JP6519003B2 - Mounting structure of trailing arm - Google Patents

Description

  The present invention relates to a trailing arm attachment structure for firmly attaching a trailing arm that constitutes a rear suspension device to a vehicle body.

  In general, a suspension device mounted on a vehicle serves to cushion the impact from the road surface to improve ride comfort and secure the grounding property of the tire during cornering to hold the wheel in the correct direction. . As such suspension devices, various types are provided, and for example, a trailing arm type rear suspension device having a pair of left and right trailing arms is known.

  The above-mentioned trailing arm has its tip end rotatably supported by a vehicle such as a side member via a bracket, while its base end is connected to the rear wheel side, thereby swinging the rear wheel in the vertical direction It supports possible. At this time, it is general that the leading end of the trailing arm is rotatably attached to a bracket attached to the vehicle body. And as such a conventional attachment structure of a trailing arm, it is disclosed by patent document 1, 2, for example.

JP, 2000-313361, A JP 2007-186055 A

  By the way, loads in all directions are input to the bracket that supports the trailing arm from the rear suspension device via the trailing arm. Thereby, in the bracket, it is difficult to secure the rigidity only by the thickness of the bracket, and it is necessary to connect the bracket and the vehicle body by a plurality of reinforcing members as in the above-mentioned conventional mounting structure. . However, when a plurality of reinforcing members are provided, the number of parts is increased, which causes not only an increase in manufacturing cost and weight but also a complicated structure.

  Also, in recent years, among electrically powered vehicles such as electric vehicles, vehicles equipped with a large drive battery are increasing. In such an electric vehicle, since the vehicle body weight is heavy because the large drive battery is mounted, it is necessary to further improve the mounting rigidity of the trailing arm.

  Therefore, the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a mounting structure of a trailing arm capable of improving the mounting rigidity of the trailing arm to a vehicle body in a vehicle provided with a drive battery. Do.

The mounting structure of the trailing arm according to the first invention for solving the above-mentioned problems is
A tray supporting a battery pack for storing a drive battery between a pair of left and right rear side members extending in the longitudinal direction of the vehicle at a rear portion of the vehicle body and connecting a trailing arm of a rear suspension device to the rear side member Ring arm mounting structure,
An attachment member provided on the rear side member and rotatably supporting a leading end of the trailing arm in the vertical direction of the vehicle body;
A cross member extending in the vehicle width direction on the vehicle body front side of the mounting member and joined to the rear side member;
Provided on the vehicle body rear side of the mounting member, and a bracket for fixing the battery pack to the rear side member,
The front end portion of the mounting member is supported by the cross member, and the rear end portion of the mounting member is supported by the bracket.

The mounting structure of the trailing arm according to the second invention for solving the above-mentioned problems is
The mounting member is
An inner panel joined to the inner surface of the rear side member in the vehicle width direction and extending in the longitudinal direction of the vehicle body;
And an outer panel provided on the outer side in the vehicle width direction of the inner panel and supporting the leading end of the trailing arm with the inner panel.
The front end portion of the inner panel is supported by the cross member, and the rear end portion of the inner panel is supported by the bracket.

The mounting structure of the trailing arm according to the third invention for solving the above-mentioned problems is
A pair of left and right side sills provided on the outer side in the vehicle width direction of the rear side member;
The mounting member is
The outer panel has a brace extending in the longitudinal direction of the vehicle on the outer side in the vehicle width direction, joined to the outer surface in the vehicle width direction of the outer panel, and having a rear portion bent toward the side sill.
While supporting the front end of the brace to the cross member, characterized in that it supports the outer end of the brace to the side sill.

The mounting structure of the trailing arm according to the fourth invention for solving the above-mentioned problems is
The mounting member is
It has a bulkhead provided on the outer side in the vehicle width direction of the brace and extending in the vehicle width direction,
The inner end of the bulkhead is supported by the brace, and the outer end of the bulkhead is supported by the side sill.

A mounting structure of a trailing arm according to a fifth invention for solving the above-mentioned problems is
A pair of left and right front side members provided on the vehicle body front side of the cross member and provided inward of the rear side member in the vehicle width direction and extending in the vehicle longitudinal direction;
A connecting member for connecting the inner panel and the front side member is provided.

