JP2002012104A - 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: In this bumper stay 10 made from aluminum alloy extruded structural angle having hollow sections 15 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, an oblique side 11 on the side of the bumper 1 in the structural angle is made longer than the end side 14 on the side of the frame 6 and at least overhangs near the center in the cross 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 a structural member on the vehicle body side such as a side frame to which a bumper is attached via a bump pasty.

[0002]

2. Description of the Related Art As shown in FIG.
0 is disposed between the bumper 52 and the frame 56 at the front 50 of the vehicle,
4 and a flange 58 of the frame 56, which are fixed by bolts or the like (not shown). As shown in FIG. 7 (B), a conventional bump pasty 60 is formed by cutting an extruded section of an aluminum alloy into a predetermined width orthogonal to the extrusion direction, and has a narrow shock absorbing step 61 near the bumper 52. And frame 5
And a wide shock absorbing stage 62 closer to six. The shock absorbing stage 61 includes a rectangular piece 63 having a hollow portion 64 having a rectangular cross section.
The shock absorbing stage 62 has a rectangular cross section composed of a pair of long pieces 65, 67 and short pieces 66, 66, and has three hollow portions 69 provided inside by a pair of partition walls 68.

[0003] As shown in FIG. 7 (B), the bumper stay 60 is provided with a long piece 65 between the shock absorbing stages 61 and 62.
The distance between each connection position between the pair of partition walls 68 and the short piece 63 a of the shock absorbing step 61 is set to be three times or more the thickness of the long piece 65. As a result, the bumper stay 60 can move the short piece 63a, the partition wall 68, and the short piece 66 at the time of collision.
In this case, the crushing is started while the buckling deformation start time is shifted, so that the collision energy applied to the vehicle body side frame (not shown) is dispersed and absorbed in two stages (Japanese Unexamined Patent Application Publication No.
No. 58499).

[0004] A bump pasty 70 shown in FIG.
Also, the extruded profile of the aluminum alloy is cut into a predetermined width orthogonal to the extrusion direction, and the hollow portion 7 of the hollow portion 73 of the outer rectangular portion 72 near the frame-side long piece 76.
An inner rectangular portion 74 in which the inside 5 is provided is provided, and flanges 78 project symmetrically on both sides of the long piece 76. As shown in FIG. 7C, at the time of a collision, the bump pasty 70 first compresses and deforms rightward from the left side of the outer rectangular portion 72 to absorb the collision energy at the initial stage of the collision, and subsequently, the inner rectangular portion 74 Long piece 76 together with the outer rectangular portion 72
It compresses and deforms closer to absorb the second collision energy. By causing such two-stage deformation, the bump pasty 70 disperses and absorbs the collision energy in two stages, and alleviates the impact force applied to the frame (see Japanese Patent Application Laid-Open No. 7-277112).

[0005]

However, in the bump pasty 60, if a rightward force indicated by an arrow in FIG. 7B acts on the short piece 63a at the time of a collision, despite the complicated cross-sectional shape, the short piece 63a End 65a of long piece 65
Is deflected to the right with a small force, and the vicinity is subsequently
It is deformed as shown by the broken line in (B). Thereby, the short piece 63
Excessive bending stress is generated at the intersection of a and the end 65a of the long piece 65, and the end 65a is relatively easily deformed.
As a result, without sufficiently absorbing the energy at the time of the collision,
The shock absorbing step 61 near the bumper 52 is crushed. Further, the shock absorbing stage 62 near the frame 56 is in a state where buckling deformation or side-down deformation is easily caused by the deformation so far. Therefore, the above-mentioned bump pasty 60
Then, there was a problem that energy at the time of collision could not be sufficiently absorbed.

On the other hand, in the bump pasty 70, FIG.
As shown in (C), when a rightward force is applied to the short piece 72a of the outer rectangular portion 72, the outer rectangular portion 72 itself is overturned and deformed, so that the energy absorption in the first stage at the time of the collision is very low. Become smaller. Further, when the laterally rectangular deformation of the outer rectangular portion 72 proceeds, the short piece 72a and the short
Since a contacts with a, the lateral deformation of the inner rectangular portion 74 is induced. As a result, in the second stage at the time of the collision, side-down deformation occurs. Therefore, the bump pasty 70 has a problem that energy that can be absorbed is small. 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 capable of stably and reliably absorbing a large amount of collision energy at the time of a collision.

