Front body structure

Abstract

The present invention can suppress a collision with an oncoming vehicle whose height is different from the front end of the front side frame of the vehicle, and absorb the collision energy generated by the SOT collision on the outside of the front end of the front side frame. In the front part structure of the vehicle body (10), the frame (11) has: a hat cross-section part (11c) having flanges (11a, 11b) extending upward and downward on the rear side of the vehicle body in the front-back direction and forming a hat cross-section shape; a first U-shaped cross-section part (11e) having a U-shaped cross-section shape, which is formed by having a protrusion (11d) extending toward the outside in the vehicle width direction on the front side of the hat cross-section part. The frame also has: a second U-shaped cross-section part (14) formed by overlapping a rectangular plate-shaped upper and lower cross-section enlarged part (13) formed separately on the outer wall of the first U-shaped cross-section part in a manner that expands the cross-sectional shape of the first U-shaped cross-section part in the upper and lower directions; and a back plate (15) that closes the opening formed by the first U-shaped cross-section part (11e) and the second U-shaped cross-section part (14).

Description

Technical Field

[0001] The present invention relates to a vehicle body front structure for absorbing collision energy generated by a SOT (Small Overlap) collision at the outer sides of front end portions of front side frames on both sides of a vehicle body. Background Art

[0002] The SOT collision is a collision with a small overlap amount such as a collision between a corner and an oncoming vehicle. As a vehicle body front structure that absorbs the collision energy generated by the SOT collision, there is, for example, a structure described in Patent Document 1. In this structure, the front part of the upper member arranged on both sides of the front of the vehicle body is overlapped and connected to the lower surface of the front end of the front side frame arranged on the inner side in the vehicle width direction relative to the upper member.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 4875508

[0006] Patent Document 2: Japanese Patent No. 6546065 Summary of the invention

[0007] In the vehicle of the structure of Patent Document 1, the front part of the upper member is overlapped and connected with the lower surface of the front end of the front side frame (also referred to as the frame) up and down, so that the vertical height of the front end of the frame becomes larger, and the front end of the oncoming vehicle lower than the vehicle will not collide with the front end of the vehicle, which can suppress the passing of vehicles. In other words, the collision of passing vehicles can be suppressed. In this case, the oncoming vehicle collides with the front end of the frame of the vehicle, so the frame bends and can absorb the collision energy. However, the SOT collision at the outer side of the frame cannot bend the frame and cannot absorb the collision energy.

[0008] In the structure described in Patent Document 2, the front side frame is provided with easily bendable parts at a plurality of separated positions in the vehicle front-rear direction. Therefore, the frame can be bent when the SOT collides. However, the vertical height of the front end of the frame is small, so it is not possible to suppress a collision with an oncoming vehicle whose vertical height is different from that of the vehicle, and the frame cannot be bent.

[0009] The present invention is made in view of such a situation, and its purpose is to provide a vehicle body front structure which can suppress a cross-traffic collision with an oncoming vehicle whose front end of a front side frame has a height different from that of the vehicle, and absorb the collision energy generated by a SOT collision on the outer side of the front end of the front side frame.

[0010] In order to achieve the above-mentioned purpose, the front structure of the vehicle body of the present invention has a front side frame extending along the front-to-back direction of the vehicle body, and the front structure of the vehicle body is characterized in that the front side frame has: a hat cross-section portion, which has a flange extending upward and downward on the rear side in the front-to-back direction of the vehicle body and is in the shape of a hat cross-section; a first U-shaped cross-section portion in a U-shaped cross-section, which is formed by having a protrusion extending toward the outside in the vehicle width direction on the front side of the hat cross-section portion; a second U-shaped cross-section portion, which is formed by overlapping upper and lower cross-section enlarged portions of a rectangular plate constituted separately on the outer wall of the first U-shaped cross-section portion in a manner that enlarges the cross-sectional shape of the first U-shaped cross-section portion in the upper and lower directions; and a back plate, which closes the opening formed by the first U-shaped cross-section portion and the second U-shaped cross-section portion.

[0011] Effects of the Invention

[0012] According to the present invention, a vehicle front structure can be obtained that can suppress a cross-traffic collision with an oncoming vehicle having a front end of a front side frame different in height from that of the vehicle and absorb collision energy due to a SOT collision outside the front end of the front side frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a side view of the vehicle body front structure of the automobile according to the present embodiment.

