JP2009262660A - Vehicle body rear part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body rear part structure capable of efficiently absorbing impact load in a rear surface collision in a rear part range of a rear side member with extremely hardly affecting an occupant. <P>SOLUTION: This structure has a fold promoting member 41 having a mounting part 42 mounted by being extended in the longitudinal direction in a rear part of the rear side member 11 and a projecting part 43 formed by being extended downward from the mounting part 42, and a trailer hitch 30 having a trailer hitch bracket 31 provided with an abutting part 32 opposed to the projecting part 43. When impact load is inputted into the trailer hitch bracket 31 from a rear side, the abutting part 32 of the trailer hitch bracket 31 is abutted on the projecting part 43, a first bending inducing part 15 of the rear side member 11 corresponding to a front end of the mounting part 42 is bent and deformed. A distal end 43a of the projecting part 43 of the fold promoting member 41 oscillated according to bending and deformation of the first bending inducing part 15 is abutted on a second bending inducing part 16 of the rear side member 11 to bend and deform the second bending inducing part 16. As a result, the impact load is absorbed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body rear structure, and more particularly, to a vehicle body rear structure that absorbs an impact load by bending and deforming a rear side member at the time of a rear collision.

  In the rear structure of the vehicle body having a pair of rear side members extending in the front-rear direction along both sides of the vehicle body width direction, a technology that absorbs an impact load by controlling the bending deformation of the rear side member when the vehicle receives a rear collision. It has been known.

  Patent Document 1 proposes a vehicle body rear structure that absorbs an impact load by bending and deforming a rear side member at a plurality of locations when an impact load is input from the rear of the vehicle body. An outline of the vehicle body rear portion structure disclosed in Patent Document 1 will be described with reference to FIG.

  FIG. 8 is a side view showing a bent deformation state when the rear side member on which the fuel tank is disposed receives a rear collision. As shown in the figure, the rear side member 100 includes a front part 101 extending in the front-rear direction, an inclined part 103 extending obliquely upward from the rear end of the front part 101 via the first bent part 102, and an inclined part. A horizontal portion 105 that extends rearward from the rear end of the portion 103 via the second bent portion 104 is continuously formed. A fuel tank 106 is attached to the lower surface of the rear portion of the horizontal portion 105. A guide portion 109 is provided between the rear end portion 106 b and the rear end portion 110 of the fuel tank 106 in the rear side member 100, and a bumper 112 is attached to the rear end portion 110 via a bumper stay 111. The bumper 112 is attached so as to be offset downward from the axis of the rear side member 100.

  The rear side member 100 is formed in a U-shaped cross section with the upper part opened over the entire region. Further, the rear side member 100 has a discontinuous rigidity in the first bent portion 102, the second bent portion 104, and the portions 107 and 108 corresponding to the front end portion 106a and the rear end portion 106b of the fuel tank 106 due to a change in cross-sectional shape or the like. The change part which becomes becomes.

  As a result, the range of continuous rigidity due to the change in the cross-sectional shape of the rear side member 100 is the range from the front end portion 101a of the front portion 101 to the first bent portion 102, the range from the first bent portion 102 to the second bent portion 104, and the second. The range is from the bent portion 104 to the portion 107, from the portion 107 to the position 108, and from the portion 108 to the rear end portion 110 of the rear side member 100.

  According to this structure, when an impact load is input to the bumper 111 from the rear of the vehicle body, the bumper 112 is installed offset downward with respect to the axial center of the rear side member 100. The rear end portion 110 is pushed down to rotate. Therefore, the rear side member 100 is bent and deformed from the rear end portion 110 at the portion 108 where the rigidity changes first, and then bent and deformed at the portion 107 where the rigidity changes. When these portions 108 and 107 are bent and deformed, the front portion 105a of the horizontal portion 105 is lifted upward, and accordingly, the first bent portion 102 is bent and deformed.