  Therefore, according to the mounting structure of the trailing arm according to the present invention, the mounting member for supporting the leading end portion of the trailing arm is supported by the cross member and the bracket for fixing the battery pack to the side member. Thus, the mounting rigidity of the trailing arm to the vehicle body can be improved.

It is the perspective view which looked at the vehicle body provided with the attachment structure of the trailing arm concerning one example of the present invention from the bottom. It is the enlarged view of the A section shown in FIG. 1, and is the perspective view which looked at the attachment structure of the trailing arm which concerns on one Example of this invention from the downward direction. It is the perspective view which looked at the attachment structure of the trailing arm shown in FIG. 2 from the vehicle body inner side. It is a bottom view of a vehicle body provided with the attachment structure of the trailing arm concerning one example of the present invention. It is a principal part enlarged view of FIG. It is a BB arrow sectional drawing of FIG. It is the perspective view which looked at the attachment member from the vehicle body rear side.

  Hereinafter, the attachment structure of the trailing arm according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the vehicle body 1 is, for example, a vehicle body applied to an electric vehicle traveling by a driving force of a motor, and a battery pack 13 is mounted under the vehicle body 1. In the battery pack 13, a large number of drive batteries (cells) for supplying the stored power to the motor are accommodated. A pair of left and right front wheels 11 is rotatably supported on the vehicle body front side of the battery pack 13, and a pair of left and right rear wheels 12 is rotatably supported on the vehicle body rear side of the battery pack 13. .

  Further, as shown in FIGS. 4 to 6, at the rear of the vehicle body 1, a rear floor panel 14 is provided which forms the bottom (floor surface) of the room (cabin or luggage compartment) 21. The rear portion of the battery pack 13 is disposed below the.

  Further, on both sides in the vehicle width direction of the vehicle body 1, a pair of left and right side sills 15 are provided. The side sills 15 extend in the longitudinal direction of the vehicle body, and a pair of left and right rear floor side members (rear side members) 16 are provided on the inner side in the vehicle width direction of the rear end portions of the side sills. These rear floor side members 16 are also extended in the vehicle longitudinal direction.

  The side sill 15 is joined to both sides of the rear floor panel 14 in the vehicle width direction, and the end of the rear seat cross member (cross member) 17 is joined to the inner side in the vehicle width direction at the rear end of the side sill 15 . The rear seat cross member 17 extends in the vehicle width direction and is joined to the lower surface of the rear floor panel 14. Furthermore, the rear floor side member 16 is joined to the lower surface of the rear floor panel 14, and the front end thereof is joined to the end of the rear seat cross member 17 and the inner surface in the vehicle width direction at the rear end of the side sill 15. .

  Between the pair of left and right rear floor side members 16, cross members 18 and 19 extending in the vehicle width direction are provided. That is, the rear seat cross member 17 and the cross members 18 and 19 connect the front ends, the intermediate portions, and the rear ends of the rear floor side members 16 respectively, and together with the rear floor side members 16, the rear frame of the vehicle body 1 Form.

  A pair of left and right front floor side members (front side members) 20 is provided on the vehicle front side of the rear seat cross member 17. The front floor side members 20 extend in the longitudinal direction of the vehicle body, and their rear end portions are joined to the lower portion of the rear seat cross member 17. That is, the front floor side member 20 and the rear floor side member 16 are arranged offset in the vehicle width direction, and the rear end of the front floor side member 20 and the front end of the rear floor side member 16 are the rear seat cross member It is linked through 17.

  Further, the battery pack 13 is provided inside the front floor side member 20 in the vehicle width direction. That is, the front floor side member 20 is disposed on the front side of the rear floor side member 16 on the vehicle body side and outside the battery pack 13 in the vehicle width direction, and along the vehicle width direction both sides of the battery pack 13 It is extended in the longitudinal direction of the vehicle body.

  As shown in FIGS. 2 to 6, the battery pack 13 is supported by the front floor side member 20 via the bracket 30 and supported by the rear floor side member 16 via the brackets 30 and 40. There is.

