JP2017043176A - Vehicle rear body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle rear body structure capable of inhibiting deformation of a bracket for connecting a trailing arm with a rear side member.SOLUTION: A bracket 20 supporting a trailing arm includes: a first coupling wall 21 coupled to an inner side wall 142 of a rear side member 10; a second coupling wall 22 coupled to an outer side wall 143 of the rear side member 10; a connecting part 23 which connects a front end lower portion of the first coupling wall 21 with a front end lower portion of the second coupling wall 22 to each other; a bottom wall coupling part 24 which protrudes from the connecting part 23 to a vehicle front side and is coupled to a bottom wall 141 of the rear side member 10; and a support shaft 25 connected to the first coupling wall 21 and the second coupling wall 22 and rotatably supporting the trailing arm. A reinforcement 40 which is coupled to the first coupling wall 21, the second coupling wall 22, the connecting part 23, and the bottom wall 141 are provided between the first coupling wall 21 and the second coupling wall 22.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle rear body structure in which a trailing arm is supported by a rear side member via a bracket.

  In the rear body structure of the vehicle described in Patent Document 1, a pair of rear side members are arranged on both sides in the vehicle width direction. These rear side members respectively support the trailing arms so as to be rotatable via brackets. An intermediate beam extending in the vehicle width direction is connected to the pair of trailing arms supported by the rear side member. When the road surface reaction force is input to the wheel and the wheel moves up and down with respect to the vehicle body when the vehicle is traveling, the trailing arm connected to the wheel rotates around the supporting part of the trailing arm in the bracket. It comes to move.

JP 2010-167883 A

  By the way, due to the road surface reaction force being input to the wheels, when the trailing arm rotates, the front-rear direction position of the wheels is displaced rearward of the vehicle or forward of the vehicle. Therefore, when a road surface reaction force is input to the wheel, a force that pulls the vehicle rearward and a force that pushes the vehicle frontward are input to the bracket from the trailing arm.

  Further, the pair of trailing arms are connected via an intermediate beam. Therefore, not only the force from one trailing arm but also the force from the other trailing arm is input through the intermediate beam to the bracket that supports one of the trailing arms. That is, the resultant force of the force from one trailing arm and the force from the other trailing arm is input to the bracket, but this combined force is not only the force of the component in the vehicle longitudinal direction but also the vehicle width. It also includes the force of the direction component.

  When a relatively large road surface reaction force is repeatedly input to the wheels, such as when the vehicle travels on a rough road, the resultant force input to the bracket through the trailing arm increases. When such a large resultant force is repeatedly input to the bracket, the bracket may be deformed so as to fall inward or outward in the vehicle width direction.

  An object of the present invention is to provide a rear body structure of a vehicle that can suppress deformation of a bracket for connecting a trailing arm to a rear side member.

  In the rear body structure of the vehicle for solving the above-described problem, the trailing arm is rotatably supported by the rear side member via the bracket. The rear side member has a bottom wall, an inner wall connected to the inner end of the bottom wall in the vehicle width direction, and an outer wall connected to an outer end of the bottom wall in the vehicle width direction. The bracket includes a first coupling wall extending downward in the vehicle vertical direction from a coupling site with the inner side wall, and a second coupling wall extending downward in the vehicle vertical direction from a coupling site with the outer wall. A connecting portion that connects a front end of the first connecting wall in the vehicle front-rear direction and a front end of the second connecting wall in the vehicle front-rear direction, and projects from the connecting portion forward of the vehicle and is connected to the bottom wall. A bottom wall coupling portion and a support portion that is connected to the first coupling wall and the second coupling wall and supports the trailing arm in a rotatable manner. Further, between the first coupling wall and the second coupling wall of the bracket, the bracket is coupled to the first coupling wall, the second coupling wall and the connecting portion of the bracket, and the bottom wall of the rear side member. Reinforcement is provided.

