JP6489035B2 - Vehicle rear structure - Google Patents

Description

  The present invention relates to a vehicle rear structure.

  The following Patent Document 1 discloses a vehicle rear portion structure. The rear structure of the vehicle includes a pair of left and right rear side members provided at both ends of the rear floor pan in the vehicle width direction, a rear cross member that connects a vehicle front-rear direction intermediate portion of the pair of left and right rear side members in the vehicle width direction, A rear suspension member disposed on the vehicle crosswise lower side of the rear cross member. The vehicle rear structure transmits a collision load input at the time of a vehicle rear surface collision to the vehicle front side along the rear side member.

JP 2010-247622 A

  However, in the configuration disclosed in Patent Document 1, since the collision load concentrates only on the rear side member that is the skeleton of the vehicle at the time of a vehicle rear surface collision, there is a possibility that body deformation cannot be suppressed. Therefore, the above prior art has room for improvement in this respect.

  In view of the above problems, an object of the present invention is to obtain a vehicle rear structure capable of suppressing body deformation at the time of a vehicle rear surface collision.

  The rear structure of the vehicle according to the first aspect of the present invention includes a pair of left and right rear side members that are disposed in the vicinity of both ends in the vehicle width direction of the rear floor pan of the vehicle, and extend substantially in the longitudinal direction of the vehicle. A rear cross member that connects substantially the middle part of the rear side member in the vehicle front-rear direction in the vehicle width direction, and a vehicle rear side and a vehicle width direction inner side of the pair of left and right rear side members. A second rear side member extending in the longitudinal direction and having a front end portion disposed opposite the rear wall portion of the rear cross member, and both end portions in the vehicle front-rear direction provided substantially in the vehicle front-rear direction. A pair of left and right suspension side parts attached to the rear side member, and a vehicle rear side of the suspension side part. A rear suspension member that includes a suspension rear cross portion that extends in the vehicle width direction and that connects the pair of left and right suspension side portions in the vehicle width direction, along the vehicle longitudinal direction. A rear differential gear box that is provided on the vehicle rear end side of the extended propeller shaft and is attached to the suspension rear cross portion of the rear suspension member, and the rear wall portion of the rear cross member. A collision load directed from the vehicle rear side to the vehicle front side, which is input to the second rear side member, is transmitted to the vehicle front side and is provided at a position corresponding to the front end of the second rear side member. A reinforcing member to be operated, and the reinforcement in the suspension side portion of the rear suspension member Together provided at a position corresponding to the timber, and a, a load transmission member for transmitting to the rear differential gear box through the rear suspension member to the collision load inputted from the reinforcing member.

  According to the first aspect of the present invention, the second rear side member is provided on the inner side in the vehicle width direction of the rear side member, and the front end portion of the second rear side member is disposed to face the rear wall portion of the rear cross member. ing. A reinforcing member is provided at a position corresponding to the front side of the rear wall portion of the rear cross member on the vehicle front side and the second rear side member. By this reinforcing member, the collision load that is input to the second rear side member from the vehicle rear side toward the vehicle front side is transmitted to the vehicle front side. A load transmission member is provided on the suspension side portion of the rear suspension member. The load transmitting member is provided at a position corresponding to the reinforcing member. Therefore, at the time of a vehicle rear collision, the collision load is input not only to the rear side member but also to the second rear side member, and the collision load is transmitted from the front end portion of the second rear side member to the load transmission member via the reinforcing member. . The collision load is transmitted to the rear differential gear box attached to the suspension rear cross portion of the rear suspension member. The collision load transmitted to the rear differential gearbox is transmitted to the vehicle front side along the propeller shaft. That is, by transmitting the collision load at the time of a vehicle rear collision not only to the rear side member but also to the rear suspension member, the collision load can be dispersed and the concentration of the collision load on the rear side member can be suppressed.

  The vehicle rear structure according to the first aspect of the present invention has an excellent effect that body deformation at the time of a vehicle rear surface collision can be suppressed.

