JP2002012103A - Bump pasty - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a bump pasty that stably and reliably absorbs a lot of collision energy at the time of a collision. The extruded member is made of an aluminum alloy and has a hollow portion (12). The hollow portion (12) is disposed between a bumper (1) and a frame (6) so that the pushing direction is orthogonal to the front-rear direction of the vehicle body. A bump pasty 10 in which the side walls 14, 15 forming the portion 2 and extending in the front-rear direction of the vehicle body are made thinner near the bumper 1 and thicker as a thick portion 16 near the frame 6.

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 vehicle body-side structure to which a bumper is attached via a bumper stay such as a side frame.

[0002]

2. Description of the Related Art As shown in FIG.
0 is disposed between the bumper 72 and the frame 76 at the front 70 of the vehicle,
4 and a flange 78 of the frame 76, which are fixed by bolts or the like (not shown). As shown in FIG. 5 (B), the conventional bump pasty 80 is obtained 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 81 near the bumper 72. And frame 7
6 and a wider shock absorbing stage 82. The shock absorbing stage 81 includes a rectangular piece 83 having a hollow section 84 having a rectangular cross section.
The shock absorbing step 82 has a rectangular cross section composed of a pair of long pieces 85, 87 and short pieces 86, 86, and has three hollow portions 89b, 89a, 89 inside a pair of partition walls 88.
b is formed.

[0005] As shown in FIG. 5 (B), the bump pasty 80 corresponds to a long piece 85 between the shock absorbing steps 81 and 82.
The distance between each connection position between the pair of partition walls 88 and the short piece 83 a of the shock absorbing step 81 is set to be three times or more the thickness of the long piece 85. Accordingly, the bump pasty 80 is crushed at the time of collision while the buckling deformation start timing of the short piece 83a, the partition wall 88, and the short piece 86 is shifted.
It absorbs a large amount of collision energy without causing a large change and reduction in load (Japanese Patent Laid-Open No. 8-58-58).
499).

Further, a bump pasty 90 shown in FIG.
Also, the extruded profile of the aluminum alloy is cut to a predetermined width perpendicular to the extrusion direction, and the hollow portion 9 of the hollow portion 93 of the outer rectangular portion 92 is closer to the long piece 96 on the frame side.
An inner rectangular portion 94 in which the inside 5 is provided is also provided, and flanges 98 are symmetrically extended on both sides of the long piece 96. As shown in FIG. 5C, at the time of a collision, the bump pasty 90 first compresses and deforms rightward from the left side of the outer rectangular portion 92 to absorb the collision energy at the initial stage of the collision, and subsequently, the inner rectangular portion 94 Long piece 96 together with outer rectangular portion 92
It compresses and deforms closer to absorb the second collision energy. By causing such two-stage deformation, the bump pasty 90 attempts to absorb more energy generated at the time of collision (see Japanese Patent Application Laid-Open No. 7-277112).

[0005]

However, in the bump pasty 80, despite the complicated cross-sectional shape, the rightward force indicated by the arrow in FIG.
5B, the end 85a of the long piece 85 forming the hollow portion 89b is deformed as shown by the broken line in FIG.
3a is also deformed. For this reason, excessive bending stress is generated at the intersection between the short piece 83a and the end 85a of the long piece 85, and the intersection between the short piece 83a and the end 85a is broken or the short piece 83a is broken.
a itself buckles and deforms. As a result, the shock absorbing stage 81 near the bumper 72 is crushed without sufficiently absorbing the collision energy. Also, the shock absorbing stage 82 near the frame 76
Due to the deformation so far, buckling or side-down deformation is easily caused. Therefore, the bump pasty 80 described above has a problem that the energy at the time of collision cannot be sufficiently absorbed.

On the other hand, FIG.
As shown by the arrow in (C), when a rightward force is applied to the short piece 92a of the outer rectangular part 92, the short piece 92a of the outer rectangular part 92 has a longer rising length than the long piece 96 of the frame side.
The outer rectangular portion 92 itself may be deformed sideways or may easily buckle. For this reason, the energy absorption in the first stage at the time of the collision becomes very small. Further, when the side rectangular deformation of the outer rectangular portion 92 progresses, the short piece 92a and the inner rectangular portion 9
4 comes into contact with the short piece 94a, thereby causing the inner rectangular portion 94 to fall sideways. As a result, in the first stage and the second stage at the time of collision, side-down deformation occurs. Therefore, the bump pasty 90 has a problem that the energy that can be absorbed is small. Even when the short piece 92a of the outer rectangular portion 92 buckles, the second piece is formed in the same manner as described above except that the short piece 92a is successfully deformed outward.
There is a problem that the amount of energy absorption in the stage is reduced. 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]

