JP4685819B2 - Bumper reinforcement support structure - Google Patents

Description

  The present invention relates to a bumper reinforcement support structure, and more particularly to a bumper reinforcement support structure applied to an automobile or the like.

Conventionally, bumper reinforcement support structures applied to automobiles and the like are known (see, for example, Patent Document 1). In this technique, the front side member is formed of FRP made of FRP connected to the energy absorbing portion and joined to the vehicle body part, with the cylindrical cross section causing the successive collapse from the input end side due to the load from the axial direction. The energy absorption portion is composed of a support portion, and the reinforcing fibers are equally orientated in the longitudinal direction of the front side member and the direction perpendicular thereto, and the support portion is oriented with the reinforcing fibers in an isotropic manner.
JP 2005-271875 A

  However, in the technique of Patent Document 1, an L-shaped flange is fixed to the front end side surface of the FRP energy absorbing portion by bonding or the like, and a bumper reinforcement is fixed to the L-shaped flange using a bolt or the like. For this reason, it is difficult to transmit the load from the bumper reinforcement substantially uniformly to the front end surface of the FRP energy absorbing portion.

  In view of the above facts, an object of the present invention is to provide a bumper reinforcement support structure that can transmit a load from the bumper reinforcement to the front end surface of the energy absorbing member substantially uniformly.

The bumper reinforcement support structure of the present invention according to claim 1 is composed of a bumper reinforcement arranged in the longitudinal direction along the vehicle width direction and a fiber reinforced resin material, and arranged in the longitudinal direction of the vehicle body in the longitudinal direction. An energy absorbing member comprising: a plurality of main wall portions, and a mounting wall portion integrally molded from the longitudinal ends of the main wall portions toward the vehicle width inner side and to which the bumper reinforcement is attached. The vehicle width direction outside part protrudes from the attachment wall part of the energy absorption member to the vehicle width outside direction , and has a reinforcing member that reinforces the attachment wall part of the energy absorption member.

The energy absorbing member is made of a fiber reinforced resin material, and has a plurality of main wall portions arranged in the longitudinal direction along the longitudinal direction of the vehicle body, and is integrally formed in the vehicle width inner side direction from the longitudinal direction ends of these main wall portions. A bumper reinforcement having a longitudinal direction arranged along the vehicle width direction is attached to the mounting wall portion. Moreover, the vehicle width direction outer side part protrudes in the vehicle width outer side direction from the attachment wall part of an energy absorption member, and the reinforcement member which reinforces the attachment wall part of an energy absorption member is provided. For this reason, when a load is intended to act unevenly from the attachment part of the bumper reinforcement toward the longitudinal direction end of the energy absorbing member in the longitudinal direction, the load from the bumper reinforcement is absorbed by the reinforcing member. It is transmitted substantially uniformly to the front end surface of the mounting wall portion of the member.

  According to a second aspect of the present invention, in the bumper reinforcement support structure according to the first aspect, the reinforcing member is provided between a mounting wall portion of the energy absorbing member and the bumper reinforcement. To do.

  Since the reinforcing member is provided between the mounting wall portion of the energy absorbing member and the bumper reinforcement and has a sandwich structure, a load can be transmitted substantially uniformly from the bumper reinforcement to the front end surface of the energy absorbing member with a simple configuration.

According to a third aspect of the present invention, in the bumper reinforcement support structure according to any one of the first and second aspects, a reinforcing fiber protruding from a peripheral end of the mounting wall portion of the energy absorbing member, and a metal plate The reinforcing member made of is not in contact with each other.

The reinforcing fiber that protrudes from the peripheral edge of the mounting wall portion of the energy absorbing member does not contact the reinforcing member made of the metal plate . For this reason, the electrolytic corrosion which generate | occur | produces by contact with a reinforced fiber and a reinforcement member is prevented.

