JP2012035771A - Shock absorbing member for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately fix a mounting plate even when the thickness of a body part is small and obtain predetermined impact energy absorbing performance in a stable manner.SOLUTION: A bent flange 56 is integrally provided to one end of the body part 52 in an axial direction, and integrally fixed by welding to the mounting plate 54 in a closely adhered state, and hardening resin 60 is injected in a space formed between a bending R part 58 of the bent flange 56 and the mounting plate 54 so that the bending R part 58 is reinforced by the hardening resin 60. Even when the thickness of the body part 52 is small, the bending R part 58 is inhibited from undergoing bending deformation (buckling) when a compressive load F is applied in the axial direction of the body part 52, and predetermined impact energy absorbing performance is achieved in a stable manner. In particular, since all that is needed is to inject the hardening resin 60, easy manufacturing and a lightweight and inexpensive configuration can be achieved as compared to a reinforcement by using an L-shaped bracket or the like.

Description

  The present invention relates to an impact absorbing member for a vehicle, and in particular, even when the thickness of a cylindrical main body that is crushed in a bellows shape is thin, a mounting plate is appropriately fixed so that predetermined impact energy absorbing performance is stable. The present invention relates to a shock absorbing member to be obtained.

  It has a cylindrical main body and a mounting plate that is integrally fixed to the end of the main body in the axial direction, and the main body is bellows shaped by receiving a compressive load in the axial direction of the main body. 2. Description of the Related Art A vehicle impact absorbing member that is crushed by a shock absorber and absorbs impact energy is known (see Patent Document 1). FIG. 10 is a diagram for explaining an example of such a vehicle impact absorbing member. FIG. 10A is a schematic plan view of the vicinity of the bumper beam 10 on the front side of the vehicle as viewed from above the vehicle. Crash boxes 14R and 14L are provided as shock absorbing members at the front end portions of the members 12R and 12L, respectively. The bumper beam 10 has side members 12R and 12L via the crash boxes 14R and 14L at both right and left ends. Is attached. FIG. 10B is a cross-sectional view taken along the XB-XB cross section in FIG. 10A, that is, the vicinity of the right mounting portion. And a mounting member 22 integrally welded to one end of the direction, and in a posture in which the axial direction of the main body 20 is the front-rear direction of the vehicle, a side member is attached via a mounting plate 22 with a bolt or the like (not shown). It is fixed to 12R.

  When an impact is applied from the front of the vehicle and a compressive load F is received, the main body 20 is crushed in an accordion shape in the axial direction as shown in FIG. 10 (c), and the deformation at this time absorbs the impact energy. Then, the impact applied to the vehicle structure such as the side member 12R is reduced. In addition, the bumper beam 10 is left-right symmetric, and the left mounting portion is similarly configured. The bumper beam 10 functions as a bumper reinforcement (reinforcing member) and an attachment member, and a bumper body 16 made of synthetic resin or the like is integrally attached thereto.

  11 (a) to 11 (c) are diagrams for explaining several modes of welding and fixing between the main body portion 20 and the mounting plate 22. The upper drawing of each drawing is a perspective view, and the lower drawing is welding. It is sectional drawing of a fixing | fixed part. (a) is a case where the end of the main body 20 is fixed integrally by arc welding with the end of the main body 20 abutting perpendicularly to the mounting plate 22, and (b) is an end of the main body 20 to the outside. In the case where the bent flange 32 is integrally formed by bending at a right angle and the bent flange 32 is integrally fixed to the mounting plate 22 by arc welding, the end of the main body 20 is smaller than 90 °. A state in which the inclined flange 34 is integrally provided by bending at a predetermined angle, and a bulging portion 36 that is brought into surface contact with the inclined flange 34 is integrally provided on the mounting plate 22, and the inclined flange 34 is in close contact with the bulging portion 36. In this case, it is fixed integrally by arc welding. This (c) is an example of the impact absorbing member described in Patent Document 1. When the opposite end of the main body 20 is also fixed integrally to the bumper beam 10 via the mounting plate 24, the mounting plate 24 is also, for example, as shown in (a) to (c) of FIG. Are integrally fixed to the main body 20.