  A plurality of brackets 30 are provided on both sides in the vehicle width direction of the battery pack 13 with a predetermined interval in the longitudinal direction of the vehicle body. In the present embodiment, the bracket 30 located on the rearmost side of the vehicle body is fixed to the rear floor side member 16 via the bracket 40, and the other brackets 30 are directly fixed to the front floor side member 20. .

  Specifically, the bracket 30 is configured of a bracket body 31, a bottom plate 32, and a reinforcing member 33. The bracket main body 31 is formed substantially in a hat shape, and opens downward. The vehicle width direction inner end of the bracket body 31 is joined to the side portion of the battery pack 13, and a bolt hole through which the bolt 51 is inserted is formed in the upper portion of the bracket body 31. The bottom plate 32 also forms the bottom of the bracket body 31. Furthermore, the reinforcing member 33 is formed in a U-shape that is open toward the outer side in the vehicle width direction, and is interposed in the bracket main body 31.

  On the other hand, the bracket 40 is disposed on the rear side of the vehicle relative to the rear seat cross member 17 and is fixed to the rear floor side member 16 and is composed of a bracket body 41 and reinforcing members 42 and 43.

  The bracket main body 41 is formed in a U-shape opening upward, and is joined to the inner surface of the rear floor side member 16 in the vehicle width direction. A fastening portion 52 for fastening the bolt 51 is provided at the bottom of the bracket main body 41.

  The reinforcing members 42 and 43 are interposed in the bracket main body 41. Among them, the reinforcing member 42 is formed in a U-shape opened upward, and is superimposed on the bottom of the bracket main body 41. On the other hand, the reinforcing member 43 is formed in an L shape, and is provided to close the bracket main body 41 from above.

  That is, the battery pack 13 is fixed to the front floor side member 20 via the bracket 30 on the vehicle front side with respect to the rear seat cross member 17 and the brackets 30 and 40 on the vehicle rear side with respect to the rear seat cross member 17. , And is fixed to the rear floor side member 16.

  And when fixing the battery pack 13 to the front floor side member 20, the upper part of the bracket main body 31 in the bracket 30 and the lower part of the front floor side member 20 are connected with a volt | bolt. When the battery pack 13 is fixed to the rear floor side member 16, the upper portion of the bracket body 31 in the bracket 30 and the bottom portion of the bracket body 41 in the bracket 40 are connected using the bolt 51 and the fastening portion 52.

  Here, as shown in FIGS. 4 and 5, a trailing arm type rear suspension device is mounted on the vehicle body 1, and this rear suspension device is connected to the rear floor side member 16 in a pair of left and right A trailing arm 60 is provided.

  The trailing arm 60 extends in the longitudinal direction of the vehicle body directly below the rear floor side member 16 and has a proximal end 62 connected to the rear wheel 12 and a distal end 61 connected to the rear floor via the mounting member 70. It is connected to the tip of the side member 16. The mounting member 70 is joined to the lower surface of the tip end portion of the rear floor side member 16 and rotatably supports the tip portion 61 of the trailing arm 60 in the vehicle body vertical direction via a bush.

  Next, the configuration of the mounting member 70 for supporting the leading end 61 of the trailing arm 60 will be described in detail.

  As shown in FIG. 2 to FIG. 5 and FIG. 7, the mounting member 70 is composed of an inner panel 71, an outer panel 72, a brace 73, a bulkhead 74, a connecting plate 75, and a fixed shaft 76. The panel 71, the outer panel 72, the brace 73, the bulkhead 74, and the connecting plate 75 are arranged to overlap in the vehicle width direction.

  The inner panel 71 and the outer panel 72 constitute the main body of the mounting member 70, and sandwich the tip end portion 61 of the trailing arm 60, on the inner side in the vehicle width direction of the tip end portion 61 and the outer side in the vehicle width direction. It is arranged.

  In detail, the inner panel 71 is a plate-like member extending in the longitudinal direction of the vehicle body, and is disposed on the inner side in the vehicle width direction of the mounting member 70. The outer surface of the upper end portion of the inner panel 71 in the vehicle width direction is joined to the inner surface of the rear floor side member 16 in the vehicle width direction. Further, the front end 71 a of the inner panel 71 is joined to the lower portion of the rear seat cross member 17, and the rear end 71 b of the inner panel 71 is joined to the front of the bracket body 41 of the bracket 40.

