Front structure of vehicle

Abstract

To assemble crash boxes to predetermined positions of a bumper reinforcement more easily.SOLUTION: A front structure of a vehicle has: a pair of front side members disposed at an interval in a vehicle width direction W; a pair of crash boxes 20 located in front of the front side members; a support member; and a bumper reinforcement 50. The support member includes: a support member body located between the pair of crash boxes; and a pair of extension portions 35 extending outward in the vehicle width direction W from the support member body and located on both sides of the support member body in the vehicle width direction W. The bumper reinforcement is attached to front ends of the pair of crash boxes. Each extension portion has a first guide portion 40 and a second guide portion 45 which respectively have inclined surfaces 42a, 47a inclining relative to a front-back direction L and which engage with the front end of the crash box to guide the crash box to an attachment position.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a front structure of a vehicle. [Background technology]

[0002] Patent Document 1 describes a vehicle front structure. The vehicle front structure described in Patent Document 1 includes a pair of front side members located on both sides in the vehicle width direction and a pair of crash boxes respectively connected to the front ends of the pair of front side members. The vehicle front structure also includes bumper reinforcements connected to the front ends of the pair of crash boxes. The crash boxes have a cylindrical main body portion, a first connecting piece protruding forward from an upper edge of the front end of the main body portion, and a second connecting piece protruding downward from a lower edge of the front end of the main body portion. A second flange portion is provided at the rear end of the main body portion. The first connecting piece and the second connecting piece are provided with second upper hole portions and second lower hole portions, respectively. The bumper reinforcement is provided with first upper holes and first lower holes communicating with the second upper hole and second lower hole, respectively. The bumper reinforcement is fastened to the pair of crash boxes by attaching nuts to bolts inserted through the first upper hole and second upper hole and to bolts inserted through the first lower hole and second lower hole, respectively. The second flange portion is fastened by a bolt to a first flange portion provided at the front end portion of the front side member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-59415 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional vehicle front structures including the structure described in Patent Document 1, there is variation in the processing accuracy and assembly accuracy of the front side members and the processing accuracy and assembly accuracy of the crash boxes. This can cause the first upper hole and the first lower hole of the bumper reinforcement to be misaligned with the second upper hole and the second lower hole of the crash box, making assembly difficult.

[0005] Therefore, in consideration of the above-mentioned variations, the shapes of the first upper hole and the first lower hole are set larger than the second upper hole and the second lower hole, respectively, so that the bumper reinforcement can be assembled to the crash box. However, even in this case, there is still a large variation in the position of the front end of the crash box relative to the bumper reinforcement.

[0006] This problem becomes even more pronounced in vehicles such as electric vehicles (BEVs) where the length of the crash box in the front-to-rear direction is large. [Means for solving the problem]

[0007] Various aspects of the vehicle front structure for solving the above problems will be described. [Aspect 1] a pair of body frames arranged at a distance from each other in the vehicle width direction; a pair of crash boxes located forward of the body frames in the vehicle's longitudinal direction and attached to the body frames; a support member located between the pair of crash boxes, and the support member having a pair of extending portions extending outward from the support member main body in the vehicle width direction and positioned on either side of the support member main body in the vehicle width direction; and a bumper reinforcement extending in the vehicle width direction and attached to front ends of the pair of crash boxes, wherein the extending portions have inclined surfaces that are inclined with respect to the longitudinal direction and have guide portions that engage with the front ends of the crash boxes to guide the crash boxes to their installation positions.

[0008] According to the above configuration, the guide portion engages with the front end of the crash box, and the crash box is guided along the inclined surface of the guide portion to the mounting position. This reduces variation in the position of the front end of the crash box, i.e., the position of the portion of the crash box where the bumper reinforcement is mounted. This makes it easier to assemble the crash box in the specified position on the bumper reinforcement.

[0009] [Aspect 2] The crash box has a cylindrical portion extending in the fore-and-aft direction, and a connecting portion connected to the front end of the cylindrical portion and protruding toward the outer periphery of the cylindrical portion, and two hole-shaped or aperture-shaped engageable portions are provided on the front end surface of the connecting portion at intervals in the vehicle width direction, and the two guide portions are inserted into the two engageable portions.This is the front structure of a vehicle described in [Aspect 1].

