JP3329098B2 - Car body floor structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 4 shows a vehicle body floor structure of a conventional automobile, wherein 1 is a floor panel formed by bulging a floor tunnel 2 extending in the front-rear direction of a vehicle body toward a passenger compartment R at a central portion. A dash lower panel 3 separates the engine room ER from the vehicle compartment R, and includes a vertical wall 3a, an inclined wall 3b following the vertical wall 3a, and a bottom wall 3c following the inclined wall 3b. The rear end of the bottom wall 3c is overlapped and joined on the front end of the floor panel 1.

Reference numeral 4 denotes a dash side panel joined to the side of the dash lower panel 3, which is a wheel house inner 4a.
Is bulged toward the passenger compartment.

[0004] Reference numeral 6 denotes a side member joined in the vehicle longitudinal direction from the side surface of the hood ledge panel 7 constituting the side wall of the engine room E / R to the lower surface of the floor panel 1, and is formed of the hood ledge panel 7 and the dash lower panel 3. The front side member 6A is joined to the inclined wall 3b following the vertical wall portion 3a, and the extension member 6B is joined to the front side member 6A and joined from the inclined wall 3b to the lower surface of the floor panel 1. ing.

Reference numeral 8 denotes a seat disposed on the floor panel 1. At a front position near the front mounting position, the floor panel 1 is recessed downward to form a fragile portion 5 in the vehicle width direction. is there.

This similar structure is disclosed, for example, in Japanese Utility Model Laid-Open No. 1-158.
No. 283.

[0007]

In the above-described conventional vehicle body floor structure, when a collision input acts toward the rear of the vehicle at the time of a frontal collision of the vehicle, the floor panel 1 is lowered together with the extension member 6B with the fragile portion 5 as a base point. It is intended to absorb the collision energy by being bent and deformed in a U-shape, but the bottom wall 3c of the dash lower panel 3 is also deformed obliquely downward due to the downward bending deformation of the floor panel 1. When the vertical wall portion 3a of the dash lower panel 3 is deformed rearward with the retreating displacement of the front side member 6A, the inclined wall 3b of the dash lower panel 3 is formed.
4 rises and deforms as shown by the chain line in FIG. 4, and the living space around the feet of the occupant H who sits on the seat 8 and places the foot F on the inclined wall 3b is narrowed.

In view of the above, the present invention is directed to a method of forming a sloping wall and a bottom wall at a lower portion of a dash lower panel when a floor panel is bent downward in a U-shape with a side member from a fragile portion as a base point in a frontal collision of a vehicle. An object of the present invention is to provide a vehicle body floor structure which can be moved rearward substantially in a parallel state while maintaining a shape, and which can secure a living space around a foot of an occupant.

[0009]

According to a first aspect of the present invention, a bottom wall following an inclined wall of a dash lower panel is joined to a floor panel, and the floor panel is located at a front position near a seat mounting position on a front side of the dash lower panel in a vehicle width direction. In a structure in which a pair of left and right side members are joined from the inclined wall to the floor panel while forming a fragile portion, at least a portion of the dash lower panel extending from the inclined wall to the bottom wall has higher rigidity than the floor panel. The rear end of the bottom wall is joined to a position immediately before the weakened portion of the floor panel.

According to a second aspect of the present invention, an extension protruding forward is formed in the floor tunnel of the floor panel, while the wheel house of the dash side panel straddles the inclined wall and the bottom wall of the dash lower panel. With the back of the inner,
Reinforced side walls are formed on the back side of the extension of the floor tunnel and overlapped with each other.

[0011]

According to the first aspect, when a collision input acts toward the rear of the vehicle at the time of a frontal collision of the vehicle, the floor panel bends and deforms in a downward-curve shape together with the side members with the weak portion as a base. However, since the rigidity of the portion extending from the inclined wall of the dash lower panel to the bottom wall is higher than that of the floor panel, and the rear end of the bottom wall is joined to the position just before the weak portion of the floor panel, the inclined wall and The inclined wall and the bottom wall move rearward substantially parallel to each other while maintaining the opening angle with the bottom wall.

