JP5440391B2 - Vehicle rear structure - Google Patents

Description

  The present invention relates to a vehicle rear structure.

  Patent Document 1 below discloses a structure in which a gusset is disposed on an upper portion of a rear side member and a rear side member is deformed in a Z-shape in a side view in a rocker rear when a vehicle with a high vehicle height collides from the rear of the vehicle. ing.

Japan Society of Invention and Innovation Technical Bulletin No. 2009-501276

  However, in the case of the above prior art, for example, when the distance from the rear end of the vehicle to the rear seat such as a compact car is short, there is a possibility that an impact is transmitted to the rear seat due to the Z-shaped mode deformation.

  In consideration of the above fact, the present invention suppresses the transmission of an impact to the rear seat when a vehicle having a load input position at a position higher than the rear side member collides from the rear of the vehicle (hereinafter referred to as “rear collision”). The object is to obtain a vehicle rear structure that can be used.

The vehicle rear structure according to the first aspect of the present invention is provided on a vehicle upper side of a rear side member extending along the vehicle front-rear direction on both sides of the vehicle rear portion, and a rear end portion of the rear side member in the vehicle front-rear direction. A load receiving member that receives a load at the time of a rear collision with a vehicle having a load input position higher than the rear side member, and a vehicle front-rear direction from the load receiving member to the vehicle front side of the rear side member on the vehicle upper side And a bending deformation member that is capable of transmitting a load to the rear side member at the time of a rear collision and capable of bending deformation, and a part of the bending deformation member that is coupled to the load receiving member. possess together transmitted to the bending deformation member load applied, the deformation starting point imparting member bent give the origin of bending deformation of the bending deformation member, to the bending deformation origin Given member, when the bending deformation of at least the bending deformation member, and has a contact portion in contact with the surface of the bending deformation member.

The invention of claim 2 is the vehicle rear portion structure according to claim 1, wherein the contact portion is assumed to be a corner portion formed on the bending deformation origin imparting member.

According to a third aspect of the present invention, in the vehicle rear portion structure according to the first or second aspect , the load receiving member is spanned between both side walls spaced apart in the vehicle width direction and the both side walls. And a reinforcing portion.

According to a fourth aspect of the present invention, in the vehicle rear portion structure according to the third aspect, the bending deformation starting point providing member is disposed along a line connecting the reinforcing portion and the starting point in a side view of the vehicle. It is.

According to a fifth aspect of the present invention, in the vehicle rear portion structure according to any one of the first to fourth aspects, the bending deformation starting point applying member includes a rear end and an upper end of the load receiving member and the starting point. It arrange | positions along the connected straight line, or is arrange | positioned below the said vehicle rather than the said straight line.

  According to the first aspect of the present invention, the load receiving member is disposed on the vehicle upper side of the rear side end portion of the rear side member in the vehicle longitudinal direction, and the vehicle is located on the vehicle upper side of the rear side member from the load receiving member to the vehicle front side. A bending deformation member is disposed along the vehicle front-rear direction. When a vehicle having a load input position higher than the rear side member collides with the rear surface, the load receiving member receives a load, and the load receiving member receives the load. It is transmitted to the bending deformation member and the rear side member. At that time, a part of the bending deformation starting point providing member is arranged in a state of being coupled to the load receiving member, and the load acting on the load receiving member is bent and deformed by the bending deformation starting point applying member being in contact with the bending deforming member. It is transmitted to the bending deformation member via the starting point giving member. Then, after the necessary reaction force is generated by the bending deformation member, the contact point between the bending deformation starting point applying member and the bending deformation member becomes the starting point of deformation, and the bending deformation member is bent to deform, thereby absorbing the impact. Can do. Therefore, compared with the case where the rear side member of the prior art is deformed in the Z-shape mode, the deformed portion of the bending deformation member can be set at a position away from the rear seat on the vehicle rear side, so that the impact is not transmitted to the rear seat. Can do.

Further, the bending deformation starting point imparting member has a contact portion that contacts the surface of the bending deformable member at least during the bending deformation of the bending deformable member, and the contact portion of the bending deformation starting point imparting member becomes the starting point of deformation, The bending deformation member can be bent and deformed at a target position. Therefore, it can suppress more reliably that an impact is transmitted to a rear seat.

According to the second aspect of the present invention, since the corner portion formed on the bending deformation starting point giving member contacts the surface of the bending deformation member, the corner portion becomes the starting point, and the bending deformation member is easily bent and deformed.

