JP7181329B2 - Body front structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body front structure that absorbs collision energy in an SOT (Small Overlap) collision outside the front end portions of front side frames on both sides of the vehicle body.

An SOT collision is a collision with a small amount of overlap, such as corner-to-corner collision with an opponent vehicle. As a vehicle body front structure that absorbs collision energy in an SOT collision, there is a structure described in Patent Document 1, for example. In this structure, the front parts of upper members arranged on both front sides of the vehicle body are superimposed and joined to the lower surfaces of the front end parts of the front side frames arranged inside the upper members in the vehicle width direction.

Japanese Patent No. 4875508 Japanese Patent No. 6546065

In the vehicle having the structure disclosed in Patent Document 1, the front portion of the upper member is overlapped and joined to the lower surface of the front end portion of the front side frame (also referred to as a frame), so that the front end of the frame has a high vertical height. , the front end of the other vehicle, which is lower than the own vehicle, does not hit the front end of the own vehicle and can be suppressed from passing each other. In other words, it is possible to suppress the passing each other. In this case, the other vehicle hits the front end of the own vehicle's frame, and the frame is bent to absorb the collision energy. However, in an SOT collision outside the frame, the frame cannot be folded and the collision energy cannot be absorbed.

In the structure disclosed in Patent Document 2, the front side frame is provided at a plurality of spaced positions in the longitudinal direction of the vehicle where it is likely to bend. Therefore, the frame can be folded at the time of SOT collision. However, since the vertical height of the front end of the frame is low, it is not possible to prevent the vehicle from passing another vehicle with a different vertical height from the other vehicle, and the frame cannot be folded.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and is capable of suppressing passing between the front end of the front side frame of the own vehicle and an opponent vehicle having a height different from that of the other vehicle, and suppressing the SOT collision outside the front end portion of the front side frame of the own vehicle. It is an object of the present invention to provide a vehicle body front structure capable of absorbing collision energy caused by

To achieve the above object, the present invention provides a vehicle front structure having front side frames extending in the longitudinal direction of the vehicle body, wherein the front side frames are provided with flanges extending vertically rearward in the longitudinal direction of the vehicle body. A U-shaped cross-sectional shape comprising a hat cross-sectional portion having a hat cross-sectional shape and a projecting portion having concave-shaped ends extending outward in the vehicle width direction on the front side of the hat cross-sectional portion A second U-shape formed by superimposing a separate rectangular plate-shaped upper and lower cross-sectional enlarged portion on the cross-sectional portion and the outer wall of the U-shaped cross-sectional portion so that the vertical cross-sectional shape of the U-shaped cross-sectional portion is enlarged. and a back plate closing an opening formed by the U-shaped cross-section and the second U-shaped cross-section.

To obtain a vehicle body front part structure capable of suppressing passing by another vehicle whose height is different from that of the front end of a front side frame of one's own vehicle, and capable of absorbing the collision energy caused by the SOT collision outside the front end of the front side frame. can be done.

1 is a side view of the vehicle body front structure of an automobile according to the present embodiment; FIG. FIG. 2 is a perspective view showing a structure viewed from the oblique front side of the vehicle body indicated by an arrow II shown in FIG. 1 toward the front side of the vehicle body; 3 is a perspective view showing the structure when the connecting plate 16 shown in FIG. 2 is removed; FIG. FIG. 2 is a sectional view along IV-IV in FIG. 1; FIG. 2 is a cross-sectional view of the VV cross section of FIG. 1 viewed from above; FIG. 4 is a plan view showing three folding points of the front side frame; Fig. 3 is a plan view of the front side frame and upper member on the left side of the vehicle body; FIG. 4 is a perspective view showing the configuration of the upper member as viewed from the rear side (lower side); FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 8; FIG. 10 is a perspective view showing the configuration of the rear surface of the front side frame, the joining member of the upper member, and the like, viewed obliquely from the lower side indicated by the arrow X in FIG. 9 ; 11 is a cross-sectional view taken along line XI-XI of FIG. 10; FIG. FIG. 10 is a perspective view of the front end of the upper member, the cross-sectional view of the projection including the back plate of the front side frame, and the connecting plate, as seen from the rear side of the vehicle body; FIG. 5 is a perspective view showing a configuration in which the front end portion of the upper member and the protruding portion of the front side frame are sandwiched between upper and lower joint members and a second joint member; FIG. 4 is a perspective view showing a bulkhead extending rearward along the outer wall while being spaced from the outer wall within the front side frame;

<Configuration of Embodiment>
Embodiments of the present invention will be described in detail with reference to FIGS. 1-14. In the description, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted. In each figure, the arrows "front and back" indicate the front-rear direction of the automobile (not shown), "left and right" indicate the width direction of the automobile, and "up and down" indicate the vertical up-down direction.

