Front body structure

Abstract

The present invention aims to suppress a cross-traffic collision with an oncoming vehicle having a front end of a front frame of a vehicle having a height different from that of the front end of the vehicle, and to absorb collision energy generated by a SOT collision outside the front end of the front frame. A vehicle body front structure (10) comprises: a hollow front frame (11) extending in the front-rear direction; a first reinforcing plate (21a, 21b, 21c) having an L-shaped cross-section arranged inside the frame (11); and a second reinforcing plate (22) arranged in front of the first reinforcing plate (21a-21c) inside the frame (11). The frame (11) has a ridge extending in the front-rear direction, and the first reinforcing plates (21a-21c) are arranged in such a way that the ridge of the L-shaped cross-section coincides with the ridge of the frame (11). The second reinforcing plate (22) is configured such that the front end side deviates outward in the vehicle width direction compared to the rear end side, and the rear end side is arranged in the front-rear direction with the front end side of the first reinforcing plates (21a-21c).

Description

Technical Field

[0001] The present invention relates to a vehicle body front structure in which front side frames on both sides of the vehicle body absorb collision energy. Background Art

[0002] As a vehicle body front structure that absorbs collision energy by a front side frame (also referred to as a side frame), there is a technique described in Patent Document 1, for example. This vehicle body front structure is configured such that a reinforcement plate having a U-shaped cross section is overlapped and joined to a side surface on the rear side of a position separated from the front end of the side frame by a predetermined length, thereby reinforcing the side frame. With this structure, even if a so-called micro overlap collision occurs in which a position deviates outward from the axis of the side frame main body, the side frame main body can be deformed together with the reinforcement plate to absorb the impact energy.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 4783761 Summary of the invention

[0006] In the structure of Patent Document 1, the front portion of the side frame from the front end of the side frame to the front end of the reinforcement plate separated by a predetermined length is a structure with no reinforcement plate and only the side frame plate. Therefore, when a small overlap collision occurs in the front portion of the side frame, the front portion of the side frame may be greatly deformed in the vehicle width direction by the collision energy. If the front portion of the frame is greatly deformed, the deformation of the reinforcement plate joint portion becomes small and the collision energy cannot be fully absorbed.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle body front structure capable of absorbing collision energy without causing a front portion of a front side frame to deform significantly during a minor overlap collision.

[0008] In order to achieve the above-mentioned purpose, the vehicle body front structure of the present invention is characterized in that it comprises: a hollow front side frame extending in the front-to-back direction; a first reinforcing plate with an L-shaped cross-section arranged inside the front side frame; and a second reinforcing plate arranged inside the front side frame on the front side of the first reinforcing plate, the front side frame having a ridgeline extending in the front-to-back direction, the first reinforcing plate being arranged so that the ridgeline of the L-shaped cross-section coincides with the ridgeline of the front side frame, the front end side of the second reinforcing plate being deviated toward the outside in the vehicle width direction compared with the rear end side, and the rear end side and the front end side of the first reinforcing plate are arranged in the front-to-back direction.

[0009] Effects of the Invention

[0010] According to the present invention, it is possible to obtain a vehicle body front structure capable of absorbing collision energy without causing a large deformation of the front portion of the front side frame during a minor overlap collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a side view of the outer side in the vehicle width direction of a front side frame of the vehicle body front structure of the automobile according to the embodiment of the present invention.

[0012] Figure 2 It is a perspective view showing a plurality of first reinforcing plates having an L-shaped cross section arranged within a U-shaped cross section of a front side frame.

[0013] Figure 3 It is a perspective view showing a plurality of first reinforcement plates and first and second bulkheads having L-shaped cross sections arranged within a U-shaped cross section of a front side frame.

[0014] Figure 4 yes Figure 3 IV-IV cross-sectional view.

[0015] Figure 5 It is a side view of the vehicle body front structure of the automobile according to the present embodiment.

[0016] Figure 6 It means by Figure 5 The arrow IV 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.

[0017] Figure 7 It means that Figure 6 A perspective view of the structure with the connecting plate removed is shown.

[0018] Figure 8 yes Figure 5 IV-IV cross-sectional view.

[0019] Fig. 9 Observe from above Figure 5 Cross-sectional view of section VV.

[0020] Fig.10 It is a top view showing the three bending points of the front side frame.

[0021] Fig.11 It is a perspective view showing the extension portion of the bumper beam.

[0022] Fig.12 It is a side view showing a state where the front side frame is bent upward.

[0023] Fig.13 It is a perspective view showing a bulkhead connected to the front side frame.