  According to the said structure, the 1st coupling wall of the bracket is connected to the 2nd coupling wall and the connection part, and the bottom wall of the rear side member via the reinforcement. Similarly, the 2nd coupling wall of a bracket is connected to the 1st coupling wall and the connection part, and the bottom wall of the rear side member via the reinforcement. In this way, the rigidity of the bracket is increased by the reinforcement, so that even if force is input from the trailing arm to the first coupling wall and the second coupling wall through the support portion, the inside and outside in the vehicle width direction Deformation of the first coupling wall and the second coupling wall that fall into the position is difficult to occur. Accordingly, deformation of the bracket for connecting the trailing arm to the rear side member can be suppressed.

The side view which shows typically one Embodiment of the rear part body structure of a vehicle. The top view which shows typically a pair of trailing arm and its peripheral member in the rear part body structure of the vehicle. Sectional drawing which shows typically a rear side member, a bracket, and reinforcement in the rear part body structure of the vehicle. The perspective view which shows reinforcement and its peripheral member in the rear part body structure of the vehicle. The perspective view which shows reinforcement in the rear part body structure of the vehicle. Sectional drawing which shows typically a rear side member, a bracket, and reinforcement in the rear part body structure of the vehicle.

Hereinafter, an embodiment embodying a rear body structure of a vehicle will be described with reference to FIGS.
As shown in FIG. 1, the rear body structure of the vehicle includes a pair of rear side members 10 disposed on both sides in the vehicle width direction, which is a direction orthogonal to the paper surface in FIG. In FIG. 1, one of the pair of rear side members 10 is illustrated. These rear side members 10 are each provided with a first member portion 11 and a second member portion 12 that extend in the vehicle longitudinal direction. The second member portion 12 is located behind the first member portion 11 and above the vehicle. The rear end of the first member portion 11 and the front end of the second member portion 12 are connected via a kick portion 13. Brackets 20 are respectively attached to the kick portions 13, and these brackets 20 support the trailing arms 30 so as to be rotatable.

  As shown in FIGS. 1 and 2, the pair of trailing arms 30 extends substantially in the vehicle front-rear direction. The front ends 301 of these trailing arms 30 have a cylindrical shape and are supported by the bracket 20. Further, an intermediate beam 31 extending in the vehicle width direction is connected to an intermediate position in the longitudinal direction of both trailing arms 30. That is, both trailing arms 30 are connected by the intermediate beam 31. Further, a lower end of the shock absorber 32 and a hub carrier 33 are attached to the rear ends 302 of the trailing arms 30. Therefore, when the road surface reaction force is input to the wheel 34 connected to the hub carrier 33, the trailing arm 30 moves in the bracket 20 in accordance with the vertical movement of the wheel 34 with respect to the vehicle body. It is designed to rotate around the support portion 301.

  As shown in FIG. 3, the rear side member 10 includes a bottom wall 141, an inner wall 142 connected to an inner end portion of the bottom wall 141 in the vehicle width direction, and an outer end of the bottom wall 141 in the vehicle width direction. And an outer wall 143 connected to the section. Both the inner side wall 142 and the outer side wall 143 extend upward in the vehicle vertical direction from the connection portion with the bottom wall 141.

  As shown in FIGS. 3 and 4, the bracket 20 has a pair of coupling walls 21 and 22 arranged on both sides of the rear side member 10 in the vehicle width direction. The upper part of the first coupling wall 21 located on the inner side in the vehicle width direction of both the coupling walls 21 and 22 is coupled to the inner wall 142 of the rear side member 10 by welding or the like. Moreover, the upper part of the 2nd coupling wall 22 located in the outer side in the vehicle width direction among both the coupling walls 21 and 22 is couple | bonded with the outer side wall 143 of the rear side member 10 by welding. In addition, the part of “x” in FIG. 3 corresponds to the binding part. The first connecting wall 21 extends downward from the connecting portion with the inner wall 142 in the vertical direction of the vehicle, and the second connecting wall 22 extends downward from the connecting portion with the outer wall 143 in the vertical direction of the vehicle. It is extended.

