JP2021070380A - Vehicular bumper device - Google Patents

Abstract

To provide a vehicular bumper device which can absorb an impact load during a vehicle collision effectively.SOLUTION: A vehicular bumper device includes: a bumper reinforcement 31 formed with an opening 36 which opens facing a side member of a vehicle body and a hollow part 37 continuous with the opening 36, the bumper reinforcement 31 extending in a vehicle width direction; an impact absorption member 51 which has a fastened part 56 disposed in the opening 36 and protrudes from the bumper reinforcement 31 to the side member; and a fastening member 61 which fastens the fastened part 56 and the bumper reinforcement 31.SELECTED DRAWING: Figure 6

Description

The present invention relates to a vehicle bumper device.

For example, Japanese Patent Application Laid-Open No. 2019-60366 (Patent Document 1) discloses a shock absorbing member attached between a bumper reinforce of a front bumper and a side member extending in the front-rear direction of a vehicle.

Japanese Unexamined Patent Publication No. 2019-60366

As disclosed in Patent Document 1 described above, a vehicle bumper device including a shock absorbing member is disclosed. The shock absorbing member absorbs the shock load by being crushed by receiving the collision load at the time of a vehicle collision. In such a vehicle bumper device, it is required to effectively absorb the impact load at the time of a vehicle collision by sufficiently securing the crushing allowance of the impact absorbing member.

Therefore, an object of the present invention is to provide a vehicle bumper device capable of effectively absorbing an impact load at the time of a vehicle collision.

The vehicle bumper device according to the present invention forms an opening that opens facing the side member of the vehicle body and a hollow portion that is continuous from the opening, and arranges the bumper reinforcement extending in the vehicle width direction and the opening. It has a portion to be fastened, and includes a shock absorbing member protruding from the bumper reinforcement toward the side member, and a fastening member for fastening the fastened portion and the bumper reinforcement.

According to the present invention, it is possible to provide a vehicle bumper device capable of effectively absorbing an impact load at the time of a vehicle collision.

It is a top view which shows the vehicle. It is a perspective view which shows the bumper device for a vehicle in this embodiment. It is a perspective view which shows the bumper for a vehicle in the range surrounded by the alternate long and short dash line III in FIG. It is a side view which shows the bumper device for a vehicle seen in the direction indicated by the arrow IV in FIG. FIG. 3 is a top view showing a vehicle bumper device viewed in the direction indicated by the arrow V in FIG. FIG. 3 is a cross-sectional view showing a vehicle bumper device viewed in the direction of arrow on the VI-VI line in FIG. It is a perspective view which shows the shock absorbing member in FIG. FIG. 7 is a cross-sectional view showing a shock absorbing member seen in the direction of arrow on the line VIII-VIII in FIG. 7. It is a perspective view which shows the deformation of the bumper device for a vehicle at the time of a vehicle collision. It is sectional drawing which shows the deformation of the bumper device for a vehicle at the time of a vehicle collision. It is a side view which shows typically the bumper device for a vehicle in the comparative example. It is a side view which shows typically the deformation of the bumper device for a vehicle in FIG. 11 at the time of a vehicle collision.

Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same number.

FIG. 1 is a top view showing a vehicle. As shown in FIG. 1, the vehicle 12 has side members 14 (14L, 14R), a front bumper 16, and a vehicle bumper device 20 according to the present embodiment.

The side member 14 forms the skeleton of the vehicle body of the vehicle 12. The side member 14 extends in the front-rear direction of the vehicle. The side members 14L and the side members 14R are provided in pairs on the left and right. The side members 14L and the side members 14R are arranged so as to be spaced apart from each other in the vehicle width direction. The front bumper 16 is provided at the front end of the vehicle 12.

The vehicle bumper device 20 is provided behind the vehicle of the front bumper 16. The vehicle bumper device 20 is provided between the front bumper 16 and the side members 14 (14L, 14R) in the vehicle front-rear direction.

The vehicle bumper device of the present invention is not limited to the above, and may be provided between the side members 14 (14L, 14R) and the rear bumper at the rear end of the vehicle in the vehicle front-rear direction.