[0007]

In order to solve the above-mentioned problems, the present invention utilizes an extruded aluminum alloy material for a bump pasty and increases the length of the side of the bumper side on the bumper side so that the distance between the two can be improved. The present invention has been conceived in that the contact area is increased and the energy at the time of collision is widely received to stably absorb the energy. That is, the bump pasty of the present invention is formed of an extruded profile having a hollow portion of an aluminum alloy, and is disposed between the bumper and the frame so that the extrusion direction is orthogonal to the front-rear direction of the vehicle body. Is characterized in that the side on the bumper side is longer than the side on the frame side and projects at least toward the center in the width direction of the vehicle body. As a result, the contact area of the bumper with the bump pasty is increased, so that local concentrated stress is not generated in the bumper itself at the time of collision. As a result, damage to the vehicle body due to large deformation of the bumper itself can be suppressed.

Further, since the bump pasty is formed of an extruded material, the cross section of the bump pasty in which the bumper side is wider than the frame side can be freely formed. Furthermore, since the side on the bumper side protrudes toward the center in the width direction of the vehicle body, at the time of a collision, the side on the bumper side and the side side near the center in the width direction first become closer to the center of the vehicle body as the first stage. Bending deformation so as to fall down, the collision energy is absorbed by this deformation. By the time the bending deformation starts, the load generated by the collision is transmitted to the frame, and a primary peak of the collision load transmitted to the frame is generated when the deformation starts. Thereafter, when the collision energy is too large to be absorbed in the first stage, the outer side in the width direction of the vehicle body is buckled and deformed in the second stage, thereby absorbing more collision energy.
In this case, a secondary peak of the collision load occurs in the frame. In addition, the buckling deformation may be accompanied by the first stage bending deformation. Therefore, by the bump pasty, a lot of collision energy at the time of a collision can be absorbed gradually and efficiently and reliably, and the safety of the occupant can be improved.

Further, the hollow portion of the profile is partitioned into a pair in the width direction of the vehicle body by a partition side substantially parallel to the front-rear direction of the vehicle body, or intersects the partition side and the partition side and Also included are bump pasties that are partitioned into a substantially cross shape or a substantially T shape by a partition side substantially orthogonal to the front-rear direction of the vehicle body. According to this, the deformation of the bump pasty at the time of collision occurs in multiple stages due to the partition side provided in the hollow portion of the profile. This makes it possible to absorb the collision energy transmitted to the frame in multiple stages, increase the peak of the load applied to the frame, and reduce the impact force applied to the occupant. That is, as the first stage, the impact energy is absorbed by bending and deforming the side on the bumper side and the side near the center in the width direction of the vehicle body so as to fall down toward the center in the width direction. At this time, a primary peak of the load occurs in the frame. Next, as a second stage, the partition side provided substantially parallel to the front-rear direction of the vehicle body is buckled to absorb the collision energy, and a secondary peak of the load is generated in the frame. Further, as a third stage, the side near the side in the width direction of the vehicle body is buckled to absorb the collision energy, and a third peak of the load is generated in the frame.
Therefore, a large amount of energy can be absorbed by gradually absorbing the collision energy at the time of the collision. Thereby, the impact load generated on the frame side is reduced and dispersed.

[0010] Further, a cover plate is fixed to one end face or both ends in the extrusion direction of the extruded profile, and the cover plate is fixed to the entire end face or at a position close to the frame. Bump pasties are also included. According to this, the buckling strength of the bump pasty when receiving a load due to the collision energy is increased by the one end face or the cover plate fixed to both end faces, and the amount of deformation energy required for the buckling deformation is increased. In addition, in the form in which the cover plate is fixed only to the position near the frame in the bumper stay, the buckling strength on the bumper side is low, and the buckling strength on the frame side is high. However, buckling deformation occurs in two stages. For this reason, the impact force is dispersed and a large amount of energy can be absorbed.

As the buckling strength increases due to the fixing of the cover plate, the peak load applied to the frame immediately before and after the start of buckling increases, but the amount of energy absorbed also increases. This reduces the impact force on the occupant during a collision at a level where buckling deformation occurs in the bump pasty with the lid plate fixed. Therefore, according to the bump pasty,
A large amount of collision energy at the time of collision can be absorbed more reliably and efficiently. The cover plate can be easily fixed by integrally providing a screw hole in the hollow portion of the extruded member and screwing a screw or a bolt into the screw hole. Of course, the cover plate may be fixed to one or both end surfaces of the profile by welding.