[0024] Fig.14 yes Fig.13XIV-XIV section view.

[0025] Description of Reference Numerals

[0026] 10 Front structure

[0027] 11 Front side frame

[0028] 11A Front side frame bent upward

[0029] 11Z sawtooth front frame

[0030] 11a, 11b Flange

[0031] 11c U-shaped section

[0032] 11e U-shaped cross-section expansion

[0033] 11e1 Upper wall

[0034] 11e2 Inner wall

[0035] 11e3 Sloped Wall

[0036] 11e4 Outer wall

[0037] 11g, 11h, 11i, 11n bending points

[0038] 11j1, 11j2 ridges

[0039] 11k Closed Section

[0040] 12 Upper component

[0041] 12a Front end

[0042] 13 Bumper beam extension

[0043] 13a Board assembly

[0044] 13b Box type

[0045] 15 Back Panel

[0046] 18 Rear panel

[0047] 21a, 21b, 21c First reinforcement plate

[0048] 22 Second reinforcement plate

[0049] 22a Lower end portion of the second reinforcing plate

[0050] 22b Rear end portion of the second reinforcing plate

[0051] 25 Partition

[0052] 25a First partition

[0053] 25b Second partition

[0054] 25a1, 25b1 bulge

[0055] 25a2 Periphery

[0056] 25a3 Upper extension

[0057] 25a4 Lower extension DETAILED DESCRIPTION

[0058] <Structure of Embodiment>

[0059] 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.

[0060] Figure 1 It is a side view of the outer side in the vehicle width direction of the front side frame 11 (frame 11) which is the vehicle body front structure of the automobile according to the present embodiment. Figure 2 The figure is a perspective view showing a plurality of first reinforcing plates 21 a , 21 b , and 21 c having an L-shaped cross section disposed within the U-shaped cross section of the vehicle frame 11 . Figure 3 The figure is a side view showing a plurality of first reinforcing plates 21 a , 21 b , and 21 c , a first bulkhead 25 a , and a second bulkhead 25 b having an L-shaped cross section arranged in the U-shaped cross section of the vehicle frame 11 . Figure 4 yes Figure 3 IV-IV cross-sectional view.

[0061] like Figure 1 As shown, the vehicle body front structure 10 is connected to a first reinforcement plate 21 and a second reinforcement plate 22 in sequence from the rear side to the front end of the vehicle body in a U-shaped cross section that opens to the outer side (also simply referred to as the outer side) in the vehicle width direction of the vehicle frame 11 that is linearly extended on both sides of the vehicle body (see FIG. Figure 7 The first reinforcing plate 21 is a reinforcing plate for reinforcing the vehicle body rear side of the vehicle body frame 11 , and the second reinforcing plate 22 is a reinforcing plate for reinforcing the vehicle body front side of the vehicle body frame 11 .

[0062] The second reinforcing plate 22 on the front side of the vehicle body is bent (deviation) outward in a curved shape as it moves from the rear end side 22b toward the front end side (see Fig. 9 ) is in the shape of a letter U under cross-sectional observation.

[0063] The first reinforcing plate 21 is composed of a plurality of first reinforcing plates 21a, 21b, and 21c. The first reinforcing plate 21a is coupled to the lower side of the U-shaped cross section of the vehicle frame 11, and is coupled in a state where the front end of the first reinforcing plate 21a and the rear end of the second reinforcing plate 22 are in contact and aligned. The first reinforcing plates 21b and 21c are coupled to the upper side of the U-shaped cross section of the vehicle frame 11.

[0064] like Figure 2 As shown, the first reinforcing plate 21a at the lower side has an L-shaped cross section. Figure 4 As shown in the cross-sectional view, the ridge line formed by the corner on the lower side of the L-shaped cross section of the first reinforcing plate 21a is matched with the ridge line 11j1 formed by the corner formed by the vertical surface and the horizontal surface on the lower side of the U-shaped cross section of the frame 11.

[0065] like Figure 3 As shown, the first reinforcing plates 21b and 21c on the upper side form an L-shaped cross-section. Figure 4 As shown by the first reinforcing plate 21b as a representative, the ridgeline 11j2 formed by the upper corner of the L-shaped cross section of the first reinforcing plate 21b is matched with the ridgeline 11j2 formed by the upper corner inside the U-shaped cross section of the frame 11 and connected.

