Crash Box

Abstract

To enable a crash box to which a fastening hook can be attached, and is able to secure the support strength of the fastening hook even with the crash box jointed by spot welding by reinforcing a part to support the fastening hook with a reinforcement member, thereby preventing an increase in weight and manufacturing cost.SOLUTION: This crash box comprises: a cylindrical body 11, formed into a cylindrical shape so as to form inside a hollow part to absorb an impact energy on receiving an impact load inputted in a penetration direction of the hollow part; a tabular lid body 13 jointed with the cylindrical body 11 by spot welding by being covered on the end part of the cylindrical body 11 so as to close the hollow part; a fastening bracket 15 which makes the fastening hook 18 project to support the same, is disposed overlapping the lid body 13, and is coupled to the lid body 13 by being covered on the end part of the cylindrical body 11 so as to close the hollow part with the lid body 13; and a long caulking pin 12 disposed along the fastening bracket 15 in the cylindrical body 11 so as to transverse the penetration direction of the hollow part of the cylindrical body 11, and coupled to the cylindrical body 11 at both ends.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a crash box to which a lashing hook can be attached.

Background Art

[0002] The bumpers at the front and rear of the vehicle body are respectively connected to the side members on the left, right, front, and rear of the vehicle body via crash boxes. A lashing hook used when towing or lashing the vehicle, if necessary, is attached to the front side or the rear side of the crash box. The lashing hook is attached so as to penetrate the bumper and protrude forward or backward of the vehicle. By connecting a rope or wire to the lashing hook, it is possible to tow the own vehicle or another vehicle and to lash the own vehicle body inside a transport ship. Patent Document 1 discloses a crash box to which a lashing hook can be attached.

[0003] A crash box to which a lashing hook can be attached is formed by joining steel plates in a box shape. The joining of the steel plates is preferably performed by spot welding for ease of manufacture. However, depending on the shape of the crash box, there are restrictions on securing the required number of spot welds. Therefore, in some cases, it is formed by joining with arc welding in order to ensure the support strength of the lashing hook.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, arc welding has a problem that it is difficult to reduce the plate thickness of the steel plate at the welded portion compared to the case of joining by spot welding, and the manufacturing cost and weight of the crash box increase.

[0006] The object of the present invention is, in a crash box to which a lashing hook can be attached, to reinforce the portion supporting the lashing hook with a reinforcing member, thereby ensuring the supporting strength of the lashing hook even in a crash box joined by spot welding, and suppressing an increase in manufacturing cost and weight.

Means for Solving the Problem

[0007] The crash box of the first invention of the present invention is formed in a cylindrical shape so as to form a hollow portion inside, and a cylindrical body that is crushed by receiving a collision load input in the penetrating direction of the hollow portion to absorb collision energy, and a plate-shaped lid that is placed on the end portion of the cylindrical body so as to close the hollow portion and is joined to the cylindrical body by spot welding. A lashing bracket that projects and supports a lashing hook used when connecting the vehicle body to another object, is disposed on top of the lid, and is placed on the end portion of the cylindrical body so as to close the hollow portion together with the lid and is joined to the lid, and a reinforcing member that is disposed along the lashing bracket inside the cylindrical body so as to cross the penetrating direction of the hollow portion of the cylindrical body and both ends of which are joined to the cylindrical body.

[0008] The second invention of the present invention is, in the first invention, wherein the lid includes a flange portion that extends along the surface of the plate forming the cylindrical body at an end portion that abuts against the cylindrical body, and both ends of the reinforcing member are joined to the flange portion of the lid and the cylindrical body.

[0009] The third invention of the present invention is, in the first invention, wherein the lashing bracket includes a flange portion that extends along the surface of the plate forming the cylindrical body at an end portion that abuts against the cylindrical body, both ends of the reinforcing member penetrate through the flange portion of the lashing bracket and are joined to the cylindrical body, and the through hole of the flange portion of the lashing bracket is sized to substantially restrict the movement of the reinforcing member inserted through the through hole in a direction orthogonal to the insertion direction.

