Vehicle body front structure

Abstract

To provide a vehicle body front structure which can inhibit deformation of a vehicle body even in either of a full lap front collision and a small overlap front collision.SOLUTION: A vehicle body front structure includes: a pair of left and right front side frames 4 extending in a front-back direction of a vehicle body 1; a pair of upper side frames 5 disposed at both sides of a power unit room 2 and extending along the power unit room 2; a radiator support 7 disposed at a front part of the power unit room 2 and joint to front ends of the pair of upper side frames 5; and a lower frame 20 disposed below the pair of front side frames 4 and supported by each front side frame 4. The vehicle body front structure has: a pair of lower side frame extending members 25 which extend forward from a front end of the lower frame 20 and in each of which a tip protrudes to the front side relative to the radiator support 7; and a pair of gussets which extend forward from the front end of the lower frame 20 and in which tips are disposed at the outer side in a vehicle width direction relative to tips of the pair of front side frames 4.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle front body structure having a plurality of frames disposed around a radiator support and a lower frame disposed below a front side frame. [Background technology]

[0002] In recent years, there has been a demand for improved safety in the body structure of an automobile or the like against an offset collision in which the vehicle partially collides with an obstacle. In particular, there has been a demand for improved performance against a so-called small overlap frontal collision in which an obstacle collides only with an end portion of the vehicle in the width direction.

[0003] Various technologies have been proposed as vehicle body front structures that reduce deformation of the vehicle body in such a small overlap frontal collision. For example, Patent Document 1 (JP 2014-104898 A) discloses a vehicle body front structure in which each front side member (front side frame) and a suspension member are connected by a V-shaped brace. With this configuration, the vehicle body front structure of Patent Document 1 suppresses the front side frame from falling inward in the vehicle width direction during a small overlap collision (small overlap frontal collision). As a result, the vehicle body front structure of Patent Document 1 generates a lateral force on the vehicle during a small overlap collision, making it possible to reduce deformation of the vehicle body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication 2014-104898 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of the structure disclosed in Patent Document 1, for example, depending on the magnitude of the impact during a small overlap frontal collision, there is a risk that the lateral force generated on the vehicle body may be insufficient. In such a case, the collision load may be concentrated on the small overlap part (the outer part of the front side frame in the vehicle width direction) at the front of the vehicle body, and the deformation of the vehicle body may not be sufficiently reduced. Also, even in the case of a full-overlap frontal collision, depending on the magnitude of the impact, there is a risk that the buckling deformation of the V-shaped brace may not be able to sufficiently reduce the deformation of the vehicle body.

[0006] The present invention has been made in consideration of the above circumstances, and has an object to provide a front vehicle body structure that can suppress deformation of the vehicle body in both a full-overlap frontal collision and a small overlap frontal collision. [Means for solving the problem]

[0007] A vehicle front structure according to one embodiment of the present invention comprises a pair of left and right front side frames extending in the fore-and-aft direction of the vehicle body, a pair of upper side frames arranged on both sides of a power unit room in the vehicle width direction and extending along the power unit room, a radiator support arranged in front of the power unit room and joined to front ends of the pair of upper side frames, and a lower frame arranged at the lower part of the pair of front side frames and supported by the pair of front side frames, and has a pair of lower side frame extension members extending from the front ends of the lower frames toward the front of the vehicle body and having tip portions protruding forward further than the radiator support, and a pair of gussets extending from the front end of the lower frame toward the front of the vehicle body and having tip portions arranged outboard in the vehicle width direction than the tips of the pair of front side frames. Effect of the Invention

