JP2006168434A - Rear body structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear body structure of a vehicle with high rigidity. <P>SOLUTION: In this rear body structure of a vehicle with a trunk-through specification having an upper back member 6 at a rear part of the vehicle, the upper back member 6 is arranged to traverse the vehicle at a position displaced from an upper position of respective right and left suspension parts 7 toward a front of the vehicle, and a center floor cross member 4 is arranged at a front downward position of the upper back member. On right and left sides of a vehicle rear part, a first reinforcing member 10 couples an end of the upper back member with a rear suspension part adjacent to the end, and a second reinforcing member 20 couples an end of the upper back member with an end of the center floor cross member at the lower front part of the end. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle body structure at the rear of an automobile, and more particularly to a vehicle rear body structure that secures the rigidity of the automobile rear without providing a partition panel that partitions a vehicle compartment space and a trunk room.

  Conventionally, in a vehicle such as a passenger car, a body style such as a so-called three box in which an engine room, a cabin space, and a trunk room are arranged in three boxes is known. Such body-style sedan and four-door hardtop type vehicles have a partition panel disposed at the rear of the body in order to partition the passenger compartment space and the trunk room (see Patent Document 1).

  For example, as shown in FIG. 7, this type of vehicle is provided with side members 52 that are adjacent to the left and right rear wheel houses 51 and whose longitudinal direction is directed to the front and rear of the vehicle, and between these left and right side members 52. A center floor cross member 53 is horizontally installed. The center floor cross member 53 has a U-shaped cross section and is joined to the floor panel 54 so as to define a closed cross section. In the figure, F means the front of the vehicle, R means the right side of the vehicle, and H means the vehicle height direction.

  The conventional vehicle is provided with an upper back member 57 at a position above the center floor cross member 53 and in the vicinity of the base end of the C pillar 55, that is, in the vehicle width direction. A partition panel 60 formed in a flat plate shape is installed so as to span between the member 57 and the center floor cross member 53.

  In the conventional vehicle, the rear suspension tower is attached to the wheel house 51, and the upper back member 57 and the center floor cross member 53 are coupled via the partition panel 60 as a countermeasure against the input from the rear suspension tower. Therefore, the rigidity of the body is secured.

  In such a conventional vehicle rear body structure, a rear seat is fixedly attached to the rear position of the passenger compartment space, that is, the front surface of the partition panel 60 that forms a boundary with the trunk room, or a reclining rear seat is installed. In order to apply the so-called trunk-through specification, which is suitable for the case, to the rear body structure of such a vehicle, which enables the entry / extraction of objects from the rear seat into the trunk room, the partition panel 60 is designed to separate the vehicle compartment space and the trunk room from each other. In order to avoid this, the partition panel 60 is removed and the rear portion of the vehicle is configured to reduce the rigidity of the body.

  Therefore, in order to give rigidity to the rear part of the vehicle adopting the trunk through specification, in the rear body structure 70 of another conventional example shown in FIGS. 8 to 10, the reinforcing member 71 is provided between the rear suspension part 72 and the upper part thereof. An upper back member 73 extending in the vehicle width direction is coupled.

Instead of such a rear body structure 70, another conventional rear body structure 80 shown in FIGS. 11 to 13 is also conceivable.
In the rear body structure 80, a panel-like reinforcing member 81 is disposed so as to partially bridge the upper back member 82 and the center floor cross member 53 at a position close to the wheel house. The upper end portion of the reinforcing member 81 is joined to the upper back member 82, and the lower end portion is joined to the center floor cross member 53.

JP 2000-229584 A

However, the reinforcing member 71 of the rear body structure 70 shown in FIG. 8 is configured to have a low height H as shown in FIG.
Further, the reinforcing member 81 of the rear body structure 80 shown in FIG. 11 is formed as a thin plate, and such a flat plate simply connects the upper and lower end portions to the upper back member 82 and the center floor cross member 53. Since it was only disposed, the torsional rigidity was low.

  An object of the present invention is to provide a vehicle rear body structure having high rigidity in view of the above points.

  In order to achieve the above object, the present invention provides a rear body structure for a trunk-through type vehicle having an upper back member at the rear of the vehicle, wherein the upper back member is positioned forward of the vehicle from above the left and right rear suspension portions. The center floor cross member is disposed at the front lower position of the upper back member, and the first reinforcing member is disposed at the end of the upper back member at the right and left sides of the rear portion of the vehicle. And the rear suspension part adjacent to this end part, and the second reinforcing member joins the end part of the upper back member and the end part of the center floor cross member located below the front part of the upper back member. It is characterized by.

  Furthermore, in the vehicle rear body structure according to the present invention, the first reinforcing member is integrally provided with a bone portion having a U-shaped cross section, and a flat surface is formed at the upper end of the bone portion. The upper back member is supported by the bone portion while being joined to the bottom surface of the member. Furthermore, in the rear body structure of the vehicle of the present invention, the second reinforcing member is formed in a U-shaped cross section.