FIG. 1 is a side view of the vehicle body front structure of an automobile according to the present embodiment. FIG. 2 is a perspective view showing the structure viewed from the oblique front side of the vehicle body indicated by arrow II shown in FIG. 1 toward the front side of the vehicle body. FIG. 3 is a perspective view showing the structure when the connecting plate 16 shown in FIG. 2 is removed. FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a cross-sectional view of the VV cross section of FIG. 1 viewed from above.

The vehicle body front structure 10 shown in FIG. 1 includes front side frames 11 (frames 11) extending linearly on both sides of the vehicle body, and the frames 11 on both sides extending outward in the vehicle width direction (also referred to as outside). and an upper member 12. The upper member 12 is curved in an arch shape from above the tire (not shown) to the front portion of the vehicle body, and as shown in FIG. there is

The frame 11 shown in FIG. 1 is provided with a hat cross-sectional portion 11c having vertically extending flanges 11a and 11b on the rear side of the front end of the frame 11 and having a general hat cross-sectional shape (see FIG. 4). Furthermore, as shown in FIG. 3, the frame 11 has, on the front side of the hat cross-section portion 11c, a first U-cross section having a substantially U-shaped cross-section, which has a protruding portion 11d having both ends of a concave shape expanding toward the outside. A portion 11e is provided. The first U-shaped section 11e does not have flanges 11a and 11b unlike the hat section 11c.

In addition, the frame 11 has a separate rectangular plate-shaped upper and lower cross-section enlarging portion 13 on the lower side of the outer wall of the first U-shaped cross-sectional portion 11e so that the cross-sectional shape of the first U-shaped cross-sectional portion 11e in the up-down direction is enlarged. and a second U-shaped cross-sectional portion 14 formed by overlapping the .

Further, the frame 11 includes a back plate 15 that closes the opening formed by the first U-shaped section 11e and the second U-shaped section 14, and the back plate 15 closes the opening so that the hollow frame extends in the longitudinal direction of the vehicle body. It has a shape. Further, the front end of the second U-shaped section 14 of the frame 11 and the front end of the upper member 12 are connected by a connection plate 16, as shown in FIG.

As shown in FIG. 1, the enlarged vertical cross-sectional portion 13 has a trumpet shape that gradually opens in the vertical direction from the rear side of the vehicle body of the frame 11 toward the front end thereof. Due to the trumpet shape, at the time of a passing collision with the other vehicle, this load input (arrow Y1) is smoothly transmitted through the trumpet shape and transmitted to the hat section 11c on the rear side of the frame 11 .

As shown in FIG. 5, the enlarged vertical cross-sectional portion 13 has a trumpet shape that gradually opens outward from the rear side of the vehicle body of the frame 11 toward the front end thereof. Due to this trumpet shape, when an opponent vehicle collides with the upper member 12 in an SOT, the load input in the oblique direction due to the SOT collision is smoothly transmitted through the trumpet shape, and the bending points 11g, 11h, and 11i (Fig. 6) on the rear side of the frame 11 ) intensively.

As shown in the top plan view of the frame 11 in FIG. 6, the hat section 11c of the frame 11 has at least three bending points 11g, 11h, and 11i in the longitudinal direction of the vehicle body. Each of the bending points 11g, 11h, and 11i is a V-shaped valley portion, and the frame 11 is bent in a zigzag shape as indicated by the dashed line 11Z when the vehicle collides with the other vehicle in the direction indicated by the arrow Y2. . More specifically, at the time of the collision, the bending point 11g of the hat cross section 11c bends to the outside of the vehicle in the vehicle width direction indicated by the arrow Yg, and the bending point 11h bends to the inside of the vehicle in the vehicle width direction as indicated by the arrow Yh. , zigzag like the frame 11Z.

FIG. 7 is a top plan view of the frame 11 and the upper member 12 on the left side of the vehicle body. The upper member 12 outside the frame 11 in the vehicle width direction has a front end portion 12a that curves downward from the rear side of the vehicle body in an arch shape and is bent inward in the vehicle width direction indicated by an arrow Y3.