  That is, the inner panel 71 is supported between the rear seat cross member 17 and the bracket 40 in the longitudinal direction of the vehicle body. Thus, by supporting the inner panel 71, the strength of the inner panel 71 in the vehicle longitudinal direction and the vehicle width direction is improved.

  On the other hand, the outer panel 72 is a plate-like member smaller than the inner panel 71, and is disposed on the outer side in the vehicle width direction of the inner panel 71. The upper end 72 a and the front end 72 b of the outer panel 72 are joined to the outer surface of the inner panel 71 in the vehicle width direction by being formed to be bent toward the inner panel 71.

  Further, on the outer side in the vehicle width direction of the outer panel 72, a brace 73 and a bulkhead 74 for reinforcing the outer panel 72 are disposed.

  The brace 73 is an L-shaped plate-like member that extends in the longitudinal direction of the vehicle body and has a rear side portion bent toward the vehicle width direction outer side (side sill 15). Is joined to the outer surface of the outer panel 72 in the vehicle width direction. The upper end 73a of the brace 73 is joined to the lower portion of the rear floor side member 16, the front end 73b of the brace 73 is joined to the lower portion of the rear seat cross member 17, and the outer end 73c of the brace 73 is of the side sill 15. It is joined to the inner part.

  Furthermore, the bulkhead 74 is a plate-like member extending in the vehicle width direction on the outer side in the vehicle width direction of the brace 73, and from the rear side portion including the upper end portion 73 a and the outer end portion 73 c in the brace 73 Also, it is disposed on the front side of the vehicle body. In the bulkhead 74, the inner end 74a is joined to the outer surface in the vehicle width direction of the brace 73, and the outer end 74b located on the outer side in the vehicle width direction than the inner end 74a is the side sill 15. It is joined to the inner surface in the vehicle width direction.

  Thus, by supporting the outer panel 72 on the side sill 15, the rear floor side member 16 and the rear seat cross member 17 by the brace 73 and the bulkhead 74, the vehicle longitudinal direction, the vehicle width direction, and the vehicle body in the outer panel 72 The strength in the vertical direction is improved.

  Furthermore, a connecting member 75 is provided on the inner side in the vehicle width direction of the inner panel 71. The connecting member 75 is extended so as to be gradually inclined outward in the vehicle width direction as it goes to the rear of the vehicle body, and connects the inner panel 71 and the front floor side member 20. The front end portion 75a of the connecting member 75 located at the innermost side in the vehicle width direction is joined to the outer surface of the front floor side member 20 in the vehicle width direction. 75 b is joined to the inner surface of the inner panel 71 in the vehicle width direction.

  As described above, by supporting the inner panel 71 on the front floor side member 20 with the connecting member 75, the strength in the vehicle width direction of the inner panel 71 is improved.

  The tip end portion 61 of the trailing arm 60 is supported rotatably relative to the fixed shaft 76 in the vertical direction of the vehicle body, and the fixed shaft 76 corresponds to the inner panel 71, the outer panel 72, and the brace 73. It is fixed to them by being inserted from the vehicle width direction.

  As described above, in the mounting structure of the trailing arm 60 according to the present invention, the front end portion 71a of the inner panel 71 in the mounting member 70 is supported by the rear seat cross member 17, while the rear end portion of the inner panel 71 in the mounting member 70. By supporting the bracket 71b with the bracket 40, the inner panel 71 can be supported by the rear seat cross member 17 and the bracket 40 so as to be sandwiched from both sides in the vehicle longitudinal direction. As a result, the strength of the inner panel 71 in the vehicle longitudinal direction and the vehicle width direction can be improved, so that the rigidity of the attachment member 70 having the inner panel 71 as a component can be improved. Therefore, since the deformation of the attachment member 70 can be suppressed, the attachment rigidity of the trailing arm 60 in the vehicle longitudinal direction and the vehicle width direction can be improved.

