JP4822056B2 - Car body rear structure - Google Patents

Description

  The present invention relates to a vehicle body rear structure.

  One of the vehicle body types is a hatchback vehicle having a rear gate opening at the rear end of a rear section. A hatchback vehicle having such a rear gate opening is generally inferior in vehicle body rigidity as compared with, for example, a sedan type vehicle in which a rear gate opening is not formed. Therefore, in a hatchback vehicle, in order to improve vehicle body rigidity, a rear end cross member that connects between rear end portions of a pair of rear side frames extending in the vehicle front-rear direction under the vehicle floor panel is provided on the rear surface of the rear end panel. Is known from, for example, US Pat.

JP 2002-331962 A

  By the way, the wagon car, the minivan, etc., which are the hatchback cars described above, have the lower end of the rear gate extending to a relatively low position, and by opening the rear gate and exposing the rear gate opening, the rear gate opening to the rear luggage compartment It has the convenience that a load can be easily loaded. Therefore, in view of the load in the rear luggage compartment, especially heavy loads, the more the rear gate opening is expanded downward, that is, the lower the lower edge of the rear gate opening is, the more the luggage must be lifted. The height can be lowered, and the convenience for the user is further improved.

  However, when the lower end of the rear skeleton member of the vehicle body constituting the lower edge of the rear gate opening has the same height, the lower the lower edge of the rear gate opening (the upper end of the rear skeleton member), the lower the rear skeleton member. There is a problem that the overall height of the vehicle body is shortened, and the rigidity of the rear skeleton member, and thus the rigidity of the entire vehicle body constituting the rear gate opening (particularly, the torsional rigidity) is lowered. Further, when the rear gate opening is expanded downward and the rear frame member is lowered to the height of the rear end portion of the rear side frame, the rear end cross member described above is provided at the rear end portion of the rear side frame on the rear surface of the rear end panel. There is a problem that the vehicle body rigidity cannot be improved.

  The present invention has been invented in order to solve the above-described technical problem, and the rear portion of the vehicle body can improve the rigidity of the rear portion of the vehicle body even when the rear end cross member cannot be provided on the rear surface of the rear end panel. The purpose is to provide a structure.

To achieve the above object, a vehicle body rear structure according to the present invention includes a left and right rear side frame extending in the front-rear direction of a vehicle, a first rear cross member connecting between the rear end portions of the left and right rear side frames, A rear end panel that is disposed behind the first rear cross member in the vehicle front-rear direction and that forms a closed cross section that extends in the vehicle width direction together with the first rear cross member, and a rear surface of the first rear cross member in the vehicle front-rear direction. is, wherein the left via the first rear cross member, have a second rear cross member connecting the rear end portion of the right rear side frame, and the wherein the first rear cross member second rear cross member A closed cross section extending in the vehicle width direction is configured .

Even in a vehicle in which the rear end cross member cannot be provided on the rear surface of the rear end panel by expanding the rear gate opening downward, the left rear by the second rear cross member disposed between the first rear cross member and the rear end panel behind the first rear cross member, By connecting the right rear side frame, it is possible to improve the rigidity of the rear portion of the vehicle body, and thus improve the handling performance of the vehicle. Furthermore, since the closed cross section is further constituted by the first rear cross member and the second rear cross member in the closed cross section constituted by the first rear cross member and the rear end panel, the vehicle body rigidity (torsional rigidity) is further improved. Can be made.

  In addition, it is preferable that a closed cross section constituted by the first rear cross member and the rear end panel is larger than a closed cross section constituted by the first rear cross member and the second rear cross member. In this configuration, the torsional rigidity of the vehicle body can be improved by the first rear cross member and the rear end panel, and the torsional rigidity of the left and right rear side frames can be improved by the first rear cross member and the second rear cross member. Can be improved locally.

  Further, the first rear cross member includes a locking member for locking the rear gate attached to the rear gate opening of the vehicle so as to be opened and closed. The locking of the first rear cross member to which the locking member is attached It is preferable to have connection reinforcing means for connecting the member mounting portion and the second rear cross member. In this configuration, it is possible to distribute the load of the portion where the load of the rear gate such as the latch and the hinge is large not only on the first rear cross member but also on the second rear cross member.