  According to a fourth aspect of the present invention, in the bumper reinforcement support structure according to any one of the first to third aspects, the bumper reinforcement is attached to the mounting wall portion and the reinforcing member of the energy absorbing member. A mounting portion is provided.

  The bumper reinforcement is easily attached to the energy absorbing member and the reinforcing member by the attaching portions provided on the attaching wall portion and the reinforcing member of the energy absorbing member.

  According to the first aspect of the present invention, a load can be transmitted substantially uniformly from the bumper reinforcement to the front end surface of the energy absorbing member.

  According to the second aspect of the present invention, a load can be transmitted substantially uniformly from the bumper reinforcement to the front end surface of the energy absorbing member with a simple configuration.

  According to the third aspect of the present invention, the electrolytic corrosion generated by the contact between the reinforcing fiber and the reinforcing member can be prevented.

  According to the fourth aspect of the present invention, bumper reinforcement can be easily attached to the energy absorbing member and the reinforcing member.

  One embodiment of the bumper reinforcement support structure in the present invention will be described with reference to FIGS.

  In the figure, the arrow UP indicates the vehicle upward direction, the arrow FR in the figure indicates the vehicle forward direction, and the arrow IN in the figure indicates the vehicle width inside direction.

  FIG. 1 is a perspective view of a bumper reinforcement support structure according to an embodiment of the present invention as viewed from the obliquely rearward outer side of a vehicle.

  As shown in FIG. 1, in the automobile body of the present embodiment, crash boxes 10 as energy absorbing members are disposed along the longitudinal direction of the vehicle at the lower portions of both ends in the vehicle width direction of the engine room as the front part of the vehicle body. ing. The crash box 10 is provided at the front end of each of the pair of left and right front side members. FIG. 1 shows the crash box 10 on the right side of the vehicle.

  The crash box 10 is made of CFRP (carbon fiber reinforced resin) as a fiber reinforced resin, and a cross-sectional shape viewed from the vehicle front-rear direction is an uneven shape including an upper end vertical wall portion 10A and a lower end vertical wall portion 10B. Yes.

  More specifically, the crash box 10 includes a plurality of main wall portions 10C, 10D, 10E, 10F, 10G, 10H, and 10J, the longitudinal direction of which is arranged along the longitudinal direction of the vehicle body. The part forms two U-shaped cross sections that are connected vertically with the opening directed inward in the vehicle width direction. In addition, an upper end vertical wall portion 10A, which is one of the main wall portions, is formed from the inner end in the vehicle width direction of the upper end main wall portion 12C toward the upper side of the vehicle, and the lower end main wall portion 10J is inward in the vehicle width direction. A lower end vertical wall portion 10B, which is one of the main wall portions, is formed from the end toward the vehicle lower side.

  Note that the plurality of main wall portions are a plurality of horizontal wall portions 10C, 10E, 10G, 10J and vertical wall portions 10A, 10B, 10D, which are arranged in the longitudinal direction of the vehicle body in the longitudinal direction of the crash box 10. 10F, 10H, etc., and these horizontal and vertical wall portions are connected to each other.

  Further, the main wall portions 10C, 10E, 10G, and 10J are continuously widened in the vehicle width direction from the vehicle front toward the vehicle rear.

  FIG. 2 is a perspective view of the bumper reinforcement support structure according to the embodiment of the present invention as seen from the obliquely rearward inner side of the vehicle.

  As shown in FIG. 2, a mounting wall 10 </ b> K is integrally formed from the front end, which is the longitudinal end of the crash box 10, toward the inner side in the vehicle width direction. Further, the vehicle width of the main wall portions 10C, 10D, 10E, 10F, 10G, 10H, and 10J as viewed from the vehicle front-rear direction is provided at the tip end portion (the vehicle width direction inner end portion) of the mounting wall portion 10K of the crash box 10. A protruding portion 10L that protrudes inward in the direction is formed.

  The crash box 10 is manufactured by RTM molding or the like.