[0010] According to the above configuration, the two guide portions are inserted into the two hole-shaped or slot-shaped engaged portions, thereby guiding the crash box along the inclined surface in the vehicle width direction to the mounting position. Furthermore, the two guide portions are engaged with the two engaged portions, thereby restricting the relative movement of the crash box with respect to the support member. Therefore, the crash box can be fixed in the mounting position.

[0011] [Aspect 3] The crash box has a cylindrical portion extending in the fore-and-aft direction and a connecting portion connected to the front end of the cylindrical portion, and the connecting portion has a missing portion that does not protrude radially outward of the cylindrical portion, and the guide portion has a pair of inclined surfaces that sandwich the missing portion from the inner and outer sides of the cylindrical portion in the vehicle width direction, and an opposing surface that faces the front end of the missing portion.This is the front structure of a vehicle described in [Aspect 1].

[0012] According to the above configuration, the guide portion engages with the recessed portion of the connecting portion, thereby guiding the crash box along the inclined surface in the vehicle width direction to the mounting position. Furthermore, the recessed portion is surrounded by the pair of inclined surfaces and the opposing surface, restricting relative movement of the crash box with respect to the support member. This allows the crash box to be fixed in the mounting position.

[0013] [Aspect 4] A front structure for a vehicle according to any one of [Aspect 1] to [Aspect 3], wherein the support member is integrally molded.

[0014] According to the above-described configuration, since the components that make up the support member are integrally molded, the precision of the shape of the support member is improved, and therefore the guide portion can guide the support member to the mounting position with high precision. [Aspect 5] The vehicle front structure according to [Aspect 4], wherein the support member is made of fiber-reinforced resin.

[0015] According to the above configuration, by using a support member made of fiber reinforced resin, it is possible to reduce the weight of the support member while maintaining the strength of the support member. [Aspect 6] The crash box has a cylindrical portion extending in the fore-and-aft direction, and a connecting portion connected to the front end of the cylindrical portion and protruding toward the outer periphery of the cylindrical portion, and a storage recess is provided on the front end surface of the connecting portion to store the extending portion.This is a front structure of a vehicle described in [Aspect 5].

[0016] According to the above configuration, when the resin extension portion is positioned between the connecting portion at the front end of the crash box and the bumper reinforcement, the extension portion is accommodated in the accommodation recess. This reduces compressive stress acting on the extension portion sandwiched between the crash box and the bumper reinforcement. This suppresses creep deformation of the extension portion. This improves the durability of the support member.

[0017] [Aspect 7] A vehicle front structure according to [Aspect 5], wherein a housing recess for housing the extension portion is provided on a rear surface of the bumper reinforcement.

[0018] According to the above configuration, when the resin extension portion is positioned between the connecting portion at the front end of the crash box and the bumper reinforcement, the extension portion is accommodated in the accommodation recess. This reduces compressive stress acting on the extension portion sandwiched between the crash box and the bumper reinforcement. This suppresses creep deformation of the extension portion. This improves the durability of the support member. [Effects of the Invention]

[0019] According to the present invention, it becomes easier to assemble the crash box to a predetermined position on the bumper reinforcement. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is an exploded perspective view showing the front structure of a vehicle according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] FIG. 3 is a cross-sectional view showing a state in which the crash box is engaged with the inclined surface of the second guide portion. [Figure 4] FIG. 4 is an exploded perspective view showing the front structure of a vehicle according to the second embodiment. [Figure 5] FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. [Figure 6] FIG. 6 is a cross-sectional view showing a state in which the crash box is engaged with the inclined surface of the guide portion. [Figure 7] FIG. 7 is a perspective view showing a modified example of the support member. [Figure 8] FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] First Embodiment Hereinafter, a first embodiment of a vehicle front structure will be described with reference to FIGS. As shown in FIG. 1, the front structure of a vehicle includes a pair of front side members 10, a pair of crash boxes 20, a support member 30, and a bumper reinforcement 50.

