JP2002012107A - Bumper stay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bumper stay capable of stably and surely absorbing much impact energy in collision. SOLUTION: This bumper stay 10 comprises a body 11, which is made from an aluminum alloy extruded structural angle having a specified length and a hollow section 16 and arranged between a bumper 1 and a frame 6 such that the extrusion direction and the longitudinal direction of a car body intersect each other orthogonally, and a rectangular parallelepiped 21 arranged along the longitudinal direction of the car body in the hollow section 16 of the body 11 and having a hollow section 22, and includes a damping body 20 for absorbing energy by performing buckling-deformation into a bellows-like shape along the longitudinal direction of the car body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper stay which is disposed before and after a vehicle body of an automobile or the like and efficiently absorbs energy at the time of a collision. In this specification, a bumper reinforcement, which is a strength member of a bumper, is simply referred to as a bumper. The frame refers to, for example, a side frame or other structural material on the vehicle body side to which a bumper is attached via a bump pasty.

[0002]

2. Description of the Related Art As shown in FIG.
10 is a bumper 102 at the front 100 of the car
Between the bumper reinforcement 105 and the flange 108 of the frame 106, which are disposed between the
It is fixed by bolts or the like (not shown). As shown in FIG. 6 (B), the conventional bump pasty 110 is obtained by cutting an extruded shape of an aluminum alloy at a predetermined length orthogonal to the extrusion direction, and has a narrow shock absorbing stage near the bumper 102. 111 and a wide shock absorbing step 116 near the frame 106. The left shock absorbing stage 111 is
A rectangular piece 112 in which a hollow section 114 having a rectangular cross section is provided between a pair of short pieces 113.
It has a rectangular cross section composed of a pair of long pieces 115, 117 and short pieces 118, 118, and three hollow portions 120 are formed inside by a pair of partition walls 119.

[0006] As shown in FIG. 6B, the bumper stay 110 has a pair of partition walls 119 and a short piece 1 of the shock absorbing step 111 with respect to a long piece 115 between the shock absorbing steps 111 and 116.
13 is set to be 3 times the thickness of the long piece 115.
It is set to more than twice. Thereby, the bump pasty 11
0, when a shock shown by an arrow in FIG. 6B is received at the time of collision, the short piece 113, both end portions 115a of the long piece 115, and the short piece 118 are deformed as indicated by broken lines,
1 collapses, after which the shock absorbing stage 116 collapses. Thereby, the collision energy is absorbed while shifting the start time of the buckling deformation (see Japanese Patent Application Laid-Open No. 8-58499).

A bump pasty 122 shown in FIG.
Also, the extruded shape of the aluminum alloy is cut at a predetermined length perpendicular to the extrusion direction, and the hollow portion 125 of the outer rectangular portion 123 formed by the long piece 123 and the pair of short pieces 124
And an inner rectangular portion 126 including a pair of short pieces 127 in which the hollow portion 129 is provided, near the frame-side long piece 128 in the hollow portion 125. The long piece 128
Flanges 130 project symmetrically on both sides.
As shown in FIG. 6 (C), at the time of a collision, the bump pasty 122 first compresses and deforms from the left side of the outer rectangular portion 123 to the right to absorb the collision energy at the initial stage of the collision, and subsequently, the inner rectangular portion 126 Is compressed together with the remaining outer rectangular portion 123 toward the long piece 128 to absorb the second collision energy. By generating such a two-stage deformation, the bump pasty 122 attempts to absorb more energy generated at the time of collision (Japanese Patent Laid-Open No. 7-2).
No. 77112).

[0005]

However, in the bump pasty 110, despite the complicated cross-sectional shape, the deformation of the shock absorbing step 111 at the time of a collision causes the short piece 113,
Since both ends 115a of the long piece 115 and the short piece 118 are easily deformed as shown by the broken lines in FIG. 6B, the amount of energy absorption required for the deformation is extremely small. Also, when the shock absorbing step 116 is deformed, both ends 11
5A and the short piece 118 are deformed as shown by the broken lines in FIG. 6B, so that the three hollow portions 1 absorb the collision energy.
Only 20 of the 20 were not sufficient to absorb more of the collision energy.