As a result, a living space around the foot of the occupant on the entire lower portion of the dash lower panel can be secured, and safety can be further enhanced.

According to the second aspect of the present invention, an extension protruding forward is formed in the floor tunnel of the floor panel, and the rear side of the wheel house inner of the dash side panel extends over the inclined wall and the bottom wall of the dash lower panel. Since the reinforcing side walls are formed on the back side of the extension of the floor tunnel and overlapped with each other, the rigidity between the inclined wall and the bottom wall of the dash lower panel is further increased, and the dash lower panel at the time of a frontal collision of the vehicle. The rearward translation of the entire lower side portion of the vehicle can be reliably performed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings, in which the same reference numerals are given to the same parts as in the above-mentioned conventional construction.

In FIG. 1 and FIG. 2, reference numeral 10 denotes a dash lower panel for separating an engine room ER from a vehicle room R.
Vertical wall portion 10a and inclined wall 10b continuing below vertical wall portion 10a
And a horizontal bottom wall 10c following the inclined wall 10b.

The dash lower panel 10 has a higher rigidity than the floor panel 1, and the rear end of the bottom wall 10c is overlapped and joined to the front end of the floor panel 1.

The dash lower panel 10 is connected to the floor panel 1
For higher rigidity, the dash lower panel 1
0 may be formed with a thickness two to three times the thickness of the floor panel 1, or the dash lower panel 10 may be formed of a high-strength steel plate.

The dash lower panel 10 may increase the overall rigidity from the vertical wall portion 10a to the bottom wall 10c. As described later, particularly high rigidity is required for the portion extending from the inclined wall 10b to the bottom wall 10c. Therefore, the vertical wall portion 10a is divided from the inclined wall 10b and the bottom wall 10c, the vertical wall portion 10a is formed of the same steel plate as the floor panel 1, and the upper edge of the inclined wall 10b is joined thereto. It may be configured.

At the front position near the front mounting position of the seat 8 disposed on the floor panel 1, the floor panel 1 is recessed downward to form a weak portion 5 in the vehicle width direction. The rear end of the bottom wall 10 c of the lower panel 10 is joined to a position immediately before the weak portion 5 formed on the floor panel 1.

The rear end of the bottom wall 10c and the floor panel 1
In order to optimize the seating posture of the occupant H seated on the seat 8 at the time of bending deformation based on the fragile portion 5 of the floor panel 1 to be described later, It is preferable that the seat cushion 8a be located at a position below the front end.

In this embodiment, an extension 2a is formed in a floor tunnel 2 formed in the front-rear direction at the center of the floor panel 1 so as to project forward and abut against an inclined wall 10b of a dash lower panel 10. is there.

On the other hand, the dash lower panel 10 straddles the inclined wall 10b and the bottom wall 10c, and the reinforcing side wall 11 overlapped and joined to the back side of the wheel house inner 4a of the dash side panel 4; Extension 2
The reinforcing side wall 12 which is superimposed and joined to the back side of a is integrally formed.

The reinforcing side wall 12 is formed in the form of a side wedge so as to overlap with and be joined to the back side of the side wall of the extension 2a. However, as shown in FIG. 3, the reinforcement side wall 12 may overlap the entire periphery of the back side of the extension 2a. As described above.

The side members 6 are joined and arranged in the longitudinal direction of the vehicle body from the side surfaces of the hood ledge panel 7 constituting the side walls of the engine compartments E and R to the lower surface of the floor panel 1. Side of the hood ledge panel 7 and the vertical wall 10a of the dash lower panel 10
The front side member 6A is joined to the inclined wall 10b, and the extension member 6B is joined to the front side member 6A from the inclined wall 10b to the lower surface of the floor panel 1.

According to the structure of the embodiment described above, when a collision input acts toward the rear of the vehicle at the time of a frontal collision of the vehicle, the floor panel 1 is bent downward in a V-shape with the extension member 6B from the weak portion 5 as a base point. Deforms and absorbs collision energy.