On the front end side of the frame 11, a side surface 11d1 of the projecting portion 11d formed by a vertical back plate 15 (FIG. 3) that closes the opening of the projecting portion 11d projecting outward in a trumpet shape, and a side surface 12a1 of the front end portion 12a of the upper member 12. A V-shaped space is formed at . A joint member 17 is installed under the projecting portion 11d and the front end portion 12a so as to block the V-shaped space from below.

The joint member 17 is installed on the upper member 12 and the back plate 15 (side surface 11d1 of the protruding portion 11d) as shown in FIG. It is fixed with a nut.

As shown in FIG. 9, which is a cross-sectional view taken along line IX-IX of FIG. 8, the joint member 17 is provided on the lower surface side of the front end portion of the upper member 12, and the front end portion of the joint member 17 is bent forward to form a forward bending flange 17a. Prepare.

The front side of the forward bending flange 17a, which is the front side of the vehicle body, abuts on the connecting plate 16, and a nut 18 constituting a bumper beam fastening portion is fixed to the back side (rear side) of the forward bending flange 17a. A through hole is formed in the connecting plate 16 at a position overlapping the screw hole of the nut 18 , and a bolt for fixing a bumper beam (not shown) is inserted through the through hole and screwed into the nut 18 .

FIG. 10 shows a configuration in which the rear surfaces of the joint member 17, the upper member 12, and the like are obliquely viewed from below as indicated by an arrow X. As shown in FIG.

As shown in FIG. 10, the upper member 12 has a shape in which an inner member 12c having an L-shaped cross section facing inward in the vehicle width direction and an outer member 12d having an L-shaped cross section facing outward are combined in a square hollow shape. . The joint member 17 is a V-shaped panel and is joined to the inner member 12c of the front end portion 12a of the upper member 12, as indicated by the dashed line L5 in a side view from the right side. Further, the joining member 17 has a side bent flange 17b bent to the side of the vehicle body.

As shown in FIG. 11, which is a cross-sectional view taken along the line XI-XI of FIG. 10, the joining member 17 forms the lower surface (lower wall) of the inner member 12c as at least one wall surface of the upper member 12. As shown in FIG. More specifically, the front end portion 12a of the upper member 12 has a horizontal portion extending horizontally at its tip, and the lower surface (lower wall) of the horizontal portion is constituted by a joint member 17. As shown in FIG. That is, the joint member 17 is bridged between the outer member 12d and the inner member 12c of the upper member 12 shown in FIG. 10 (FIG. 11) to form one wall surface as the inner member 12c.

FIG. 12 is a perspective view of the front end portion 12a of the upper member 12, the vehicle width direction cut surface of the projecting portion 11d including the back plate 15 of the frame 11, and the connecting plate 16 as viewed from the rear side of the vehicle body.

As shown in FIG. 12, the joint member 17 includes a first joint member 17d that joins the lower side of the back plate 15, which is the projecting portion 11d of the frame 11, and the lower side of the front end portion 12a of the upper member 12. As shown in FIG. Further, the joint member 17 includes a second joint member 17e that joins the upper side of the projecting portion 11d of the frame 11 and the upper side of the front end portion 12a of the upper member 12. As shown in FIG.

As shown in FIG. 3, the second joining member 17e joins the upper wall 11j of the projecting portion 11d of the frame 11, the outer wall 11k of the projecting portion 11d formed by the back plate 15, and the inner wall 12c of the upper member 12. there is As shown in FIG. 12, the second joint member 17e constitutes an outer portion of the upper wall 11j by being joined to the upper wall 11j of the projecting portion 11d. A back plate 15 is joined to this outer portion.

Further, as shown in FIG. 3, the frame 11 includes a bulkhead 19 that vertically stands and extends along the longitudinal direction of the vehicle so as to divide the interior into left and right sides in the vehicle width direction. The second joint member 17 e has a structure in which the upper end side of the bulkhead 19 is also coupled.

As shown in FIG. 3, the frame 11 has the outer wall 11k described above and an inner wall 11m facing inward in the width direction of the vehicle. The bulkhead 19 extends rearward along the outer wall 11k while being separated from the outer wall 11k within the frame 11, and as shown in FIG. It is The rear end portion 19b is joined so that this end is located at the break point 11n of the frame 11 indicated by the dashed line.