It is a top view which shows a part of vehicle rear part structure which concerns on one Embodiment. It is a section perspective view showing the state which looked at the important section of the vehicle rear part structure concerning one embodiment from the vehicle width direction inner side toward the vehicle width direction outer side. It is a partial cross section side view which shows the state which looked at the principal part of the vehicle rear part structure which concerns on one Embodiment from the vehicle width direction inner side toward the vehicle width direction outer side. It is a schematic perspective view which shows the attachment state of the rear differential gearbox in the vehicle rear part structure which concerns on one Embodiment. (A) is sectional drawing which cut | disconnected the principal part of the normal state of the vehicle rear part structure which concerns on one Embodiment at right angles to the vehicle width direction, (B) is the state at the time of vehicle rear surface collision with respect to (A). FIG. It is a schematic perspective view which shows the modification of the load transmission member in the vehicle rear part structure which concerns on one Embodiment. It is a schematic perspective view which shows the modification of the load transmission member in the vehicle rear part structure which concerns on one Embodiment. It is a schematic perspective view which shows the modification of the load transmission member in the vehicle rear part structure which concerns on one Embodiment.

  Hereinafter, an embodiment of a vehicle rear structure according to the present invention will be described with reference to FIGS. In these figures, the arrow FR indicates the front side in the vehicle longitudinal direction, the arrow OUT indicates the vehicle width direction outside, and the arrow UP indicates the vehicle vertical direction upper side.

  As shown in FIG. 1, the vehicle body rear structure 11 according to this embodiment includes a rear floor pan 10, a rear side member 12, a rear cross member 14, a second rear side member 16, a rear suspension member 18, and a rear differential gear. A box 20, a reinforcing member 22, and a load transmission member 24 are provided. In addition, since this vehicle body rear part structure 11 is comprised left-right symmetrically, in the following description, only the structure of either right or left is demonstrated and description of either right or left may be abbreviate | omitted. Moreover, in each figure, the same sign is attached | subjected to the member made into the left-right pair. Moreover, in each figure, in order to show the principal part in an easy-to-understand manner, some parts and symbols may be omitted. Hereafter, each said component is demonstrated.

(Rear floor pan 10)
The rear floor pan 10 is also referred to as a rear floor panel, and is formed in a substantially flat plate shape in which the vehicle vertical direction is the plate thickness direction. The rear floor pan 10 is located on the rear floor pan front portion 27 (see FIG. 5A) located between the left and right rear tires 26 when viewed from the vehicle vertical direction, and on the vehicle rear side with respect to the rear floor pan front portion 27. A rear floor pan rear portion 28 and a rear floor pan intermediate portion 30 (see FIG. 5A) located between the rear floor pan front portion 27 and the rear floor pan rear portion 28 are provided. The rear floor pan rear portion 28 forms a floor surface of a luggage space (not shown).

  The rear floor pan front part 27 and the rear floor pan rear part 28 extend in the vehicle body longitudinal direction and the vehicle body width direction. As shown in FIG. 5A, the rear floor pan rear portion 28 is positioned on the vehicle body lower side than the rear floor pan front portion 27, and is formed wider than the rear floor pan front portion 27 in the vehicle body width direction. .

  The rear floor pan intermediate portion 30 has a substantially L-shaped cross section viewed from the side of the vehicle, and the rear floor pan front portion 27 and the rear floor pan rear portion 28 are connected via the rear floor pan intermediate portion 30. .

(Rear side member 12)
As shown in FIG. 1, the left and right rear side members 12 are disposed in the vicinity of the respective end portions 32 of the rear floor pan 10 in the vehicle width direction. The rear side member 12 is a skeleton member that is arranged with the longitudinal direction of the vehicle body approximately in the longitudinal direction. These rear side members 12 include a rear side member front portion 34 positioned between left and right rear tires 26 (not shown) when viewed from the vertical direction of the vehicle body, and a rear side member rear portion extending rearward from the rear end portion of the rear side member front portion 34. 36. The front end portion of the rear side member front portion 34 is coupled (welded: the same applies hereinafter) to a rear end portion of a rocker (not shown).

  The rear side member rear portion 36 is disposed on the vehicle body upper side with respect to the rear floor pan 10. The rear side member rear portion 36 is formed in a hat shape (not shown) having a cross-sectional shape orthogonal to the longitudinal direction opened to the vehicle body lower side, and left and right flanges provided on the opening side are spotted on the upper surface of the rear floor pan 10. Combined by welding.

  Further, the rear end 38 of the rear side member rear portion 36 is disposed on the rear side of the rear floor pan 10 and the left and right rear side members 12 via a lower bag 40 that extends in the vehicle body width direction and the vehicle body vertical direction. The rear bumper reinforcement 42 is fastened (see FIG. 5A). The rear bumper force 42 is formed in an elongated shape having the vehicle width direction as a longitudinal direction so as to connect the rear end portions 38 of the pair of left and right rear side members 12 in the vehicle width direction.

