JP5139954B2 - Bumper device for vehicle - Google Patents

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. FIG. 6 is a perspective view showing the vehicle bumper device. As shown in the figure, a bumper inhose 91 made of a metal plate applied to the vehicular bumper device extends in the vehicle width direction, and a pair of crashes whose both ends extend in the vehicle front-rear direction. Coupled to box 92. A pair of groove-shaped beads 91a extending in the direction and juxtaposed in the vehicle height direction are formed in the vehicle width direction central portion of the front wall portion facing the vehicle front side of the bumper inhose 91. ing. Further, the bumper inn hose 91 is formed in a gently curved shape in which the central portion projects forward from both ends in the vehicle width direction in plan view.
JP 2008-56081 A

  By the way, although this bumper inn hose 91 has a bead 91a for increasing rigidity, the bead 91a is arranged only at the center in the vehicle width direction, so that the end of the bead 91a or the crush box 92 is fastened. There is a possibility that twisting is likely to occur on the inside, and sufficient rigidity cannot be increased. In addition, the bumper inhose 91 has a substantially constant radius of curvature over the entire length and is formed in a gently curved shape, so that, for example, the opponent vehicle in which the front part of the vehicle body is gently bent in the vehicle width direction. When the front collision occurs, the input load to the bumper in hose 91 due to the impact of the collision is concentrated at one point in the center in the vehicle width direction, so that the bumper in hose 91 is easily broken, and the shock absorption The generated load will be low.

  It is an object of the present invention to increase the torsional rigidity and to generate a load related to shock absorption when the vehicle front-rear direction end collides with a counterpart vehicle bent in the vehicle width direction. An object of the present invention is to provide a vehicular bumper device equipped with a bumper inhose that can further increase the power consumption.

  In order to solve the above-mentioned problems, the invention according to claim 1 is for a vehicle including a bumper inhose that extends in the vehicle width direction and is coupled to a pair of coupling members whose both ends extend in the vehicle front-rear direction. In the bumper device, the bumper rein hose includes an upper wall portion and a lower wall portion that are spaced apart from each other in a vehicle height direction, and an outer wall that connects between the outer end portions of the upper wall portion and the lower wall portion in the vehicle front-rear direction. And a plate member in which a groove-shaped bead is formed in the vehicle height direction central portion of the outer wall portion over the entire length in the vehicle width direction. A pair of convex portions that are disposed between the coupling position and the center of the bumper inhose and project outward in the vehicle front-rear direction, and the entire range in the vehicle width direction sandwiched between the both convex portions is closer to the vehicle front-rear than the convex portions. Constant to retract inward And summarized in that and a curved portion having a radius of curvature.

  According to this configuration, the bumper inhose made of a plate material having a so-called open cross-sectional shape, which integrally includes the upper wall portion, the lower wall portion, and the outer wall portion, extends over the entire length in the vehicle width direction. Since the groove-shaped bead is formed at the center of the wall in the vehicle height direction, the torsional rigidity can be significantly increased. This is because the torsional load applied to the bumper inhose is suppressed at the bottom of the bead. Further, in the bumper rein hose supported at two locations by the pair of coupling members, for example, when a vehicle front-rear direction end of a vehicle body collides with a counterpart vehicle bent in the vehicle width direction, When the input load to the Pari in hose is concentrated on the two points of the pair of convex portions, the generated load related to shock absorption can be increased.

  According to a second aspect of the present invention, in the vehicular bumper device according to the first aspect, the coupling member includes a hollow member communicating in the vehicle front-rear direction, and an open end of the hollow member facing the bumper-in hose. And an attachment member that joins the hollow member and the bumper-in hose, and the bumper-in hose has the bead recessed so that the bottom of the bead contacts the attachment member. The gist of the present invention is that it is coupled to the coupling member at the bottom of the bead and the contact portion of the mounting member.

  According to this configuration, since the bumper in hose is coupled to the coupling member at the bottom of the bead and the contact portion of the mounting member, for example, the input load to the bumper in hose due to the impact of a collision is Through the bottom of the bead and the mounting member, it can be efficiently transmitted to the coupling member.

  In the present invention, when the torsional rigidity can be increased and the front-rear direction end of the vehicle body collides with a counterpart vehicle that is bent in the vehicle width direction, the generated load related to the impact absorption of the collision is further increased. A bumper device for a vehicle provided with a bumper inhose that can be increased can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a plan 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 cross-sectional view taken along the line AA of FIG. As shown in the figure, a pair of coupling members 11 extending in the vehicle front-rear direction are disposed on both sides in the vehicle width direction. The coupling member 11 includes a crash box 12 as a hollow member and a mounting bracket 13 as a mounting member.

  The crash box 12 is made of, for example, a metal plate, and has a substantially square cylindrical hollow structure communicating in the vehicle longitudinal direction and extends in the vehicle longitudinal direction as shown in FIG. In addition, the base end part arrange | positioned at the vehicle rear side of the crash box 12 is couple | bonded with the side member (not shown) of the hollow structure which has a center line corresponding to the center line and extends in the vehicle front-back direction. Yes. Each side member constitutes a part of the body.