  The bracket 20 includes a connecting portion 23 that connects the lower front end of the first connecting wall 21 and the lower front end of the second connecting wall 22, and a bottom wall connecting portion that protrudes forward from the upper end of the connecting portion 23 to the vehicle. 24 is provided. The bottom wall coupling portion 24 is in surface contact with the bottom wall 141 of the rear side member 10 and is coupled to the bottom wall 141 by welding or the like. In addition, the coupling | bond part to the bottom wall 141 in the bottom wall coupling | bond part 24 is also shown by "x" in FIG. 6 mentioned later.

  It should be noted that the front ends of both the first coupling wall 21 and the second coupling wall 22 are inclined so as to be located at the rear of the vehicle as they are farther from the bottom wall 141 of the rear side member 10 in the vehicle vertical direction. For this reason, the connecting portion 23 of the bracket 20 also has a shape that is inclined so as to be located at the rear of the vehicle as the portion is spaced downward from the connecting portion with the bottom wall coupling portion 24.

  In addition, the bracket 20 is provided with a support shaft 25 as a support portion that is disposed at a position behind the connecting portion 23 and behind the vehicle. The support shaft 25 extends in the vehicle width direction, one end of the support shaft 25 is fixed to the first coupling wall 21, and the other end of the support shaft 25 is fixed to the second coupling wall 22. The front end 301 of the trailing arm 30 is supported on the support shaft 25. That is, the trailing arm 30 is rotatable about the support shaft 25 of the bracket 20.

  Further, as shown in FIGS. 4 and 5, in the rear body structure of the vehicle according to the present embodiment, a reinforcement 40 for increasing the rigidity of the bracket 20 is provided. The reinforcement 40 is disposed in a space between the first coupling wall 21 and the second coupling wall 22 of the bracket 20 and between the support shaft 25 and the bottom wall 141 of the rear side member 10. Has been.

  As shown in FIGS. 3 and 5, the reinforcement 40 includes a first contact surface portion 41 that contacts the first coupling wall 21 of the bracket 20 and a second contact that contacts the second coupling wall 22 of the bracket 20. The contact surface portion 42 is provided. The first contact surface portion 41 is coupled to the first coupling wall 21 by welding or the like, and the second contact surface portion 42 is coupled to the second coupling wall 22 by welding or the like. In FIG. 6, the bonding site to the first bonding wall 21 in the first contact surface portion 41 is indicated by “x”.

  As shown in FIGS. 5 and 6, the reinforcement 40 includes a bottom wall contact surface portion 43, an intermediate portion disposed between the first contact surface portion 41 and the second contact surface portion 42 in the vehicle width direction. A portion 45 and a connecting contact surface portion 44 are provided. The bottom wall contact surface portion 43, the intermediate portion 45, and the connection contact surface portion 44 are connected to both the first contact surface portion 41 and the second contact surface portion 42, respectively. Further, the bottom wall contact surface portion 43 is located behind the intermediate portion 45, and the front end of the bottom wall contact surface portion 43 is connected to the rear end of the intermediate portion 45. The bottom wall contact surface portion 43 is in surface contact with the bottom wall 141 of the rear side member 10 and is coupled to the bottom wall 141 by welding or the like. In FIG. 6, the portion of the bottom wall contact surface portion 43 that is bonded to the bottom wall 141 is indicated by “x”.

  Although the intermediate portion 45 is positioned in front of the vehicle with respect to the bottom wall contact surface portion 43, the intermediate portion 45 is positioned in the rear of the vehicle with respect to the connection contact surface portion 44. That is, the rear end of the connecting contact surface portion 44 is connected to the front end of the intermediate portion 45. Such a middle portion 45 is farther from the bottom wall 141 of the rear side member 10 at a position located in front of the vehicle. The connection contact surface portion 44 contacts the rear surface 231 of the connection portion 23 of the bracket 20 and is connected to the center of the connection portion 23 in the vehicle width direction by welding or the like. In FIG. 6, the coupling site to the coupling portion 23 in the coupling contact surface portion 44 is indicated by “x”.