[0008] According to the vehicle body front structure of the present invention, deformation of the vehicle body can be suppressed in both a full-overlap frontal collision and a small overlap frontal collision. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a frame structure of a front part of a vehicle body. [Diagram 2] An exploded perspective view showing the frame structure of the front body [Diagram 3] A side view showing the frame structure at the front of the vehicle [Figure 4] Front view showing the frame structure at the front of the vehicle [Diagram 5] A side view showing the behavior of the front frame of a vehicle from the early to mid-stages of a full-wrap frontal collision [Figure 6] A side view showing the behavior of the front frame of the vehicle during the final stages of a full-wrap frontal collision. [Figure 7] Plan view showing the behavior of the front frame of the vehicle during the initial stage of a small overlap frontal collision [Figure 8] Plan view showing the behavior of the front frame of the vehicle in the middle of a small overlap frontal collision [Figure 9] Plan view showing the behavior of the front frame of the vehicle at the end of a small overlap frontal collision DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0011] In the drawings used in the following description, the scale of each component is different so that each component can be recognized on the drawing. Therefore, the present invention is not limited to the quantity, shape, and size ratio of the components and the relative positional relationship of the components shown in these drawings.

[0012] As an example of a vehicle body front structure in this embodiment, a configuration of a vehicle body front of a vehicle having a power unit such as an electric motor mounted in front of a cabin will be described. In the following description, when "joining" is mentioned, the joining method is performed using a joining means such as fusion joining or mechanical joining.

[0013] As shown in FIG. 1, a vehicle body 1 has a power unit room 2 in the front portion.

[0014] The vehicle body 1 has frames that form a power unit room 2, such as a toe board 3, a pair of front side frames 4, a pair of upper side frames 5, a pair of suspension towers 6, and a radiator support 7.

[0015] The toe board 3 extends in the vehicle width direction as a partition that separates the cabin 8 from the power unit room 2. Both ends of the toe board 3 in the vehicle width direction are joined to a pair of left and right front pillars 9 that constitute the vehicle body 1. In addition, the upper end of the toe board 3 is joined to a bulkhead 10 that extends in the vehicle width direction along the toe board 3.

[0016] The pair of front side frames 4 extend forward of the vehicle body 1 from the lower side of the toe board 3 outside the center of the toe board 3 in the vehicle width direction.

[0017] Each of these front side frames 4 is constructed by connecting a plurality of frame members.

[0018] More specifically, each front side frame 4 is configured to have, for example, a front side frame main body 4a and a crash box 4b. The front side frame main body 4a and the crash box 4b each have a substantially rectangular cross section.

[0019] The front side frame body 4a is provided at its rear end with a torque box 11. The rear end of the front side frame 4 is joined to the front end of a side sill 12 and the front end of a floor side frame 13 via the torque box 11.

[0020] 2 and 3, a tip of the front side frame main body 4a is joined to a radiator support side 7c of the radiator support 7, which will be described later. The joining position of the tip of the front side frame main body 4a to the radiator support side 7c is set slightly above the center in the up-down direction of the radiator support side 7c.

[0021] As shown in FIG. 3, the crash box 4b is connected to the tip of the front side frame main body 4a via a radiator support side 7c.

[0022] Specifically, the crash box 4b has a mounting flange 15. The mounting flange 15 is formed at the rear end of the crash box 4b.

[0023] The mounting flange 15 is positioned relative to the radiator support side 7c that faces the tip of the front side frame main body 4a. In this state, the mounting flange 15 of the crash box 4b is joined to the radiator support side 7c. As a result, the crash box 4b extends further forward than the radiator support side 7c toward the front of the vehicle body 1.

[0024] The front ends of the crash boxes 4b thus extended are joined to a bumper beam 16 that extends in a curved manner in the vehicle width direction (see FIG. 1).

[0025] With this configuration, each front side frame 4 functions as an energy absorbing member that absorbs the collision load during a full-overlap frontal collision and distributes the collision load to the side sill 12 and floor side frame 13 via the torque box 11.

[0026] The pair of upper side frames 5 are disposed on both sides of the power unit room 2 in the vehicle width direction. Each upper side frame 5 extends from the bulkhead 10 toward the front of the vehicle body along the power unit room 2. Each upper side frame 5 is curved inward in the vehicle width direction from a midpoint of each upper side frame 5 toward the front of the vehicle body. The front ends of each upper side frame 5 are joined to both sides of a radiator support upper 7a described later.

[0027] That is, each upper side frame 5 is curved so as to gradually narrow inward in the vehicle width direction from the rear end to the front end.

