JP2009046053A - Bumper device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bumper device for a vehicle, reducing a deformation amount of the vehicle at vehicle collision from an oblique direction. <P>SOLUTION: The bumper device for the vehicle is provided with a bumper reinforcer 16 covered by a bumper cover 17, extending in a vehicle width direction and having both end parts bonded to a pair of side members extending in a vehicle longitudinal direction. In the bumper reinforcer 16, one of cylinder members 21, 22 extending in the vehicle width direction is superposed on the other in a vehicle height direction. Respective end parts 21a, 22a of the cylinder members 21, 22 are individually bent/formed along the bumper cover 17 so as to generate a level difference S in the vehicle longitudinal direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle bumper device.

Conventionally, as a bumper device for vehicles, what was indicated, for example in patent documents 1 is known. As shown in FIGS. 6 (a) and 6 (b), the bumper inhose 91 of this vehicular bumper device is bent on the vehicle body side of a bumper inhose main body 92 made of an extruded material extending in the width direction of the vehicle. Both ends are cut off obliquely, and a groove-type reinforcing member 93 is joined to the cut surface from the front side. Thereby, even if both ends of the bumper-in hose body 92 are not excessively bent, a slope can be obtained. In addition, a decrease in strength and the like due to partial excision of both ends of the bumper inhose main body 92 is compensated by the reinforcing member 93, so that, for example, a certain impact resistance is exhibited even in a vehicle collision from an oblique direction. can do.
JP 2006-151095 A

  By the way, in this vehicle bumper device, as shown in the schematic view of FIG. 7 as viewed in the direction of arrow A in FIG. 6B, the bumper cover whose lower end of the bumper inhose 91 covers the bumper inhose 91 is shown. The both ends of the bumper-in hose main body 92 are cut off and the reinforcing members 93 are joined so as not to interfere with 94.

  In this case, the gap with the bumper cover 94 is increased on the upper side of the bumper inhose 91. Therefore, in a vehicle collision from an oblique direction, the amount of deformation of the bumper cover 94, and hence the amount of deformation of the vehicle, increases after the collision occurs in the bumper cover 94 until the bumper inn hose 91 begins to absorb impact energy. End up. In other words, as shown in FIG. 8, the relationship between the deformation (stroke) of the bumper rein hose 91 and the load with the origin when the bumper cover collided, and the load, the bumper rein hose 91 receives impact energy from the initial stage of the collision. An ideal transition (broken line in the figure) that begins to absorb can reduce the amount of deformation of the vehicle, whereas a transition of the conventional example (solid line in the figure) increases the deformation amount of the vehicle.

  In addition, a reinforcing member 93 having a required strength is required to compensate for a decrease in strength or the like due to partial excision (cross-sectional reduction) at both ends of the bumper-in hose body 92. The number of man-hours increases, and as a result, the cost increases.

Furthermore, the cost is inevitably increased due to the addition of a cutting process at the end of the bumper inn hose main body 92 and the generation of a cut piece of the extruded material accompanying the cutting.
The objective of this invention is providing the bumper apparatus for vehicles which can reduce the deformation of a vehicle in the case of the vehicle collision from the diagonal direction.

  In order to solve the above-described problem, the invention according to claim 1 is a bumper in which is covered with a bumper cover and extends in the vehicle width direction and is coupled to a pair of side members whose both ends extend in the vehicle front-rear direction. In the bumper device for a vehicle including a hose, the bumper-in hose includes a plurality of cylindrical members extending in the vehicle height direction and stacked in the vehicle height direction. The gist is to be individually bent along the bumper cover so as to produce a step in the direction.

  According to the same configuration, each end of the plurality of cylindrical members is individually bent along the bumper cover so as not to interfere with the bumper cover, but the cross section of the cylindrical member itself does not shrink, The strength of the tubular member and thus the bumper-in hose can be suitably secured. In addition, by bending and arranging the end portions of the plurality of cylindrical members along the bumper cover, in a vehicle collision from an oblique direction, the bumper cover can be quickly bumped from the initial stage where the collision occurs. Absorption of impact energy by the in-hose can be started, and the amount of deformation of the bumper cover, and hence the amount of deformation of the vehicle, can be reduced. Furthermore, since the bumper-in hose (cylinder member) does not restrict the design of the bumper cover, a vehicle having an excellent design can be obtained. Furthermore, since the bumper-in hose only bends both end portions of each cylindrical member constituting the bumper-in hose, for example, it is not necessary to add a cutting step, and thus excellent productivity can be realized.