  According to such a configuration, the joint portion between the upper back member and the vehicle body, that is, both end portions of the upper back member are supported by the first reinforcing member and the second reinforcing member, respectively. High rigidity against lateral bending, tilting and twisting.

The present invention will be described in detail below based on the embodiments shown in the drawings. In the figure, F means the front of the vehicle, R means the right side of the vehicle, and H means the vehicle height direction.
1 is a perspective view showing a rear body structure 1 according to an embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a side view, and FIG. 4 is a schematic plan view. As shown in the figure, the rear body structure 1 is provided with side members 3 that are adjacent to the left and right wheel houses 2 and whose longitudinal direction faces the front and rear of the vehicle, and between these left and right side members 3 and 3. The center floor cross member 4 is installed horizontally. The center floor cross member 4 has a U-shaped cross section and is joined to the floor panel 5 so as to define a closed cross section.

Further, the rear body structure 1 includes an upper back member 6 so as to cross the vehicle at a rear upper position of the center floor cross member 4, that is, in the vehicle width direction.
Furthermore, one part of the wheel house 2 protrudes toward the passenger compartment space corresponding to the shape of the upper end of the suspension tower that supports the rear suspension. Instead of partially projecting the wheel house itself as described above, a rear suspension tower is attached to the wheel house 3 so that the upper end of the suspension tower projects from the opening formed in the wheel house 3 toward the vehicle interior space. May be. Hereinafter, a part of the wheel house thus formed and the suspension tower protruding from the opening of the wheel house 3 toward the vehicle compartment space will be referred to as a rear suspension portion 7.

  Here, in the rear body structure 1 according to the embodiment of the present invention, the arrangement relationship among the rear suspension portion 7, the upper back member 6, and the center floor cross member 4 is set as shown in the figure, for example. That is, the upper back member 6 is disposed in the vehicle width direction so as to cross the vehicle at a position shifted from the upper position of the rear suspension portion 7 toward the front of the vehicle. Further, the center floor cross member 4 is disposed at a front lower position of the upper back member 6 and is joined to the floor panel 5.

  Furthermore, in the rear body structure 1 according to the embodiment of the present invention, as shown in the drawing, the upper back member 6 and the rear suspension portion 7 are coupled by a first reinforcing member 10. The first reinforcing member 10 is a so-called gusset, and includes a base portion 11 that is fixed to the upper surface of the rear suspension portion 7 and a bone member 12 that rises from the base portion 11 as shown in FIG. The bone member 12 includes a pair of bone portions 12A and 12B. Further, in the bone member 12, a recess 12C is formed between the bone portion 12A and the bone portion 12B, and the bone portions 12A and 12B are formed. It is installed side by side. Further, as shown in FIG. 4, each of the bone parts 12A and 12B has a U-shaped cross section. Further, as shown in FIG. 3, each of the bone parts 12 </ b> A and 12 </ b> B is slightly tilted forward from the vehicle and stands from the base part 11. Furthermore, the upper end of one bone 12A is configured as a plane 12D, and this plane 12D is joined to the bottom of the end of the upper back member 6 on the right side of the vehicle as shown in FIGS. As a result, the rear bottom surface of the upper back member 6 is supported by the first reinforcing member 10.

  Further, a flange 12E extends around the periphery of the bone member 12, and the flange 12E is fixed to a member constituting the rear side surface of the vehicle, such as an inner panel or a wheel house, by spot welding or the like.

Further, in the rear body structure 1 according to the embodiment of the present invention, the end of the upper back member 6 and the end of the center floor cross member 4 are connected by the second reinforcing member 20 on the right side of the rear portion of the vehicle.
The second reinforcing member 20 is a so-called strainer, and as shown in FIGS. 1, 3, and 6, a flat plate-shaped first inclined portion 21 and a curved curve extending from the end of the first inclined portion 21. It is comprised from the part 22 and the 2nd inclination part 23 extended from the edge of the bending part 22, and arrange | positioned substantially parallel to the 1st inclination part 21. As shown in FIG. In addition, the 2nd reinforcement member 20 is comprised as the frame | skeleton which the 1st inclination part 21, the curved part 22, and the 2nd inclination part 23 unite, and makes a cross-section cross-section.

  As shown in FIG. 2, the first inclined portion 21 is formed such that the right edge portion thereof is along the side surface of the rear portion of the vehicle, and a flange 21 </ b> A extends from this edge portion. It is fixed to a member constituting the rear side surface of the vehicle, such as an inner panel, the wheel house 2 or the like, by spot welding or the like.