[0010] The fourth invention of the present invention is, in the first invention described above, wherein the lid body and the fastening bracket each include a flange portion extending along the surface of the plate forming the cylindrical body at the end portion in contact with the cylindrical body, and the flange portions of the lid body and the fastening bracket are arranged with the end portion of the cylindrical body sandwiched therebetween in the respective plate thickness directions, and both end portions of the reinforcing member penetrate through the flange portion of the fastening bracket and are coupled to the flange portions of the cylindrical body and the lid body.

[0011] The fifth invention of the present invention is, in any one of the first to fourth inventions described above, wherein the cylindrical body is composed of a pair of half bodies, and the dividing direction of the half bodies is made to coincide with the direction in which the reinforcing member extends toward both of its own end portions.

Effect of the Invention

[0012] According to the present invention, the portion of the cylindrical body where the fastening bracket is coupled is reinforced by the reinforcing member against deformation by the fastening hook. Therefore, even in a crash box joined by spot welding, the support strength of the fastening hook can be ensured. As a result, the crash box can reduce the thickness of the steel plate constituting the cylindrical body compared to the case of forming by joining with arc welding, and can suppress an increase in manufacturing cost and weight.

Brief Description of the Drawings

[0013]

Figure 1

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Figure 11

Embodiments for Carrying Out the Invention

[0014] <Overall Configuration of One Embodiment> FIG. 1 shows a state in which the crash boxes 10 of one embodiment of the present invention are respectively coupled to the left and right ends of the bumper reinforcement 21 in front of the vehicle. Further, FIG. 2 shows a state in which the tie-down hooks 18 are attached so as to protrude forward and backward of the vehicle from the crash boxes 10 arranged in the front and rear of the vehicle 20. In each figure, the directions when the forward direction of the vehicle 20 is defined as "front" by the intersecting arrows are shown. Hereinafter, the description regarding directions will be made based on this direction.

[0015] In this case, a total of four crash boxes 10 are provided in a dispersed manner on the front, rear, left, and right of the vehicle, and each crash box 10 is coupled between the bumper reinforcements 21 in the front and rear of the vehicle and the side members (not shown) in the front, rear, left, and right of the vehicle body. As is well known, each crash box 10 is entirely made of a steel plate, and has a function of being crushed by receiving a collision load applied from the front or rear of the vehicle via the bumper 22 and absorbing the collision energy. Tie-down nuts 19 for fastening and fixing the tie-down hooks 18 are provided in front of the crash box 10 in front of the vehicle and behind the crash box 10 in the rear of the vehicle.

[0016] Bumpers 22 arranged in front of and behind the fastening nut 19 are provided with through holes (not shown), and the fastening hook 18 can be fastened and fixed to the fastening nut 19 through the through holes as required. The fastening hook 18 is used to couple a towing wire or rope when towing one vehicle with another by connecting the vehicles with a towing wire or rope. Further, the fastening hook 18 is used to couple a fastening wire or rope when fastening the vehicle 20 to the floor in a transport ship. In FIG. 2, the dashed lines drawn in front of and behind the vehicle indicate the towing wire or rope coupled to the fastening hook 18. Also, in FIG. 2, the solid lines drawn between the vehicle and the floor in front of and behind the vehicle indicate the fastening wire or rope coupled to the fastening hook 18. When a towing wire or rope is connected to the fastening hook 18 and the vehicle 20 is towed by another vehicle or towed by another vehicle, and when a fastening wire or rope is connected to the fastening hook 18 and the vehicle 20 is fastened, a relatively large force sufficient to support the vehicle weight is applied to the crash box 10 via the fastening hook 18.

[0017] Hereinafter, the configuration of the crash box 10 alone will be described with reference to FIGS. 3 to 11. Here, the crash box 10 arranged in the left front in FIG. 1 will be described. The crash box 10 arranged in the right front in FIG. 1 is configured to be line-symmetrical with the crash box 10 arranged in the left front. Further, the crash box 10 arranged on the right side at the rear of the vehicle is configured to be point-symmetrical with the crash box 10 arranged in the left front, and the crash box 10 arranged on the left side at the rear of the vehicle is configured to be point-symmetrical with the crash box 10 arranged in the right front.