On the other hand, the bump pasty 122 also has double hollow portions 125 and 129 inside and outside. However, since the short piece 124 forming the outer rectangular portion 123 has a long dimension, it buckles with a small force, so that a small amount of energy is absorbed. . Moreover, depending on the direction in which the short piece 124 buckles, the inner rectangular portion 1
There is a problem that the 26 hollow portions 129 may not smoothly generate two-stage deformation at the time of collision, and are insufficient to stably absorb a large amount of collision energy. SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the conventional technology described above and to provide a bump pasty that stably and reliably absorbs a large amount of collision energy at the time of a collision.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a bellows-like buckling deformation along the longitudinal direction of a vehicle body in a hollow portion of a body made of an extruded aluminum alloy material. This is achieved with the idea of arranging a buffer that absorbs energy. That is, the bump pasty of the present invention is made of an extruded shape member of an aluminum alloy, has a hollow portion, and has a required length disposed between the bumper and the frame such that the extrusion direction is orthogonal to the front-rear direction of the vehicle body. And a shock absorber that is disposed along the substantially front-rear direction of the vehicle body in the hollow portion of the body and absorbs energy by buckling and deforming in a bellows shape along the direction. .

According to this, the load generated at the time of the collision first acts on the portion of the main body near the bumper, then acts on the main body and the buffer, and then is transmitted to the frame. When this load reaches a certain level or more, the main body and the shock absorber start buckling deformation, and when the buckling deformation starts, the collision energy is consumed by the buckling deformation, so that the collision energy applied to the frame is small. Become. Therefore, the energy transmitted to the vehicle body structure and the occupant can be reduced. As described above,
When the load caused by the collision reaches a certain level or more, the cushioning body is continuously buckled and deformed sequentially from the part near the bumper or the part near the frame, and absorbs the collision energy while deforming in a bellows shape. Go. At the same time, the main body also gradually deforms following the buckling deformation of the shock absorber.

Therefore, compared with the conventional bump pasty having only the main body alone, a large amount of collision energy at the time of collision can be absorbed gradually and surely efficiently, so that the safety of the occupant can be improved. Becomes Further, even if the buffer has a relatively small cross section, it absorbs energy while repeating buckling deformation, so that it can absorb relatively large energy. Further, the shock absorber is housed in the main body, and the main body as the support means of the bumper and the shock absorber as the collision energy absorbing means are formed separately, so that the main body and the shock absorber are adapted to the vehicle body and the bumper. An optimal shape can be selected. For example, it is also possible to change only the buffer according to the type of vehicle and to use a common body.

[0010] A buffer that absorbs energy by buckling and deforming in a bellows shape as described above is disclosed in JP-A-8-21.
6917 and JP-A-11-320116. As in the inventions described in these publications, by forming a deformed portion serving as a starting point of buckling in advance at or near the tip end of the buffer, the load at which buckling starts in the buffer is reduced, and It is possible to reduce the applied impact load. It is known that the amount of energy absorbed only slightly decreases when the deformed portion is formed. Therefore, the peak load at the start of buckling can be reduced and the impact load transmitted to the frame can be reduced by forming the deformed portion that is the starting point of buckling in the cushioning body of the present invention in advance. Further, the size of the hollow portion formed in the main body is set to a size that does not hinder the bellows-like buckling deformation performed by the buffer body to be stored.

[0011] The cushioning member may be an aluminum alloy having a required length having one or more hollow portions having a square or rectangular cross section or a hollow portion having a circular cross section or a polygonal cross section having four or more even sides. Bump pasties made of extruded shaped materials are also included. According to this, the amount of energy to be absorbed can be easily set or changed by using a buffer having a desired number of hollow portions according to the vehicle body to be mounted. In addition, as in the case of the main body, the shock-absorbing body is easily formed with a good shape and dimensional accuracy by simply cutting an extruded shape having a predetermined cross-sectional shape at a required length in a direction orthogonal to the extrusion direction. be able to. The polygon in the cross section of the hollow portion includes a regular square, a regular hexagon, a regular octagon, a regular decagon, a regular decagon, and the like.