[0014] Figure 2 It means by Figure 1 The arrow II indicated in the figure is a perspective view of the structure of the front side of the vehicle body as viewed from the oblique front side of the vehicle body.

[0015] Figure 3 It means that Figure 2 The illustrated perspective view is of a configuration in which the connecting plate 16 is removed.

[0016] Figure 4 yes Figure 1 IV-IV cross-sectional view.

[0017] Figure 5 Observe from above Figure 1 Cross-sectional view of section VV.

[0018] Figure 6 It is a top view showing the three bending points of the front side frame.

[0019] Figure 7 It is a top view of the front side frame and upper member on the left side of the vehicle body.

[0020] Figure 8 It is a perspective view showing the structure of the upper member as viewed from the back side (lower surface side).

[0021] Fig. 9 yes Figure 8IX-IX sectional view.

[0022] Fig.10 Yes means Fig. 9 1 is a perspective view of the structure of the back side of the front side frame and the joint parts of the upper member, etc., as seen obliquely upward from the lower side as indicated by the arrow X in the figure.

[0023] Fig.11 yes Fig.10 XI-XI sectional view.

[0024] Fig.12 This is a perspective view of a cross section in the vehicle width direction including the front end portion of the upper member and the protruding portion of the back plate of the front side frame and the connecting plate as viewed from the rear side of the vehicle body.

[0025] Fig.13 It is a perspective view showing a structure in which the front end portion of the upper member and the protruding portion of the front side frame are joined by being sandwiched between the first joint member and the second joint member in the upper and lower directions.

[0026] Fig.14 It is a perspective view showing a bulkhead extending toward the rear side along the outer wall while being separated from the outer wall in the front side frame.

[0027] Description of Reference Numerals

[0028] 10 Front structure

[0029] 11 Front side frame

[0030] 11Z sawtooth front frame

[0031] 11a, 11b Flange

[0032] 11c Hat section

[0033] 11d Protrusion

[0034] 11d1 Side

[0035] 11e U-shaped cross section

[0036] 11g, 11h, 11i, 11n bending points

[0037] 11j Upper wall

[0038] 11k Outer wall

[0039] 11m Inner wall

[0040] 12 Upper component

[0041] 12a Front end

[0042] 12a1 Side

[0043] 12c Inner wall

[0044] 13 Upper and lower cross-section expansion

[0045] 14 Second U-shaped cross section

[0046] 15 Back Panel

[0047] 17 Joint parts

[0048] 17a Front curved flange

[0049] 17b Side curved flange

[0050] 17d First joining member

[0051] 17e Second joining member

[0052] 19 Bulkhead

[0053] 19a Lower end

[0054] 19b Rear end DETAILED DESCRIPTION

[0055] <Structure of Embodiment>

[0056] Reference Figures 1 to 14 The embodiments of the present invention will be described in detail. In the description, the same reference numerals are used for the same elements, and repeated descriptions are omitted. In addition, in each figure, "front and back" indicated by arrows represents the front and back directions of a car (not shown), "left and right" represents the width direction of the car, and "up and down" represents the vertical up and down direction.

[0057] Figure 1 It is a side view of the vehicle body front structure of the automobile according to the present embodiment. Figure 2 It means by Figure 1 The arrow II indicated in the figure is a perspective view of the structure of the front side of the vehicle body as viewed from the oblique front side of the vehicle body. Figure 3 It means that Figure 2 The illustrated perspective view is of a configuration in which the connecting plate 16 is removed. Figure 4 yes Figure 1 IV-IV cross-sectional view. Figure 5 Observe from above Figure 1 Cross-sectional view of section VV.

[0058] Figure 1 The vehicle front structure 10 shown in the figure has: a front side frame 11 (frame 11) extending linearly on both sides of the vehicle body; and an upper member 12 extending on the vehicle width direction outer side (also referred to as the outer side) of the frame 11 on both sides. The upper member 12 is curved in an arch shape from the upper side of the tire (not shown) to the front part of the vehicle body, as shown in FIG. Figure 3As shown, the front end side of the upper member 12 in the vehicle body is disposed adjacent to the front end side of the vehicle frame 11 .