[0022] In the following description, the longitudinal direction of the vehicle will be referred to as the longitudinal direction L, the width direction of the vehicle as the width direction W, and the vertical direction of the vehicle when the vehicle is positioned on a horizontal plane as the vertical direction Z. Furthermore, the front side and the rear side in the front-rear direction L will be simply referred to as the "front side" and the "rear side", respectively.

[0023] The vehicle of this embodiment has a symmetrical structure in the vehicle width direction W. Therefore, hereinafter, only the left half of the vehicle when viewed from the front to the rear will be described, and a description of the right half may be omitted.

[0024] <Front side member 10> As shown in FIG. 1, the pair of front side members 10 are cylindrical and extend in the front-rear direction L, and are disposed at an interval in the vehicle width direction W.

[0025] A vehicle body side flange portion 11 having a rectangular annular shape in a front view is provided at the front end of the front side member 10 and protruding radially outward from the front side member 10. Through holes 11a that penetrate the vehicle body side flange portion 11 in the front-rear direction L are provided at four corners of the vehicle body side flange portion 11.

[0026] <Crash Box 20> As shown in FIG. 1, the pair of crash boxes 20 are located in front of the front side members 10 and are attached to the front side members 10.

[0027] The crash box 20 has a cylindrical portion 21 extending in the front-rear direction L, a cylindrical portion side flange portion 22 connected to the rear end of the cylindrical portion 21, and a connecting portion 23 connected to the front end of the cylindrical portion 21.

[0028] The cylindrical portion-side flange portion 22 protrudes radially outward from the rear end of the cylindrical portion 21 and has a rectangular annular shape when viewed from behind. The cylindrical portion-side flange portion 22 is provided with through holes 22a at positions corresponding to the through holes 11a of the vehicle body-side flange portion 11, respectively.

[0029] The crash box 20 is attached to the front end of the front side member 10 by threading nuts 16 onto bolts 15 inserted through the through holes 22a and 11a. The connecting portion 23 protrudes from the outer periphery of the cylindrical portion 21 and has a rectangular plate shape when viewed from the front. The connecting portion 23 has a pair of long sides 24a and a pair of short sides 24b.

[0030] The front end of the cylindrical portion 21 is welded to the rear end surface of the connecting portion 23. The connecting portion 23 has a front end surface 24 that is the surface opposite to the rear end surface in the front-rear direction L. As shown in FIGS. 1 and 2, the front end surface 24 is provided with a flat portion 25 and an accommodating recess 26 that is recessed rearward relative to the flat portion 25.

[0031] As shown in FIG. 1, the flat portions 25 are provided along the pair of long sides 24a and the outer short sides 24b in the vehicle width direction W. The accommodation recess 26 is provided by cutting out the front end surface 24, and opens toward the inside in the vehicle width direction W and toward the front.

[0032] The bottom surface 26b of the accommodation recess 26 has a rectangular shape when viewed from the front. At four corners of a bottom surface 26b of the accommodation recess 26, through holes 26a are provided that penetrate the accommodation recess 26 in the front-rear direction L.

[0033] Two holes 27 are provided in the bottom surface 26b of the accommodation recess 26 at an interval in the vehicle width direction W. As shown in FIG. 2, the two holes 27 have a rectangular shape when viewed from the front, extend in the vertical direction Z, and have an inner peripheral edge 27a and an outer peripheral edge 27b spaced apart from each other in the vehicle width direction W.

[0034] The inner peripheral edge 27a is located radially inward of the outer peripheral surface of the cylindrical portion . The outer peripheral edge 27b is located outside the outer peripheral surface of the cylindrical portion 21 in the radial direction of the cylindrical portion 21.

[0035] The crash box 20 is made of metal. <Support member 30> As shown in FIGS. 1 and 2, the support member 30 is attached to the pair of crash boxes 20 to support the orientation of the pair of crash boxes 20.

[0036] The support member 30 is made of a fiber-reinforced resin, and the reinforcing fibers contained in the fiber-reinforced resin are, for example, glass fibers. As shown in FIG. 1, the support member 30 has a support member main body 31 located between a pair of crash boxes 20, and a pair of extension portions 35 extending outward from the support member main body 31 in the vehicle width direction W and located on both sides of the support member main body 31 in the vehicle width direction W.

