JP7201736B2 - car body structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure around a dash panel that separates a luggage compartment from a passenger compartment.

A load in the width direction of the vehicle is input from the front wheels and the like when the vehicle turns, etc., to a dash lower panel that separates a so-called engine room at the front of the vehicle from a passenger compartment.
In order to prevent deformation of the dash panel due to the load in the vehicle width direction, it has been conventional practice to arrange a cross member extending in the vehicle width direction under the dash panel forming the vicinity of the floor surface of the vehicle compartment. there is
However, in many cases, a tunnel having a groove shape opening downward along the front-rear direction is arranged in the floor surface of the vehicle compartment at the center in the vehicle width direction. When a tunnel is arranged on the floor surface, the cross member cannot be configured integrally in the vehicle width direction, so it is arranged so as to be divided into left and right with the tunnel interposed therebetween. Therefore, the portion of the dash panel where the cross member is divided cannot increase the rigidity against the load in the vehicle width direction.
In view of this, Patent Document 1 proposes a configuration in which a tunnel reinforcing member is arranged at the groove bottom of the tunnel and the left and right cross members are connected via the tunnel reinforcing member.

Japanese Patent No. 6368851

By the way, although the structure of Patent Document 1 can suppress the collapse of the groove bottom of the tunnel against the load in the vehicle width direction, the bending deformation and collapse of the groove wall and the connection between the tunnel and the floor of the vehicle compartment can be prevented. There is room for improvement in suppressing deformation of the part.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle body structure capable of increasing the rigidity of the entire dash lower panel, including the area around the tunnel, against loads in the vehicle width direction. .

In order to achieve the above object, a vehicle body structure according to the present invention includes a panel main body portion facing in the longitudinal direction of the vehicle and a toe board portion continuing below the panel main body portion, while separating the luggage compartment from the vehicle compartment. and a tunnel having a groove shape that opens downward, one side end of which is connected to the center of the dash lower panel in the vehicle width direction, and extends along the vehicle front-rear direction on the floor of the vehicle compartment. a cross member disposed on the dash lower panel along the vehicle width direction from the side of the vehicle compartment to the tunnel and forming a closed cross section on the plate surface of the dash lower panel; a side frame supported by the dash lower panel while extending along the longitudinal direction of the vehicle, the cross member extending from a portion of the dash lower panel overlapping the side frame in the longitudinal direction to the tunnel. While extending in the vehicle width direction across the groove wall portion, the groove wall portion and the passenger compartment floor portion are arranged so as to straddle a floor tunnel ridge line indicating the boundary portion between the groove wall portion and the passenger compartment floor portion. The enlarged terminal portion is located between the front and rear surfaces facing the vehicle front-rear direction and the dash lower panel and the front and rear surfaces, and extends obliquely with respect to the vehicle width direction. an inclined surface having an inclined plate surface, wherein the vehicle width direction inner end of the inclined surface is positioned at the height of the groove bottom of the tunnel and becomes higher from the vehicle width direction outer side toward the inner side. , and the front and rear surfaces of the enlarged end portion have a substantially triangular shape separated by the inclined surface, the groove wall portion, and the floor portion of the passenger compartment .

According to the present invention, it is possible to provide a vehicle body structure capable of increasing the rigidity of the dash lower panel, including the area around the tunnel, against the load in the vehicle width direction.

It is a front view showing the dash lower panel of one embodiment. It is a perspective view showing the dash lower panel of one embodiment. It is a perspective view showing the dash lower panel of one embodiment. FIG. 2 is an enlarged front view of a main part showing a dash lower panel of one embodiment; 3 is a cross-sectional view taken along line V-V of FIG. 2; FIG. 3 is a cross-sectional view taken along line VI-VI of FIG. 2; FIG. 3 is a cross-sectional view taken along line VII-VII of FIG. 2; FIG. 3 is a cross-sectional view taken along line VIII-VIII of FIG. 2; FIG.

One embodiment of the vehicle body structure 1 of the present invention will be described in detail with reference to FIGS. 1 to 8. FIG.
In the description, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted.
Also, in the following description, unless otherwise specified, the terms "front", "rear", "upper", "lower", "inner", and "outer" refer to "front" and "rear" in the longitudinal direction of the vehicle, and the vertical direction of the vehicle. "Upper" and "Lower" in the direction, and "Inner" and "Outer" in the vehicle width direction.