  As shown in FIG. 2, a bumper reinforcement 20 is disposed along the vehicle width direction at the front end lower portion of the engine room which is the front portion of the vehicle body. The bumper reinforcement 20 has both end portions 20 </ b> A in the vehicle width direction attached to the attachment wall portion 10 </ b> K of the crash box 10.

  3 is a cross-sectional view taken along the line 3-3 in FIG. 2, and FIG. 4 is an enlarged cross-sectional view taken along the line 4-4 in FIG.

  As shown in FIG. 3, the rear surface of the rear wall portion 20 </ b> B of the bumper reinforcement 20 is attached to the attachment wall portion 10 </ b> K of the crash box 10.

  As shown in FIG. 4, the bumper reinforcement 20 is made of a metal extruded material having a cross-sectional shape viewed from the vehicle width direction, and a plurality of front wall portions 20 </ b> C of the bumper reinforcement 20 are formed on the front wall portion 20 </ b> C. The working hole 22 is formed.

  Further, a reinforcing plate 30 as a reinforcing member is provided between the rear wall portion 20B of the bumper reinforcement 20 and the front surface 10M of the mounting wall portion 10K of the crash box 10, and the reinforcing plate 30 has a flat plate shape. Yes.

  The reinforcing plate 30 reinforces the mounting wall portion 10K of the crash box 10 when a load is transmitted from the bumper reinforcement 20 to the mounting wall portion 10K of the crash box 10 in the event of a vehicle collision.

  In the present embodiment, the reinforcing plate 30 is formed of a metal plate such as iron or aluminum to a predetermined thickness T1, and is deformed or broken when a load is transmitted from the bumper reinforcement 20 to the crash box 10 at the time of a vehicle collision. It is set as the structure which ensured sufficient intensity | strength which does not do.

  Therefore, when a load (arrow F1 in FIG. 4) acts from the front of the vehicle toward the rear of the vehicle on the mounting wall 10K at the front end of the crash box 10 from the bumper reinforcement 20, the collision object that collides with the bumper reinforcement 20 is detected. Depending on the material and shape, if the rear wall portion 20B of the both ends 20A in the vehicle width direction of the bumper reinforcement 20 is to be deformed as shown by a two-dot chain line in FIG. By reinforcing the ten attachment wall portions 10K, the load (arrow F2 in FIG. 4) from the bumper reinforcement 20 can be transmitted substantially uniformly to the front surface of the attachment wall portion 10K of the crash box 10. As a result, the crash box 10 is sequentially broken from the vehicle front side to the vehicle rear side along the axial direction (vehicle longitudinal direction).

  Although not shown in the figure, the mounting wall portion 10K of the crash box 10 is reinforced by the reinforcing plate 30 even when the vehicle width direction both ends 20A of the bumper reinforcement 20 are about to deform in the vehicle front-rear direction in plan view. By doing so, the load from the bumper reinforcement 20 can be transmitted substantially uniformly to the front surface of the mounting wall portion 10K of the crash box 10.

  As shown in FIG. 4, the upper peripheral terminal 10N in the mounting wall 10K of the crash box 10 is arranged at a predetermined interval S1 on the outer peripheral side (the vehicle upper side) from the upper peripheral terminal 30A of the reinforcing plate 30. The lower peripheral edge terminal 10P in the mounting wall portion 10K of the crash box 10 is arranged with a predetermined interval S2 on the outer peripheral side (vehicle lower side) from the lower peripheral terminal 30B of the reinforcing plate 30.

  As shown in FIG. 3, the vehicle width direction inner peripheral edge terminal 10Q in the mounting wall portion 10K of the crash box 10 has a predetermined distance S3 on the outer peripheral side (vehicle width direction inner side) from the vehicle width direction inner peripheral terminal 30C of the reinforcing plate 30. It is arranged with a gap.