The invention according to claim 2 is the vehicle bumper device according to claim 1, wherein each of the cylindrical members has a quadrangular cross section.
According to this configuration, each cylindrical member has a quadrangular cross section, so that bending and drilling can be easily performed.

The invention according to claim 3 is the vehicle bumper device according to claim 1 or 2, wherein the plurality of cylindrical members have the same cross-sectional shape.
According to this configuration, the plurality of cylindrical members have a uniform cross-sectional shape, so that mass production is easy, and the cross-sectional shape can be handled by only one mold (extrusion mold). Can do.

  The invention according to claim 4 is the vehicle bumper device according to any one of claims 1 to 3, and is interposed between both ends of the bumper inhose and the pair of side members, respectively. A pair of crash boxes that absorb impact energy by absorbing the applied load by plastic deformation in the axial direction are provided, and the tip portions of the crash boxes are formed by the end portions of the plurality of cylindrical members. The gist is that a protruding portion protruding by a step is formed.

  According to the same configuration, the crush box has a protruding portion that protrudes by the step at the front end portion of the crash box that is coupled to each end portion of the bumper inhose. In close contact with the bumper-in hose. Therefore, the bumper-in hose and the crash box can be firmly coupled. In addition, the crash box forms a cross-sectional reduced portion by the projecting portion that partially projects outward in the vehicle front-rear direction (bumper in hose side). Therefore, the crush box can suppress a high load (initial peak load) generated at the initial stage of deformation by using the reduced cross section as a starting point of plastic deformation (buckling deformation).

  The present invention can provide a vehicular bumper device that can reduce the amount of deformation of a vehicle in a vehicle collision from an oblique direction.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a vehicle bumper device according to this embodiment applied to a front portion of a vehicle such as an automobile, and FIG. 2 is a plan view thereof. 1 is a cross-sectional view taken along the line AA in FIG. As shown in the figure, this vehicular bumper device has a pair of side members 11 disposed on both sides in the width direction of the vehicle and constituting a part of the body. Each side member 11 is made of, for example, a metal plate, has a hollow structure with a substantially square cross section, and extends in the front-rear direction of the vehicle.

A substantially square bracket 12 made of, for example, a metal plate is fixed to the front end of each side member 11 by welding in a manner that closes the opening of the side member 11.
A crash box 13 made of, for example, a metal plate and extending in the front-rear direction of the vehicle is attached to the front surface of each bracket 12. The crush box 13 is arranged so that the center line in the front-rear direction coincides with the center line in the front-rear direction of the side member 11, and a bolt 14 is attached to the bracket 12 in a bracket 14 fixed to the rear end by welding. And a nut (not shown). The pair of crash boxes 13 absorbs the impact energy by absorbing the applied load by plastic deformation in the axial direction. Each crash box 13 is plastically deformed in an accordion shape in the axial direction.

  A plate 15 made of, for example, a metal plate is fixed to the front end of each crash box 13 by welding in a manner that closes the opening of the crash box 13, and is attached to the plate 15 in the vehicle width direction. Each end of the extended bumper-in hose 16 is fastened with a bolt and a nut (not shown). And this bumper inhose 16 is covered with the bumper cover 17 arrange | positioned in the front side.

  Here, as shown in FIG. 3, the bumper-in hose 16 of this embodiment includes a plurality (two) of cylindrical members 21 and 22 having a quadrangular cross section (positive direction or rectangular shape) extending in the vehicle width direction. The cylinder members 21 and 22 are fixed in the vehicle height direction, for example, by welding. These cylindrical members 21 and 22 are made of, for example, an extruded material of aluminum and have the same cross-sectional shape. Further, the end portions 21a and 22a in the longitudinal direction of the cylindrical members 21 and 22 are individually bent along the shape of the bumper cover 17 so that a step S (see FIG. 1) is generated in the longitudinal direction of the vehicle. Yes. Specifically, the cylindrical members 21 and 22 are bent so that the end portion 22a of the cylindrical member 22 below the end portion 21a of the upper cylindrical member 21 is disposed on the rear side. Thereby, the gap between the bumper inhose 16 and the bumper cover 17 is made uniform.

  On the other hand, the front end portion of each crash box 13 is formed with a protruding portion 13a protruding by the step S formed by the end portions 21a and 22a of the cylindrical members 21 and 22. The plate 15 interposed between the crash box 13 and the bumper inn hose 16 is formed in accordance with the front end surface of the crash box 13. As a result, the crash box 13 is tightly coupled to the bumper-in hose 16 at the front end surface thereof, and supports the bumper-in hose 16.

