JP2003191862A - Vehicle body front structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve curve resistance against collision load of a front side member itself at a rear end of a joint part with a dash cross member. <P>SOLUTION: Both ends 18A in the vehicle body width direction of a dash cross member 18 are connected with a vehicle rear side face 14A in an inclined part 14 of a front side member 10, and both ends 18A of the vehicle width direction of the dash cross member 18 on the vehicle rear side are supported by a cross section enlarging part 36 projecting above the vehicle in the front member 10. As a result, unlike a conventional art, a cross section height H is not rapidly decreased at the rear end of a joint part of the front side member 10 with the dash cross member 18. <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 a vehicle body front structure, and more particularly to a vehicle body front structure of a vehicle such as an automobile having a front side member and a dash cross member.

[0002]

2. Description of the Related Art Conventionally, an example of a vehicle body front structure of a vehicle including a front side member and a dash cross member is shown in JP-A-6-32247.

As shown in FIG. 8, in this vehicle body front structure, left and right front side members 100, a dash lower cross member 102, left and right rockers 104 (also referred to as side sills), and a rear floor cross member 106,
Left and right rear side members 108 and rear cross member 11
0 is provided, the left and right extension members 112 that connect the dash lower cross member 102 and the rear floor cross member 106 are provided behind the front side member 100, and the dash lower cross member 102 and the rear floor are provided substantially at the center position in the vehicle width direction. A battery mounting frame 11 including a tunnel member 114 for connecting the cross member 106 and a plurality of battery members 116 between the rear floor cross member 106 and the rear cross member 110 is provided.
8 are provided.

[0004]

However, in this vehicle body front structure, as shown in FIG. 9, in the front side member 100, the joint portion 100A with the dash lower cross member 102 and the rear sectional height H thereof are formed.
1 is about one-third of the sectional height H of the front portion 100B of the front side member 100, and the sectional height H2 of the dash lower cross member 102 is the sectional height of the front portion 100B of the front side member 100. It is about 2/3 of H. As a result, the cross-sectional height of the rear end portion 100B of the joint portion 100A between the front side member 100 and the dash lower cross member 102 is drastically reduced. For this reason, the bending resistance against the collision load of the front side member 100 itself at the rear end portion 100B of the joint portion 100A with the dash lower cross member 102 is reduced.

In view of the above facts, it is an object of the present invention to obtain a vehicle body front structure capable of improving the bending resistance against the collision load of the front side member itself at the rear end portion of the joint with the dash cross member.

[0006]

According to a first aspect of the present invention, there is provided a front body structure in which a pair of left and right front side members are disposed in the vicinity of lower portions of both ends of a front portion of a vehicle in a vehicle width direction. In the front side member, an inclined portion formed in a portion of the front side member corresponding to the toe board portion, a dash cross member whose both ends in the vehicle width direction are connected to a vehicle rear side surface of the inclined portion of the front side member, and the front side member. And a cross-section enlarged portion that is formed to project above the vehicle and supports the vehicle rear side of the dash cross member.

Therefore, both ends of the dash cross member in the vehicle width direction are connected to the vehicle rear side surface in the inclined portion of the front side member, and the vehicle rear side of both ends of the dash cross member in the vehicle width direction is connected to the front side member. It is supported by the enlarged cross-section that is formed above the vehicle. As a result, at the rear end portion of the front side member where the dash cross member is joined, there is no portion where the cross-sectional height sharply decreases as in the prior art.
Therefore, the bending resistance of the front side member itself against the collision load at the rear end portion of the joint with the dash cross member can be improved. In addition, the cross-sectional enlarged portion can prevent the both ends of the dash cross member in the vehicle width direction from being pulled rearward from the front side member at the time of a collision.

According to a second aspect of the present invention, in the vehicle body front structure according to the first aspect, the dash cross member has a linear shape along the vehicle width direction.

Therefore, in addition to the contents described in claim 1,
By making the dash cross member a linear shape along the vehicle width direction, the dash cross member does not move in the vehicle width direction due to the collision load input from the front side member to the dash cross member, and the dash cross member does not move from the front side member to the dash cross member. The collision load input to the cross member can be reliably received by the bending strength of the dash cross member.

