JP2014213762A - Front vehicle body structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front vehicle body structure of a vehicle in which, specifically in a vehicle having a short longitudinal length, an amount of collision energy absorption generated by front side frames is improved by forming a valley in a desired position of an inclined part of a dash panel at a front collision, and a space for occupant's lower limbs is secured by making even the fractured deformation of the inclined part contribute to the absorption of collision energy.SOLUTION: A front vehicle body structure of a vehicle comprises: a dash panel 3 having a vertical wall 4 and an inclined part 5, front side frames 10 extending to a vehicle front side from the dash panel 3; a floor panel 6 which continues to the inclined part 5 to form a bottom face of a cabin 1; and a floor frame 11 extending to a rear side of the vehicle along the inclined part 5 and the floor panel 6 from rear ends of the front side frames 10. A fragile part 33 is arranged at the inclined part 5, and the fragile part 33 is arranged at only the vehicle front side of the center in the longitudinal direction of the inclined part 5.

Description

  The present invention relates to a front vehicle body structure of a vehicle, and more specifically, is installed so as to partition a vehicle compartment front portion and an engine room so that the vertical wall portion and the vertical wall portion are inclined downward toward the rear side. A dash panel having an inclined portion extending in the front-rear direction of the vehicle, a front side frame extending from the dash panel to the front side of the vehicle, and a floor panel that forms a bottom surface portion of the vehicle compartment continuously to the inclined portion; The present invention relates to a vehicle front body structure that includes a floor frame that extends from a rear end portion of the front side frame to the rear side of the vehicle along the inclined portion and the floor panel.

Conventionally, there is a structure shown in FIG. 6 as the front body structure of the vehicle of the above-described example.
In other words, a dash lower panel 63 is provided as a dash panel that partitions the front portion of the vehicle compartment 61 and the engine room 62 in the front-rear direction. The dash lower panel 63 is connected to the vertical wall portion 63A and the vertical wall portion 63A in a rearward direction. An inclined portion 63B (so-called toe board portion) extending in the front-rear direction of the vehicle is provided so as to be inclined downward toward the side.
In addition, a front side frame 64 that extends from the dash lower panel 63 to the front side of the vehicle is provided on both the left and right side portions of the engine room 62, and the bottom surface of the vehicle compartment 61 continues to the rear end portion of the inclined portion 63B. The floor panel 65 which forms a part is provided.

Further, a floor frame 66 extending from the rear end portion 64a of the front side frame 64 to the vehicle rear side along the surface of the inclined portion 63B and the floor panel 65 described above is provided. The floor frame 66 is formed in an inverted hat shape in cross section, and a closed cross section 67 continuous in the vehicle front-rear direction is formed between the floor frame 66 and the inclined portion 63B and the floor panel 65 described above.
In addition, a bead 68 extending in the front-rear direction of the vehicle along the extending direction of the floor frame 66 is integrally formed on the upper portion of the inclined portion 63B, and the bead 68 improves the rigidity of the inclined portion 63B. On the upper surface of the inclined portion 63B and the upper surface of the floor panel 65, a floor frame reinforcing member 69 that extends in the vehicle front-rear direction along the extending direction of the floor frame 66 is provided. The floor frame reinforcing member 69 has a hat shape in cross section, and a closed cross section 70 continuous in the front-rear direction of the vehicle is formed between the floor frame reinforcing member 69 and the inclined portion 63B and the floor panel 65 described above. Has been.
In the figure, 71A and 71B are tunnel portions, 72 is a wheel house formed integrally or integrally with the above-described dash lower panel 63, and 73 is a front mounted on a suspension cross mounting bracket 74 using a mounting member 75. It is a suspension cross, and the arrow F in the figure indicates the front of the vehicle.

  In the above-described front vehicle body structure of the vehicle, the bend mode of the front side frame 64 is controlled by the front side frame 64 by, for example, forming a bead that becomes a folding start (folding start point). Thus, the technical idea of absorbing the collision energy and securing the passenger's lower limb space (particularly the foot space) in the inclined portion 63B of the dash lower panel 63 is adopted.

