JP2021008250A - Vehicle rear trailing arm support structure - Google Patents

Abstract

To support a load acting a rear trailing arm even if a side sill or another component is not disposed near the rear trailing arm.SOLUTION: A vehicle rear trailing arm support structure includes: a side sill inner 11; a rear side frame 2 coupled to a rear part of the side sill inner; and a reinforcement member which is fixed to the side sill inner to reinforce the component. The rear side frame has: a bottom wall 2A; and an outer wall 2B and an inner wall 2C extending upward from both ends as seen in a vehicle width direction of the bottom wall. The inner wall is fixed to the side sill inner. The vehicle rear trailing arm support structure further includes: an outer support wall 7 fixed to the outer wall and hanging to a lower side of the outer wall; an inner support wall 8 fixed to the inner wall and hanging to a lower side of the inner wall; and a bolt 41 rotatably supporting the rear trailing arm 4 between the outer support wall and the inner support wall. The outer support wall includes an extension part 71 extending to the front of the vehicle and coupled to the reinforcement member.SELECTED DRAWING: Figure 5

Description

The present invention relates to a vehicle rear trailing arm support structure.

In Patent Document 1, a vehicle in which a rear trailing arm is rotatably supported by a bolt between a support bracket fixed to an outer surface of a rear side frame and an inner surface of a rear end portion of a side sill facing the support bracket. Rear trailing arm support structure for use is disclosed. The support bracket is arranged so that the rear side frame is located between the support bracket and the cross member. Therefore, in the configuration of Patent Document 1, the load in the left-right direction (vehicle width direction) and the front-rear direction of the vehicle acting on the rear trailing arm while the vehicle is running is supported by the rear end portion of the side sill and the cross member.

JP-A-2018-203055

By the way, if the mounting position of the rear trailing arm with respect to the frame of the vehicle is changed, the rear end portion of the side sill or the cross member may not be used to support the load acting on the rear trailing arm. For example, if the mounting position of the rear trailing arm is changed to the position behind the vehicle from the rear end of the side sill or the cross member (for example, the position directly below the rear side frame), the rear end of the side sill or the cross member becomes the rear trailing arm. It cannot be used to support the acting load.

The present invention has been made in view of the above circumstances, and is a rear trailing for a vehicle capable of supporting a load acting on the rear trailing arm in the left-right direction and the front-rear direction even if the side sill and the cross member are not arranged near the rear trailing arm. It is an object of the present invention to provide an arm support structure.

(1) In order to achieve the above object, the vehicle rear trailing arm support structure according to one aspect of the present invention is inclined downward and outward at the front with a side sill inner (for example, the side sill inner 11 in the embodiment). A rear side frame (for example, the rear side frame 2 in the embodiment) having an inclined portion (for example, the inclined portion 21 in the embodiment) coupled to the rear portion of the side sill inner, and a reinforcing member fixed to the side sill inner to reinforce the side sill inner. (For example, the reinforcing member 3 in the embodiment), and the rear side frame includes a bottom wall (for example, the bottom wall 2A in the embodiment), and an outer wall and an inner side wall of the bottom wall extending upward from both ends in the vehicle width direction. (For example, the outer wall surface 2B and the inner side wall 2C in the embodiment) are formed in a U-shaped cross section that opens upward, and the inner side wall is fixed to the side sill inner and is fixed on the outer wall. An outer support wall (for example, the outer support wall 7 in the embodiment) that hangs down below the outer wall surface, and an inner support wall that hangs down below the inner side wall and faces the outer support wall. (For example, the inner support wall 8 in the embodiment) and a bolt (for example, in the embodiment) that rotatably supports the rear trailing arm (for example, the rear trailing arm 4 in the embodiment) between the outer support wall and the inner support wall. The outer support wall further comprises a bolt 41) and includes an extension (eg, an extension 71 in the embodiment) that extends forward of the vehicle from a portion fixed to the outer wall and is coupled to the reinforcing member.

(2) In one aspect of the present invention, the side sill inner extends outward from both ends of the inner side wall portion (for example, the inner side wall portion 11A in the embodiment) and the inner side wall portion in the vertical direction of the vehicle in the vehicle width direction. It has an upper wall and a lower wall (for example, the upper wall 11B and the lower wall 11C in the embodiment) and is formed in a U-shaped cross section that opens outward in the vehicle width direction, and the reinforcing member is the upper wall and the lower wall. It may be a jack-up stiffener coupled to the wall (for example, the jack-up stiffener 3 in the embodiment).