[0018] <Configuration of the cylindrical body 11 and the lid body 13 of the crash box 10> As shown in FIGS. 4 to 8, the cylindrical body 11 is composed of two upper and lower half bodies 11U and 11D. As shown in FIG. 5, by stacking and combining the upper and lower half bodies 11U and 11D vertically, a substantially rectangular cylindrical body 11 is formed. The shape of the cylindrical body 11 itself is known, and the cylindrical body 11 may not be composed of two upper and lower half bodies 11U and 11D, but may be formed by bending a single plate into a cylindrical shape.

[0019] The upper and lower half bodies 11U and 11D are each provided with flange portions 11a and 11b that extend in opposite directions from each other in the left - right direction at portions that come into contact with each other when combined vertically. On the planes of the respective flange portions 11a and 11b, a plurality (two in this case) of through - holes 11c and 11e that are spaced apart from each other in the front - rear direction are respectively bored. By inserting short caulking pins 17 into the respective through - holes 11c and 11e and performing caulking from the vertical direction, the upper and lower half bodies 11U and 11D are joined as shown in FIGS. 9 and 11 to form a single cylindrical body 11.

[0020] As shown in FIGS. 4 and 7, plate - like upper cover bodies 13U and lower cover bodies 13D that are long in the left - right direction are joined to the front end portions of the upper half body 11U and the lower half body 11D by spot welding respectively. The spot - welded portions are indicated by cross marks in each figure. The same applies to other spot - welded portions. As shown in FIG. 4, when the upper half body 11U and the lower half body 11D are combined as the cylindrical body 11, the upper cover body 13U and the lower cover body 13D are covered over the front end portion of the cylindrical body 11 so as to close the hollow portion inside the cylindrical body 11. The upper cover body 13U and the lower cover body 13D are each formed with a plurality (four in this case) of flange portions 13a - 13c, 13e - 13g that extend individually along the surface of the plate of the cylindrical body 11. Among them, three of the flange portions 13a - 13b, 13e - 13f each extend along the outer wall surface of the cylindrical body 11, and the remaining one flange portion 13c, 13g each extends along the inner wall surface of the cylindrical body 11.

[0021] Among each three flange portions 13a to 13b and 13e to 13f extending along the outer wall surface of the cylindrical body 11, the flange portions 13a and 13e located on the left and right sides are caulked and joined to the upper and lower end portions of a long caulking pin 12 described later together with the front end portions of the upper half body 11U and the lower half body 11D. Therefore, through holes 13n penetrating in the vertical direction are formed in the flange portions 13a and 13e (the through hole of the flange portion 13e is not shown). Further, among each three flange portions 13a to 13b and 13e to 13f, the central flange portions 13b and 13f sandwiched between the left and right flange portions 13a and 13e are joined to the front end portions of the upper half body 11U and the lower half body 11D by spot welding. Furthermore, among the flange portions 13c and 13g extending along the inner wall surface of the cylindrical body 11, the flange portion 13c is joined to the front end portion of the upper half body 11U by spot welding, and the flange portion 13g is in a state of abutting against the inner wall surface of the front end portion of the lower half body 11D.

[0022] The upper lid body 13U and the lower lid body 13D are provided with extension portions 13h and 13i at the right end portions, and the extension portions 13h and 13i extend and project outside the hollow portion beyond the range where the upper lid body 13U and the lower lid body 13D cover the hollow portion of the cylindrical body 11. Through holes 13j and 13k penetrating in the front-rear direction are formed in the tip portions of the extension portions 13h and 13i, and weld nuts 13m are welded and joined to the rear side surfaces of the extension portions 13h and 13i as shown in FIG. 6 corresponding to the respective through holes 13j and 13k.

[0023] As shown in FIGS. 6 and 7, a generally rectangular plate-shaped fastening bracket 15 is joined to the rear side surface of the lower lid body 13D by spot welding. The spot welding is performed at two locations marked with an "X" above the flange portions 13e and 13f on the surface of the plate of the lower lid body 13D (see FIG. 7). Further, through holes 13o and 13p penetrating in the front-rear direction are formed at the left end portions of the upper lid body 13U and the lower lid body 13D, respectively. Corresponding to these through holes 13o and 13p, similar through holes 15d are formed in the fastening bracket 15, respectively (see FIG. 7). Furthermore, on the rear side surface of the fastening bracket 15, weld nuts 15b are welded and joined as shown in FIG. 6 corresponding to the through holes 15d. These weld nuts 13m and 15b are used for bolt fastening when coupling the crash box 10 to the bumper reinforcement 21.

