JP2010195257A - Rear body structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear body structure of a vehicle capable of simplifying a body structure around a suspension while securing the rigidity of the suspension for a rear wheel. <P>SOLUTION: The rear body structure includes a suspension cross member 20 which is provided between right and left side frames 4, 4, both right and left ends of which are connected to the rear side frames 4, 4 below a kickup floor 2c and to which a suspension 10 for a rear wheel is mounted, and extending in the vehicle lateral direction between right and left rear side frames at a lower part of a kick-up floor. The rear body structure includes a rear cross member 30 having a body 30a extending in the vehicle lateral direction at an upper part with respect to the cross member 20 and at the substantially same position in the vehicle longitudinal direction having right and left both ends connected to the rear side frames 4, 4 and a forward extending portion 30b extending along a tunnel 2d from the vehicle lateral direction center of the body 30a forward, and connected to the tunnel 2d. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a structure around a rear wheel suspension in a rear body of a vehicle, and belongs to the technical field of the body structure.

  For example, as disclosed in Patent Document 1, a kick-up floor portion (corresponding to the rear floor of Patent Document 1) raised in a step shape is provided at the rear portion of the floor panel constituting the floor surface of the passenger compartment. In addition, a tunnel portion that extends in the vehicle front-rear direction at the center in the vehicle width direction and that protrudes upward may be formed in a portion of the floor panel that is ahead of the portion constituting the kick-up floor portion. Further, in Patent Document 1, a pair of left and right rear side frames extending in the vehicle front-rear direction at a substantially height position with respect to the tunnel portion are provided below the portion constituting the kick-up floor portion in the floor panel, and these rear sides are provided. A structure is disclosed in which a suspension support member for attaching a rear wheel suspension is provided between the frames in the vicinity of the rear of the tunnel portion.

  Here, the periphery of the rear wheel suspension in the rear part of the vehicle body is required to have a support rigidity capable of receiving a load input from the rear wheel suspension. Therefore, in Patent Document 1, the suspension support member is connected between a pair of left and right front and rear frame portions extending front and rear along the lower surfaces of the left and right rear side frames, and the vicinity of the front end portion and the vicinity of the rear end portion of the front and rear frame portions. A frame-like structure composed of a pair of front and rear horizontal frame portions that extend in the vehicle width direction at substantially the same position above the suspension support member and in the vehicle body front-rear direction to connect the left and right rear side frames, There is disclosed a structure in which a fifth cross member is provided and a rear end portion of the tunnel portion is connected to a center portion in the vehicle width direction of the fourth cross member.

JP 2003-137139 A

  By the way, in the structure described in Patent Document 1, a suspension support member having a frame-like structure and a plurality of cross members such as fourth and fifth cross members are provided in order to ensure the support rigidity of the rear wheel suspension. There has been a problem that the vehicle body structure around the rear wheel suspension is complicated.

  Accordingly, an object of the present invention is to provide a rear vehicle body structure that can simplify the vehicle body structure around the suspension while ensuring the support rigidity of the suspension for the rear wheel.

  In order to solve the above-described problems, the present invention is configured as follows.

  First, the invention according to claim 1 of the present application is provided with a kick-up floor portion raised in a step shape at the rear portion of the floor panel constituting the floor surface of the passenger compartment, and the kick-up floor in the floor panel. In the front part of the part constituting the part, a tunnel part extending in the vehicle longitudinal direction at the center in the vehicle width direction and protruding upward is formed, and below the part constituting the kick-up floor part in the floor panel In the rear body structure of the vehicle provided with a pair of left and right rear side frames extending in the longitudinal direction of the vehicle body at substantially the height position with the tunnel portion, between the left and right rear side frames, in the vicinity of the rear of the tunnel portion, Suspension that extends in the vehicle width direction and has left and right ends connected to the rear side frame and to which a rear wheel suspension is attached A main body portion provided with a cross member and extending in the vehicle width direction at substantially the same position above the suspension cross member in the front-rear direction of the vehicle body and having both left and right ends connected to the rear side frame; A rear cross member is provided that has a forward extending portion that extends forward from the center in the width direction along the tunnel portion and is coupled to the tunnel portion.

  According to a second aspect of the present invention, in the rear body structure of the vehicle according to the first aspect of the present invention, the body portion of the rear cross member is positioned forward in the vehicle width direction from both ends. It is formed in a square shape in a plan view.