[0012]

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1A shows a state in which bump pasties 10, 10 according to an embodiment of the present invention are arranged between both ends of a bumper 1 and frames 6, 6. The bumper 1 includes a bumper reinforcement 2 having a skin 3 on the outside, and bump pasties 10, 10 are arranged on side surfaces 5, 5 of both ends 4, 4, respectively. Also, frame 6
Has a hollow portion 7 having a rectangular cross section and a flange 8 at the tip. As shown in FIG. 1B, the bump pasty 10 is fixed to the reinforcement 2 of the bumper 1 by bolts or the like (not shown), and is fixed to the flange 8 of the frame 6 by bolts 18 and nuts 19. As a result, the bump pasty 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.

The bumper stay 10 is made of an aluminum alloy
(JIS: A6063, A6N01, A6061 etc., tempered T5 or T6) Extruded shape material cut at a predetermined width perpendicular to the extrusion direction. As shown in FIG. Has a predetermined length along the depth direction in the drawing. In addition, the bump pasty 10 includes an oblique side (side) 11 on the bumper 1 side, an end side (side) 14 on the frame 6 side, and a pair of side sides 12 connecting these left and right and oblique along the front-rear direction of the vehicle body. , 13 integrally, and the edge 14
Flanges 16 and 16 extend symmetrically on both sides, and are fixed to the flange 8 of the frame 6 by bolts 18 and nuts 19 penetrating therethrough. As shown in FIG. 1B, the length X in the width direction of the vehicle body of the oblique side 11 on the bumper 1 side
Is longer than the length Y of the end side 14 on the frame 6 side, and the oblique side 11 projects both to the center and the side of the vehicle body, and accordingly the right side 12 in FIG. The bumper 1 is formed so as to project toward the center of the vehicle body. For this reason, the contact area of the oblique side 11 in contact with the bumper 1 is larger than the end side 14 in contact with the frame 6. The side 13 on the side may be substantially parallel to the front-rear direction of the vehicle body.

When the vehicle collides with an intermediate portion of the bumper reinforcement 2 in the vehicle width direction, for example, when the vehicle collides with another vehicle,
As shown in FIG. 1 (A), bumper reinforcement 2
Of the load P ₀ to the intermediate portion acts, the bending moment M ₀ occurs each Banpasutei 10. Along with the deformation of the bumper reinforcement member 2 by the load P _0, and each Banpasutei 10 acts which draws in the P ₂ direction.
Therefore, as shown in FIG. 1 (B), the load P ₀ acting by the collision acts on the oblique side 11 and the side sides 12 and 13 of the bump pasty 10 via the bumper reinforcement 2. As a result, the vehicle body inboard sidewall 12 of work force indicated by the arrow P ₃ in FIG. 1 (B), the sides 12 are bent and deformed so as to fall down toward the center of the right vehicle width direction in the illustrated . Thereby, the collision energy is absorbed as the first stage. At this time, a peak load up to the maximum deformation load on the side 12 is applied to the frame 6.

Furthermore, the deformation progresses, the force indicated by the arrow P ₄ in FIG. 1 (B), the sides 13 of the side side is buckled and deformed. Due to this buckling, the collision energy is absorbed as the second stage. At this time, a peak load up to the buckling load acts on the frame 6, but a load exceeding the peak load does not occur, so that the impact applied to the occupant or the vehicle body is reduced. By using the bump pasty 10 that reliably generates the two-stage bending and buckling deformation as described above, a large amount of energy at the time of a collision can be efficiently absorbed, and occupant safety can be achieved.

FIG. 1C shows a cross section of a bump pasty 10 'which is an application of the bump pasty 10. As shown in FIG. Bump pasty 10 '
Also, as shown in FIG. 1C, the oblique side 11 on the bumper 1 side,
A pair of hollow portions is formed in the width direction of the vehicle body by forming an edge 14 on the side of the frame 6, a pair of side edges 12, 13, and flanges 16, 16 and forming a partition side 17 along the front-rear direction of the vehicle body. 15a and 15b are provided internally. Also in the bump pasty 10 ′, similarly to the above, the load accompanying the collision is caused by the oblique side 11, the side walls 12 and 13, and the partition side 1.
In the first stage, the side 12 is easily bent and deformed so as to fall toward the center of the vehicle body on the right side in the drawing, and the impact energy is absorbed as the first stage. A primary peak load corresponding to the load immediately before the start of the deformation is transmitted to the frame 6, but the collision energy is absorbed by the bending deformation.