[0024] <Configuration of the fastening bracket 15 of the crash box 10> As shown in FIGS. 6 to 8, the generally rectangular plate-shaped fastening bracket 15 is arranged to cover the front end portion of the cylindrical body 11 by the surface of the plate, and has a shape and size that generally cover the hollow portion of the cylindrical body 11. The upper and lower ends of the fastening bracket 15 are bent rearward to form flange portions 15a, respectively. The upper surface of the upper flange portion 15a and the lower surface of the lower flange portion 15a are respectively in contact with the upper and lower inner wall surfaces of the front end portion of the cylindrical body 11. Through holes 15c penetrating in the vertical direction are formed at the left and right end portions of the upper and lower flange portions 15a, respectively. As described above, long caulking pins 12, which are round bars, are inserted vertically through the through holes 15c. The long caulking pins 12 correspond to the reinforcing members in the "Means for Solving the Problems". The through holes 15c have the minimum inner diameter through which the long caulking pins 12 can be inserted, and have an inner diameter that prevents the long caulking pins 12 from moving in a direction orthogonal to the insertion direction.

[0025] A through-hole 15d penetrating in the front-rear direction is formed in a portion of the surface of the plate of the fixing bracket 15 that is shifted slightly to the lower right from the center of the surface. A fixing nut 19 having a generally cylindrical shape is inserted into the through-hole 15d from the rear side to the front side of the fixing bracket 15. An annular flange portion 19a is integrally formed on the outer peripheral surface of the fixing nut 19 over the entire circumference, and the annular front end surface of the flange portion 19a is joined by arc welding in a state of abutting against the rear surface of the fixing bracket 15. A female thread 19b is formed on the inner peripheral surface of the rear end side of the fixing nut 19. By screwing a male thread 18a formed at the tip of the fixing hook 18 into the female thread 19b, the fixing hook 18 can be fastened and fixed to the fixing nut 19. The upper lid body 13U and the lower lid body 13D disposed on the front surface of the fixing bracket 15 are formed with notches 13q and 13r so as to avoid interference with the outer peripheral surface of the fixing nut 19. The fixing bracket 15 has a thicker plate thickness than the cylindrical body 11 and the lid body 13 so as to withstand the force from the fixing hook 18. Since the cylindrical body 11 has a thinner plate thickness so as to be crushed by receiving a collision load, the plate thickness is made thinner in the order of the fixing bracket 15, the lid body 13, and the cylindrical body 11.

[0026] <Configuration of Reinforcement Member of Crash Box 10> As shown in FIGS. 6 to 8 and 10, the reinforcement member is composed of two long caulking pins 12. Each long caulking pin 12 is a round bar having a thickness that can be just inserted into the through-hole 15c of the fixing bracket 15, and has a stepped shape in which the thickness at the upper and lower tip portions is made one step thinner than the central portion in the vertical direction. The thickness of the tip portion with a small diameter of each long caulking pin 12 is such that it can be just inserted into each through-hole 13n of the flange portions 13a and 13e of the upper lid body 13U and the lower lid body 13D, and each through-hole 11f at the front end portion of the cylindrical body 11 overlapped with the flange portions 13a and 13e in the plate thickness direction. Each through-hole 11f is formed corresponding to each through-hole 13n.

[0027] With each long caulking pin 12 inserted through each through-hole 15c, each through-hole 13n, and each through-hole 11f, the end faces at the upper and lower ends of each long caulking pin 12 are caulked axially with a caulking tool, so that caulking marks 12a are formed on the end faces at the upper and lower ends of each long caulking pin 12 as shown by the dashed lines in Fig. 10. As a result, the outer diameter of the tip of each long caulking pin 12 increases by the volume of the caulking mark 12a, and the flange portions 13a, 13e of the upper lid body 13U and the lower lid body 13D, and the front end portion of the cylindrical body 11 are joined to the upper and lower ends of each long caulking pin 12.