According to a third aspect of the present invention, in the vehicle body front structure according to any one of the first and second aspects, a floor cross member is disposed behind the dash cross member along a vehicle width direction, It has a tunnel member which is arranged horizontally in a side view and which connects the dash cross member and the floor cross member at a central portion in the vehicle width direction.

Therefore, in addition to the contents described in any one of claims 1 and 2, a tunnel member connecting the dash cross member and the floor cross member is horizontally arranged in a side view at a central portion in the vehicle width direction. There is. As a result, it is possible to suppress the vertical bending moment from being generated in the tunnel member due to the impact load input from the dash cross member to the tunnel member. Therefore, the impact load input from the dash cross member to the tunnel member can be effectively transmitted to the floor cross member.

The present invention according to claim 4 is based on claims 1 to 3.
In the vehicle body front structure according to any one of items 1 to 5, the dash cross member is an extruded material having a plurality of closed cross-section portions, and has a through hole through which a steering shaft is inserted,
At least one of the plurality of closed cross-section portions remains above the through hole.

Therefore, in addition to the contents according to any one of claims 1 to 3, since the dash cross member is an extruded material having a plurality of closed cross-sections, a dash is formed by forming a through hole through which the steering shaft is inserted. It is possible to prevent the rigidity of the part from decreasing. In addition, since at least one closed cross section remains above the through hole, it is possible to prevent a decrease in rigidity above the through hole and reduce the amount of deformation of the dash when the dash is pressed from the front of the vehicle during a collision. it can.

According to a fifth aspect of the present invention, a pair of left and right front side members are provided in the vicinity of the lower portions of both ends of the vehicle front in the vehicle width direction along the vehicle front-rear direction, and a portion of the front side member with respect to the toe board portion. A formed slope, a dash cross member whose both ends in the vehicle width direction are connected to the vehicle rear side surface of the slope of the front side member, and a front portion in plan view of the slope of the front side member; It is characterized by having an under-reinforcement that overlaps both ends of the dash cross member in the vehicle width direction.

Therefore, both ends of the dash cross member in the vehicle width direction are connected to the rear side surface of the vehicle in the inclined portion of the front side member, and the front part of the under-reinforcement serves as a toe board part of the front side member in plan view. , Overlaps with both ends of the dash cross member in the vehicle width direction. As a result, the load applied to the inclined portion (kick portion) of the front side member can be dispersed to the dash cross member. That is, the proof strength of the kick portion of the front side member can be distributed to the proof strength of the front side member, the vertical bending strength of the under reinforcement, and the front-back bending strength of the dash cross member. Therefore, it is possible to reduce the sharing resistance of the kick portion itself of the front side member, and it is possible to improve the bending resistance against the collision load of the front side member itself at the rear end portion of the joint with the dash cross member.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle body front structure according to the present invention will be described with reference to FIGS.

In the figure, the arrow FR indicates the vehicle front direction, the arrow UP indicates the vehicle upward direction, and the arrow IN indicates the vehicle width inner direction.

As shown in FIG. 3, the front side member 10 of the present embodiment is a pair of left and right along the vehicle front-rear direction in the vicinity of the lower portions of both ends of the vehicle front in the vehicle width direction (the front side member on the left side of the vehicle is not shown). It is provided and is made of light metal such as aluminum. Further, the front portion 12 of the front side member 10 is disposed in the engine room, and a portion of the front side member 10 corresponding to the toe board portion (a portion indicated by an arrow W in FIG. 5) is located from the front upper side of the vehicle. Inclined portion 1 inclined toward the rear lower side of the vehicle
4 is formed, and an extending portion 16 extends from the rear end of the inclined portion 14 toward the rear of the vehicle.

On the vehicle rear side surface 14A of the inclined portion 14 of the front side member 10, both end portions 18A of the dash cross member 18 arranged in the vehicle width direction in the vehicle width direction.
Are connected. Both end portions 18A of the dash cross member 18 in the vehicle width direction are covered with a joint plate 17, and the joint plate 17 is joined to the vehicle rear side surface 14A of the inclined portion 14 of the front side member 10.