[0012] The present invention also includes a bump pasty in which a concave groove for receiving an end of the cushion is formed in a hollow portion of the main body. According to this, the buffer can be easily arranged along the front-rear direction of the vehicle body only by inserting the end of the buffer having a required length into the concave groove in the hollow portion of the main body. . In this case, when the concave groove is formed as a pair of opposed grooves in the hollow portion, the buffer can be more easily arranged along the front-rear direction of the vehicle body. Further, when the concave groove is formed by a pair of parallel ridges in the hollow portion of the main body, the main body can be provided with a reduced thickness.
In addition, the buffer body whose end is inserted into the concave groove and is disposed in the hollow portion is, for example, caulked so that the pair of ridges of the main body exposed at the top and bottom thereof approach each other, or the cushion body from the outside of the main body. The positioning can be easily performed by driving a screw, a pin, or the like into the hollow portion, or by fixing a cover plate described below.

[0013] Further, a cover plate is fixed to the entire end surface of the hollow portion of the main body or a position close to the frame.
Bump pasties are also included. According to this, since the rigidity of the main body having the hollow portion can be increased, more energy can be effectively absorbed at the time of collision in combination with the buffer. Moreover, in the form in which the cover plate is fixed at a position near the frame on the end face of the hollow portion of the main body, the buckling deformation of the main body can be generated in two stages, and the energy can be absorbed in two stages. And the amount of energy absorption can be increased.

Furthermore, a bump pasty in which a screw hole for receiving a screw or the like penetrating the cover plate is provided in the hollow portion of the main body is also included. According to this, the cover plate can be easily fixed to the end face in the hollow portion of the main body. In addition, for the cover plate, aluminum alloy plate, steel plate, etc.
Any material can be used. When the lid plate is made of the same type of aluminum alloy as the main body, it can be fixed to the end face of the hollow portion of the main body by welding. However, in this case, necessary heat treatment is appropriately performed after welding.

[0015]

Preferred embodiments of the present invention will be described below with reference to the drawings. 1 and 2 relate to an embodiment of a bump pasty 10 according to the present invention. FIG. 1 (A)
A state in which bump pasties 10, 10 according to an embodiment of the present invention are arranged between both ends of the bumper 1 and the frames 6, 6 is shown. The bumper 1 includes a bumper reinforcement 2 having a skin 3 on the outside, and bump pasties 10, 10 are arranged on rear surfaces 5, 5 of both ends 4, 4, respectively. Also,
The frame 6 has a hollow section 7 having a rectangular cross section and a flange 8 at the tip. The bump pasty 10 is shown in FIG.
As shown in (A), reinforcement 2 of bumper 1
Are fixed to the flange 8 of the frame 6 by the same bolts and nuts.

As shown in FIGS. 1 (B) and 1 (C), the bump pasty 10 includes a main body 11 having a substantially rectangular parallelepiped shape, and a buffer body 20 disposed in a hollow portion 16 thereof. Body 11
Is an aluminum alloy (JIS: A6063, A6N0)
1, A6061 etc. are tempered at T5, T6) and cut at a predetermined length perpendicular to the extrusion direction, as shown in FIGS. 1 (B) and (C). The front end wall 12 on the bumper 1 side, the rear end wall 15 on the frame 6 side, and a pair of side walls 1 connecting these left and right and extending along the front-rear direction of the vehicle body
3 and 14 are integrally provided.

As shown in FIGS. 1B and 1C, the front and rear end walls 12 and 15 in the hollow portion 16 are provided with a pair of ridges 17.
And a concave groove 18 sandwiched therebetween are formed to face each other. Further, flanges 19,
19 are symmetrically extended, and the bolts and nuts (not shown) penetrate through holes 19a provided therein.
0 can be fixed to the flange 8 of the frame 6. As a result, the main body 11 of the bumper stay 10 is fixed between the bumper 1 and the frame 6 with the pushing direction orthogonal to the front-rear direction of the vehicle body.

As shown in FIGS. 1B and 1C, the main body 1
Both ends of the buffer 20 are inserted into the one hollow portion 16 between the concave grooves 18 facing each other, and the buffer 20 is disposed along the longitudinal direction of the buffer 20 in the front-rear direction of the vehicle body. still,
It is desirable that the buffer body 20 is disposed at a substantially vertical center in the hollow portion 16 of the main body 11. For this reason, after arranging the buffer 20 in the hollow portion 16, the buffer 20 is positioned by, for example, caulking a pair of ridges 17 exposed above and below so as to approach each other.