[0028] <Configuration of the shape-retaining plate 16 of the crash box 10> As shown in Figs. 5 to 8, the shape-retaining plate 16 is a long plate material as a whole, and the front and back surfaces of the plate are sandwiched between the flange portions 11a, 11b of the upper half body 11U and the lower half body 11D in the vertical direction at the rear end. Through-holes 16a penetrating in the vertical direction are formed at both left and right ends of the shape-retaining plate 16. The shape-retaining plate 16 is caulked and joined between the flange portions 11a, 11b by inserting short caulking pins 17 that are commonly inserted through the through-holes 16a at both left and right ends into the flange portions 11a, 11b of the upper half body 11U and the lower half body 11D and caulking them. Further, the front end portion of the shape-retaining plate 16 is curved upward to form a rib 16b. Therefore, the shape-retaining plate 16 has enhanced bending deformation strength in the longitudinal direction. Accordingly, the shape-retaining plate 16 suppresses the deformation of the rear portion of the cylindrical body 11 in the left-right direction.

[0029] <Configuration of the mounting bracket 14 of the crash box 10> As shown in FIGS. 4 to 8, an attachment bracket 14 composed of an upper bracket 14U and a lower bracket 14D is coupled to the rear end portion of the cylindrical body 11. The upper bracket 14U is disposed along the upper surface of the upper half body 11U that forms the cylindrical body 11. Further, the lower bracket 14D is disposed along the lower surface of the lower half body 11D. The upper bracket 14U and the lower bracket 14D are shaped along the surface shapes of the upper half body 11U and the lower half body 11D, and flange portions 14a are respectively formed at the end portions on the surface sides of the upper half body 11U and the lower half body 11D of the upper bracket 14U and the lower bracket 14D. Each flange portion 14a is formed by being bent forward along the respective surfaces of the upper half body 11U and the lower half body 11D. Each flange portion 14a is joined to the respective surfaces of the upper half body 11U and the lower half body 11D by spot welding. The spot welding is performed at three locations each on the flange portions 14a of the upper bracket 14U and the lower bracket 14D as indicated by the cross marks.

[0030] The upper bracket 14U and the lower bracket 14D are used to fasten and couple the crash box 10 to the side frame of the vehicle body (not shown) with bolts and nuts. Therefore, the shapes of the rear side surfaces of the upper bracket 14U and the lower bracket 14D and the shape of the rear end portion of the cylindrical body 11 are shaped to match the shape of the coupling surface of the side frame. Further, through holes 14b penetrating in the front-rear direction are respectively formed at the right end portions of the upper bracket 14U and the lower bracket 14D, and fastening bolts can be inserted therethrough. Flange portions 14a are formed by extending around the through holes 14b, and the flange portions 14a of that portion function as ribs, enhancing the bending strength of the upper bracket 14U and the lower bracket 14D.

[0031] <Operational Effects of an Embodiment> In the crash box 10 of the above-described embodiment, two long caulking pins 12 are arranged and joined in parallel to the surface of the fixing bracket 15 at the front side portion of the cylindrical body 11 where the fixing bracket 15 is joined. Moreover, the flange portion 15a of the fixing bracket 15 is penetrated by the long caulking pin 12. Therefore, among the forces applied to the fixing hook 18, the component of the force in the direction along the surface of the plate of the cylindrical body 11 is transmitted to the long caulking pin 12 engaged with the through hole 15c of the fixing bracket 15. As a result, the force transmitted to the fixing bracket 15 via the fixing hook 18 is also transmitted to the long caulking pin 12, and deformation of the fixing bracket 15 and the cylindrical body 11 is suppressed.

[0032] Further, the long caulking pin 12 forms a closed cross-sectional structure together with the fixing bracket 15 and the lid body 13 that is joined in surface contact with the fixing bracket 15. Therefore, the force transmitted through the fixing hook 18 and deforming the cylindrical body 11 is supported by the closed cross-sectional structure. As a result, the support strength of the fixing hook 18 can be increased as compared with the case where there is no long caulking pin 12. That is, even in the crash box 10 joined by spot welding, the support strength of the fixing hook 18 can be ensured. Therefore, the crash box 10 can reduce the thickness of the steel plate constituting the cylindrical body 11 as compared with the case of forming by joining with arc welding, and can suppress an increase in manufacturing cost and weight.