In order to solve the above-mentioned problems, the present invention utilizes an aluminum alloy extruded shape,
Further, this is achieved by paying attention to changing the thickness in the cross section of the above-mentioned profile between the bumper and the frame. That is, the bump pasty of claim 1 is formed of an extruded aluminum alloy member and has one or more hollow portions, and is disposed between the bumper and the frame such that the extrusion direction is orthogonal to the front-rear direction of the vehicle body. In addition, the side wall or the side wall and the partition wall which form the hollow portion and extend in the front-rear direction of the vehicle body are made thinner near the bumper and thicker near the frame.

[0008] According to this, by making the side wall and the partition wall closer to the bumper and making the frame closer to a thicker wall, the thinner bumper is first buckled and deformed at the time of a collision. After absorbing the collision energy as a stage, the thicker frame can be buckled and deformed to absorb the collision energy as a second stage. Therefore,
Such bump pasties can absorb the energy at the time of the collision in two stages. That is, it is possible to absorb the collision energy without transmitting the load greater than the buckling load of the thick portion in the first stage and not transmitting the load greater than the buckling load of the thick portion to the frame as the impact load in the second stage. And surely 2
Since the collision energy is absorbed in stages, the safety of the occupant can be improved, and in the case of a small collision, the repair can be performed only by replacing the bumper stay or only by replacing the bumper with the bumper stay. It is natural that the second stage cannot completely absorb the collision energy that is more than the energy that can be absorbed.

According to a second aspect of the present invention, a partition wall is formed in the hollow portion, the partition wall being substantially perpendicular to the front-rear direction of the vehicle body. Alternatively, the side wall and the partition wall are characterized in that the thickness is closer to the bumper and the thickness is closer to the frame in the front-rear direction of the vehicle body. According to this, the bumper of the bump pasty is surely deformed as the first stage at the beginning of the collision, and in the case of a collision that cannot be absorbed by this, a large amount of energy is absorbed in the portion near the frame as the second stage. While this is deformed, the collision energy can be efficiently and reliably absorbed.

Further, a bump pasty according to a third aspect of the present invention is formed of an extruded member made of an aluminum alloy and has one or more hollow portions, and the bumper and the frame are connected so that the pushing direction is orthogonal to the front-rear direction of the vehicle body. While being placed between,
A partition wall substantially perpendicular to the front-rear direction of the vehicle body is formed in the hollow portion, and a side wall or a side wall and a partition wall substantially along the front-rear direction of the vehicle body, which is divided into a portion closer to the bumper and a portion closer to the frame, are formed in the front-rear direction of the vehicle body. The length closer to the bumper is longer than the length closer to the frame. According to this, by increasing the length of the side wall or the partition wall near the bumper in the bump pasty, the buckling strength becomes smaller than that near the frame. Deform surely. In the case of a collision that cannot be absorbed by this deformation, the collision energy can be efficiently and reliably absorbed by deforming the portion near the frame while absorbing a large amount of energy as the second stage.

According to a fourth aspect of the present invention, there is provided a bumper stay that is made of an extruded aluminum alloy material and has a plurality of hollow portions along at least the front-rear direction of the vehicle body so that the extrusion direction is orthogonal to the front-rear direction of the vehicle body. The side wall or the side wall and the partition wall forming the hollow portion near the bumper are arranged between the bumper and the frame, and are parallel to the longitudinal direction of the vehicle body, and at least a part forming the hollow portion near the frame. , The side wall or the partition wall is inclined such that the position near the frame is directed toward the center of the vehicle body.

According to this, since the bump pasties are fixed on both the left and right sides of the bumper, the portion near the bumper is deformed as the first stage at the beginning of the collision, so that the collision energy is absorbed. At this time, the central portion of the bumper in the width direction of the vehicle body is slightly deformed, and accordingly, the bumper near the bumper is drawn toward the center in the vehicle width direction.
Therefore, as described above, the side wall and partition wall near the frame are
By inclining the position of the frame side toward the center of the vehicle body, the side walls and the partition walls near the frame are deformed along the front-back direction of the vehicle body. As a result, the strength of the side wall or the partition wall near the frame at the time of deformation does not decrease, and the deformation in the second stage occurs as deformation of the side wall near the frame and absorbs a larger collision energy than in the first stage. Therefore, the collision energy at the time of the collision can be efficiently and reliably absorbed by the bump pasty.
It is possible to improve the safety of the occupant.

