JP5375181B2 - Rear body structure of the vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear vehicle body structure capable of simplifying a vehicle body structure around a suspension while securing supporting rigidity of a suspension for a rear wheel, and sufficiently supporting a rear differential device even when the structure is simplified. <P>SOLUTION: A suspension cross member 20, to which a suspension 10 for a rear wheel is mounted, is provided below a kick-up floor part 2c between right and left rear side frames 4, 4. This structure includes a body part 30a extending in a vehicle width direction at almost the same position above the cross member and in a vehicle forward and backward direction; and a forward extension part 30b extending forward along a tunnel part 2d from the center of the vehicle width direction of the body part 30a, and coupled with the tunnel part 2d. A rear differential device 50 is supported by the rear cross member 30 and the rear suspension cross member 20. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a structure in which a rear differential device is disposed around a rear 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.

  By the way, there is a case where a rear differential device for the rear wheel is disposed in the vicinity of the suspension for the rear wheel. Patent Document 2 discloses a suspension support member similar to the frame-shaped suspension support member described in Patent Document 1. A structure in which a rear differential device for a rear wheel is supported is disclosed.

JP 2003-137139 A JP 2002-137616 A

  By the way, in the structure described in Patent Document 1, a plurality of cross members such as a frame-like suspension support member and fourth and fifth cross members are provided in order to ensure the support rigidity of the rear wheel suspension. There was a problem that the vehicle body structure around the rear wheel suspension was complicated. Further, when the rear differential device is disposed in such a part, there is a problem that the structure around the rear suspension is further complicated.

  Accordingly, the present invention can simplify the vehicle body structure around the rear wheel suspension while ensuring the support rigidity of the rear wheel suspension, and even when simplified, the rear differential device can be supported well. It is an object of the present invention to provide a rear vehicle body structure that can be used.

  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 A rear vehicle body structure provided with a pair of left and right rear side frames extending in the longitudinal direction of the vehicle body at substantially the same height as the tunnel portion, and extending in the vehicle width direction between the left and right rear side frames, A suspension cross member to which a rear wheel suspension is attached while being connected to the rear side frame, and A main body part extending in the vehicle width direction at substantially the same position in the longitudinal direction of the vehicle body with respect to the suspension cross member and having both left and right ends connected to the rear side frame, and forward from the vehicle width direction center of the main body part to the front A rear cross member extending along the tunnel portion and having a front extending portion coupled to the tunnel portion is provided, and a rear differential device for a rear wheel is supported by the rear cross member and the suspension cross member. And the suspension cross member is formed such that an intermediate portion in the vehicle width direction is lower than both ends, and the rear differential device is disposed above the intermediate portion in the vehicle width direction of the suspension cross member and below the rear cross member. It is characterized by being arranged .

According to a second aspect of the present invention, in the rear vehicle body structure of the vehicle according to the first aspect , in the vehicle width direction between the left and right vehicle body side portions at a position spaced upward from the rear cross member. An extending deck member is provided, and a rear brace member for connecting the deck member and the rear cross member is provided.

According to a third aspect of the present invention, in the rear body structure of the vehicle according to the second aspect, the rear brace member is a substantially inverted V-shaped member extending in the vehicle width direction in rear view, Both end portions are connected to the left and right end portions of the rear cross member or the vicinity thereof, and an intermediate portion in the vehicle width direction is connected to the deck member.

  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.

Further, the rear differential device can be favorably supported by being shared by the rear cross member and the suspension cross member without providing a new support member or the like .

Further, according to the present invention , the suspension cross member has a vehicle width intermediate portion made lower than both end portions, and the rear differential device is located below the rear cross member and in the vehicle width direction of the suspension cross member. Since it is disposed above the intermediate portion, the longitudinal length of the vehicle body can be made shorter than when it is disposed in front of or behind the rear cross member or suspension cross member. That is, the vehicle body can be made compact in the front-rear direction.