  Although not shown, the rear side member front portion 34 is formed in a cross-sectional hat shape in which a cross-sectional shape perpendicular to the longitudinal direction is opened to the outside in the vehicle body width direction, and the rear side member front portion 34 is illustrated on the outside in the vehicle body width direction. Not rear wheel house is combined.

(Second rear side member 16)
The second rear side member 16 is disposed on the inner side in the vehicle width direction of the pair of left and right rear side member rear portions 36. That is, the second rear side member 16 is provided in a pair of left and right. The second rear side member 16 is formed in an elongated shape with the longitudinal direction of the vehicle body as the longitudinal direction, and is disposed in proximity to the left and right rear side member rear portions 36 and substantially parallel to the left and right rear side member rear portions 36. ing.

  Although not shown, the second rear side member 16 has a hat shape with a cross-sectional shape orthogonal to the longitudinal direction opened to the vehicle body lower side, and left and right flanges provided on the opening side are spotted on the upper surface of the rear floor pan 10. They are connected by welding (in the drawing, the rear side member rear portion 36 and the second rear side member 16 are shown connected in the vehicle width direction for simplification).

  Further, the front end portion 46 of the second rear side member 16 is disposed away from the rear cross member 14 described later on the vehicle rear side. Specifically, the front end portion 46 of the second rear side member 16 is disposed so as to face the rear wall portion 48 of the rear cross member 14, and the front end portion 46 of the second rear side member 16, A gap (space) is formed between them (see FIG. 5A).

(Rear cross member 14)
A rear cross member 14 is coupled to an intermediate portion in the vehicle longitudinal direction of the pair of left and right rear side members 12. The rear cross member 14 is a skeletal member in which the vehicle longitudinal direction intermediate portions of the pair of left and right rear side members 12 are connected in the vehicle body width direction, and is formed in a long shape having the vehicle width direction as a longitudinal direction.

  As shown in FIG. 5A, the rear cross member 14 includes an upper wall portion 50 extending in the vehicle front-rear direction and a rear wall portion 48 extending from the rear end of the upper wall portion 50 to the vehicle body lower side. The cross-sectional shape orthogonal to the vehicle width direction is formed in a substantially inverted L shape. The front end portion 52 of the upper wall portion 50 is overlapped with the upper end portion 31 of the rear floor pan intermediate portion 30 and the rear end portion of the rear floor pan front portion 27 and joined by spot welding. The lower end portion 49 of the rear wall portion 48 is overlapped with the lower end portion 54 of the rear floor pan intermediate portion 30 and the front end portion 56 of the rear floor pan rear portion 28 and joined by spot welding. As a result, the rear cross member 14 has a closed cross section perpendicular to the vehicle width direction at the rear floor pan intermediate portion 30.

(Reinforcing member 22)
A pair of left and right reinforcing members 22 are provided on the vehicle front side of the rear wall portion 48 of the rear cross member 14. The reinforcing member 22 is formed of a metal plate as an example, and is formed in a box shape having substantially the same cross-sectional shape formed by the rear cross member 14 and the rear floor pan intermediate portion 30 in a side view of the vehicle. The rear cross member 14 is fixed by means such as welding or bolt fastening. The pair of left and right reinforcing members 22 are interposed between the front end portions 46 of the pair of left and right second rear side members 16 and the pair of left and right load transmitting members 24 of the rear suspension member 18 described later.

(Rear suspension member 18)
As shown in FIG. 1, the rear suspension member 18 is disposed between a pair of left and right rear tires 26. The rear suspension member 18 is attached with a suspension for suspending a pair of left and right rear tires 26, a suspension arm, a stabilizer (both not shown), and the like. The rear suspension member 18 includes a pair of left and right suspension side portions 58 arranged with the longitudinal direction of the vehicle body as a longitudinal direction, and a suspension rear cross portion 60 that connects the vehicle rear side of the pair of left and right suspension side portions 58 in the vehicle width direction. Have. Further, the rear suspension member 18 has a suspension front cross portion 62 (see FIG. 4) that connects the front side of the pair of left and right suspension side portions 58 in the vehicle width direction. It is formed in a frame shape.