JP-A-8-175421

  However, the rear side member structure described in Patent Document 1 is bent and deformed at a plurality of locations over a wide range from the rear end portion to the front portion of the rear side member, and the range of bending deformation due to input of an impact load is increased. There is a concern that it may affect passengers in the passenger compartment disposed above the rear side member. Similarly, there is a concern that the fuel tank disposed between the rear side members may be affected.

  Accordingly, an object of the present invention made in view of such a point is to provide a vehicle body rear structure that can efficiently absorb an impact load at the time of a rear collision in the rear range of the rear side member and has very little influence on an occupant or a fuel tank. There is to do.

  The vehicle body rear structure according to the first aspect of the present invention, which achieves the above object, is a vehicle body rear structure including a pair of rear side members extending in the front-rear direction along both sides in the vehicle width direction of the vehicle body. A rear end including an attachment portion extending in the front-rear direction and attached to the rear portion, a folding promoting member having a protrusion portion formed extending downward from the attachment portion, and a contact portion facing the protrusion portion And an impact load transmitting member that protrudes rearward from the rear end of the rear side member. When an impact load is input from the rear to the impact load transmitting member, the contact portion contacts the protruding portion and The first bending inducing portion of the rear side member corresponding to the front end of the mounting portion is bent and deformed, and the tip of the protruding portion of the bending promoting member that swings with the bending deformation of the first bending inducing portion is the first end. 1 bend Wherein the bent and deformed the portion in contact with the second bent inducing portion of the rear side members of the front of the raised portion.

  According to the present invention, the impact load is absorbed by the bending deformation of the first bending inducing portion corresponding to the front end of the mounting portion of the folding promoting member in the rear side member, and the large impact load that cannot absorb the shock absorption by the bending deformation of the first bending inducing portion. When is applied, the impact load is absorbed by bending and deforming the second bending inducing portion with which the tip of the protruding portion of the folding promoting member abuts. In particular, the collision load at the time of rear collision can be efficiently absorbed with an extremely short stroke due to the bending deformation of the first bending induction portion and the second bending induction portion at the rear portion of the rear side member. There is no effect, and safety can be improved. In addition, since the first bending inducing portion whose rigidity becomes discontinuous is formed by the attachment of the bending promoting member, and the second bending inducing portion is bent and deformed by the contact of the tip of the protruding portion, the bending of the rear side member can be stably performed. Obtainable. Furthermore, it is a simple structure which only attaches a folding promotion member, there are few structural members, and it can suppress manufacturing cost, aiming at weight reduction of a vehicle.

  A vehicle body rear structure according to a second aspect of the present invention is the vehicle rear structure according to the first aspect, wherein the rear side member has a cross-sectional shape extending in the front-rear direction having a bottom surface portion and both side surface portions, The fold-promoting member has a pair of sides having a side attachment portion that extends in the front-rear direction and is attached to both side portions of the rear side member, and a side protrusion that extends downward from the rear end of the side attachment portion. A folding member, a lower mounting portion extending in the front-rear direction and attached to the bottom surface of the rear side member, and a lower portion extending downward from the rear end of the lower mounting portion and coupled to the projecting portions on both sides And a lower fold promoting member having a protruding portion.

  According to the present invention, a rigid discontinuous portion is formed on each side surface portion of the rear side member by mounting the side mounting portion of the both-side folding promoting member, and a bottom surface portion of the rear side member by mounting the lower mounting portion of the lower folding promoting member. The first bending inducing portion is formed in which a discontinuous portion of rigidity is formed, and the discontinuity of rigidity is continuous between the side surface portions and the bottom surface portion of the rear side member. Therefore, there is no bias in the bending deformation of the first bending inducing portion, and it is possible to efficiently absorb the impact load input from the rear of the vehicle body. Thereby, the object of the invention according to claim 1 can be effectively achieved.

According to a third aspect of the present invention, the rear structure of the vehicle body is the rear structure of the vehicle body according to the first or second aspect, wherein the impact load transmitting member is attached to the rear end of each rear side member and faces the protruding portion. A pair of trailer hitch brackets disposed; a cross member constructed between the trailer hitch brackets;
It is a trailer hitch provided with a hitch ball which protrudes rearward from the center part in the vehicle width direction of the cross member and is supported.