  However, in a small vehicle, the length of the front side frame in the vehicle front-rear direction is short, and the amount of collision energy absorbed by the front side frame is reduced. For this reason, when the above technical idea is applied as it is, it is common to form the inclined portion of the dash lower panel firmly with a floor frame, a floor frame reinforcing member, a bead or the like. There was a problem of inviting an increase.

  By the way, Patent Document 1 is provided with a dash panel that partitions the engine room and the vehicle compartment in the front-rear direction, and the dash panel is continuous with the vertical wall part and the vehicle is inclined downward toward the rear side. In this structure, a bead is formed along the extending direction of the floor frame to increase the strength of the dash panel against the front impact load. However, the structure disclosed in Patent Document 1 is substantially equivalent to the conventional structure shown in FIG.

JP 2012-11959 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle front body structure that can secure an occupant leg space (foot space) during a frontal collision, particularly in a vehicle having a short front-rear length.

  The vehicle front body structure according to the present invention is installed so as to partition the vehicle compartment front portion and the engine compartment, and the vehicle longitudinal direction is such that the vertical wall portion and the vertical wall portion are inclined downward toward the rear side. A dash panel having an inclined portion extending inward, a front side frame extending from the dash panel toward the front side of the vehicle, a floor panel forming a bottom surface portion of the vehicle compartment continuously to the inclined portion, and the front side frame A vehicle front body structure including a floor frame extending from the rear end of the vehicle along the inclined portion and the floor panel to the rear side of the vehicle, wherein the inclined portion is provided with a fragile portion, the fragile portion The part is provided only on the vehicle front side from the center in the front-rear direction of the inclined part.

According to the above configuration, the weak portion is provided in the inclined portion of the dash panel, and the weak portion is provided only on the front side of the vehicle from the center in the front-rear direction of the inclined portion. A valley break can be generated at a desired position of the inclined portion, that is, a position where the weakened portion is provided at the time of a front collision.
Thereby, the deformation space of the front side frame is increased, and the front side frame is further bent and deformed, and the amount of collision energy absorbed by the front side frame can be improved. The occupant leg space (foot space) can be secured by causing the bending deformation to contribute to the collision energy absorption.
In particular, since the fragile portion is provided only on the vehicle front side from the center in the front-rear direction of the inclined portion, it is effective in securing the occupant leg space.

  In one embodiment of the present invention, a bead extending in the front-rear direction along the extending direction of the floor frame is formed in the inclined portion, and the weakened portion is a bead valley portion in which the height of the bead is partially low. It is comprised by.

  According to the said structure, since the said weak part was comprised in the bead trough part where the height of the said bead is partially low, this weak part can be implement | achieved by simple structure.

  In one embodiment of the present invention, a floor frame reinforcing member extending in the front-rear direction along the extending direction of the floor frame is provided on the upper surface of the inclined portion and the upper surface of the floor panel, and the front end of the floor frame reinforcing member is It is provided at a position corresponding to the bead valley.

According to the above configuration, the floor frame reinforcing member does not exist in the bead valley portion, whereas the floor frame reinforcing member exists in a portion from the bead valley portion to the floor panel on the rear side of the vehicle.
Thereby, the strength of the part from the bead valley part to the floor panel from the inclined part on the rear side of the vehicle is increased by the floor frame reinforcing member, that is, the strength of the part is set larger than the strength of the bead valley part. Has been.
For this reason, the bead valley part which is the said weak part is reliably bent ahead of the bending part formed between the said inclination part and the said floor panel by the load of the vehicle body front-back direction at the time of a front collision. Therefore, a passenger | crew lower limb space (foot space) can be ensured still more reliably.

  According to the present invention, the weak portion is provided in the inclined portion of the dash panel, and the weak portion is provided only on the vehicle front side from the center in the front-rear direction of the inclined portion. In a short vehicle, by generating a valley fold at a desired position of the inclined portion at the time of a front collision, the collision energy absorption amount by the front side frame is improved, and the bending deformation of the inclined portion also contributes to the collision energy absorption. Thus, there is an effect that a passenger's leg space (foot space) can be secured.