[0066] like Figures 1 to 4 As shown, a first partition plate 25a and a second partition plate 25b are provided in the hollow portion of the vehicle frame 11, which are wall-shaped and divide the hollow portion along the front and rear directions. The first partition plate 25a and the second partition plate 25b have flanges at the top, bottom, left and right sides, and the flanges are connected to the top and bottom surfaces and the left and right surfaces of the vehicle frame 11. In addition, the first partition plate 25a is provided across the rear end portion of the upper first reinforcing plate 21b and the middle portion of the lower first reinforcing plate 21a. The second partition plate 25b is provided across the middle portion of the upper first reinforcing plate 21c and the rear end portion of the lower first reinforcing plate 21a. As shown in FIG. Figure 4 As shown, the opening of the frame 11 is closed by a back plate 15 which will be described later.

[0067] then, Figure 5 It is a side view of the vehicle frame 11 from the inner side in the vehicle width direction. Figure 6 It means by Figure 5 The arrow IV 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 7 It means that Figure 6 A perspective view of the structure with the connecting plate removed is shown. Figure 8 yes Figure 5 VIII-VIII sectional view of the invention. Fig. 9 Observe from above Figure 5 A cross-sectional view of section IX-IX.

[0068] like Figure 5As shown, the vehicle body front structure 10 has an upper member 12 extending from the outer sides of the vehicle 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. Figure 7 As shown, the front end side of the upper member 12 in the vehicle body is arranged adjacent to the front end side of the vehicle frame 11 .

[0069] Figure 5 In the vehicle frame 11 shown in FIG. 1 , the cross-sectional shape of the rear side is a so-called hat shape. Specifically, the rear side of the vehicle frame 11 has a substantially U-shaped cross-sectional shape (see FIG. 1 ). Figure 8 ) and flanges 11a and 11b extending upward and downward from the opening side end of the U-shaped cross-section 11c. Figure 7 As shown, the front side of the vehicle frame 11 is a U-shaped cross-section enlarged portion 11e that is continuous from the U-shaped cross-section portion 11c and expands in the vehicle width direction and the vertical direction. The U-shaped cross-section portion 11c and the U-shaped cross-section enlarged portion 11e correspond to the "vehicle frame body" in the claims.

[0070] The U-shaped cross-section enlarged portion 11e does not have flanges 11a and 11b like the U-shaped cross-section portion 11c, but has an upper wall 11e1, an inner wall 11e2 on the inner side in the vehicle width direction (also simply referred to as the inner side), an inclined wall 11e3 inclined downward from the inner wall 11e2 to the outer side, and a back plate 15 (see FIG. 1 ) for closing the outer openings of both the U-shaped cross-section enlarged portion 11e and the U-shaped cross-section portion 11c. Fig.11 ) formed outer side wall 11e4. In addition, both the U-shaped cross-section enlarged portion 11e and the U-shaped cross-section portion 11c constitute the frame body described in the technical solution.

[0071] The frame 11 has a hollow portion in the shape of a hollow frame extending in the front-rear direction of the vehicle body (also referred to as the front-rear direction) by closing the opening with the back plate 15. Figure 6 As shown, the front end of the U-shaped cross-section enlarged portion 11 e of the frame 11 and the front end of the upper member 12 are connected by a connecting plate 16 .

[0072] In addition, Figure 7 A second reinforcing plate 22 is fixed to the inside of the U-shaped cross-section enlarged portion 11e having a hollow frame shape so as to divide the inside into left and right parts in the vehicle width direction and to extend vertically in the vehicle body front-rear direction.

[0073] The second reinforcing plate 22 is separated from the outer side wall 11e4 in the vehicle frame 11 and extends toward the rear side along the outer side wall 11e4. Figure 1 The rear end portion 22b is connected to the U-shaped cross section and is connected to the front end of the first reinforcing plate 21 while being located at the bending point 11n of the frame 11 indicated by the dotted line.

[0074] like Fig. 9 As shown, the second reinforcing plate 22 is inclined outward in the vehicle width direction from the inner wall of the U-shaped cross-section portion 11 c toward the front end of the U-shaped cross-section enlarged portion 11 e , and forms a closed cross-section 11 k continuous with the hollow portion between it and the back plate 15 .

[0075] like Figure 7 As shown, the lower end 22a of the second reinforcing plate 22 is connected to the lower end of the outer wall 11e4 of the vehicle frame 11. By this connection, the U-shaped cross-section enlarged portion 11e on the vehicle body front side of the vehicle frame 11 has a large cross-sectional shape extending upward and downward.