  According to the present invention, the impact load transmitting member is constituted by the trailer hitch, and when receiving the impact load at the time of rear collision, it extends in the vehicle width direction between the trailer hitch brackets attached to the rear end of the rear side member. When an impact is input to the hitch ball provided in the center of the cross member to be mounted in the vehicle width direction, the trailer hitch bracket swings and abuts against the protrusion of the breakage promoting member to impact the impact load to the breakage promoting member. Transmit load.

  According to a fourth aspect of the present invention, there is provided the rear body structure of the vehicle body rear structure according to any one of the first to third aspects, wherein the rear side member includes a first bending induction portion and a second bending induction portion of the rear side member. A bead extending in the vehicle width direction is formed in the portion.

  According to the present invention, when a bending deformation occurs in the first bending inducing portion and the second bending inducing portion in the rear side member due to the impact load, the bead is formed in the portion, so that the bending deformation of the rear side member is ensured and the efficiency is improved. Can absorb impact load.

  According to the present invention, the impact load at the time of the rear collision can be efficiently absorbed by bending deformation in a very small range at the rear part of the rear side member, so that it does not affect the passengers and the fuel tank in the vehicle interior, Safety can be improved. In addition, since the first bending inducing portion whose rigidity becomes discontinuous is formed by the attachment of the bending promoting member, and the second bending inducing portion is bent and deformed by the contact of the tip of the protruding portion, the bending of the rear side member can be stably performed. Obtainable. Furthermore, since it is a simple structure which only attaches a folding promotion member, manufacturing cost can be suppressed, aiming at weight reduction of a vehicle.

  Next, an embodiment of a vehicle body rear structure according to the present invention will be described with reference to the drawings.

  1 is a perspective view showing an outline of a rear part of a vehicle body, FIG. 2 is a side view, and FIG. 3 is a perspective view showing an outline of a rear part of a rear member, a folding promoting member, and a trailer hitch bracket. As illustrated, the vehicle body rear portion 10 has a pair of left and right rear side members 11 extending in the vehicle longitudinal direction along both sides in the vehicle width direction of the vehicle body.

  Each rear side member 11 extends in the front-rear direction with a U-shaped cross-section with the side surfaces 11A and 11B and the bottom surface portion 11C open. The flanges 12 are bent along the upper end edges of the side portions 11A and 11B. The flange 12 is coupled to the lower surface of a floor panel (not shown).

  A pair of bumper stays 21 are attached to rear end portions 13 of the pair of rear side members 11 with a trailer hitch bracket 31 constituting a trailer hitch 30 serving as an impact load transmitting member described later interposed therebetween. A bumper beam 22 having a rectangular cross section extending in the vehicle width direction is installed. A bumper 23 is attached to the bumper beam 22 so as to extend in the vehicle width direction.

  A cross member 25 extending in the vehicle width direction and a rear suspension support subframe 26 for supporting the rear suspension are installed in front of the left and right rear side members 11. A fuel tank (not shown) is disposed between the left and right side members 11 in front of the cross member 25.

  The trailer hitch 30 is installed between the trailer hitch bracket 31 interposed between the rear end portions 13 of the left and right rear side members 11 and the bumper stays 21, and the left and right trailer hitch brackets 31 as shown in FIGS. A cross member 35 and a hitch ball 39 attached to protrude from the center of the cross member 35 in the vehicle width direction are provided.

  As shown in FIG. 3, the trailer hitch bracket 31 is joined to a flange (not shown) bent at the rear ends of the side surface portions 11A and 11B and the bottom surface portion 11C of the rear side member 11, and a contact portion 32 protruding downward. A rectangular plate-like bottom portion connecting the side portions 33A and 33B bent backward from both side edges of the contact portion 32 and the lower edge of the contact portion 32 and the lower edges of the side portions 33A and 33B. 33C is integrally formed, and is formed in a box shape having excellent rigidity with the upper and rear opened.