FIG. 2 is a perspective view showing a vehicle bumper device according to the present embodiment. As shown in FIGS. 1 and 2, the vehicle bumper device 20 includes a bumper reinforcement 31 and a shock absorbing member 51 (51L, 51R).

The bumper reinforcement 31 is provided behind the vehicle of the front bumper 16. The bumper reinforcement 31 is provided at a position separated from the front end of the side member 14 in front of the vehicle. The bumper reinforcement 31 extends in the vehicle width direction.

The shock absorbing member 51 is provided between the bumper reinforcement 31 and the side member 14 in the front-rear direction of the vehicle. The shock absorbing member 51 is connected to the bumper reinforcement 31 and the side member 14.

The shock absorbing member 51L and the shock absorbing member 51R are provided in pairs on the left and right. The shock absorbing member 51L is provided between the bumper reinforcement 31 and the side member 14L in the front-rear direction of the vehicle. The shock absorbing member 51R is provided between the bumper reinforcement 31 and the side member 14R in the front-rear direction of the vehicle.

The shock absorbing member 51L and the shock absorbing member 51R have a symmetrical structure. In the following, the structure of the vehicle bumper device 20 will be described with reference to the shock absorbing member 51L and the bumper reinforcement 31 to which the shock absorbing member 51L is connected.

FIG. 3 is a perspective view showing a vehicle bumper in the range surrounded by the alternate long and short dash line III in FIG. FIG. 4 is a side view showing a vehicle bumper device viewed in the direction indicated by arrow IV in FIG. FIG. 5 is a top view showing a vehicle bumper device viewed in the direction indicated by the arrow V in FIG. FIG. 6 is a cross-sectional view showing a vehicle bumper device viewed in the direction of arrow on the VI-VI line in FIG.

As shown in FIGS. 2 to 6, the bumper reinforcement 31 is made of metal. The bumper reinforcement 31 is made of, for example, an aluminum alloy.

The bumper reinforcement 31 has a front wall portion 32, an upper wall portion 33, and a lower wall portion 34.

The front wall portion 32 is provided at the front end portion of the bumper reinforcement 31. The front wall portion 32 is erected in the vertical direction and has a wall shape extending in the vehicle width direction. The upper wall portion 33 and the lower wall portion 34 lie horizontally and have a wall shape extending in the vehicle width direction. The front end portion of the upper wall portion 33 is connected to the upper end portion of the front wall portion 32. The front end of the lower wall 34 is connected to the lower end of the front wall 32. The upper wall portion 33 and the lower wall portion 34 face each other in the vertical direction.

The bumper reinforcement 31 forms an opening 36 and a hollow portion 37. The opening 36 is open facing the side member 14. The opening 36 forms an opening surface between the rear end portion of the upper wall portion 33 and the rear end portion of the lower wall portion 34. The hollow portion 37 is continuous from the opening 36. The hollow portion 37 corresponds to the space sandwiched between the upper wall portion 33 and the lower wall portion 34 in the vertical direction. The hollow portion 37 corresponds to the space sandwiched between the front wall portion 32 and the opening 36 in the front-rear direction of the vehicle.

FIG. 7 is a perspective view showing the shock absorbing member in FIG. FIG. 8 is a cross-sectional view showing a shock absorbing member seen in the direction of arrow on the line VIII-VIII in FIG. 7. As shown in FIGS. 7 and 8, the shock absorbing member 51 has a wood 58, a case body 52, and a plurality of fastened portions 56.

Wood 58 has a rectangular parallelepiped shape. As the wood 58, for example, cedar wood is used.

The case body 52 houses the wood 58. The case body 52 has the appearance of the shock absorbing member 51. The case body 52 is made of resin. As the resin material of the case body 52, for example, a polyolefin resin such as polypropylene or polyethylene, a polycarbonate resin, a polyester resin such as polyethylene terephthalate or polybutylene terephthalate, a polystyrene resin, or a thermoplastic resin such as an acrylic resin is used. ..

The case body 52 has a housing portion 53, a plurality of tubular portions 55, and a flange portion 54. The housing portion 53, the plurality of tubular portions 55, and the flange portion 54 are integrally molded of a resin material.