[0076] like Figure 5 As shown in FIG. 1 , the U-shaped cross-section enlarged portion 11e is formed into a trumpet shape that gradually expands in the vertical direction from the rear side of the vehicle body toward the front end of the frame 11. More specifically, the upper surface of the frame 11 extends forward and backward at a nearly constant height, and the lower surface of the frame 11 is inclined in a manner that decreases toward the front end. Figure 7 As shown, a second reinforcing plate 22 is provided in the vehicle frame 11 along the trumpet shape that opens upward and downward. With this configuration, when a vehicle crosses an oncoming vehicle, the load input (arrow Y1) is smoothly transmitted along the trumpet shape reinforced by the second reinforcing plate 22 to the U-shaped cross-section portion 11c on the rear side of the vehicle frame 11.

[0077] Moreover, if Fig. 9 As shown, the U-shaped cross-section expansion portion 11e forms a trumpet shape that gradually opens outward from the rear side of the vehicle body toward the front end of the frame 11. In more detail, the surface on the inner side of the vehicle width of the frame 11 extends straight in the front-to-back direction, and the surface on the outer side of the vehicle width of the frame 11 is inclined in a manner that it is located on the outer side of the vehicle width as it approaches the front end. Along this trumpet shape that opens outward, a second reinforcement plate 22 is provided in the frame 11. With this structure, when an oncoming vehicle has a slight overlapping collision with the upper member 12, the oblique upward load input generated by the collision is smoothly transmitted along the trumpet shape reinforced by the second reinforcement plate 22, toward the bending points 11g, 11h, 11i ( Fig.10 ) centralized transmission.

[0078] As observed from above Fig.10 As shown in the top view of the vehicle frame 11, the U-shaped cross-section 11c of the vehicle frame 11 has at least three bending points 11g, 11h, and 11i in the front-rear direction of the vehicle body. The bending points 11g, 11h, and 11i are arranged in this order from the front. The bending points 11n and 11i are arranged on the outer side of the vehicle width of the vehicle frame 11, and the bending point 11h is arranged on the inner side of the vehicle width of the vehicle frame 11. Each bending point 11g, 11h, and 11i is a concave part in the shape of a U, and a small overlapping collision load in the direction indicated by the arrow Y2 is absorbed from the second reinforcing plate 22 ( Figure 1) to the first reinforcing plates 21a, 21b, 21c ( Figure 1 ) is transmitted and bent into a serrated shape along the width of the vehicle.

[0079] The first reinforcing plates 21a, 21b, 21c (at least one of them) are arranged along Figure 4 At least one ridgeline 11j1 or ridgeline 11j2 of the vehicle frame 11 is arranged. In the middle of the first reinforcing plates 21a, 21b, 21c extending in the vehicle front-rear direction, a partition 25 composed of a first partition 25a and a second partition 25b is connected across both the first reinforcing plates 21a, 21b, 21c and the U-shaped cross section of the vehicle frame 11. The above-mentioned bending points 11h and 11i as fragile parts are formed on the vehicle frame 11 near these partitions 25a and 25b. In addition to the bent shape as the bending point, the fragile part can also be a rib, a hole, etc.

[0080] By forming a weak portion near the bulkhead 25 of the reinforcing frame 11 in this manner, the force during a collision is concentrated on the weak portion near the reinforced portion by the bulkhead 25, so that the frame 11 can be reliably bent together with the first reinforcing plates 21a, 21b, 21c.

[0081] like Fig.10 As shown by the dotted line 11Z, the frame 11 is bent in a zigzag shape together with the first reinforcing plates 21a, 21b, and 21c. To explain further, when a collision occurs, the bending point 11g of the U-shaped cross-section portion 11c is bent together with the first reinforcing plates 21a and 21b at the vehicle body inner side position in the vehicle width direction as shown by the arrow Yg. Moreover, the bending point 11h is bent together with the first reinforcing plates 21a, 21b, and 21c at the vehicle body outer side position in the vehicle width direction as shown by the arrow Yh, thereby bending in a zigzag shape like the frame 11Z.

[0082] In addition to the above, the first reinforcing plates 21a, 21b, 21c may be arranged along Fig.14 At least two ridges 11j1 and 11j2 of the vehicle frame 11 are arranged. In the middle of the first reinforcing plates 21a, 21b, and 21c extending in the vehicle front-rear direction, a partition 25 composed of a first partition 25a and a second partition 25b is connected across both the first reinforcing plates 21a, 21b, and 21c and the U-shaped cross section of the vehicle frame 11. In the vicinity of these partitions 25a and 25b, the above-mentioned bending points 11h and 11i as fragile parts are formed on the vehicle frame 11.