(3) In one aspect of the present invention, the jack-up stiffener may be coupled to a closing plate (eg, closing plate 5 in the embodiment) that closes the opening of the rear side frame.

(4) In one aspect of the present invention, the side sill inner extends from both ends of the inner side wall portion (for example, the inner side wall portion 11A in the embodiment) and the inner side wall portion in the vertical direction of the vehicle to the outside in the vehicle width direction. It has an upper wall and a lower wall (for example, the upper wall 11B and the lower wall 11C in the embodiment) and is formed in a U shape having a U-shaped cross section that opens outward in the vehicle width direction, and the side sill inner is formed on the rear portion of the lower wall. A reinforcing portion (for example, a reinforcing portion 13 in the embodiment) that is configured and fixed on the outer support wall to reinforce the outer support wall, and a rear portion of the side sill inner and the inner side wall portion are provided in the vehicle width direction. A holding portion (for example, a holding portion 14 in the embodiment) that expands to hold the front end of the rear side frame may be further provided, and the inner side wall portion in the holding portion may be coupled to the inner support wall. ..

(5) In one aspect of the present invention, the outer support wall has a bolt insertion hole through which the bolt passes (for example, the bolt insertion hole 72 in the embodiment), and the inner support wall has a nut for fastening the bolt. (For example, the nut 81 in the embodiment) is provided, and the upper end portion of the inner support wall is coupled to the inner side wall portion of the holding portion, and is vertically fixed to the inner support wall, and a bolt insertion hole through which the bolt passes. For example, a reinforcing plate having a bolt insertion hole 84 in the embodiment (for example, the reinforcing plate 83 in the embodiment) may be coupled to the lower wall in the holding portion.

(6) In one aspect of the present invention, the outer support wall is formed with a reinforcing flange (for example, the reinforcing flange 73 in the embodiment) in which the lower end of the outer support wall is folded outward in the vehicle width direction. May be overlapped and coupled to the reinforcing portion.

(7) In one aspect of the present invention, a coupling reinforcing member (for example, a coupling reinforcing member 9 in the embodiment) to be coupled to the reinforcing portion, the lower wall in the holding portion, and the inner support wall may be further provided. ..

(8) In one aspect of the present invention, the outer support wall may form a rear wheel house inner.

(9) In one aspect of the present invention, the reinforcing member may be coupled to a rear wheel house outer (for example, the rear wheel house outer 6 in the embodiment).

(10) In one aspect of the present invention, the extension portion may be bent so as to be separated from the main body portion (for example, 31 in the embodiment) of the reinforcing member.

According to the aspect (1) above, the bolts that support the rear trailing arm are attached to the outer support wall and the inner support wall that hang downward from the rear side frame. This allows the rear trailing arm to be rotatably supported beneath the rear side frame without the rear trailing arm being placed near the side sill or cross member.
Further, according to the aspect (1) above, the extension portion of the outer support wall is coupled to the reinforcing member for the side silner. As a result, the load in the vehicle width direction (left-right direction of the vehicle) and the front-rear direction acting on the rear trailing arm while the vehicle is running can be transmitted from the extension portion of the outer support wall to the reinforcing member for the side silner.
Further, according to the aspect (1) above, the inner support wall is fixed to the side silin inner. As a result, the load acting on the rear trailing arm in the vehicle width direction and the front-rear direction while the vehicle is traveling can be transmitted from the inner support wall to the side silner.
From the above, even if the side sill and the cross member are not arranged near the rear trailing arm, it is possible to support the load acting on the rear trailing arm in the vehicle width direction and the front-rear direction.

According to the aspect (2) above, the load acting on the rear trailing arm in the front-rear direction can be distributed vertically from the jack-up stiffener and transmitted to the side sill innerr. That is, the load acting on the rear trailing arm in the vehicle width direction and the front-rear direction can be supported by the side sill innerr.

According to the aspect (3) above, the load acting on the rear trailing arm in the front-rear direction can be transmitted from the jack-up stiffener to the closing plate that closes the opening of the rear side frame.

According to the aspect (4) above, the load acting on the outer support wall in the front-rear direction can be transmitted from the reinforcing portion to the lower wall of the side siliner located in front of the reinforcing portion. Further, the load acting on the inner support wall can be transmitted from the holding portion to the inner side wall portion of the side silin inner located in front of the holding portion.