[0037] In this embodiment, the support member main body 31 and the pair of extension portions 35 are integrally formed by injection molding. (Support member body 31) As shown in Figure 1, the support member main body 31 has an upper wall portion 32 extending in the vehicle width direction W, a pair of side wall portions 33 extending downward from both ends of the upper wall portion 32 in the vehicle width direction W, and a pair of inclined portions 34 extending from the lower ends of the pair of side wall portions 33 toward the central portion of the upper wall portion 32.

[0038] The upper wall portion 32 is provided with headlights and a hood lock for a bonnet hood (both not shown). The inclined portion 34 is inclined so that the more inwardly positioned the portion in the vehicle width direction W, the higher the position.

[0039] (Extension part 35) As shown in FIG. 1, the extension portion 35 has a first portion 36 extending forward from the lower end of the side wall portion 33, and a second portion 37 extending outward from the front end of the first portion 36 in the vehicle width direction W.

[0040] The first portion 36 is located more inward than the crash boxes 20 in the vehicle width direction W. The front end of the first portion 36 is arranged alongside the connecting portion 23 in the vehicle width direction W. As shown in Figure 2, the second part 37 has a plate-shaped base portion 38 extending from the front end of the first part 36 outward in the vehicle width direction W, and a first guide portion 40 and a second guide portion 45 protruding rearward from the base portion 38.

[0041] The base portion 38 is accommodated in the accommodation recess 26 of the connecting portion 23 . The outer edge of the base portion 38 extends along the inner edge of the receiving recess 26 of the connecting portion 23 (see FIG. 1).

[0042] The front surface of the base portion 38 is located on the same plane as the flat portion 25 of the front end surface 24 . The base portion 38 is provided with through holes 38a at positions corresponding to the through holes 26a.

[0043] (First guide portion 40 and second guide portion 45) As shown in FIG. 2, the first guide portion 40 and the second guide portion 45 are provided at positions corresponding to the holes 27.

[0044] The first guide portion 40 and the second guide portion 45 are arranged in order from the outside in the vehicle width direction W. The first guide portion 40 has a first wall portion 41 and a second wall portion 42 that face each other in the vehicle width direction W.

[0045] The first wall portion 41 protrudes rearward from the base portion 38 in the front-rear direction L. The rear surface of the first wall portion 41 abuts against the inner circumferential surface of the hole 27. The second wall portion 42 is located more inward than the first wall portion 41 in the vehicle width direction W, and protrudes from the base portion 38 toward the rear end of the first wall portion 41. The second wall portion 42 is inclined so that the more rearward the portion of the second wall portion 42 is located, the more outward in the vehicle width direction W. The rear surface of the second wall portion 42 is an inclined surface 42a that is inclined with respect to both the front-rear direction L and the vehicle width direction W, and abuts against the front end of the tubular portion 21.

[0046] The second guide portion 45 has a third wall portion 46 and a fourth wall portion 47 that face each other in the vehicle width direction W. The third wall portion 46 is inclined so that the more rearward the portion, the more outwardly it is positioned in the vehicle width direction W. The rear surface of the third wall portion 46 is an inclined surface 46a that is inclined with respect to both the front-rear direction L and the vehicle width direction W.

[0047] The fourth wall portion 47 is located outward of the third wall portion 46 in the vehicle width direction W, and protrudes from the base portion 38 toward the rear end of the third wall portion 46. The fourth wall portion 47 is inclined so that the more rearward the portion is located, the more inward in the vehicle width direction W. The rear surface of the fourth wall portion 47 is an inclined surface 47a that is inclined with respect to both the front-rear direction L and the vehicle width direction W, and abuts against the front end of the tubular portion 21.

[0048] <Bumper Reinforcement 50> As shown in FIGS. 1 and 2, the bumper reinforcement 50 is plate-shaped, extends in the vehicle width direction W, and is located in front of the pair of crash boxes 20.