  Here, when an impact is applied from the front due to a vehicle collision or the like, the impact is transmitted from the bumper cover 17 to the side member 11 (body) via the bumper inn hose 16 and the crash box 13. At this time, the impact box transmitted to the body is buffered by the plastic deformation of the crash box 13 together with the bumper-in hose 16. Thereby, the impact energy applied to the body and the passenger is absorbed.

  Next, the operation of this embodiment will be described. As described above, the end portions 21a and 22a of the plurality of cylindrical members 21 and 22 constituting the bumper-in hose 16 are bent and arranged along the shape of the bumper cover 17, thereby In a vehicle collision from the direction, absorption of impact energy by the bumper inhose 16 is started from the initial deformation of the bumper cover 17. Thereby, the transition of the load with respect to the ideal deformation amount indicated by the broken line in FIG. 8 is obtained, and the deformation amount of the bumper cover 17 can be reduced.

  Further, as schematically shown in FIG. 4A, the tip end portion of the crash box 13 partially protrudes toward the bumper inn hose 16 by the protruding portion 13a and is cross-sectional than the base end portion. The reduced cross-sectional reduced portion is formed. Therefore, as shown in FIG. 5 by the solid line showing the relationship between the amount of deformation of the crash box 13 and the load, the crash box 13 uses the reduced section (projection 13a) as the starting point of plastic deformation (buckling deformation). By doing so, a high load (initial peak load) generated in the early stage of deformation is suppressed. In FIG. 5, the relationship between the amount of deformation and the load of the conventional crash box 81 schematically shown in FIG. As can be seen from the figure, in the crash box 81, since a starting point of plastic deformation (buckling deformation) is not set, a high load (initial peak load) FM is generated at the initial stage of deformation. In particular, when the load FM exceeds a predetermined threshold load Fth that can be allowed in the safety specifications, it is necessary to separately provide an appropriate stress concentration portion (bead or the like) that becomes a starting point of plastic deformation in order to suppress the load FM. become.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, the end portions 21 a and 22 a of the plurality of cylindrical members 21 and 22 are individually bent along the shape of the bumper cover 17 so as not to interfere with the bumper cover 17. Since the cross sections themselves of the cylindrical members 21 and 22 are not reduced, the strength of the cylindrical members 21 and 22 (bumper-in hose 16) can be suitably secured. Further, by bending and arranging the end portions 21a and 22a of the plurality of cylindrical members 21 and 22 along the shape of the bumper cover 17, in the event of a vehicle collision from an oblique direction, the bumper cover 17 Absorption of impact energy by the bumper inhose 16 can be started from the initial stage of deformation, and the amount of deformation of the bumper cover 17 and thus the amount of deformation of the vehicle can be reduced. Specifically, the deformation amount of peripheral parts such as a light, a hood, and a fender substantially integrated with the bumper cover 17 can be reduced. Furthermore, since the bumper-in hose 16 (cylindrical members 21 and 22) does not restrict the design of the bumper cover 17, a vehicle having an excellent design can be obtained. Furthermore, the bumper-in hose 16 is excellent in productivity because it only needs to bend both end portions 21a and 22a of each of the cylindrical members 21 and 22 constituting the bumper-in hose 16 without adding a cutting step, for example. Can be realized.

(2) In this embodiment, since each said cylindrical member 21 and 22 is a cross-sectional square shape, a bending process and a drilling process can be performed easily and the outstanding productivity can be implement | achieved.
(3) In the present embodiment, the plurality of cylindrical members 21 and 22 have a uniform cross-sectional shape, so that mass production is easy, and a single die (extrusion die) regarding the cross-sectional shape. It can be dealt with only. And only the bending type | mold for bending each cylindrical member 21 and 22 should just be prepared separately. Moreover, when the height of the bumper inhose differs depending on the vehicle type, the desired height of the bumper inhose is obtained by changing the number of stages of the cylindrical members (21, 22) stacked in the vehicle height direction. Can do.

  (4) In the present embodiment, a protruding portion 13a that protrudes by the step S is formed at the tip of the crash box 13 that is coupled to each end of the bumper-in hose 16. The crash box 13 is in close contact with the bumper-in hose 16 via the plate 15 at the front end surface thereof. Therefore, the bumper-in hose 16 and the crash box 13 can be firmly coupled.

  (5) Moreover, the said crash box 13 forms a cross-sectional reduction part by the said protrusion part 13a which protrudes partially on the vehicle front-back direction outer side (bumperry hose 16 side). Therefore, the crush box 13 can suppress a high load (initial peak load) generated at the initial stage of deformation by using the reduced cross-sectional portion as a starting point of plastic deformation (buckling deformation). Further, since it is not necessary to separately provide a stress concentration portion (bead or the like) that becomes the starting point of plastic deformation in order to suppress the load generated at the initial stage of deformation of the crash box 13, the number of manufacturing steps can be reduced, and consequently the cost. Can be reduced.