The vehicle body structure 1 of the present embodiment includes a tunnel TN extending along the longitudinal direction of the vehicle, a dash lower panel 10 that separates the vehicle compartment RC and the luggage compartment RL, and (see Figures 1 and 2).
The passenger compartment RC is set in the center of the vehicle and is a space for a passenger to get on.
The cargo room RL is set in the front part of the vehicle, and is a space called an engine room that mainly accommodates equipment that is a power source such as an engine.

A front side frame FS (side frame) is arranged in the cargo room RL.
The front side frame FS (side frame) extends in the longitudinal direction of the vehicle from the luggage compartment RL to the floor of the vehicle compartment RC, and its rear end is joined to and supported by the dash lower panel 10 .
Devices such as an engine (not shown) are installed on the front side frame FS.

The tunnel TN has a groove shape extending in the longitudinal direction of the vehicle while opening downward (see FIGS. 1 and 2).
A front end (one side end) of the tunnel TN is connected and coupled to the central portion of the dash lower panel 10 in the vehicle width direction.
The tunnel TN is composed of a tunnel member TN1 and a tunnel lead-in portion 14 (panel-side tunnel 14a, tunnel connecting member 14b) arranged continuously in the front-rear direction.

The tunnel member TN1 and the tunnel introduction portion 14 (the panel-side tunnel 14a and the tunnel connecting member 14b) are arranged to be connected in the front-rear direction.
It should be noted that the vehicle body structure 1 of the present embodiment can be constructed substantially symmetrically with the tunnel TN interposed therebetween, and similar effects can be obtained.
Therefore, in the following description, only the configuration of the left side (driver's seat side) will be described, and the description of the right side (passenger side) will be omitted.

The tunnel member TN1 has a groove shape extending along the vehicle front-rear direction while opening downward.
Further, the tunnel member TN1 is connected at its front end to the rear end of the tunnel connecting member 14b.

The dash lower panel 10 is made of a plate-like member, partitions the vehicle compartment RC and the luggage compartment RL, constitutes a lower part of the front surface of the vehicle compartment, and is continuous with the floor surface of the vehicle compartment RC (see FIGS. 1 to 3). reference).
The dash lower panel 10 includes a panel main body portion 11 , a tunnel introduction portion 14 (panel side tunnel 14 a and tunnel connecting member 14 b ), a wheel house portion 12 , a toe board portion 13 (vehicle floor portion), and a cross member 20 .
The panel body portion 11, the toe board portion 13, the wheel house portion 12, and the panel side tunnel 14a, which constitute the dash lower panel 10, are integrally formed by pressing a single plate material.

The panel main body 11 has a substantially flat plate shape and vertically extends from the left end to the right end of the front surface of the vehicle compartment, facing the front-rear direction of the vehicle.
The tunnel introduction portion 14 is set at the lower portion of the center of the panel main body portion 11 in the vehicle width direction.
Further, the tunnel introduction portion 14 has a downwardly opening groove shape similar to that of the tunnel member TN1 described above.

The tunnel introduction portion 14 constitutes the front end portion (one side end portion) of the tunnel TN and is continuous with the panel body portion 11 .
The tunnel introduction portion 14 is composed of a panel-side tunnel 14a and a tunnel connecting member 14b (a member having a tunnel shape).

The panel-side tunnel 14a is formed on the same member together with the panel body 11 by press working.
The tunnel connecting member 14b (a member having a tunnel shape) is composed of a plate-like member that is separate from the panel-side tunnel 14a.
The tunnel connecting member 14b is formed into a downward groove shape similar to that of the tunnel member TN1 by pressing.
The front end of the tunnel connecting member 14b is connected and joined to the panel-side tunnel 14a, and the rear end of the tunnel connecting member 14b is connected and joined to the front end of the tunnel member TN1.

The material and thickness of the plate-shaped member that constitutes the tunnel connecting member 14b are appropriately set.
Therefore, it is possible to employ a material and plate thickness different from those of the panel-side tunnel 14a (dash lower panel 10) and the tunnel member TN1.
For example, it is possible to use a plate material that is harder than the panel-side tunnel 14a, or a plate material that is thicker than the panel-side tunnel 14a. With such a configuration, the rigidity of the tunnel introduction portion 14 can be increased.