As shown in FIG. 2 (A), the buffer 20 is formed of a rectangular parallelepiped 21 having a hollow portion 22 having a square cross section. And cut at a predetermined length perpendicular to. In FIG. 2A, when the shock absorber 20 receives a load P due to a collision along its axis from the left end face in FIG. 2A, for example, as shown in FIG.
Project outward to form a convex portion 26, and upper and lower sides 23 on the left end face are outwardly concave, and a concave portion 28 is formed by buckling deformation adjacent thereto. The convex portions 26 and the concave portions 28 are formed alternately in the circumferential direction at the same position in the longitudinal direction of the buffer 20. Due to the subsequent load, the protrusion 26
A concave portion 28 is formed by buckling deformation on the right side of the concave portion, and at the same time, a convex portion 26 is formed on the right side of the concave portion 28. On the same side surface of the buffer 20, the convex portions 26 and the concave portions 28 are alternately formed toward the right side. And a recess 2 on the adjacent side.
8 and the protrusion 26 are formed in the same manner.

As described above, buckling deformation occurs continuously,
The buckling deformation absorbs the collision energy. As a result, as shown in FIG. 2 (B), the buffer 20 becomes a buffer 20a whose length in the longitudinal direction is compressed to half or less of the initial length, for example, about a quarter. The buckling deformation starts from the front-back end of the buffer body 20 which is an end portion (bumper side or frame side) that is weak against the front-back deformation force of the vehicle body. By reducing the size, the impact force transmitted to the frame 6 before the start of buckling can be reduced. For this reason, as shown in FIG.
By alternately forming the deformed portions k1 that are recessed toward the hollow portion 22 and the deformed portions k2 that swell outward in advance on each side of the end portion, the load at the start of buckling can be reduced and the impact force can be reduced.

FIG. 2 (C) shows a vertical cross section of the bump pasty 10 shown in FIGS. 1 (B) and 1 (C). In this state, as shown in FIG. It is fixed between the frame 6. When the vehicle body to which the bumper stay 10 is attached collides with another vehicle, the load is transferred from the bumper reinforcement 2 of the bumper 1 to the tip wall 12 of the main body 11,
It is transmitted to the end of the buffer 20 on the bumper 1 side. On this occasion,
When the load reaches a certain level or more, as shown in FIGS. 2A and 2B, the buffer 20 sequentially moves from the portion closer to the bumper to the portion closer to the frame, for example.
Are alternately formed by buckling deformation and gradually buckle along the front-back direction of the vehicle body. Following this deformation, the side walls 13 and 14 of the main body 11 buckle and deform from a position closer to the bumper toward a position closer to the frame. As a result, as shown in FIG. 2D, the bump pasty 10 becomes the bump pasty 10a in which the main body 11 and the buffer 20a are horizontally compressed.

In the above deformation process, bump pasty 1
In the case of 0, the collision energy can be efficiently absorbed by the compression deformation by the buffer 20. Therefore, by using the bump pasty 10, the collision energy applied to the frame 6 side can be reduced, so that the safety of the occupant can be achieved. Moreover, the bumper stay 10 can be easily manufactured by simply cutting the extruded aluminum alloy material having a predetermined cross-sectional shape into the main body 11 and the buffer body 20 at a required length so as to be orthogonal to the extrusion direction. By simply inserting and positioning the buffer body 20 between the concave grooves 18 between the pair of ridges 17 in the hollow portion 16 of the obtained main body 11, it can be easily manufactured by a small and simple process. . Furthermore, since the main body 11 and the buffer 20 are made of a hollow aluminum alloy material, the bumper stay 10 itself is also lightweight, and has the advantage that the fuel efficiency of the vehicle body is not easily reduced. The deformed bump pasty 10a after the collision can be used immediately in the recycling process as it is, which is preferable from an environmental point of view.