According to the aspect (5) above, the load acting on the inner support wall in the front-rear direction can be transmitted from the holding portion to the lower wall and the inner side wall portion of the side silina located in front of the holding portion. Further, since the bolts can be sequentially inserted into the bolt insertion holes of the outer support wall and the reinforcing plate from the outside in the vehicle width direction and fastened to the nuts of the inner support wall, the workability of attaching the bolts is improved.

According to the aspect (6) above, the load acting on the outer support wall in the front-rear direction can be transmitted from the reinforcing portion to the lower wall of the side silina located in front of the reinforcing portion via the reinforcing flange.

According to the aspect (7) above, the outer support wall and the inner support wall are firmly bonded to the side silin inner including the reinforcing portion and the holding portion by the coupling reinforcing member. As a result, the load in the vehicle width direction and the front-rear direction can be distributed and transmitted to the entire side silly inner.

According to the aspect (8) above, since the outer support wall also serves as the rear wheel house inner, the number of parts constituting the rear wheel house inner can be reduced. Therefore, it is possible to suppress the intrusion of muddy water and the like into the vehicle body.

According to the aspect (9) above, the load acting on the reinforcing member can be distributed from the rear wheel house outer to the upper vehicle body.

According to the aspect (10) above, the extension portion of the outer support wall and the reinforcing member can be sandwiched and joined by spot welding, so that the productivity of the vehicle can be improved.

It is a side view which looked at the rear trailing arm support structure for a vehicle of one Embodiment of this invention from the outside in the vehicle width direction. FIG. 5 is a side view schematically showing a side sill inner and a rear side frame constituting the rear trailing arm support structure for a vehicle of FIG. 1. It is a perspective view which shows the rear trailing arm support structure for a vehicle seen from the direction III of FIG. It is the figure which broke at the line IV-IV of FIG. It is the figure which was broken by the VV line of FIGS. 1 and 4. It is the figure which was broken by the VI-VI line of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
As shown in FIG. 3, the vehicle rear trailing arm support structure according to the present embodiment rotatably supports the rear trailing arm 4 directly under the rear side frame 2. As shown in FIGS. 1 and 3, the vehicle rear trailing arm support structure includes a side sill 1 and a rear side frame 2 constituting a vehicle frame, and a reinforcing member 3 for reinforcing the side sill 1. A pair of rear trailing arm support structures for vehicles including a rear trailing arm 4, a side sill 1, a rear side frame 2, etc. are provided at both ends in the left-right direction (vehicle width direction) of the vehicle, but in FIGS. 1 to 6, they are provided on the left side of the vehicle. Only the structures to be arranged are described.

As shown in FIGS. 2 and 6, the side sill 1 extends in the front-rear direction of the vehicle. As shown in FIG. 6, the side sill 1 has a side sill inner 11 and a side sill outer 12 arranged outside the side sill inner 11 in the vehicle width direction. The side sill inner 11 and the side sill outer 12 are formed into a hollow tubular shape by being joined to each other by welding or the like. In FIGS. 1 to 5, the description of the side sill outer 12 is omitted.

As shown in FIGS. 5 and 6, the side sill inner 11 is formed in a U-shaped cross section that opens outward in the vehicle width direction. The side sill inner 11 has an inner side wall portion 11A, and an upper wall 11B and a lower wall 11C extending outward in the vehicle width direction from both ends of the inner side wall portion 11A in the vertical direction of the vehicle. The inner side wall portion 11A is formed in a plate shape with the vehicle width direction as the plate thickness direction. The upper wall 11B and the lower wall 11C are each formed in a plate shape with the vertical direction as the plate thickness direction.

As shown in FIGS. 1 to 4, the side sill inner 11 has a reinforcing portion 13 and a holding portion 14 constituting a rear portion.
As shown in FIGS. 3 and 6, the reinforcing portion 13 mainly constitutes the lower wall 11C of the side silin inner 11 at the rear portion. The reinforcing portion 13 is formed separately from the main body portion of the side sill inner 11 located in front of the reinforcing portion 13, and is connected to the main body portion by welding or the like. The reinforcing portion 13 is stacked and fixed on the outer support wall 7 described later to reinforce the outer support wall 7.
As shown in FIGS. 2 and 4, the holding portion 14 is inclined upward with respect to the main body portion of the side silly inner 11 and inward in the vehicle width direction. As a result, the inner side wall portion 11A of the holding portion 14 is formed so as to expand inward in the vehicle width direction. The holding portion 14 is integrally formed with the main body portion of the side sill inner 11. The holding portion 14 holds the front end of the rear side frame 2, which will be described later.