  According to a third aspect of the present invention, in the rear body structure of the vehicle according to the first or second aspect, the tunnel portion is crossed on the upper surface of a portion of the floor panel in front of the kick-up floor portion. A floor cross member extending in the vehicle width direction is provided, and a front end portion of a front extending portion of the rear cross member is connected to the floor cross member.

  According to a fourth aspect of the present invention, in the rear vehicle body structure of the vehicle according to any one of the first to third aspects, a fuel tank is disposed below the forward extending portion of the rear cross member. It is characterized by being.

  According to a fifth aspect of the present invention, in the rear body structure of the vehicle according to the fourth aspect, when an impact load is input to the front extension portion of the rear cross member from the front-rear direction of the vehicle body, A deformation control unit that deforms the extending portion in a direction away from the fuel tank is provided.

  Next, the effect of the present invention will be described.

  According to the first aspect of the present invention, the load input from the rear wheel to the rear wheel suspension is not limited to the suspension cross member, but is substantially the same position above the suspension cross member and in the longitudinal direction of the vehicle body. A rear cross member that extends substantially in the vehicle width direction and is received by the main body, and a front extension portion that extends forward from the vehicle width direction center of the main body along the tunnel portion and is coupled to the tunnel portion. It is also distributed to the tunnel part. In that case, the tunnel part is generally a particularly rigid part in the vehicle body, and since the front extension part is provided along the tunnel part and combined, a large amount of load can be dispersed, and the patent There is no need to provide a frame-like suspension support member and a plurality of cross members unlike those described in Document 1. That is, the vehicle body structure around the rear wheel suspension can be simplified while securing the suspension support rigidity.

  In addition, according to the invention described in claim 2, for example, when a rear collision occurs in the rear portion of the vehicle body of the host vehicle, the rear collision resistance can be improved. In other words, when there is a rear collision, the impact load is distributed to the front vehicle body via the rear side frame. However, in the present invention, the rear cross member body portion has the vehicle width direction center side forward of both end portions. Since it is formed in a square shape in plan view so as to be positioned, it is easily dispersed from the rear side frame to the main body portion of the rear cross member. In addition, the dispersed load is easily input to the tunnel portion through the forward extending portion. That is, the impact load input to the rear side frame at the time of the rear impact can be easily dispersed in the highly rigid tunnel portion, and the rear impact resistance performance is improved.

  According to the invention of claim 3, a floor cross member extending in the vehicle width direction across the tunnel portion is provided on the upper surface of the front portion of the floor panel relative to the kick-up floor portion. Since the front end portion of the front extending portion of the rear cross member is connected to the floor cross member, the load input to the suspension can also be distributed to the floor cross member.

  According to the fourth aspect of the present invention, the fuel tank is disposed below the front extension portion of the rear cross member, that is, below the portion of the vehicle body having a high longitudinal rigidity in the vehicle body. The protection performance of the fuel tank is improved.

  Here, when the impact load of the front-rear protrusion is large, there is a possibility that the front extension part having high front-rear direction rigidity may be deformed. When the forward extending portion is deformed downward, for example, there is a possibility that the fuel tank may be damaged due to contact with the fuel tank, and this needs to be prevented.

  Therefore, in the invention described in claim 5, when the impact load is input to the front extending portion of the rear cross member from the front-rear direction of the vehicle body, the deformation control is performed to deform the front extending portion in a direction away from the fuel tank. According to this, it is possible to prevent the forward extension portion from being deformed downward when an impact load is input from the rear of the vehicle body. That is, damage to the fuel tank due to the downward deformation of the forward extending portion is prevented.

1 is a partially broken plan view of a rear body (lower part) of a vehicle according to an embodiment of the present invention (a floor panel is partially broken). It is a side view of the rear vehicle body. It is AA sectional drawing of FIG. It is explanatory drawing of the effect | action at the time of a rear collision.

  Hereinafter, a rear body structure of a vehicle according to an embodiment of the present invention will be described.

  FIG. 1 is a partially broken plan view of a rear vehicle body of a vehicle 1 according to an embodiment of the present invention, and FIG. 2 is a side view of the rear vehicle body. As shown in these drawings, the floor panel 2 constituting the floor of the passenger compartment has a front floor portion 2a on which a front seat and a rear seat are disposed, and upward from a rear end of the front floor portion 2a. It has a vertical wall portion 2b that rises, and a kick-up floor portion 2c that extends rearward from the upper end of the vertical wall portion 2b and is raised stepwise with respect to the front floor portion 2a. The kick-up floor portion 2c can be used as, for example, a luggage compartment. The rear side of the floor panel 2 is narrower in the vehicle width direction than the front side, and rear wheels W, W are arranged on the sides.