  Accordingly, the reinforcing fiber (carbon fiber) constituting the crash box 10 protruding from the upper peripheral terminal 10N, the lower peripheral terminal 10P, and the vehicle width direction inner peripheral terminal 10Q in the mounting wall 10K of the crash box 10 and the reinforcement of the metal plate Contact with the plate 30 can be prevented. As a result, the electrolytic corrosion generated by the contact between the reinforcing fiber and the reinforcing plate 30 is prevented.

  The outer end in the vehicle width direction of the mounting wall portion 10K of the crash box 10 is a bent portion 10R, and no reinforcing fiber protrudes from the bent portion 10R. For this reason, the vehicle width direction outer side portion 30D of the reinforcing plate 30 protrudes in the vehicle width outer direction from the bent portion 10R of the mounting wall portion 10K. Further, by projecting the vehicle width direction outer side portion 30D of the reinforcing plate 30 from the bent portion 10R of the mounting wall portion 10K toward the vehicle width outer side, the mounting wall portion 10K and the plurality of main wall portions are separated at the time of a vehicle collision. Even if the relative position shift in the vehicle width direction occurs between the bumper reinforcement 20 and the crash box 10, the load is reliably transmitted from the bumper reinforcement 20 to the crash box 10.

  As shown in FIG. 4, a through hole 34 is formed in the mounting wall 10 </ b> K of the crash box 10 as a mounting portion for inserting the nut 28, and the reinforcing plate 30 is a mounting portion through which the bolt 26 is inserted. Through-holes 36 are formed.

  Most of the nut 28 is embedded in the through hole 34 of the mounting wall 10K of the crash box 10 from the rear side of the vehicle, and the bolt 26 does not protrude from the nut 28 to the rear side of the vehicle. The crash stroke is lengthened.

  Further, the bolt 26 inserted from the work hole 22 formed in the front wall portion 20C of the bumper reinforcement 20 passes through the rear wall portion 20B of the bumper reinforcement 20, the reinforcing plate 30, and the mounting wall portion 10K of the crash box 10. The bolt 26 is fastened to a nut 28 provided on the mounting wall 10K of the crash box 10.

  Accordingly, the bumper reinforcement 20 is fixed to the mounting wall portion 10K of the crash box 10 with the bolts 26 and the nuts 28 with the reinforcing plate 30 interposed therebetween.

  2, the rear wall portion 20B of the bumper reinforcement 20 is attached to the mounting wall portion 10K of the crash box 10 by three sets of bolts 26 and nuts 28 provided at predetermined intervals in the vehicle vertical direction. It is fixed.

  Next, the operation of this embodiment will be described.

  The crash box 10 of the present embodiment is made of CFRP as a fiber reinforced resin, and the upper end vertical wall portion 10A, the lower end vertical wall portion 10B, and the main wall portions 10C, 10D are arranged in the longitudinal direction along the longitudinal direction of the vehicle body. 10E, 10F, 10G, 10H, and 10J, and a mounting wall portion 10K that is integrally molded from the front end toward the vehicle width inner side. The longitudinal direction of the mounting wall portion 10K extends in the vehicle width direction. A bumper reinforcement 20 arranged along the rail is attached by bolts 26 and nuts 28.

  The bumper reinforcement 20 is fixed to the mounting wall portion 10K of the crash box 10 with the reinforcing plate 30 interposed therebetween, and the reinforcing plate 30 is formed with a predetermined plate thickness T1 by a metal plate such as iron or aluminum. In the event of a vehicle collision, deformation or breakage is prevented when a load is transmitted from the bumper reinforcement 20 to the crash box 10.