[0059] Figure 1 The frame 11 shown in the figure has a hat cross-section portion 11c, which has flanges 11a and 11b extending vertically on the rear side compared to the front end of the frame 11 and has a substantially hat cross-section shape (see Figure 4 ). Moreover, the frame 11 has a first U-shaped cross-sectional portion 11e having a substantially U-shaped cross-sectional shape. Figure 3 As shown, the first U-shaped cross section 11e is formed by having a concave protrusion 11d with both ends extending outward on the front side of the hat cross section 11c. The first U-shaped cross section 11e does not have flanges 11a and 11b like the hat cross section 11c.

[0060] In addition, the frame 11 has a second U-shaped cross-sectional portion 14, which is formed by overlapping a separately constructed rectangular plate-shaped upper and lower cross-sectional enlarged portion 13 on the lower side of the outer wall of the first U-shaped cross-sectional portion 11e in a manner that enlarges the cross-sectional shape of the first U-shaped cross-sectional portion 11e in the upper and lower directions.

[0061] The frame 11 has a back plate 15 that closes the opening formed by the first U-shaped cross-section 11e and the second U-shaped cross-section 14. The back plate 15 closes the opening to form a hollow frame extending in the front-rear direction of the vehicle body. Figure 2 As shown, the front end of the second U-shaped cross-section portion 14 of the frame 11 and the front end of the upper member 12 are connected by a connecting plate 16 .

[0062] like Figure 1 As shown, the upper and lower cross-sectional enlarged portion 13 is formed into a trumpet shape that gradually expands in the upper and lower directions from the rear side of the vehicle body toward the front end of the vehicle frame 11. When there is a collision with an oncoming vehicle, the load input (arrow Y1) is smoothly transmitted along the trumpet shape to the hat cross-sectional portion 11c on the rear side of the vehicle frame 11.

[0063] like Figure 5 As shown, the upper and lower cross-sectional enlarged portions 13 form a trumpet shape that gradually expands outward from the rear side of the vehicle body to the front end of the frame 11. Due to the trumpet shape, when a SOT collision with an oncoming vehicle occurs on the upper member 12, the oblique load input due to the SOT collision is smoothly transmitted along the trumpet shape toward the bending points 11g, 11h, 11i ( Figure 6 ) centralized transmission.

[0064] As observed from above Figure 6As shown in the top view of the frame 11, the hat cross-section portion 11c of the frame 11 has at least three bending points 11g, 11h, and 11i in the front-rear direction of the vehicle body. Each bending point 11g, 11h, and 11i is a concave portion in the shape of a letter "く". When the vehicle body 11 collides with an oncoming vehicle in the direction indicated by the arrow Y2, the frame 11 is bent in a zigzag shape as indicated by the dotted line 11Z. To further explain, when the collision occurs, the bending point 11g of the hat cross-section portion 11c is bent at the outer side of the vehicle body in the vehicle width direction indicated by the arrow Yg, and the bending point 11h is bent at the inner side of the vehicle body in the vehicle width direction indicated by the arrow Yh, thereby bending in a zigzag shape like the frame 11Z.

[0065] Figure 7 The upper member 12 on the vehicle width outer side relative to the frame 11 is bent in the vehicle width inner direction indicated by arrow Y3 at the front end portion 12a which is inclined downward in an arched shape from the vehicle rear side.

[0066] A V-shaped space is formed at the front end of the frame 11 by the side surface 11d1 of the protruding portion 11d and the side surface 12a1 of the front end portion 12a of the upper member 12. The side surface 11d1 is formed by a vertical back plate 15 ( Figure 3 The joint member 17 is bridged between the protruding portion 11d and the lower side of the front end portion 12a in a state of closing the V-shaped space from the lower side.

[0067] like Figure 8 The joint member 17 is provided on the upper member 12 and the back plate 15 (the side surface 11d1 of the protruding portion 11d) so as to be configured when the upper member 12 is viewed from the back side (lower surface side), and is fixed to the connecting plate 16 by bolts and nuts.

[0068] As Figure 8 IX-IX cross-sectional view Fig. 9 As shown, the joint member 17 has a front bent flange 17 a provided on the lower surface side of the front end portion of the upper member 12 and configured to bend the front end portion of the joint member 17 toward the front side.