Further, a bump pasty according to a fifth aspect is characterized in that a lid plate is fixed at a position close to a frame on one end surface or both end surfaces of the extruded profile in the extrusion direction. According to this, in conjunction with the bump pasty, the initial load at the time of the collision acts on one end surface or both end surfaces near the bumper without the cover plate to more reliably buckle and deform, and as a first stage, the collision energy Absorb. Subsequently, buckling deformation near the frame having a lid plate on one end surface or both end surfaces can be absorbed as a second stage in a larger energy than in the first stage.

This is because fixing the cover plate near the frame of the bump pasty increases the buckling strength of that portion. Therefore, the bump energy makes it possible to more efficiently and reliably absorb the collision energy at the time of the collision. Further, it is easy to change the buckling strength by changing the thickness or the material of the lid plate. The cover plate can be easily fixed by integrally providing a screw hole in the hollow portion of the extruded member and screwing or penetrating a screw or a bolt into the screw hole. Of course,
The lid plate may be fixed to one end face or both end faces of the profile by welding.

[0015]

Preferred embodiments of the present invention will be described below with reference to the drawings. 1 and 2 relate to bump pasties 10 to 20a of the present invention. FIG. 1A shows a state in which bump pasties 10, 10 according to the first 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 rear surfaces 5, 5 of both ends 4, 4, respectively. Further, the frame 6 has a hollow portion 7 having a rectangular cross section therein and a flange 8 at the tip. The bump pasty 10 is shown in FIG.
As shown in (B), reinforcement 2 of bumper 1
Are fixed to the flange 8 of the frame 6 by bolts and nuts 9. 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 T5
To T6) is cut at a predetermined width orthogonal to the extrusion direction, and as shown in FIG. 1 (B), a substantially trapezoidal main body 11 and a hollow portion 12 are formed. , Have a predetermined length in the depth direction in the drawing. As shown in FIG. 1 (B), the main body 11 includes a curved piece 13 on the bumper 1 side, an end piece 17 on the frame 6 side, and a pair of side walls 14 connecting the left and right thereof and extending in the front-rear direction of the vehicle body. In the hollow portion 12 of the side walls 14 and 15, a thick portion 16 is integrally provided near the frame 6. The end piece 17
The flanges 18, 18 extend symmetrically on both sides of the
The bump pasty 10 is fixed to the flange 8 of the frame 6 by bolts and nuts 9, 9 penetrating these.

When another vehicle or the like collides with the bumper 1, FIG.
In (B), the initial load accompanying the collision is transmitted to the bump pasty 10 via the bumper reinforcement 2 and transmitted to the frame 6 via the bump pasty 10. At this time, the first
As a step, the thin portions near the bumper in the curved piece 13 and the side walls 14 and 15 of the bump pasty 10 undergo buckling deformation with a relatively low buckling load. For this reason, the impact load generated near the bumper of the bump pasty 10 due to the collision is transmitted to the frame 6 up to the buckling load, and a primary peak load is generated. However, the buckling load or more is not transmitted to the frame 6 because the collision energy is absorbed by the buckling deformation.

In the case of a large collision, collision energy is further applied after the buckling deformation of the thin portion near the bumper is completed. The resulting impact load is transmitted to the frame 6 through the thick portion 16 near the frame of the bump pasty 10 as a second stage. At this time, the thick portion 16 near the frame is buckled and deformed by a relatively large buckling load. As a result, an impact load larger than that in the first stage is applied to the frame 6 to generate a secondary peak load. However, since a large amount of energy is absorbed by the buckling deformation of the thick portion 16, the impact generated in the frame 6 is reduced. The force can be reduced. By using the bump pasty 10 that surely generates the two-stage buckling deformation as described above, a large amount of collision energy 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 '
As shown in FIG. 1C, a curved piece 13 on the side of the bumper 1 of the main body 11, an end piece 17 on the side of the frame 6, a pair of side walls 14 and 15 connecting these left and right, and a pair of hollow portions 12
a, 12b are integrally formed. A thick portion 16 is integrally provided near the frame 6 of the side walls 14 and 15, and a thick portion 19 a is integrally provided near the frame 6 of the partition wall 19. The partition wall 19 also extends in the front-rear direction of the vehicle body, and flanges 18 extend on both left and right sides of the end piece 17.