  As shown in FIG. 3, the pair of left and right suspension side portions 58 are disposed on the vehicle body lower side of the pair of left and right rear side members with the vehicle longitudinal direction as the longitudinal direction. Are attached to the pair of left and right rear side members 12 via fastening cushions 68 by fastening members. The middle part in the front-rear direction of the pair of left and right suspension side portions 58 is curved in a convex manner toward the vehicle width direction center side and the vehicle body upper side (see also FIG. 2. The men front cross section 62 and the suspension rear cross section 60 are omitted). Further, the pair of left and right suspension side portions 58 are formed by hollow pipes.

(Load transmission member 24)
A load transmitting member 24 is provided on each of the pair of left and right suspension side portions 58 of the rear suspension member 18. The load transmitting member 24 is disposed at a position corresponding to the reinforcing member 22 of the rear cross member 14 on the vehicle rear side of the suspension side portion 58 and protrudes upward of the vehicle. Specifically, the load transmission member 24 is made of metal, and is formed in a rectangular shape when viewed from the front-rear direction of the vehicle body, and is formed in a substantially triangular shape when viewed from the vehicle body width direction (see FIG. 2). ).

  As shown in FIG. 1, the load transmitting member 24 is connected to the pair of left and right side wall portions 70 and 72 and the rear end portions of the left and right side wall portions 70 and 72 in the vehicle body width direction and extends in the vehicle body vertical direction. It has a wall portion 74 and a front wall portion 76 (see FIGS. 2, 3, 5A, etc.) extending from the upper end of the rear wall portion 74 obliquely downward to the front of the vehicle body.

  The left and right side wall portions 70 and 72, the rear wall portion 74, and the front wall portion 76 are formed by integrally bending a single metal plate. The rear wall portion 74, the front wall portion 76, and the left and right side wall portions 70, 72 are joined at their lower ends to the upper surface of the suspension side portion 58 by welding. As shown in FIG. 2, the pair of left and right load transmitting members 24 having the above-described configuration are disposed at positions that overlap the reinforcing member 22 of the rear cross member 14 when the vehicle is viewed from the front. In the present embodiment, the load transmission member 24 is coupled to the suspension side portion 58 by welding. However, the present invention is not limited to this, and the load transmission member 24 may be attached to the suspension side portion 58 by other methods. As an example, as shown in FIG. 6, a fastening wall portion 90 extending along the upper surface of the suspension side portion 58 at the lower end portion 85 of the rear wall portion 82 and the lower end portion 88 of the front wall portion 86 of the load transmitting member 80. And a fastener 92 is inserted into a fastening hole (not shown) formed in the fastening wall portion 90 and a corresponding through hole (not shown) formed in the upper surface of the suspension side portion 58 and fastened. Good.

(Rear differential gearbox 20)
As shown in FIG. 1, a rear differential gear box 20 is provided between a pair of left and right suspension side portions 58 of the rear suspension member 18. The rear differential gear box 20 is attached to the suspension front cross portion 62 and the suspension rear cross portion 60 of the rear suspension member 18 via mount cushions 68 (see FIG. 4).

  A propeller shaft 84 that transmits rotational power from a power source (not shown) is fastened to the front side of the rear differential gear box 20 in the vehicle. The rear differential gearbox 20 is configured to transmit the rotation of the propeller shaft 84 to the pair of left and right rear tires 26 via a drive shaft (not shown) extending along the vehicle width direction. Yes.

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

  In the present embodiment, as shown in FIG. 1, the second rear side member 16 is provided on the inner side in the vehicle width direction of the rear side member 12, and the front end portion 46 of the second rear side member 16 is connected to the rear cross member 14. It is arranged to face the rear wall portion 48. As shown in FIG. 2, a reinforcing member 22 is provided at a position corresponding to the second rear side member 16 in the closed cross section formed by the rear cross member 14 and the rear floor pan intermediate portion 30. Since the reinforcing member 22 is formed in a box shape having substantially the same shape as the cross-sectional shape formed by the rear cross member 14 and the rear floor pan intermediate portion 30 in a side view of the vehicle, the rear cross member at the time of a vehicle rear surface collision. 14 deformation is suppressed. Therefore, it is possible to transmit the collision load that is input to the second rear side member 16 from the vehicle rear side toward the vehicle front side to the vehicle front side without being absorbed by the deformation of the rear cross member 14.