The side view which shows the front part vehicle body structure of the vehicle of this invention 1 is an enlarged side view of the main part of FIG. The perspective view which shows the structure of FIG. 2 in the state seen from the diagonally upper side by the compartment side The perspective view which shows the structure of FIG. 2 in the state seen from the engine room side diagonally downward Explanatory drawing showing the deformation state after a collision Side view showing a front vehicle body structure of a conventional vehicle

  Especially in vehicles with a short front-rear length, by generating a valley fold at a desired position of the inclined portion of the dash panel at the time of a front collision, the amount of collision energy absorbed by the front side frame is improved and the bending deformation of the inclined portion is also performed. Is also installed to partition the front part of the passenger compartment and the engine room for the purpose of securing the occupant leg space (foot space) by contributing to collision energy absorption. A dash panel having an inclined portion extending in the front-rear direction of the vehicle so as to incline downward toward the rear side, a front side frame extending from the dash panel to the front side of the vehicle, and the vehicle compartment continuously from the inclined portion. A floor panel that forms a bottom surface, and extends from the rear end of the front side frame to the rear side of the vehicle along the inclined portion and the floor panel. In the front vehicle body structure of the vehicle including the floor frame, the fragile portion is provided in the inclined portion, and the fragile portion is provided only on the vehicle front side from the center in the front-rear direction of the inclined portion. It was realized.

An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view of a front body structure of a vehicle shown in a partially sectioned state, FIG. 2 is an enlarged side view of an essential part of FIG. 1, and FIG. It is a perspective view which shows the structure in the state seen from the diagonally upper side by the compartment side.
1 and 2, a dash lower panel 3 is provided as a dash panel that partitions the front portion of the vehicle compartment 1 and the engine room 2 in the front-rear direction.
The above-described dash lower panel 3 has a vertical wall portion 4 extending in the vertical direction and the vehicle width direction, and an inclination extending in the front-rear direction of the vehicle so as to incline downward toward the vehicle rear side continuously from the lower end portion 4a of the vertical wall portion 4. Part 5 (so-called toe board).

Here, the above-described vertical wall portion 4 is formed of a general steel plate, while the above-described inclined portion 5 arranged in a low shape before and after the front is formed of a high-tensile steel plate (so-called high-tensile steel).
A floor panel 6 that extends substantially horizontally behind the rear end portion 5a of the inclined portion 5 is provided, and the floor panel 6 forms a bottom surface portion of the vehicle compartment 1.

As shown in FIGS. 1 and 2, tunnel portions 7 and 8 projecting toward the passenger compartment 1 are integrally or integrally formed at the center in the vehicle width direction of the above-described dash lower panel 3 and floor panel 6. The tunnel portion 7 on the dash lower panel 3 side and the tunnel portion 8 on the floor panel 6 side are formed to be continuous in the front-rear direction of the vehicle.
Further, wheel houses 9 and 9 are integrally or integrally formed on the left and right vehicle width direction outer sides of the above-described dash lower panel 3.

On the other hand, as shown in FIGS. 1 and 2, a pair of left and right front side frames 10 and 10 extending from the dash lower panel 3 to the front side of the vehicle on both the left and right sides of the engine room 2 (however, only one front side frame is shown in the drawings). Is shown).
The front side frame 10 is a vehicle body strength member having a closed cross section extending in the front-rear direction of the vehicle by joining and fixing the front side frame inner and the front side frame outer.

  As shown in FIG. 2, the front side frame 10 has an upper flange 10 a corresponding to the front shape of the lower portion of the vertical wall portion 4 and a lower flange 10 b corresponding to the front shape of the front portion of the inclined portion 5. The upper flange 10 a is joined and fixed to the vertical wall portion 4, and the lower flange 10 b is joined and fixed to the inclined portion 5.