  The mounting bracket 13 is formed, for example, in a rectangular shape with a metal plate, and is joined to the opening end 12 a facing the vehicle front side of the crash box 12. The opening end 12 a of the crash box 12 is closed with a mounting bracket 13. Note that both end portions of the mounting bracket 13 that protrude above and below the crash box 12 form an upper flange 13a and a lower flange 13b that are inclined so as to be displaced toward the rear of the vehicle toward the tip. And as shown in FIG. 1, each edge part 14a of the bumper inn hose 14 extended in the vehicle width direction is attached to the front end of each coupling member 11 (mounting bracket 13).

  The bumper-in hose 14 is formed of, for example, an iron plate, and as shown in FIG. 2, the upper wall portion 21 and the lower wall portion 22 that are spaced apart from each other in the vehicle height direction, and the upper wall portion 21 and the lower wall. An outer wall portion 23 that connects the front side ends of the portion 22 is integrally provided. The upper wall portion 21 is inclined so as to be displaced to the upper side of the vehicle as it goes toward the rear side of the vehicle, and is in contact with the upper flange 13a at the lower surface of the tip portion 21a. Similarly, the lower wall portion 22 is inclined so as to be displaced to the vehicle lower side as it goes to the vehicle rear side, and is in contact with the lower flange 13b on the upper surface of the tip portion 22a.

  A groove-shaped bead 24 is formed at the center of the outer wall 23 in the vehicle height direction over the entire length in the vehicle width direction (see FIG. 3). The bead 24 has a U-shaped cross-sectional shape that opens to the front side of the vehicle, and a bottom portion 24 a that is recessed to the rear side of the vehicle is in contact with the opposing surface of the mounting bracket 13. That is, the bumper-in hose 14 has an M-shaped cross-sectional shape that opens to the rear of the vehicle over the entire length in the vehicle width direction because the bead 24 formed on the outer wall portion 23 is recessed rearward of the vehicle. . In addition, the bottom part 24a arrange | positioned in the vehicle height direction center part of the outer side wall part 23 is extended in the elongate shape over the vehicle width direction full length of the bumper inhose 14. As shown in FIG.

  The bumper-in hose 14 and the mounting bracket 13 (the coupling member 11) are the contact portions of the tip portion 21a and the upper flange 13a, the contact portions of the tip portion 22a and the lower flange 13b, and the opposed surfaces of the bottom portion 24a and the mounting bracket 13. For example, the contact portions are joined together by welding.

  As shown in FIG. 1 with the bending shape exaggerated, the bumper-in hose 14 is bent at a position P closer to the vehicle width direction center O than each coupling member 11, and each end portion 14 a has a vehicle width. The vehicle leans toward the vehicle front-rear direction inside (vehicle body side) as it goes outward. The bumper rein hose 14 forms a bent portion 14b having a certain radius of curvature between the positions P so that the center O in the vehicle width direction retracts most toward the rear side of the vehicle (in the vehicle front-rear direction) in plan view. To do. Therefore, the boundary position (position P) between the end portion 14a and the bent portion 14b protrudes most toward the front side of the vehicle (outside in the vehicle front-rear direction) in the entire range of the bumper inhose 14 in the vehicle width direction, and the pair of convex portions 14c. Form. The outer wall portion 23 is vertically divided into two, including both convex portions 14c and the like, by passing the bead 24 over the entire length in the vehicle height direction central portion.

  The bumper-in hose 14 thus bent (so-called two-node bending) is covered with a resin bumper cover 15 disposed on the front side thereof. The bumper cover 15 determines the design of the front portion of the vehicle, and the bumper inhose 14 is bent along the outer shape of the bumper cover 15.

  Next, the operation when the vehicle front-rear direction end of the vehicle collides with the opponent vehicle V that is gently bent so that the center protrudes outward in the vehicle width direction will be described with reference to FIG. The collision with the opponent vehicle V is a collision with the front portion of the opponent vehicle V at the time of a frontal collision, and is a collision with the rear portion of the opponent vehicle V at the time of a rear-end collision. As is clear from the figure, in the bumper rein hose 14 of the present embodiment, the pair of convex portions 14c protrudes most to the front side of the vehicle (the vehicle front-rear direction outer side), so that the input load is coupled in both directions in the vehicle width direction. The two points (both convex portions 14c) adjacent to the member 11 are concentrated. Therefore, for example, a bumper-in hose that is bent into an arc shape in the vehicle width direction so as to have a constant radius of curvature, or a bumper-in hose that is only bent twice so that both end portions are inclined toward the vehicle body side. Thus, since the input load does not concentrate at one point in the center in the vehicle width direction, the generated load is increased.

  FIG. 5 is a graph showing the transition of the load with respect to the deformation amount (stroke) in the bumper-in hose 14 of the present embodiment. In the figure, for the sake of convenience, the transition of the load of the bumper inhose where the input load is concentrated at one point is drawn together with a two-dot chain line. As is clear from FIG. 5, in this embodiment, it is confirmed that the generated load is larger than that of the bumper-in hose where the input load is concentrated at one point.