Further, as shown in FIG. 14, the protruding portion 11d of the frame 11 increases in vertical height from the rear side to the front side as indicated by double-headed arrows H1 and H2.

As shown in FIG. 3, the lower end 19a of the bulkhead 19 is joined to the lower end of the outer wall 11k of the frame 11. As shown in FIG. As a result of this connection, the projecting portion 11d of the frame 11 on the front side of the vehicle body has a large cross-sectional shape extending vertically.

<Effects of Embodiment>
Next, the characteristic configuration and effects of the vehicle body front structure of the present embodiment described above will be described. The vehicle body front structure 10 has a front side frame 11 extending in the vehicle front-rear direction on the inside in the vehicle width direction.

(1) In the vehicle body front structure 10, the frame 11 includes a hat cross-sectional portion 11c having a hat cross-sectional shape having flanges 11a and 11b extending vertically on the rear side in the vehicle longitudinal direction, and a hat cross-sectional portion 11c in front of the hat cross-sectional portion 11c. A first U-shaped cross-sectional portion 11e having a U-shaped cross-sectional shape having a protruding portion 11d that expands outward in the vehicle width direction is provided on the side. Furthermore, the frame 11 has a separate rectangular plate-like upper and lower cross-section enlarging portion 13 superimposed on the outer wall of the first U-shaped cross-sectional portion 11e so that the cross-sectional shape of the first U-shaped cross-sectional portion 11e in the vertical direction is enlarged. and a back plate 15 that closes the opening formed by the first U-shaped cross-sectional portion 11e and the second U-shaped cross-sectional portion 14 .

According to this configuration, since the upper and lower cross-sectional enlarged portions 13, which are the constituent elements of the second U-shaped cross-sectional portion 14 of the frame 11, are separate members, it is necessary to increase the size and complexity of the press die for the frame 11, which increases the cost. is gone. In addition, since the second U-shaped cross section 14 on the front end side of the frame 11 is enlarged vertically to be high, it is possible to suppress passing between the own vehicle and the other vehicle having different vertical heights. As a result, the front end of the frame 11 of the own vehicle hits the other vehicle, and the frame 11 is bent to absorb the collision energy.

Further, the frame 11 has a hollow frame shape extending in the longitudinal direction of the vehicle body by closing the openings of the first U-shaped section 11 e and the second U-shaped section 14 with the back plate 15 . With this hollow frame shape, when the frame 11 collides with the front end (arrow Y1 in FIG. 3), the collision energy is efficiently transmitted to the second U-shaped section 14 and the hat section 11c in that order. Therefore, by connecting the back plate 15 and the upper member 12, the frame 11 can be bent to absorb the collision energy when the SOT collision occurs in the upper member 12.例文帳に追加

(2) The enlarged vertical section portion 13 has a trumpet shape that gradually opens in the vertical direction from the rear side of the vehicle body of the frame 11 toward the front end thereof.

According to this configuration, the load input is efficiently transmitted through the trumpet shape of the enlarged upper and lower cross-section portions 13 at the time of a passing collision with the other vehicle. Therefore, the input load at the time of collision can be efficiently transmitted to the hat section portion 11c on the rear side of the frame 11, so that the frame 11 can be bent to absorb the collision energy.

(3) The enlarged vertical cross-section portion 13 has a trumpet shape that gradually opens outward from the vehicle width toward the front end of the frame 11 from the rear side of the vehicle body.

According to this configuration, due to the trumpet shape, when an opponent vehicle collides with the upper member 12 in an SOT collision, the load input in the oblique direction due to the SOT collision is smoothly transmitted through the trumpet shape and directed toward the bending point on the rear side of the frame 11. can be transmitted efficiently. Therefore, the frame 11 can be bent to absorb the collision energy.

(4) The hat section portion 11c of the frame 11 has a plurality of bending points 11g, 11h, and 11i that serve as starting points for bending the frame 11 in the vehicle width direction in the event of a frontal collision. At least three are provided at intervals from each other.

According to this configuration, when the own vehicle collides with the other vehicle, the bending points 11g, 11h, and 11i of the hat cross section 11c are bent, so that the frame 11 is bent in a zigzag shape as indicated by the frame 11Z. Collision energy can be absorbed by this bending.