A groove shape forming the tunnel connecting member 14b (tunnel TN) is formed by a groove bottom portion TNa and a groove wall portion TNb.
A boundary portion between the groove bottom portion TNa and the groove wall portion TNb forms a mountain-folded ridgeline (hereinafter referred to as a tunnel ridgeline LTN1) as viewed from the vehicle interior.
That is, the tunnel ridgeline LTN1 extends substantially parallel along the vehicle front-rear direction.

The groove bottom portion TNa constitutes the ceiling portion of the tunnel TN while constituting the groove-shaped bottom portion.
Therefore, the groove bottom TNa extends along the longitudinal direction of the vehicle in a strip shape at a position one step higher than the floor surface of the compartment RC, substantially parallel to the floor surface.

The groove wall portion TNb extends downward from the side edge portion of the groove bottom portion TNa.
That is, the groove wall portion TNb is a pair of wall surfaces facing the vehicle width direction along the vehicle front-rear direction and opposed to each other with the groove bottom portion TNa therebetween.
Further, the groove wall portion TNb has a lower edge portion (groove-shaped opening edge portion) continuous with the floor surface of the compartment RC.
A boundary portion between the lower edge portion of the groove wall portion TNb and the floor surface of the vehicle compartment RC forms a valley-fold ridgeline (hereinafter referred to as a floor tunnel ridgeline LTN2) as viewed from the vehicle compartment.
That is, the floor tunnel ridgeline LTN2 extends substantially parallel along the vehicle front-rear direction while sandwiching the tunnel ridgeline LTN1.

A pair of left and right wheel house portions 12 are provided at the vehicle width direction outside peripheral portion of the lower portion of the panel main body portion 11 (see FIGS. 2 and 3).
The wheel house portion 12 constitutes part of a wheel house (not shown) that accommodates left and right front wheels (not shown).
The wheel housing portion 12 is curved to accommodate left and right front wheels (not shown) to be steered, and forms a substantially ⅛ spherical shape.

The toe board portion 13 (vehicle floor portion) is set between the tunnel introduction portion 14 and the left and right wheel house portions 12 in the vehicle width direction (see FIGS. 2 and 3).
In addition, the toeboard portion 13 connects the lower portion of the panel main body portion 11 and the floor surface of the vehicle compartment in the vehicle front-rear direction.
The front edge of the toeboard portion 13 is continuous with the lower edge of the panel main body portion 11 and is slightly inclined rearwardly downward with respect to the horizontal plane.
Therefore, the boundary portion between the toeboard portion 13 and the panel main body portion 11 forms a ridgeline of valley fold (hereinafter referred to as a panel ridgeline L10) as viewed from the vehicle interior.

The cross member 20 is arranged along the vehicle width direction on the board surface of the dash lower panel 10 on the vehicle interior side, from the vehicle interior side (vehicle width direction outer edge) to the groove wall portion TNb of the panel side tunnel 14a. (See Figures 1 and 2).
Further, the cross member 20 is arranged across a portion on the dash lower panel 10 that is continuous from the panel main body portion 11 to the toeboard portion 13 in the vehicle front-rear direction.
That is, the cross member 20 is arranged on the dash lower panel 10 so as to straddle the panel edge line L10 in the vehicle front-rear direction.

In addition, the cross member 20 is configured as a separate member from the plate-like member that configures the dash lower panel 10 (the panel main body portion 11, the wheel house portion 12, and the toe board portion 13).
The cross member 20 is installed on the dash lower panel 10 as a reinforcing member and forms a closed cross-section together with the dash lower panel 10 .
The cross member 20 is composed of an outer cross member 21 and an inner cross member 24 (enlarged end portions).
The outer cross member 21 and the inner cross member 24 are constructed as separate members.

The outer cross member 21 is arranged from the side of the vehicle interior (outer edge in the vehicle width direction) to a portion of the panel main body 11 that supports the front side frame FS.
The outer cross member 21 forms a closed cross section together with the dash lower panel 10 (see FIGS. 1 and 2).
The outer cross member 21 includes an outer member body 21a, a joint extension 22 and an outer member flange 23. As shown in FIG.