FIG. 3A shows a bump pasty 3 having a different form.
0 shows a plan view. As shown in FIG. 3 (A), the bump pasty 30 includes a main body 31 and a buffer 40 disposed in a hollow portion 36 thereof. The main body 31 is formed by cutting the same aluminum alloy extruded profile at a predetermined length perpendicular to the extrusion direction, and has a front end wall 32 inclined in accordance with the shape of the bumper 1 and a rear side of the frame 6 side. An end wall 35 and a pair of side walls 33, 34 connecting the left and right sides thereof and extending in the front-rear direction of the vehicle body are integrally provided. A pair of ridges 37 and a groove 38 interposed therebetween are formed on the front and rear end walls 32 and 35 in the hollow portion 36 so as to face each other.
In addition, the front wall 32 is provided with a thick portion 32 a so that the concave groove 38 faces the concave groove 38 of the rear end wall 35 in parallel.

Further, flanges 3 are provided on both sides of the rear end piece 35.
9 and 39 extend symmetrically, and the bumper stay 30 can be fixed to the flange 8 of the frame 6 by bolts and nuts (not shown) penetrating therethrough. As shown in FIG. 3 (A), in the hollow portion 36 of the main body 31, the concave groove 3 is formed.
Both ends of the shock absorber 40 are inserted between 8, 38, and the shock absorber 40 is disposed along its longitudinal direction along the front-rear direction of the vehicle body. As shown in FIG. 3 (B), the buffer body 40 is obtained by cutting an extruded shape having a main body 41 having a rectangular cross section and a pair of hollow portions 42 into a required length. The buffer body 40 is disposed in the hollow portion 36 of the main body 31 with the pair of hollow portions 42 arranged vertically. Further, the buffer body 40 is capable of buckling deformation similar to the buffer body 20 shown in FIGS. 2A and 2B, and a portion along the longitudinal direction of each hollow portion 42 is formed in the buffer body 20. Equivalent to.

According to the bump pasty 30 described above, the provision of the buffer body 40 having a large cross-sectional area makes it possible to reliably absorb more collision energy during a collision. Further, instead of the buffer 40, a buffer 44 shown in FIG. 3C may be used. The buffer 44 is obtained by cutting an extruded member having a rectangular cross-section main body 46 and three hollow portions 48 in series to a required length. Such a buffer 4
By arranging 4 in the hollow portion 36 of the main body 31, it is possible to reliably absorb more energy.
The cushions 40, 44 are inserted between the concave grooves 38, 38 in the hollow portion 36 of the main body 31, and the ridges 37 exposed at the top and bottom thereof are provided.
When the length of the buffer 4 is short or almost nil, screws or pins are screwed into the hollow portions 42, 48 of the buffers 40, 44 from outside the front and rear end walls 32, 35, and the like.
0,44 can be positioned.

FIG. 3D is a plan view of a bump pasty 50 having a further different form. The bump pasty 50 is shown in FIG.
As shown in (1), it comprises a main body 51 and a buffer body 60 disposed in a hollow portion 56 thereof. The main body 51 is obtained by cutting the same extruded section at a predetermined length orthogonal to the extrusion direction, and includes a slanted front end wall 52 following the shape of the bumper 1, a rear end wall 55 on the frame 6 side, and And a pair of side walls 53 and 54 integrally connected to each other along the front-rear direction of the vehicle body. The front and rear end walls 52 and 55 in the hollow portion 56 have a pair of ridges 57 and a wide groove 58 sandwiched therebetween.
Are formed facing each other. The front wall 52 is also provided with a thick portion 52a so that the concave groove 58 faces the concave groove 58 of the rear end wall 55 in parallel.

Further, flanges 5 are provided on both sides of the rear end piece 55.
9 and 59 extend symmetrically, and the bumper stay 50 can be fixed to the flange 8 of the frame 6 by bolts and nuts (not shown) penetrating therethrough. As shown in FIG. 3 (D), both ends of the buffer 60 are inserted between the wide concave grooves 58, 58 in the hollow portion 56 of the main body 51, and the longitudinal direction of the buffer 60 is It is arranged along. As shown in FIG. 3 (E), the buffer body 60 is obtained by cutting an extruded shape having a main body 62 having a square cross section and four hollow portions 64 arranged in a cross-shape at a required length. is there. The shock absorber 60 has a hollow portion 56 of the main body 51 with the cross-sectional shape shown in FIG.
Is placed within. In addition, the buffer body 60 is also shown in FIG.
Buckling deformation similar to that of the buffer body 20 shown in (B) is possible, and a portion along the longitudinal direction of each hollow portion 64 corresponds to the buffer body 20.