JP 2008-18792 A

  However, in the case of FIG. 11 (a), although a predetermined impact energy absorption performance can be stably obtained, if the thickness (plate thickness) of the main body portion 20 is thin, it melts during welding and a hole is formed. May become thin and the strength may decrease. In the case of (b), the main body portion 20 can be welded and fixed well even when the thickness of the main body portion 20 is thin. The impact energy absorption performance may be impaired. In the case of (c), similarly to (b), even when the thickness of the main body 20 is relatively thin, it can be fixed by welding well, and the bending deformation of the inclined flange 34 is suppressed. The main body 20 may fall due to the bending of the inclined flange 34, and there is still room for improvement. That is, as compared with the case where the end portion of the main body portion 20 is fixed to the mounting plate 22 as shown in FIG. In order to do so, it was necessary to increase the wall thickness.

  The present invention has been made against the background of the above circumstances. The purpose of the present invention is to stabilize the predetermined impact energy absorption performance by properly fixing the mounting plate even when the main body is thin. It is to be obtained.

  In order to achieve such an object, the first invention includes a cylindrical main body portion and a mounting plate integrally fixed to an end portion in the axial direction of the main body portion, and the axial direction of the main body portion. A shock absorbing member for a vehicle that receives a compressive load so that its body portion is crushed in a bellows shape and absorbs impact energy, and (a) the mounting plate is disposed at an end portion in the axial direction of the body portion. A bending flange bent so as to be in surface contact with the mounting plate is integrally provided, and the bending flange is integrally welded and fixed in close contact with the mounting plate, and (b) the bending flange is bent. The gap formed between the R portion and the mounting plate is filled with a synthetic resin.

  According to a second aspect of the present invention, in the vehicle impact absorbing member of the first aspect, (a) the mounting plate is provided with a lid member protruding toward the main body so as to close the gap, and (b) the The synthetic resin is filled in the gap closed by the lid member.

  According to a third aspect of the present invention, in the vehicle impact absorbing member of the second aspect, (a) the mounting plate is integrally provided with a bulging portion obtained by deforming the mounting plate so as to bulge toward the main body. And (b) the bulging portion functions as the lid member.

  In such a vehicle impact absorbing member, a bending flange is integrally provided at the end of the main body in the axial direction and is not only integrally welded and fixed in a state of being in close contact with the mounting plate. A synthetic resin is filled in a gap formed between the bent R portion of the flange and the mounting plate. For this reason, even if the bending R part is reinforced by the synthetic resin and the thickness of the main body part is thin, the bending R part undergoes bending deformation (buckling) when a compressive load is applied in the axial direction of the main body part. Therefore, a predetermined impact energy absorption performance can be stably obtained. In particular, since it only needs to be filled with a synthetic resin, it is simpler to manufacture and can be configured at a lower cost than in the case of reinforcement using an L-shaped bracket or the like.

  In the second invention, a lid member protruding toward the main body is provided on the mounting plate so as to close the gap, and the inside of the gap closed by the lid member is filled with synthetic resin, so that the resin melts. The spread is prevented and a predetermined filling density can be stably secured, and a predetermined reinforcing effect by the synthetic resin can be obtained reliably and stably.