As shown in FIG. 2, the rear side frame 2 extends in the front-rear direction inside the side sill 1 in the vehicle width direction. The rear side frame 2 has an inclined portion 21 that is inclined downward and outward at the front portion thereof and is joined to the above-mentioned side sill inner 11 (particularly the above-mentioned holding portion 14) by welding or the like.

As shown in FIG. 5, the rear side frame 2 (particularly the inclined portion 21) is formed in a U-shaped cross section that opens upward. The rear side frame 2 (particularly the inclined portion 21) has a bottom wall 2A, and an outer wall 2B and an inner side wall 2C of the bottom wall 2A extending upward from both ends in the vehicle width direction. The bottom wall 2A is formed in a plate shape extending in the vehicle width direction and the front-rear direction with the vertical direction being the plate thickness direction. The outer side wall 2B and the inner side wall 2C are each formed in a plate shape with the vehicle width direction as the plate thickness direction. The bottom wall 2A, the outer wall 2B, and the inner side wall 2C are integrally formed.

The front end of the rear side frame 2 which is the inclined portion 21 is fixed to the rear portion of the side sil inner 11 described above. Specifically, the inner side wall 2C of the rear side frame 2 is overlapped with respect to the inner side wall portion 11A of the side silner 11 in the holding portion 14 on the outer side in the vehicle width direction, and is joined by welding or the like. Further, at the front end of the rear side frame 2, the lower wall 11C of the side silina 11 in the holding portion 14 is located below the bottom wall 2A of the rear side frame 2.

As shown in FIGS. 1 and 6, the reinforcing member 3 is fixed to the rear portion of the side sill inner 11 to reinforce the side sill inner 11. In the present embodiment, the reinforcing member 3 is arranged outside the side sill inner 11 in the vehicle width direction, and is connected to the upper wall 11B and the lower wall 11C of the side sill inner 11 by welding or the like. In the present embodiment, the lower wall 11C of the side silin inner 11 coupled to the reinforcing member 3 is the reinforcing portion 13.

The reinforcing member 3 is formed in a plate shape extending in the vertical direction and the front-rear direction with the vehicle width direction as the plate thickness direction. Specifically, as shown in FIGS. 1, 3 and 4, the reinforcing member 3 of the present embodiment has a vehicle width direction as a plate thickness direction, extends in the vertical direction and the front-rear direction, and is coupled to the side silin inner 11. It has 31 and a bent portion 32 that is bent at the rear portion of the main body portion 31 and extends outward in the vehicle width direction so as to be separated from the side sill inner 11.
The reinforcing member 3 of the present embodiment is a jack-up stiffener. In the following description, the reinforcing member 3 may be referred to as a jack-up stiffener 3.

As shown in FIGS. 5 and 6, the reinforcing member 3 (jack-up stiffener 3) is joined to a closing plate 5 that closes at least a part of the opening of the rear side frame 2 (particularly the inclined portion 21) by welding or the like. The closing plate 5 may be, for example, a part of a floor panel (not shown). As shown in FIG. 5, the closing plate 5 may be joined to the outer support wall 7 described later by welding or the like.
Further, as shown in FIG. 1, the reinforcing member 3 is joined to the rear wheel house outer 6 constituting the rear wheel house by welding or the like. Specifically, the bent portion 32 of the reinforcing member 3 is coupled to the rear wheel house outer 6.

As shown in FIGS. 3 to 5, the rear trailing arm support structure for a vehicle further includes an outer support wall 7, an inner support wall 8, and a bolt 41.

The outer support wall 7 is overlapped with the outer wall 2B of the rear side frame 2 (particularly the inclined portion 21) and fixed by welding or the like. The outer support wall 7 hangs below the outer wall 2B and projects below the bottom wall 2A of the rear side frame 2 (particularly the inclined portion 21) and the lower wall 11C of the side silina 11 in the holding portion 14. Like the outer wall 2B, the outer support wall 7 is formed in a plate shape mainly in the vehicle width direction as the plate thickness direction.
The outer support wall 7 includes an extension portion 71 that extends forward from a fixed portion with the outer wall 2B fixed to the outer wall 2B and is joined to the reinforcing member 3 described above by welding or the like.