(5) The upper member 12 is arranged outside the vehicle width of the frame 11 and further has an upper member 12 that curves in the longitudinal direction of the vehicle body. A V-shaped space is formed by the side surface of the bent front end portion 12a that is bent inward and the side surface of the protruding portion 11d that protrudes outward in a trumpet shape on the front end side of the frame 11, and is substantially V-shaped in plan view. formed. The V-shaped space is provided with a joint member 17 that is installed between the front end portion 12a and the protruding portion 11d.

According to this configuration, the side surface 12a1 of the front end portion 12a of the upper member 12 and the side surface 11d1 of the projecting portion 11d of the frame 11 form a V-shape that widens from the front side of the vehicle body toward the rear side. can be distributed between the frame 11 and the upper member 12 as indicated by arrows Y4 and Y5 in FIG. Therefore, it is possible to reduce the thickness of the frame 11 and the upper member 12 to reduce the weight.

Further, since the joint member 17 is bridged between the side surface 12a1 of the upper member 12 and the side surface 11d1 of the frame 11 and joined together, they can be joined firmly. Therefore, the length L3 of the joining member 17 in the longitudinal direction of the vehicle body can be made shorter than the length L4 from the rear end of the joining member 17 in the longitudinal direction of the vehicle body to the front end of the vehicle body, so that the length in the longitudinal direction of the vehicle body can be shortened.

(6) The joint member 17 is a V-shaped panel when viewed from the side, and is joined to the lower surface of the front end portion 12a of the upper member 12 at the outer side of the vehicle width, and is bent vertically to the inner side of the vehicle width. A flange 17b is provided, and the side bending flange 17b is coupled to the outer surface of the projecting portion 11d of the frame 11. As shown in FIG.

According to this configuration, the load input from the bumper beam fastening portion using the nut 18 shown in FIG. and the outer surface of the projecting portion 11d (back plate 15) of the frame 11 via the side bending flange 17b. Therefore, the large load of the SOT collision can be applied to the outer surface of the projecting portion 11d of the frame 11, so that the frame 11 can be bent to absorb the collision energy.

(7) The joint member 17 includes a first joint member 17d that joins the lower side of the projecting portion 11d (back plate 15) of the frame 11 and the lower side of the front end portion 12a of the upper member 12, and the projecting portion 11d of the frame 11. and the upper side of the front end portion 12 a of the upper member 12 .

According to this configuration, the front end portion 12a of the upper member 12 and the projecting portion 11d of the frame 11 are sandwiched and joined together by both the first joint member 17d and the second joint member 17e. Therefore, since the coupling strength between the two is increased, even in a structure in which the upper member 12 is inclined upward as indicated by the inclined line L8 with respect to the horizontal frame 11 indicated by the horizontal line L7 in side view in FIG. can be easily dispersed in a V-shape as indicated by a horizontal line L7 and an inclined line L8.

(8) The second joint member 17e is configured by joining the upper wall 11j of the projecting portion 11d of the frame 11, the outer wall 11k of the projecting portion 11d formed by the back plate 15, and the inner wall 12c of the upper member 12. .

According to this configuration, the second joint member 17e bears part of the upper wall 11j of the projecting portion 11d of the frame 11, so that the weight of the frame 11 can be reduced.

(9) The second joint member 17e is configured to be joined to the upper end side of the bulkhead 19 extending in the longitudinal direction of the vehicle body so as to divide the inside of the frame 11 into left and right sides in the vehicle width direction.

According to this configuration, the strength and rigidity of the front end of the frame 11 and the projecting portion 11d are improved by the bulkhead 19, so that the load is transmitted to the rear bending points 11g, 11h, and 11i while suppressing deformation due to the SOT collision load. can.

(10) The bulkhead 19 extends rearward along the outer wall 11k of the frame 11 while being separated from the outer wall 11k of the frame 11, and the extended rear end portion 19b extends toward the inner wall of the frame 11. 11m.

According to this configuration, the SOT collision load (arrow Y1 shown in FIG. 1) input to the projecting portion 11d of the frame 11 is transferred to the inner and outer walls 11m and 11k at the rear bending point 11n by the bulkhead 19 and the outer wall 11k. Load can be transmitted. Therefore, the frame 11 can be easily bent in an inward convex shape or the like to absorb the impact energy.

(11)
A lower end portion 19a of the bulkhead 19 is connected to a lower end portion of the outer wall 11k of the frame 11 .