  In the third invention, since the lid member is constituted by the bulged portion obtained by deforming the mounting plate so as to bulge from the mounting plate to the main body side, a separate lid member is prepared for the mounting plate. Compared with the case of fixing integrally, the number of parts and the number of manufacturing steps can be reduced and the configuration can be made inexpensively.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the impact-absorbing member for vehicles which is one Example of this invention, (a) is a perspective view, (b) is the longitudinal cross-sectional view cut | disconnected by the axial direction in the position containing the axial center O. FIG. It is a figure explaining the manufacture procedure of the impact-absorbing member for vehicles of FIG. FIG. 3 is a view showing the assembled state before the foamable curable resin is foamed and cured while being manufactured according to the procedure of FIG. 2, and is a longitudinal sectional view corresponding to FIG. The figure explaining the impact energy absorption performance using the present invention product filled with synthetic resin and the conventional product not filled with synthetic resin, (a) is a diagram explaining the test method, (b) is a figure which shows the measurement result of the load with respect to a displacement, and EA amount (absorption energy). It is sectional drawing explaining the case where the bending R part is bending-deformed by the compressive load F, and a main-body part falls down when the synthetic resin is not filled into the bending R part of a bending flange. It is a figure explaining the other Example of this invention, (a) is a longitudinal cross-sectional view corresponded to FIG.1 (b), (b) shows the state by which the resin sheet was affixed on the cover member and the cover member. FIG. 4C is a longitudinal sectional view corresponding to FIG. 3 in an assembled state before the synthetic resin is foamed and cured. It is a figure explaining another Example of this invention, (a) is a longitudinal cross-sectional view equivalent to FIG.1 (b), (b) shows the state by which the resin sheet was affixed on the cover member and its cover member. FIG. 4C is a longitudinal sectional view corresponding to FIG. 3 in an assembled state before the synthetic resin is foamed and cured. FIG. 6 is a diagram for explaining another embodiment of the present invention, in which (a) is a longitudinal sectional view corresponding to FIG. 1 (b), and (b) is a mounting plate and a resin sheet attached to the bulging portion of the mounting plate. FIG. 4C is a longitudinal sectional view corresponding to FIG. 3 in an assembled state before the synthetic resin is foamed and cured. FIG. 6 is a diagram for explaining still another embodiment of the present invention, which is two types in which mounting plates are integrally fixed at both ends in the axial direction of the main body, and each corresponds to a longitudinal section corresponding to FIG. FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the impact-absorbing member for vehicles, (a) is a schematic plan view which shows an example of a specific arrangement | positioning aspect, (b) is XB-XB sectional drawing in (a), (c) is compressive load F It is a figure which shows the state collapsed by the bellows shape by. It is a figure explaining three types of conventional examples at the time of fixing the main-body part of the impact-absorbing member for vehicles of FIG. 10 to a mounting plate.

  The vehicle impact absorbing member of the present invention is disposed, for example, between a vehicle structure such as a side member of the vehicle and the bumper beam. However, a load input member other than the bumper beam such as a radiator support and the vehicle structure are arranged. It can also be arranged in between. Such a vehicle impact absorbing member is disposed, for example, on both the front and rear sides of the vehicle, but may be disposed only on the front side or only on the rear side, and may be disposed on the front and rear sides of the vehicle. In this case, the present invention may be applied to only one of them.

  The shape of the bumper beam in the longitudinal direction, that is, the shape in plan view as viewed from above the vehicle, for example, is preferably a shape that is smoothly curved so that the central portion protrudes forward with respect to the front bumper. Alternatively, various modes such as inclining backward or bending only at both ends are possible. When the shock absorbing member is fixed to the bumper beam via the mounting plate, the mounting plate is fixed in a posture perpendicular to the axis O of the main body, for example, but the bumper beam is fixed to the axis O. In the case where the mounting plate is inclined, it is preferable that the mounting plate is fixed in a posture inclined with respect to the axis O so as to be parallel to the bumper beam.

  The present invention is applied when a mounting plate is integrally welded and fixed to at least one end portion in the axial direction of the main body. The mounting plate may be for fixing to a vehicle structure such as a side member, or for fixing to a load input member such as a bumper beam. When a pair of mounting plates are provided at both ends in the axial direction of the main body, the present invention can be applied to a fixed structure of the pair of mounting plates, respectively. You may apply only this invention.

  The bending flange is bent so as to be perpendicular to the axis O of the main body portion or inclined at a predetermined angle so as to be parallel to the mounting plate. Although it is desirable to provide the bent flange on the entire circumference of the main body, it can be divided into a plurality of parts according to the cross-sectional shape of the main body, for example, it may be provided only at four locations, top, bottom, left and right. Various aspects are possible. In addition, it is desirable that the bending flange be bent to the outside of the cylindrical main body, for example, but it is also possible to bend the inner side of the cylindrical main body.