  At the center of the front floor portion 2a in the vehicle width direction, there is provided a tunnel portion 2d that extends in the longitudinal direction of the vehicle body and rises upward to substantially the same height as the kick-up floor portion 2c. Further, side sills 3 and 3 extending in the longitudinal direction of the vehicle body are provided on the left and right sides of the front floor portion 2a. The side sill 3 has a closed cross-sectional structure extending in the longitudinal direction of the vehicle body.

  Further, rear side frames 4, 4 extending in the front-rear direction of the vehicle body along the left and right side portions of the floor panel 2 are provided on the lower surface side of the rear portion of the floor panel 2. The rear side frames 4, 4 are connected to the side sills 3, 3 at the front end and are curved so as to follow the lower surface of the floor panel 2. The rear frame 4 a below the kick-up floor 2 c The floor panel 2 extends in the longitudinal direction of the vehicle body at substantially the same height as the tunnel portion 2d. Here, as the rear side frame 4, in this embodiment, a rectangular pipe material having a rectangular cross section is used. In addition, you may make it comprise a closed cross section with the floor panel 2, for example using the cross-sectional hat-shaped member.

  Between the left and right side sills 3, 3, traverse the tunnel portion 2 d (through) at the upper surface side of the front floor portion 2 a of the floor panel 2 and at the front end positions of the left and right rear side frames 4, 4 in the front-rear direction. A floor cross member 5 extending in the vehicle width direction and having left and right end portions connected to the left and right side sills 3 and 3 and the rear side frames 4 and 4 is provided. The floor cross member 5 is configured by a hat-shaped member, and forms a closed cross section with the upper surface of the floor panel 2.

  On the lower surface side of the front floor portion 2a of the floor panel 2, a pair of left and right floor frames 6, 6 extending substantially in the vehicle longitudinal direction are provided in front of the floor cross member 5 and between the side sill 3 and the tunnel portion 2d. The rear ends of the floor frames 6 and 6 are connected to the floor cross member 5 via the floor panel 2.

  Next, the structure around the suspensions 10 and 10 for suspending the rear wheels W and W will be described.

  That is, as shown in FIGS. 1 to 3, between the rear frame portions 4a of the left and right rear side frames 4, 4, it extends in the vehicle width direction in the vicinity of the rear of the tunnel portion 2d, and both end portions thereof are the rear frame portions. Rear suspension cross members 20, 20 connected to the lower surfaces of 4a, 4a are provided. As apparent from FIG. 3, the rear suspension cross members 20, 20 are substantially V-shaped when viewed from the rear, with the center in the vehicle width direction being lower than both ends. In the present embodiment, as the rear suspension cross member 20, for example, a square pipe member having a rectangular cross section is used. For example, a hat-shaped member may be used.

  A rear cross member 30 is provided above the rear suspension cross member 20. The rear cross member 30 includes a main body 30a extending in the vehicle width direction at substantially the same position in the front-rear direction with respect to the rear suspension cross member 20, and connecting the left and right rear side frames 4 and 4, and a vehicle of the main body 30a. From the center in the width direction, there is a forward extending portion 30b that extends forward along the tunnel portion 2d of the floor panel 2 and is coupled to the tunnel portion 2d. In the present embodiment, for example, a square pipe member having a rectangular cross section is used as the main body portion 30a and the front extension portion 30b of the rear cross member 30, and the rear end portion of the front extension portion 30b is the main body portion 30a. It is welded to the center in the vehicle width direction. In addition, as the main-body part 30a and the front extending | stretching part 30b, it is also possible to utilize a cross-sectional hat shape or a U-shaped member, for example, in the state which opened upwards.

  As is clear from FIG. 1, the main body portion 30 a of the rear cross member 30 is formed in a square shape in plan view so that the center side in the vehicle width direction is positioned forward of the both end portions.

  Further, the front extension part 30 b of the rear cross member 30 is connected to the center part in the vehicle width direction of the floor cross member 5 at the front end part. In that case, the front end side of the front extending portion 30 b is bent downward and connected to the floor cross member 5. That is, the curved portion 30c is provided at the front end portion of the forward extending portion 30b.