According to the second aspect of the present invention, the deck member extending in the vehicle width direction is provided between the left and right vehicle body side portions at a position spaced upward from the rear cross member. The rigidity in the vehicle width direction between the side parts of the vehicle body is improved. In addition, since a rear brace member for connecting the deck member and the rear cross member is provided, the rear wheel suspension and the rear differential device peripheral portion of the vehicle body are also connected to the deck member and the vehicle body side portion via the rear brace member. As a result, the rigidity of the peripheral portion and the rigidity of the rear portion of the vehicle body are further improved.

According to the third aspect of the present invention, the rear brace member is a member that extends in the vehicle width direction in a substantially inverted V shape when viewed from the rear, and the left and right ends are the left and right ends of the rear cross member or the left and right ends thereof. Since the vehicle width direction intermediate portion is connected to the deck member while being connected in the vicinity, it plays a role of bracing in the rear vehicle body, and the torsional rigidity of the vehicle body rear portion including the rear wheel suspension peripheral portion is improved. It will be. Therefore, steering stability is improved.

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.

  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 rear suspension 10, 10 for suspending the rear wheels W, 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. A front extending portion 30b that extends forward in the interior space along the tunnel portion 2d of the floor panel 2 from the center in the width direction and is coupled to the tunnel portion 2d is provided. 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 rear suspensions 10, 10 will be described. Note that the left and right rear suspensions 10 and 10 have a symmetrical configuration, and therefore, only the left rear suspension 10 will be described as a representative. That is, as shown in FIGS. 1 to 3, the rear suspension 10 includes a wheel support 11 that rotatably supports the rear wheel W, and a front end that swings in the vicinity of the lower end of the curved portion 4 b of the resealed frame 4. A trailing arm 12 coupled to a mounting portion 11d that is supported in such a manner that its rear end protrudes inward in the vehicle width direction from the 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 in the vehicle width direction of the rear suspension cross member 20. The outer end portion of the mounting portion 11b and the inner end portion of the mounting portion 20b formed in the vicinity of the center in the vehicle width direction of the rear suspension cross member 20 are swingable. A lifting been 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, the vehicle 1 according to the present embodiment is a four-wheel drive vehicle, and rear-wheel rear differentials that distribute the power transmitted from the front of the vehicle body via the propeller shaft S to the left and right rear wheels W, W. A device 50 is supported by the rear cross member 30 and the rear suspension cross member 20.

More specifically, the rear suspension cross member 20 is formed in a substantially V shape in rear view so that the intermediate portion in the vehicle width direction is lower than both ends, and the rear differential device 50 includes the rear suspension cross member 20. upwardly and the vehicle width direction intermediate portion is disposed below the rear cross member 30. The rear cross member 30 is also formed in a substantially V shape in rear view, and the rear differential device 50 is fixed to the center portion in the vehicle width direction, which is the lowest part of the rear cross member 30, by fastening members 51, 51. Has been. Further, in this fixed state, the lower portion of the rear differential device 50 is placed at the center of the rear suspension cross member 20 in the vehicle width direction, and the rear suspension cross member 20 receives the load of the rear differential device 50. It is possible to do.

  Further, in the present embodiment, between the left and right vehicle body side portions 8 and 8, the vehicle extends in the vehicle width direction at a position spaced upward from the rear cross member 30. A deck member 60 connected to 8 is provided. The deck member 60 is formed of a closed cross-section member. It can also be configured by a member having a cross-sectional hat shape.

  In the present embodiment, a rear brace member 70 that connects the deck member 60 and the rear cross member 30 is provided. More specifically, as is apparent from FIG. 3, the rear brace member 70 is a substantially inverted V-shaped member extending in the vehicle width direction when viewed from the rear, and the left and right ends are rear cross members in the rear side frames 4 and 4. 30 is connected to the vicinity of both left and right end portions, and an intermediate portion in the vehicle width direction is connected to the deck member 60. The rear cross member 30 forms a substantially rhombus shape in rear view. The rear brace member 70 is configured by a closed cross-section member.

  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.