According to this configuration, the protruding portion 11d of the frame 11 has a large cross-sectional shape extending vertically, so that the input amount of the SOT collision (arrow Y1) can be increased.

Although the vehicle body structure according to the present embodiment has been described above, the present invention is not limited to this, and can be modified as appropriate without departing from the gist of the present invention.

10 Body Front Structure 11 Front Side Frame 11Z Zigzag Front Side Frame 11a, 11b Flange 11c Hat Section 11d Projection 11d1 Side 11e U-shaped Section 11g, 11h, 11i, 11n Bending Point 11j Upper Wall 11k Outer Wall 11m Inner wall 12 Upper member 12a Front end 12a1 Side 12c Inner wall 13 Enlarged vertical section 14 Second U-shaped section 15 Back plate 17 Joint member 17a Forward bending flange 17b Side bending flange 17d First joint member 17e Second joint member 19 Bulk Head 19a Lower end 19b Rear end

Claims (11)

In a vehicle body front structure having a front side frame extending in the longitudinal direction of the vehicle body,
The front side frame is
a hat cross-sectional portion having a vertically extending flange on the rear side in the longitudinal direction of the vehicle body and exhibiting a hat cross-sectional shape;
a first U-shaped cross-sectional portion having a U-shaped cross-sectional shape having a projecting portion extending outward in the vehicle width direction on the front side of the hat cross-sectional portion;
A second U-shaped cross section formed by superimposing a separate rectangular plate-shaped upper and lower cross-section enlarged portion on the outer wall of the first U-shaped cross section so that the vertical cross-sectional shape of the first U-shaped cross section is enlarged. When,
A vehicle body front structure, comprising: a back plate that closes an opening formed by the first U-shaped cross-sectional portion and the second U-shaped cross-sectional portion. 2. The vehicle body front structure according to claim 1, wherein the enlarged vertical cross-sectional portion has a trumpet shape that gradually opens vertically from the rear side of the vehicle body toward the front end of the front side frame. 2. The vehicle body front structure according to claim 1, wherein the enlarged vertical cross-sectional portion has a trumpet shape that gradually opens outward from the vehicle width toward the front end of the front side frame from the rear side of the vehicle body. The hat cross section has a plurality of bending points that serve as starting points for bending the front side frame in the vehicle width direction in the event of a frontal collision,
2. The vehicle body front structure according to claim 1, wherein at least three bending points are provided at intervals in the longitudinal direction. further comprising an upper member arranged outside the vehicle width of the front side frame and curved in an arch shape in the longitudinal direction of the vehicle body;
a front end portion of the upper member that slopes down toward the front side is bent toward the vehicle width inward direction to the vicinity of the front side frame;
A V-shaped space is formed by the side surface of the bent front end portion and the side surface of the projecting portion projecting outward in a trumpet shape on the front end side of the front side frame, and
2. The vehicle body front structure according to claim 1, wherein the V-shaped space is provided with a joint member installed between the front end portion and the projecting portion. The joining member is a V-shaped panel when viewed from the side, and has a side bending flange that is attached to the lower surface of the front end portion of the upper member on the outside of the vehicle width and bent vertically on the inside of the vehicle width, 6. The vehicle body front structure according to claim 5, wherein a side bending flange is coupled to the outer surface of the protrusion of the front side frame. The joint members include a first joint member that joins the lower side of the protrusion of the front side frame and the lower side of the front end of the upper member, the upper side of the protrusion of the front side frame, and the upper member. The vehicle body front structure according to claim 5, further comprising a second joint member that joins the upper side of the front end portion. The second joint member is formed by joining an upper wall of the protrusion of the front side frame, an outer wall of the protrusion formed by the back plate, and an inner wall of the upper member in the vehicle width inward direction. The vehicle body front structure according to claim 7. 8. The second joining member joins the upper end side of a bulkhead extending in the longitudinal direction of the vehicle body so as to divide the inside of the front side frame into left and right sides in the vehicle width direction. body front structure. The bulkhead extends rearward along the outer wall of the front side frame while being spaced apart from the outer wall of the front side frame, and the extended rear end portion is the inner wall of the front side frame. 10. The vehicle body front structure according to claim 9, characterized in that it is coupled to the . 11. The vehicle body front structure according to claim 10, wherein the lower end of the bulkhead is joined to the lower end of the outer wall of the front side frame.

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