[0028] A pair of suspension towers 6 are provided between each front side frame 4 and each upper side frame 5. Each suspension tower 6 is formed to protrude inward in the vehicle width direction of the power unit room 2. A suspension device (not shown) is attached inside each of the suspension towers 6. The suspension device has an upper portion supported by the suspension tower 6. A connecting member 28, which will be described later, is disposed in the front of each suspension tower 6 configured in this manner.

[0029] 1 and 4, the radiator support 7 is disposed approximately in the center of the front part of the power unit room 2 of the vehicle body 1. The radiator support 7 is formed in a substantially rectangular frame shape when viewed from the front.

[0030] Specifically, the radiator support 7 is configured to have a pair of upper and lower radiator supports 7a and 7b, and a pair of left and right radiator side supports 7c.

[0031] The upper radiator support 7a and the lower radiator support 7b are formed, for example, in a generally hat-shaped cross section that protrudes upward. The upper radiator support 7a and the lower radiator support 7b face each other at a predetermined distance in the vertical direction of the vehicle body.

[0032] The radiator support upper 7a extends in the vehicle width direction at the front of the vehicle body as shown in Figures 1 and 2. Both ends of the radiator support upper 7a in the vehicle width direction are joined to the front ends of the upper side frames 5 as described above.

[0033] The radiator support lower 7b extends in the vehicle width direction below the radiator support upper 7a. The upper surface of the radiator support lower 7b is inclined slightly upward toward the front.

[0034] The pair of radiator support sides 7c are opposed to each other with a predetermined gap therebetween in the vehicle width direction. As shown in Fig. 2, each radiator support side 7c has, for example, a substantially L-shaped cross section having wall panels at the front and on the outer sides in the vehicle width direction.

[0035] Specifically, the radiator support side 7c is configured to have a front wall plate 14a and a side wall plate 14b.

[0036] The front wall plate 14a extends in the vertical direction. As described above, the tip of the front side frame main body 4a is joined to the back surface of the front wall plate 14a. Moreover, the rear end of the crash box 4b is joined to the front surface of the front wall plate 14a.

[0037] The side wall plate 14b is disposed in an L-shape from the outer edge of the front wall plate 14a in the vehicle width direction toward the rear. A radiator support side flange 17 extending outward in the vehicle width direction is provided on the rear edge of the side wall plate 14b (see FIGS. 2 and 4).

[0038] The spacing between the inner sides of each radiator support side 7c configured in this manner in the vehicle width direction is set to be approximately equal to the spacing between the outer sides of a pair of lower side frame extension members 25 described below in the vehicle width direction. The upper and lower ends of each radiator support side 7c are joined to both sides of the upper radiator support 7a and the lower radiator support 7b.

[0039] With this configuration, the radiator support 7 functions as a support member that supports a radiator (not shown) and a plurality of frame members extending in the front-rear direction of the vehicle body.

[0040] As shown in Fig. 2, a lower frame 20 is disposed at the bottom of the power unit room 2 configured as described above. The lower frame 20 is set to have a height substantially equal to that of the radiator support lower 7b when viewed from the front, for example. The lower frame 20 has a plurality of frames.

[0041] More specifically, the lower frame 20 is configured to have a pair of left and right lower side frames 21, and a pair of front and rear cross members 22 and a front cross member 23. The pair of lower side frames 21 and the pair of cross members 22, 23 each have a generally rectangular cross section.

[0042] The pair of lower side frames 21 extend in the front-rear direction of the vehicle body at a predetermined interval in the vehicle width direction. Each lower side frame 21 is disposed on the inner side in the vehicle width direction than the front side frame 4. Furthermore, a suspension arm 24 is attached to the outer surface in the vehicle width direction of each lower side frame 21. These suspension arms 24 are supported by the lower frame 20 so as to be freely swingable in the up-down direction.

[0043] A pair of rear cross members 22 and a front cross member 23 are disposed at the rear and front of the lower frame 20 at a predetermined distance and extend inward in the vehicle width direction of each lower side frame 21.