According to the third aspect of the present invention, the reinforcing portion is bridged between the both side walls spaced apart in the vehicle width direction in the load receiving member. Accordingly, the load receiving member can be made rigid by the reinforcing portion while suppressing the plate thickness of the load receiving member.

According to the fourth aspect of the present invention, the bending deformation starting point providing member is formed along a line connecting the reinforcing portion and the starting point at which the bending deformation starting point applying member contacts the surface of the bending deforming member in a side view of the vehicle. The load applied to the load receiving member at the time of the rear collision is efficiently transmitted to the reinforcing portion, the bending deformation starting point providing member, and the bending deformation member. For this reason, a bending deformation member can be bend-deformed with a cheaper and simple structure.

According to the fifth aspect of the present invention, the bending deformation starting point imparting member is on a straight line connecting the rear end and upper end of the load receiving member and the starting point where the bending deformation starting point imparting member contacts the surface of the bending deforming member. The load applied to the load receiving member can be easily transmitted to the bending deformation member via the bending deformation starting point applying member.

  As described above, the vehicle rear structure according to the first aspect of the present invention can suppress an impact from being transmitted to the rear seat at the time of a rear collision of the vehicle having a load input position higher than the rear side member. Has an excellent effect.

The vehicle rear structure according to the second aspect of the present invention has an excellent effect that the bending deformation member is easily bent and can be bent and deformed at a target position.

The vehicle rear structure according to the third aspect of the present invention has an excellent effect that the load receiving member is rigidized by the reinforcing portion while suppressing the plate thickness of the load receiving member, and the cost can be reduced.

The vehicle rear structure according to the fourth aspect of the present invention has an excellent effect that the bending deformation member can be bent and deformed with a cheaper and simpler configuration at the time of a rear collision.

The vehicle rear portion structure according to the present invention according to claim 5 has an excellent effect that it is possible to easily transmit the load acting on the load receiving member at the time of a rear collision to the bending deformation member via the bending deformation starting point providing member. .

It is a side view showing the rear part of the vehicle provided with the vehicle rear part structure concerning one embodiment, and is a figure showing the state where the automobile which has the load input position in the position higher than the rear side member at the rear part of the vehicle collides rearward. It is the perspective view which looked at the vehicle rear part structure shown in FIG. 1 from the vehicle front side. It is the perspective view which looked at the vehicle rear part structure shown in FIG. 1 from the vehicle rear side. It is a longitudinal cross-sectional view which shows the rear side member of the vehicle rear part structure shown in FIG. 1, a pipe, and a gusset in the cross section along a vehicle width direction. It is a side view which shows the vehicle rear part structure shown in FIG. It is a top view which shows the vehicle rear part structure shown in FIG. FIG. 5 is an enlarged longitudinal sectional view of a rear side member, a pipe and a gusset of the vehicle rear structure shown in FIG. 4. (A), (B) is a side view which shows the process in which the pipe at the time of the rear surface collision in the vehicle rear part structure shown in FIG. 1 deform | transforms. It is a graph which shows the relationship between the reaction force at the time of the rear surface collision shown in FIG. 1, and a stroke. It is a side view which shows the state which the pipe deform | transformed at the time of the rear surface collision in the vehicle rear part structure of a comparative example.

  Hereinafter, an embodiment of a vehicle rear structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  FIG. 1 shows a rear portion of a vehicle having a vehicle rear structure according to the present embodiment. FIG. 2 is a perspective view of the vehicle rear structure viewed from the front side of the vehicle, and FIG. 3 is a perspective view of the vehicle rear structure viewed from the vehicle rear side. FIG. 4 shows the vehicle rear structure in a cross section along the vehicle width direction. As shown in FIG. 1, a rear side member 12 extending along the vehicle front-rear direction is disposed on both sides of the vehicle lower portion 10 </ b> A of the vehicle 10 of the automobile. A crash box 14 is disposed at the rear end of the rear side member 12 in the vehicle front-rear direction so as to absorb an impact caused by a rear collision. A rear bumper reinforcement 16 extending along the vehicle width direction is disposed on the vehicle rear side of the crash box 14 on both sides of the vehicle 10. A rear bumper cover 18 is disposed along the vehicle width direction and the vehicle vertical direction on the vehicle rear side of the rear bumper reinforcement 16. The rear bumper cover 18 is attached to the rear end portion of the vehicle 10 by an attachment member (not shown).