[0083] With this configuration, even in a micro-lap collision, the first reinforcing plates 21 a , 21 b , and 21 c are bent together with the two ridge lines 11 j 1 and 11 j 2 of the vehicle frame 11 , thereby increasing the amount of collision energy absorbed.

[0084] like Figure 3 As shown, the bulkhead 25 includes at least a first bulkhead 25a as an engine frame fastening portion, and a second bulkhead 25b as a sub-frame fastening portion.

[0085] The first partition plate 25a has a bulging portion 25a1, which has a cylindrical hollow inside and an opening at the top, and bulges outward in the vehicle width direction. The nut 26 is inserted into the hollow from the opening of the bulging portion 25a1 and is fitted and fixed. The nut 26 has a shape in which a circular ring portion is fixed to a cylindrical shape having a threaded hole formed inside, and the circular ring portion is exposed from the bulging portion 25a1 and fixed. The bolt of the engine mount is screwed and tightened from the circular ring portion of the nut 26.

[0086] The second partition plate 25b has a bulging portion 25b1, which has a cylindrical hollow inside and is open at the bottom and bulges outward. The nut 27 is inserted into the hollow from the opening of the bulging portion 25b1 and is fitted and fixed. The annular portion of the nut 26 is exposed from under the bulging portion 25b1 and is fixed. The bolt of the subframe is screwed and tightened from the annular portion of the nut 27.

[0087] Fig.11 This is a perspective view of the frame 11 on the left side of the vehicle body as viewed from the right front side. A bumper beam extension (also referred to as an extension) 13 is fixed to the front surface of a connecting plate 16 that connects the front end of the frame 11 and the front end of the upper member 12, and is represented by cutting off the box-shaped appearance in the vehicle width direction. The extension 13 is formed by fixing a box-shaped portion 13c in front of a polygonal plate member 13a, the plate member 13a being fixed to the front surface of the connecting plate 16 and having the same shape as the connecting plate 16, and the box-shaped portion 13c is divided into a cross-sectional glasses shape by a dividing wall 13b extending in the up-down direction.

[0088] like Fig. 9 As shown, the partition wall 13b is disposed at a position facing the vertically extending front end of the second reinforcing plate 22. The collision load from an oncoming vehicle in front of the vehicle body is transmitted from the partition wall 13b of the extension portion 13 to the second reinforcing plate 22 by the relative state of the two.

[0089] Figure 2 The material of the first reinforcing plates 21a, 21b, and 21c shown is preferably changed as follows depending on the weight of the vehicle body, that is, depending on whether the vehicle body is light or heavy.

[0090] That is, for a light vehicle body, it is preferred that the first reinforcing plates 21a, 21b, 21c having an L-shaped cross section have a plate thickness of 1.0 to 2.0 mm and be made of a general steel plate having a tensile strength of 270 MPa.

[0091] For a heavy vehicle body, the first reinforcing plates 21a, 21b, 21c having an L-shaped cross section are preferably formed with a plate thickness of 1.0 to 2.0 mm and a material of a high-strength steel plate having a tensile strength of 440 to 980 MPa.

[0092] like Figure 3 As shown, among the first reinforcing plates 21a, 21b, and 21c, the front end of the lower first reinforcing plate 21a protrudes forward by a predetermined length L1 compared to the front end of the upper first reinforcing plate 21b.

[0093] like Fig.12 As shown in FIG. 1 , the vehicle frame 11 is joined to the front end side of the rear wall member 18 which is inclined upward from the bottom of the floor panel 31. In addition, the rear wall member 18 is arranged from the bottom of the floor panel 31 along the lower surface of the front wall lower member 32, which is arranged standing on the front side of the instrument panel 33 from which the steering wheel 34 protrudes. That is, the vehicle frame 11 is bent in a manner extending horizontally and forward above the floor panel 31. Therefore, there is a concern that the front end of the vehicle frame 11 may be deformed upward as shown by the reference numeral 11A due to a small overlap collision.

[0094] However, the front end of the lower first reinforcing plate 21a of the vehicle frame 11 protrudes forward by a predetermined length compared to the front end of the upper first reinforcing plate 21b. This configuration prevents the vehicle frame 11 from being lifted and deformed as indicated by reference numeral 11A during a collision.