As shown in FIGS. 1 and 2, a floor frame 11 extending from the rear end portion of the front side frame 10 to the rear side of the vehicle along the inclined portion 5 and the floor panel 6 is provided.
The cross section of the floor frame 11 in the vehicle width direction is formed in an inverted hat shape, and includes a bottom wall 11a, left and right side walls 11b, 11b, and left and right joint flange portions extending in the vehicle width direction from the upper ends of the left and right side walls 11b, 11b. 11c, 11c, and the left and right joint flange portions 11c, 11c are spot welded to the lower surface of the inclined portion 5 and the lower surface of the floor panel 6, so that the floor frame 11 is inclined from the rear end portion of the front side frame 10. It is configured to extend to the rear side of the vehicle along the portion 5 and the floor panel 6.
A floor frame closed section that is continuous in the front-rear direction of the vehicle is formed between the floor frame 11 and the inclined portion 5 and between the floor frame 11 and the floor panel 6 to improve the rigidity of the lower part of the vehicle body. It is comprised so that it may aim.

As shown in FIGS. 1 and 2, a suspension mounting bracket 12 having a substantially triangular shape in side view is connected and fixed so as to straddle between the front end portion and the front portion of the floor frame 11 described above. On the other hand, as shown in FIG. 1, a front suspension support member 13 that extends downward is integrally formed at the front end of the front side frame 10.
A front suspension cross 14 that supports an engine (or a power train) (not shown) is provided below the front side frame 10 described above. The front suspension cross 14 includes a side member 15 located on the front side, a side member 16 located on the rear side, and an intermediate cross member (not shown), and the front portion of the front side member 15 extends vertically. A connecting member 18 (so-called horn member) and a mount extending in the vertical direction are connected to the above-described support member 13 via an extending bracket 17, and a rear portion of the front side member 15 or an end portion in the vehicle width direction of the intermediate cross member. The rear side member 16 is coupled to the rear lower surface of the front side frame 10 via the portion 19, and the rear portion of the rear side member 16 is coupled to the horizontal lower surface of the suspension mounting bracket 12 via the mount member 20. Yes.

As shown in FIG. 2, the mounting member 20 is welded and fixed to the suspension mounting bracket 12 in advance and the inner pipe 23 provided in the rear end hole portion of the rear side member 16 via the outer pipe 21 and the bush 22. The bolt 27 inserted into the inner pipe 23 from below is fastened to the nut 24 in a state where the suspension pipe supporting members 25 and 26 are interposed above and below the inner pipe 23. Thus, the rear side member 16 is configured to be attached to the suspension mounting bracket 12.
And the above-mentioned front suspension cross 14 is a valley break of the weak part (bead valley part) provided in the inclined part 4 of the dash lower panel 3 mentioned later when the front collision load more than predetermined value is inputted at the time of the vehicle front collision. The mounting structure is set so as to be detached from the vehicle body before the deformation.

  Here, a sub-crash can 29 as a collision energy absorbing member is provided at the front end portion of the front side member 15 constituting the front suspension cross 14 via a set plate 28, and above the front suspension cross 14. A main crush can (not shown) as a collision energy absorbing member is attached to the front end portion of the front side frame 10 located at a position via a set plate 30.

As shown in FIGS. 2 and 3, the inclined portion 5 of the dash lower panel 3 has a floor frame 11 extending on both the passenger seat side (left side in FIG. 3) and the driver seat side (right side in FIG. 3). Upper convex beads 31 and 32 extending in the vehicle front-rear direction along the direction (vehicle front-rear direction) are integrally formed.
Between the rear end portion of the bead 31 located on the front side and the front end portion of the bead 32 located on the rear side, a bead valley portion 33 in which the height of the beads 31, 32 is partially low is formed. In this embodiment, as shown in FIGS. 2 and 3, a bead valley portion 33 is formed in which the heights of the beads 31 and 32 are partially zero.
The bead 31 located on the front side and the bead 32 located on the rear side are formed so as to be continuous in the front-rear direction of the vehicle via the bead valley portion 33.