  Further, as shown in FIGS. 1 and 2, a cross member 35 having a rectangular cross section extending in the vehicle width direction is installed between the bottom portions 33 </ b> C of the left and right trailer hitch brackets 31. A hitch ball support arm 36 projects downward from the center of the cross member 35 in the vehicle width direction, and a support shaft 38 that supports the hitch ball 39 is mounted on a hitch support cylinder 37 disposed between the lower ends of the hitch support arm 36. Insert and attach. The hitch support cylinder 37 and the support shaft 38 are fixed by a locking pin or the like.

  On the other hand, a folding promoting member 41 having a mounting portion 42 extending in the front-rear direction at the rear portion of the rear side member 11 and a projecting portion 43 extending downward from the mounting portion 42 and facing the contact portion 32 of the trailer hitch bracket 31 is provided. It is attached.

  As shown in an exploded perspective view in FIG. 3, the folding promoting member 41 includes a pair of side folding promoting members 41A and 41B and a lower folding promoting member 41C.

  The side-folding promoting member 41A extends downward from the rear end of the side-side mounting portion 42A and a plate-like side-side mounting portion 42A that extends in the front-rear direction and is coupled to the rear portion of the side surface 11A of the rear side member 11. The side protrusion 43A is provided with a flange 43Aa that is continuously bent in the vertical direction. Similarly, the side fold promoting member 41B extends downward from the rear ends of the plate-like side attachment portion 42B and the side attachment portion 42B that extend in the front-rear direction and are coupled to the rear portion of the side surface 11B of the rear side member 11. The side protrusion 43B is provided with a flange 43Ba that is bent continuously in the vertical direction. Mounting holes 42Aa and 42Ba corresponding to the mounting holes 11Aa and 11Ba formed in the side surfaces 11A and 11B of the rear side member 11 are formed in the side mounting portions 42A and 42B of the side-folding promotion members 41A and 41B. Is done.

  The lower folding promoting member 41C extends in the front-rear direction to the rear portion of the bottom surface portion 11C of the rear side member 11 and is joined to be bent downward from the rear end of the lower mounting portion 42C. A rectangular plate has a lower protrusion 43C, and flanges 43Ca and 43Cb are formed on both sides of the lower protrusion 43C. A mounting hole 42Ca is formed in the lower mounting portion 42C of the lower folding promoting member 41C corresponding to a mounting hole (not shown) formed in the bottom surface portion 11C of the rear side member 11.

  The flange 43Ca formed on the lower protrusion 43C of the lower fold promoting member 41C thus configured and the side protrusion 43A of the side fold promoting member 41A are overlapped and joined together, and the lower protrusion of the lower fold promoting member 41C is combined. The flange 43Cb formed in the portion 43C and the side protrusion 43B of the side fold promoting member 41B are overlapped and joined to integrate the left and right side fold promoting members 41A and 41B and the lower fold promoting member 41C. As a result, the attachment portions 42 connected to the rear side member 11 are formed by the side attachment portions 42A and 42B and the lower attachment portion 42C, and the protrusions 43 are formed by the side protrusions 43A and 43B and the lower protrusion 43C that are connected to each other. The formed folding promotion member 41 is configured.

  These side fold promoting members 41A and 41B and the lower fold promoting member 41C have a relatively simple shape, have good workability and can be easily manufactured, and can be easily formed by joining them together. Excellent productivity can be secured.

  The folding promoting member 41 is positioned by superimposing the side attachment portions 42A and 42B on the side surfaces 11A and 11B of the rear side member 11, and superposing the lower attachment portion 42C on the bottom surface portion 11C and fitting it to the rear side member 11. . The side mounting portion 42A and the side surface 11A of the rear side member 11 that are overlapped with each other are connected by mounting bolts or the like that are inserted into the mounting holes 42Aa and 11Aa, and the side mounting portion 42B and the side surface 11B are inserted into the mounting holes 42Ba and 11Ba. The lower mounting portion 42C and the bottom surface portion 11C are connected by mounting holes formed in the bottom surface portion 11C and mounting bolts inserted in the 42Ca.