  Further, the rear differential device 50 can be favorably supported by being shared by the rear cross member 30 and the rear suspension cross member 20 without providing a new support member or the like.

  The rear suspension cross member 20 has a vehicle width intermediate portion that is lower than both ends, and the rear differential device 50 is disposed above the vehicle suspension direction intermediate portion of the rear suspension cross member 20 and below the rear cross member 30. Therefore, the longitudinal length of the vehicle body can be shortened compared to the case where the rear cross member 30 and the rear suspension cross member 20 are arranged in front of or behind the rear cross member 30. That is, the vehicle body can be made compact in the front-rear direction.

  Further, since the rear differential device 50 is fixed to the rear cross member 30 by the fastening members 51, 51, the rear suspension cross member whose structure is likely to be complicated by the attachment portion of the upper link 13, the attachment portion of the lower link 14, and the like. 20, it is not necessary to form a mounting portion for the rear differential device 50. That is, in the four-wheel drive vehicle having the rear differential device 50, it is possible to avoid the structure of the rear suspension cross member 20 from becoming complicated.

  Further, since the deck member 50 extending in the vehicle width direction is provided between the left and right vehicle body side portions 8 and 8 at a position spaced upward from the rear cross member 30, the vehicle width direction rigidity of the rear vehicle body is improved. . Further, since the rear brace member 70 for connecting the deck member 50 and the rear cross member 30 is provided, the rear suspensions 10 and 10 and the peripheral portion of the rear differential device 50 in the vehicle body are connected to the deck member via the rear brace member 70. 60 and the vehicle body side portions 8 and 8 are also connected, and the rigidity of the peripheral portion and the rigidity of the rear portion of the vehicle body is further improved.

  The rear brace member 70 is a substantially inverted V-shaped member extending in the vehicle width direction when viewed from the rear, and both left and right end portions are connected to the vicinity of the left and right end portions of the rear cross member 30 and the vehicle width direction intermediate portion. Is connected to the deck member 60, it plays a role of bracing in the rear vehicle body, and the torsional rigidity of the rear portion of the vehicle body including the peripheral portions of the rear suspensions 10 and 10 is improved. Therefore, steering stability is improved.

  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 simplify the vehicle body structure around the rear wheel suspension while ensuring the support rigidity of the rear wheel suspension, and even when simplified, the rear differential device can be well supported. A rear body structure can be provided and may be widely used in the automotive 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 8 Car body side part 10 Rear suspension (suspension for rear wheels)
20 Rear Suspension Cross Member (Suspension Cross Member) 30 Rear Cross Member 30a Main Body 30b Front Extension 50 Rear Differential Device 60 Deck Member 70 Rear Brace Member W Rear Wheel

Claims (3)

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 in a portion in front of the portion that constitutes 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 protruding 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 portion extending in the vehicle width direction at substantially the same position in the vehicle longitudinal direction with respect to the suspension cross member and having both left and right end portions connected to the rear side frame; and a front side from the vehicle width direction center of the main body portion A rear cross member extending along the tunnel portion and having a forward extension portion coupled to the tunnel portion,
A rear differential device for a rear wheel is supported by the rear cross member and the suspension cross member ,
The suspension cross member is formed such that an intermediate portion in the vehicle width direction is lower than both end portions,
The rear body structure of the vehicle is characterized in that the rear differential device is disposed above an intermediate portion in the vehicle width direction of the suspension cross member and below the rear cross member . In the rear body structure of the vehicle according to claim 1 ,
A deck member extending in the vehicle width direction between the left and right vehicle body side portions is provided at a position spaced upward from the rear cross member,
A rear body structure of a vehicle, comprising a rear brace member for connecting the deck member and a rear cross member. In the rear body structure of the vehicle according to claim 2 ,
The rear brace member is a substantially inverted V-shaped member extending in the vehicle width direction in rear view, and both left and right end portions are connected to the left and right end portions of the rear cross member or in the vicinity thereof, and the vehicle width direction intermediate portion. Is connected to the deck member.

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