  As shown in FIGS. 3 and 4, a rear floor panel 20 is disposed on the rear side member 12 along the vehicle width direction and the vehicle front-rear direction. The cross section along the vehicle width direction of the rear side member 12 is formed in a hat shape, and flange portions 12A and 12B are formed on both sides in the upper width direction. The rear side member 12 forms a closed cross section with the rear floor panel 20 by joining flange portions 12A and 12B on both sides in the width direction to the lower surface of the rear floor panel 20 by spot welding or the like.

  The rear floor panel 20 is formed with a recessed portion 20A that is recessed toward the vehicle lower side between the rear side members 12 on both sides (see FIG. 4). A seat cushion 50A constituting the rear seat 50 is disposed above the concave portion 20A.

  At both ends of the rear floor panel 20 in the vehicle width direction, flange portions 20B bent toward the vehicle upper side are formed. The rear side member 12 is formed with a bent portion 12C in which the end portion of the flange portion 12B on the outer side in the vehicle width direction is bent toward the vehicle upper side, and the bent portion 12C is disposed in a surface contact state on the flange portion 20B. . A wheel house 22 is disposed outside the rear side member 12 on both sides of the vehicle 10 in the vehicle width direction. A lower end portion 22A of the wheel house 22 is disposed in a surface contact state on the vehicle width direction outer side of the bent portion 12C of the rear side member 12, and the flange portion 20B, the bent portion 12C, and the lower end portion 22A are joined by welding or the like. Yes.

  As shown in FIGS. 1 to 4, the rear floor panel 20 on the upper side of the rear end of the rear side member 12 has a load input position at a position higher than the rear side member 12 at the time of a rear collision of the automobile. A gusset 30 is provided as a load receiving member that receives a load. The gusset 30 is formed in a substantially U shape whose cross section along the vehicle width direction is opened upward, a planar bottom surface portion 30A disposed in surface contact with the top surface of the rear floor panel 20, and the bottom surface An outer wall portion 30B bent from the vehicle width direction outer side end portion of the portion 30A to the vehicle upper side, and an inner wall portion 30C bent from the vehicle width direction inner end portion of the bottom surface portion 30A to the vehicle upper side.

  In addition, a pipe 34 as a bending deformation member that transmits a load to the rear side member 12 at the time of a rear collision and is capable of bending deformation is disposed above the rear floor panel 20 on the vehicle upper side of the rear side member 12. The pipe 34 is disposed along the vehicle front-rear direction from the gusset 30 to the vehicle front side. The rear end portion 34 </ b> A of the pipe 34 is in contact with the upper surface of the bottom surface portion 30 </ b> A of the gusset 30. A bracket 36 is disposed between the front end 34B of the pipe 34 and the rear floor panel 20 (see FIG. 3).

  The front end portion of the bottom surface portion 30A of the gusset 30 is formed to be shorter in the vehicle width direction than the rear end portion of the bottom surface portion 30A, and the vehicle width direction inner end portion at the front end portion of the bottom surface portion 30A A bent portion 30D that is bent upward is formed. The bent portion 30D is provided at a position in contact with the peripheral surface of the pipe 34, and the rear end of the pipe 34 is in a state where the rear end portion 34A of the pipe 34 is in contact with the outer wall portion 30B, the bottom surface portion 30A, and the bent portion 30D. The part 34A is joined to the gusset 30 by welding or the like (see FIGS. 6 and 7).

  As shown in FIGS. 4, 5, and 7, the bottom surface portion 30 </ b> A of the gusset 30 is formed with a bolt through hole 31 (see FIG. 6) at a position away from the vehicle front-rear direction. Bolts 38 are inserted into the bolt through holes 31 from above the vehicle. The bolt 38 is inserted into the bolt through hole 31 in the bottom surface portion 30A, the bolt through hole formed in the rear floor panel 20, and the bolt through hole formed in the rear side member 12, and the lower end portion 38A of the bolt 38 is inserted into the rear side. The nut 12 is screwed onto a lower surface of the member 12 that is fixed in advance. Thus, the gusset 30 is fastened and fixed to the rear side member 12 with the rear floor panel 20 interposed therebetween. A cylindrical tube portion 42 into which a bolt 38 is inserted along the vehicle vertical direction is disposed between the lower surface of the rear floor panel 20 and the upper surface of the rear side member 12. Further, a trim 52 is disposed along the vehicle vertical direction between the gusset 30 on both sides and the rear seat 50 in the vehicle width direction (see FIGS. 4 and 7).