  Next, the operation of this embodiment will be described. When an impact is applied from the front due to a vehicle collision or the like, the impact is transmitted from the bumper cover 15 to the both coupling members 11 (body) via the bumper inhose 14. At this time, if the input load due to the impact of the collision is small, the bumper-in hose 14 is elastically deformed in accordance with the deformation of the bumper cover 15, thereby buffering the impact transmitted to the body and the occupant. Further, if the input load due to the impact of the collision is large, both the coupling members 11 (crash box 12) together with the bumper in hose 14 undergo plastic deformation (such as bellows deformation and turning deformation) after the bumper in hose 14 is elastically deformed. The shock transmitted to the body and the passenger is buffered.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, the bumper-in hose 14 made of a plate material having a so-called open cross-sectional shape integrally including the upper wall portion 21, the lower wall portion 22, and the outer wall portion 23 extends over the entire length in the vehicle width direction. The torsional rigidity can be remarkably increased by forming the groove-shaped single bead 24 at the vehicle height direction central portion of the outer side wall portion 23. This is because the torsional load applied to the bumper-in hose 14 is suppressed at the bottom 24 a of the bead 24. In addition, in the bumper-in hose 14 supported at two locations by the pair of coupling members 11, for example, when the vehicle longitudinal direction end of the vehicle body collides with the opponent vehicle V bent in the vehicle width direction, the impact of the collision When the input load to the bumper-in hose 14 is concentrated at two points of the pair of convex portions 14c, the generated load related to shock absorption can be increased.

  In particular, although the input load to the bumper inhose 14 is concentrated at two points of the pair of convex portions 14c, the entire range in the vehicle width direction (curved portion 14b) sandwiched between both convex portions 14c has a constant radius of curvature. By having it bent, the input load to the bumper-in hose 14 can be expanded and received in a planar shape, and the generated load related to shock absorption can be further increased. And the bumper-in hose 14 can be given sufficient strength, and the amount of vehicle deformation can be reduced. Alternatively, the bumper-in hose 14 having a required strength can be further reduced in weight. Further, the bending rigidity of the bumper inn hose 14 can be increased by the amount of the bead 24.

  (2) In the present embodiment, since the bumper rein hose 14 is coupled to the coupling member 11 at the bottom 24a of the bead 24 and the contact part of the mounting bracket 13, for example, The input load can be efficiently transmitted to the coupling member 11 through the bottom 24 a of the bead 24 and the mounting bracket 13.

  (3) In this embodiment, since the bumper-in hose 14 is opened and has a cross-sectional shape, the bumper-in hose 14 can be easily formed by pressing, and the number of manufacturing steps can be reduced as compared with, for example, extrusion molding.

In addition, you may change the said embodiment as follows.
In the above-described embodiment, two or more beads 24 formed in the vehicle height direction center portion of the outer wall portion 23 may be arranged in parallel in the direction.

-In the said embodiment, the cross-sectional shape of the crush box 12 is an example, Comprising: You may change suitably.
In the above-described embodiment, the coupling member 11 (crash box 12) may be omitted and the bumper inhose 14 may be directly connected to the side member.

  The present invention may be applied to the rear portion of the vehicle.

The top view which shows one Embodiment of this invention. Sectional drawing along the AA line of FIG. The perspective view which shows a bumper inn hose. The top view which shows the operation | movement at the time of a collision with a bumper inhose and an other party vehicle. The graph which shows the relationship between the deformation of a bumper inn hose, and a load. The perspective view which shows a prior art form.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Coupling member, 12 ... Crash box (hollow member), 12a ... Open end, 13 ... Mounting bracket (mounting member), 14 ... Bumper inn hose, 14a ... End part, 14b ... Curved part, 14c ... Convex part 21 ... Upper wall part, 22 ... Lower wall part, 23 ... Outer wall part, 24 ... Bead, 24a ... Bottom part.

Claims (2)

In a vehicle bumper device including a bumper inhose that extends in the vehicle width direction and is coupled to a pair of coupling members whose both ends extend in the vehicle front-rear direction,
The bumper in horse is
An upper wall portion and a lower wall portion that are spaced apart in the vehicle height direction, and an outer wall portion that connects between the outer ends of the upper wall portion and the lower wall portion in the vehicle front-rear direction, and a vehicle width It consists of a plate material in which a groove-shaped bead is formed in the vehicle height direction central portion of the outer wall portion over the entire length in the direction,
In the vehicle width direction, a pair of convex portions that are disposed between the coupling position of each coupling member and the center of the bumper in hose and project outward in the vehicle front-rear direction,
A vehicular bumper device comprising: a bent portion having a constant radius of curvature so that the entire range in the vehicle width direction sandwiched between the two convex portions is retracted inward in the vehicle longitudinal direction from the convex portion. The vehicle bumper device according to claim 1,
The coupling member is
A hollow member communicating in the longitudinal direction of the vehicle;
An attachment member joined to the opening end of the hollow member facing the bumper-in hose and coupling the hollow member and the bumper-in hose;
The bumper-in hose has the bead recessed so that the bottom of the bead contacts the mounting member, and is coupled to the coupling member at the bottom of the bead and the contact portion of the mounting member. A vehicular bumper device.

Images