As shown in FIG. 4, the extension portion 71 of the present embodiment bends with respect to the fixed portion with the outer wall 2B so as to be separated from the main body portion 31 of the reinforcing member 3 coupled to the side silin inner 11. Specifically, the extension portion 71 extends outward in the vehicle width direction so as to be separated from the main body portion 31 of the reinforcing member 3. Then, the extension portion 71 is overlapped and fixed on the bent portion 32 of the reinforcing member 3 extending outward in the vehicle width direction.
The extension portion 71 of the outer support wall 7 is bent so as not to be folded back at an acute angle with respect to the fixed portion of the outer support wall 7, that is, at an obtuse angle (90 degrees or more) with respect to the fixed portion of the outer support wall 7. It is tilted. Similarly, the bent portion 32 of the reinforcing member 3 is bent so as not to be folded back at an acute angle with respect to the main body portion 31 of the reinforcing member 3, that is, an obtuse angle (90 degrees or more) with respect to the main body portion 31 of the reinforcing member 3. ) Is inclined.

As shown in FIGS. 4 and 5, the reinforcing portion 13 of the side silin inner 11 described above is overlapped and fixed to the outer support wall 7. In the present embodiment, the reinforcing portion 13 overlaps the surface of the outer support wall 7 facing the inner support wall 8. As a result, the outer support wall 7 is reinforced.
The outer support wall 7 has a bolt insertion hole 72 through which the bolt 41 passes. The bolt insertion hole 72 is located below the outer wall 2B. In the present embodiment, the reinforcing portion 13 described above also has a bolt insertion hole 15 through which the bolt 41 passes, and the outer support wall 7 and the bolt insertion holes 72 and 15 of the reinforcing portion 13 overlap each other.
As shown in FIGS. 3 to 5, the outer support wall 7 is formed with a reinforcing flange 73 in which the lower end of the outer support wall 7 is folded outward in the vehicle width direction. The reinforcing flange 73 is overlapped with the above-mentioned reinforcing portion 13 and is joined by welding or the like.

The outer support wall 7 of the present embodiment has an upper outer support wall 7A and a lower outer support wall 7B arranged in the vertical direction and connected to each other by welding or the like.
An upper outer support wall 7A located on the upper side is fixed to the outer wall 2B of the rear side frame 2. The bolt insertion hole 72 and the reinforcing flange 73 of the outer support wall 7 are formed in the lower outer support wall 7B located below the upper outer support wall 7A. The extension portion 71 of the outer support wall 7 may be composed of, for example, only one of the upper outer support wall 7A and the lower outer support wall 7B, but in the present embodiment, the upper outer support wall 7A and the lower outer support wall 7B It is composed of both.

The reinforcing portion 13 of the side sill inner 11 is fixed to both the upper outer support wall 7A and the lower outer support wall 7B. That is, the reinforcing portion 13 reinforces the connection between the upper outer support wall 7A and the lower outer support wall 7B.
The outer support wall 7 of the present embodiment configured as described above forms a rear wheel house inner that forms a part of the rear wheel house.

As shown in FIG. 5, the inner support wall 8 is overlapped with the inner side wall 2C of the rear side frame 2 (particularly the inclined portion 21) and fixed by welding or the like. The inner support wall 8 hangs below the inner side wall 2C and projects below the bottom wall 2A of the rear side frame 2 (particularly the inclined portion 21) and the lower wall 11C of the side silina 11 in the holding portion 14. As a result, the inner support wall 8 faces the outer support wall 7 in the vehicle width direction. Similar to the inner side wall 2C, the inner support wall 8 is formed in a plate shape mainly in the vehicle width direction as the plate thickness direction.

The inner support wall 8 is provided with a nut 81 for fastening the bolt 41 passed through the bolt insertion hole 72 of the outer support wall 7. The nut 81 may be provided, for example, on the facing surface 8a of the inner support wall 8 facing the outer support wall 7. In the present embodiment, the nut 81 is provided on the opposite surface 8b of the inner support wall 8 facing the opposite side of the facing surface 8a. Therefore, the inner support wall 8 has a bolt insertion hole 82 formed at a position corresponding to the nut 81 through which the bolt 41 passes. The nut 81 and the bolt insertion hole 82 of the inner support wall 8 are located below the inner side wall 2C.