  Next, the suspensions 10, 10 will be described. Note that the left and right suspensions 10 and 10 have a bilaterally symmetrical configuration, and therefore, only the left suspension 10 will be described as a representative. That is, as shown in FIGS. 1 to 3, the suspension 10 can swing near the lower end of the curved portion 4 b of the resealed frame 4 and the wheel support 11 that rotatably supports the rear wheel W. And a trailing arm 12 coupled to a mounting portion 11d whose rear end protrudes inward in the vehicle width direction from a lower portion of the wheel support 11, and a mounting portion 11a formed on the upper portion of the wheel support 11. The outer end portion is formed at the lower portion of the wheel support 11 and the upper link 13 in which the inner end portion is swingably connected to the mounting portion 20a formed near the outer end of the rear suspension cross member 20 in the vehicle width direction. The outer end portion is supported by the mounting portion 11b and the inner end portion is swingably supported by the mounting portion 20b formed near the center of the rear suspension cross member 20 in the vehicle width direction. The a lower link 14, and a shock absorber 15 is interposed between the suspension support portion formed in the mounting portion 11c and the rear wheel house 7 formed in the lower portion of the wheel support 11. The upper link 13 and the lower link 14 are configured to be torsionally deformed when the trailing arm 12 swings. The shock absorber 15 includes a damper and a coil spring.

  Here, in the present embodiment, as shown in FIGS. 1 to 3, the fuel tank 40 is disposed below the front extending portion 30 b of the rear cross member 30. As is apparent from FIG. 3, the fuel tank has a flat shape that has substantially the same width (length in the vehicle width direction) as the kick-up floor portion 2c and has a relatively small vertical thickness. At the center in the vehicle width direction, there is a protruding portion 40a that protrudes upward toward the internal space of the tunnel portion 2d and has an upper end located in the vicinity of the lower surface of the front extending portion 30b so as to ensure as much fuel tank capacity as possible. Is provided.

  Next, functions and effects of the rear body structure of the vehicle according to the present embodiment will be described.

  That is, the load input from the rear wheel W to the rear wheel suspension 10 is not only in the rear suspension cross member 20 but also in the vehicle width direction at substantially the same position above the suspension cross member 20 and in the vehicle longitudinal direction. The main body 30a of the extending rear cross member 30 is shared and received, and the front extending portion 30b that extends forward from the vehicle width direction center of the main body 30a along the tunnel 2d and is coupled to the tunnel 2d. Therefore, it is also distributed to the tunnel part 2d. In that case, the tunnel part 2d is a particularly rigid part in the vehicle body, and the front extension part 30b is provided and coupled along the tunnel part 2d, so that a large amount of load can be dispersed. Thus, unlike the one described in Patent Document 1, it is not necessary to provide a frame-like suspension support member and a plurality of cross members. That is, the vehicle body structure around the rear wheel suspension can be simplified while ensuring the support rigidity of the rear suspensions 10 and 10.

  Further, for example, the rear-end collision resistance when the rear portion of the vehicle body of the host vehicle 1 has a rear-end collision is also improved. That is, when there is a rear collision, the impact load is distributed to the front vehicle body via the rear side frames 4 and 4, but in the present embodiment, the main body 30a of the rear cross member 30 is centered in the vehicle width direction. As shown by an arrow α in FIG. 1, the rear side is formed in a square shape in plan view so that the side is positioned in front of both ends. It is easy to disperse from the frames 4, 4 to the main body 30 a of the rear cross member 30. Further, as indicated by an arrow β, the dispersed load is easily input to the tunnel portion 2d through the forward extending portion 30b. That is, the impact load input to the rear side frames 4 and 4 at the time of the rear impact can be easily dispersed in the highly rigid tunnel portion 2d, and the rear impact resistance performance is improved.

  A floor cross member 5 extending in the vehicle width direction across the tunnel portion 2d is provided on the floor panel 2 in front of the kick-up floor portion 2c, and the front end of the front extension portion 30b of the rear cross member 30 is provided. Since the portion is connected to the floor cross member 5, the load input to the suspensions 10, 10 can also be distributed to the floor cross member 5.

  In addition, the fuel tank 40 is disposed below the front extending portion 30b of the rear cross member 30, that is, below a portion of the vehicle body having a high vehicle body front-rear direction rigidity. improves.