[0049] The bumper reinforcement 50 has through holes 50a formed at positions corresponding to the through holes 38a of the base portion 38, respectively. The bumper reinforcement 50 is attached to the front ends of the pair of crash boxes 20 by threading nuts 18 onto bolts 17 inserted through the through holes 50a, 38a, 26a.

[0050] The bumper reinforcement 50 is made of metal. In this embodiment, the pair of front side members 10 correspond to the pair of vehicle body frames according to the present invention. Also, in this embodiment, the holes 27 correspond to the engaged portions according to the present invention.

[0051] <Operation of the First Embodiment> 3, when the second guide portion 45 engages with the front end of the crash box 20, the position of the crash box 20 is guided to the attachment position along the inclined surface 46a of the second guide portion 45. This reduces variation in the position of the front end of the crash box 20, i.e., the position of the portion of the crash box 20 where the bumper reinforcement 50 is attached.

[0052] <Effects of the first embodiment> (1-1) The extension portion 35 has inclined surfaces 42a, 46a that are inclined in both the longitudinal direction L and the vehicle width direction W, and has a first guide portion 40 and a second guide portion 45 that engage with the front end of the crash box 20 to guide the crash box 20 to the mounting position.

[0053] According to this configuration, the above-described effect is achieved, making it easier to assemble the crash boxes 20 at predetermined positions on the bumper reinforcement 50. Therefore, the bumper reinforcement 50 can be reliably attached to the crash boxes 20.

[0054] (1-2) Two holes 27 are provided at an interval in the vehicle width direction W on the front end surface 24 of the connecting portion 23. The first guide portion 40 and the second guide portion 45 are inserted into the two holes 27, respectively.

[0055] With this configuration, the first guide portion 40 and the second guide portion 45 are inserted into the two holes 27, and the crash box 20 is guided to the mounting position along the inclined surfaces 42a, 46a in the vehicle width direction W. Furthermore, the first guide portion 40 and the second guide portion 45 are engaged with the two holes 27, and this restricts the movement of the crash box 20 relative to the support member 30. This allows the crash box 20 to be fixed in the mounting position.

[0056] (1-3) The support member 30 is integrally molded. According to this configuration, the components that make up the support member 30 are integrally molded, which improves the accuracy of the shape of the support member 30. Therefore, the first guide portion 40 and the second guide portion 45 can guide the support member 30 to the attachment position with high accuracy.

[0057] (1-4) The support member 30 is made of fiber reinforced resin. According to this configuration, by using the support member 30 made of fiber reinforced resin, it is possible to reduce the weight of the support member 30 while maintaining the strength of the support member 30.

[0058] (1-5) The front end surface 24 of the connecting portion 23 is provided with an accommodating recess 26 for accommodating the extending portion 35. With this configuration, when the resin extension portion 35 is positioned between the connecting portion 23, which is the front end of the crash box 20, and the bumper reinforcement 50, the extension portion 35 is accommodated in the accommodation recess 26. This reduces the compressive stress acting on the extension portion 35 sandwiched between the crash box 20 and the bumper reinforcement 50. This suppresses creep deformation of the extension portion 35. This improves the durability of the support member 30.

[0059] Second Embodiment Next, a second embodiment of the vehicle front structure will be described with reference to FIGS. 4 to 6, focusing on the differences from the first embodiment.

[0060] In the following, for configurations of the second embodiment that are identical to or correspond to the configurations of the first embodiment, duplicate explanations may be omitted by adding a symbol that is the symbol "**" of the configurations of the first embodiment plus "50".

[0061] <Crash Box 70> 4, a connecting portion 73 having a rectangular ring shape in front view is connected to the front end of the cylindrical portion 71. The connecting portion 73 has a protruding portion 73a that protrudes radially outward from the cylindrical portion 71 and a cutout portion 73b that does not protrude radially outward from the cylindrical portion 71.

[0062] In this embodiment, the front end of the cylindrical portion 71 has a square shape in a front view. The front end of the cylindrical portion 71 extends in the vehicle width direction W and has an upper edge 71a and a lower edge 71b spaced apart from each other in the up-down direction Z, and a pair of side edges 71c connecting the ends of the upper edge 71a and the lower edge 71b in the vehicle width direction W.