In the bump pasty 10 'as well, the initial load accompanying the collision is transmitted to the thin portions of the side walls 14 and 15 near the bumper and the thin portions of the partition wall 19 near the bumper, as described above. Buckling deformation causes a primary peak load to be generated and collision energy to be absorbed. The subsequent load is applied to the thick portions 16, 1 of the side walls 14, 15 and the partition wall 19.
9a, and in the process of buckling deformation, a secondary peak load is generated and the collision energy is absorbed. Therefore, the bump energy 10 'in which the partition wall 19 having the thick portion 19a is further provided can efficiently absorb the collision energy as described above. In addition, since the hollow portions 12a and 12b are formed by the partition wall 19, the amount of collision energy absorption can be further increased, and buckling deformation can be reliably controlled.

FIG. 2A shows a different form of bump pasty 2.
0 shows a cross section. As shown in FIG. 2A, the bump pasty 20 has a substantially trapezoidal main body 21 and hollow portions 22a to 22d with a predetermined length in the depth direction in the drawing. The main body 21
The diagonal piece 23 on the bumper 1 side, the end piece 28 on the frame 6 side, a pair of side walls 24 connecting these left and right and along the front-back direction of the vehicle, and the partition wall 2 along the front-back direction of the vehicle body
5, 26, and the partition wall 2 which is orthogonal to the longitudinal direction of the vehicle body and
A partition wall 27 intersecting between 5 and 26 is integrally provided. The hollow portions 22a to 22d are formed by the partition walls 25, 26, and 27.
Is formed. Further, the partition wall 26 near the frame is thicker than the partition wall 25 near the bumper. Flanges 29, 29 extend symmetrically on both sides of the end piece 28, and the bumper stay 20 can be fixed to the flange 8 of the frame 6 by the bolts and nuts 9, 9 penetrating therethrough.

When another vehicle or the like collides with the bumper 1,
In FIG. 2A, the initial load accompanying the collision is as follows: the oblique piece 23 of the bump past 20, the side walls 24, 24 near the bumper,
And the thin walls are buckled and deformed with a relatively low load. In this first stage, the buckling load is transmitted to the frame 6 to generate a primary peak load, but the buckling deformation absorbs collision energy, so that the buckling load or more is not transmitted to the frame 6. In the case of a large collision, the subsequently transmitted impact load is applied to the side walls 24, 24 near the frame and the thick partition wall 2 in the second stage.
6, the partition wall 26 is buckled and deformed by a relatively large buckling load. In the second stage, a larger impact load is applied to the frame 6 than in the first stage, and a large impact load up to the buckling load of the thick partition wall 26 is generated. However, since much energy is absorbed by the buckling deformation of the partition wall 26, the impact force transmitted to the frame 6 does not increase any more. Even by using the bump pasty 20 that reliably generates such two-stage buckling deformation, a large amount of energy at the time of collision can be efficiently absorbed, and occupant safety can be achieved.

FIG. 2B shows a cross section of a bump pasty 20 ′ in an application form of the bump pasty 20. Bump pastie 20 '
As shown in FIG. 2 (B), a pair of diagonal pieces 23 on the side of the bumper 1 and end pieces 28 on the side of the frame 6 constituting the main body 21 are connected to each other, and a pair of the right and left sides is formed along the front-rear direction of the vehicle body. Side walls 24, 24, partition walls 25, 26 continuous along the longitudinal direction of the vehicle body, and partition wall 27 orthogonal to the longitudinal direction of the vehicle body
Are integrated. By such partition walls 25, 26, 27,
Hollow portions 22a to 22d are formed. Also, the side wall 2
In the portions close to the frame in 4 and 24, the portions close to the bumper are also thick portions 24a, 24a, and the partition wall 26 close to the frame is also thicker than the partition wall 25 close to the bumper. . It is apparent that the bump pasty 20 'can efficiently absorb the energy associated with the collision similarly to the bump pasty 20.

FIG. 2C shows a cross section of a bump pasty 20 "which is a modification of the bump pasties 20 and 20 '. As shown in FIG. 2C, the bump pasty 20" is located on the side of the bumper 1 constituting the main body 21 thereof. 23, end piece 2 on the frame 6 side
8, a pair of left and right side walls 24, 24a connecting the left and right and extending in the front-rear direction of the vehicle body, partition walls 25, 26a extending in the front-rear direction of the vehicle body, and a partition wall 27 orthogonal to the front-rear direction of the vehicle body. To have. Hollow portions 22a to 22d are formed by the partition walls 25, 26a, and 27. Further, the length of the vehicle body in the front-rear direction of the side wall 24 and the partition wall 25 near the bumper is longer than the side wall 24a and the partition wall 26a near the frame. Such side wall 24, partition wall 25 and side wall 24
a, two-step deformation similar to the above becomes possible due to the difference in length from the partition wall 26a. The above bump pasty 2
0 ″ (corresponding to claim 3), the bump pasty 2
As in the case of 0, 20 ', the collision energy can be efficiently absorbed.