When the deformation progresses, the second stage is performed and the partition side 1 is formed.
7 undergoes buckling deformation, and during this deformation process, impact energy is absorbed. Further, a secondary peak load corresponding to the load immediately before the start of the deformation is generated in the frame 6, and the collision energy is absorbed as the second stage. As the deformation further proceeds, the side 13 on the side is buckled and deformed as a third stage,
In this process, impact energy is absorbed. On the other hand, a tertiary peak load corresponding to the load immediately before the deformation starts is generated in the frame 6, and the collision energy is absorbed as the third stage. Therefore, the energy involved in the collision can be efficiently absorbed by the bump pasty 10 'in which the partition side 17 is further provided in the same manner as described above.

FIG. 1 (D) shows a bump pasty 10 "which is an application of the bump pasty 10 '. As shown in FIG. 1 (D), the bump pasty 10" also has an oblique side 11 on the side of the bumper 1 similarly to the above. It comprises a pair of side edges 12 and 13, an end edge 14 on the frame 6 side, and flanges 16 and 16. A partition 17b is disposed between the side edges 12 and 13 along the width direction of the vehicle body and at about 1/3 of a position close to the edge 14; By forming the partition side 17a along the direction into a substantially T-shape, the bumper 1
A wide hollow portion 15c closer to the frame and a pair of small hollow portions 15a and 15b narrower near the frame 6 are provided therein. The sides 12, 13 are divided into long portions 12a, 13a and short portions 12b, 13b by the partition side 17b.

In the same manner as described above, the bump pasty 10 "can also absorb the collision energy associated with the collision, and can absorb it in more stages than the bump pasty 10 '. That is, the frame-side portion of the bump pasty 10"
Existence of the partition side 17a and the long portion 12 of the side walls 12, 13
a, 13a and the short portions 12b, 13b,
By deforming as follows, the collision energy is absorbed in multiple stages. That is, the long part 12a is bent and deformed as the first stage,
As a second stage, the long portion 13a is buckled or deformed along with the buckling deformation. Further, as a third step, the short section 12
b undergoes buckling deformation together with the bending deformation, and the partitioning side 17a undergoes buckling deformation as the fourth stage, and then the short portion 13 as the fifth stage.
b is buckled and deformed. Since the collision energy is absorbed by the deformation energy required for these deformations, the shock generated on the frame 6 side is reduced. The deformation at each stage may occur continuously, or the order of the deformation may be changed depending on the state of the applied force.

FIG. 2A shows a different form of bump pasty 2.
0 shows a cross section. The bump pasty 20 is also obtained by cutting the same aluminum alloy extruded profile at a predetermined width orthogonal to the extrusion direction, and as shown in FIG. 2A, the oblique side (side) 21 on the bumper side. , A pair of side edges 22 and 23, a frame-side end (side) 24, and a pair of flanges 29. Since the oblique side 21 is longer than the end piece 24, the contact area of the oblique side 21 in contact with the bumper is the end side 2 in contact with the frame.
4 is larger than the contact area. In addition, a partition side 27 along the width direction of the vehicle body between the side sides 22 and 23 and a partition side 28 along the front-rear direction of the vehicle body between the oblique side 21 and the end side 24 are formed in a substantially cross shape. Thus, hollow portions 25a and 25b slightly wider near the bumper and hollow portions 25c and 25d slightly narrower near the frame are provided.

When another vehicle or the like collides with the bump pasty 20, the load P accompanying the collision passes through the bump reinforcement 2 in FIG. And the partition side 28. At this time, as shown by arrows in FIG. 2 (A), the oblique side 21, the side side 22, and the partition side 28 are easily bent and deformed so as to fall down toward the center of the right vehicle body as a first stage, The collision energy is absorbed. As the deformation progresses,
In the second stage, the partition side 28 is buckled and deformed to absorb the collision energy, and by the subsequent load, the third side is buckled and deformed in the third stage to further absorb the collision energy. In these deformation processes, the first to third peak loads are generated in the frame to transmit the impact, but no impact load exceeding the peak value is generated in the frame.