  Furthermore, a flange for supporting a part of the first rear cross member is provided at a rear end portion of the rear side frame, and each of the flange, the first rear cross member, and the second rear cross member, A through hole is formed, and the rear side frame and the second rear cross member are fastened and fixed via fastening members that pass through the through holes of the flange, the first rear cross member, and the second rear cross member. Is preferred. In this configuration, the rear side frame and the second rear cross member can be firmly fixed together.

  ADVANTAGE OF THE INVENTION According to this invention, even when a rear end cross member cannot be provided in a rear end panel rear surface, the vehicle body rear part structure which can improve the rigidity of a vehicle body rear part can be provided.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  Referring to FIG. 1, a part of a vehicle body 1 in which a rear gate opening 2 is formed in a rear section is shown. A rear gate (not shown) is hinged to the roof rear end 1A of the vehicle body 1 constituting the rear gate opening 2, and extends to the lower surface of the floor panel 3 constituting the bottom of the vehicle body 1 in the vehicle front-rear direction. Left and right rear side frames 3A and 3B are attached.

  Each of the rear side frames 3A and 3B is formed of an annular member having a closed cross section extending in the vehicle front-rear direction, and substantially terminates at the rear end of the vehicle body 1, and is attached to a rear end portion of each rear side frame 3A and 3B. 4 is provided. The mounting flange 4 may be formed integrally with each of the rear side frames 3A and 3B, or formed separately from each of the rear side frames 3A and 3B. The rear side frames 3A and 3B may be formed in a known appropriate manner such as welding or riveting. It may be attached to 3B. Each mounting flange 4 extends inward, outward, and downward in the vehicle width direction from the rear end of each rear side frame 3A, 3B, and a through hole 5A that penetrates the mounting flange 4 in the vehicle front-rear direction on both lower sides. 5B are formed.

  At the rear end of the vehicle body 1, as shown in FIG. 1, a first rear cross member, that is, an inner cross member 10, a second rear cross member, that is, an outer cross member 20, and a rear end panel 30, are sequentially arranged. It is attached.

  The inner cross member 10 extends substantially frontward in the vehicle front-rear direction from the body rear end abutting portion 10A extending substantially across the vehicle width of the rear end portion of the vehicle body 1, and from both sides of the body rear end abutting portion 10A. It has body side part contact part 10B, 10C. As best seen in FIG. 5, the body rear end contact portion 10 </ b> A includes a vertical plate portion 11, a horizontal plate portion 12 extending rearward in the vehicle front-rear direction from the upper edge of the vertical plate portion 11, and the rear of the horizontal plate portion 12. Each of the body side abutting portions 10B and 10C is a vertical plate portion. The lower inclined plate portion 13 extends downward and rearward from the edge, and the upper inclined joint plate portion 14 extends upward and rearward from the rear edge of the lower inclined plate portion 13. 11 only.

  As shown in FIG. 2, the inner cross member 10 has a body rear end contact portion 10 </ b> A on the rear end portion of the vehicle body 1, and body side portion contact portions 10 </ b> B and 10 </ b> C on the side surface of the rear end portion of the vehicle body 1. The inner cross member 10 is welded to the vehicle body 1 at an appropriate position so as to be in contact with each other.

  The inner cross member 10 also aligns with the through holes 5A and 5B formed in the mounting flanges 4 of the rear side frames 3A and 3B when the inner cross member 10 is attached to the rear end of the vehicle body 1. Through holes 15A and 15B are formed in a portion (of the vertical plate portion 11 of the body rear end contact portion 10A).

  Further, the vehicle width direction central portion of the vertical plate portion 11 of the body rear end abutting portion 10A protrudes rearward in the vehicle front-rear direction in a circular arc shape that is symmetric about the vehicle longitudinal axis in plan view, and is an arc-shaped central protrusion portion. 16 is configured. As shown in FIG. 6, the vertical plate portion 11 constituting the arcuate central projecting portion 16 includes a rear lower inclined plate portion 11a and a vertical plate portion 11b extending vertically downward from the lower edge of the rear lower inclined plate portion 11a. It consists of.