According to the bump pasty 50 described above, by providing the buffer body 60 having a larger cross-sectional area, more energy can be reliably absorbed at the time of collision. Further, instead of the buffer body 60, a buffer body 66 shown in FIG. The buffer 66 is formed by cutting an extruded member having a rectangular cross section main body 68 and a total of six hollow portions 70 of 2 × 3 in length and width into a required length. This buffer 66 is inserted into the concave groove 5 in the hollow portion 36 of the main body 51.
By arranging them between 8, 58, even more energy can be reliably absorbed. FIG.
As shown in (G), a buffer body 72 having a substantially cross-sectional shape including a vertical portion 74, a horizontal portion 76, and an intersecting portion 75, and having a total of five hollow portions 78 each of three in length and width is used. Is also possible. Even if the bumpers 60, 66, 72 are inserted between the concave grooves 58, 58 in the main body 51 and the projected ridges 57 exposed above and below are short or almost non-existent, screws or pins are screwed in the same manner as described above. By doing so, the buffer body 60 and the like can be positioned.

FIG. 3H is a plan view of a modified bump pasty 50 ′. Bump Pastay 5
0 'is the main body 51' and the hollow 5 as shown in FIG.
6 and a pair of shock-absorbing bodies 40 arranged in the inside. Body 5
Reference numeral 1 'is a cross section of the same extruded section cut at a predetermined width orthogonal to the extrusion direction. The front end wall 52c has a curved shape following the shape of the bumper 1, the rear end wall 55 of the frame 6 and the vehicle body. A pair of side walls 53 and 54 extending in the front-rear direction are integrally provided. Two pairs of convex ridges 57 and a pair of concave grooves 58 sandwiched therebetween are formed on the front and rear end walls 52c and 55 in the hollow portion 56 so as to face each other. In addition, the tip wall 52b
In addition, a pair of thick portions 52b are additionally provided to make each groove 58 face each groove 58 of the rear end wall 55.

Further, flanges 5 are provided on both sides of the rear end piece 55.
9, 59 extend symmetrically. As shown in FIG. 3 (H), in the hollow portion 56 of the main body 51, between the pair of concave grooves 58, 58 facing each other on the left and right, the long and short buffers 4.
When both ends of 0 and 40 are individually inserted, each buffer body 40 is arranged along its longitudinal direction along the front-back direction of the vehicle body. As described above, the pair of shock absorbers 40 extends in the longitudinal direction of the vehicle body.
Are arranged in parallel, the buckling deformation of the cushions 40, 40 arranged in parallel makes it possible to reliably absorb even more collision energy.

FIG. 4 shows a further different shape of the buffer 80,
86,88. FIG. 4 (A) shows an end face of a buffer body 80 made of the same extruded aluminum alloy as described above and having a circular section and a hollow portion 81. When the shock absorber 80 receives an impact load along the longitudinal direction in the same manner as described above, FIG.
As shown in (a), three convex portions 83 protruding symmetrically outward and three concave portions 84 concave toward the hollow portion 81 are formed alternately, and the convex portions 83 are formed along the longitudinal direction. The concave portions 84 are alternately formed, and the buffer body 82 is buckled and deformed in a bellows shape.

FIG. 4B also shows a buffer 86 made of the same extruded profile as described above and having a hexagonal cross section and a hollow portion 87.
2 shows an end face of the slab. Further, FIG. 4 (C) also shows a cushioning member 8 made of the same extruded profile as described above, having a regular octagonal cross section and having a hollow portion 89.
8 shows an end face. When they receive an impact load along the longitudinal direction, they also buckle and deform so as to be folded in a bellows shape along the longitudinal direction, similarly to the buffer body 82 described above. The buffer members 80, 86, and 88 described above are also used for bump pasties in combination with the main body 11 and the like, so that collision energy can be efficiently absorbed and occupant safety can be achieved.