[0033] The end portion of the cylindrical body 11 close to the fixing bracket 15 is sandwiched by the flange portions 13a to 13b, 13e to 13f of the upper lid body 13U and the lower lid body 13D, and the upper and lower flange portions 15a of the fixing bracket 15. Thereby, the end portion of the cylindrical body 11 close to the fixing bracket 15 has its deformation strength reinforced. Therefore, the thickness of the plate of the cylindrical body 11 can be reduced, and the crash box 10 can be lightened.

[0034] The dividing direction of the upper half body 11U and the lower half body 11D that form the cylinder body 11 is made to coincide with the direction extending toward both ends of the long caulking pin 12. Therefore, when the upper half body 11U and the lower half body 11D are stacked and joined in the vertical direction to form the cylinder body 11, the long caulking pin 12 is simultaneously inserted into the through hole 15c of the binding bracket 15, and further, the upper and lower ends of the long caulking pin 12 can be inserted into the through holes 13n of the front end portions of the upper half body 11U and the lower half body 11D, and the flange portions 13a - 13b, 13e - 13f of the upper lid body 13U and the lower lid body 13D. Therefore, the productivity of the crash box 10 can be increased.

[0035] The lid body 13 is divided into an upper lid body 13U and a lower lid body 13D. Therefore, the upper lid body 13U and the lower lid body 13D can be joined by spot welding separately on the upper and lower sides with respect to the upper half body 11U and the lower half body 11D before they are joined to each other. Moreover, the binding bracket 15 can be joined to the lower lid body 13D (it may also be the upper lid body 13U) and integrated, and then integrated with the lower half body 11D before joining. In this way, by joining the lid body 13 and the binding bracket 15 in a state of being divided vertically with respect to the upper half body 11U and the lower half body 11D, and then joining the upper half body 11U and the lower half body 11D to form the cylinder body 11, the crash box 10 provided with the lid body 13 and the binding bracket 15 can be configured all at once.

[0036] <Other Embodiments> As described above, specific embodiments have been explained, but the present invention is not limited to their appearance and configuration, and various changes, additions, and deletions are possible. For example, in the above embodiment, the reinforcing member is constituted by the long caulking pin 12, but it can also be constituted by a plate - like member similar to the shape - retaining plate 16.

[0037] <The Operational Effects of the Above - Described Embodiments Corresponding to Each Invention> Finally, the operational effects of the above - described embodiments corresponding to each invention after the second invention in the above - mentioned "Means for Solving the Problems" are appended.

[0038] According to the second invention, the flange portion of the lid body and the cylindrical body extending along the surface of the plate forming the cylindrical body are coupled to both ends of the reinforcing member. Therefore, the reinforcing member forms a closed cross-sectional structure together with the lid body and the fastening bracket. Accordingly, the force transmitted through the fastening hook and deforming the cylindrical body is supported by the closed cross-sectional structure. As a result, the supporting strength of the fastening hook can be increased as compared with the case where there is no reinforcing member.

[0039] According to the third invention, the flange portion of the fastening bracket is penetrated by the reinforcing member. Therefore, among the forces applied to the fastening hook, the component of the force in the direction along the surface of the plate forming the cylindrical body is transmitted to the reinforcing member engaged with the through hole of the fastening bracket. Therefore, the fastening bracket is supported by the reinforcing member, and the supporting strength of the fastening hook can be enhanced.

[0040] According to the fourth invention, by sandwiching the end portion of the cylindrical body close to the fastening bracket between both flange portions of the lid body and the fastening bracket, the end portion of the cylindrical body close to the fastening bracket can be reinforced.

[0041] According to the fifth invention, the cylindrical body made into a half body can be assembled together with the reinforcing member in the same process. Therefore, the productivity of the crash box can be increased.