  As shown in FIGS. 2 and 3, the rear end portion of the gusset 30 is provided with a connecting portion 32 that spans the outer wall portion 30 </ b> B and the inner wall portion 30 </ b> C along the vehicle vertical direction. In the present embodiment, the “load receiving member” when the automobile having a load input position higher than the rear side member 12 collides with the vehicle 10 from the rear is constituted by the gusset 30 and the connecting portion 32. The connecting portion 32 has a substantially U-shaped cross section along the vehicle width direction, and the outer end portion 32A of the connecting portion 32 is arranged in surface contact with the outer side of the outer wall portion 30B in the vehicle width direction. The inner end portion 32B is disposed in a surface contact state on the inner side in the vehicle width direction of the inner wall portion 30C, and the outer end portion 32A and the outer wall portion 30B, and the inner end portion 32B and the inner wall portion 30C are joined by welding or the like. As for the rear surface part 32C of the connection part 32, the lower end part inclines to the vehicle front side rather than the upper end part.

  As shown in FIGS. 2, 3, and 6, two cylinders spanned in the vehicle width direction between the outer wall portion 30 </ b> B and the inner wall portion 30 </ b> C at the vehicle front-rear direction intermediate portion of the gusset 30. Reinforcing portions 44 and 46 made of a pipe-like shape are disposed. The reinforcing portions 44 and 46 are spaced apart from each other on the upper and lower sides in the vehicle vertical direction. Both ends of the reinforcing portions 44 and 46 in the vehicle width direction are connected to the outer wall portion 30B and the inner wall portion 30C by welding or fastening and fixing, respectively.

  As shown in FIG. 3, a lower gusset 58 extending to the vehicle lower side is disposed on the lower side of the rear end portion of the gusset 30. The lower side gusset 58 includes side wall portions 58A and 58B disposed on both sides in the vehicle width direction, and the lower end portions of the side wall portions 58A and 58B are joined together by welding or the like, and are formed in a substantially V shape. The upper end portions of the side wall portions 58A and 58B are joined to both side surfaces of the rear side member 12 in the vehicle width direction by welding or the like.

As shown in FIGS. 2, 3, and 5, the front end portion 48 </ b> B has a downward slope on the inner side surface in the vehicle width direction of the outer wall portion 30 </ b> B of the gusset 30 with respect to the rear end portion 48 </ b> A in a vehicle side view. Thus, a fulcrum member 48 is provided as a bending deformation starting point providing member arranged in an oblique direction. The fulcrum member 48 has a substantially L-shaped cross section along the vehicle width direction, and a substantially straight corner 48C formed at the front end 48B is in contact with (or close to) the circumferential surface of the pipe 34. Arranged in a state. The wall portion 48D on the vehicle width direction outer side of the fulcrum member 48 is fastened and fixed to the outer wall portion 30B at two locations in the front-rear direction by bolts and nuts (not shown). The fulcrum member 48 transmits the load applied to the gusset 30 to the pipe 34 when the corner portion 48C contacts the peripheral surface of the pipe 34 at the time of rear collision of the automobile having a load input position higher than the rear side member 12. In addition, a starting point for bending deformation of the pipe 34 is provided.
Moreover, the mounting state of the fulcrum member 48 is stabilized by fastening and fixing the wall part 48D of the fulcrum member 48 to the outer wall part 30B at two locations in the front-rear direction with bolts and nuts (not shown).

  As shown in FIGS. 2, 3, 5, and 6, the bracket 36 is formed such that the rear end portion 36 </ b> A in the vehicle front-rear direction is shorter in the vehicle width direction than the front end portion 36 </ b> B. The rear end portion 36A and the front end portion 36B of the bracket 36 are formed in a substantially U shape in which a cross section along the vehicle width direction is opened upward. A front end portion 34B of the pipe 34 is inserted above the rear end portion 36A of the bracket 36, and a substantially U-shaped bottom surface portion of the rear end portion 36A and side surfaces on both sides in the vehicle width direction are the circumference of the front end portion 34B. Touching the surface. The front end portion 34B of the pipe 34 is joined to the rear end portion 36A of the bracket 36 by welding or the like.