[0044] A pair of left and right support members 27a and 27b protrude from both sides in the vehicle width direction of the rear cross member 22 and the front cross member 23, respectively.

[0045] 2, the pair of support members 27a, together with the rear cross member 22, form the rear portion of the lower frame 20. These support members 27a extend outward in the vehicle width direction of the lower side frame 21. The length by which the support members 27a extend outward in the vehicle width direction is set to a length that faces the bottom surface of the front side frame 4 disposed outside the lower side frame 21. In other words, each support member 27a is set to a length that allows the upper surface of each support member 27a to abut against the bottom surface of the front side frame 4.

[0046] 2, the pair of support members 27b, together with the front cross member 23, form the front portion of the lower frame 20. These support members 27b extend outward in the vehicle width direction of the lower side frame 21. The length by which the support members 27b extend outward in the vehicle width direction is set to a length that faces the bottom surface of the front side frame 4 disposed outside the lower side frame 21.

[0047] Each of the support members 27b includes a connecting member 28 at the top of the support member 27b.

[0048] 2 and 3, each connecting member 28 extends upward from each of the support members 27b. These connecting members 28 are disposed at the front of the suspension tower 6.

[0049] Specifically, each connecting member 28 extends upward with the bottom surface of the connecting member 28 joined to the upper surface of the supporting member 27b. The length of the upward extension of each connecting member 28 is set to a length that allows the connecting member 28 to abut against the bottom surface of the front side frame 4 when the supporting member 27a is abutted against the bottom surface of the front side frame 4.

[0050] The lower frame 20 is supported by each front side frame 4 by joining the upper surfaces of the support members 27a and connecting members 28 to the bottom surfaces of the front side frames 4 in abutting relation thereto. A power unit (not shown) is supported on the upper surface of the front cross member 23 via, for example, a motor mount (not shown).

[0051] The lower frame 20 configured in this manner is provided at its front portion with a pair of left and right lower side frame extension members 25 and a pair of left and right gussets 29.

[0052] As shown in Fig. 4, the pair of lower side frame extension members 25 are disposed inward in the vehicle width direction from the front side frame 4. As shown in Fig. 3, each lower side frame extension member 25 extends from the front end of the lower frame 20 toward the front of the vehicle body. Then, a tip portion of each lower side frame extension member 25 passes inside the frame of the radiator support 7 and protrudes forward beyond the radiator support 7.

[0053] More specifically, each lower side frame extension member 25 extends obliquely upward from the rear end to the front end of the lower side frame extension member 25. As shown in Figures 3 and 4, the tip portions of these lower side frame extension members 25 pass through the upper surface of the radiator support lower 7b of the radiator support 7 and the inside of each of the radiator support side 7c in the vehicle width direction. Each of the tip portions of the lower side frame extension members 25 that pass within the frame of the radiator support 7 in this manner protrudes forward beyond the radiator support 7.

[0054] Each of the lower side frame extension members 25 thus extended is joined within the frame of the radiator support 7 with the lower surface of the lower side frame extension member 25 abutting against the upper surface of the radiator support lower 7b. Note that the joining means for joining each of the lower side frame extension members 25 to the radiator support lower 7b may be a bracket.

[0055] Each of the ends of the lower side frame extension members 25 is joined to a lower beam 26 that extends and curves in the vehicle width direction (see FIG. 1).

[0056] With these configurations, the lower side frame extension member 25 is able to stiffen the front part of the vehicle body by the reaction force of the lower frame 20 supported by the front side frame 4 in the event of a full-overlap frontal collision.

[0057] 2, the pair of gussets 29 extend from the front end of the lower frame 20 toward the front of the vehicle body in front of the connecting member 28. The tip of each gusset 29 is disposed outward in the vehicle width direction from the tip of the front side frame 4.

[0058] More specifically, the rear portion of each gusset 29 is joined to the outer side of the lower side frame extension member 25 in the vehicle width direction and to the front surface of the support member 27b. In this manner, each gusset 29 joined to the front end of the lower frame 20 extends toward the radiator support side flange 17. At the tip of each of these gussets 29, for example, a mounting flange 30 is formed as shown in Figs. 2 and 3.