Explanation of Reference Numerals

[0042] 10 Crash box 11 Cylindrical body 11U Upper half body 11D Lower half body 11a, 11b Flange portion 11c, 11e, 11f Through hole 12 Long caulking pin (reinforcing member) 12a Caulking mark 13 Lid body 13U Upper lid body 13D Lower lid body 13a, 13b, 13c, 13e, 13f, 13g Flange portion 13h, 13i Extension portion Through-holes 13j, 13k, 13n, 13o, 13p Weld nut 13m Notches 13q, 13r Mounting bracket 14 Upper bracket 14U Lower bracket 14D Flange portion 14a Through-hole 14b Binding bracket 15 Flange portion 15a Weld nut 15b Through-holes 15c, 15d Shape retention plate 16 Through-hole 16a Rib 16b Short caulking pin 17 Binding hook 18 Male thread 18a Binding nut 19 Flange portion 19a Female thread 19b Vehicle 20 Bumper reinforcement 21 Bumper 22

Claims

1. a cylindrical body formed in a cylindrical shape to form a hollow portion therein, and crushed by a collision load input in a direction through the hollow portion to absorb collision energy; a plate-shaped lid body that covers an end of the cylindrical body so as to close the hollow portion and is joined to the cylindrical body by spot welding; a fastening bracket that supports a fastening hook used when fastening a vehicle body to another object by protruding the fastening bracket, is disposed on top of the lid body, and is fitted over an end of the cylindrical body and connected to the lid body so as to close the hollow portion together with the lid body; a reinforcing member disposed along the fastening bracket within the cylindrical body so as to cross the penetration direction of the hollow portion of the cylindrical body, the reinforcing member having both ends connected to the cylindrical body; the lid body includes a flange portion at an end portion that abuts against the cylindrical body and that extends along a surface of a plate that constitutes the cylindrical body; Both ends of the reinforcing member are connected to the flange portion of the lid and the cylindrical body. Crash box.

2. a cylindrical body formed in a cylindrical shape to form a hollow portion therein, and crushed by a collision load input in a direction through the hollow portion to absorb collision energy; a plate-shaped lid body that covers an end of the cylindrical body so as to close the hollow portion and is joined to the cylindrical body by spot welding; a fastening bracket that supports a fastening hook used when fastening a vehicle body to another object by protruding the fastening bracket, is disposed on top of the lid body, and is fitted over an end of the cylindrical body and connected to the lid body so as to close the hollow portion together with the lid body; a reinforcing member disposed along the fastening bracket within the cylindrical body so as to cross the penetration direction of the hollow portion of the cylindrical body, the reinforcing member having both ends connected to the cylindrical body; The fastening bracket has a flange portion at an end portion that abuts against the cylindrical body and that extends along a surface of a plate that constitutes the cylindrical body, Both ends of the reinforcing member are connected to the cylinder by penetrating the flange portion of the fastening bracket, and the through hole of the flange portion of the fastening bracket is sized to substantially restrict the movement of the reinforcing member inserted into the through hole in a direction perpendicular to the insertion direction. Crash box.

3. a cylindrical body formed in a cylindrical shape to form a hollow portion therein, and crushed by a collision load input in a direction through the hollow portion to absorb collision energy; a plate-shaped lid body that covers an end of the cylindrical body so as to close the hollow portion and is joined to the cylindrical body by spot welding; a fastening bracket that supports a fastening hook used when fastening a vehicle body to another object by protruding the fastening bracket, is disposed on top of the lid body, and is fitted over an end of the cylindrical body and connected to the lid body so as to close the hollow portion together with the lid body; a reinforcing member disposed along the fastening bracket within the cylindrical body so as to cross the penetration direction of the hollow portion of the cylindrical body, the reinforcing member having both ends connected to the cylindrical body; The cover and the fastening bracket each have a flange portion at an end that abuts against the cylindrical body and extends along a surface of a plate that constitutes the cylindrical body, The flange portions of the cover and the fastening bracket are disposed so as to sandwich the end portion of the cylindrical body between them in the thickness direction of the cover and the fastening bracket, Both ends of the reinforcing member are connected to the flange portions of the cylindrical body and the lid body by passing through the flange portion of the fastening bracket. Crash box.

4. A crash box according to any one of claims 1 to 3, The cylindrical body is composed of a pair of half bodies, and the split direction of the half bodies coincides with the direction in which the reinforcing member extends toward both ends of the half body. Crash box.

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