  The front end portion 36B of the bracket 36 includes a bottom surface portion 36C disposed in a surface contact state on the upper surface of the rear floor panel 20, and a bolt through hole 37 (see FIG. 6) is formed in the bottom surface portion 36C. Bolts 38 are inserted into the bolt through holes 37 from the vehicle upper side of the bottom surface portion 36 </ b> C, and the bolts 38 are inserted into the bolt through holes formed in the rear floor panel 20 and the bolt through holes formed in the rear side member 12. The lower end 38 </ b> A of the bolt 38 is screwed into a nut 40 that is fixed to the lower surface of the rear side member 12 in advance. Thus, the bracket 36 is fastened and fixed to the rear side member 12 with the rear floor panel 20 interposed therebetween. Further, a cylindrical tube portion 42 into which a bolt 38 is inserted along the vehicle vertical direction is disposed between the lower surface of the rear floor panel 20 and the upper surface of the rear side member 12 (see FIG. 5).

  The pipe 34 is a cylindrical pipe and has a function for controlling a reaction force at the time of a rear collision. In the present embodiment, the reaction force value required for the input at the time of a rear collision of an automobile (for example, an automobile having a vehicle height higher than the vehicle 10) having a load input position higher than the rear side member 12 is calculated. It is controlled by the material.

As shown in FIG. 5, the center of the reinforcing portion 44 on the vehicle upper side and the corner portion 48 </ b> C of the fulcrum member 48 are in contact with or close to the peripheral surface of the pipe 34 (higher than the rear side member 12). A fulcrum member 48 is disposed along a line 54 connecting a portion where the load input position is located at a position where the rear face of the automobile collides with the pipe 34 and a starting point of bending deformation of the pipe 34. As a result, the load applied to the gusset 30 is efficiently transmitted to the reinforcing portion 44, the fulcrum member 48, and the pipe 34 at the time of a rear collision of the automobile having a load input position higher than the rear side member 12. ing.
In the present embodiment, the lower portion of the fulcrum member 48 is disposed along the line 54 in a side view of the vehicle. However, the vicinity of the center line in the longitudinal direction of the fulcrum member 48 is disposed along the line 54. It may be.

Further, the fulcrum member 48 includes a portion 32D where the rear end and upper end of the gusset 30 (connecting portion 32) intersect (a portion close to a position where a load is applied to the gusset 30), and a corner portion 48C of the fulcrum member 48 is a peripheral surface of the pipe 34. Is located along a straight line 56 that connects to or close to a position (a portion that is a starting point of bending deformation of the pipe 34 at the time of a rear-end collision of a vehicle having a load input position higher than the rear side member 12). . As a result, the load applied to the gusset 30 is easily transmitted to the pipe 34 via the fulcrum member 48 at the time of a rear collision of the automobile having a load input position higher than the rear side member 12.
In the present embodiment, the lower portion of the fulcrum member 48 is arranged along the straight line 56 in a side view of the vehicle, but the vicinity of the center line in the longitudinal direction of the fulcrum member 48 is arranged along the straight line 56. May be.
Further, the fulcrum member 48 has a portion 32D where the rear end and the upper end of the gusset 30 intersect (a portion close to a position where a load is applied to the gusset 30) and a corner portion 48C of the fulcrum member 48 is in contact with or close to the peripheral surface of the pipe 34. (The portion that becomes the starting point of bending deformation of the pipe 34 at the time of a rear collision) may be arranged on the vehicle lower side than the straight line 56 that connects the straight line 56 and the straight line 56.

  As shown in FIG. 1, the vehicle 10 of the present embodiment is a small vehicle, and a seat cushion 50 </ b> A of the rear seat 50 is disposed on the vehicle upper side of the pipe 34 in the rear portion 10 </ b> A of the vehicle 10. A seat back 50B is disposed on the vehicle upper side from the rear end of the seat cushion 50A. A passenger can be seated on the rear seat 50.

  Next, the operation and effect of this embodiment will be described.

  As shown in FIG. 1, when an automobile 60 having a load input position at a position higher than the rear side member 12 (for example, an automobile having a vehicle height higher than the vehicle 10) collides with the rear portion 10 </ b> A of the vehicle 10 (rear surface collision), A load is received by a gusset 30 disposed above the rear side member 12 in the vehicle. 8A, the load is transmitted from the gusset 30 to the pipe 34, and the load is transmitted to the rear side member 12 via the cylindrical portion 42 on the lower side of the gusset 30. . Further, the load transmitted to the pipe 34 is transmitted to the bracket 36 at the front end portion 34 </ b> B of the pipe 34, and is transmitted to the rear side member 12 via the cylinder portion 42 on the lower side of the bracket 36.