  Further, a striker mounting portion 12A slightly inclined upward and rearward is formed at the center of the horizontal plate portion 12 of the body rear end contact portion 10A in the vehicle width direction, as can be seen in FIG. A pair of mounting holes 17 spaced from each other in the vehicle width direction are formed in the portion 12A (FIG. 1).

  Next, the outer cross member 20 is attached to the rear part of the vehicle body 1 via the inner cross member 10, as shown in FIG.

  The outer cross member 20 is formed of a plate-like member having a length substantially equal to the vehicle width direction length of the body rear end abutting portion 10A of the inner cross member 10, and substantially the entire width thereof is shown in FIG. As can be clearly understood from FIG. 6, a shelf-like protruding portion 21 that protrudes rearward in the vehicle front-rear direction is provided. The shelf-like projecting portion 21 is formed at the center in the height direction of the outer cross member 20, and a semi-arc-like projecting portion 22A that further projects rearward in the vehicle front-rear direction is formed on the upper and lower portions of the shelf-like projecting portion 21, respectively. 22B is formed.

  The central portion of the outer cross member 20 facing the arcuate central protrusion 16 (a part of) of the inner cross member 10 also protrudes rearward in the vehicle front-rear direction in an arc shape when seen in a plan view. The unit 26 is configured.

  Further, when the outer cross member 20 is disposed at a predetermined mounting position on the rear surface of the inner cross member 10, the through holes 5A and 5B of the mounting flanges 4 of the rear side frames 3A and 3B and the inner cross member 10 are arranged. The through holes 25A and 25B are provided in the portions that are aligned with the through holes 15A and 15 respectively.

  Further, the upper end portion of the outer cross member 20 is formed so as to be in surface contact with the horizontal plate portion 12 (a part thereof) of the inner cross member 10 and the striker mounting portion 12A substantially between the through holes 25B and 25B. And has an extended flange 23 (FIGS. 1 and 6). A through hole (not shown) is formed in the extension flange 23 at a portion facing the mounting hole 17 of the inner cross member 10.

  The outer cross member 20 is attached to the rear portion of the vehicle body 1 by attaching the outer cross member 20 to the through holes 25A and 25B and the through holes 5A and 5B of the mounting flanges 4 of the rear side frames 3A and 3B. Positioned behind the inner cross member 10 to align with each through hole 15A, 15 of the member 10 and, as can be seen in FIG. 5, the bolt B is aligned with each of the aligned through holes 5A, 5B, 15A, 15 , 25A, 25B, and the nut N is screwed into the bolt B, and the mounting flange 4, the inner cross member 10 and the outer cross member 20 are fastened and fixed to each other. When the inner cross member 10 and the outer cross member 20 are fixed in this manner, as can be seen from FIGS. 5 and 6, the vehicle width that forms the internal space IS1 by the inner cross member 10 and the outer cross member 20 A closed cross section extending in the direction is formed.

  Thus, since the rear side frames 3A and 3B are connected by the outer cross member 20 via the inner cross member 10, the rigidity of the rear portion of the vehicle body can be improved. Moreover, in this embodiment, the outer cross member 20 forms the internal space IS1 between the inner cross member 10 and the inner cross member 10 so as to form a closed cross section that extends in the vehicle width direction together with the inner cross member 10. As compared with the case where the entire outer cross member 20 is in surface contact with the inner cross member 10, the rigidity (torsional rigidity) of the rear portion of the vehicle body can be further improved.

  Finally, as shown in FIG. 4, the rear end panel 30 is attached to the rear portion of the vehicle body 1 to which the inner cross member 10 and the outer cross member 20 are already attached.

  The rear end panel 30 includes a body rear end corresponding portion 30A that extends substantially across the vehicle width of the rear end portion of the vehicle body 1, and a body side portion that extends forward in the vehicle longitudinal direction from both side portions of the body rear end corresponding portion 30A. It has contact parts 30B and 30C.