As shown in FIG. 2, the dash cross member 18 has a linear shape along the vehicle width direction in a plan view. Although not shown, the dash cross member 18 also has a linear shape along the vehicle width direction in a front view.

As shown in FIG. 1, the dash cross member 18 has a plurality of closed cross-section portions 20, 2 divided in the vertical direction by a plurality of horizontal ribs 19 extending in the vehicle front-rear direction.
2, 24, 26, 28, 30, 32, which is made of an extruded material made of a light metal such as aluminum that is wide in the vertical direction and has a cross-section enlarged portion 3 that bulges rearward of the vehicle in the lower portion.
4 are formed. Also, the dash cross member 18
Each wall portion 18B of the upper wall, the lower wall, and the upper wall of the enlarged cross section 34 is horizontally set.

On the other hand, the inclined portion 14 of the front side member 10 is formed with a cross-sectional enlarged portion 36 projecting upward in the vehicle, and the cross-sectional enlarged portion 36 is located behind the cross-sectional enlarged portion 34 of the dash cross member 18. The lower portion of the wall portion 34A is supported from behind.

Therefore, in this embodiment, the cross-sectional height H at the rear end portion of the connecting portion between the front side member 10 and the dash cross member 18 is drastically reduced as in the prior art shown in FIG. No, at this part,
The bending resistance of the front side member 10 against the collision load does not decrease. The front portion 40A of the under-reinforcement 40 is inserted and joined to the inclined portion 14 and the extension portion 16 of the front side member 10 from the rear side.
40A of the front portion of the vehicle reaches below the dash cross member 18.

As shown in FIG. 2, the front portion 40A of the under reinforcement 40 and the front side member 1
The inclined portion 14 of 0 and the both end portions 18A in the vehicle width direction of the dash cross member 18 overlap each other in a plan view.

As shown in FIG. 3, the under-reinforcement 40 is made of an extruded material of light metal such as aluminum and has a rectangular cross section. Inside, a plurality of ribs 41 extending in the vehicle vertical direction are provided along the vehicle longitudinal direction. Is formed.

As shown in FIG. 2, behind the dash cross member 18, a floor cross member (also referred to as a seat cross member) 42 is arranged along the vehicle width direction, and a rear end of the under reinforcement 40. Part 40B
Is joined to the front wall portion 42A of the floor cross member 42. Further, between the dash cross member 18 and the floor cross member 42 at the center portion in the vehicle width direction, a tunnel member 44 linearly extending in the vehicle front-rear direction is arranged, and the rear end portion 44A of the tunnel member 44 is , Is joined to the front wall portion 42A of the floor cross member 42.

As shown in FIG. 3, the tunnel member 44
Is formed of an extruded material of light metal such as aluminum and has a rectangular cross section that is long in the vehicle width direction. Inside, a plurality of ribs 45 extending in the vehicle vertical direction are formed along the vehicle longitudinal direction.

As shown in FIG. 1, the tunnel member 44
Are arranged horizontally in a side view, and the front end portion 44B of the tunnel member 44 is disposed at the dash cross member 18
Is joined to the rear wall portion 34A in the enlarged cross-section portion 34.

As shown in FIG. 3, the extending portion 16 of the front side member 10 has a box-shaped cross-sectional structure that bulges outward in the vehicle width direction by die casting or the like. The flange 16A formed on the outer edge in the direction
It is joined to a vehicle width direction inner side wall portion 48A of the rocker 48 arranged along the vehicle front-rear direction. The rocker 48 is formed of an extruded material of light metal such as aluminum, and a plurality of ribs 50 extending in the vehicle width direction are formed inside thereof along the vehicle front-rear direction.

As shown in FIG. 2, a flange 42B formed on the vehicle width direction outer edge of the floor cross member 42 is joined to the vehicle width direction inner side wall portion 48A of the rocker 48, and the front side member 10 has a flange 42B. A bumper reinforcement 51 is connected to the front end of the front portion 12.