FIG. 5A shows a bump pasty 10 'which is an application of the above bump pasty 10. As shown in FIG. Bump pasty 10 '
As shown in FIG. 5A, a cover plate 90 is fixed to both end surfaces of the hollow portion 16 of the main body 11 in which the buffer body 20 is arranged. At four corners of the hollow portion 16 of the main body 11, screw holes 92 are integrally provided in advance. As shown in FIG. 5B, the cover plate 90 is fixed to the main body 11 by individually screwing the self-tapping screws 94 into the screw holes 92 from the through holes 91 provided at the four corners. According to the bump pasty 10 ′, since the rigidity of the main body 11 is improved by the respective cover plates 90, the energy required for deformation of the main body 11 increases, and in combination with the buckling deformation of the cushioning body 20, more energy is applied at the time of collision. Can be reliably absorbed. Thereby, the impact force applied to the frame or the vehicle body at the time of the collision is reduced, and the safety of the occupant can be further improved.

FIG. 5C shows the hollow portion 16 of the main body 11.
The bumper stay 10 "in which the self-tapping screw 94 is screwed into the screw hole 92 through the through holes 98 at the four corners of the cover plate 96 is shown only at the position near the frame on the end face of the bumper stay 10".
A screw hole 92 for receiving a screw 94 that enters from a through hole 98 on the bumper side of No. 6 is provided in advance between the side walls 13 and 14 of the main body. According to the bump pasty 10 ″,
Due to the cover plate 96 fixed to the frame, in the event of a collision, the main body 11 buckles at the portion near the bumper without the cover plate 96 first, whereby the collision energy is absorbed as the first stage, and then the cover plate 96 is provided. The portion near the frame starts to buckle due to a larger load, and as a second stage, a larger collision energy is absorbed. Accordingly, it is possible to control the impact force generated on the frame side due to the difference in the degree of collision, and it is possible to obtain the same operation and effect as the bump pasty 10 '.

The cover plates 90 and 96 are attached to the main body 1.
It is also possible to form a channel having a flat cross section by bending both edges on the side walls 13, 14 and the like such as 1 and to fix the folded edge by blind rivet. Alternatively, when the lid plates 90 and 96 are aluminum alloy plates, they can be fixed to the main bodies 11 and 51 by welding. However, in this case, a necessary heat treatment is appropriately performed after the welding. Furthermore, even if the cover plates 90 and 96 are fixed to only one end face of the hollow portion 16 of the main body 11, the amount of collision energy absorption can be controlled.

The present invention is not limited to the embodiments described above. For example, the buffer 20 and the like are arranged along the front-rear direction of the vehicle body, but the end near the frame may be slightly inclined toward the center of the vehicle body. As a result, the portion of the bump pasty near the bumper is deformed toward the center of the vehicle body due to the collision, so that the entire cross section of the buffer body 20 and the like can be brought closer to the coaxial center. In particular, in the configuration in which the pair of shock absorbers 40 shown in FIG. 3 (H) are arranged in parallel, if the shock absorber 40 on the center side of the vehicle body is arranged to be inclined as described above, the load from various directions at the time of collision can be reduced. Can be effectively absorbed.

Further, in order to form the concave groove 18 or the like for receiving the end portion of the buffer body 20 or the like, the present invention is not limited to the form in which the pair of ridges 17 are protruded, and the front and rear end walls 12 and Fifteen
The groove 18 or the like may be formed directly on the substrate. Furthermore, a pair of flanges may be provided symmetrically on both sides of the tip wall 12 and the like of the bump pasty 10 and the like, and the bump pasty 10 and the like may be fixed to the bumper reinforcement 2 of the bumper 1 via the flanges. Although the bump pasty of the present invention is used for bumpers before and after a car, it can be used, for example, as a member for supporting a skirt of a railway car.