  In the brace 73, the upper end 73a is supported by the rear floor side member 16, the front end 73b is supported by the rear seat cross member 17, and the outer end 73c is supported by the side sill 15. The installation rigidity in the front-rear direction, the vehicle width direction, and the vehicle body vertical direction can be further improved.

  Furthermore, in the bulkhead 74, the mounting rigidity in the vehicle width direction of the trailing arm 60 can be further improved by supporting the inner end 74a on the brace 73 and supporting the outer end 74b on the side sill 15. .

  Furthermore, in the connecting member 75, the mounting rigidity of the trailing arm 60 in the vehicle width direction is further enhanced by supporting the front end 75a on the front floor side member 20 and supporting the rear end 75b on the inner panel 71. It can be improved.

  As mentioned above, although the attachment structure of the trailing arm concerning one example of the present invention was explained, about the attachment structure of the trailing arm concerning the present invention, of course, it is not limited to the embodiment mentioned above.

  In the mounting structure of the trailing arm according to the present invention, since the trailing arm can be firmly supported, it can be extremely usefully used to improve the steering stability of the vehicle.

REFERENCE SIGNS LIST 1 vehicle body 12 rear wheel 13 battery pack 14 rear floor panel 15 side sill 16 rear floor side member (rear side member according to the present invention)
17 Rear seat cross member (cross member according to the present invention)
18, 19 Cross member 20 Front floor side member (front side member according to the present invention)
Reference Signs List 30 bracket 31 bracket main body 32 bottom plate 33 reinforcing member 40 bracket (bracket according to the present invention)
DESCRIPTION OF SYMBOLS 41 Bracket main body 42, 43 Reinforcement member 60 Trailing arm 61 Tip part 62 Base end part 70 Mounting member 71 Inner panel 72 Outer panel 73 Brace 74 Bulk head 75 Connection plate 76 Fixing shaft

Claims (5)

A tray supporting a battery pack for storing a drive battery between a pair of left and right rear side members extending in the longitudinal direction of the vehicle at a rear portion of the vehicle body and connecting a trailing arm of a rear suspension device to the rear side member Ring arm mounting structure,
An attachment member provided on the rear side member and rotatably supporting a leading end of the trailing arm in the vertical direction of the vehicle body;
A cross member extending in the vehicle width direction on the vehicle body front side of the mounting member and joined to the rear side member;
Provided on the vehicle body rear side of the mounting member, and a bracket for fixing the battery pack to the rear side member,
A trailing arm mounting structure comprising: supporting a front end portion of the mounting member on the cross member, and supporting a rear end portion of the mounting member on the bracket. In the mounting structure of the trailing arm according to claim 1,
The mounting member is
An inner panel joined to the inner surface of the rear side member in the vehicle width direction and extending in the longitudinal direction of the vehicle body;
And an outer panel provided on the outer side in the vehicle width direction of the inner panel and supporting the leading end of the trailing arm with the inner panel.
A trailing arm mounting structure characterized in that a front end portion of the inner panel is supported by the cross member, and a rear end portion of the inner panel is supported by the bracket. In the mounting structure of the trailing arm according to claim 2,
A pair of left and right side sills provided on the outer side in the vehicle width direction of the rear side member;
The mounting member is
The outer panel has a brace extending in the longitudinal direction of the vehicle on the outer side in the vehicle width direction, joined to the outer surface in the vehicle width direction of the outer panel, and having a rear portion bent toward the side sill.
A trailing arm mounting structure characterized in that a front end of the brace is supported by the cross member, and an outer end of the brace is supported by the side sill. In the mounting structure of the trailing arm according to claim 3,
The mounting member is
It has a bulkhead provided on the outer side in the vehicle width direction of the brace and extending in the vehicle width direction,
A trailing arm attachment structure comprising: supporting an inner end of the bulkhead to the brace, and supporting an outer end of the bulkhead to the side sill. About the attachment structure of the trailing arm according to any one of claims 2 to 4,
A pair of left and right front side members provided on the vehicle body front side of the cross member and provided inward of the rear side member in the vehicle width direction and extending in the vehicle longitudinal direction;
A mounting structure for a trailing arm, comprising a connecting member for connecting the inner panel and the front side member.

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