  The bead valley portion 33 forms a fragile portion for generating a valley fold deformation at a desired position of the inclined portion 5 of the dash lower panel 3 at the time of a frontal collision of the vehicle. The valley portion 33 is provided only on the vehicle front side from the center in the front-rear direction of the inclined portion 5 described above.

In this embodiment, the above-described bead valley portion 33 is set at a position substantially opposite to the mount member 20 to which the front suspension cloth 14 is attached in the vertical direction. 20 is set to a portion facing the rear side surface of the outer peripheral portion of the inner pipe 23 constituting the upper and lower direction. Particularly, in a vehicle having a short front-rear length, a valley fold (see FIG. 5) is generated at a desired position of the inclined portion 5 of the dash lower panel 3 at the time of a front collision, that is, a position where a weak portion (bead valley portion 33) is provided. As a result, the deformation space of the front side frame 10 is increased, and the front side frame 10 is further bent and deformed, and the amount of collision energy absorbed by the front side frame 10 is improved. The fold deformation at the bead valley portion 33) is also contributed to the collision energy absorption, so that the occupant leg space (foot space) is secured.
Moreover, the above-mentioned weak part is formed by the bead valley part 33 so as to easily form the weak part.

Further, as shown in FIGS. 2 and 3, at the formation position of the bead 32, the upper surface of the inclined portion 5 and the upper surface of the floor panel 6 are arranged on the front and rear sides of the vehicle along the extending direction of the floor frame 11. A floor frame reinforcing member 34 extending in the direction is provided.
The floor frame reinforcing member 34 has an upper wall 34a, left and right side walls 34b, 34b, and joint flange portions 34c, 34c integrally formed from the lower ends of the side walls 34b, 34b in the vehicle width direction. The left and right joining flange portions 34c, 34c are joined and fixed to the inclined portion 5 and the floor panel 6 by spot welding. The bead 32 is covered by the front portion of the floor frame reinforcing member 34.

As shown in FIG. 2, the front end 34 d of the floor frame reinforcing member 34 described above is provided at a position corresponding to the rear end of the bead valley portion 33 formed in the inclined portion 5. Thereby, while the floor frame reinforcing member 34 does not exist in the bead valley portion 33, the floor frame reinforcing member is provided in the bent portion 35 (the end portion of the rear bead 32) between the inclined portion 5 and the floor panel 6. 34 is present.
That is, the strength of the bent portion 35 described above is enhanced by the floor frame reinforcing member 34, and the strength of the portion is formed so as to be greater than the strength of the bead valley portion 33. The inclined portion 5 described above is configured to be bent before the bent portion 35 formed between the inclined portion 5 and the floor panel 6.

  Further, as shown in FIG. 2, behind the front end 34 d of the floor frame reinforcing member 34, it extends rearward by a predetermined length from the upper surface of the inclined portion 5 to the upper surface of the floor panel 6 and separates the tunnel portions 7 and 8. The tibia protection member 36 is provided so as to cover substantially the entire width of the inclined portion 5 in the vehicle width direction on both the passenger seat side and the driver's seat side. Match the position. The above-described tibia protection member 36 is made of a synthetic resin such as polystyrene.

4 is a perspective view showing the structure of FIG. 2 as viewed obliquely from the engine room side.
As shown in FIG. 2 and FIG. 4, a floor frame is provided on the rear side of the connecting portion between the front side frame 10 and the floor frame 11 and substantially opposite to the bead valley portion 33 in the vertical direction. The weak part is formed in 11.

In this embodiment, a notch 11d is formed in the joint flange portion 11c of the floor frame 11 at a position in the vicinity of the bead valley portion 33, and the notch 11d is set as a fragile portion. The bead valley portion 33 is configured to be easily broken corresponding to the valley break.
In addition, the frame structure is configured to have a high strength immediately before the bead valley portion 33 described above. That is, the overlap portion 37 is formed by overlapping the rear end portion 10c of the front side frame 10 and the front end portion 11f of the floor frame 11 at a predetermined length L shown in FIG. The overlap 37 increases the strength.