The outer member main body 21a, the joint extension 22, and the outer member flange 23 are integrally formed on the same member by pressing a single plate member.
As a result, the outer cross member 21 forms a T shape.

The outer member main body 21a is curved along the shape of the wheel house portion 12 at the boundary portion between the wheel house portion 12 and the toe board portion 13, and is arranged so as to straddle the ridgeline of the boundary portion.
In addition, the outer member body 21a is arranged so as to extend in the vehicle width direction along the plate surface of the panel body 11 at the boundary between the panel body 11 and the toe board 13 and straddle the ridgeline of the boundary. It is
The outer member body 21a includes outer body upper and lower surfaces 21b and outer body front and rear surfaces 21c.

The upper and lower surfaces 21b of the outer main body face in the vertical direction and are substantially parallel to the plate surface of the front end portion of the toe board portion 13 while following the curved surface of the wheel house portion 12 and the plate surface of the lower portion of the panel main body portion 11. extended.
The outer main body front-rear surface 21c extends substantially parallel to the plate surfaces of the lower end portion of the wheel house portion 12 and the lower end portion of the panel main body portion 11 while facing in the front-rear direction.
The outer member main body 21a has a substantially L-shaped cross section by the upper and lower surfaces 21b of the outer main body and the front and rear surfaces 21c of the outer main body.
A corner portion of the substantially L-shaped cross section forms a mountain-folded ridgeline (outer member ridgeline L21) when viewed from the vehicle interior.

The joint extension part 22 is formed in a groove shape with an approximately isosceles trapezoidal cross-section opening forward (see FIG. 6).
The joint extension portion 22 is set at a portion overlapping the front side frame FS in the panel main body portion 11 (dash lower panel 10) in the plate thickness direction.
The joint extension 22 extends from the outer member main body 21a along the front side frame FS.
The joint extension portion 22 includes extension front and rear surfaces 22a and extension left and right surfaces 22b.

The extended front-rear surface 22 a extends vertically along the plate surface of the panel body 11 while facing the front-rear direction.
The extended left and right surfaces 22b are a pair of left and right plate surfaces arranged on the panel main body 11 while facing each other in the vehicle width direction.
The extended left and right surfaces 22b are erected toward the panel main body 11 from the vehicle width direction side edge portions of the extended front and rear surfaces 22a.
The extension left and right surfaces 22b are set so that the distance between the extension front and rear surfaces 22a and the panel surface of the panel main body 11 becomes smaller toward the tip side (upper side) of the joint extension portion 22 .

The closed cross section formed by the joint extension 22 and the closed cross section formed by the outer cross member 21 are continuous to form one space.
The outer member flange 23 is set as a joint when the outer cross member 21 is joined to the dash lower panel 10, and is provided at the peripheral edge portion of the outer member body 21a and the joint extension portion 22. As shown in FIG.
The cross member 20 is installed integrally with the dash lower panel 10 by joining the outer member flange 23 to the dash lower panel 10 by spot welding or the like.

The inner cross member 24 is installed along the vehicle width direction and forms a closed cross section together with the dash lower panel 10 (see FIGS. 1, 2, 4 and 5).
The inner cross member 24 is installed such that its outer end in the vehicle width direction overlaps the inner end of the outer cross member 21 in the vehicle width direction.
In addition, the inner cross member 24 is joined at its inner end in the vehicle width direction to the groove wall portion TNb and the groove bottom portion TNa of the panel-side tunnel 14a forming the tunnel TN.

The inner cross member 24 includes an inner member body 24a and an inner member flange 28. As shown in FIG.
The inner member main body 24a and the inner member flange 28 are integrally formed on the same member by pressing a single plate member.

The inner member main body 24a has a triangular section 25 and a quadrilateral section 26 .
The inner member main body 24a has a triangular cross section 25 positioned on the outer side in the vehicle width direction and a quadrilateral cross section 26 positioned on the inner side in the vehicle width direction. It is formed continuously in the width direction.
The triangular cross section 25 forms a substantially triangular closed cross section together with the dash lower panel 10 (see FIG. 8).
The triangular section 25 has a triangular section upper and lower surface 25a and a triangular section front and rear surface 25b.

