JP2009056926A - Vehicle body rear part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reinforce a portion required with strength while suppressing weight increase of a vehicle body. <P>SOLUTION: A rear side member 1 is constituted by a front part member 3 and a rear part member 5, the front part member 3 is provided with a suspension support part 3c for mounting a front end boss part 9a of a trailing arm 9, and strength is enhanced by making plate thickness thicker than the rear part member 5. A side sill 7 is joined/fixed to an outer side of the vehicle body of the front part member 3, and the front end boss part 9a of the trailing arm 9 is arranged between a bracket 15 joined to an inner side of a rear end of the side sill 7 and the suspension support part 3c. A closed cross section-forming member 17 becoming a reinforcement member is provided between the front part member 3 and the side sill 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle body rear structure including a rear side member.

As a conventional rear body structure of a vehicle body, for example, the one described in Patent Document 1 below has a rear side member set as an integrated body extending in the longitudinal direction of the vehicle body.
JP 2001-247056 A

  By the way, in the above-described conventional vehicle body rear structure, in order to reinforce the portion where the strength of the rear side member is required, it is necessary to increase the thickness of the entire rear side member of the integrated body or to attach the reinforcing member to the necessary portion as appropriate. As a result, there is a problem that the vehicle weight increases.

  Accordingly, an object of the present invention is to reinforce a portion where the strength of the rear side member is required while suppressing an increase in the weight of the vehicle body.

  The present invention relates to a rear side member that is positioned on the side in the vehicle width direction of the rear part of the vehicle body and extends in the longitudinal direction of the vehicle body, a front member that is located on the front side of the vehicle body, and a rear member that is coupled to the vehicle body rear side of the front member The main feature is that the front member is provided with a suspension support portion for supporting the rear suspension.

  According to the present invention, by increasing the thickness of only the front member having the suspension support portion that requires the strength of the rear side member, it is possible to reinforce the portion that requires strength while suppressing an increase in the weight of the vehicle body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a vehicle body rear structure showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. In FIG. 1, the direction indicated by the arrow RR is the rear of the vehicle body, the direction indicated by the arrow UPR is the upper side of the vehicle, and the direction indicated by the arrow OTR is the outer side of the vehicle (right side in the vehicle width direction).

  In FIG. 1, a rear side member 1 that is located on the side in the vehicle width direction of the rear part of the vehicle body and extends in the longitudinal direction of the vehicle body is coupled to a front member 3 that is located on the front side of the vehicle body and to the vehicle body rear side of the front member 3. The side sill 7 extending in the longitudinal direction of the vehicle body is joined and fixed to the outside of the vehicle body of the front member 3.

  The rear member 5 of the rear side member 1 includes a bottom wall 5a, left and right side walls 5b and 5c extending upward from both side edges of the bottom wall 5a, and a flange 5d protruding outward from the upper end of the left side wall 5b.

  On the other hand, the front member 3 of the rear side member 1 includes a vertical wall 3a on the inner side of the vehicle body and a bottom wall 3b that bends and extends toward the outer side of the vehicle body in a substantially half region on the front side of the vehicle body below the vertical wall 3a. I have.

  A suspension support portion 3c for attaching and supporting the trailing arm 9 of the rear suspension shown in FIG. 1 is provided below the portion of the vertical wall 3a that protrudes rearward of the vehicle body from the bottom wall 3b. The suspension support portion 3c is provided with a through hole 3d into which the attachment support pin 11 is inserted. The attachment support pin 11 is formed in the support hole 9b formed in the through hole 3d and the front end boss portion 9a of the trailing arm 9. Inserted into.

  Further, in a region excluding a part of the upper edge of the vertical wall 3a on the vehicle body rear side, a flange 3e that is bent toward the vehicle body inner side is provided, and a portion that protrudes rearward from the bottom wall 3b of the vertical wall 3a The upper part 3f is joined and fixed from the outside of the side wall 5b of the rear member 5, and the joined front part 3 and rear part 5 constitute a rear side member 1 extending in the longitudinal direction of the vehicle body. At this time, the flange 3e of the front member 3 and the flange 5d of the rear member 5 form substantially the same surface, and the floor panel 13 omitted in FIG. 1 (see FIG. 3) is formed on each of the flanges 3e and 5d. ) Is fixed.