  The bent flange and the mounting plate are fixed by spot welding at the surface contact part, or the tip edge, side edge, or outer peripheral edge of the bent flange is welded by arc welding. Although it can be fixed, spot welding and arc welding can also be used together.

  The bending radius (radius of the outer radius) of the bending flange does not need to be so small in the present invention because it is filled with synthetic resin, and varies depending on the material of the main body, for example, within a range of about 3 to 5 mm. Is desirable. As the material of the main body, for example, a rolled steel plate or a carbon steel pipe is preferably used, but various other metal plate materials and pipe materials that can obtain desired impact energy absorption performance by being crushed in a bellows shape are adopted. be able to.

  The cylindrical body portion may be a simple square tube shape such as a square cross section or a cylindrical shape, but a plurality of concave grooves are axially projected so as to protrude inside the cylinder shape so as to obtain a predetermined crushing strength. Various modes are possible, such as may be provided.

  As the synthetic resin, for example, a thermosetting resin or a thermoplastic resin that is foamed and cured by heat treatment at a predetermined temperature such as 150 ° C. to 250 ° C. is used. As thermosetting resins, for example, urea resins, melamine resins, phenol resins, epoxy resins, unsaturated polyester resins, alkyd resins, urethane resins, ebonites and the like are known, and fiber reinforced plastics (FRP) combined with high-strength fibers. ) Can also be adopted. Moreover, you may employ | adopt the thermoplastic resin which has comparatively high intensity | strength, such as polybutylene terephthalate, polyphenylene sulfide, and polyamideimide, and the fiber reinforced plastic (FRTP) which combined the high intensity | strength fiber and the thermoplastic resin.

  In the second and third inventions, the gap between the bent R portion of the bending flange and the mounting plate is closed by the lid member. In implementing the first invention, such a lid is used. A member is not necessarily required. In the third invention, the bulging portion that functions as a lid member is integrally provided on the mounting plate by drawing or the like by pressing. However, when implementing the second invention, a lid member is prepared separately from the mounting plate, It may be fixed integrally to the mounting plate by welding or the like. In addition, various modes are possible, such as cutting and bending a part of the mounting plate, or forming the lid member integrally with the mounting plate by burring or the like.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is used by being disposed between the side member 12R and the bumper beam 10 instead of the crash box 14R shown in FIG. 10, and corresponds to the vehicle impact absorbing member of the present invention. . The crash box 50 includes a cylindrical main body 52 and a mounting plate 54 that is integrally welded to one end of the main body 52 in the axial direction. It is disposed between the side member 12R and the bumper beam 10 in a posture substantially parallel to the front-rear direction, and is integrally fixed to the side member 12R via a mounting plate 54 with a bolt or the like (not shown). The bumper beam 10 is fixed to the other end of the main body 52 directly or through a mounting plate (not shown) or the like. When an impact is applied from the front of the vehicle and a compression load F is received. Like the crash box 14R, as shown in FIG. 10 (c), it is crushed in a bellows shape in the axial direction, and the shock energy is absorbed by the deformation at this time, and the vehicle structure such as the side member 12R is absorbed. Mitigates the impact applied.

  FIG. 1A is a perspective view of the crush box 50 of the present embodiment, and FIG. 1B is a longitudinal sectional view cut in the axial direction at a position including the axis O. The main body 52 is formed by, for example, a cylindrical pipe member (carbon steel pipe) formed into a predetermined shape by pressing, hydraulic forming, or the like. In this embodiment, the cross section perpendicular to the axis O forms a substantially square shape. As shown in FIG. 1 (a), four flat side surfaces are arranged on the side member 12R in such a manner that they are positioned vertically and horizontally. At one end in the axial direction of the main body 52, a bent flange 56 is provided continuously on the entire circumference of the cylindrical shape, and is bent to the outside of the cylindrical shape at right angles to the axis O. A flat mounting plate 54 is integrally welded and fixed in a state of surface contact with the bending flange 56. The mounting plate 54 has a square shape that is sufficiently larger than the main body portion 52, and the outer peripheral portion of the mounting plate 54 is aligned so that the outer peripheral portion protrudes outward from the bending flange 56. By applying fillet welding to the peripheral edge by arc welding, the mounting plate 54 is integrally welded to the bent flange 56. The weld W in FIG. 1 is this fillet weld.