[0038]

According to the bump pasty of the present invention described above, the shock absorbers are arranged in bellows sequentially from the portion closer to the bumper or the frame to the opposite side due to the load due to the collision energy when the vehicle collides with another vehicle or the like. At the same time as the buckling deformation, the main body of the bump pasty also gradually deforms in accordance with the buckling deformation of the shock absorber. Therefore, the buckling deformation allows more and more energy to be absorbed at the time of the collision without transmitting a large impact force to the frame side, so that the safety of the occupant can be improved. According to the bumper stay of the third aspect, only by inserting the end of the buffer having a required length into the concave groove in the hollow portion of the main body, the buffer is moved along the substantially front-rear direction of the vehicle body. Can be easily arranged.

Furthermore, according to the bump pasty of claim 4,
Since the rigidity of the main body can be increased, more energy can be reliably and reliably absorbed at the time of the collision in combination with the bellows-like buckling deformation of the shock absorber. In addition, when the cover plate is fixed only near the frame, the collision energy can be absorbed in two stages. In addition, according to the bump pasty of claim 5, in addition to the above effects, the cover plate can be easily fixed to the end face in the hollow portion of the main body by self-tapping screws or bolts, and both the grinding and the grinding can be manufactured in a small number of steps. It is also possible to do.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a state where a bump pasty of the present invention is arranged between a bumper and a frame, and FIGS. 1B and 1C.
3 is a perspective view or a partially cutaway perspective view of the bump past shown in FIG.

2 (A) and 2 (B) are perspective views showing a state before and after deformation of the buffer shown in FIGS. 1 (B) and 1 (C), and FIG. 2 (a) shows an end of the buffer shown in FIG. FIGS. 1C and 1D are schematic cross-sectional views showing a deformed portion provided, and FIGS.

3 (A) is a plan view showing a bump pasty of a different form, FIGS. 3 (B) and 3 (C) are cross-sectional views of a shock absorber used for the same, FIG. 3 (D) is a plan view showing a bump pasty of a further different form, FIG. ) ~
(G) is a cross-sectional view of the shock absorber used for this, and (H) is a plan view showing a modification of the bump pasty of (D).

4 (A) to 4 (C) are end views showing another form of the buffer.
(a) is an end view after deformation | transformation of the buffer of (A).

5A is a perspective view showing an application form of the bump pasty of FIG. 1, FIG. 5B is a vertical sectional view of the bump pasty of FIG. 1A, and FIG. 5C is a vertical sectional view of a bump pasty of a different form.

6A is a schematic view showing a general arrangement of bump pasties, and FIGS. 6B and 6C are cross-sectional views of a conventional bump pasty.

[Explanation of symbols]

1 ………………………………… Bumper 6 ………………………………………… Frame 10, 10 ', 10 ", 30,50,50' ... Bump pasty 11,31,51,51 '............... Body 16,36,56 ............... ... hollow section 18, 38, 58 ... groove ... 20, 40, 44, 60, 66, 72, 80, 86, 88 buffer member 90 , 96 ……………………………………………………………………………………………………… 92 ……………………… Self-tapping screws

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Sasamoto 1-34-1 Kambara, Kambara-cho, Abara-gun, Shizuoka Prefecture Inside Nippon Light Metal Co., Ltd. Group Technology Center 1-334-1 Nippon Light Metal Co., Ltd. Group Technology Center F term (reference) 3J066 AA02 BA03 BB01 BC01 BD07 BE01 BF04 BG01

Claims (5)

[Claims] 1. A body having a required length, which is formed of an extruded aluminum alloy material, has a hollow portion, and is disposed between a bumper and a frame such that the direction of the extrusion is orthogonal to the front-rear direction of the vehicle body. A bumper stay disposed substantially along the front-rear direction of the vehicle body in the hollow portion of the main body, and absorbing energy by buckling and deforming in a bellows shape along the direction. 2. An aluminum alloy of a required length having one or a plurality of hollow sections having a square or rectangular cross section or a hollow section having a circular cross section or a polygonal cross section having four or more even-numbered sides. The bump pasty according to claim 1, comprising an extruded profile of: 3. The bump pasty according to claim 1, wherein a concave groove for receiving an end of the buffer is formed in a hollow portion of the main body. 4. The bump pasty according to claim 1, wherein a cover plate is fixed to the entire end surface of the hollow portion of the main body or to a position near the frame. 5. The bump pasty according to claim 4, wherein a screw hole for receiving a screw or the like penetrating the cover plate is additionally provided in a hollow portion of the main body.