  The protruding portion 43 of the folding promoting member 41 attached to the rear side member 11 is disposed to face the contact portion 42 of the trailer hitch bracket 31 with a slight gap.

  On the other hand, the rear side member 11 to which the folding promoting member 41 is attached has the side surface portions 11A and 11B and the bottom surface portion 11C which are rigid due to the attachment of the side mounting portions 42A and 42B and the lower mounting portion 42C of the folding promoting member 41. Increases, and a rigid discontinuous portion is formed along the front end edges of the side attachment portions 42A and 42B and the lower attachment portion 42C. This discontinuous portion of rigidity becomes the first bending inducing portion 15 that is bent by an impact load described later. Corresponding to the first bending induction portion 15, a bead 15 a continuous in the vehicle width direction is formed on each flange 12.

  Furthermore, the portion of the rear side member 11 where the tip 43a of the protrusion 43 of the folding promoting member 41 that swings with the bending of the first bending inducing portion 15 described later is in front of the first bending inducing bending portion 15 is the second. A groove-like bead 16a extending in the vehicle width direction is formed on the lower surface of the bottom surface portion 11C corresponding to the second bending induction portion 16.

  Next, with reference to FIG. 2 and FIGS. 4 to 6, the impact absorbing action by the vehicle body rear portion 10 when an impact load is applied to the vehicle body rear portion 10 configured as described above due to a rear surface collision or the like such as a rear-end collision. The description will be given with reference.

  FIG. 2 shows a normal state of the vehicle body rear portion 10. In this normal state, when a collision such as a rear collision such as a rear-end collision by a vehicle traveling from behind occurs, the hitch starts from the center in the vehicle width direction of the cross member 35 of the trailer hitch 30 attached to the rear body 10 of the vehicle body. The vehicle collides with a hitch ball 39 that is suspended via the ball support arm 36 and is projected rearward by the support shaft 38.

  As a result of this collision, an impact load P is input to the hitch ball 39 from the rear, and as shown in FIG. 4, the hitch ball 39 is pushed forward by the input of the impact load, and the hitch ball support arm 36 swings forward. The swinging hitchball support arm 36 pushes the bottom 33C of the trailer hitch bracket 31 forward through the cross member 35, and the trailer hitch bracket 31 swings forward. Is formed by side protrusions 43A and 43B and a lower protrusion 43C of the folding promoting member 41 extending downward from the rear side member 11, and abuts against the protrusion 43.

  Similarly, a trailer hitch bracket that protrudes rearward from the rear end 13 of the rear side member 12 without abutting the hitch ball 39 in the event of an offset collision in which the rear-end vehicle deviates from the hitch ball 39 in the vehicle width direction. It collides with the lower rear end of 31, for example, the rear end 33Ca of the bottom 33C or the end portion of the cross member 35. Due to this collision, the trailer hitch bracket 31 swings forward, and the contact surface 32 of the trailer hitch bracket 31 contacts the protruding portion 42 of the folding promoting member 41 extending downward from the rear side member 11.

  Due to these collisions, the trailer hitch bracket 31 is swung by an impact load, and the abutting surface 32 abuts on the projecting portion 42 to push the projecting portion 42. The rear side frame 11 in which the mounting portion 42 is coupled to the impact load input to the protruding portion 42 with the pushing motion applied to the protruding portion 42, more specifically, the side mounting portions 42A and 42B. The load is transmitted to the side surface portions 11A and 11B and the bottom surface portion 11C to which the lower mounting portion 43C and the lower mounting portion 43C are coupled, respectively, and formed by rigid discontinuous portions along the front end edges of the side mounting portions 42A and 42B and the lower mounting portion 42C. The first bending inducing portion 15 is bent and deformed so that the rear end portion 13 side of the rear side member 11 is pushed downward. Due to the bending deformation of the first bent portion 15, the impact load input to the rear side member 11 is efficiently absorbed to reduce the impact. In the bending deformation of the first bending inducing portion 15, the rigid discontinuous portions formed on the side surface portions 11A and 11B of the rear side member 11 by the attachment of the side portion attaching portions 42A and 42B of the both side portion folding promoting members 41A and 41B. Further, by attaching the lower mounting portion 42C of the lower folding promoting member 41C, the rigid discontinuous portion formed on the bottom surface portion 11C of the rear side member 11 is continuous, and the bending deformation of the first bending inducing portion 15 is not biased. Since the bead 15a is formed in each flange 12 corresponding to the 1 bending induction part 15, it bends and deforms reliably in the 1st bending induction part 15, and an impact load can be absorbed efficiently.