  A load transmission member 24 is provided on the suspension side portion 58 of the rear suspension member 18. The load transmitting member 24 is provided at a position corresponding to the reinforcing member 22. Therefore, as shown in FIG. 5 (B), in the event of a vehicle rear surface collision, a collision load is input not only to the rear side member 12 but also to the second rear side member 16 and from the front end portion 46 of the second rear side member 16 to the rear side. The collision load is transmitted to the load transmitting member 24 through the reinforcing member 22 in the cross member 14. The collision load is transmitted to the rear differential gear box 20 attached to the suspension rear cross portion 60 of the rear suspension member 18 as shown in FIG. The collision load transmitted to the rear differential gear box 20 is transmitted to the vehicle front side along the propeller shaft 84 shown in FIG. That is, by transmitting the collision load at the time of a vehicle rear collision not only to the rear side member 12 but also to the rear suspension member 18 side, the collision load can be dispersed and the concentration of the collision load on the rear side member 12 can be suppressed. . Thereby, the body deformation | transformation at the time of a vehicle rear surface collision can be suppressed.

  Further, as shown in FIG. 3, the rear side member front part 34 is generally curved so as to protrude upward in the vehicle, so that a collision load is input to the rear side member 12 at the time of a vehicle rear surface collision. Then, the rear side member rear portion 36 acts so as to rotate upward of the vehicle around the curved portion. However, in the present embodiment, the collision load is also transmitted to the rear suspension member 18, the rear differential gear box 20, and the propeller shaft 84 provided on the vehicle lower side of the rear side member 12. Generates forces acting in different directions. That is, since the force for rotating the rear side member 12 is canceled by the force transmitted to the rear side member 12 and the like, the rotation of the rear side member 12 can be suppressed.

  In the present embodiment, the load transmission member 24 is formed in a rectangular shape when viewed from the front-rear direction of the vehicle body, and is formed in a substantially triangular shape when viewed from the vehicle body width direction. It is good also as a shape. As an example, a single metal plate may be bent in a crank shape when viewed from the side of the vehicle, as in the load transmission member 96 shown in FIG. 7, or a box like the load transmission member 98 shown in FIG. It is good also as a shape.

  Further, the load transmitting member 24 and the reinforcing member 22 are not limited to metals, and may be made of other materials such as fiber reinforced resin.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above, and various modifications other than those described above can be implemented without departing from the spirit of the present invention. Of course.

10 Rear floor pan 11 Rear body structure 12 Rear side member 14 Rear cross member 16 Second rear side member 18 Rear suspension member 20 Rear differential gear box 22 Reinforcement member 24 Load transmission member 32 Ends (both ends in the vehicle width direction of the rear floor pan)
46 front end portion 48 rear wall portion 58 suspension side portion 60 suspension rear cross portion 80 load transmission member 84 propeller shaft 96 load transmission member 98 load transmission member

Claims (1)

A pair of left and right rear side members disposed near both ends in the vehicle width direction of the rear floor pan of the vehicle, and extending substantially in the longitudinal direction of the vehicle longitudinal direction;
A rear cross member that connects substantially the middle part in the vehicle longitudinal direction of the pair of left and right rear side members in the vehicle width direction;
The pair of left and right rear side members are respectively provided on the vehicle rear side and the vehicle width direction inner side, extend substantially in the longitudinal direction of the vehicle and have a front end facing the rear wall of the rear cross member. A second rear side member disposed;
A pair of left and right suspension side portions that are provided with the vehicle front-rear direction as a longitudinal direction and both ends of the vehicle front-rear direction are attached to the rear side member, and are disposed on the vehicle rear side of the suspension side portion and extend in the vehicle width direction as a longitudinal direction. A rear suspension member formed and including a suspension rear cross portion connecting the pair of left and right suspension side portions in the vehicle width direction;
A rear differential gear box provided on the vehicle rear end side of a propeller shaft extending along the vehicle longitudinal direction and attached to the suspension rear cross portion of the rear suspension member;
The rear cross member is provided at a position corresponding to the front side of the rear wall portion of the rear cross member and the front end portion of the second rear side member, and from the rear side of the vehicle input to the second rear side member to the front side of the vehicle. A reinforcing member that transmits a collision load to the front side of the vehicle;
A load transmission that is provided at a position corresponding to the reinforcing member in the suspension side portion of the rear suspension member and that transmits the collision load input from the reinforcing member to the rear differential gear box via the rear suspension member. Members,
A vehicle rear structure having

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