By using the bump pasty 20 that reliably causes the three-stage deformation as described above, a large amount of energy at the time of collision can be efficiently absorbed. Also,
By arranging the partition sides 27 and 28 in a substantially cross-sectional shape, the hollow portions 25a and 25b slightly wider near the bumper and the hollow portions 25c and 25d slightly narrower near the frame are internally provided. Can be enhanced. Therefore, the amount of energy that can be absorbed increases, and more energy can be absorbed in three stages.

FIG. 2B shows a cross section of a bump pasty 20 ′ which is an application of the above bump pasty 20. FIG. 2 (B)
As shown in the figure, the bump pasty 20 'also includes a diagonal side 21 on the bumper side, a pair of side sides 22, 23, an end side 24 on the frame side, and flanges 29, 29 in the same manner as described above. A partition side 27 is formed between the side sides 22 and 23 along the width direction of the vehicle body, and a partition side 28a is formed between the partition side 27 and the oblique side 21 along the front and rear direction of the vehicle body. Side 27
A partitioning side 28b is formed between the edge 24 and the frame 24, the portion closer to the frame being inclined toward the center of the vehicle body. Thus, the hollow portions 25a and 25b slightly wider than the bumper are provided.
And hollow portions 25c and 25d slightly narrower near the frame are provided therein.

The bump pasty 20 'can also absorb the collision energy due to the deformation in a plurality of stages and suppress the peak value of the impact load generated on the frame to a certain limit. Similarly to the above, the load P accompanying the collision is transmitted to the oblique side 21, the side sides 22, 23, and the partition side 28a, as shown in FIG. It is easily bent and deformed so as to fall toward the center of the vehicle body, and the collision energy is absorbed. At this time, the partition side 28b close to the frame is deformed along the front-rear direction of the vehicle body and resists deformation of the bump-side stay 20 'near the frame. As the deformation progresses, the portion of the side 22 near the frame and the partition 28b buckle, and the collision energy is absorbed in the process. Since the partition side 28b is substantially parallel to the direction of the load, its buckling load increases, and a large amount of collision energy can be absorbed. Therefore, the partition sides 27 and 2
According to the bump pasty 20 'having the bumps 8a and 28b, the collision energy can be more efficiently and reliably absorbed. Moreover, the four hollow portions 2 are formed by the partitions 27, 28a and 28b.
Since bumps 5a to 25d are formed, bump pasty 2
0 'stiffness can be further improved, and bump paste 2
Even if the cross-sectional area of 0 'itself is small, it is possible to absorb much collision energy.

FIG. 3A also shows a cross section of a bump pasty 30 which is an application of the bump pasty 20. The bump pasty 30 is also obtained by cutting an aluminum alloy extruded section similar to the above at a predetermined width orthogonal to the extrusion direction,
As shown in FIG. 3 (A), it is composed of an oblique side (side) 31 on the bumper side, a pair of side sides 32 and 33, an end side (side) 34 on the frame side, and a pair of flanges 39. The oblique side 31 is longer than the end side 34 and projects toward the center in the width direction of the vehicle body. Further, the contact area of the oblique side 31 in contact with the bumper is larger than the end side 34 in contact with the frame. Further, the oblique side 31 has a larger inclination angle than the above-described embodiments, and accordingly, the side 32 closer to the center of the vehicle body is longer and the side 33 closer to the side of the vehicle body is shorter. Further, the bump pasty 30 includes a partition side 36 between the side sides 32 and 33 along the width direction of the vehicle body, and a partition side 37 between the partition side 36 and the oblique side 31 along the front and rear direction of the vehicle body,
A partition side 38 between the partition side 36 and the end side 34 and a portion closer to the frame and inclined toward the center of the vehicle body is formed in a substantially cross shape. With these, bump pasty 30
Are wider hollow portions 35b and 35c and narrower hollow portions 35b.
a and 35d.