Further, a rib 11e is integrally formed on the side wall 11b of the floor frame 11 immediately before the bead valley portion 33, and the strength of the floor frame 11 immediately before the bead valley portion 33 is enhanced by the rib 11e.
A large difference in strength is formed between the above-described strength-increasing structure by the overlap portion 37 and the rib 11e and a weakened structure by both the bead valley portion 33 and the notch 11d. 3 and the floor frame 11 are configured to be bent and deformed at desired portions.
In FIGS. 3 and 4, reference numeral 40 denotes a torque box. In the figure, arrow F indicates the front of the vehicle, arrow R indicates the rear of the vehicle, arrow IN indicates the inward in the vehicle width direction, arrow OUT indicates the outward in the vehicle width direction, and arrow UP indicates Shown above the vehicle.

The illustrated embodiment is configured as described above, and the operation will be described below.
When a front collision load of a predetermined value or more is input at the front collision of the vehicle, as shown by an arrow in FIG. 5, first, the front side frame 10 is compressed and deformed after the crash of the sub-crash can 29 and the main crash can. Then, the front suspension cross 14 is detached from the vehicle body. By the separation of the front suspension cross 14, the front suspension cross 14 does not hinder the bending of the inclined portion 5 of the dash lower panel 3.
When the front side frame 10 is further retracted after the front suspension cross 14 is detached, the dash lower panel 3 starts from the state before the collision indicated by the phantom line in FIG. As shown by the solid line in FIG.

The dash lower panel 3 retreats due to the valley bending deformation of the inclined portion 5, thereby increasing the deformation space of the front side frame 10, and the front side frame 10 is further bent and deformed, and the amount of collision energy absorbed is improved. .
Further, by forming the inclined portion 5 from a high-tensile steel plate and deforming the inclined portion 5 at the bead valley portion 33, the valley bent deformation of the inclined portion 5 can also contribute to collision energy absorption. The formation position of the above-described bead valley portion 33 is set on the front side of the vehicle with respect to the center of the inclined portion 5 in the front-rear direction, so that the occupant leg space (foot space) can be secured.

  As described above, the vehicle body structure of the vehicle according to the above embodiment is installed so as to partition the front portion of the vehicle compartment 1 and the engine room 2, and continues downward from the vertical wall 4 and the vertical wall 4 toward the rear side. A dash panel (see the dash lower panel 3) having an inclined portion 5 extending in the front-rear direction of the vehicle so as to incline, a front side frame 10 extending from the dash panel (dash lower panel 3) to the front side of the vehicle, and the inclined portion 5, a floor panel 6 that forms a bottom surface portion of the passenger compartment 1 and a floor frame that extends from the rear end portion of the front side frame 10 to the rear side of the vehicle along the inclined portion 5 and the floor panel 6. 11, wherein the inclined portion 5 is provided with a fragile portion (see the bead valley portion 33), and the fragile portion (bead valley portion 33) is the front-rear direction of the inclined portion 5. Those provided only on the front side of the vehicle than the center (see FIG. 2).

According to this configuration, the fragile portion (bead valley portion 33) is provided in the inclined portion 5, and the fragile portion (bead valley portion 33) is provided only on the vehicle front side from the center in the front-rear direction of the inclined portion 5. Therefore, particularly in a vehicle with a short front-rear length, a trough breaks at the desired position of the inclined portion 5 of the dash panel (dash lower panel 3), that is, the position where the fragile portion (bead valley portion 33) is provided at the time of the front collision. Can be generated.
Accordingly, the amount of collision energy absorbed by the front side frame 10 can be improved, and the bending deformation at the fragile portion (bead valley portion 33) of the inclined portion 5 also contributes to the collision energy absorption. Space (foot space) can be secured.
In particular, since the fragile portion (bead valley portion 33) is provided only on the front side of the vehicle with respect to the center of the inclined portion 5 in the front-rear direction, it is effective in securing the occupant leg space.
In addition, beads 31 and 32 extending in the front-rear direction along the extending direction of the floor frame 11 are formed on the inclined portion 5, and the weakened portion is a bead valley in which the height of the beads 31 and 32 is partially low. (In this embodiment, the bead valley portion 33 in which the height of the beads 31 and 32 is zero) (see FIGS. 2 and 3).