[0069] The front side of the front curved flange 17a, which is the front side of the vehicle body, abuts against the connecting plate 16, and a nut 18 constituting a bumper beam fastening portion is fixed to the back side (back side) of the front curved flange 17a. A through hole is formed at a position of the connecting plate 16 that overlaps with the threaded hole of the nut 18, and a bolt that fixes the bumper beam (not shown) is inserted through the through hole and screwed and fixed to the nut 18.

[0070] Fig.10The structure of the back surface of the joint member 17, the upper member 12, etc., as shown by the arrow X and viewed obliquely upward from the lower side, is shown.

[0071] like Fig.10 As shown in FIG. 1 , the upper member 12 is formed by combining an inner member 12c with an L-shaped cross section facing the inner side in the vehicle width direction and an outer member 12d with an L-shaped cross section facing the outer side into a hollow shape with a quadrangular cross section. The joint member 17 is a V-shaped panel as shown by a dotted line L5 when viewed from the right side, and is joined to the inner member 12c of the front end portion 12a of the upper member 12. The joint member 17 has a side curved flange 17b bent toward the side of the vehicle body, and the side curved flange 17b is joined to the outer surface of the back plate 15 constituting the protruding portion 11d of the vehicle frame 11.

[0072] As Fig.10 XI-XI cross-sectional view Fig.11 As shown in FIG. 1 , the joint component 17 forms the lower surface (lower wall) of the inner component 12c, which is at least one wall surface of the upper component 12. To further explain, the front end portion 12a of the upper component 12 has a horizontal portion extending horizontally at the front end, and the lower surface (lower wall) of the horizontal portion is formed by the joint component 17. That is, the joint component 17 is mounted on Fig.10 The outer part 12d and the inner part 12c ( Fig.11 ), forming a wall surface serving as the inner part 12c.

[0073] Fig.12 This is a perspective view of a cross section in the vehicle width direction including the front end portion 12 a of the upper member 12 , the protruding portion 11 d of the back plate 15 of the vehicle frame 11 , and the connecting plate 16 as viewed from the rear side of the vehicle body.

[0074] like Fig.12 As shown, the joint member 17 has a first joint member 17d for joining the lower side of the back plate 15, which is the protruding portion 11d of the frame 11, and the lower side of the front end portion 12a of the upper member 12. Furthermore, the joint member 17 has a second joint member 17e for joining the upper side of the protruding portion 11d of the frame 11 and the upper side of the front end portion 12a of the upper member 12.

[0075] like Figure 3 As shown, the second joint member 17e joins the upper wall 11j of the protruding portion 11d of the frame 11 and the outer side wall 11k of the protruding portion 11d formed by the back plate 15, and the inner side wall 12c of the upper member 12. Fig.12 As shown, the second engagement member 17e is engaged with the upper wall 11j of the protruding portion 11d to form the outer portion of the upper wall 11j. The back plate 15 is engaged with the outer portion.

[0076] Moreover, if Figure 3 As shown, the vehicle frame 11 has a bulkhead 19 vertically erected and extending along the vehicle body front-rear direction so as to divide the interior into left and right in the vehicle width direction. The second joint member 17e is structured to be connected to the upper end side of the bulkhead 19.

[0077] like Figure 3 As shown in FIG. 1 , the vehicle frame 11 includes the outer wall 11k and the inner wall 11m facing inwardly in the vehicle width direction. The partition plate 19 extends toward the rear side along the outer wall 11k while being separated from the outer wall 11k in the vehicle frame 11. Fig.14 As shown in FIG. 1 , the extended rear end portion 19b is connected to the inner side wall 11m. The rear end portion 19b is connected in a state where the end is located at a bending point 11n of the frame 11 shown by a dotted line.

[0078] In addition, if Fig.14 As shown in FIG. 1 , the protruding portion 11 d of the vehicle frame 11 increases in vertical height from the rear side toward the front side as indicated by double-headed arrows H1 and H2 .

[0079] like Figure 3 As shown, the lower end 19a of the bulkhead 19 is connected to the lower end of the outer side wall 11k of the vehicle frame 11. Due to this connection, the protruding portion 11d of the vehicle frame 11 on the vehicle body front side has a large cross-sectional shape extending upward and downward.

[0080] <Effects of implementation>

[0081] Next, the characteristic configuration of the vehicle body front structure of the present embodiment and its effects will be described. The vehicle body front structure 10 includes a front side frame 11 extending inwardly in the vehicle body front-rear direction.