  The body rear end corresponding portion 30A of the rear end panel 30 includes a first vertical plate portion 31 that contacts the lower portion of the vertical plate portion 11 of the inner cross member 10, and a first vertical plate portion, as can be seen well in FIGS. A first inclined plate portion 32 extending slightly upward from the upper edge of the vehicle 31 in the longitudinal direction of the vehicle, a second vertical plate portion 33 extending upward from the upper edge of the first inclined plate portion 32, and a second vertical plate portion 33 A second inclined plate portion 34 extending upward and backward from the upper edge of the vehicle in the vehicle longitudinal direction, a third vertical plate portion 35 extending upward from the upper edge of the second inclined plate portion 34, and an upper edge of the third vertical plate portion 35 A third inclined plate portion 36 slightly extending upward and forward in the vehicle longitudinal direction, and an inner cross member extending slightly upward and rearward in the vehicle longitudinal direction from the upper edge of the third inclined plate portion 36. 0 of the upper inclined junction plate 14 consists of contact with the upper inclined junction plate portion 37.. Each of the body side contact portions 30B and 30C has a lower portion formed in a shape substantially complementary to the body side portion contact portions 10B and 10C of the inner cross member 10, and an upper portion of the side face contact portion 30B and 30C. It is shaped in a nearly complementary shape.

  Vehicle width of the rear end corresponding portion 30A of the rear end panel 30 facing the arcuate central protrusion 16 (a part) of the inner cross member 10 and the arcuate central protrusion 26 (a part) of the outer cross member 20 The central portion in the direction also projects rearward in the vehicle front-rear direction in an arc shape when viewed from the bottom to form an arc-shaped central projecting portion 36.

  Further, when the rear end panel 30 is attached to the rear end portion of the vehicle body 1, the through holes 5A and 5B of the attachment flanges 4 of the rear side frames 3A and 3B, the through holes 15A and 15 of the inner cross member 10, Service holes 35A and 35B are formed in the portion of the rear end panel 30 that is aligned with the through holes 25A and 25B of the outer cross member 20. Bolts B and nuts N can be maintained from these service holes 35A and 35B.

  The rear end panel 30 is attached to the rear portion of the vehicle body 1 by attaching the rear end panel 30 to the service holes 35A and 35B of the through holes 5A and 5B of the mounting flanges 4 of the rear side frames 3A and 3B and the inner cross member 10. The rear cross member 20 is positioned behind the outer cross member 20 so as to be aligned with the through holes 15A, 15 and the through holes 25A, 25B of the outer cross member 20, and the body side contact portions 30B, 30C of the rear end panel 30 are positioned in the vehicle body 1. The upper inclined joining plate portion 37 of the rear end panel 30 is welded to the upper inclined joining plate portion 14 of the inner cross member 10 on the side surface of the rear end panel (FIGS. 5 and 6). A part of the rear end panel 30 may be appropriately welded to the inner cross member 10 and the outer cross member 20.

  Thus, the inner cross member 10 and the rear end panel 30 that are fixed to each other form a closed cross section that extends in the vehicle width direction and that forms the internal space IS2, as can be seen from FIGS. That is, the inner cross member 10 and the rear end panel 30 form an internal space IS2 (closed cross section) so as to surround the internal space IS1 (closed cross section) formed by the inner cross member 10 and the outer cross member 20 described above. Therefore, the rigidity (torsional rigidity) of the rear part of the vehicle body can be further improved.

  By the way, as shown in FIG. 6, the striker mounting portion 12A of the inner cross member 10 described above uses a mounting hole 17 formed in the striker mounting portion 12A so as to be rotatably mounted on the rear gate opening 2. A locking member for locking (not shown), that is, a striker 50 is attached. A latch (not shown) provided in the lower part of the rear gate (not shown) and in the center in the vehicle width direction is releasably locked to the striker 50.

  As shown in FIG. 6, the striker 50 includes a pair of legs 50a and 50b spaced apart in the vehicle front-rear direction and a connecting portion 50c that connects upper ends of the legs 50a and 50b. The lower ends of the legs 50a and 50b are fixed to the center of the mounting plate 51 in the vehicle width direction, and through holes (not shown) are formed at the ends of the mounting plate 51 in the vehicle width direction.