  (6) In the present embodiment, the central portion of the bumper rein hose 16 in the width direction of the vehicle is arranged so that the cylindrical members 21 and 22 are completely overlapped in the height direction to improve the strength. Thus, at the time of a frontal collision of the vehicle, the cylindrical members 21 and 22 can simultaneously absorb impact energy.

In addition, you may change the said embodiment as follows.
In the embodiment, the number of cylinder members stacked in the vehicle height direction may be three or more.

-In above-mentioned embodiment, the cross-sectional shape of the some cylinder member piled up in a vehicle height direction may mutually differ.
In the embodiment, the cross-sectional shape of the cylindrical member may be other than a square (hexagon, octagon, etc.). You may provide a chamfer and a rib suitably in each corner of the polygonal shape of a cylinder member.

-In the said embodiment, if the cross-sectional shape of the crush box 13 is made into a square, a cross-sectional secondary moment can be improved efficiently.
In the embodiment, the cross-sectional shape of the crush box may be other than a square (hexagon, octagon, etc.). You may provide a chamfer and a rib suitably in each corner of a polygonal shape of a crush box.

-In the said embodiment, you may form the crush box 13 with the extrusion material of aluminum.
In the embodiment, the side member 11 and the crash box 13 or the crash box 13 and the bumper in hose 16 may be joined by welding.

-In the said embodiment, you may form the bumper-in hose 16 with a metal plate.
In the embodiment, the crash box 13 may be omitted, and the bumper-in hose 16 (reinforcing member 23) may be directly connected to the side member 11.

The present invention may be applied to the rear portion of the vehicle.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
-At both ends of the bumper inn hose extending in the vehicle width direction, the bumper inn hose is interposed between the bumper inn hose and the pair of side members extending in the vehicle front-rear direction, and the applied load is absorbed by plastic deformation in the axial direction. In a vehicle bumper device including a pair of crash boxes that absorb impact energy
A bumper device for a vehicle, wherein a protruding portion that partially protrudes toward the bumper-in hose side is formed at a tip end portion of each crash box on the bumper-in hose side. According to this technical idea, the front end portion of the crash box is partially protruded toward the bumper inn hose by the protruding portion to form a reduced cross-sectional portion. Therefore, the crush box can suppress a high load (initial peak load) generated at the initial stage of deformation by using the reduced cross section as a starting point of plastic deformation (buckling deformation). Further, since it is not necessary to separately provide a stress concentration portion (bead or the like) that becomes the starting point of plastic deformation in order to suppress the load generated in the initial deformation of the crash box, the number of manufacturing steps can be reduced.

Sectional drawing which shows one Embodiment of this invention. The top view which shows the same embodiment. The perspective view which shows a bumper inn hose. (A) (b) is a schematic diagram which shows operation | movement of the embodiment. The graph which shows the relationship between the deformation of a crash box, and a load. (A) and (b) are the front view and top view which show a prior art example. The schematic diagram which shows operation | movement of a prior art example. The graph which shows the relationship between the deformation of a bumper inn hose, and a load.

Explanation of symbols

  S ... Step, 11 ... Side member, 13 ... Crash box, 13a ... Projection, 16 ... Bumper inhose, 17 ... Bumper cover, 21, 22 ... Cylindrical member, 21a, 22a ... End.

Claims (4)

In a vehicle bumper device including a bumper inhose that is covered by a bumper cover and extends in the vehicle width direction and is coupled to a pair of side members whose both ends extend in the vehicle front-rear direction.
The bumper in horse is
A plurality of cylindrical members extending in the vehicle width direction are stacked in the vehicle height direction,
Each of the end portions of the plurality of cylindrical members is individually bent along the bumper cover so as to have a step in the vehicle front-rear direction. The vehicle bumper device according to claim 1,
Each said cylinder member is a cross-sectional square shape, The bumper apparatus for vehicles characterized by the above-mentioned. The vehicle bumper device according to claim 1 or 2,
The bumper device for a vehicle, wherein the plurality of cylindrical members have the same cross-sectional shape. In the bumper device for vehicles according to any one of claims 1 to 3,
It is interposed between both ends of the bumper inn hose and the pair of side members, and includes a pair of crash boxes that absorbs impact energy by absorbing applied load by axial plastic deformation,
A bumper device for a vehicle, wherein a protruding portion that protrudes by the step formed by each end portion of the plurality of cylindrical members is formed at a tip portion of each crash box.

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