[0095] like Figure 4 As shown, among the first reinforcing plates 21a, 21b, and 21c, the rear ends of the upper first reinforcing plates 21b and 21c and the rear end of the lower first reinforcing plate 21a are located at the same position in the front-rear direction of the vehicle body and are arranged at the third bending point 11i (refer to Fig.10 ). With this configuration, the rearmost bending point 11i among the bending points 11g, 11h, and 11i is easily bent due to the difference in rigidity between the parts with and without the first reinforcing plates 21a, 21b, and 21c. In addition, the upper first reinforcing plate 21b constitutes the upper first reinforcing plate described in the technical solution. The lower first reinforcing plate 21a constitutes the lower first reinforcing plate described in the technical solution.

[0096] like Fig.13 As shown in the figure, the peripheral edge portion 25a2 of the first partition plate 25a holding the nut 26 on the bulged portion 25a1 overlaps and joins with the upper and lower first reinforcing plates 21a and 21b disposed in the U-shaped cross section of the frame 11. The first partition plate 25a has an upper extension portion 25a3 extending with a predetermined width in a state overlapping with the upper flange 11a of the frame 11, and a lower extension portion 25a4 extending with a predetermined width in a state overlapping with the lower flange 11b of the frame 11.

[0097] As Fig.13 XIV-XIV section view Fig.14 As shown, the upper extension portion 25a3 and the lower extension portion 25a4 of the first partition plate 25a are sandwiched and joined between the upper and lower flanges 11a and 11b of the frame 11 and the back plate 15.

[0098] like Fig.12 As shown, the rear end of the frame 11 is joined to the front end side of the rear wall member 18 extending from the inclined surface of the front wall lower member 32 to the lower surface of the floor panel 31. With such a structure, the frame 11 only needs to be made into a horizontal straight portion for different vehicle models, so the mold becomes cheap.

[0099] <Effects of implementation>

[0100] 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 includes a front side frame 11 extending in the vehicle body front-rear direction on the inner side in the vehicle width direction.

[0101] (1) The vehicle body front structure 10 includes: a hollow front side frame 11 extending in the front-rear direction; first reinforcing plates 21a, 21b, 21c having an L-shaped cross-sectional shape disposed inside the frame 11; and a second reinforcing plate 22 disposed inside the frame 11 on the front side of the first reinforcing plates 21a to 21c. The frame 11 has a ridgeline extending in the front-rear direction, and the first reinforcing plates 21a to 21c are disposed so that the ridgeline of the L-shaped cross-sectional shape overlaps with the ridgeline of the frame 11. The front end side of the second reinforcing plate 22 is offset outward in the vehicle width direction compared to the rear end side, and the rear end side is aligned with the front end sides of the first reinforcing plates 21a to 21c in the front-rear direction.

[0102] According to this configuration, when a small overlap collision occurs on the front side of the vehicle frame 11, since the second reinforcing plate 22 is disposed on the front side of the vehicle frame 11, the front portion of the vehicle frame 11 does not deform significantly, and the small overlap collision load can be transmitted from the second reinforcing plate 22 to the first reinforcing plates 21a, 21b, 21c arranged in parallel with the second reinforcing plate 22. Through this transmission, the vehicle frame 11 deforms together with the first reinforcing plates 21a, 21b, 21c and can absorb the collision energy. That is, when a small overlap collision occurs, the front portion of the vehicle frame 11 does not deform significantly, and can absorb the collision energy.

[0103] (2) The vehicle frame 11 includes a vehicle frame body having a U-shaped cross-sectional shape and opening outward in the vehicle width direction, which is composed of a U-shaped cross-sectional portion 11c and a U-shaped cross-sectional enlarged portion 11e, and a back plate 15 that closes the opening and forms a hollow portion extending in the vehicle front-rear direction. The rear end of the second reinforcing plate 22 abuts against the inner side wall of the vehicle frame body, and the second reinforcing plate 22 is inclined outward in the vehicle width direction from the rear end toward the front end, forming a closed cross section 11k ( Fig. 9 ), the closed cross section 11k is continuous with the hollow portion.

[0104] According to this configuration, the small overlap collision load is transmitted from the closed cross section 11 k of the front portion of the vehicle frame 11 to the rear portion, so that deformation of the rear portion of the vehicle frame 11 can be promoted.

[0105] (3) The cylindrical bumper beam extension 13 is provided at the front end of the vehicle frame 11, and the front end of the second reinforcing plate 22 is arranged at a position overlapping the partition wall 13b that partitions the hollow portion of the extension 13 in the vehicle width direction.

[0106] According to this configuration, the small overlap collision load is efficiently transmitted from the partition wall 13 b of the overhanging portion 13 to the second reinforcing plate 22 , thereby promoting deformation of the ridgelines of the second reinforcing plate 22 and the first reinforcing plates 21 a , 21 b , 21 c .