  Further, as shown in FIG. 8A, when the corner portion 48 </ b> C of the fulcrum member 48 contacts the pipe 34, the load acting on the gusset 30 is transmitted to the pipe 34 via the fulcrum member 48. Then, after a necessary reaction force is generated by the pipe 34, as shown in FIG. 8B, the contact of the corner portion 48C of the fulcrum member 48 and the pipe 34 becomes a deformation starting point, and the pipe 34 is bent. By deforming (bending deformation), the rear side member 12 is bent and deformed together with the pipe 34, so that the impact can be absorbed.

  More specifically, the gusset 30 is provided with a fulcrum member 48 to set a cross-sectional strength difference in the gusset 30, and the fulcrum member 48 absorbs energy while rotating with the corner portion 48 </ b> C of the fulcrum member 48 as a fulcrum. At this time, the straight corner portion 48C of the fulcrum member 48 contacts the peripheral surface of the pipe 34, stress concentration occurs at this contact portion, and the pipe 34 is bent and deformed. 34 bending positions can be controlled. Therefore, compared with the case where the rear side member of the prior art is deformed in the Z-shaped mode in a side view of the vehicle, the deformed portion of the pipe 34 and the rear side member 12 is set at a position away from the rear seat 50 (see FIG. 1) on the vehicle rear side. It is possible to suppress the impact from being transmitted to the rear seat 50.

  Further, as shown in FIG. 9, in the configuration provided with the gusset 30 and the fulcrum member 48 of the present embodiment, it is possible to absorb substantially the same energy as when the stroke is large with a small stroke at the time of rear collision.

  On the other hand, as shown in FIG. 10, when the gusset 30 is not provided with a fulcrum member, the bending deformation position of the pipe 34 cannot be controlled even if the gusset 30 provides a difference in cross-sectional strength with the pipe 34. There is a possibility that the pipe 34 cannot be bent and deformed at the street position. On the other hand, in this embodiment, the gusset 30 is provided with a fulcrum member 48, and the corner portion 48C of the fulcrum member 48 and the peripheral surface of the pipe 34 are brought into contact with each other, whereby the pipe 34 is bent and deformed at a target position. be able to.

  Furthermore, in this embodiment, as shown in FIG. 2 and FIG. 3 and the like, the reinforcing portions 44 and 46 are bridged over the outer wall portion 30B and the inner wall portion 30C of the gusset 30 along the vehicle width direction. The gusset 30 can be rigidized by the reinforcing portions 44 and 46 while suppressing the plate thickness of the gusset 30. For this reason, cost can be reduced compared with the case where the plate | board thickness of a gusset is thickened.

  Further, as shown in FIG. 5, the center of the reinforcing portion 44 on the vehicle upper side and the corner portion 48 </ b> C of the fulcrum member 48 are in contact with or close to the peripheral surface of the pipe 34 (from the rear side member 12). Further, a fulcrum member 48 is disposed along a line 54 connecting a portion where the load input position is located at a higher position and a portion where the pipe 34 bends at the rear collision). As a result, the load applied to the gusset 30 can be efficiently transmitted to the reinforcing portion 44, the fulcrum member 48, and the pipe 34 at the time of a rear collision of the automobile 60 having a load input position higher than the rear side member 12. . For this reason, the pipe 34 can be bent and deformed with a cheaper and simpler configuration.

  Further, the fulcrum member 48 includes a portion 32D where the rear end and upper end of the gusset 30 (connecting portion 32) intersect (a portion close to a position where a load is applied to the gusset 30), and a corner portion 48C of the fulcrum member 48 is a peripheral surface of the pipe 34. Are arranged along a substantially straight line 56 that connects to or close to a position (a portion that becomes a starting point of bending deformation of the pipe 34 at the time of a rear collision). This makes it easier for the load acting on the gusset 30 to be transmitted to the pipe 34 via the fulcrum member 48 at the time of a rear collision of the automobile 60 having a load input position higher than the rear side member 12.

  Further, as shown in FIG. 4, the pipe 34, the gusset 30 and the fulcrum member 48 of the rear portion 10A of the vehicle 10 of the present embodiment are housed between the trim 52 and the wheel house 22, so There is no need to extend the rear end portion of the vehicle 10 rearward or offset the position of the rear end portion of the rear side member to the vehicle upper side in order to suppress the transmitted impact, and the influence on the package of the vehicle 10 is small.