  The bending flange 56 has a bending R portion 58 whose outer bending R indicated by an arrow (→) in FIG. 1B is about 3 mm, for example, and is formed between the bending R portion 58 and the mounting plate 54. The void having a triangular cross section is filled with a curable resin 60 as a synthetic resin. The curable resin 60 is obtained by foaming and curing a thermosetting resin by heating. In this embodiment, an epoxy-based foam curable resin is used. Then, the gap between the bent R portion 58 and the mounting plate 54 is filled with the curable resin 60, so that the bent R portion 58 is reinforced so as not to be further bent. On the mounting plate 54, a quadrangular prism-shaped lid member 62 having an outer dimension substantially the same as the inner dimension of the main body 52 is integrally fixed by resistance welding or the like, and the mounting plate 54 is in close contact with the bent flange 56. Thus, when the lid member 62 is fitted inside the main body 52, the triangular gap is closed. That is, an annular closed space surrounded by the lid member 62, the bent R portion 58, and the mounting plate 54 is formed around the lid member 62, whereby the curable resin 60 is heated and foamed. When cured, it is well retained in the closed space and cured at a predetermined packing density. The closed space does not necessarily need to be sealed so as to completely prevent the resin from flowing out. The flow of the curable resin 60 is limited and the curable resin 60 may be cured at a predetermined filling density. There is no problem even if it flows out a little.

  2 and 3 are diagrams for explaining the manufacturing procedure of the crash box 50 of the present embodiment. First, a main body 52 provided with a bending flange 56, a square mounting plate 54, and a flat quadrangular prism shape. The lid member 62 is prepared. The main body 52 is formed into a quadrangular cross section by, for example, subjecting a carbon steel pipe to press working or hydraulic forming, and the bent flange 56 is formed by expanding one end to the outer peripheral side by ironing or the like. It is also possible to manufacture the main body 52 by, for example, winding a flat carbon steel plate or the like into a quadrangular prism shape. The mounting plate 54 can be manufactured, for example, by stamping a steel plate having a predetermined thickness with a press. The lid member 62 can be manufactured by punching with a press using a steel plate having a thickness corresponding to the height of a square pillar, for example, but can also be manufactured by forging.

  Then, a soft resin sheet 64 made of curable resin 60 before being foamed and cured is wound around the outer peripheral surface of the lid member 62 and attached thereto, and the lid member 62 is fixed to the mounting plate 54 integrally by resistance welding or the like. Set up. Thereafter, the lid member 62 is fitted into the main body portion 52 and is folded by arc welding in a state where the mounting plate 54 is aligned with the main body portion 52 so that the mounting plate 54 is in close contact with the bending flange 56. The mounting plate 54 is integrally fixed to the bending flange 56. FIG. 3 shows the state in which the mounting plate 54 is integrally welded and fixed to the bending flange 56 of the main body 52 as described above, and the resin sheet 64 is surrounded by the mounting plate 54, the bent R portion 58, and the lid member 62. In this state, the resin sheet 64 is heated to about 170 to 200 ° C. and held for about 20 minutes, whereby the resin sheet 64 is foamed and cured in the space. Thereby, as shown in FIG. 1, the crush box 50 in which the curable resin 60 is filled in the space having a triangular cross section is obtained.

  Thus, according to the crash box 50 of the present embodiment, the bending flange 56 is integrally provided at one end of the main body 52 in the axial direction, and is integrally welded and fixed in close contact with the mounting plate 54. In addition, since the curable resin 60 is filled in the gap formed between the bending R portion 58 of the bending flange 56 and the mounting plate 54, the bending R portion 58 is reinforced by the curable resin 60. Even when the thickness of the main body 52 is thin, when the compressive load F is applied in the axial direction of the main body 52, the bending R portion 58 is prevented from being bent and deformed (buckling), and a predetermined impact is applied. Energy absorption performance can be obtained stably. In particular, since it is only necessary to fill the curable resin 60, the manufacturing is simpler, lighter and less expensive than the case where reinforcement is performed using an L-shaped bracket or the like.