According to this configuration, since the weak portion is configured by the bead valley portion 33 where the height of the beads 31, 32 is partially low, the weak portion (bead valley portion 33) can be realized with a simple configuration. Can do.
Further, a floor frame reinforcing member 34 extending in the front-rear direction along the extending direction of the floor frame 11 is provided on the upper surface of the inclined portion 5 and the upper surface of the floor panel 6, and the front end 34 d of the floor frame reinforcing member 34 is the bead. It is provided at a position corresponding to the valley 33 (see FIGS. 2 and 3).

According to this configuration, the floor frame reinforcing member 34 does not exist in the bead valley portion 33, while the floor frame reinforcing member 34 is provided at a portion from the inclined portion on the rear side of the vehicle to the floor panel 6 from the bead valley portion. Exists.
Thereby, the strength of the portion from the bead valley portion to the floor panel 6 from the inclined portion 5 on the rear side of the vehicle is increased by the floor frame reinforcing member 34, that is, the strength of the portion is the strength of the bead valley portion 33. Is set larger than.
For this reason, the bead valley portion 33 that is the fragile portion is surely ahead of the bent portion 35 formed between the inclined portion 5 and the floor panel 6 by the load in the longitudinal direction of the vehicle body at the time of the front collision. Bends. Therefore, a passenger | crew lower limb space (foot space) can be ensured still more reliably.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The dash panel of the present invention corresponds to the dash lower panel 3 of the embodiment,
Similarly,
The weak part corresponds to the bead valley part 33,
The present invention is not limited to the configuration of the above-described embodiment.
For example, the thickness of the inclined portion in the dash panel may be changed so that the thin portion is set as the fragile portion.

  As described above, the present invention is installed so as to partition the front part of the vehicle compartment and the engine room, and in the longitudinal direction of the vehicle so as to incline downward toward the rear side continuously with the vertical wall part and the vertical wall part. A dash panel having an inclined portion that extends, a front side frame that extends from the dash panel to the front side of the vehicle, a floor panel that forms a bottom surface portion of the vehicle compartment continuously to the inclined portion, and the front side frame This is useful for a vehicle front body structure including a floor frame that extends from a rear end portion to the rear side of the vehicle along the inclined portion and the floor panel.

1 ... Vehicle compartment 2 ... Engine room 3 ... Dash lower panel (dash panel)
4 ... Vertical wall portion 5 ... Inclined portion 6 ... Floor panel 10 ... Front side frame 11 ... Floor frame 31, 32 ... Bead 33 ... Bead valley portion (fragile portion)
34 ... Floor frame reinforcement member

Claims (3)

A dash panel that is installed so as to partition the front part of the passenger compartment and the engine room, and has a vertical wall part and an inclined part extending in the front-rear direction of the vehicle so as to incline downward toward the rear side continuously from the vertical wall part;
A front side frame extending from the dash panel to the front side of the vehicle;
A floor panel that continuously forms the bottom of the vehicle compartment in succession to the inclined portion;
A vehicle front body structure including a floor frame extending from a rear end portion of the front side frame to the rear side of the vehicle along the inclined portion and the floor panel,
The inclined part is provided with a fragile part,
The fragile portion is a vehicle front body structure provided only on the front side of the vehicle with respect to the center of the inclined portion in the front-rear direction. A bead extending in the front-rear direction along the extending direction of the floor frame is formed on the inclined portion,
The vehicle front body structure according to claim 1, wherein the weakened portion is constituted by a bead valley portion in which the height of the bead is partially low. A floor frame reinforcing member extending in the front-rear direction along the extending direction of the floor frame is provided on the upper surface of the inclined portion and the upper surface of the floor panel,
The vehicle front body structure according to claim 2, wherein a front end of the floor frame reinforcing member is provided at a position corresponding to the bead valley.

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