When a collision occurs in the bump pasty 30, in FIG. 3A, the load P caused by the collision passes through the bumper reinforcement 2 and passes through the oblique side 31, side sides 32 and 33, and the partition side of the bump pasty 30. 37. As a result, as shown in FIG. 3B, the oblique side 31 and the side 32 are easily bent and deformed so as to fall toward the center of the right vehicle body, and the partitioning side 37 is also buckled and deformed.
The collision energy is absorbed. As a result, a primary peak is generated with an impact load applied to the frame, but a large impact load exceeding this is not applied to the frame.

Since the collision energy generated by the collision is large, when the deformation further proceeds, as shown in FIG.
The portion of the side 32 near the frame and the partition side 38 are buckled and deformed, and in these processes, the collision energy is further absorbed. Accordingly, a secondary peak load, which is a larger impact load, is generated in the frame. However, the impact load generated on the frame does not exceed the secondary peak load until the entire bump pasty 30 is crushed. By using the bump pasty 30 that reliably generates the deformation in two stages as described above, a large amount of energy at the time of collision can be more efficiently absorbed. Moreover, the partition sides 36 to 38
Are arranged in a substantially cross-sectional shape so that the hollow portions 35a and 35b closer to the bumper and the hollow portions 35c and 35c closer to the frame are arranged.
Since the bumper stays 35d are provided internally, the rigidity of the bumper stays 30 can be further increased, and much collision energy can be absorbed even with a small cross-sectional area. In addition, the two-stage deformation can be more reliably generated.

[0028]

Now, a specific embodiment of the present invention will be described. FIG. 4A shows an aluminum alloy (JIS: A6N0).
1-Temperature T5) An extruded shape member having a thickness of 6 mm, a diagonal side 31, side sides 32 and 33, an end side 34, and a pair of flanges 39, and a hollow without the partition sides 36 to 38. The end view of the bump pasty 30a which has the part 35 is shown.
In FIG. 4A, the height in the vertical direction is H1 at the right end of the oblique side 31.
Is 80 mm, H2 at the left end is 32 mm, and FIG.
In (A), the width in the left-right direction is W1 between the left and right ends of the oblique side 31.
Is 173 mm, and W2 between both ends of the flanges 39 and 39 is 1
40 mm. Also, the length (cutout length) of the bump pasty 30a in FIG. 4A along the depth (extrusion) direction.
Is 100 mm. FIG. 4 (D) shows the same aluminum alloy profile as above, each side 31-34 and flange 39 also having the same thickness as above, and hollow portions 35a on both sides of a partition side 37 along the longitudinal direction of the vehicle body. , 35b shows the end face of the bump pasty 30b. In FIG. 4D, the length of each part in the vertical and horizontal directions is the same as that of the bump pasty 30a.

The bump pasties 30a and 30b are used in the first embodiment.
2 and these were individually fixed under the same conditions.
As shown in (D), a weight (load) P having a weight of 100 kgf was caused to collide at a speed of 40 km / hr, and each deformation transition was examined. The bump pasty 30a of the first embodiment is shown in FIG.
As shown in the end view of (C), two-stage deformation of bending deformation of the side 32 and buckling deformation of the side 33 is shown. On the other hand, the bump pasty 30b according to the second embodiment is similar to the bump pasty 30b shown in FIGS.
As shown in the end view of FIG.
7 and buckling deformation of the side 33 are shown in three stages. In the above deformation process, the first embodiment
FIG. 5 is a graph showing the transition of the amount of displacement of the vehicle body in the front-rear direction and the load applied to the portion corresponding to the frame in FIG.

Example 1 shown by a dashed line in the graph of FIG.
Indicates a primary peak load corresponding to the bending deformation of the side 32, and then indicates a secondary peak load corresponding to the buckling deformation of the side 33. On the other hand, Example 2 shown by the solid line is
After showing the secondary and secondary peak loads, the tertiary peak load was further shown. The secondary peak load in the second embodiment is due to the buckling deformation of the partition side 37. Further, the solid line of Example 2 showed a higher load value overall than the one-dot chain line of Example 1.
Further, the area between the one-dot chain line or the solid line and the horizontal axis in the first and second embodiments corresponds to the collision energy absorbed by the bump pasties 30a and 30b in each example. As a result, Example 2 is replaced with Example 1
It was found that more collision energy was absorbed, and the effect of the provision of the partition side 37 was confirmed. And FIG.
From the behavior of each example in the graph of, a large number of collision energies can be absorbed by generating a few steps of deformation.
It is understood that the effect of the present invention is also supported.