  Further, in this embodiment, a lid member 62 protruding into the main body 52 is provided on the mounting plate 54 so as to close the gap, and the curable resin 60 is confined in the gap closed by the lid member 62. Therefore, the resin can be prevented from melting and spreading during heating and curing, and a predetermined filling density can be stably secured, and a predetermined reinforcing effect by the curable resin 60 can be obtained stably and reliably.

  Here, a product of the present invention of the above embodiment and a conventional product (equivalent to FIG. 11 (b)) without the lid member 62 and the curable resin 60 are prepared, and as shown in FIG. 4 (a), the mounting plate When the load / displacement was measured with a static load of 50 mm / min from the axial direction of the main body 52 in a state in which 54 was positioned below, the result shown in FIG. 4B was obtained. The solid line in FIG. 4 (b) is the product of the present invention, the broken line is the conventional product, and the EA amount (absorbed energy) corresponds to the integral value of the load. In both the product of the present invention and the conventional product, the thickness of the main body 52 is 1.2 mm, the length in the axial direction is 150 mm, and the length (outside dimension) of one side of the square section is 40 mm.

  As is apparent from the result of FIG. 4 (b), according to the product of the present invention, bending deformation at the initial stage of load input is suppressed, and a decrease in initial load is prevented. In addition, since the load is appropriately transmitted through the main body 52 without falling down, the proper axial crushing form is maintained even when the displacement becomes 20 mm or more, and the shock energy is appropriately absorbed. can do. On the other hand, in the case of a conventional product without the lid member 62 and the curable resin 60, the bending R portion 58 is bent and deformed (buckled) as shown by the broken line in FIG. When the initial load is reduced and the displacement is 20 mm or more, the load becomes lower than that of the product of the present invention, and sufficient impact energy absorption performance cannot be obtained.

  Next, another embodiment of the present invention will be described. In the following embodiments, parts that are substantially the same as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  The crush box 70 shown in FIG. 6 has a lid member 72 formed into a hat shape by subjecting a plate material to a drawing process by pressing or the like instead of the square columnar lid member 62. (The top of the hat) is integrally fixed to the mounting plate 54 by resistance welding or the like, so that the lid member 72 is surrounded by the mounting plate 54, the bent R portion 58, and the lid member 72. A space is formed, and the curable resin 60 is foamed and cured in the closed space. Such a crush box 70 has a hat-shaped lid member 72 prepared by punching or drawing with a press as shown in FIG. 6B, and foamed around the hat-shaped head 74. The resin sheet 64 before curing is wound and pasted. The lid member 72 is integrally fixed to the mounting plate 54 by resistance welding or the like as shown in (c), and is attached so that the hat-shaped flange 76 is fitted into the main body 52. The plate 54 is assembled to the main body 52, and fillet welding is performed on the outer peripheral edge of the bending flange 56, and the mounting plate 54 is integrally fixed by welding. Thereafter, the resin sheet 64 is foamed and cured by heating, so that the annular closed space around the lid member 72 is filled with the curable resin 60 as shown in FIG. 6 (a) is a longitudinal sectional view corresponding to FIG. 1 (b), FIG. 6 (b) is a perspective view showing the lid member 72, and a resin sheet 64 is attached to the lid member 72 on the right side of the arrow. FIG. 4C is a longitudinal sectional view corresponding to FIG. 3 in the assembled state before the resin sheet 64 is foamed and cured.

  Also in this embodiment, since the curable resin 60 is filled in the gap formed between the bending R portion 58 of the bending flange 56 and the mounting plate 54, the bending R portion 58 is formed by the curable resin 60. Even when the main body 52 is thin and thin, when the compressive load F is applied in the axial direction of the main body 52, the bending R portion 58 is restrained from bending deformation (buckling). The same effects as in the above-described embodiment can be obtained, for example, the impact energy absorption performance can be obtained stably.