[0082] (1) In the vehicle front structure 10, the vehicle frame 11 has: a hat cross-section portion 11c having a hat cross-section shape having flanges 11a and 11b extending upward and downward on the rear side of the vehicle front-back direction; and a first U-shaped cross-section portion 11e having a U-shaped cross-section shape, which is formed by having a protrusion 11d extending toward the outside in the vehicle width direction on the front side of the hat cross-section portion 11c. In addition, the vehicle frame 11 has: a second U-shaped cross-section portion 14, which is formed by overlapping a rectangular plate-shaped upper and lower cross-section enlarged portion 13 formed separately on the outer wall of the first U-shaped cross-section portion 11e in a manner that enlarges the cross-sectional shape of the first U-shaped cross-section portion 11e in the upper and lower directions; and a back plate 15 that closes the opening formed by the first U-shaped cross-section portion 11e and the second U-shaped cross-section portion 14.

[0083] According to this configuration, the upper and lower cross-sectional enlarged portions 13, which are components of the second U-shaped cross-sectional portion 14 of the vehicle frame 11, are divided into separate parts, thereby eliminating the need to increase the size and complexity of the stamping die of the vehicle frame 11, which would otherwise result in high costs. In addition, the second U-shaped cross-sectional portion 14 on the front end side of the vehicle frame 11 is enlarged and raised upward and downward, thereby suppressing a collision with an oncoming vehicle whose upper and lower heights are different from those of the vehicle. Therefore, the oncoming vehicle collides with the front end of the vehicle frame 11, and the frame 11 bends to absorb the collision energy.

[0084] In addition, the frame 11 is formed into a hollow frame shape extending in the front-rear direction of the vehicle body by closing the openings of the first U-shaped cross-section 11e and the second U-shaped cross-section 14 by the back plate 15. With this hollow frame shape, when a collision occurs to the front end of the frame 11 ( Figure 3 The collision energy is efficiently transmitted along the second U-shaped cross-section 14 and the hat cross-section 11c as shown by the arrow Y1. Therefore, by connecting the back plate 15 and the upper member 12, the frame 11 can be bent and the collision energy can be absorbed when the upper member 12 is subjected to a SOT collision.

[0085] (2) The vertical cross-sectional enlarged portion 13 is formed into a trumpet shape that gradually expands in the vertical direction from the vehicle body rear side toward the front end of the vehicle frame 11 .

[0086] According to this configuration, when a collision with an oncoming vehicle occurs, the load input is efficiently transmitted along the trumpet shape of the upper and lower cross-sectional enlarged portions 13. Therefore, the input load during the collision can be efficiently transmitted to the hat cross-sectional portion 11c on the rear side of the vehicle frame 11, thereby bending the vehicle frame 11 to absorb the collision energy.

[0087] (3) The upper and lower cross-sectional enlarged portions 13 are configured in a trumpet shape that gradually expands toward the vehicle width outer side from the vehicle body rear side toward the front end of the vehicle frame 11 .

[0088] According to this configuration, due to the trumpet shape, when an SOT collision with an oncoming vehicle occurs on the upper member 12, the oblique load input due to the SOT collision is smoothly transmitted along the trumpet shape and can be efficiently transmitted toward the bending point on the rear side of the vehicle frame 11. Therefore, the vehicle frame 11 is bent to absorb the collision energy.

[0089] (4) The hat cross-section portion 11c of the frame 11 is constructed to have a plurality of bending points 11g, 11h, and 11i which serve as starting points for bending the frame 11 in the vehicle width direction in the event of a frontal collision, and at least three bending points 11g, 11h, and 11i are provided at intervals in the front-rear direction.

[0090] According to this configuration, when the host vehicle collides with an oncoming vehicle, the bending points 11g, 11h, and 11i of the hat cross-section portion 11c bend, whereby the vehicle frame 11 bends in a zigzag shape as indicated by the vehicle frame 11Z. The collision energy can be absorbed by this bending.

[0091] (5) The upper member 12 is provided on the outer side of the vehicle width of the frame 11 and is curved in an arch shape in the front-rear direction of the vehicle body. The front end portion 12a of the upper member 12, which is inclined downward on the front side, is bent toward the inner side of the vehicle width until it reaches the vicinity of the frame 11. A V-shaped space is formed by the side surface of the bent front end portion 12a and the side surface of the protruding portion 11d protruding outward in a trumpet shape at the front end side of the frame 11. A joint member 17 is provided in the V-shaped space and is connected to the front end portion 12a and the protruding portion 11d.