FIGS. 6A and 6B show the bump pasty 10 shown in FIG.
Shows a bump pasty 10a, which is a further different application form. This bump pasty 10a is also made of the same extruded material as described above, and has an oblique side 11 on the bumper side, an end side 1 on the frame side
4, a pair of side edges 12, 13; a pair of flanges 16; and a hollow portion 15, and each flange 16 is provided with a through hole 16a for the bolt 18. As shown in FIG. 4B, trapezoidal lid plates 40, 40 covering the hollow portion 15 are formed by welding W at both ends of the hollow portion 15, that is, at positions near the frame at the openings at both ends in the extrusion direction. Fixed. The cover plate 40 is also made of an aluminum alloy plate, and is subjected to necessary heat treatment after welding. Further, the cover plate 40 may be fixed to only one end face of the stay 10a.

According to the bump pasty 10a, the load caused by the collision is transmitted to the oblique side 11, the side sides 12 and 13 in the same manner as described above.
13 is easily bent and deformed so as to fall toward the center of the vehicle body, thereby absorbing collision energy. Along with this, a primary peak load is generated as an impact load on the frame, but a load exceeding this does not occur. Collision energy is first
If it is too large to be absorbed at the stage,
The portion near the frame a is buckled and deformed. Since a pair of cover plates 40 are fixed to this portion, the buckling load of the portion increases. For this reason, a large amount of collision energy is absorbed when buckling deformation of the bumper stay 10a near the frame including the cover plate 40. At this time, a secondary peak load is generated as an impact load on the frame. Therefore, according to the bump pasty 10a in which the pair of cover plates 40 is fixed near the frame, the energy associated with the collision can be more efficiently absorbed.

FIG. 4C shows an end face of an extruded section 10b of a different form used for the bump pasty 10a. This profile 1
0b also has a slanted side 11, an end side 14, a pair of side sides 12, 13, a pair of flanges 16, and a hollow portion 15 as described above, and as shown in FIG. A pair of screw holes 42 and 44 are provided in the middle of the sides 12 and 13 and both ends of the end side 14. Therefore, when fixing the pair of cover plates 40 at positions near the frame at both ends of the hollow portion 15, self-tapping bolts (not shown) are screwed into the screw holes 42 and 44 from through holes provided in advance in each cover plate 40. Thereby, the pair of cover plates 40 can be easily fixed. In this case, the cover plate 40 may be fixed to only one end face of the profile 10b. Further, a steel plate or the like can be used for the cover plate 40.

The present invention is not limited to the embodiments described above. For example, the bump past 1
0, 20, 30, etc., the side 1 on the side of the vehicle body
3, 23, 33 may be formed parallel to the front-rear direction of the vehicle body. In the bump pasties 10, 20, 30, etc., the sides on the side of the bumper 1 are the oblique sides 11, 21, 31, but may be curved sides having a curve in accordance with the shape of the bumper reinforcement 2. it can. Furthermore,
A pair of flanges following the shape of the bumper reinforcement 2 may be protrudingly provided on both left and right ends of the oblique sides 11, 21, 31 which are sides on the bumper 1 side. Although the bump pasty of the present invention is used for bumpers before and after a car, it can be applied to, for example, a member supporting a skirt of a railway car.

[0035]

According to the bump pasty of the present invention described above, the cross-sectional shape in which the bumper side is wider than the frame side can be freely formed by the extruded material. In addition, at the time of a collision, the side that first protrudes toward the center in the width direction of the vehicle body is bent and deformed so as to fall down toward the center of the vehicle body, and after absorbing the collision energy as the first stage, By buckling deforming the outer side in the width direction toward the center, it is possible to absorb the collision energy as the second stage. Therefore, such bump pasty can gradually and efficiently absorb a large amount of energy at the time of a collision, and can improve the safety of the passenger.

According to a second aspect of the present invention,
In addition to the above, it is possible to cause multi-stage deformation and to absorb more collision energy without providing a special structure for the bump pasty only by providing the partition side. Furthermore, according to the bump pasty of claim 3, in addition to the above, as a first stage at the time of a collision, it acts on the bumper having no cover plate on both end surfaces to buckle and deform it.
In addition to absorbing the collision energy, if the collision energy is large and cannot be absorbed in the first stage, the second stage is to buckle and deform the portion near the frame having the lid plate on one end surface or both end surfaces, and furthermore, Many collision energies can be absorbed. Therefore, it is possible to more efficiently absorb a large amount of collision energy at the time of collision, and reduce the impact load applied to the frame.