  The side sill 7 is attached so as to be opposed to the vertical wall 3a while standing from the side edge of the bottom wall 3b of the front member 3. The side sill 7 is opposed to the vertical wall 3a and from the upper and lower ends of the side wall 7a to the outside of the vehicle body. An upper wall 7b and a lower wall 7c that bend and extend toward the top, and flanges 7d and 7e that extend upward and downward from respective tips of the upper wall 7b and the lower wall 7c, respectively.

  FIG. 3A is a cross-sectional view corresponding to a cross section taken along line AA in FIG. 1, and the lower wall 7 c of the side sill 7 is located on the bottom wall 3 b of the front member 3 and is fixedly bonded. Yes. FIG. 3B is a cross-sectional view corresponding to a cross section taken along line BB in FIG.

  The floor panel 13 joined and fixed on the flanges 3e and 5d of the front member 3 and the rear member 5 is also placed and fixed on the upper wall 7b of the side sill 7. Further, as shown in FIG. 3 (b), an end of the rear panel 5 on the side wall 5c side of the floor panel 13 becomes a flange 13a that is bent upward and extends further upward from the side wall 5c. It is fixedly bonded to the projecting flange 5e.

  As shown in FIG. 4, a bracket 15 is joined and fixed to the inside of the vehicle body on the vehicle rear side of the side sill 7 described above, and a protruding end portion 15 a protruding rearward of the bracket 15 is a side wall on the vehicle outer side of the rear member 5. It is fixed to 5c by joining from the outside. That is, the left and right side walls 5b and 5c of the rear member 5 are sandwiched between the protruding end portion 15a of the bracket 15 and the upper portion 3f of the front member 3.

  Further, a through hole 7f and a through hole 15b that are aligned with each other in the joined state are provided below the joint portion of the side sill 7 and the bracket 15, and the portion provided with the through hole 15b is a suspension support portion in the bracket 15. 15c.

  Then, the left and right side walls 5b and 5c of the rear member 5 are sandwiched and fixed by the protruding end portion 15a of the bracket 15 and the upper portion 3f of the front member 3, as described above, and the suspension support portion on the front member 3 side. The front end boss portion 9a of the trailing arm 9 shown in FIG. 1 is disposed between the bracket 3c and the suspension support portion 15c on the bracket 15 side, and in this arrangement state, the mounting support pin 11 is supported by the through hole 3d. By sequentially inserting the holes 9b and the through holes 15b and 7f, the front end boss portion 9a of the trailing arm 9 is rotatably supported with respect to the mounting support pin 11.

  FIG. 5 is a perspective view showing a state in which the front end boss portion 9 a of the trailing arm 9 is disposed between the front member 3 and the bracket 15. Note that a rear end boss portion (not shown) of the trailing arm 9 is connected to a rear suspension of the rear wheel.

  Further, as shown in FIG. 3A, a closed cross-section forming member 17 as a reinforcing member is provided at a substantially central position in the vertical direction between the vertical wall 3a of the front member 3 and the side wall 7a of the side sill 7. . The closed cross-section forming member 17 has flanges 17a and 17b bent upward on the left and right sides, respectively, joined and fixed to the vertical wall 3a of the front member 3 and the side wall 7a of the side sill 7, respectively. The side sill 7 and the reinforcing member 17 form a closed cross section.

  The rear end of the closed cross-section forming member 17 is bonded and fixed to the lower front end of the rear member 5 as shown in FIG. Further, a bulkhead 19 as a reinforcing member is provided as a partition member so as to close the above-described closed cross-section portion below the rear end of the closed cross-section forming member 17.

  That is, the bulkhead 19 has an upper flange 19a on the lower surface of the rear end of the closed section forming member 17, a left flange 19b on the vertical wall 3a of the front member 3, a right flange 19c on the side wall 7a of the side sill 7, and a lower flange. 19 d is joined and fixed to the bottom wall 3 b of the front member 3. Further, as shown in FIG. 5, the vicinity of the rear surface of the right flange 19 c is joined and fixed to the front end flange 15 d of the bracket 15.

  Further, as shown in FIG. 3A, a jig serving as a jig receiving portion when assembling other vehicle body parts such as the floor panel 13 to the rear side member 1 on the bottom wall 3 b of the front member 3. A receiving hole 3g is provided. By inserting the positioning pin 21a of the jig 21 into the jig receiving hole 3g, the assembly work of the vehicle body parts is performed in a state where the rear side member 1 is supported by the jig 21.

  Further, a hook hooking hole 3h for hooking a hook (not shown) to the bottom wall 3b on the vehicle body front side from the jig receiving hole 3g when a vehicle having the rear structure of the vehicle body is transported by another transporting vehicle. Is provided. A reinforcing plate 23 having a through hole 23a is attached to the hook hooking hole 3h from above.

  A spring fixing bracket 25 that supports a spring (not shown) of the rear suspension is attached to the lower surface of the rear member 5 on the vehicle body rear side.

  As shown in FIG. 3B, bolts and nuts 31 are provided in the vicinity of the edge of the floor panel 13 at a position corresponding to the rear member 5 so as to sandwich L-shaped seat belt anchors 27 and 29 from above and below. It is attached by. Of these, the end of the seat belt 33 is connected to a mounting flange 27a that bends upward of the upper seat belt anchor 27. A connection flange 29 a that is bent downward of the lower seat belt anchor 29 is bonded and fixed to the inner surface of the side wall 5 c of the rear member 5.

  Further, a brake hose bracket 35 for attaching a rear brake hose (not shown) is joined and fixed to the outside of the side wall 5c of the rear member 5.

  In the vehicle body rear structure as described above, the rear side member 1 is divided into the front member 3 provided with the suspension support portion 3c located on the front side of the vehicle body and the rear member 5 on the rear side of the vehicle body. Only the front member 3 having the suspension support portion 3c can be thickened, and the rear member 5 only needs to have the original function as a vehicle body skeleton member. As a result, it is possible to reinforce a portion requiring strength while suppressing an increase in the weight of the vehicle body.

  Further, since the suspension support portion 3c is provided integrally with the front member 3, there is no need to provide a dedicated bracket for suspension support as a separate member, which can contribute to a reduction in the number of parts and suspension support. The accuracy management of the part 3c is also facilitated.

  For example, when the suspension support portion 3c is provided as a suspension support bracket as a separate member from the rear side member 1 (front member 3), the accuracy of the suspension support bracket itself, the coupling accuracy between the suspension support bracket and the rear side member 1, It is necessary to determine the accuracy of the connection between the rear side member 1 and the floor panel 13 and the accuracy in three steps, which makes it difficult to achieve accuracy from the viewpoint of cumulative variation.

  Further, the front member 3 of the rear side member 1 has a vertical wall 3a inside the vehicle body and a bottom wall 3b extending from the lower part of the vertical wall 3a to the vehicle body outside, and rises from a side edge of the bottom wall 3b. Since the side sill 7 facing the vertical wall 3a is joined and fixed, the side sill 7 closes the open side of the front member 3 outside the vehicle body, increasing the strength of the front member 3, and consequently the strength around the suspension support portion 3c. Can be increased.

  Since the bottom wall 3b of the front member 3 provided with the suspension support portion 3c described above is provided with a jig receiving hole 3g serving as a jig receiving portion when assembling a floor panel 13 or the like as another vehicle body part. In the process, the mounting accuracy of the trailing arm 9 can be increased.