The triangular section upper and lower surfaces 25a face in the vertical direction, and the front edge sides thereof extend inward in the vehicle width direction from the inner ends of the outer main body upper and lower surfaces 21b along the plate surface of the lower portion of the panel main body 11. exist.
The triangular section front and rear surface 25b faces in the front-rear direction, and the lower edge side extends inward in the vehicle width direction from the inner end of the outer main body front and rear surface 21c along the plate surface of the front edge portion of the toeboard portion 13. extended.
Further, the upper edge side of the triangular cross-section front and rear surfaces 25b is continuous with the rear edge of the triangular cross-section upper and lower surfaces 25a.

As a result, the triangular section 25 has a substantially L-shaped cross section with the triangular section upper and lower surfaces 25a and the triangular section front and rear surfaces 25b.
A corner portion of the substantially L-shaped cross section forms a mountain-folded ridge line (hereinafter, this ridge line is referred to as a triangular cross section ridge line L25) when viewed from the vehicle interior.
The portion on the dash lower panel 10 where the triangular section 25 is installed is gently curved from the panel main body 11 to the toeboard portion 13 and continuous, and no clear ridge line is formed.
As a result, the cross-sectional shape of the closed cross section formed by the panel and the triangular cross section 25 forms a substantially triangular shape when viewed from the side.

Together with the dash lower panel 10, the quadrilateral cross-section portion 26 forms a substantially parallelogram-shaped closed cross section (see FIGS. 6 and 7).
The quadrilateral cross section 26 includes a quadrilateral cross section inclined surface 26 a (inclined surface), a quadrilateral cross section front and rear surface 26 b (front and rear surface), and a forked surface 27 .

The front edge side of the quadrilateral section inclined surface 26a (inclined surface) extends from the inner end of the triangular section upper and lower surfaces 25a along the lower plate surface of the panel main body 11 to the tunnel ridgeline of the panel side tunnel 14a. It extends linearly toward LTN1.
That is, the quadrilateral cross-section sloped surface 26a is linearly sloped so as to become higher from the outside toward the inside in the vehicle width direction.
The quadrilateral cross-section sloped surface 26a is set so that the inner end in the vehicle width direction is positioned at the height of the groove bottom TNa of the tunnel TN.

The quadrilateral cross section front and rear surface 26b (front and rear surface) faces the vehicle front and rear direction, and the lower edge side thereof extends along the plate surface of the front edge portion of the toe board portion 13 and extends along the inner edge of the triangular cross section front and rear surface 25b. extends inward in the vehicle width direction from the
Further, the front and rear surfaces 26b of the quadrilateral cross section extend substantially parallel to the plate surface of the lower end portion of the panel main body 11. As shown in FIG.
Further, the upper edge side of the quadrilateral cross-section front and rear surfaces 26b is continuous with the rear edge of the quadrilateral cross-section inclined surface 26a.

Thus, the quadrilateral cross section 26 forms a substantially L-shaped cross section with the quadrilateral cross section inclined surface 26a and the quadrilateral cross section front and rear surfaces 26b.
A corner portion of the substantially L-shaped cross section forms a mountain-fold ridgeline (hereinafter, this ridgeline is referred to as a quadrilateral cross-section ridgeline L26) when viewed from the vehicle interior.
Further, the front and rear surfaces 26b of the quadrilateral cross section have their vehicle width direction inner edges extending in the vertical direction along the groove wall portion TNb of the panel side tunnel 14a.

With such a configuration, the quadrilateral cross-section portion 26 has a substantially triangular shape that is divided by the quadrilateral cross-section inclined surface 26a, the groove wall portion TNb, and the toe board portion 13 (vehicle floor portion) when viewed from the rear. are doing.
The quadrilateral cross section ridgeline L26 is branched at its vehicle width direction inner end into a bifurcated front ridgeline L27a and a bifurcated rear ridgeline L27b. A forked surface 27 is arranged.
The triangular cross section ridgeline L25, the quadrilateral cross section ridgeline L26, the bifurcated front ridgeline L27a, and the bifurcated rear ridgeline L27b are collectively referred to as the inner member ridgeline L24.

Further, the quadrilateral cross-sectional portion 26 is installed at a portion on the dash lower panel 10 where the panel main body portion 11 and the toeboard portion 13 are continuous with respect to the vehicle front-rear direction.
At this portion, the dash lower panel 10 is bent to have a substantially L-shaped cross section, forming a valley-fold ridgeline (hereinafter, this ridgeline is referred to as a panel ridgeline L10) as viewed from the vehicle interior.
In other words, the quadrilateral cross section 26 is installed so as to straddle the panel edge line L10.
As a result, the closed cross section formed by the panel main body portion 11, the toe board portion 13, and the quadrilateral cross section portion 26 has a substantially parallelogram cross-sectional shape when viewed from the side (see FIG. 7).

Further, the quadrilateral cross-sectional portion 26 is installed at a portion on the dash lower panel 10 where the panel main body portion 11 and the groove wall portion TNb of the panel-side tunnel 14a are continuous in the vehicle width direction.
In other words, the quadrilateral cross-section portion 26 is arranged so as to straddle the ridgeline of the valley bend when viewed from the vehicle interior.
As a result, the closed cross section formed by the panel body 11, the groove wall portion TNb of the panel-side tunnel 14a, and the quadrilateral cross section 26 has a substantially parallelogram shape in plan view (see FIG. 6). .

The bifurcated surface 27 is disposed at the vehicle width direction inner end of the quadrilateral cross-section 26, sandwiched between the quadrilateral cross-section inclined surface 26a and the quadrilateral cross-section front and rear surfaces 26b, forming a substantially triangular shape. (See FIG. 4).
In other words, the quadrilateral cross section ridgeline L26 is divided into a bifurcated front ridgeline L27a and a bifurcated rear ridgeline L27b at its inner end in the vehicle width direction, and is arranged between the bifurcated front ridgeline L27a and the bifurcated rear ridgeline L27b. It is
The bifurcated surface 27 extends along the bottom surface of the groove bottom TNa of the panel-side tunnel 14a.

The inner member flange 28 is set as a joint for joining the inner cross member 24 to the dash lower panel 10, and is provided at the peripheral portion of the inner member main body 24a (see FIG. 4).
The inner cross member 24 is installed integrally with the dash lower panel 10 by joining the inner member flange 28 to the dash lower panel 10 by spot welding or the like.
In addition, the inner member flange 28 is installed so that its outer edge in the vehicle width direction overlaps with the outer member flange 23 positioned at the inner edge in the vehicle width direction of the outer cross member 21 .
In other words, the inner cross member 24 is installed so that its outer end in the vehicle width direction overlaps the inner end in the vehicle width direction of the outer cross member 21 .

Next, the effects of this embodiment will be described.
In the vehicle body structure 1 of the present embodiment, the inner cross member 24 (enlarged terminal portion) extends from the portion overlapping the front side frame FS (side frame) on the dash lower panel 10 to the groove wall portion TNb of the panel-side tunnel 14a. It extends in the vehicle width direction.
Furthermore, in the vehicle body structure 1 of the present embodiment, the cross member 20 is installed so as to straddle the floor tunnel ridgeline LTN2.

As a result, when a vehicle width direction load is applied to the dash lower panel 10, the inner cross member 24 functions as a brace and a bearing wall, and the rigidity of the base portion of the tunnel TN can be increased.
It is possible to suppress bending deformation of the foot portion of the tunnel TN when a load in the vehicle width direction (hereinafter referred to as a lateral load) is input to the dash lower panel 10 from the front side frame during turning.

Further, in the vehicle body structure 1 of the present embodiment, the vehicle width direction inner end portion of the quadrilateral cross-sectional inclined surface 26a (inclined surface) is positioned at the height of the groove bottom portion TNa of the tunnel TN, and is positioned from the vehicle width direction outer side. It slopes linearly so that it becomes higher as it goes inward.
As a result, continuity of rigidity can be ensured in the vehicle width direction even if the tunnel TN is sandwiched therebetween, so that the lateral load input to the floor of the vehicle can be transmitted to the groove bottom TNa of the tunnel TN.
Further, since the groove bottom TNa of the tunnel TN is formed of a flat surface along the horizontal direction, a load in the vehicle width direction (lateral load) is input as a shear load.
This can further increase the rigidity of the base portion of the tunnel TN.

In addition, in the vehicle body structure 1 of the present embodiment, the quadrilateral section front and rear surfaces 26b (the front and rear surfaces of the enlarged terminal portion) are composed of the quadrilateral section inclined surfaces 26a (inclined surfaces), the groove wall portions TNb, the toe board portion 13 (vehicle It has a substantially triangular shape separated by the room floor).
This makes it possible to further increase the rigidity of the base portion of the tunnel TN.