[Brief description of the drawings]

1A is a perspective view showing a state in which a bump pasty of the present invention is arranged between a bumper and a frame, FIG. 1B is an enlarged sectional view near the bump pasty shown in FIG. 1A, and FIGS. D) is a sectional view showing a bump pasty of the applied form.

FIGS. 2A and 2B are cross-sectional views showing bump pasties in different application forms.

FIG. 3A is a cross-sectional view showing a further different form of bump pasty, and FIGS. 3B and 3C are schematic cross-sectional views showing a deformed state of the bump pasty shown in FIG.

4 (A) and 4 (D) are end views showing modifications of the bump pasty shown in FIG. 3, and FIGS. 4 (B), 4 (C) and 4 (E) to 5 (G) are end views showing these deformation processes.

5 is a graph showing a relationship between a load and a displacement amount in each bump pasty shown in FIG. 4 in FIG.

6A is a perspective view showing a different application form of the bump pasty shown in FIG. 1A, FIG. 6B is a cross-sectional view taken along line BB in FIG. 1A, and FIG. FIG. 6 is an end view showing an extruded shape member according to the application form of FIG.

FIG. 7A is a schematic view showing the arrangement of a general bump pasty, and FIGS. 7B and 7C are cross-sectional views of a conventional bump pasty.

[Explanation of symbols]

1 …………………………………………………
……… Bumper 6 …………………………………………………
............ Frames 10, 10 ', 10 ", 10a, 20, 20', 30, 30a,
30b… Bump pasty 10b …………………………………………………
……… Extruded profiles 11,21,31 …………………………………
Diagonal side (bumper side) 14, 24, 34 ..................................................
Ends (frame side) 15, 15a to 15c, 25a to 25d, 35a to 35d
……… Hollow part 17, 17a, 17b, 27, 28, 28a, 28b, 36 ~
38 Partition wall 40 ........................................................................
............ Lid plate

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 10, 2000 (2007.1.
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0029

[Correction method] Change

[Correction contents]

The bump pasties 30a and 30b are used in the first embodiment.
2 and these were individually fixed under the same conditions.
(D), the speed the weight of the weight 100 kgf 40k
Collision was performed at m / hr, an impact load P was applied , and each deformation transition was examined. As shown in the end views of FIGS. 4B and 4C, the bump pasty 30a according to the first embodiment shows two-stage deformation of bending deformation of the side 32 and buckling deformation of the side 33.
On the other hand, the bump pasty 30b of the second embodiment is different from that of FIG.
As shown in the end views of (E) to (G), three-stage deformations of bending deformation of the side 32, buckling deformation of the partition 37, and buckling deformation of the side 33 are shown. FIG. 5 is a graph showing the transition of the amount of displacement of the vehicle body in the front-rear direction and the load applied to the portion corresponding to the frame in the first and second embodiments in the above deformation process.

Continued on the front page (72) Inventor Takashi Sasamoto 1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture Within the Nippon Light Metal Co., Ltd. Group Technology Center (72) Inventor Harumichi Hino 1-34, Kambara, Kambara-cho, Abara-gun, Shizuoka No. 1 Nippon Light Metal Co., Ltd. Group Technology Center

Claims (3)

[Claims] An extruded member having a hollow portion of an aluminum alloy is disposed between a bumper and a frame so that an extruding direction is orthogonal to a front-rear direction of a vehicle body.
A bump pasty, wherein a side on the bumper side of the profile is longer than a side on the frame side and projects at least toward a center in the width direction of the vehicle body. 2. The hollow portion of the profile is partitioned into a pair in the width direction of the vehicle body by a partition side substantially parallel to the front-rear direction of the vehicle body, or intersects the partition side and the partition side and The bump pasty according to claim 1, wherein the partition is divided into a substantially cross shape or a substantially T shape by a partition side substantially orthogonal to the front-rear direction of the vehicle body. 3. A cover plate is fixed to one end surface or both end surfaces of the extruded profile in the extrusion direction, and the cover plate is fixed to the entire end surface or at a position close to a frame. The bump pasty according to claim 1 or 2, wherein: