and which are joined to the lower surface of the floor panel 1 through a joining flange 7 at the upper edge to form a front-back skeleton member. Reference numeral 6 denotes a rear extension of a side member extending in the front-rear direction on the left and right sides of the front compartment (not shown), and the rear end of the suspension member 8 is fastened and supported on the lower surface of the front end of the side member.

The extension side member 6 is
An inclined portion 6A that gradually approaches the floor tunnel 2 from the front end of the floor toward the rear, and a parallel portion 6 that is formed continuously with the rear portion of the inclined portion 6A and extends along the side portion of the floor tunnel 2.
It is composed of B and.

The parallel portion 6B is provided with a shape gradually changing portion 6C which gradually changes in shape from the inclined portion 6A so as to become parallel to the side portion of the floor tunnel 2, and the parallel portion 6B is provided with the second cross member 4. And the third cross member 5, and in the present embodiment, the parallel portion 6B is joined and arranged in the vehicle width direction from the placement portion of the second cross member 4 to the lower surface of the rear end portion of the floor panel 1. The rear seat cross member 9 is joined and arranged so that the shape gradually changing portion 6C extends over the second cross member 4 and the third cross member 5.

Of the pair of left and right joint flanges 7 and 7 which are continuously provided from the inclined portion 6A of the extension side member 6 to the parallel portion 6B, the joint flange 7 on the inner side in the vehicle width direction is the inclined portion. 6A is joined to the substantially horizontal floor panel 1 surface like the joint flange 7 on the outer side in the vehicle width direction, while in the parallel portion 6B, the floor panel 1 surface to the floor tunnel 2 gradually increases from the front side to the rear side thereof.
Are joined along a substantially vertical wall surface 2a.

A seat rail 10 is joined and fixed to the disposition portion of the third cross member 5 through a bracket 11 over the third cross member 5 and the vertical wall 2a of the floor tunnel 2. The formation height of the substantially vertical joint flange 7 on the vertical wall 2a is increased, and the joint fixing point and the joint fixing point of the bracket 11 are set to substantially the same height.

Further, the shape gradually changing portion 6 of the floor panel 1
An embossed portion 1A which bulges upward is provided at a portion where C is joined and arranged, and the shape gradually changing portion 6C joined and arranged at the embossed portion 1A has a cross-section height of a general portion, that is, an inclined portion 6A. , Is formed higher than the parallel portion 6B.

In this embodiment, the embossed portion 1A is formed so that the depth gradually increases from the rear end portion of the second cross member 4 to the front end portion of the third cross member 5, and therefore the shape gradually changing portion is formed. The cross-sectional height of 6C is adjusted to gradually increase from the front side to the rear side in accordance with the change in depth of the embossed portion 1A.

According to the structure of the above embodiment, the parallel portion 6
B is joined and arranged along the side portion of the floor tunnel 2 including the shape gradually changing portion 6C on the front side thereof, and the joint flange 7 on the inner side in the vehicle width direction of the parallel portion 6B is attached to the vertical wall 2a of the floor tunnel 2. It has a double wall structure joined to the surface, and the joint fixing point of the joint flange 7 is set at substantially the same height as the seat rail fixing point for transmitting the belt anchor input to enhance the rigidity of the input transmitting portion. Therefore, the parallel portion 6
By B, the strength and rigidity around the floor tunnel 2 can be increased from the seat rail fixing portion on the center side of the floor.

As a result, there is no need for a dedicated reinforcing member for the belt anchor, and the floor structure that can effectively use the extension side member 6 to sufficiently oppose the belt anchor input is provided in terms of cost and weight. It can be obtained advantageously.

Moreover, in the extension side member 6, the inclined portion 6A gradually changes from the front end of the floor toward the rear to gradually change to the parallel portion 6B near the side portion of the floor tunnel 2, and thus the shape of the extension side member 6 changes rapidly. Since the structure has no bending point, the collision load input from the side member side at the time of frontal collision can be almost linearly received by the extension side member 6 and can be dispersively transmitted to the other floor components 4, 5 and 3. Therefore, the function as a floor skeleton member in the front-rear direction is not slightly impaired.

In particular, in this embodiment, the parallel portion 6B is disposed orthogonally to the second cross member 4 and the third cross member 5 of the vehicle width direction frame member, so that the inclined portion 6A to the parallel portion 6B. The changed shape, that is, the joint surface of the inner flange of the flange 7 in the vehicle width direction is
The decrease in strength due to the change from the floor panel 1 to the vertical wall surface 2a of the floor tunnel 2 is compensated for by the vehicle width direction frame members 4 and 5, so that the extension side member 6 is bent in the vehicle width direction and the vertical direction due to the longitudinal load. The rigidity can be secured.

Further, the shape gradually changing portion 6C, which transitions from the inclined portion 6A to the parallel portion 6B, is formed by the embossed portion 1A formed on the floor panel 1 and has a sectional height higher than that of the general portion.
Since the closed cross-sectional area is enlarged in the vertical direction, the strength and rigidity of the shape gradually changing portion 6C with respect to the front-back direction load can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing a floor lower surface side of an embodiment of the present invention.

FIG. 2 is a bottom view showing an embodiment of the present invention.

3 is a sectional view taken along the line AA of FIG.

4 is a sectional view taken along the line BB of FIG.

5 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

1 floor panel 1A embossed section 2 floor tunnel 2a vertical wall 4 Second cross member 5 Third Cross Member 6 extension side members 6A slope 6B Parallel part 6C shape gradually changing part 7 joint flange 10 seat rail

Claims (3)

[Claims] 1. An inverted hat type, which is continuously provided to the rear ends of side members extending in the front-rear direction on both left and right sides of the front compartment, extends around the lower surface of the floor panel, and extends in the front-rear direction. The extension side member having a cross-section has a sloped portion that gradually expands rearward from the front end of the floor toward a floor tunnel that is bulged upward at the center of the floor panel in the vehicle width direction and extends in the front-rear direction, and the sloped portion. Of the pair of left and right joint flanges continuously formed from the inclined portion to the parallel portion, the joint on the inner side in the vehicle width direction is formed. The flange is joined to a substantially horizontal floor panel surface in the same manner as the joint flange on the outside in the vehicle width direction at the inclined portion, while the parallel portion is gradually fronted from the front side to the rear side. At the part corresponding to the seat rail fixing part on the floor panel of the parallel part, which is joined from the floor panel surface along the vertical wall of the floor tunnel, and at the joining fixing point of the joining flange on the inner side in the vehicle width direction. The vehicle body floor structure is characterized in that the height of the seat rail is set at almost the same height as the seat rail fixing point. 2. The vehicle body floor structure according to claim 1, wherein the disposition portion of the parallel portion is set between the second cross member and the third cross member, which are joined and arranged on the floor panel in the vehicle width direction. 3. A shape gradual change that is joined and arranged to the embossed portion while an embossed portion that bulges upward is provided at a required portion of the floor panel where the shape gradual change portion that transitions from the inclined portion to the parallel portion is jointly arranged. The vehicle body floor structure according to claim 1, wherein the sectional height of the portion is higher than that of the general portion.