[0063] The protruding portion 73a is connected to an upper edge 71a, a lower edge 71b, and an outer side edge 71c in the vehicle width direction W of the pair of side edges 71c of the cylindrical portion 71 at the front end. The cutout portion 73b is connected to the inner side edge 71c in the vehicle width direction W of the pair of side edges 71c.

[0064] At the four corners of the protruding portion 73a, through-holes 76 that penetrate the connecting portion 73 in the front-rear direction L are provided. <Support member 80> As shown in FIGS. 4 and 5, the second portion 87 of the extending portion 85 is provided with a plate-shaped base portion 88 and a guide portion 90 that protrudes rearward from the base portion 88.

[0065] As shown in FIG. 5, the guide portion 90 has a first wall portion 91, a second wall portion 92, an intermediate wall portion 95, a third wall portion 96, and a fourth wall portion 97. The first wall portion 91 and the fourth wall portion 97 are spaced apart in the vehicle width direction W and protrude rearward from the base portion 88 in the front-rear direction L.

[0066] The second wall portion 92 extends from the rear end of the first wall portion 91 toward the inside and forward in the vehicle width direction W. The second wall portion 92 is inclined so that the more inside the portion is positioned in the vehicle width direction W, the more forward it is positioned.

[0067] The rear surface of the second wall portion 92 is an inclined surface 92a that is inclined both in the front-rear direction L and the vehicle width direction W, and abuts against the cutout portion 73b from the inner peripheral side of the cylindrical portion 71. The third wall portion 96 extends from the rear end of the fourth wall portion 97 toward the outside and forward in the vehicle width direction W. The third wall portion 96 is inclined so that the portions of the third wall portion 96 that are located further outward in the vehicle width direction W are positioned further forward. The rear surface of the third wall portion 96 is an inclined surface 96a that is inclined with respect to both the front-to-rear direction L and the vehicle width direction W, and abuts against the cutout portion 73b from the outer circumferential side of the cylindrical portion 71. In other words, the guide portion 90 sandwiches the cutout portion 73b from the inner circumferential side and the outer circumferential side of the cylindrical portion 71 between the inclined surface 92a and the inclined surface 96a.

[0068] The intermediate wall portion 95 connects the front end of the second wall portion 92 and the front end of the third wall portion 96, and extends in the vehicle width direction W. The intermediate wall portion 95 has an opposing surface 95a that faces the front end of the cutout portion 73b.

[0069] <Bumper Reinforcement 100> 4, the bumper reinforcement 100 has a plate-shaped main body portion 101 extending in the vehicle width direction W, and an upper mounting portion 110 and a lower mounting portion 112 connected to the main body portion 101. The main body portion 101 has a front wall portion 104 extending in the up-down direction Z, an upper wall portion 105 extending rearward from an upper end of the front wall portion 104, and a lower wall portion 106 extending rearward from a lower end of the front wall portion 104. On a rear surface 102 of the main body portion 101, a housing recess 107 having a U-shaped cross section is formed by the front wall portion 104, the upper wall portion 105, and the lower wall portion 106.

[0070] 5, the second portion 87 of the extending portion 85 is housed inside the housing recess 107. In this embodiment, the front wall portion 104 and the second portion 87 are spaced apart from each other in the front-rear direction L.

[0071] As shown in FIG. 4, the upper mounting portion 110 extends upward from the rear end of the upper wall portion 105. The lower mounting portion 112 extends downward from the rear end of the lower wall portion 106 .

[0072] The upper and lower mounting portions 110 and 112 are provided with through holes 111 and 113, respectively, at positions corresponding to the through hole 76 of the connecting portion 73. The bumper reinforcement 100 is attached to the front ends of the pair of crash boxes 70 by threading nuts 68 onto bolts 67 inserted through the through holes 76, 111 and the through holes 76, 113, respectively.

[0073] (Operation and effect of the second embodiment) According to this embodiment, in addition to the effects (1-1), (1-3), and (1-4) of the first embodiment, the following effects can be achieved.