  In order to fix the mounting plate 51 provided with the striker 50 to the striker mounting portion 12A, a connection reinforcing plate 60 is disposed on the lower surface of the extension flange 23 of the outer cross member 20 as shown in FIG. When the connection reinforcing plate 60 is also disposed at a predetermined mounting position, the through hole (not shown) of the mounting plate 51, the mounting hole 17 of the inner cross member 10, and the extension facing these mounting holes 17. A through hole (not shown) is provided at a position aligned with a through hole (not shown) formed in the flange 23. Accordingly, the bolt B2 is aligned with the through holes (not shown) of the mounting plate 51, the mounting holes 17 of the inner cross member 10, the through holes (not shown) of the extension flange 23, and the through holes of the connection reinforcing plate 60. After passing through a hole (not shown), the nut N2 is screwed into the bolt B2, so that the mounting plate 51 having the striker 50 is attached to the striker mounting portion 12A of the inner cross member 10 and the extension flange of the inner cross member 10. 23. It can be fastened and fixed to the connection reinforcing plate 60. When the rear gate (not shown) is closed on the striker 50, a load on the rear gate is greatly applied. In this embodiment, the striker 50 includes not only the inner cross member 10 but also the outer cross member 20, the connection reinforcing plate. Therefore, the load applied to the striker 50 by the rear gate can be distributed not only to the inner cross member 10 but also to the outer cross member 20 and the connection reinforcing plate 60.

The present invention is not limited to the above-described embodiments, and various modifications as described below are possible.
In the above embodiment, the internal space IS1 constituted by the inner cross member 10 and the outer cross member 20 has a shape as shown in FIGS. 5 and 6, but if the desired vehicle body rigidity can be obtained, the internal space IS1 can be obtained. In other words, the inner cross member 10 and the outer cross member 20 can take any shape. Similarly, the shape of the internal space IS2 constituted by the inner cross member 10 and the rear end panel 30, that is, the shapes of the inner cross member 10 and the rear end panel 30, can be any shape as long as desired vehicle body rigidity can be obtained. Can be taken.
In the above embodiment, the striker attachment portion 12A of the inner cross member 10 to which the striker 50 is attached is reinforced by the extension flange 23 of the inner cross member 10 and the connection reinforcing plate 60. The flange 23 may be eliminated and the reinforcement may be reinforced only by the connection reinforcing plate 60.

It is a schematic perspective view which shows the rear part structure of the vehicle body by embodiment of this invention. It is a schematic perspective view which shows the rear part structure of the vehicle body of FIG. 1 which attached the inner cross member. FIG. 2 is a schematic perspective view showing a rear structure of the vehicle body of FIG. 1 with an outer cross member attached. It is a schematic perspective view which shows the rear part structure of the vehicle body of FIG. 1 which attached the rear end panel. It is a schematic sectional drawing in the VV line | wire of FIG. It is a schematic sectional drawing in the VI-VI line of FIG.

Explanation of symbols

4 Rear side frame 10 Inner cross member (first rear cross member)
20 Outer cross member (second rear cross member)
30 Rear end panel

Claims (4)

A vehicle body rear structure,
Left and right rear side frames extending in the longitudinal direction of the vehicle,
A first rear cross member connecting the rear end portions of the left and right rear side frames;
A rear end panel that is disposed behind the first rear cross member in the vehicle front-rear direction and forms a closed cross section that extends in the vehicle width direction together with the first rear cross member;
Provided behind face in the vehicle front and rear direction of the first rear cross member, we have a second rear cross member for connecting the said left, rear portion of the right rear side frame via the first rear cross member,
A vehicle body rear structure in which the first rear cross member and the second rear cross member constitute a closed cross section extending in the vehicle width direction . The closed cross-section formed between the first rear cross member by said rear end panel, the greater than configured closed cross section and the first rear cross member by a second rear cross member, the rear vehicle body according to claim 1, wherein Construction. The first rear cross member includes a locking member for locking the rear gate attached to the rear gate opening of the vehicle so as to be freely opened and closed;
A connection reinforcing means for connecting the locking member mounting portion of the first rear cross member to which the locking member is mounted and the second rear cross member;
The vehicle body rear part structure according to claim 1 or 2 . A flange that supports a part of the first rear cross member is provided at a rear end portion of the rear side frame,
Through holes are formed in the flange, the first rear cross member, and the second rear cross member, respectively, and the rear side frame and the second rear cross member are connected to the flange and the first rear cross member. The second rear cross member is fastened and fixed via a fastening member that passes through each of the through holes.
The vehicle body rear part structure according to any one of claims 1 to 3 .

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