In addition, in the vehicle body structure 1 of the present embodiment, the quadrilateral cross-section portion 26 (enlarged terminal portion), along with the quadrilateral cross-section inclined surface 26a, the quadrilateral cross-section front and rear surface 26b, the groove wall portion TNb, and the panel main body portion 11, They are arranged so as to form a closed cross-section with a substantially parallelogram-shaped cross section.
As a result, the rigidity in the vertical direction of the vehicle and the rigidity in the vehicle width direction can be increased while suppressing the amount of protrusion of the cross member 20 toward the passenger compartment.

Further, in the vehicle body structure 1 of the present embodiment, the bifurcated surface 27 is arranged so as to be sandwiched between the quadrilateral cross-section front and rear surfaces 26b (the front and rear surfaces of the enlarged terminal portion) and the quadrilateral cross-section inclined surface 26a (inclined surface). ing.
As a result, the input lateral load can be effectively transmitted to the groove bottom portion TNa of the tunnel TN while maintaining the substantially parallelogram cross-sectional shape formed by the quadrilateral cross-sectional portion 26 and the dash lower panel 10.

Further, in the vehicle body structure 1 of the present embodiment, the quadrilateral cross-sectional portion 26 (enlarged terminal portion) is arranged so as to straddle the portion where the panel main body portion 11 and the toe board portion 13 are continuous.
Thereby, the lateral load transmitted along the panel edge line L10 can be transmitted to the groove bottom TNa side of the tunnel TN.
Then, the lateral load transmitted to the groove opening of the tunnel TN is reduced, and the collapse of the tunnel TN can be suppressed.

Further, in the vehicle body structure 1 of the present embodiment, the tunnel introduction portion 14 is composed of the panel-side tunnel 14a and the tunnel connecting member 14b (a member having a tunnel shape).
As a result, the reduction amount of the tunnel introduction portion 14 of the dash lower panel 10 can be suppressed, so that workability during press working can be improved.
Further, by forming the tunnel connecting member 14b as a separate member from the panel main body portion 11, it is possible to employ a material and a member having a shape that can further increase the rigidity of the tunnel TN.

In the vehicle body structure 1 of this embodiment, the cross member 20 is composed of two members, the outer cross member 21 and the inner cross member 24, and the outer cross member 21 and the inner cross member 24 are joined by spot welding or the like. It is
As a result, the die for pressing the cross member 20 can be made smaller, and productivity can be improved.

It should be noted that the present invention does not limit the cross member 20 to a two-member structure consisting of the outer cross member 21 and the inner cross member 24 .
For example, it is possible to divide the outer cross member 21 into the wheel house portion 12 side and the joint extension portion 22 side, and combine them with the inner cross member 24 to form three members.
And even if it is such a structure, there can exist an effect similar to this embodiment.

Further, in the vehicle body structure 1 of the present embodiment, the cross member 20 is provided at a portion of the panel main body portion 11 (dash lower panel 10) overlapping the front side frame FS in the plate thickness direction, along the front side frame FS from the outer member main body 21a. It has a joint extension 22 that extends through it.
As a result, the load input from the front side frame FS can be transmitted to the cross member 20, so deformation of the dash lower panel 10 when the load is input can be suppressed.

Further, in the vehicle body structure 1 of the present embodiment, the joint portion between the panel-side tunnel 14a and the tunnel connecting member 14b (a member having a tunnel shape) overlaps the joint portion between the inner member flange 28 and the groove wall portion TNb. is set.
As a result, the plate thickness of the joint portion is increased, so that the rigidity against lateral load can be increased without increasing the number of parts and weight.

In addition, in the vehicle body structure 1 of the present embodiment, the cargo room RL is set in front of the vehicle room RC, but it is not limited to such a form.
For example, the same effect can be achieved by setting the luggage compartment behind the vehicle compartment RC and arranging the cross member 20 of the present embodiment on the dash lower panel 10 that separates the vehicle compartment RC and the luggage compartment. can.