FIG. 2D shows a cross section of a bump pasty 20a of a different modification of the bump pasties 20, 20 '. The bump pasty 20a has a main body 2 as shown in FIG.
The diagonal piece 23 on the bumper 1 side, the end piece 28 on the frame 6 side, a pair of side walls 24, 24 connecting these left and right and extending in the front-rear direction of the vehicle body, and a partition wall extending in the front-rear direction of the vehicle body constituting the vehicle 1. 25, 26b, and a partition wall 27 orthogonal to the front-rear direction of the vehicle body. Hollow portions 22a to 22d are formed by the partition walls 25, 26b, and 27. Also,
Hollow portions 22c and 22d are provided near the frame of each side wall 24.
The inside has a thick portion 24b having a tapered cross section, and a portion of the partition wall 26 close to the frame is also a thick portion 26b having both sides of the cross section tapered. It is apparent that the bump pasty 20a can efficiently absorb the energy associated with the collision similarly to the bump pasty 20.

FIG. 3 shows a further different form of the bump pasty 3.
0, 30 ', 40. The bump pasty 30 shown in FIG. 3 (A) is obtained by cutting an aluminum alloy extruded material into a predetermined width orthogonal to the extrusion direction. As shown in the drawing, a substantially trapezoidal main body 31 and a hollow portion 32a are formed. To 32d with a predetermined length in the depth direction in the figure. As shown in FIG. 3A, the main body 31 includes an oblique piece 33 on the bumper 1 side, an end piece 38 on the frame 6 side, and a pair of left and right side walls 34 and 34a along the front-rear direction of the vehicle body. The side wall 34a near the frame is thicker than the side wall 34 near the bumper.
Inside the main body 31, a partition wall 35 extending in the front-rear direction of the vehicle body,
A partition wall 36 which is located closer to the frame of the partition wall 35 and whose end piece 38 side is inclined toward the center of the vehicle body, is thicker than the partition wall 35, and a partition wall 37 which is orthogonal to the front-rear direction of the vehicle body.
Are integrally formed. Flanges 39, 39 extend symmetrically on both sides of the end piece 38, and the bumpers 30 can be fixed to the flange 8 of the frame 6 by the bolts and nuts 9, 9 penetrating therethrough.

When another vehicle or the like collides with the middle portion of the bumper 1 in the vehicle width direction, the initial load P accompanying the collision passes through the bumper reinforcement 2 in FIG. Acts on the oblique piece 33. Furthermore,
Due to the bending of the bumper 1 itself, the side walls 34 and the partition wall 35 near the bumper 1 are attached to the end of the oblique piece 33 of the bump pasty 30 near the center of the vehicle body in the direction of the arrow in FIG.
A pull Q is generated (toward the center of the vehicle body). Therefore, the inclined partition wall 36 is deformed along the front-rear direction of the vehicle body. As a result, each side wall 34 and the partition wall 35 near the bumper 1 are deformed so as to fall toward the center of the vehicle body along the arrow.

In the first stage, the thin side wall 34 and the partition wall 35 near the bumper 1 are first buckled and deformed by the collision load, so that the collision energy is absorbed. At the beginning of the subsequent second stage, the load Q in the vehicle body width (horizontal) direction also increases, and the inclined partition wall 36 is deformed in the direction along the front-rear direction of the vehicle body. In this state, the side wall 34a is inclined, but since the partition wall 36 extends in the front-rear direction of the vehicle body, the deformation is caused by buckling, and the buckling strength is also increased. When the load P applied in the second stage increases, a relatively large load is applied to the thick side wall 34a and the partition wall 36 near the frame. When the load P reaches the buckling limit, buckling as the second stage starts and large collision energy is absorbed. As described above, since the partition wall 36 extends along the front-rear direction of the vehicle body, a large amount of collision energy is absorbed in the process of buckling deformation of the partition wall 36 and the side wall 34a under a large load. By using the bump pasty 30 that reliably generates the two-stage deformation as described above, a large amount of collision energy can be efficiently absorbed, and the safety of the occupant can be improved.