[0107] (4) The first reinforcing plates 21a, 21b, 21c are arranged on the frame 11 along at least one ridge 11j1 or ridge 11j2 of the frame 11, and a partition 25 is combined in the middle of the first reinforcing plates 21a, 21b, 21c in a manner that is bridged between the first reinforcing plates 21 and the frame 11, and a fragile portion (bending points 11h, 11i) is formed near the combined partition 25.

[0108] According to this configuration, a weak portion is formed near the bulkhead 25 that reinforces the vehicle frame 11, so that the force during a collision is concentrated on the weak portion near the portion reinforced by the bulkhead 25. Therefore, the vehicle frame 11 can be reliably bent by a collision, and the first reinforcing plates 21a, 21b, and 21c can also be bent at the ridgeline together with the vehicle frame 11, so that the amount of collision energy absorbed can be increased.

[0109] (5) The partition plate 25 includes at least a first partition plate 25a as an engine frame fastening portion and a second partition plate 25b as a subframe fastening portion. The first partition plate 25a has a nut 26 with a threaded hole on its upper surface, and the second partition plate 25b has a nut 27 with a threaded hole on its lower surface.

[0110] According to this configuration, the bolts of the engine frame are screwed and tightened on the nuts 26 of the first bulkhead 25a, and the bolts of the subframe are screwed and tightened on the nuts 27 of the second bulkhead 25b. In this state, the frame 11 can be bent at the bending points 11g, 11h, and 11i, which are weak parts. Therefore, the absorption of collision energy can be promoted over the entire length of the frame 11.

[0111] (6) The vehicle frame 11 has two upper and lower ridges 11j1 and 11j2 extending in the front-to-back direction. The first reinforcing plates 21a, 21b, and 21c have an upper first reinforcing plate 21b with an L-shaped cross-section arranged along the upper ridge 11j2, and a lower first reinforcing plate 21a with an L-shaped cross-section arranged along the lower ridge 11j1. A partition 25 is provided in the middle position in the front-to-back direction of the first reinforcing plates 21a, 21b, and 21c for dividing the hollow portion of the vehicle frame 11 in the front-to-back direction. The vehicle frame 11 has a fragile portion (bending points 11h and 11i) near the partition 25.

[0112] According to this configuration, when a micro-lap collision occurs, the first reinforcing plates 21a, 21b, and 21c are bent at the two ridge lines 11j1 and 11j2 of the vehicle frame 11, so that the amount of impact energy absorbed can be further increased.

[0113] (7) The front end of the lower first reinforcing plate 21 a is arranged forward of the front end of the upper first reinforcing plate 21 b.

[0114] According to this configuration, the front end of the first reinforcing plate 21a on the lower side of the vehicle frame 11 protrudes forward by a predetermined length compared to the front end of the first reinforcing plate 21b on the upper side, so that the vehicle frame 11 is prevented from being lifted and deformed as shown by reference numeral 11A in the event of a collision (see Fig.12 11A), which can promote the zigzag deformation of the frame 11 in the vehicle width direction at the three bending points 11g, 11h, and 11i.

[0115] (8) The fragile portion is a plurality of bending points 11g, 11h, and 11i formed separately from each other along the front-to-rear direction on the vehicle frame 11, and the rear end of the upper first reinforcing plate 21b and the rear end of the lower first reinforcing plate 21a are arranged at the same position in the front-to-rear direction of the vehicle body and at the same position as the rearmost bending point among the plurality of bending points.

[0116] According to this structure, the rearmost bending point 11i among the bending points 11g, 11h, and 11i is easy to bend due to the difference in rigidity between the parts with and without the first reinforcing plates 21a, 21b, and 21c, thereby further promoting the bending at the three bending points 11g, 11h, and 11i.

[0117] (9) The vehicle frame 11 has flanges 11a and 11b extending upward and downward from the upper and lower edges of the U-shaped cross section. The first baffle 25a, which is one of the baffles 25 (the first baffle 25a and the second baffle 25b), has an upper extension portion 25a3 extending to a predetermined width in a state of overlapping with the upper flange 11a, and a lower extension portion 25a4 extending to a predetermined width in a state of overlapping with the lower flange 11b. The partition 25 has an internal retaining nut 26 at the center in the vehicle width direction, and the peripheral edge portion 25a2 of the first partition 25a overlaps and is joined to the first reinforcing plates 21a, 21b arranged up and down in the U-shaped cross-section of the frame 11, and the upper extension portion 25a3 and the lower extension portion 25a4 are clamped and joined between the flanges 11a, 11b on the upper and lower sides of the frame 11 and the back plate 15 that is joined to the flanges 11a, 11b and closes the opening of the U-shaped cross-section.