[0092] According to this structure, the side surface 12a1 of the front end portion 12a of the upper member 12 and the side surface 11d1 of the protruding portion 11d of the frame 11 are V-shaped and expand from the front side of the vehicle body toward the rear side, so that the load during the SOT collision can be made as follows: Figure 7 The outer surface of the vehicle body 11 is dispersed to the vehicle body frame 11 and the upper member 12 as shown by arrows Y4 and Y5. Therefore, the vehicle body frame 11 and the upper member 12 can be made thinner and lighter in weight.

[0093] In addition, the joint member 17 is mounted on the side surface 12a1 of the upper member 12 and the side surface 11d1 of the frame 11 and joined, so that the joint can be firmly joined. Therefore, the length L3 of the joint member 17 in the front-rear direction of the vehicle body can be made shorter than the length L4 of the joint member 17 from the rear end to the front end of the vehicle body in the front-rear direction of the vehicle body, so that the length in the front-rear direction of the vehicle body can be shortened.

[0094] (6) The joining member 17 is a panel that is V-shaped when viewed from the side, and is joined to the lower surface of the front end portion 12a of the upper member 12 on the outer side of the vehicle width, and has a side bent flange 17b that is bent in the upward and downward directions on the inner side of the vehicle width. The side bent flange 17b is joined to the outer surface of the protruding portion 11d of the frame 11.

[0095] According to this composition, Fig.10 The load input when colliding with an oncoming vehicle as indicated by arrow Y4 of the bumper beam fastening portion using the nut 18 shown in the figure is distributed to the lower surface of the front end portion 12a of the upper member 12 and the outer surface of the protruding portion 11d (back plate 15) of the frame 11 via the side curved flange 17b as indicated by arrows Y5 and Y6. Therefore, the large load of the SOT collision can be applied to the outer surface of the protruding portion 11d of the frame 11, so that the frame 11 can be bent to absorb the collision energy.

[0096] (7) The joint member 17 includes a first joint member 17d for joining the lower side of the protruding portion 11d (back plate 15) of the frame 11 to the lower side of the front end portion 12a of the upper member 12, and a second joint member 17e for joining the upper side of the protruding portion 11d of the frame 11 to the upper side of the front end portion 12a of the upper member 12.

[0097] According to this structure, the front end portion 12a of the upper member 12 and the protruding portion 11d of the frame 11 are clamped and connected by both the first connecting member 17d and the second connecting member 17e. Therefore, the connection strength of both sides is improved, so even if the upper member 12 is configured as shown by the inclined line L8, the upper member 12 is relatively Fig.13 The horizontal frame 11 indicated by the horizontal line L7 is inclined upward in the middle side view, and the SOT collision load can be easily dispersed in a V-shape as indicated by the horizontal line L7 and the inclined line L8.

[0098] (8) The second joint member 17 e is formed by joining the upper wall 11 j of the protruding portion 11 d of the frame 11 , the outer side wall 11 k of the protruding portion 11 d formed by the back plate 15 , and the inner side wall 12 c of the upper member 12 .

[0099] According to this configuration, a part of the upper wall 11 j of the protruding portion 11 d of the vehicle frame 11 can be supported by the second joint member 17 e , thereby achieving a reduction in weight of the vehicle frame 11 .

[0100] (9) The second joint member 17e is connected to the upper end side of the bulkhead 19 extending in the vehicle body front-rear direction so as to divide the interior of the vehicle frame 11 into left and right in the vehicle width direction.

[0101] According to this configuration, the strength and rigidity of the front end and the protruding portion 11d of the vehicle frame 11 are improved by the bulkhead 19, so that the load can be transmitted to the rear bending points 11g, 11h, and 11i while suppressing deformation due to the SOT collision load.

[0102] (10) The bulkhead 19 extends rearward along the outer wall 11 k while being separated from the outer wall 11 k of the frame 11 . The extended rear end 19 b is connected to the inner wall 11 m of the frame 11 .