  The shape of the gusset 30 is not limited to the above embodiment and can be changed as long as it is a shape capable of receiving a load at the time of a rear collision of a vehicle having a load input position higher than the rear side member 12. . For example, it may have a substantially triangular shape or a substantially rectangular shape in a side view of the vehicle, or may have a shape that closes the opening at the upper end of the gusset 30.

In the above embodiment, the fulcrum member 48 has a substantially L-shaped cross section. However, the fulcrum member 48 is not limited to this, and the fulcrum member is a pipe at the time of a rear collision of the automobile having a load input position higher than the rear side member 12. Any shape can be used as long as it is in contact with 34 and can take the starting point of bending deformation. For example, a rectangular fulcrum member may be used.
Further, the corner portion 48C of the fulcrum member 48 may be in contact with the pipe 34 from the beginning, or the corner portion 48C of the fulcrum member 48 may be brought into contact with the pipe 34 later (at the time of rear collision).

  Moreover, in the said embodiment, although the fulcrum member 48 is arrange | positioned in the range of the outer wall part 30B of the gusset 30 by the vehicle side view (refer FIG. 5), a part of fulcrum member was couple | bonded with the gusset 30. The structure arrange | positioned in a state may be sufficient. For example, the rear end side of the fulcrum member is arranged in a state of being overlapped with the gusset 30 in a side view of the vehicle and is coupled to the gusset 30, and the front end portion of the fulcrum member is arranged on the vehicle front side with respect to the front end edge of the gusset 30. It may be configured. Further, the corner portion 48 </ b> C of the fulcrum member 48 may be disposed at a position that coincides with the front end edge of the gusset 30 in a vehicle side view.

  Furthermore, in the said embodiment, although the pipe 34 is cylindrical shape, it is not limited to this, The bending deformation member which consists of an elliptical or polygonal pipe, a rectangular long member, etc. may be sufficient.

  Furthermore, in the said embodiment, although the reinforcement parts 44 and 46 are cylindrical pipes, it is not limited to this, A polygonal pipe, a rectangular member, etc. may be sufficient.

10 vehicle 10A rear part 12 rear side member 30 gusset (load receiving member)
30B Outer wall (side wall)
30C Inner wall (side wall)
32 Connecting part (load receiving member)
32D Part where rear end and upper end intersect (rear end and upper end of load receiving member)
34 Pipe (bending deformation member)
44 Reinforcement part 48 Support point member (bending deformation starting point giving member)
48C Corner (contact part)
50 Rear seat 54 Line 56 Straight line 60 Automobile (vehicle having a load input position at a high position)

Claims (5)

Rear side members respectively extending along the vehicle longitudinal direction on both sides of the rear of the vehicle;
A load receiving member that is provided on a vehicle upper side of a rear end portion of the rear side member in the vehicle front-rear direction and receives a load at the time of a rear collision with a vehicle having a load input position at a position higher than the rear side member;
A bending deformation member that is disposed along the vehicle front-rear direction from the load receiving member to the vehicle front side on the vehicle upper side of the rear side member, transmits a load to the rear side member at the time of a rear collision, and is capable of bending deformation; ,
A bending deformation starting point providing member that is arranged in a state where a part thereof is coupled to the load receiving member, transmits a load acting on the load receiving member to the bending deformation member, and gives a starting point of bending deformation of the bending deformation member When,
I have a,
The bending deformation starting point imparting member is a vehicle rear portion structure having a contact portion that contacts a surface of the bending deformation member at least during bending deformation of the bending deformation member . The vehicle rear structure according to claim 1 , wherein the contact portion is a corner portion formed on the bending deformation starting point imparting member . The load receiving member is a vehicle rear portion structure according to claim 1 or claim 2 having a both side walls that are spaced apart in the vehicle width direction, and a reinforcement portion which is bridged to the opposite sides walls, the. The vehicle rear portion structure according to claim 3 , wherein the bending deformation starting point providing member is disposed along a line connecting the reinforcing portion and the starting point in a side view of the vehicle. The bending deformation starting point imparting member is disposed along a straight line connecting a rear end and an upper end of the load receiving member and the starting point, or disposed on a vehicle lower side than the straight line. Item 5. The vehicle rear structure according to any one of Items 4 to 4 .

Images