[0059] The tip of each gusset 29 is joined to the radiator support side flange 17 with the mounting flange 30 abutting against the back surface of the radiator support side flange 17 .

[0060] As a result, the tip of each gusset 29 is disposed outward in the vehicle width direction from the tip of the front side frame 4 and further rearward in the vehicle body from the tips of the front side frame 4 and the lower side frame extension member 25 (see Figs. 3 and 4). In addition, the tip of each gusset 29 is disposed lower than the tip of the front side frame 4 and higher than the tip of the lower side frame extension member 25 in the vertical direction of the vehicle body 1, as shown in Fig. 4.

[0061] In other words, the tip of each gusset 29 is arranged between the tip of the front side frame 4 and the tip of the lower side frame extension member 25 in the vertical direction of the vehicle body, and is arranged outboard of the tip of the front side frame 4 in the vehicle width direction.

[0062] With these configurations, in the event of a full-overlap frontal collision, the gusset 29 is able to stiffen the front part of the vehicle body by the reaction force of the lower frame 20 supported by the front side frame 4. Furthermore, the gusset 29 functions as a starting point for applying a lateral force to the vehicle body 1 in the event of a small overlap frontal collision.

[0063] According to this embodiment, the vehicle body front structure includes a pair of left and right front side frames 4 extending in the front-rear direction of the vehicle body 1, a pair of upper side frames 5 arranged on both sides of the power unit room 2 in the vehicle width direction and extending along the power unit room 2, a radiator support 7 arranged in front of the power unit room 2 and joined to the front ends of the pair of upper side frames 5, and a lower frame 20 arranged under the pair of front side frames 4 and supported by the pair of front side frames 4, the vehicle body front structure includes a pair of lower side frame extension members 25 extending from the front end of the lower frame 20 toward the vehicle body front and having tip ends protruding further forward than the radiator support 7, and a pair of gussets 29 extending from the front end of the lower frame 20 toward the vehicle body front and having tip ends disposed outward in the vehicle width direction than the tips of the pair of front side frames 4. With this configuration, the vehicle body front structure can suppress deformation of the vehicle body 1 in both a full overlap frontal collision and a small overlap frontal collision.

[0064] That is, the vehicle front body structure includes a lower frame 20 supported by a pair of front side frames 4. The front end of the lower frame 20 has a pair of lower side frame extension members 25 and a pair of gussets 29 for stiffening the front part of the vehicle body.

[0065] 5 and 6, when the vehicle body 1 undergoes a full-overlap frontal collision against a barrier-like obstacle B, the lower side frame extension members 25 and the gussets 29 stiffen the area in front of the lower frame 20 by the reaction force of the lower frame 20 supported by the front side frame 4. Due to the action of the lower side frame extension members 25 and the gussets 29, the vehicle body front structure of this embodiment can generate a higher resistance in the vehicle body 1 compared to a vehicle body front structure having only the front side frames 4.

[0066] Specifically, the lower side frame extension member 25, which stiffens the front of the vehicle body together with the front side frame 4, deforms together with the crash boxes 4b from the initial to intermediate stages of a full-wrap frontal collision (see FIG. 5). This allows the lower side frame extension member 25, together with the crash boxes 4b, to absorb the collision load from the initial to intermediate stages of a full-wrap frontal collision.

[0067] Then, at the end of the full-wrap frontal collision after the crash boxes 4b are completely deformed (see FIG. 6), the gussets 29 deform together with the front side frame 4 and the lower side frame extension member 25. This allows the gussets 29 to absorb the collision load of the front part of the vehicle body together with the front side frame 4 and the lower side frame extension member 25.

[0068] In this state, the lower side frame extension members 25 and the gussets 29 transmit the collision energy from the front of the vehicle body to the lower frame 20. Then, a part of the collision energy transmitted to the lower frame 20 is transmitted to each of the front side frames 4 supporting the lower frame 20.