1 Body structure 10 Dash lower panel 11 Panel body 13 Toe board 14b Tunnel connection member (member having a tunnel shape)
20 cross member 22 joint extension 24 inner cross member (enlarged end)
26a Quadrilateral section inclined surface (inclined surface)
26b Quadrilateral cross section front and rear surfaces (front and rear surfaces)
27 Forked surface FS Front side frame (side frame)
RL Luggage room RC Car room TN Tunnel TNa Groove bottom TNb Groove wall LTN2 Floor tunnel ridgeline

Claims (8)

a dash lower panel that separates a luggage compartment from a vehicle compartment while having a panel main body facing in the longitudinal direction of the vehicle and a toeboard section continuing below the panel main body;
a tunnel having a downwardly opening groove shape, one side end of which is connected to the center of the dash lower panel in the vehicle width direction, and which extends along the vehicle front-rear direction on the floor of the vehicle compartment;
a cross member arranged on the dash lower panel along the vehicle width direction from the side of the vehicle compartment to the tunnel and forming a closed cross section on the plate surface of the dash lower panel;
a side frame that extends in the longitudinal direction of the vehicle from the inside of the luggage compartment to the floor of the vehicle compartment and is supported by the dash lower panel;
The cross member is
A floor that extends in the vehicle width direction from a portion of the dash lower panel that overlaps the side frame in the longitudinal direction across the groove wall of the tunnel and indicates a boundary portion between the groove wall and the passenger compartment floor. An enlarged end portion joined to the groove wall portion and the toe board portion so as to straddle the tunnel ridge ,
The enlarged terminal part is
front and rear surfaces facing the vehicle front-rear direction;
an inclined surface having a plate surface that is positioned between the dash lower panel and the front and rear surfaces and that is inclined with respect to the vehicle width direction;
with
The inclined surface is
The inner end in the vehicle width direction is located at the height of the groove bottom of the tunnel and is linearly inclined so that the height increases from the outer side to the inner side in the vehicle width direction,
The front and rear surfaces of the enlarged terminal portion are
It has a substantially triangular shape separated by the inclined surface, the groove wall portion, and the passenger compartment floor portion.
A vehicle body structure characterized by: The enlarged terminal part is
2. The vehicle body structure according to claim 1 , wherein the inclined surface, the front and rear surfaces, the groove wall portion, and the panel body portion are arranged so as to form a closed cross section having a substantially parallelogram-shaped cross section. The enlarged terminal part is
3. The vehicle body structure according to claim 2 , further comprising a bifurcated surface arranged so as to be sandwiched between the inclined surface and the front and rear surfaces at the inner end portion in the vehicle width direction. The enlarged terminal part is
3. The vehicle body structure according to claim 2 , wherein the panel main body portion and the vehicle interior floor portion are arranged so as to straddle a continuous portion. 2. The vehicle body structure according to claim 1, wherein the tunnel is composed of the dash lower panel and a tunnel-shaped member. The cross member is
It consists of multiple members divided in the vehicle width direction,
These multiple members are
joined and formed into one piece
The vehicle body structure according to claim 1, characterized in that: a dash lower panel that separates a luggage compartment from a vehicle compartment while having a panel main body facing in the longitudinal direction of the vehicle and a toeboard section continuing below the panel main body;
a tunnel having a downwardly opening groove shape, one side end of which is connected to the center of the dash lower panel in the vehicle width direction, and which extends along the vehicle front-rear direction on the floor of the vehicle compartment;
a cross member arranged on the dash lower panel along the vehicle width direction from the side of the vehicle compartment to the tunnel and forming a closed cross section on the plate surface of the dash lower panel;
a side frame that extends in the longitudinal direction of the vehicle from the inside of the luggage compartment to the floor of the vehicle compartment and is supported by the dash lower panel;
The cross member is
A floor that extends in the vehicle width direction from a portion of the dash lower panel that overlaps the side frame in the longitudinal direction across the groove wall of the tunnel and indicates a boundary portion between the groove wall and the passenger compartment floor. An enlarged end portion joined to the groove wall portion and the toe board portion so as to straddle the tunnel ridge,
The cross member is
A vehicle body structure, comprising: a joint extension portion extending along the side frame at a portion of the dash lower panel overlapping the side frame in a plate thickness direction. The joint between the dash lower panel and the tunnel-shaped member is
6. The vehicle body structure according to claim 5 , wherein the cross member and the tunnel are set so as to overlap each other.

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