  Further, when the impact load input to the trailer hitch bracket 31 is large and the impact load cannot be sufficiently absorbed by the bending deformation of the first bend induction portion 15 of the rear side member 11, the trailer hitch bracket 31 moves forward relatively. 5, the projection 43 of the folding promoting member 41 swings forward with the bending deformation of the first bending inducing portion 15, and the tip 43 a of the projection 43 becomes the first side of the rear side member 11 as shown in FIG. 5. The second bend inducing portion 16 abuts on the bead 16a formed on the bottom surface portion 11C, and the second bend inducing portion 16 is pushed up by the impact load input from the trailer hitch bracket 31 to bend and deform. The bending deformation of the second bending inducing portion 16 efficiently absorbs the impact load and relaxes the impact. When the second bending induction portion 16 is bent and deformed, the tip 43a of the protruding portion 43 is locked to the bead 16a formed on the bottom surface portion 11C corresponding to the second bending induction portion 16, so The load is transmitted to the second bending induction portion 16 and the first bending induction portion 15 is surely bent and deformed.

  When the impact load input to the trailer hitch bracket 31 is larger and the impact load cannot be sufficiently absorbed even in the bending deformation of the first bending induction portion 15 and the second bending induction portion 16 of the rear side member 11, FIG. As shown, the cross member 35 installed on the bottom portion 33C of the trailer hitch bracket 31 abuts against the bottom surface portion 11c of the rear side member 11 and receives the cross member 35 by the rear side member 11, thereby allowing the rear side member 11 to pass through the trailer hitch bracket 31. The rear part is prevented from deforming and the influence on the passenger compartment is suppressed.

  Therefore, according to the present embodiment configured as described above, when an impact load is input from the rear, such as a rear collision, the impact is caused by the bending deformation of the first bending inducing portion 15 in the rear range of the rear side member 11. When the load is absorbed and the impact load cannot be sufficiently absorbed by the bending deformation of the first bending induction portion 15 with a large impact load, the impact load is efficiently absorbed by the bending deformation of the second bending induction portion 16. The impact load is efficiently absorbed with an extremely short stroke at the rear portion of the rear side member 11, and the influence on the passenger compartment is extremely small, so that the safety of the passenger can be ensured. Similarly, the fuel tank disposed between the rear side members 11 is protected, fuel leakage is prevented, and safety is improved.

  In addition, the first bending guiding portion 15 and the second bending guiding portion 16 that absorb impact loads by bending deformation without increasing the number of constituent members with a simple configuration in which the folding promoting member 41 is attached to the rear side member 11 are set. It is possible to efficiently absorb the impact load while reducing the weight and further reduce the manufacturing cost.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the rear body member structure including the rear side member 11 having a U-shaped cross section including the side surface portions 11A11B and the bottom surface portion 11C has been described as an example, but the present invention is applied to the rear vehicle body structure including the rear side member having a rectangular cross section. can do. Moreover, in the said embodiment, although the folding promotion member 41 was formed by the side part folding promotion members 41A and 41B and the lower part folding promotion member 41C, these side part folding promotion members 41A and 41B and the lower part folding promotion member 41C are integrally formed. In addition, as shown in FIG. 7 (a), it is also possible to configure the folding promoting member 41 by one side folding promoting member 41A or 41B and the lower folding promoting member 41C, as shown in FIG. 7 (b). As shown in FIG. 5, the folding promoting member 41 can be formed only by the lower folding promoting member 41C.