[0069] In other words, the lower frame 20 can disperse the collision energy transmitted from each lower side frame extension member 25 and each gusset 29 to each of the front side frames 4.

[0070] 7, 8 and 9, when the left end of the vehicle body 1 collides, for example, in a small overlap frontal collision with a pole-shaped obstacle P, the gusset 29 stiffens the region on the outer side of the front side frame 4 in the vehicle width direction by the reaction force of the lower frame 20. As a result, the gusset 29 generates a reaction force for suppressing deformation of the region on the outer side of the front side frame 4 in the vehicle width direction.

[0071] More specifically, the tip of the gusset 29 is disposed on the outer side in the vehicle width direction than the tip of the front side frame 4. Therefore, the gusset 29 can stiffen the area on the outer side in the vehicle width direction than the front side frame 4 at the initial stage of a small overlap frontal collision (see FIG. 7).

[0072] Furthermore, in the middle of a small overlap frontal collision (see Figure 8), the collision load that is not absorbed by the resistance of the gusset 29 is converted into a yawing moment that rotates the vehicle body 1 to the right, with the contact point between the pole-shaped obstacle P and the gusset 29 as the fulcrum.

[0073] Then, in the final stage of the small overlap frontal collision (see FIG. 9), due to a clockwise yawing moment, the pole-shaped obstacle P passes through the upper side frames 5 while being guided to the outer side of the upper side frames 5 in the vehicle width direction. As a result, the vehicle body 1 is released from the collision load of the pole-shaped obstacle P.

[0074] As a result, the vehicle body front structure of this embodiment can suppress deformation of the vehicle body 1 in both a full-overlap frontal collision and a small-overlap frontal collision.

[0075] In addition, each of the lower side frame extension members 25 extends obliquely upward from the rear end to the front end of the lower side frame extension member 25. Each of the extended lower side frame extension members 25 is joined to the inside of the frame of the radiator support 7. The middle portion of the lower side frame extension member 25 thus extended is bent downward of the vehicle body 1 by the collision load during a full-overlap frontal collision (see FIGS. 5 and 6).

[0076] More specifically, each of the lower side frame extension members 25 is joined within the frame of the radiator support 7 in a state inclined upward toward the front of the vehicle body. Due to the inclination of the lower side frame extension members 25, for example, in a full-overlap frontal collision, each of the lower side frame extension members 25 can concentrate a collision load on the middle portion of each lower side frame extension member 25. Then, the collision load concentrated on the middle portion of each lower side frame extension member 25 can deform the lower side frame extension member 25 toward the bottom of the vehicle body 1, starting from the middle portion of the lower side frame extension member 25.

[0077] That is, in a full-wrap frontal collision, a vehicle front structure equipped with the lower side frame extension member 25 can more effectively absorb the collision load due to deformation of the lower side frame extension member 25. Note that, in order to appropriately deform the middle portion of the lower side frame extension member 25 during a collision, various conditions such as the inclination angle of the lower side frame extension member 25, the plate thickness and shape of the lower side frame extension member 25, etc. are determined in advance through experiments, simulations, etc.

[0078] Furthermore, connecting members 28 for connecting the lower frame 20 to each of the front side frames 4 are disposed in front of each suspension tower 6. The movement of each of the connecting members 28 disposed in this manner toward the rear of the vehicle body is restricted by the suspension towers 6. Therefore, each connecting member 28 can increase the reaction force of the lower frame 20 against a collision load from the front of the lower frame 20. As a result, the vehicle body front structure including the connecting members 28 can generate a higher resistance force on the vehicle body 1 in a full-wrap frontal collision.

[0079] Moreover, each gusset 29 is disposed on the outer side of the lower side frame extension member 25 in the vehicle width direction and in front of the connecting member 28. More specifically, the rear part of each gusset 29 is joined to the front surface of the support member 27b. Therefore, the movement of each of the support members 27b toward the rear of the vehicle body is restricted by the suspension tower 6, similar to the connecting member 28 connected to the upper surface of each support member 27b. This allows each gusset 29 to obtain a high reaction force from the support member 27b in both a full-overlap frontal collision and a small-overlap frontal collision. In other words, the vehicle body front structure provided with the gusset 29 can generate a higher reaction force on the vehicle body 1 in both a full-overlap frontal collision and a small-overlap frontal collision.