[0074] (2-1) The guide portion 90 has a pair of inclined surfaces 92a, 96a that sandwich the cutout portion 73b from the inner and outer circumferential sides of the cylindrical portion 71 in the vehicle width direction W, and an opposing surface 95a that faces the front end of the cutout portion 73b.

[0075] With this configuration, as shown in Fig. 6, by engaging the guide portion 90 with the cutout portion 73b of the connecting portion 73, the crash box 70 is guided along the inclined surface 92a in the vehicle width direction W to the mounting position. Furthermore, as shown in Fig. 5, the cutout portion 73b is surrounded by the pair of inclined surfaces 92a, 96a and the opposing surface 95a, which restricts relative movement of the crash box 70 with respect to the support member 80. This allows the crash box 70 to be fixed in the mounting position.

[0076] (2-2) The rear surface 102 of the bumper reinforcement 100 is provided with an accommodating recess 107 for accommodating the extension portion 85 . With this configuration, when the resin extending portion 85 is positioned between the connecting portion 73, which is the front end of the crash box 70, and the bumper reinforcement 100, the extending portion 85 is accommodated in the accommodating recess 107. This reduces the compressive stress acting on the extending portion 85 sandwiched between the crash box 70 and the bumper reinforcement 100. This suppresses creep deformation of the extending portion 85. This improves the durability of the support member 80.

[0077] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0078] In the first embodiment, the front surface of the base portion 38 of the extension portion 35 and the flat portion 25 of the front end surface 24 of the connecting portion 23 are positioned on the same plane, but the front surface of the base portion 38 may be positioned rearward of the flat portion 25.

[0079] In the first embodiment, the accommodating recess 26 is provided in the front end surface 24 of the connecting portion 23, and in the second embodiment, the accommodating recess 107 is provided in the rear surface 102 of the bumper reinforcement 100, but this is not limiting. If creep deformation of the extension portion 35, 85 caused by sandwiching between the front end of the crash box 20, 70 and the bumper reinforcement 50, 100 is small, the accommodating recess 26, 107 may be omitted.

[0080] The support members 30 and 80 may be made of metal. In the above embodiments, the support members 30, 80 are integrally formed, but the support member main body and the extension portion may be formed separately and attached to each other.

[0081] In the first embodiment described above, the two holes 27 into which the first guide portion 40 and the second guide portion 45 are inserted are defined as the engaged portions, but the engaged portions may also be the two holes into which the first guide portion 40 and the second guide portion 45 are inserted.

[0082] In the first embodiment, the first guide portion 40 and the second guide portion 45 are inserted into the hole 27, and in the second embodiment, the inclined surfaces 92a, 96a of the guide portion 90 sandwich the cutout portion 73b. However, this is not limited to this. As shown in FIGS. 7 and 8 , a pair of extending portions 235 of the support member 230 may each be provided with a through hole 228 extending in the front-rear direction L and through which the cylindrical portion 221 of the crash box 220 is inserted. As shown in FIG. 7 , the through hole 228 has a rectangular cross section and includes a bottom surface 241 extending along both the front-rear direction L and the vehicle width direction W, a top surface 242 opposing the bottom surface 241 in the up-down direction Z, and a pair of side surfaces 243 located on both sides of the vehicle width direction W and connecting the bottom surface 241 and the top surface 242. The bottom surface 241 and the top surface 242 are parallel to each other and sandwich the cylindrical portion 221 in the up-down direction Z. As shown in Fig. 8, the pair of side surfaces 243 are inclined so as to move away from each other in the vehicle width direction W toward the rear (upward in Fig. 8). The leading ends of the crash boxes 220, indicated by the two-dot chain lines in Fig. 8, engage with the inclined surfaces of the side surfaces 243, thereby guiding the crash boxes 220 to the mounting positions indicated by the solid lines in Fig. 8. Even in this case, the same effect as effect (1-1) above can be achieved.