  Further, the position of the second bent portion 16 can be changed and adjusted by changing the length of the tip 43a of the protruding portion 43 protruding from the bottom surface portion 11C of the rear side frame 11 according to the specification or the like.

  In the above embodiment, the trailer hitch 30 is used as the impact load transmitting member. However, the rear end protrudes rearward from the rear end of the rear side member 11, and the protruding portion 43 of the breakage promoting member 41 in the case of a rear collision. It can be constituted by other members such as a sub-bumper.

It is a perspective view showing the outline of the body rear part structure concerning one embodiment of the present invention. Similarly, it is a side view which shows the outline | summary of a vehicle body rear part structure. Similarly, it is a perspective view which shows the outline | summary of the rear part of a rear rhi member, a folding promotion member, and a trailer hitch bracket. It is an action explanatory view showing the outline of the shock absorption action by the rear part of the vehicle body. It is an action explanatory view showing the outline of the shock absorption action by the rear part of the vehicle body. It is an action explanatory view showing the outline of the shock absorption action by the rear part of the vehicle body. It is a figure which shows the other example of a folding promotion member. It is a side view which shows the outline of the conventional vehicle body rear part structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Car body rear part 11 Rear side member 11A, 11B Side surface part 11C Bottom face part 12 Flange 15 1st bending induction part 15a Bead 16 2nd bending induction part 16a Bead 30 Trailer hitch (impact load transmission member)
31 Trailer hitch bracket 32 Abutting portion 35 Cross member 39 Hitch ball 41 Folding promoting member 42 Mounting portion 43 Protruding portion 41A Side folding promoting member 42A Side portion attaching portion 43A Side protruding portion 41B Side portion folding promoting member 42B Side portion attaching Part 43B Side protrusion 41C Lower fold promoting member 42C Lower attachment part 43C Lower protrusion

Claims (4)

In the vehicle body rear structure including a pair of rear side members extending in the front-rear direction along both sides in the vehicle width direction of the vehicle body,
A fold-promoting member having a mounting portion extending in the front-rear direction and attached to the rear portion of the rear side member, and a projecting portion formed extending downward from the mounting portion;
An impact load transmitting member provided with an abutting portion facing the projecting portion and a rear end portion projecting rearward from the rear end of the rear side member;
When an impact load is input from the rear to the impact load transmission member, the abutting portion comes into contact with the protruding portion, and the first bending inducing portion of the rear side member corresponding to the front end of the mounting portion is bent and deformed. The tip of the projecting portion of the folding promoting member that swings with the bending deformation of the first bending inducing portion abuts on the second bending inducing portion of the rear side member in front of the first bending inducing portion. A vehicle body rear structure characterized by bending and deforming. The rear side member is
It has a cross-sectional shape extending in the front-rear direction with a bottom surface portion and both side surface portions,
The folding promoting member is
A pair of side fold promoting members having side attachment portions extending in the front-rear direction on both side portions of the rear side member and side protrusions formed extending downward from the rear ends of the side attachment portions. When,
A lower fold having a lower mounting portion extending in the front-rear direction and attached to the bottom surface portion of the rear side member, and a lower protruding portion extending downward from a rear end of the lower mounting portion and coupled to the both side protruding portions. A facilitating member;
The vehicle body rear structure according to claim 1, further comprising: The impact load transmission member is
A pair of trailer hitch brackets attached to the rear ends of the rear side members and arranged to face the protrusions;
A cross member erected between the trailer hitch brackets;
The vehicle body rear structure according to claim 1 or 2, wherein the cross member is a trailer hitch provided with a hitch ball that protrudes rearward from a central portion in the vehicle width direction of the cross member and is supported. The rear side member is
The vehicle body rear part structure according to any one of claims 1 to 3, wherein a bead extending in a vehicle width direction is formed in the first bend inducing portion and the second bend inducing portion of the rear side member. .

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