A reinforcing plate 83 for reinforcing the inner support wall 8 is superposed on the inner support wall 8 and fixed by welding or the like. The reinforcing plate 83 may be overlapped and fixed on the opposite surface 8b of the inner support wall 8, for example. In the present embodiment, the reinforcing plate 83 is overlapped and fixed in a region of the facing surface 8a of the inner support wall 8 located below the bottom wall 2A and the lower wall 11C.
Further, the reinforcing plate 83 covers the nut 81 and the bolt insertion hole 82 of the inner support wall 8 in the vehicle width direction. Therefore, the reinforcing plate 83 has a bolt insertion hole 84 formed at a position corresponding to the nut 81 and the bolt insertion hole 82 of the inner support wall 8 and through which the bolt 41 passes. As shown in FIG. 3, the reinforcing plate 83 is joined to the lower wall 11C of the side silner 11 in the holding portion 14 by welding or the like.

As shown in FIG. 5, the inner support wall 8 is also coupled to the inner side wall portion 11A of the side silin inner 11 in the holding portion 14. Specifically, the upper end portion of the inner support wall 8 connected to the inner side wall 2C of the rear side frame 2 is also connected to the inner side wall portion 11A of the holding portion 14 by welding or the like. Further, the upper end portion of the inner support wall 8 is arranged so as to sandwich the inner side wall portion 11A of the holding portion 14 with the inner side wall 2C of the rear side frame 2.

As shown in FIGS. 3 to 5, the bolt 41 rotatably supports the rear trailing arm 4 between the outer support wall 7 and the inner support wall 8. In the present embodiment, the bolt 41 is passed through the bolt insertion holes 72, 15, 84, 82 of the outer support wall 7, the reinforcing portion 13, the reinforcing plate 83, and the inner support wall 8 in order, and then the inner support wall 8 is used. It meshes with the nut 81 provided in the above and is fastened. As a result, the bolt 41 and the rear trailing arm 4 supported by the bolt 41 are arranged directly below the rear side frame 2 (particularly the inclined portion 21). Specifically, the bolt 41 and the rear trailing arm 4 are arranged behind the cross member (not shown) and directly below the rear side frame 2.

As shown in FIGS. 3 and 5, the vehicle rear trailing arm support structure of the present embodiment further includes a coupling reinforcing member 9. The joint reinforcing member 9 is joined to the lower wall 11C and the inner support wall 8 of the reinforcing portion 13 and the holding portion 14 by welding or the like. As a result, the reinforcing portion 13, the outer support wall 7 fixed to the reinforcing portion 13, and the inner support wall 8 are firmly coupled to the lower wall 11C in the holding portion 14 by the coupling reinforcing member 9.

As described above, according to the vehicle rear trailing arm support structure of the present embodiment, the bolts 41 that support the rear trailing arm 4 are attached to the outer support wall 7 and the inner support wall 8 that hang downward from the rear side frame 2. It is attached. Therefore, even if the rear trailing arm 4 is not arranged near the side sill 1 or the cross member, the rear trailing arm 4 can be rotatably supported directly under the rear side frame 2.

Further, according to the vehicle rear trailing arm support structure of the present embodiment, the extension portion 71 of the outer support wall 7 is coupled to the reinforcing member 3 for the side silin inner 11. As a result, the load in the vehicle width direction and the front-rear direction (particularly the load in the front-rear direction) acting on the rear trailing arm 4 while the vehicle is running is transferred from the extension portion 71 of the outer support wall 7 to the reinforcing member 3 for the side silin inner 11. Can be communicated.
Further, the inner support wall 8 is fixed to the side sill inner 11. As a result, the load in the vehicle width direction and the front-rear direction acting on the rear trailing arm 4 while the vehicle is running can be transmitted from the inner support wall 8 to the side silina 11.
From the above, even if the side sill 1 and the cross member are not arranged near the rear trailing arm 4, the load acting on the rear trailing arm 4 in the vehicle width direction and the front-rear direction can be supported.