[0080] Further, the tip of each gusset 29 is disposed below the tip of the front side frame 4 and above the tip of the lower side frame extension member 25 .

[0081] More specifically, the tip of each gusset 29 is disposed between the tip of the front side frame 4 and the tip of the lower side frame extension member 25 in the vertical direction of the vehicle body, and is disposed outward in the vehicle width direction from the tip of the front side frame 4. In other words, the tips of each gusset 29, together with the tip of the front side frame 4 and the tip of the lower side frame extension member 25, are disposed in a dispersed manner around the radiator support 7.

[0082] Therefore, each gusset 29 arranged in this manner, together with the front side frame 4 and the lower side frame extension member 25, can exert sufficient resistance over a wide area of ​​the front of the vehicle body in the event of a frontal collision such as a full-wrap frontal collision.

[0083] The vehicle body front structure in this embodiment is also applicable, for example, to an offset frontal collision which is between a full-overlap frontal collision and a small overlap frontal collision.

[0084] The invention described in the above embodiment is not limited to those forms, and various modifications can be made in the implementation stage without departing from the gist of the invention. Furthermore, the above forms include inventions at various stages, and various inventions can be extracted by appropriate combinations of the disclosed constituent elements.

[0085] Furthermore, if some of the constituent elements are deleted from all of the constituent elements shown in the above embodiment, and the stated problem can be solved and the stated effect can be obtained, the configuration from which these constituent elements are deleted can be extracted as an invention. [Explanation of symbols]

[0086] 1. Vehicle body 2. Power unit room 3. Toe board 4. Front side frame 4a Front side frame body 4b···Crash box 5. Upper side frame 6. Suspension tower 7 Radiator support 7a Radiator support upper 7b Radiator support lower 7c Radiator support side 8. Cabin 9. Front pillar 10. Bulkhead 11 Torque box 12. Side sill 13 Floor side frame 14a Front wall panel 14b...Side wall plate 15...Flange 16 Bumper beam 17 Radiator support side flange 20 Lower frame 21 Lower side frame 22 Rear cross member 23 Front cross member 24···Suspension arm 25 Lower side frame extension member 26 Lower beam 27a Support member 27b Support member 28...Connecting member 29. Gusset 30...Flange B: Barrier-like obstacle P···Pole-shaped obstacle

Claims

1. A pair of left and right front side frames extending in the front-rear direction of the vehicle body; A pair of upper side frames are arranged on both sides of the power unit room in a vehicle width direction and extend along the power unit room; a radiator support disposed in a front portion of the power unit room and joined to front ends of the pair of upper side frames; a lower frame disposed under the pair of front side frames and supported by the pair of front side frames, a pair of lower side frame extension members extending from a front end of the lower frame toward a front side of a vehicle body and having tip portions protruding forward beyond the radiator support; a pair of gussets extending from the front end of the lower frame toward the front of the vehicle body and having tips disposed widthwise outward of the tips of the pair of front side frames.

2. 2. The vehicle front structure according to claim 1, wherein the lower side frame extension member is disposed inward in the vehicle width direction from the front side frame, and a tip of the lower side frame extension member is inclined upward as it extends forward and passes within the frame of the radiator support.

3. a suspension tower that supports a suspension device between the front side frame and the upper side frame; 3. The vehicle front body structure according to claim 1, further comprising: a connecting member that connects the lower frame to the front side frame at a front portion of the suspension tower.

4. 4. The vehicle front body structure according to claim 3, wherein a rear portion of the gusset is disposed on an outer side of the lower side frame extension member in the vehicle width direction and in front of the connecting member.

5. 3. The vehicle front structure according to claim 2, wherein a tip of the gusset is disposed below a tip of the front side frame and above a tip of the lower side frame extension member in the vertical direction of the vehicle body.

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