[0118] According to this configuration, the bulkhead 25 can be easily assembled to the vehicle frame 11 reinforced by the first reinforcing plates 21 a and 21 b , and the engine frame and the subframe can be bolted to the bulkhead 25 at any position of the vehicle frame 11 .

[0119] 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 body front structure, characterized in that: have: A hollow front side frame extending in the front-rear direction; A first reinforcing plate having an L-shaped cross section and disposed inside the front side frame; and A second reinforcing plate is disposed inside the front side frame on the front side of the first reinforcing plate and reinforces the vehicle body front side of the front side frame. The front side frame has a ridgeline extending in the front-rear direction and forms a trumpet shape that gradually opens outward from the rear side of the vehicle body toward the front end. The second reinforcing plate is arranged in the front frame along the trumpet shape. The first reinforcing plate is arranged so that the ridgeline of the L-shaped cross-sectional shape coincides with the ridgeline of the front side frame. The front end side of the second reinforcing plate is offset outward in the vehicle width direction compared to the rear end side, and the rear end side is aligned with the front end side of the first reinforcing plate in the front-rear direction. The front side frame includes a frame body with a U-shaped cross section opening outward in the vehicle width direction, and a back plate that closes the opening to form a hollow portion extending in the vehicle front-rear direction. The rear end of the second reinforcing plate abuts against the inner side wall of the frame body, and the second reinforcing plate is inclined outward in the vehicle width direction from the rear end toward the front end to form a closed section between the second reinforcing plate and the back plate, and the closed section is continuous with the hollow portion.

2. The vehicle body front structure according to claim 1, characterized in that: A cylindrical bumper beam extension is provided at the front end of the front side frame. The front end of the second reinforcement plate is arranged at a position overlapping with a partition wall that partitions the hollow portion of the bumper beam extension in the vehicle width direction in the vehicle width direction.

3. The vehicle body front structure according to claim 1, characterized in that: The first reinforcing plate is arranged on the front frame along at least one ridgeline of the front frame, a bulkhead is connected to the first reinforcing plate in the middle of the first reinforcing plate so as to bridge the first reinforcing plate and the front frame, and a weak portion is formed near the bulkhead.

4. The vehicle body front structure according to claim 3, characterized in that: The partition at least includes a first partition as an engine frame fastening part and a second partition as a subframe fastening part. The first partition has a nut with a threaded hole on the upper surface, and the second partition has a nut with a threaded hole on the lower surface.

5. The vehicle body front structure according to claim 1, characterized in that: The front frame has two upper and lower ridges extending in the front-rear direction. The first reinforcing plate includes an upper first reinforcing plate having an L-shaped cross-sectional shape arranged along the upper ridgeline, and a lower first reinforcing plate having an L-shaped cross-sectional shape arranged along the lower ridgeline. A partition plate is provided at a middle position of the first reinforcing plate in the front-rear direction to divide the hollow portion of the front side frame in the front-rear direction. The front side frame has a fragile portion near the bulkhead.

6. The vehicle body front structure according to claim 5, characterized in that: The front end of the lower first reinforcing plate is arranged forward of the front end of the upper first reinforcing plate.

7. The vehicle body front structure according to claim 5, characterized in that: The fragile portion is a plurality of bending points formed on the front frame in a spaced-apart manner along the front-rear direction. The rear end of the upper first reinforcing plate and the rear end of the lower first reinforcing plate are arranged at the same position in the front-rear direction of the vehicle body and at the same position as the rearmost bending point among the plurality of bending points.

8. The vehicle body front structure according to claim 1, characterized in that: The front side frame has flanges extending upward and downward from upper and lower edges of the U-shaped cross section. A partition plate having an upper extension portion and a lower extension portion, wherein the upper extension portion extends to a predetermined width in a state of overlapping with an upper flange, and the lower extension portion extends to a predetermined width in a state of overlapping with a lower flange, The partition has an internal retaining nut at the center in the vehicle width direction, and the peripheral edge of the partition overlaps and is joined to the first reinforcing plate arranged up and down in the U-shaped cross-section of the front side frame, and the upper extension portion and the lower extension portion are clamped and joined between the flanges on the upper and lower sides of the front side frame and the back plate that is joined to the flanges to close the opening of the U-shaped cross-section.

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