Further, in the vehicle rear trailing arm support structure of the present embodiment, the reinforcing member 3 is a jack-up stiffener 3 coupled to the upper wall 11B and the lower wall 11C of the side sil inner 11. As a result, the load acting on the rear trailing arm 4 in the front-rear direction can be distributed vertically from the jack-up stiffener 3 and transmitted to the side sill innerr 11. That is, the load acting on the rear trailing arm 4 in the vehicle width direction and the front-rear direction can be supported by the side silin inner 11.

Further, according to the vehicle rear trailing arm support structure of the present embodiment, the jack-up stiffener 3 is coupled to the closing plate 5 that closes the upward opening of the rear side frame 2. As a result, the load acting on the rear trailing arm 4 in the front-rear direction can be transmitted from the jack-up stiffener 3 to the closing plate 5.

Further, in the vehicle rear trailing arm support structure of the present embodiment, the outer support wall 7 is fixed to the reinforcing portion 13 constituting the rear portion of the lower wall 11C of the side silina 11. As a result, the load acting on the outer support wall 7 in the front-rear direction can be transmitted from the reinforcing portion 13 to the lower wall 11C of the side silina 11 located in front of the reinforcing portion 13.

Further, in the vehicle rear trailing arm support structure of the present embodiment, the inner support wall 8 is coupled to the inner side wall portion 11A of the side silina 11 in the holding portion 14. As a result, the load acting on the inner support wall 8 (particularly the load in the front-rear direction) can be transmitted from the holding portion 14 to the inner side wall portion 11A of the side silin inner 11 located in front of the holding portion 14.

Further, according to the vehicle rear trailing arm support structure of the present embodiment, the reinforcing plate 83 fixed to the inner support wall 8 is connected to the lower wall 11C of the side silina 11 in the holding portion 14. As a result, the load acting on the inner support wall 8 in the front-rear direction can be transmitted from the holding portion 14 to the lower wall 11C of the side silina 11 located in front of the holding portion 14.

Further, according to the vehicle rear trailing arm support structure of the present embodiment, the outer support wall 7 and the reinforcing plate 83 have bolt insertion holes 72 and 82 through which the bolts 41 pass, respectively, and the inner support wall 8 has the bolts 41. A nut 81 for fastening is provided. Therefore, the bolts 41 can be sequentially inserted into the bolt insertion holes 72 and 82 of the outer support wall 7 and the reinforcing plate 83 from the outside in the vehicle width direction and fastened to the nut 81 of the inner support wall 8. Therefore, the workability of attaching the bolt 41 is improved.

Further, in the vehicle rear trailing arm support structure of the present embodiment, the reinforcing flange 73 formed at the lower end of the outer support wall 7 is overlapped with the reinforcing portion 13 constituting the rear portion of the lower wall 11C of the side silin inner 11. To. As a result, the load acting on the outer support wall 7 in the front-rear direction can be transmitted from the reinforcing portion 13 to the lower wall 11C of the side silin inner 11 located in front of the reinforcing portion 13 via the reinforcing flange 73.

Further, according to the vehicle rear trailing arm support structure of the present embodiment, the outer support wall 7 and the inner support wall 8 are firmly connected to the side silin inner 11 including the reinforcing portion 13 and the holding portion 14 by the coupling reinforcing member 9. To. As a result, the load in the vehicle width direction and the front-rear direction can be distributed and transmitted to the entire side silin inner 11.

Further, in the vehicle rear trailing arm support structure of the present embodiment, the outer support wall 7 also serves as the rear wheel house inner. As a result, the number of parts constituting the rear wheel house inner can be reduced. Therefore, it is possible to suppress the intrusion of muddy water and the like into the vehicle body.

Further, according to the vehicle rear trailing arm support structure of the present embodiment, the reinforcing member 3 (jack-up stiffener 3) is coupled to the rear wheel house outer 6. As a result, the load acting on the reinforcing member 3 can be distributed from the rear wheel house outer 6 to the upper vehicle body.

Further, in the vehicle rear trailing arm support structure of the present embodiment, the extension portion 71 of the outer support wall 7 is bent so as to be separated from the main body portion 31 of the reinforcing member 3. Specifically, the extension portion 71 of the outer support wall 7 is bent so as to incline at an obtuse angle with respect to the fixed portion of the outer support wall 7 with respect to the outer wall 2B without folding back. Further, the bent portion 32 of the reinforcing member 3 which is overlapped and fixed to the extension portion 71 is bent so as to be inclined at an obtuse angle with respect to the main body portion 31 of the reinforcing member 3. As a result, the extension portion 71 of the outer support wall 7 and the reinforcing member 3 can be sandwiched and joined by spot welding, so that the productivity of the vehicle can be improved.