The housing portion 53 has a rectangular parallelepiped housing shape corresponding to the shape of the wood 58. The housing portion 53 is provided so as to cover the wood 58. The housing portion 53 includes a front plate portion 71, a rear plate portion 72, an upper plate portion 73, and a lower plate portion 74. The front plate portion 71 is provided in front of the vehicle of the wood 58. The rear plate portion 72 is provided behind the vehicle of the wood 58. The upper plate portion 73 is provided above the wood 58. The lower plate portion 74 is provided below the wood 58.

The plurality of tubular portions 55 are provided in front of the vehicle of the housing portion 53. The plurality of tubular portions 55 are connected to the front plate portion 71. The tubular portion 55 has a tubular shape extending in the vertical direction. The tubular portion 55 has a cylindrical shape. The plurality of tubular portions 55 are arranged at intervals from each other in the vehicle width direction.

The flange portion 54 is provided behind the vehicle in the housing portion 53. The flange portion 54 extends from the rear plate portion 72 in a flange shape in a plane orthogonal to the vehicle front-rear direction. The flange portion 54 is provided with a plurality of bolt insertion holes 81. The bolt insertion hole 81 is a through hole that penetrates the flange portion 54 in the front-rear direction of the vehicle. The shock absorbing member 51 is fastened to the side member 14 in FIG. 2 by a bolt (not shown) inserted into the bolt insertion hole 81.

The fastened portion 56 is made of a metal sleeve. The fastened portion 56 has a cylindrical shape extending in the vertical direction. The plurality of fastened portions 56 are arranged at intervals from each other in the vehicle width direction.

Each of the plurality of fastened portions 56 is held by a plurality of tubular portions 55. The outer peripheral surface of the fastened portion 56 made of a sleeve is covered with a tubular portion 55. The upper end portion 56p of the fastened portion 56 projects upward from the tubular portion 55. The lower end 56q of the fastened portion 56 projects downward from the tubular portion 55.

The wood 58 and the plurality of fastened portions 56 are embedded in the case body 52. The wood 58 and the plurality of fastened portions 56 are provided integrally with the case body 52 by insert molding during resin molding of the case body 52. According to such a configuration, the shock absorbing member 51 in which the wood 58 and the plurality of fastened portions 56 are integrated with the case body 52 can be easily manufactured by using insert molding.

As shown in FIGS. 3 to 6, the plurality of fastened portions 56 are arranged in the opening 36. The plurality of tubular portions 55 are arranged in the opening 36 together with the plurality of fastened portions 56. The plurality of fastened portions 56 are provided at positions separated from the front wall portion 32 of the bumper reinforcement 31 at the rear of the vehicle. The hollow portion 37 is located between the front wall portion 32 and the plurality of fastened portions 56 (plurality of tubular portions 55) in the front-rear direction of the vehicle.

The shock absorbing member 51 projects from the bumper reinforcement 31 toward the side member 14. The front end of the shock absorbing member 51 is arranged in the opening 36. The front end portion of the shock absorbing member 51 is arranged between the upper wall portion 33 and the lower wall portion 34 of the bumper reinforcement 31 in the vertical direction.

The vehicle bumper device 20 further includes a plurality of fastening members 61. The fastening member 61 fastens the fastened portion 56 and the bumper reinforcement 31. The fastening member 61 is made of metal.

The fastening member 61 is provided so as to penetrate the shock absorbing member 51. The fastening member 61 is provided so as to penetrate the shock absorbing member 51 in a direction orthogonal to the vehicle front-rear direction. The fastening member 61 is provided so as to penetrate the shock absorbing member 51 in the vertical direction.

As shown in FIGS. 3 and 6, the bumper reinforcement 31 is provided with a plurality of bolt insertion holes 38 and a plurality of bolt insertion holes 39. The bolt insertion hole 38 is formed of a through hole that penetrates the upper wall portion 33 in the vertical direction. The plurality of bolt insertion holes 38 are arranged at intervals from each other in the vehicle width direction. The bolt insertion hole 39 is composed of a through hole that penetrates the lower wall portion 34 in the vertical direction. The plurality of bolt insertion holes 39 are arranged at intervals from each other in the vehicle width direction. The bolt insertion hole 38 and the bolt insertion hole 39 are provided at positions where they overlap each other in the vertical direction.

The fastening member 61 has a bolt 62 and a nut 66. The bolt 62 is inserted into the bolt insertion hole 38, the fastened portion 56, and the bolt insertion hole 39. The head 62k of the bolt 62 is arranged on the upper wall portion 33. A shaft portion 62j of the bolt 62 is arranged inside the fastened portion 56 made of a sleeve. A nut 66 is screwed into the shaft portion 62j of the bolt 62 protruding from the lower wall portion 34.

With such a configuration, the fastened portion 56 of the shock absorbing member 51 and the upper wall portion 33 and the lower wall portion 34 of the bumper reinforcement 31 are fastened. By using a metal sleeve as the portion to be fastened 56, it is possible to secure a fastening strength that can withstand vibration or the like generated in a vehicle between the bumper reinforcement 31 and the shock absorbing member 51.

The diameter of the shaft portion 62j is smaller than the inner diameter of the fastened portion 56 made of the sleeve. The total length of the shaft portion 62j of the bolt 62 is larger than the length of the wood 58 in the vertical direction. The total length of the fastened portion 56 made of the sleeve in the axial direction is larger than the length of the wood 58 in the vertical direction. The length P2 of the wood 58 in the vehicle front-rear direction is larger than the length P1 of the hollow portion 37 between the front wall portion 32 of the bumper reinforcement 31 and the shock absorbing member 51 in the vehicle front-rear direction.

In the present embodiment, two bolts 62 are used for fastening the fastened portion 56 and the bumper reinforcement 31, but the present invention is not limited to this, and one bolt 62 may be used. A plurality of three or more bolts 62 arranged at intervals in the vehicle width direction may be used. Further, one bolt is inserted into the fastened portion 56 via the upper wall portion 33 of the bumper reinforcement 31, and one bolt is inserted into the fastened portion 56 via the lower wall portion 34 of the bumper reinforcement 31. It may be configured to be inserted into. In this case, it is preferable that a female screw is provided on the inner peripheral surface of the fastened portion 56 made of the sleeve.

The fastening member in the present invention is not limited to the combination of the bolt 62 and the nut 66 described above, and is, for example, a combination of a stud bolt having screw portions at both ends and two nuts screwed at both ends of the stud bolt. May be good.

FIG. 9 is a perspective view showing deformation of the vehicle bumper device at the time of a vehicle collision. FIG. 10 is a cross-sectional view showing deformation of the vehicle bumper device at the time of a vehicle collision.

As shown in FIGS. 9 and 10, when the vehicle collides (when the vehicle collides forward), the bumper reinforcement 31 is subjected to an excessive impact load from the front of the vehicle, so that the bumper reinforcement 31 is directed toward the side member 14. Moving. At this time, the fastening member 61 (shaft portion 62j of the bolt 62) that fastens the bumper reinforcement 31 and the fastened portion 56 of the shock absorbing member 51 heads toward the side member 14 while crushing the wood 58 of the shock absorbing member 51. By moving the vehicle, the impact load at the time of a vehicle collision is absorbed.

FIG. 11 is a side view schematically showing a vehicle bumper device in a comparative example. FIG. 12 is a side view schematically showing the deformation of the vehicle bumper device in FIG. 11 at the time of a vehicle collision.

As shown in FIGS. 11 and 12, the vehicle bumper device in this comparative example has a bumper reinforcement 131 and a shock absorbing member 151.

The bumper reinforcement 131 has a front wall portion 132, a rear wall portion 135, an upper wall portion 133, and a lower wall portion 134. The bumper reinforcement 131 has a closed cross section surrounded by a front wall portion 132, a rear wall portion 135, an upper wall portion 133, and a lower wall portion 134. The front end portion of the shock absorbing member 151 is connected to the rear wall portion 135 of the bumper reinforcement 131. The rear end of the shock absorbing member 151 is connected to the side member 14.

In such a comparative example, when the bumper reinforcement 131 moves toward the side member 14 at the time of a vehicle collision, the shock absorbing member 151 arranged between the bumper reinforcement 131 and the side member 14 collapses in the vehicle front-rear direction. Therefore, the impact at the time of a vehicle collision is absorbed. However, the shock absorbing member 151 inevitably has a portion remaining after the shock absorbing member 151 is crushed (the portion indicated by the dimension L in FIG. 12), and the movement amount St of the bumper reinforcement 131 becomes small. Therefore, it is difficult to sufficiently absorb the impact load at the time of a vehicle collision.

As shown in FIGS. 9 and 10, in contrast to this, in the vehicle bumper device 20 of the present embodiment, the fastened portion 56 of the shock absorbing member 51 is arranged in the opening 36 of the bumper reinforcement 31. Has been done.

With such a configuration, when the bumper reinforcement 31 moves toward the side member 14 at the time of a vehicle collision, the shock absorbing member 51 enters the hollow portion 37 of the bumper reinforcement 31 connected from the opening 36. As a result, the amount of movement of the bumper reinforcement 31 is increased, and it is possible to sufficiently secure the crushing allowance of the wood 58 by the fastening member 61. As a result, according to the vehicle bumper device 20 of the present embodiment, the impact absorbing member 51 can effectively absorb the impact load at the time of a vehicle collision.

Further, in the present embodiment, the fastening member 61 is provided so as to penetrate the shock absorbing member 51. According to such a configuration, when the vehicle collides, the wood 58 is crushed over the entire range in the penetrating direction of the fastening member 61, so that the impact load at the time of the vehicle collision can be absorbed more effectively.

Further, as the fastened portion 56 of the shock absorbing member 51, a metal sleeve into which the fastening member 61 (shaft portion 62j of the bolt 62) is inserted is used. In such a configuration, when the vehicle collides, the fastening member 61 is integrated with the fastened portion 56 to crush the wood 58. At this time, since the fastening member 61 is reinforced by the fastened portion 56 made of a metal sleeve and the force from the wood 58 can be received on the outer peripheral surface of the sleeve, the wood 58 can be crushed more reliably.

As shown in FIGS. 5 to 8, the case body 52 is provided with a plurality of groove portions 76 and a plurality of groove portions 77.

The groove portion 76 has a groove shape that is recessed from the surface of the upper plate portion 73 and extends along the vehicle front-rear direction. The plurality of groove portions 76 are arranged at intervals from each other in the vehicle width direction. Each of the plurality of groove portions 76 is aligned with the plurality of fastening members 61 in the vehicle front-rear direction. The groove portion 76 passes through the central axis 101 of the shaft portion 62j of the bolt 62 and extends on a virtual straight line 102 extending in the front-rear direction of the vehicle.

The groove portion 77 has a groove shape that is recessed from the surface of the lower plate portion 74 and extends along the vehicle front-rear direction. The plurality of groove portions 77 are arranged at intervals from each other in the vehicle width direction. The plurality of groove portions 77 are lined up with the plurality of fastening members 61 in the front-rear direction of the vehicle, respectively. The groove portion 77 is provided at a position overlapping the groove portion 76 when the shock absorbing member 51 is viewed from above.

According to such a configuration, the case body 52 becomes fragile at the position where the groove portions 76 and 77 are provided, so that the fastening member 61 (the shaft portion 62j of the bolt 62) is along the groove portions 76 and 77 at the time of a vehicle collision. It becomes easy to move. As a result, the fastening member 61 advances straight toward the rear of the vehicle, so that a larger crushing allowance for the wood 58 can be secured.

The shock absorbing member in the present invention is not limited to the one using the above-mentioned wood 58, and may be, for example, a metal box.

The configuration and effects of the vehicle bumper device 20 described above will be summarized.

The vehicle bumper device 20 forms an opening 36 that opens facing the side member 14 of the vehicle body and a hollow portion 37 that is continuous from the opening 36, and a bumper reinforcement 31 extending in the vehicle width direction and the opening 36. A shock absorbing member 51 that protrudes from the bumper reinforcement 31 toward the side member 14 and a fastening member 61 that fastens the fastened portion 56 and the bumper reinforcement 31.

According to such a configuration, at the time of a vehicle collision, the fastening member 61 that fastens the fastened portion 56 of the shock absorbing member 51 and the bumper reinforcement 31 crushes the shock absorbing member 51 and side together with the bumper reinforcement 31. Move towards member 14. At this time, since the fastened portion 56 is arranged in the opening 36 of the bumper reinforcement 31, the shock absorbing member 51 enters the hollow portion 37 of the bumper reinforcement 31 connected from the opening 36. As a result, the amount of movement of the bumper reinforcement 31 is increased, and it is possible to sufficiently secure the crushing allowance of the shock absorbing member 51 by the fastening member 61. As a result, the shock absorbing member 51 can effectively absorb the shock load at the time of a vehicle collision.

Further, the fastening member 61 is provided so as to penetrate the shock absorbing member 51. According to such a configuration, since the amount of the shock absorbing member 51 crushed by the fastening member 61 increases, the shock load at the time of a vehicle collision can be absorbed more effectively.

Further, the shock absorbing member 51 further includes a wood 58 and a case body 52 for accommodating the wood 58. According to such a configuration, the fastening member 61 crushes the wood 58 in the shock absorbing member 51 at the time of a vehicle collision, so that the shock load at the time of a vehicle collision can be effectively absorbed.

Further, the fastened portion 56 is a metal sleeve provided on the case body 52 into which the fastening member 61 is inserted.

According to such a configuration, the fastening strength between the bumper reinforcement 31 and the shock absorbing member 51 can be improved.

The case body 52 is made of resin. The wood 58 and the fastened portion 56 are embedded in the case body 52.

According to such a configuration, by utilizing the insert molding, the shock absorbing member 51 in which the wood 58 and the fastened portion 56 are integrated with the case body 52 can be easily manufactured.

Further, the case body 52 is provided with grooves 76, 77 extending in the vehicle front-rear direction along with the fastening member 61 in the vehicle front-rear direction.

According to such a configuration, the fastening member 61 can easily move along the groove portions 76 and 77, which are fragile portions in the case body 52, at the time of a vehicle collision. As a result, it is possible to secure a larger crushing allowance for the wood 58 and more effectively absorb the impact load at the time of a vehicle collision.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The present invention applies to bumper devices mounted on vehicles.

12 Vehicles, 14, 14L, 14R Side Members, 16 Front Bumpers, 20 Vehicle Bumper Devices, 31,131 Bumper Reinforcement, 32,132 Front Walls, 33,133 Upper Walls, 34,134 Lower Walls, 36 Openings Part, 37 Hollow part, 38, 39, 81 Bolt insertion hole, 51, 51L, 51R, 151 Shock absorbing member, 52 Case body, 53 Housing part, 54 Flange part, 55 Cylindrical part, 56 Fastened part, 56p Upper end, 56q lower end, 58 wood, 61 fastening member, 62 bolts, 62j shaft, 62k head, 66 nuts, 71 front plate, 72 rear plate, 73 upper plate, 74 lower plate, 76, 77 Groove, 101 Central axis, 102 Straight, 135 Rear wall.

Claims (6)

A bumper reinforcement that forms an opening that opens facing the side members of the vehicle body and a hollow portion that extends from the opening and extends in the vehicle width direction.
A shock absorbing member having a fastened portion arranged in the opening and projecting from the bumper reinforcement toward the side member.
A vehicle bumper device including a fastening portion and a fastening member for fastening the bumper reinforcement. The vehicle bumper device according to claim 1, wherein the fastening member is provided so as to penetrate the shock absorbing member. The vehicle bumper device according to claim 1 or 2, wherein the shock absorbing member further includes wood and a case body for accommodating the wood. The vehicle bumper device according to claim 3, wherein the fastened portion is a metal sleeve provided on the case body and into which the fastening member is inserted. The case body is made of resin and
The vehicle bumper device according to claim 4, wherein the wood and the fastened portion are embedded in the case body. The vehicle bumper device according to any one of claims 3 to 5, wherein the case body is provided with a groove extending in the vehicle front-rear direction along with the fastening member in the vehicle front-rear direction.

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