Next, the effect | action of the rear part body structure of the vehicle of this embodiment is demonstrated.
In the rear body structure of the vehicle according to the present embodiment, the rigidity of the bracket 20 is enhanced by the reinforcement 40. That is, both the first coupling wall 21 and the second coupling wall 22 near the support shaft 25 are connected to the bottom wall 141 of the rear side member 10 via the reinforcement 40. Further, both of the first connecting wall 21 and the second connecting wall 22 near the support shaft 25 are also connected to the connecting portion 23 of the bracket 20 via the reinforcement 40.

  When the inward force in the vehicle width direction is input from the trailing arm 30 to the support shaft 25 of the bracket 20, the first coupling wall 21 of the bracket 20 is pushed by the support shaft 25 and the vehicle width. Try to displace inward in the direction. Further, the second coupling wall 22 of the bracket 20 is pulled by the support shaft 25 and tends to be displaced inward in the vehicle width direction. At this time, the inward deformation of the coupling walls 21 and 22 in the vehicle width direction is suppressed by the reinforcement 40.

  In addition, when an outward force in the vehicle width direction is input from the trailing arm 30 to the support shaft 25 of the bracket 20, the first coupling wall 21 of the bracket 20 is pulled by the support shaft 25 and the vehicle width. Try to displace outward in the direction. Further, the second coupling wall 22 of the bracket 20 is pushed by the support shaft 25 and tends to be displaced inward in the vehicle width direction. Even in such a case, the outward deformation in the vehicle width direction of each of the coupling walls 21 and 22 is suppressed by the reinforcement 40.

As mentioned above, according to the said structure and effect | action, the effect shown below can be acquired.
(1) The rigidity of the bracket 20 that supports the trailing arm 30 is increased by providing the reinforcement 40. Thereby, even if a force in the vehicle width direction is applied to the first coupling wall 21 and the second coupling wall 22 of the bracket 20, the first coupling that falls down inside or outside in the vehicle width direction. Deformation of the wall 21 and the second coupling wall 22 is suppressed. Therefore, deformation of the bracket 20 can be suppressed.

  (2) The reinforcement 40 is disposed in the dead space between the first coupling wall 21 and the second coupling wall 22 of the bracket 20. Therefore, the deformation of the bracket 20 can be suppressed while effectively utilizing the dead space.

The above embodiment may be changed to another embodiment as described below.
-You may make it contact the connection contact surface part 44 of the reinforcement 40 with the front surface located in the connection part 23 of the bracket 20 on the opposite side to the rear surface 231. FIG. Even in this case, an effect equivalent to that of the above embodiment can be obtained by coupling the coupling contact surface portion 44 to the coupling portion 23.

  DESCRIPTION OF SYMBOLS 10 ... Rear side member, 141 ... Bottom wall, 142 ... Inner side wall, 143 ... Outer wall, 20 ... Bracket, 21 ... First coupling wall, 22 ... Second coupling wall, 23 ... Connection part, 24 ... Bottom wall coupling Part, 25 ... support shaft, 30 ... trailing arm, 40 ... reinforcement.

Claims (1)

A rear body structure of a vehicle in which a trailing arm is rotatably supported by a rear side member via a bracket,
The rear side member has a bottom wall, an inner wall connected to the inner end of the bottom wall in the vehicle width direction, and an outer wall connected to an outer end of the bottom wall in the vehicle width direction. And
The bracket includes a first coupling wall extending downward in the vehicle vertical direction from a coupling site with the inner wall, and a second coupling wall extending downward in the vehicle vertical direction from the coupling site with the outer wall. A connecting portion connecting the front end of the first connecting wall in the vehicle front-rear direction and the front end of the second connecting wall in the vehicle front-rear direction, and protruding from the same connecting portion to the front of the vehicle and connected to the bottom wall A bottom wall coupling portion, and a support portion connected to the first coupling wall and the second coupling wall and rotatably supporting the trailing arm,
Between the first coupling wall and the second coupling wall of the bracket, the first coupling wall, the second coupling wall and the connecting portion of the bracket, and the bottom of the rear side member Rear body structure of a vehicle, characterized in that there is a reinforcement connected to the wall.

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