FIG. 3B shows a cross section of a bump pasty 30 ′ in an application of the bump pasty 30. Bump pastie 30 '
As shown in FIG. 3B, the main body 31 includes an oblique piece 33 on the bumper 1 side, an end piece 38 on the frame 6 side, and a pair of left and right side walls 34 and 34a. Side wall 34 near the frame
“a” is thicker than the side wall 34 near the bumper. In the main body 31, a pair of parallel partition walls 35, 35 near the bumper 1 along the longitudinal direction of the vehicle body, and a pair of partition walls 36 located near the frame 6 and inclined toward the center of the vehicle body. , 36 and a partition wall 37 orthogonal to the front-rear direction of the vehicle body. The partition wall 36 near the frame 6 is thicker than the partition wall 35 near the bumper 1. The above-described partition walls 35, 36, 37 form six hollow portions 32a to 32f. Flanges 39, 39 extend symmetrically on both sides of the end piece 38.

Also in the above bump pasty 30 ', as shown in FIG. 3 (B), a pair of inclined partition walls 36 are moved in the longitudinal direction of the vehicle body by the force applied to the bump pasty 30' due to the collision as described above. Deforms to follow. The first
At the stage, the collision energy is absorbed as described above. In the subsequent second stage, the thick side wall 3 near the frame 6 is used.
Since the buckling deformation 4a and the partition wall 36 are surely buckled and the buckling limit load is increased, a large amount of collision energy is absorbed during the buckling deformation of these. Therefore, even with the bump pasty 30 'in which the pair of inclined thick partition walls 36 are provided, energy associated with the collision can be efficiently absorbed as described above.

FIG. 3C shows a cross section of a bump pasty 40 which is a modification of the bump pasty 30. Bump pasty 40
As shown in FIG. 3C, the main body 42 includes an oblique piece 43 on the bumper 1 side, an end piece 48 on the frame 6 side, left side walls 44 and 45, and right side walls 46 and 47.
The left side walls 44 and 45 extend in the front-rear direction of the vehicle body, and the side wall 45 near the frame 6 is thick. On the right side, the side wall 46 near the bumper 1 is parallel to the front-rear direction of the vehicle body, and the side wall 47 near the frame 6 is the side wall 46.
It is thicker and its end on the frame 6 side is inclined toward the center of the vehicle body.

In the main body 42, as shown in FIG. 3C, a partition wall 50 near the bumper 1 along the longitudinal direction of the vehicle body, the partition wall 50 being located near the frame 6 of the vehicle body, and A thick partition wall 52 inclined toward the center, a left partition wall 54 orthogonal to the longitudinal direction of the vehicle body, and a partition wall 56 located on the right side of the partition wall 54 and inclined toward the bumper 1 are integrally formed. I have. The partition wall 52 is inclined similarly to the side wall 47 near the frame 6. These partitions 50,
52, 54, 56, four hollow portions 58a to 58d
Are formed. On both sides of the end piece 58, flanges 59, 59 extend symmetrically. According to the bump pasty 40, it is possible to efficiently absorb the energy accompanying the collision, similarly to the bump pasty 30.

FIG. 4A shows an end face of an extruded aluminum alloy material 61 used for a bump pasty 60 described later. The shape member 61 includes a substantially trapezoidal main body 62 and a hollow portion 62a.
Have a predetermined length in the depth direction in the figure. FIG. 4 (A)
As shown in the figure, the main body 62 of the profile 61 has an oblique piece 63 on the bumper 1 side, an end piece 65 on the frame 6 side, and a pair of side walls 64 connecting these left and right and extending in the front-rear direction of the vehicle body. 64 are integrally provided. The portion of each side wall 64 closer to the frame is a thicker portion 64a which is thicker than the portion closer to the bumper. In the hollow portion 62a, screw holes 67, 68 each having a substantially C-shaped cross section are provided in the middle of each side wall 64 and both ends of the end piece 65.
Are provided integrally. Furthermore, on both sides of the end piece 65,
The flanges 66 extend symmetrically. The screw holes 67 and 68 may be of a pipe-shaped hollow type having a round cross section.

FIGS. 4B and 4C are a perspective view and a vertical sectional view of a bump pasty 60 using the above-described profile 61. FIG. As shown in FIGS. 4 (B) and 4 (C), the bumper stays 60 have cover plates 69, 69 at positions near the frame on both end surfaces of the hollow portion 62a of the profile 61 and covering the thick portions 64a. It is fixed symmetrically. The cover plates 69, 69 are fixed to the profile 61 by screwing the self-tapping screws N passing therethrough into the respective screw holes 67, 68 of the profile 61 while screwing them. As described above, the lid plate 69,
By fixing 69 to the position near the frame 6 on both end surfaces of the hollow portion 62a, the rigidity of the portion near the frame 6 in the bump pasty 60 including the shape member 61 can be reduced together with the thick portions 64a. And the buckling limit load of the portion near the frame 6 can be increased. The buckling load can be changed by changing the shape of the cover plate 69. Further, the cover plate 69 may be fixed to only one end face of the hollow portion 62a of the profile 61.