  The crush box 80 of FIG. 7 is a case where the lid member 82 is made of a synthetic resin material, and the lid member 82 has a hat shape integrally including a head portion 84 and a flange portion 86 like the lid member 72. is doing. Further, a latching claw 88 is integrally provided at the central portion of the head 84 so as to protrude outward, and is latched by being inserted through a latching hole 90 provided in the mounting plate 54. Thus, the lid member 82 is integrally attached to the attachment plate 54 with one touch. In such a crash box 80, as shown in FIG. 7B, a hat-shaped lid member 82 is integrally formed, and a resin sheet 64 before being foamed and cured is wound around the hat-shaped head portion 84. And stick. Then, by inserting the latching claw 88 of the lid member 82 into the latching hole 90 of the mounting plate 54, the lid member 82 is integrally attached to the mounting plate 54 with one touch as shown in FIG. At the same time, the mounting plate 54 is assembled to the main body 52 so that the hat-shaped flange 86 is fitted in the main body 52, and fillet welding is applied to the outer peripheral edge of the bending flange 56 so that the mounting plate 54 is integrated. To be welded. Thereafter, the resin sheet 64 is foamed and cured by heating, so that the annular closed space around the lid member 82 is filled with the curable resin 60 as shown in FIG. 7A is a longitudinal sectional view corresponding to FIG. 1B, FIG. 7B is a perspective view showing the lid member 82, and the right side of the arrow is a resin sheet 64 attached to the lid member 82. FIG. FIG. 4C is a longitudinal sectional view corresponding to FIG. 3 in the assembled state before the resin sheet 64 is foamed and cured.

  Also in this embodiment, since the curable resin 60 is filled in the gap formed between the bending R portion 58 of the bending flange 56 and the mounting plate 54, the bending R portion 58 is formed by the curable resin 60. Even when the main body 52 is thin and thin, when the compressive load F is applied in the axial direction of the main body 52, the bending R portion 58 is restrained from bending deformation (buckling). The same effects as in the above-described embodiment can be obtained, for example, the impact energy absorption performance can be obtained stably. In addition, since the lid member 82 is made of a synthetic resin material, the lid member 82 can be configured to be lighter, simpler and cheaper than a press-molded product, and can be attached to the mounting plate 54 with one click by the latching claw 88. Therefore, the manufacturing cost is reduced as compared with the case where welding is fixed by resistance welding or the like.

  In the crash box 100 of FIG. 8, instead of providing the lid member 62, 72, or 82 separately as in the above embodiment, the bulging portion 104 fitted into the main body portion 52 is integrated by drawing or the like. The formed mounting plate 102 is provided, and an annular closed space having a triangular cross section is formed around the bulging portion 104, and the curable resin 60 is foamed and cured in the closed space. . In such a crash box 100, as shown in FIG. 8B, a hat-shaped mounting plate 102 having a bulging portion 104 is prepared by punching or drawing with a press, and the mounting plate 102 is expanded. A resin sheet 64 before foaming and curing is wound around and stuck to the periphery of the protruding portion 104. In the mounting plate 102, as shown in (c), the bulging portion 104 is fitted into the main body portion 52, and the flat portion 106 on the outer peripheral side corresponding to the hat-shaped flange portion has a bent flange 56. In this state, the mounting plate 102 and the main body 52 are integrally welded and fixed by performing fillet welding on the outer peripheral edge of the bending flange 56. Thereafter, the resin sheet 64 is foamed and cured by heating, so that the annular closed space around the bulging portion 104 is filled with the curable resin 60 as shown in FIG. 8 (a) is a longitudinal sectional view corresponding to FIG. 1 (b), FIG. 8 (b) is a perspective view showing the mounting plate 102, and the right side of the arrow has a resin sheet 64 attached to the bulging portion 104. FIG. (C) is a longitudinal sectional view corresponding to FIG. 3 in an assembled state before the resin sheet 64 is foamed and cured.