[0083] In the above embodiments, the inclined surfaces 42a, 46a, 47a, 92a, 96a are inclined in both the front-rear direction L and the vehicle width direction W, but this is not limiting. For example, the guide portion may have an inclined surface that is inclined in both the front-rear direction L and the up-down direction Z. In this case, the crash box is guided to the mounting position along the inclined surface of the guide portion in the up-down direction Z.

[0084] In the above embodiments, the pair of body frames to which the crash boxes 20, 70 are attached are embodied as front side members. However, the pair of body frames may also be, for example, suspension members. [Explanation of symbols]

[0085] 10...Front side member (body frame) 11...Vehicle body flange 11a...Through hole 15...volts 16...Nut 17.67…volts 18,68...Nut 20, 70, 220…Crash box 21, 71, 221...Cylindrical part 22...Cylindrical portion side flange portion 22a...Through hole 23,73...Connection part 24…Front end surface 24a...long side 24b...short side 25...Flat area 26... Storage recess 26a...Through hole 26b…Bottom surface 27...hole (engaged part) 27a...inner edge 27b...Outer edge 30, 80, 230...Support member 31...Support member body 32...Top wall part 33...Side wall 34…Slope part 35,85,235...extension part 36...Part 1 37,87…Second part 38,88...Base 38a...Through hole 40…1st information section 41...First wall part 42…Second wall part 42a...Slope surface 45…Second information section 46...Third wall section 46a…Slope surface 47…4th wall part 47a…Slanted surface 50,100…Bumper reinforcement 50a...Through hole 71a...upper edge 71b…lower edge 71c…Side edge 73a...Protruding part 73b...missing part 76...Through hole 90…Information department 91…First wall part 92…Second wall part 92a…Slope surface 95...Intermediate wall 95a...Opposing surface 96...Third wall part 96a…Slope surface 97…4th wall section 101...Main body 102…Rear side 104...Front wall part 105...Top wall part 106…Lower wall part 107... Storage recess 110...Upper mounting part 111...Through hole 112...Lower mounting part 113...Through hole 228...Through hole 241...Bottom 242…Top surface 243...Side

Claims

1. a pair of body frames arranged at an interval in the vehicle width direction; a pair of crash boxes located in front of the body frame in the front-rear direction of the vehicle and attached to the body frame; a support member including a support member main body located between the pair of crash boxes, and a pair of extension portions extending outward from the support member main body in the vehicle width direction and positioned on both sides of the support member main body in the vehicle width direction; a bumper reinforcement extending in the vehicle width direction and attached to front ends of the pair of crash boxes, The extension portion has an inclined surface inclined with respect to the front-rear direction, and has a guide portion that engages with a front end of the crash box to guide the crash box to an installation position. Front structure of the vehicle.

2. The crash box has a cylindrical portion extending in the front-rear direction, and a connecting portion connected to a front end of the cylindrical portion and protruding toward an outer periphery of the cylindrical portion, two hole-shaped or aperture-shaped engaged portions are provided at a front end surface of the connecting portion and spaced apart in the vehicle width direction, The two guide portions are inserted into the two engaged portions. The front structure of a vehicle according to claim 1.

3. The crash box has a cylindrical portion extending in the front-rear direction and a connecting portion connected to a front end of the cylindrical portion, the connecting portion has a missing portion that does not protrude radially outward from the cylindrical portion, The guide portion has a pair of inclined surfaces that sandwich the cutout portion from the inner peripheral side and the outer peripheral side of the cylindrical portion in the vehicle width direction, respectively, and an opposing surface that faces a front end of the cutout portion. The front structure of a vehicle according to claim 1.

4. The support member is integrally formed. The front structure of a vehicle according to any one of claims 1 to 3.

5. The support member is made of fiber reinforced resin. The front structure of a vehicle according to claim 4.

6. The crash box has a cylindrical portion extending in the front-rear direction, and a connecting portion connected to a front end of the cylindrical portion and protruding toward an outer periphery of the cylindrical portion, A front end surface of the connecting portion is provided with an accommodating recess for accommodating the extending portion. The front structure of a vehicle according to claim 5.

7. A housing recess for housing the extension portion is provided on a rear surface of the bumper reinforcement. The front structure of a vehicle according to claim 5.

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