  The lower wall 7c, which is the lower horizontal surface of the side sill 7, and the bottom wall 3b, which is the lower horizontal surface of the front member 3 of the rear side member 1, are joined to each other as substantially the same plane as shown in FIG. , The rigidity is improved, and it can contribute to the improvement of sound vibration and steering stability.

  Further, the trailing arm 9 can be supported more reliably by configuring the suspension support portions 15c and 3c with the bracket 15 fixed to the side sill 7 and the front member 3 of the rear side member 1.

  Furthermore, since the closed cross-section forming member 17 and the bulkhead 19 that are reinforcing members are provided between the side sill 7 and the front member 3 of the rear side member 1, the strength around the suspension support portion 3c can be further increased.

  The closed cross-section forming member 17 described above is located at a position facing the bottom wall 3b of the front member 3 and forms a closed cross-section between the front member 3 and the side sill 7, so that the strength around the suspension support portion 3c is increased. Can be further enhanced.

  Further, by providing the bulkhead 19 that is a partition member that closes the closed cross section as a reinforcing member, the strength around the suspension support portion 3c can be further increased.

It is a perspective view of the body rear part structure which shows one Embodiment of this invention. It is a disassembled perspective view of the vehicle body rear part structure of FIG. (A) is sectional drawing equivalent to the AA sectional view of FIG. 1, (b) is sectional drawing equivalent to the BB sectional view of FIG. FIG. 2 is a perspective view showing a state in which a bracket is joined and fixed to the inside of the vehicle body on the vehicle rear side of the side sill in the vehicle body rear structure of FIG. 1. FIG. 2 is a perspective view showing a state in which a front end boss portion of a trailing arm is disposed between a front member and a bracket in the vehicle body rear structure of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear side member 3 Front member of rear side member 3a Vertical wall of front member 3b Bottom wall of front member (lower horizontal surface of front member)
3c Suspension support part of front member 3g Jig receiving hole (jig receiving part) of front member
5 Rear member of rear side member 7 Side sill 7c Lower wall of side sill (lower horizontal surface of side sill)
9 Trailing arm (rear suspension)
13 Floor panel (other body parts)
15 Bracket 15c Bracket suspension support member 17 Closed cross-section forming member (reinforcing member)
19 Bulkhead (bulk member, reinforcing member)

Claims (9)

  A rear side member that is located on the side in the vehicle width direction of the rear part of the vehicle body and extends in the longitudinal direction of the vehicle body is divided into a front member that is located on the front side of the vehicle body and a rear member that is coupled to the rear side of the vehicle body of the front member. The vehicle body rear structure is characterized in that the front member is provided with a suspension support portion for supporting a rear suspension.   The vehicle body rear part structure according to claim 1, wherein the front member has higher strength than the rear member.   The front member has a vertical wall inside the vehicle body and a bottom wall extending from the lower part of the vertical wall to the outside of the vehicle body, and a side sill is provided to face the vertical wall so as to rise from a side edge of the bottom wall. The vehicle body rear part structure according to claim 1 or 2, wherein   The vehicle body rear structure according to any one of claims 1 to 3, wherein a jig receiving portion for assembling other vehicle body parts is provided on the front member including the suspension support portion.   The vehicle body rear structure according to claim 3 or 4, wherein a lower horizontal surface of the side sill and a lower horizontal surface of a front member of the rear side member are substantially flush with each other.   The vehicle body rear part structure according to any one of claims 3 to 5, wherein the suspension support part is configured by a bracket fixed to the side sill and a front part member of the rear side member.   The vehicle body rear part structure according to any one of claims 3 to 6, wherein a reinforcing member is provided between the side sill and a front member of the rear side member.   The said reinforcement member is in the position which opposes the bottom wall of the said front part member, Comprising: It is a closed cross-section formation member which forms a closed cross section with the said front part member and a side sill. Car body rear structure.   The vehicle body rear part structure according to claim 7 or 8, wherein the reinforcing member is a partition member that closes the closed cross section.

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