At this time, the dash lower panel 10 has a portion extending from the inclined wall 10b to the bottom wall 10c.
The rigidity is higher than that of the bottom wall 10c, and the rear end of the bottom wall 10c is joined to the position just before the weakened portion 5 of the floor panel 1, so that the opening angle between the inclined wall 10b and the bottom wall 10c is maintained. That is, while the shape is maintained, the above-mentioned U-shaped bending deformation occurs, and the inclined wall 10b and the bottom wall 10c move rearward substantially in parallel.

As a result, a living space around the occupant's feet on the entire lower side of the dash lower panel 10 can be secured, and safety can be further enhanced.

Particularly, in this embodiment, as described above, the floor tunnel 2 of the floor panel 1 is formed with an extension 2a projecting forward, and the dash lower panel 10 straddles the inclined wall 10b and the bottom wall 10c. Dash side panel 4
Of the wheel house inner 4a and the reinforcing side walls 11 and 12 which are respectively superimposed and joined to the back side of the extension 2a of the floor tunnel 2 so that the rigidity of the inclined wall 10b and the bottom wall 10c is reduced. The shape retention is further enhanced, and the shape retention is improved, and the rearward translation of the entire lower portion of the dash lower panel 10 at the time of a frontal collision of the vehicle can be reliably performed.

[0029]

As described above, according to the present invention, the following effects can be obtained.

(1) At least a portion of the dash lower panel extending from the inclined wall to the bottom wall has higher rigidity than the floor panel, and the rear end of the bottom wall is formed on the floor panel immediately before the weak portion formed in the vehicle width direction. Because it is joined to the position, when the floor panel is bent downward in a V-shape with the side member from the weak point at the front collision of the vehicle,
The bending deformation is performed while maintaining the shapes of the inclined wall and the bottom wall, so that the inclined wall and the bottom wall move rearward substantially in parallel, so that the entire lower side of the dash lower panel is It is possible to secure a living space around the feet of the occupants and further enhance safety.

(2) While forming an extension projecting forward in the floor tunnel of the floor panel, the rear side of the wheel house inner of the dash side panel and the floor tunnel extend over the inclined wall and the bottom wall of the dash lower panel. By forming reinforcing side walls that are overlapped and joined to the back side of the extension, the rigidity of these inclined walls and the bottom wall is further increased, the shape retention is improved, and the dash lower panel at the time of a frontal collision of the vehicle is improved. The rearward translation of the entire lower side portion can be reliably performed, and safety can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a floor panel and a dash lower panel according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of a floor panel and a dash lower panel according to a second embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor panel 5 Fragile part 6 Side member 8 Seat 10 Dash lower panel 10b Inclined wall 10c Bottom wall

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-338560 (JP, A) JP-A-63-235181 (JP, A) JP-A 4-112178 (JP, U) JP-A-6-235181 18164 (JP, U) Japanese Utility Model 1-170078 (JP, U) Japanese Utility Model 1-158283 (JP, U) Japanese Utility Model 61-14176 (JP, U) Japanese Utility Model 6-92265 (JP, U) 63-168166 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (2)

(57) [Claims] 1. A bottom wall following an inclined wall of a dash lower panel is joined to a floor panel, and a fragile portion is formed in a vehicle width direction at a front position near an attachment position of a seat front side of the floor panel, and a floor is formed from the inclined wall. In a structure in which a pair of left and right side members are joined across the panel, at least a portion of the dash lower panel extending from the inclined wall to the bottom wall is made higher in rigidity than the floor panel, and the rear end of the bottom wall is connected to the floor panel. A vehicle body floor structure which is joined immediately before a fragile portion. 2. The floor panel has a floor tunnel formed with an extension protruding forward, while straddling an inclined wall and a bottom wall of a dash lower panel, a back side of a wheel house inner of a dash side panel, and a floor. 2. The vehicle body floor structure according to claim 1, wherein reinforcing side walls which are respectively overlapped and joined are formed on the back side of the extension of the tunnel.