  Also in this embodiment, since the curable resin 60 is filled in the gap formed between the bending R portion 58 of the bending flange 56 and the flat portion 106 of the mounting plate 102, the bending is performed by the curable resin 60. Even when the R portion 58 is reinforced and the main body portion 52 is thin, the bending R portion 58 is prevented from bending (buckling) when a compressive load F is applied in the axial direction of the main body portion 52. In addition, the same effects as those of the above-described embodiment can be obtained, for example, a predetermined impact energy absorption performance can be stably obtained. In addition, since the bulging portion 104 that functions as the lid members 62, 72, and 82 is provided integrally with the mounting plate 102, the number of parts and the number of manufacturing steps can be reduced and the configuration can be further reduced.

  FIG. 9 shows two examples of the crash box 100 of FIG. 8 in which the mounting plate is welded and fixed to the opposite end of the main body 52 in the axial direction, that is, the end fixed to the bumper beam 10. 9A and 9B are longitudinal sectional views corresponding to FIG. 1B. The crash box 110 in FIG. 9A is a case where a pair of mounting plates 102 are symmetrically welded and fixed to both end portions in the axial direction of the main body portion 52, and bent at both end portions of the main body portion 52. A flange 56 is provided. Then, at both end portions of the main body portion 52, the gaps formed between the bending R portion 58 of the bending flange 56 and the flat portion 106 of the mounting plate 102 are filled with a curable resin 60, respectively. The bent R portion 58 is reinforced.

  The crash box 120 of FIG. 9B is a case where the bumper beam 10 is inclined with respect to the axis O, and the mounting plate 122 on the bumper beam 10 side is also inclined corresponding to the inclination of the bumper beam 10. The bending flange 130 provided integrally with the main body 52 is also inclined with respect to the axis O so as to be in close contact with the flat portion 126 of the mounting plate 122. The mounting plate 122 is integrally provided with a bulging portion 124 that protrudes toward the main body 52 in parallel with the axis O so as to be fitted into the main body 52 by drawing or the like. Functions as a lid member, and the gap formed between the bending R portion 132 of the bending flange 130 and the flat portion 126 of the mounting plate 122 is closed, and the closed space is filled with the curable resin 60 and bent. The R portion 132 is reinforced.

  9 is a case where the attachment plates 102 or 122 are welded and fixed to both ends of the main body 52 in the axial direction with respect to the crash box 100 of FIG. 8, but the other crash boxes 50, 70, As for 80, the mounting plate is welded and fixed to the opposite side in the axial direction as required as shown in FIG.

  As mentioned above, although the Example of this invention was described in detail based on drawing, these are one Embodiment to the last, This invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

  50, 70, 80, 100, 110, 120: Crash box (vehicle shock absorbing member) 52: Body 54, 102, 122: Mounting plate 56, 130: Bending flange 58, 132: Bending R 60: Curing Resin (synthetic resin) 62, 72, 82: lid member 104, 124: bulging portion (lid member) W: welded portion O: shaft center F: compression load

Claims (3)

It has a cylindrical main body and a mounting plate integrally fixed to the axial end of the main body, and the main body is bellows-shaped by receiving a compressive load in the axial direction of the main body. A shock absorbing member for a vehicle that is crushed by and absorbs shock energy,
A bending flange that is bent so as to be brought into surface contact with the mounting plate is integrally provided at an end portion in the axial direction of the main body, and the bending flange is integrally attached in a state of being in close contact with the mounting plate. Fixed by welding,
A vehicular impact absorbing member, wherein a synthetic resin is filled in a gap formed between a bent R portion of the bent flange and the mounting plate. The mounting plate is provided with a lid member protruding toward the main body so as to close the gap.
The shock absorbing member for a vehicle according to claim 1, wherein the synthetic resin is filled in the gap closed by the lid member. The mounting plate is integrally provided with a bulging portion obtained by deforming the mounting plate so as to bulge toward the main body.
The impact absorbing member for a vehicle according to claim 2, wherein the bulging portion functions as the lid member.

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