  For this reason, when a load (arrow F1 in FIG. 4) acts from the front of the vehicle toward the rear of the vehicle on the mounting wall 10K at the front end of the crash box 10 from the bumper reinforcement 20 at the time of the vehicle collision, the bumper reinforcement 20 collides. Even if the rear wall portion 20B of the both ends 20A in the vehicle width direction of the bumper reinforcement 20 is deformed as shown by a two-dot chain line in FIG. By reinforcing the mounting wall portion 10K of the crash box 10 by 30, the load (arrow F2 in FIG. 4) from the bumper reinforcement 20 can be transmitted substantially uniformly to the front surface of the mounting wall portion 10K of the crash box 10. Although not shown in the drawings, the mounting wall portion 10K of the crash box 10 is reinforced by the reinforcing plate 30 even when the vehicle width direction both ends 20A of the bumper reinforcement 20 try to deform in the vehicle front-rear direction in plan view. By doing so, the load from the bumper reinforcement 20 can be transmitted substantially uniformly to the front surface of the mounting wall portion 10K of the crash box 10. As a result, the crash box 10 is sequentially broken from the front side of the vehicle to the rear side of the vehicle along the axial direction (vehicle longitudinal direction), so that the crash box 10 is crushed and broken in a breaking mode capable of exhibiting a target energy absorption characteristic. Can do.

  Further, the weight of the vehicle can be reduced as compared with the case where the thickness (T2 in FIG. 4) of all the regions in the rear wall portion 20B of the bumper reinforcement 20 is increased to obtain the same effect.

  Further, the configuration is simple because the reinforcing plate 30 having a flat plate shape is provided between the bumper reinforcement 20 and the mounting wall portion 10K of the crash box 10.

  Further, the bumper reinforcement 20 can be easily attached to the mounting wall portion 10K of the crash box 10 by the through hole 34 provided in the mounting wall portion 10K of the crash box 10 and the through hole 36 provided in the reinforcing plate 30. it can.

  In the present embodiment, as shown in FIG. 2, the upper peripheral terminal 10N in the mounting wall 10K of the crash box 10 has a predetermined interval S1 on the outer peripheral side (the vehicle upper side) from the upper peripheral terminal 30A of the reinforcing plate 30. The lower peripheral terminal 10P in the mounting wall portion 10K of the crash box 10 is disposed at a predetermined interval S2 on the outer peripheral side (vehicle lower side) from the lower peripheral terminal 30B of the reinforcing plate 30. ing. Further, as shown in FIG. 3, the inner peripheral edge terminal 10Q in the vehicle width direction of the mounting wall portion 10K of the crash box 10 has a predetermined distance from the inner peripheral edge terminal 30C in the vehicle width direction of the reinforcing plate 30 to the outer peripheral side (in the vehicle width direction) It arrange | positions at intervals S3.

  Therefore, the CFRP carbon reinforcing fiber constituting the crash box 10 projecting from the upper peripheral terminal 10N, the lower peripheral terminal 10P, and the vehicle width direction inner peripheral terminal 10Q in the mounting wall 10K of the crash box 10 and the reinforcement of the metal plate Contact with the plate 30 can be prevented. As a result, the electrolytic corrosion of the reinforcing plate 30 caused by the contact between the reinforcing fiber of the crash box 10 and the reinforcing plate 30 can be prevented.

While the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

For example, in the above embodiment, the crush box 10 is made of CFRP (carbon fiber reinforced resin), but the fiber reinforced resin is not limited to CFRP, and may be other fiber reinforced resin such as glass fiber reinforced resin.

  Moreover, the cross-sectional shape seen from the longitudinal direction of the crash box 10 is not limited to the cross-sectional shape of the said embodiment, Other shapes may be sufficient.

  Moreover, the cross-sectional shape and material seen from the vehicle width direction of the bumper reinforcement 20 are not limited to the above embodiment.

  Moreover, in the said embodiment, although the reinforcement board 30 was comprised by metal plates, such as iron and aluminum, it replaces with these, when a load is transmitted to the crash box 10 from the bumper reinforcement 20 at the time of a vehicle collision. Alternatively, the plate may be made of another material having a thickness that ensures sufficient strength without deformation or breakage.