When another vehicle or the like collides with the bumper stay 60, the initial load accompanying the collision is transmitted to the bumper stay 60 via the bumper reinforcement 2 in FIGS. Join. When the load applied to the bump pasty 60 exceeds a certain level, as a first stage, the portion of each side wall 64 near the bumper and not covered by the cover plate 69 is buckled and deformed with a relatively low load. In the first stage, the buckling deformation absorbs the collision energy. In the subsequent second stage, when the load applied to the bump pasty 60 further increases, the buckling limit load of the portion including each thick portion 64a near the frame 6 covered by the lid plate 69 on each side wall 64 is exceeded, and these are reduced. In the process of bending deformation, much collision energy is absorbed. By using the bump pasty 60 that reliably generates the two-stage 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 improved.

FIG. 4D shows an end face of an extruded profile 61a in an application form of the profile 61. This profile 61a is shown in FIG.
As shown in (D), a substantially trapezoidal main body 62 and a hollow portion 62a have a predetermined length in the depth direction in the drawing. Its body 6
Reference numeral 2 integrally includes a diagonal piece 63 on the bumper 1 side, an end piece 65 on the frame 6 side, and a pair of side walls 64, 64 connecting the left and right thereof and extending in the front-rear direction of the vehicle body. In the hollow portion 62a, a partition wall 6 for partitioning the hollow portion 62a left and right is provided.
2b and 62c are formed along the longitudinal direction of the vehicle body, and the partition wall 62c near the frame 6 is thicker than the partition wall 62b near the bumper 1. Further, a screw hole 6 having a substantially C-shaped cross section is provided in the middle of each side wall 64 and both ends of the end piece 65.
7, 68 are integrally provided. Incidentally, flanges 66, 66 extend symmetrically on both sides of the end piece 65.

The cover plates 69, 6 are located at positions near the frame 6 on both end surfaces of the hollow portion 62a of the profile 61a.
9 can also be obtained by increasing the buckling limit load in the portion near the frame 6 by fixing the symmetrically 9. Note that the cover plate 69 may be fixed to only one end surface of the hollow portion 62a. Further, the cover plate 69 can be fixed by directly welding to both end surfaces or one end surfaces of the profiles 61, 61a. in this case,
The screw holes 67, 68 of the extruded members 61, 61a may be omitted.

The present invention is not limited to the embodiments described above. For example, in the bump pasties 10 to 20a shown in FIGS. 1 and 2 and the bump pasties 30 and 40 shown in FIG. 3, the number of hollow portions provided inside is arbitrary, and the inner partition wall is also in accordance with the purpose of each embodiment. It can be set as desired. In addition, the bump pasty 1
In the 0 to 20a or the bump pasties 30, 40, a pair of lid plates 69 may be symmetrically fixed to both end surfaces or one end surface of the hollow portion of the moss. In this case, the cover plate 69 is fixed so as to cover the position near the frame 6. At the time of such fixing, if the screw holes 67 and 68 are integrally provided in advance to the extruded shape material forming the bump pasty 10 and the like,
The fixing operation can be easily performed. In addition, the bump pasty of the present invention can be applied to the rear bumper side, and is not limited to bumpers of various kinds of automobiles, and can be used for supporting a skirt at front and rear ends of a railway car, for example.

[0039]

According to the above-described bump pasty according to the present invention (claim 1), the thickness of the side wall or the partition wall near the bumper and the thickness near the frame are made thinner at the time of collision, so that Buckling closer to the bumper and absorbing the collision energy in the first stage, and then buckling deforming the thicker frame closer to absorb more collision energy in the second stage. Therefore, the energy at the time of the collision can be efficiently and reliably absorbed, so that the safety of the occupant can be improved. According to the third aspect of the present invention, since the side wall or the partition wall near the bumper in the bump pasty is made longer, the buckling strength becomes smaller than that near the frame. Deformation is assured as one step. In the case of a collision that cannot be absorbed by such deformation,
As the second stage, the portion near the frame is deformed while absorbing a large amount of energy, so that the collision energy can be efficiently and reliably absorbed, so that the safety of the occupant can be improved.