As shown in FIG. 4, the dash cross member 18 is formed with a through hole 62 through which the steering shaft 60 is inserted, and above the through hole 62, a plurality of closed cross section portions 20, 22, 24 ,. At least one of 26, 28, 30, 32, in the present embodiment, the closed cross section 20
Is left. Further, the front wall portion 18C of the dash cross member 18 has a linear shape in a side view, that is, a flat shape without bending, and the front wall portion 1 of the dash cross member 18 is
One end portion 64A of the column hole cover 64 for sealing the through hole 62 is attached to 8C.

An upper flange 18D extending upward and a front flange 18E extending forward are formed on the front edge of the upper end of the dash cross member 18, and these flanges 18D and 18E are dashed. Lower part 6 of panel 66
It is joined to 6A. Meanwhile, dash cross member 1
A flange 18F extending obliquely downward and rearward is formed at a rear edge portion of the lower end of 8, and the flange 18F is joined between the front side member 10 and the joining plate 17 and the floor panel 21. There is.

As shown in FIG. 3, the surface of the dash panel 66 near the upper side of the through hole 62 on the engine room side of the portion 66B is the mounting portion 70 of the brake booster.
And a brake booster (not shown) is attached.

As shown in FIG. 5, a pedal bracket 71 is provided at the connecting portion between the upper portion of the dash cross member 18 and the dash panel 66. The pedal bracket 71 has an accelerator pedal 72 and a shaft 74. It is rotatably supported around. Also, the accelerator pedal 72
When the full stroke is, the accelerator pedal 72
The lower front portion 72A of the lower end contacts the rear wall portion 34A of the enlarged cross section 34 of the dash cross member 18 via the dash insulator 76 and the carpet 78. In other drawings, the dash insulator 76
The illustration of the carpet 78 is omitted.

Next, the operation of this embodiment will be described.

In this embodiment, as shown in FIG. 3, both end portions 18A of the dash cross member 18 in the vehicle width direction are connected to the vehicle rear side surface 14A of the inclined portion 14 of the front side member 10, as shown in FIG. As described above, the vehicle rear portion of both end portions 18A in the vehicle width direction of the dash cross member 18 is supported by the enlarged cross-section portion 36 formed on the front side member 10 so as to project upward from the vehicle.
As a result, the cross-sectional height H at the rear end portion of the front side member 10 that is joined to the dash cross member 18 does not suddenly decrease as in the prior art shown in FIG. Therefore, the bending resistance against the collision load of the front side member 10 itself at the rear end portion of the joint with the dash cross member 18 can be improved. Further, the cross-sectional enlarged portion 36 can prevent the both end portions 18A of the dash cross member 18 in the vehicle width direction from being pulled rearward from the inclined portion 14 of the front side member 10 at the time of a collision.

Further, since both end portions 18A of the dash cross member 18 in the vehicle width direction are covered with the joining plates 17, and the joining plates 17 are joined to the vehicle rear side surface 14A of the inclined portion 14 of the front side member 10, It is possible to more reliably prevent the both end portions 18A of the dash cross member 18 in the vehicle width direction from being pulled rearward from the inclined portion 14 of the front side member 10 at the time of a collision.

Further, in this embodiment, as shown in FIG. 2, the front portion 40A of the under reinforcement 40,
The inclined portion 14 of the front side member 10 and the vehicle width direction end portions 18A of the dash cross member 18 overlap each other in a plan view. As a result, the load applied to the inclined portion 14 (kick portion) of the front side member 10 can be dispersed to the dash cross member 18.

That is, the proof stress of the kick portion of the front side member 10 can be distributed to the proof stress of the front side member 10, the vertical bending proof strength of the under reinforcement 40, and the longitudinal bending proof strength of the dash cross member 18. . Therefore, the proof stress of the kick portion itself of the front side member 10 can be reduced, and the bending proof strength against the collision load of the front side member 10 itself at the rear end portion of the joint with the dash cross member 18 can be improved.

Further, the sharing resistance of the kick portion itself of the front side member 10 can be reduced, and an increase in the cross section of the kick portion itself of the front side member 10 in the vehicle width direction or the vehicle vertical direction can be suppressed. For this reason, it is possible to prevent the vehicle from becoming larger or the occupant riding position to move rearward as the kick portion itself of the front side member 10 increases in size in the vehicle width direction or the vehicle vertical direction.

Further, in the present embodiment, the vertical width of the dash cross member 18 is enlarged, so that the vertical width of the inclined portion 14 of the front side member 10 to which both end portions 18A of the dash cross member 18 in the vehicle width direction are joined is also increased. It expands, and the bending proof strength in this part improves.

Further, in the present embodiment, the dash cross member 18 is extended upward, so that the dash panel 6 is provided.
The vertical dimension of 6 is shortened. Therefore, the surface rigidity of the dash panel 66 is improved, and the noise performance and steering performance of the vehicle body are improved. Further, since the surface rigidity of the brake booster mounting portion 70 of the dash panel 66 is increased, the brake hydraulic pressure can be effectively generated in the brake booster when the brake pedal is depressed. As a result, the braking force is reliably transmitted to the tire, and the braking performance is improved.

Further, in this embodiment, the dash cross member 18 has a linear shape along the vehicle width direction in plan view and front view, so that the collision load input from the front side member 10 to the dash cross member 18 (FIG. The arrow F1 of 2 does not move the dash cross member 18 in the vehicle width direction (direction of arrow A in FIG. 2). Therefore, the collision load input from the front side member 10 to the dash cross member 18 is applied to the dash cross member 1
With a bending resistance of 8, it can be reliably received. Further, this collision load is set horizontally by the wall portions 18B and the ribs 19 of the dash cross member 18, so that the tunnel member 44 is prevented.
Can be reliably dispersed. Also, the dash cross member 18
Since it has a linear shape along the vehicle width direction in plan view and front view, it is possible to suppress welding shrinkage in the vehicle width direction after welding that occurs when arc-extruding extruded materials made of light metal such as aluminum. The property is improved.

Further, in this embodiment, the tunnel member 44 connecting the dash cross member 18 and the floor cross member 42 at the center portion in the vehicle width direction is horizontally arranged in a side view as shown in FIG. There is. Therefore, the dash cross member 18 to the tunnel member 44
It is possible to suppress the vertical bending moment from being generated in the tunnel member 44 by the impact load (arrow F2 in FIG. 1) input to the tunnel member 44. As a result, the dash cross member 18
The impact load input to the tunnel member 44 can be effectively transmitted to the floor cross member 42. Further, since the tunnel member 44 is horizontally arranged in a side view, the arrangement position of the air conditioner arranged above the tunnel member 44 and the instrument panel covering the air conditioner can be set downward, so that the vehicle front The field of view can be expanded.

Further, in this embodiment, since the dash cross member 18 is an extruded material having a plurality of closed cross-sections, the through hole 62 through which the steering shaft 60 is inserted is inserted.
It is possible to prevent the rigidity of the dash portion from decreasing due to the formation of the. Further, since at least one closed cross-section portion 20 remains above the through hole 62, it is possible to prevent a decrease in rigidity above the through hole 62. Therefore, when the dash portion is pressed rearward of the vehicle by the engine at the time of a collision, The amount of deformation of the dash can be reduced.

Further, in this embodiment, since the enlarged cross section 34 is formed in the lower portion of the dash cross member 18, the bending resistance of the dash cross member 18 is improved.

Further, in this embodiment, the extending portion 16 of the front side member 10 has a box-shaped cross-sectional structure which bulges outward in the vehicle width direction by die casting or the like, and the vehicle width of the extending portion 16 is increased. 16A formed on the outer edge in the direction
Is joined to the vehicle width direction inner side wall portion 48A of the rocker 48 arranged along the vehicle front-rear direction. As a result, in the case of an offset collision or oblique collision, the collision side and the vehicle width direction opposite side,
It is possible to suppress the displacement of the dash cross member 18. Therefore, the collision load can be surely distributed to the rocker 48. Further, since the extending portion 16 of the front side member 10 has a box-shaped cross-sectional structure that bulges outward in the vehicle width direction by die casting or the like, the deformation of the extending portion 16 improves the energy absorption performance at the time of a side collision. .

In the present embodiment, the tunnel member 4
Since 4 is formed in a rectangular cross section that is long in the vehicle width direction,
The welding length of the tunnel member 44 and the dash cross member 18 or the floor cross member 42 can be increased, and the joint strength is improved.

Further, in this embodiment, the front wall portion 18C of the dash cross member 18 has a linear shape in a side view, that is, a flat shape without bending. As a result, during a collision,
The upper portion of the dash cross member 18 that is not supported by the tunnel member 44 is difficult to bend backward, and the sealing performance of the through hole 62 by the column hole cover 64 is improved.

Further, in the present embodiment, the deformation of the toe board portion (the portion indicated by the arrow W in FIG. 5) to the rear of the vehicle at the time of a collision can be suppressed by the above configuration, so that the occupant's leg portion 80 at the time of a collision.
The protection performance of is improved.

Further, in the present embodiment, when the occupant's leg portion 80 makes the accelerator pedal 72 have a full stroke, the lower end front portion 72A of the accelerator pedal 72 interposes the joint plate 17 and the enlarged cross section of the dash cross member 18 is formed. The back wall 34 </ b> A of the dash cross member 34 abuts, and the enlarged cross-section 34 of the dash cross member 18 acts as a stopper. Therefore, the durability of the accelerator pedal 72 and the accelerator pedal mounting portion is improved. On the other hand, the occupant seated in the passenger seat hits the heel against the enlarged cross section 34 of the dash cross member 18,
It is possible to keep your feet steady. Further, since the enlarged cross section 34 of the dash cross member 18 serves as a dimension measurement reference at the time of inspection of the brake pedal, serviceability is improved.

In the above, the present invention has been described in detail with respect to specific embodiments, but the present invention is not limited to such embodiments, and various other embodiments within the scope of the present invention. It is obvious to a person skilled in the art that For example, when the vehicle to which the vehicle body front structure of the invention is applied is a light weight vehicle, in the configuration of the above-described embodiment, as shown in FIG. 6, the side cross-sectional shape of the dash cross member 18 is reduced. Is also good.

Further, as shown in FIG. 7, a plurality of closed cross section portions 20, 22, 2 in the dash cross member 18 are provided.
Inside some or all of 4, 26, 28, 30, 32,
An inclined rib 82 extending from the upper side of the vehicle toward the lower side of the vehicle toward the rear of the vehicle may be added to the tunnel member 44 so that the collision load can be more effectively distributed to the tunnel member 44.

[0054]

According to the vehicle body front structure of the present invention as set forth in claim 1, a pair of left and right front side members are arranged in the vicinity of the lower portions of both ends of the vehicle front portion in the vehicle width direction along the vehicle front-rear direction. An inclined portion formed at a portion corresponding to the toeboard portion, a dash cross member whose both ends in the vehicle width direction are connected to the vehicle rear side surface of the inclined portion of the front side member, and a front side member formed so as to project above the vehicle, Since it has a cross-sectional enlarged portion that supports the vehicle rear side of the dash cross member,
The bending resistance of the front side member itself against the collision load at the rear end of the joint with the dash cross member can be improved, and at the time of a collision, both ends of the dash cross member in the vehicle width direction are prevented from being pulled backward from the front side member. It has an excellent effect that it can be done.

According to the present invention described in claim 2, in the vehicle body front structure according to claim 1, the dash cross member has a linear shape along the vehicle width direction. Therefore, in addition to the effect described in claim 1, As a result, the collision load input from the front side member to the dash cross member can be reliably received by the bending resistance of the dash cross member.

According to a third aspect of the present invention, in the vehicle body front structure according to any one of the first and second aspects, a floor cross member disposed along the vehicle width direction behind the dash cross member and a side surface. In addition to the effect according to any one of claims 1 and 2, since a dash cross member and a tunnel member that connects the floor cross member at a central portion in the vehicle width direction are provided horizontally when viewed, It has an excellent effect that the impact load inputted from the cross member to the tunnel member can be effectively transmitted to the floor cross member.