  In the above embodiment, the reinforcing plate 30 has a flat plate shape. Instead, the reinforcing plate 30 is provided with a corrugated plate shape or a plate shape or a flange having convex portions (beads) formed at a predetermined interval. It is good also as a shape.

  Moreover, in the said embodiment, although the through-hole 34 as an attachment part was formed in the attachment wall part 10K of the crash box 10, and the through-hole 36 as an attachment part was formed in the reinforcement board 30, the attachment part is the through-hole 34, It is not limited to 36, and may be constituted by other attaching parts such as a convex part, a concave part, an engaging part, and a bolt.

  In the above embodiment, the mounting wall portion 10K of the crash box 10 is integrally molded from the front end of the main wall portions 10C, 10D, 10E, 10G, 10H, and 10J toward the inside in the vehicle width direction. The mounting wall 10K of the crash box 10 may be integrally formed from the front end of the main wall 10C, 10D, 10E, 10G, 10H, 10J toward the outside in the vehicle width direction.

  In the above embodiment, the bumper reinforcement support structure of the present invention is applied to the front side member. However, the bumper reinforcement support structure of the present invention can be applied to other parts such as the rear side member in addition to the front side member. It is.

It is the perspective view seen from the vehicles slanting back outside which shows the bumper reinforcement support structure concerning one embodiment of the present invention. It is the perspective view seen from the vehicle slanting back inner side which shows the bumper reinforcement support structure which concerns on one Embodiment of this invention. FIG. 3 is an enlarged cross-sectional view taken along the line 3-3 in FIG. 2. FIG. 4 is an enlarged cross-sectional view taken along a line 4-4 in FIG. 3.

Explanation of symbols

10 Crash box (energy absorbing member)
10A Crash box top vertical wall (main wall)
10B Lower end vertical wall (main wall) of the crash box
10C Main wall part of crash box 10D Main wall part of crash box 10E Main wall part of crash box 10F Main wall part of crash box 10G Main wall part of crash box 10H Main wall part of crash box 10J Main wall part of crash box 10K Crash box mounting wall portion 10N Upper peripheral edge terminal of crash box mounting wall portion 10P Lower peripheral edge terminal of crash box mounting wall portion 10Q Vehicle width direction inner peripheral terminal of crash box mounting wall portion 10R Crash box mounting wall portion Bending part 20 Bumper reinforcement 30 Reinforcement plate (reinforcement member)
30A Upper peripheral end of the reinforcing plate 30B Lower peripheral end of the reinforcing plate 30C Inner peripheral end of the reinforcing plate in the vehicle width direction 30D Outer portion of the reinforcing plate in the vehicle width direction 34 Through hole (attachment portion)
36 Through hole (Mounting part)

Claims (4)

A bumper reinforcement arranged in the longitudinal direction along the vehicle width direction;
A plurality of main wall portions made of a fiber reinforced resin material and arranged in the longitudinal direction of the vehicle body in the longitudinal direction, and integrally formed from the longitudinal ends of the main wall portions toward the vehicle width inner side , An energy absorbing member having a mounting wall portion to which the reinforcement is mounted;
A vehicle width direction outer side portion protrudes from the mounting wall portion of the energy absorbing member toward the vehicle width outer side, and a reinforcing member that reinforces the mounting wall portion of the energy absorbing member;
The bumper reinforcement support structure characterized by having.   The bumper reinforcement support structure according to claim 1, wherein the reinforcing member is provided between a mounting wall portion of the energy absorbing member and the bumper reinforcement. The bumper reinforcement according to any one of claims 1 and 2, wherein the reinforcing fiber protruding from the peripheral end of the mounting wall portion of the energy absorbing member does not contact the reinforcing member made of a metal plate. Support structure.   The bumper reinforcement support structure according to any one of claims 1 to 3, wherein a mounting portion for mounting the bumper reinforcement is provided on the mounting wall portion and the reinforcing member of the energy absorbing member.

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