Further, according to a bump pasty of claim 4,
The first load at the time of the collision reliably induces the plastic deformation of the side wall and the partition wall near the frame of the bump pasty toward the center of the vehicle body to absorb the first-stage collision energy. The side walls, the inclined partition walls and the like are buckled and deformed, so that more collision energy can be absorbed in the second stage. Therefore, the energy at the time of the collision can be efficiently and reliably absorbed, and the safety of the occupant can be improved. In addition, according to the bump pasty of claim 5, the initial load at the time of the collision reliably induces the buckling deformation toward the bumper without the cover plate on the end face, and after absorbing the collision energy of the first stage, Buckling deformation near the frame where the lid plate is fixed to the end face can absorb more collision energy in the second stage. Therefore, the energy at the time of the collision can be efficiently and more reliably absorbed, so that the safety of the occupant can be improved.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a state in which a form of a bump pasty according to the present invention is arranged between a bumper and a frame,
(B) is a plan view showing a cross section of the bump pasty shown in (A) and its vicinity, and (C) is a cross sectional view showing a bump pasty of the applied form.

2 (A) to 2 (D) are cross-sectional views showing a bump pasty in an application form of the bump pasty shown in FIG.

3 (A) to 3 (C) are cross-sectional views showing different forms of bump pasties.

4 (A) is an end view of an extruded profile, FIG. 4 (B) is a perspective view showing a further different form of bump pasty using the profile of FIG.
(C) is a vertical sectional view of the bump pasty of (B), and (D) is an end view showing an applied form of the profile of (A).

FIG. 5A is a schematic view showing the arrangement of a general bump pasty, and FIGS. 5B and 5C are cross-sectional views of a conventional bump pasty.

[Explanation of symbols]

1 …………………………………………………
……… Bumper 6 …………………………………………………
………… Frames 10,10 ', 20,20', 20 ", 20a, 30,30 ',
40,60 ... Bump pasty 12,12a, 12b, 22a-22d, 32a-32f,
62a: hollow portion 14, 15, 24, 34, 44 to 47, 64 ………………
............ Side wall 16, 19a, 24a, 24b, 26b, 64a ...............
............ Thick part 19,25-27,35-37,50-56,62b, 62
c: Partition wall 61, 61a .....................................................
………… Extruded profiles 67, 68 ……………………………………………
……… Bishole 69 ………………………………………………
............ Lid plate

 ──────────────────────────────────────────────────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 1-34-1, Nippon Light Metal Co., Ltd. Group Technology Center

Claims (5)

[Claims] An extruded profile of an aluminum alloy, having one or more hollow portions, disposed between a bumper and a frame so that the direction of extrusion and the front-rear direction of the vehicle body are orthogonal to each other. A bump pasty, wherein a side wall or a side wall and a partition wall, which form the hollow portion and extend in the front-rear direction of the vehicle body, are thinner near the bumper and thicker near the frame. 2. A partition wall substantially perpendicular to the front-rear direction of the vehicle body is formed in the hollow portion, whereby a side wall or a side wall or a partition wall substantially along the front-rear direction of the vehicle body divided into a portion closer to the bumper and a portion closer to the frame, 2. The bump pasty according to claim 1, wherein, in the front-rear direction of the vehicle body, a portion closer to the bumper is made thinner and a portion closer to the frame is made thicker. 3. An extruded profile of an aluminum alloy, having one or more hollow portions, disposed between the bumper and the frame such that the direction of extrusion and the front-rear direction of the vehicle body are orthogonal to each other. A partition wall substantially perpendicular to the front-rear direction of the vehicle body is formed in the hollow portion, and the side wall or the side wall and the partition wall substantially along the front-rear direction of the vehicle body, which is divided into a portion closer to the bumper and a portion closer to the frame, are formed in the front-rear direction of the vehicle body. A bump pasty characterized in that the length closer to the bumper is longer than the length closer to the frame. 4. A bumper and a frame formed of an extruded aluminum alloy material and having a plurality of hollow portions at least along the longitudinal direction of the vehicle body such that the extrusion direction is orthogonal to the longitudinal direction of the vehicle body. The side wall or the side wall and the partition wall forming the hollow portion near the bumper are parallel to the front-rear direction of the vehicle body, and at least a part of the side wall or the partition wall forming the hollow portion near the frame is The bump pasty according to claim 2 or 3, wherein the position near the frame is inclined toward the center of the vehicle body. 5. The bump pasty according to claim 1, wherein a lid plate is fixed at a position close to a frame at one end surface or both end surfaces of the extruded profile in the extrusion direction. .