The lower portion of the first inclined portion 21 is joined to the front surface of the center floor cross member 4, and the upper portion of the first inclined portion 21 is joined to the front surface of the upper back member 6.
Further, as shown in FIG. 2, the first inclined portion 21 is formed in an arc shape so that the left side edge is recessed in the middle of the height.
The curved portion 22 has a lower end dimension set to about the width of the center floor cross member 4, an upper end dimension set to about the width of the upper back member 6, and the width from the lower end toward the upper end direction. The lower part is joined to the upper surface of the center floor cross member 4, and the upper part is joined to the bottom surface of the upper back member 6.
The second inclined portion 23 is configured in substantially the same manner as the first inclined portion 21, but the second inclined portion 23 is different from the first inclined portion 21 in joining to the bottom surface of the upper back member 6, as shown in FIG. 4. 23 is joined to the bottom surface of the upper back member 6 so that it does not overlap the connecting portion between the flange 12D of the first reinforcing member 10 and the bottom surface of the upper back member 6. For example, as shown in FIG. 4, the flange 12 </ b> D of the first reinforcing member 10 and the bottom surface of the upper back member 6 are formed by making the size of the upper end of the second inclined portion 23 shorter than the width of the upper end of the first inclined portion 21. It can be made not to overlap with the connection part.

  In the above description, the structural example of the right side of the rear part of the vehicle has been described. Similarly, the left end part of the upper back member 6 is supported by the first reinforcing member fixed on the left rear suspension part. In addition, the left end portion of the upper back member 6 and the left end portion of the center floor cross member 4 are connected by the second reinforcing member.

  As described above, in the rear body structure 1 according to the embodiment of the present invention, the upper back member 6 that defines the closed cross section is used as the apex, and is bridged from the center floor cross member 4 to the upper back member 6 disposed on the rear side. The second reinforcing member 20 is disposed on the rear suspension portion 7 and the first reinforcing member 10 is disposed over the upper back member 6 disposed on the front upper side. Thus, in the rear body structure 1, the upper back member 6, the first reinforcing member 10, and the second reinforcing member 20 are arranged so as to form a mountain shape.

  In the rear body structure 1 according to the embodiment of the present invention configured as described above, since the upper back member 6 is supported by the first reinforcing member 10 and the second reinforcing member 20 from the front and rear thereof, the vehicle rear portion has high rigidity. You can have it. In such a structure, as the rear body rigidity, the torsional rigidity was improved by about 7% and the lateral bending rigidity was improved by about 13%.

1 is a perspective view showing a rear body structure of a vehicle according to an embodiment of the present invention, and particularly shows a right rear portion of the vehicle. It is a front view of the rear body structure of the vehicle of FIG. It is a side view of the rear body structure of the vehicle of FIG. It is a top view of the rear body structure of the vehicle of FIG. It is a perspective view which shows the 1st reinforcement member which concerns on embodiment of this invention. It is a perspective view which shows the 2nd reinforcement member which concerns on embodiment of this invention. It is a perspective view which shows an example of the rear body structure of the conventional vehicle. It is a perspective view which shows the other example of the conventional rear body structure. It is a front view of the rear body structure of FIG. It is a side view of the rear body structure of FIG. It is a perspective view which shows another example of the conventional rear body structure. It is a front view of the rear body structure of FIG. FIG. 12 is a side view of the rear body structure of FIG. 11. It is a top view of the rear body structure of FIG. FIG. 12 is a plan view of the rear body structure of FIG. 11.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear body structure 2 Wheel house 3 Side member 4 Center floor cross member 5 Floor panel 6 Upper back member 7 Rear suspension part 10 First reinforcement member 11 Base part 12 Bone member 12A, 12B Bone part 12C Bone part depression 12D Plane 12E Flange 20 2nd reinforcement member 21 1st inclination part 21A flange 22 bending part 23 2nd inclination part

Claims (3)

A trunk-through vehicle rear body structure having an upper back member at the rear of the vehicle,
The upper back member is disposed so as to cross the vehicle at a position shifted from the upper position of each of the left and right rear suspension portions to the front of the vehicle, and the center floor cross member is disposed at a lower front position of the upper back member. ,
On the right side and the left side of the rear part of the vehicle, the first reinforcing member connects the end portion of the upper back member and the rear suspension portion close to the end portion, and the second reinforcing member is connected to the end portion of the upper back member and the end portion. A rear body structure for a vehicle, wherein an end portion of the center floor cross member located below the front portion of the vehicle is coupled. The first reinforcing member is integrally provided with a bone part formed in a U-shaped cross section, and a flat surface is formed at the upper end of the bone part,
The vehicle rear body structure according to claim 1, wherein the flat surface is joined to a bottom surface of the upper back member, and the upper back member is supported by the bone portion. The vehicle rear body structure according to claim 1, wherein the second reinforcing member is formed in a U-shaped cross section.

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