The present invention according to claim 4 is based on claims 1 to 3.
In the vehicle body front structure described in any one of 1, the dash cross member is an extruded material having a plurality of closed cross-section portions, has a through hole through which a steering shaft is inserted, and has a plurality of closed cross-section portions above the through hole. Since at least one remains, in addition to the effect according to any one of claims 1 to 3,
It has an excellent effect that the rigidity of the dash portion can be prevented from being lowered and the deformation amount of the dash portion at the time of a collision can be reduced.

According to a fifth aspect of the present invention, a pair of left and right front side members are provided in the vicinity of the lower portions of both ends of the vehicle front portion in the vehicle width direction along the vehicle front-rear direction, and the front side members are formed at portions corresponding to the toe board portion. And a dash cross member whose both ends in the vehicle width direction are connected to the rear side surface of the vehicle in the inclined portion of the front side member, and the front portion, in plan view, the inclined portion of the front side member and the dash cross member. Both ends in the vehicle width direction,
And an under-reinforcement that overlaps with each other, it is possible to improve bending resistance against a collision load of the front side member itself at the rear end portion of the joint with the dash cross member.

[Brief description of drawings]

1 is an enlarged cross-sectional view taken along line 1-1 of FIG.

FIG. 2 is a plan view showing a vehicle body front structure according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a vehicle body front structure according to an embodiment of the present invention as seen from the diagonally rearward inside side of the vehicle body.

4 is an enlarged cross-sectional view of a portion taken along line 4-4 of FIG.

FIG. 5 is a side sectional view showing a vehicle body front structure according to the embodiment of the present invention.

FIG. 6 is a side sectional view corresponding to FIG. 1, showing a vehicle body front structure according to another embodiment of the present invention.

FIG. 7 is a side sectional view showing a vehicle body front structure according to another embodiment of the present invention.

FIG. 8 is a perspective view showing a part of a vehicle body to which a conventional vehicle body front structure is applied.

FIG. 9 is a side sectional view showing a conventional vehicle body front structure.

[Explanation of symbols]

10 Front side members 12 Front of front side member 14 Front side member slope 16 Front side member extension 17 Bonding plate 18 dash cross members 18A Dash cross member widthwise ends 34 Expanded section of dash cross member 36 Enlarged section of front side member 40 Under Reinforcement 40A under-reinforcement front 42 floor cross members 44 tunnel members 60 steering shaft 62 through hole 66 dash panel

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomoko Suzuki             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F term (reference) 3D003 AA01 AA05 BB02 CA09 CA18

Claims (5)

[Claims] 1. A pair of left and right front side members arranged in the vicinity of lower portions of both ends of a vehicle front portion in a vehicle width direction along a vehicle front-rear direction, and an inclined portion formed at a portion of the front side member corresponding to a toe board portion. A dash cross member whose both end portions in the vehicle width direction are connected to a vehicle rear side surface of the inclined portion of the front side member; and a vehicle dash cross member projecting upward from the front side member to support a vehicle rear side of the dash cross member. A vehicle body front structure having an enlarged cross section. 2. The vehicle body front structure according to claim 1, wherein the dash cross member has a linear shape along a vehicle width direction. 3. A floor cross member disposed along the vehicle width direction behind the dash cross member, and a floor cross member horizontally disposed in a side view, and the dash cross member and the floor cross member at a vehicle width direction central portion. The vehicle body front structure according to any one of claims 1 and 2, further comprising: 4. The dash cross member is an extruded material having a plurality of closed cross-section portions, has a through hole through which a steering shaft is inserted, and at least one of the plurality of closed cross-section portions remains above the through hole. The vehicle body front structure according to any one of claims 1 to 3, wherein: 5. A pair of left and right front side members are provided near lower portions of both ends of a vehicle front portion in the vehicle width direction along the vehicle front-rear direction, and an inclined portion formed at a portion of the front side member with respect to the toe board portion. A dash cross member whose both end portions in the vehicle width direction are connected to a vehicle rear side surface of the inclined portion of the front side member, and a front portion in plan view of the inclined portion of the front side member and a vehicle width of the dash cross member. An under-reinforcement that overlaps with both ends in the direction, and a front structure of a vehicle body.