  Here, when the impact load of the front-rear protrusion is large, there is a possibility that the front extending portion 30b having high front-rear direction rigidity may be deformed. When the forward extending portion 30b is deformed downward, for example, the fuel tank 40 may be damaged due to contact with the fuel tank 40, which needs to be prevented. In particular, when the protrusion 40a is provided in the fuel tank 40, this is an important problem.

  Therefore, in the present embodiment, the curved portion 30c (deformation control portion) is provided on the front end side of the front extending portion 30b of the rear cross member 30, and according to this, the vehicle body is attached to the rear body of the host vehicle 1. When an impact load is input from the front-rear direction, the rear end side of the rear side frame 4 (the rear end of the vehicle body is shown, for example, as shown in FIG. When the deformation occurs such that the side) is lifted upward, a force in the direction indicated by the arrow γ acts on the curved portion 30c, and as a result, the forward extending portion 30b moves away from the fuel tank 40 (upward). ) Will be deformed. Therefore, the fuel tank 40 is prevented from being damaged by the forward extending portion 30b. Further, since the front end portion of the front extension portion 30b is connected to the floor cross member 5, the front end of the front extension portion 30b cannot move forward, and as a result, the force indicated by the arrow γ further acts on the bending portion 30c. It becomes easy and this effect will be obtained more reliably.

  In the present embodiment, the rear suspension has a trailing arm, but the present invention is not limited to this and can be applied to other types of rear suspension. .

  The tunnel portion may be provided with a tunnel reinforcement that extends in the longitudinal direction of the vehicle body between the front end and the rear end and reinforces the tunnel portion. In this case, the effect of the present invention becomes more remarkable. For example, in the thing of patent document 1, although the tunnel reinforcement is provided along the upper surface of the top part of a tunnel part, even if it provides the forward extension part of this invention in such a thing, tunnel rain is provided. There is no interference with the forcemen. It is also conceivable to provide a tunnel reinforcement along the lower surface of the top of the tunnel part. In this case, the front extension part is extended forward under this to avoid interference with the tunnel reinforcement. be able to.

  The present invention can provide a rear vehicle body structure that can simplify the vehicle body structure around the suspension while ensuring the support rigidity of the suspension for the rear wheel, and may be widely used in the automobile industry.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Floor panel 2c Kick-up floor part 2d Tunnel part 4 Rear side frame 5 Floor cross member 10 Rear suspension (suspension for rear wheels)
20 Rear Suspension Cross Member (Suspension Cross Member) 30 Rear Cross Member 30a Main Body 30b Front Extending Section 30c Curved Section (Deformation Control Section)
40 Fuel tank W Rear wheel

Claims (5)

A kick-up floor portion that is raised stepwise is provided at the rear of the floor panel that constitutes the floor surface of the passenger compartment, and the vehicle is disposed at a portion in front of the portion constituting the kick-up floor portion in the floor panel. A tunnel portion extending in the longitudinal direction of the vehicle body at the center in the width direction and formed upward is formed, and below the portion constituting the kick-up floor portion in the floor panel, the vehicle body A vehicle rear body structure provided with a pair of left and right rear side frames extending in a direction,
Between the left and right rear side frames, there is provided a suspension cross member that extends in the vehicle width direction and has left and right ends connected to the rear side frame and to which a rear wheel suspension is attached.
A main body that extends in the vehicle width direction at substantially the same position in the vehicle longitudinal direction with respect to the suspension cross member, and that the left and right ends are connected to the rear side frame; And a rear cross member having a front extension portion coupled to the tunnel portion and extending along the tunnel portion. In the rear body structure of the vehicle according to claim 1,
The rear body structure of the vehicle is characterized in that the main body portion of the rear cross member is formed in a U-shape in a plan view so that a central portion in the vehicle width direction is positioned forward of both ends. In the rear vehicle body structure of the vehicle according to claim 1 or 2,
A floor cross member extending in the vehicle width direction across the tunnel portion is provided on the upper surface of the front portion of the floor panel from the kick-up floor portion,
A rear body structure of a vehicle, wherein a front end portion of a front extending portion of the rear cross member is connected to the floor cross member. In the rear body structure of the vehicle according to any one of claims 1 to 3,
A rear body structure of a vehicle, wherein a fuel tank is disposed below a front extending portion of the rear cross member. In the rear body structure of the vehicle according to claim 4,
The front cross section of the rear cross member is provided with a deformation control section that deforms the front stretch section in a direction away from the fuel tank when an impact load is input from the front-rear direction of the vehicle body. Rear body structure of the vehicle.

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