Although the details of the present invention have been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 Side sill 2 Rear side frame 2A Bottom wall 2B Outer side wall 2C Inner side wall 3 Reinforcing member (jack-up stiffener)
4 Rear trailing arm 5 Closing plate 6 Rear wheel house Outer 7 Outer support wall 8 Inner support wall 9 Coupling reinforcement member 11 Side sill inner 11A Inner side wall 11B Upper wall 11C Lower wall 13 Reinforcing part 14 Holding part 15 Bolt insertion hole 21 Inclined part 31 Main body 32 Bending 41 Bolt 71 Extension 72 Bolt insertion hole 73 Reinforcing flange 81 Nut 82 Bolt insertion hole 83 Reinforcing plate 84 Bolt insertion hole

Claims (10)

It is provided with a side sill inner, a rear side frame having an inclined portion inclined downward and outward at the front portion and coupled to the rear portion of the side sill inner, and a reinforcing member fixed to the side sill inner to reinforce the side sill inner.
The rear side frame has a bottom wall, and an outer wall and an inner side wall extending upward from both ends in the vehicle width direction of the bottom wall, and is formed in a U-shaped cross section that opens upward.
The inner side wall is fixed to the side sill inner and
An outer support wall that is overlapped and fixed to the outer wall and hangs down below the outer wall, and an inner support wall that is overlapped and fixed to the inner side wall and hangs down below the inner side wall and faces the outer support wall. Further provided with bolts that rotatably support the rear trailing arm between the outer support wall and the inner support wall.
The outer support wall is a rear trailing arm support structure for a vehicle including an extension portion extending from a fixed portion with the outer wall to the front of the vehicle and being coupled to the reinforcing member. The side sill inner has a cross section U having an inner side wall portion and an upper wall and a lower wall of the inner side wall portion extending outward in the vehicle width direction from both ends in the vertical direction of the vehicle and opening to the outside in the vehicle width direction. Formed in a shape,
The vehicle rear trailing arm support structure according to claim 1, wherein the reinforcing member is a jack-up stiffener coupled to the upper wall and the lower wall. The vehicle rear trailing arm support structure according to claim 2, wherein the jack-up stiffener is coupled to a closing plate that closes the opening of the rear side frame. The side sill inner has a cross section U having an inner side wall portion and an upper wall and a lower wall of the inner side wall portion extending outward in the vehicle width direction from both ends in the vertical direction of the vehicle and opening to the outside in the vehicle width direction. Formed in a shape,
The side sill inner constitutes a rear portion of the lower wall and is vertically fixed to the outer support wall to reinforce the outer support wall, and a rear portion of the side sill inner and the inner side wall portion of the vehicle. It further has a holding portion that expands in the width direction and holds the front end of the rear side frame.
The vehicle rear trailing arm support structure according to any one of claims 1 to 3, wherein the inner side wall portion of the holding portion is coupled to the inner support wall. The outer support wall has a bolt insertion hole through which the bolt passes.
The inner support wall is provided with a nut for fastening the bolt.
The upper end of the inner support wall is coupled to the inner wall of the holding portion.
The rear trailing arm support structure for a vehicle according to claim 4, wherein a reinforcing plate which is vertically fixed to the inner support wall and has a bolt insertion hole through which the bolt passes is coupled to the lower wall in the holding portion. A reinforcing flange is formed on the outer support wall by folding the lower end of the outer support wall outward in the vehicle width direction.
The vehicle rear trailing arm support structure according to claim 4 or 5, wherein the reinforcing flange is overlapped and coupled to the reinforcing portion. The rear trailing arm support structure for a vehicle according to any one of claims 4 to 6, further comprising a coupling reinforcing member to be coupled to the reinforcing portion, the lower wall in the holding portion, and the inner support wall. The vehicle rear trailing arm support structure according to any one of claims 1 to 7, wherein the outer support wall forms a rear wheel house inner. The reinforcing member is a vehicle rear trailing arm support structure according to any one of claims 1 to 8, which is coupled to a rear wheel house outer. The vehicle rear trailing arm support structure according to any one of claims 1 to 9, wherein the extension portion bends away from the main body portion of the reinforcing member.

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