[0103] According to this configuration, the SOT collision load ( Figure 1 The load is transferred to the inner and outer walls 11m and 11k of the bending point 11n at the rear through the partition plate 19 and the outer wall 11k. Therefore, the frame 11 can be easily bent into an inner convex shape, etc., and the impact energy can be absorbed.

[0104] (11) The lower end portion 19 a of the bulkhead 19 is joined to the lower end portion of the outer side wall 11 k of the vehicle frame 11 .

[0105] According to this configuration, the protruding portion 11 d of the vehicle frame 11 has a large cross-sectional shape extending vertically, and thus the input amount of the SOT collision (arrow Y1 ) can be increased.

[0106] As mentioned above, the vehicle body structure of this embodiment has been described, but the present invention is not limited thereto, and can be appropriately modified within the scope not departing from the gist of the present invention.

Claims

1. A vehicle front structure having a front side frame extending in the front-rear direction of the vehicle body, wherein the vehicle front structure is characterized in that: The front side frame has: A hat cross-section portion having a flange extending upward and downward on the rear side in the front-rear direction of the vehicle body and having a hat cross-section shape; A first U-shaped cross-sectional portion having a U-shaped cross-sectional shape, which is formed by having a protruding portion extending toward the outside in the vehicle width direction on the front side of the hat cross-sectional portion; A second U-shaped cross-sectional portion is formed by overlapping upper and lower cross-sectional enlarged portions of a rectangular plate formed by separate bodies on the outer wall of the first U-shaped cross-sectional portion in a manner that the cross-sectional shape of the first U-shaped cross-sectional portion in the upper and lower directions is enlarged; and a back plate that closes an opening formed by the first U-shaped cross-section and the second U-shaped cross-section, There is also an upper member, which is arranged on the vehicle width outer side of the front side frame and is curved in an arch shape in the front-rear direction of the vehicle body. The front end portion of the upper member that is inclined downward on the front side is bent toward the inner side of the vehicle width until it reaches 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 protruding portion protruding outward in a trumpet shape at the front end side of the front side frame. The V-shaped space includes a joint member that is connected to the front end and the protruding portion. The joint member is a panel that is V-shaped when viewed from the side, is connected to the lower surface of the front end of the upper member on the vehicle width outer side, and has a side bending flange that is bent in the upward and downward directions on the vehicle width inner side, and is connected to the outer surface of the protruding portion of the front side frame. The upper and lower cross-sectional enlarged portion is formed into a trumpet shape that gradually expands in the upper and lower directions from the rear side of the vehicle body toward the front end of the front side frame, and the input load is transmitted to the hat cross-sectional portion according to the trumpet shape. The hat cross-section portion has a plurality of bending points which become starting points for bending the front side frame in the vehicle width direction in the event of a head-on collision. The bending point is located on the rear side of the first U-shaped cross-section portion and the second U-shaped cross-section portion provided on the front frame.

2. The vehicle body front structure according to claim 1, characterized in that: The upper and lower cross-sectional enlarged portions are configured in a trumpet shape that gradually expands toward the vehicle width outer side from the vehicle body rear side toward the front end of the front side frame.

3. The vehicle body front structure according to claim 1, characterized in that: At least three bending points are provided at intervals from each other in the front-to-back direction.

4. The vehicle body front structure according to claim 1, characterized in that: The joint member includes a first joint member that joins a lower side of the protruding portion of the front side frame to a lower side of the front end portion of the upper member, and a second joint member that joins an upper side of the protruding portion of the front side frame to an upper side of the front end portion of the upper member.

5. The vehicle body front structure according to claim 4, characterized in that: The second joint member is configured by joining an upper wall of a protruding portion of the front side frame, an outer side wall of the protruding portion formed by the back plate, and an inner side wall of the upper member in a vehicle width inner direction.

6. The vehicle body front structure according to claim 4, characterized in that: The second joint member is coupled to an upper end side of a bulkhead extending in the vehicle body front-rear direction so as to partition the interior of the front side frame left-right in the vehicle width direction.

7. The vehicle body front structure according to claim 6, characterized in that: The bulkhead is inside the front side frame, and extends rearward along the outer side wall while being away from the outer side wall of the front side frame, and the extended rear end portion is connected to the inner side wall of the front side frame.

8. The vehicle body front structure according to claim 7, characterized in that: The lower end portion of the bulkhead is coupled to the lower end portion of the outer side wall of the front side frame.

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