JP2020075603A - Vehicle body rear part structure - Google Patents

Abstract

To allow a pillar reinforcement to suppress a first inward-facing vertical wall of a pillar inner panel from falling down toward outside in a vehicle width direction, when opening a back door to prevent a corner part from deforming.SOLUTION: In a vehicle body rear part structure which has a rear pillar 3 having a closed cross section part D formed of a pillar outer panel 31, a pillar extension panel 32 and a pillar inner panel 33, where the extension panel 32 is provided with a stay storage part 30 of a back door stay 4 that supports a load when opening and closing the back door 1, and the back door stay 4 is stored in a stay storage part 30 along the rear pillar 3 with the door closed, the pillar inner panel 33 has a first inward-facing vertical wall 32A pointing to inside in a vehicle width direction and a first forward-facing vertical wall 33B extending from a front end part 33a of the first inward-facing vertical wall 32A to outside in the vehicle width direction. In the closed cross section D is provided a corner part 33C formed by the inward-facing vertical wall 33A and the forward-facing vertical wall 33B, and a pillar reinforcement 8 fixed to the vertical walls 33A and 33B is arranged across the corner part 33C.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle body rear structure.

  In some conventional vehicles, a flip-up type back door is provided at the rear part of the vehicle body so as to be openable and closable. Since such a back door has a large weight, the rear pillars on the left and right sides of the rear portion of the vehicle body are provided with back door stays for assisting the opening / closing operation of the flip-up type back door (for example, , Patent Document 1). Moreover, in order to easily open and close a back door having a large weight, electrification of the back door opening / closing operation has been introduced.

JP, 2009-107444, A

  However, in the above-described conventional vehicle body rear structure, with the electrification of the back door opening / closing operation, the supporting weight of the back door stay increases, and it becomes necessary to add electrical components, resulting in a large diameter of the back door stay. Therefore, there is a problem that the back door stay cannot be stored in the stay storing portion having the conventional storage space. On the other hand, if the rear pillar at the rear of the vehicle body is simply recessed to the front side of the vehicle to accommodate the back door stay to increase the accommodation space of the stay accommodating portion, the second moment of area of the rear pillar is reduced and the torsional rigidity is reduced. There was a problem that it would end up.

  The present invention has been made in view of such an actual situation, and an object thereof is to displace the stay housing portion toward the front of the vehicle by the load on the front portion of the vehicle applied to the mounting portion of the back door stay when the back door is opened, Along with this, the pillar reinforcement prevents the first inward vertical wall of the pillar inner panel from collapsing outward in the vehicle width direction by providing a rear structure for the vehicle body that can prevent corner deformation. To do.

  In order to solve the problems of the above-mentioned conventional techniques, the present invention provides a rear pillar provided in the rear part of a vehicle body and having a closed cross section formed by a pillar outer panel and a pillar extension panel outside the vehicle body and a pillar inner panel inside the vehicle body. The pillar extension panel is provided with a stay housing portion of a back door stay that is formed so as to be recessed toward the front of the vehicle and that supports the load of the back door when the back door is opened and closed. In the vehicle body rear structure that is housed in the stay housing along the rear pillar when the back door is closed, the pillar inner panel is a first inward vertical wall facing inward in the vehicle width direction. A first frontward vertical wall extending outward from the front end of the first inward vertical wall on the vehicle front side in the vehicle width direction, and the first inward direction is provided in the closed cross section. A corner portion formed by a vertical wall and the first forward facing vertical wall is provided, and the pillar reinforcement fixed to the first inward facing vertical wall and the first forward facing vertical wall is provided. It is placed across the corners.

As described above, the vehicle body rear structure according to the present invention has a rear pillar that is provided in the vehicle body rear portion and has a closed cross-section formed by the pillar outer panel and the pillar extension panel outside the vehicle body, and the pillar inner panel inside the vehicle body, The pillar extension panel is formed with a recess toward the front of the vehicle, and is provided with a stay housing portion of a back door stay that supports the load of the back door when the back door is opened and closed. In the closed state, the stay is accommodated in the stay accommodating portion along the rear pillar, and the pillar inner panel includes a first inward vertical wall facing inward in a vehicle width direction, and the first inward facing wall. A first front vertical wall extending from the front end portion of the vertical wall located on the vehicle front side toward the vehicle width direction outer side is provided, and the first inward vertical wall and the first vertical wall are provided in the closed cross-section portion. A corner formed by a front facing vertical wall is provided, and a pillar reinforcement fixed to the first inward facing vertical wall and the first front facing vertical wall is disposed across the corner. ing.
Therefore, according to the vehicle body rear structure of the present invention, due to the reaction force when the back door is opened, the stay housing portion is displaced forward of the vehicle due to the load on the front portion of the vehicle applied to the mounting portion of the back door stay, which is accompanied by this. Since the pillar reinforcement can restrain the movement of the first inward vertical wall of the pillar inner panel falling outward in the vehicle width direction, deformation of the corners provided in the closed cross-section can be prevented. can do. Further, the pillar reinforcement also has an effect of preventing deformation such as opening or closing of a corner due to a torsional stress generated in the back door opening when the vehicle is traveling.
Moreover, according to the vehicle body rear structure of the present invention, even when the opening / closing operation of the back door is electrified, the back door stay does not interfere with the back door when the back door is closed, and the back door stay is stored. Can be securely stored in the unit.

FIG. 1 is a front view of a vehicle body rear part of a vehicle to which a structure according to an embodiment of the present invention is applied, as viewed from the vehicle rear side. It is a perspective view which shows the Z section in FIG. 1 in the state which removed the back door. It is a perspective view which expands and shows the fixed part vicinity of the back door stay in the vehicle body rear structure of this embodiment. It is a perspective view which expands and shows the fixed state of the pillar reinforcement in the vehicle body rear structure of this embodiment. It is the sectional view on the AA line in FIG.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
1 to 5 show a vehicle body rear structure according to an embodiment of the present invention. In the figure, the arrow Fr direction indicates the front of the vehicle, and the arrow I direction indicates the inside of the vehicle width direction.

As shown in FIG. 1, a vehicle to which the vehicle body rear structure according to the embodiment of the present invention is applied is a hatchback type automobile including a flip-up type back door 1. A back door opening 21 that is opened and closed by the door 1, and left and right rear pillars 3 that form the back door opening 21 are provided.
As shown in FIG. 5, the rear pillar 3 includes a pillar outer panel 31 and a pillar extension panel 32 on the outer side of the vehicle body, a pillar inner panel 33 on the inner side of the vehicle body, and the like. The pillar outer panel 31, the pillar extension panel 32, and the pillar inner panel 33. A closed cross-section portion D is formed inside the rear pillar 3 by joining adjacent overlapping portions of the panel 33 by welding or the like.
In addition, as shown in FIGS. 2, 3 and 5, the pillar extension panel 32 is formed in a recessed shape toward the pillar inner panel 33 in the front of the vehicle compartment, and when the back door 1 is opened and closed. Is provided with a stay housing portion 30 of the back door stay 4 that supports the load of the back door stay 4, and the back door stay 4 is housed in the stay housing portion 30 along the rear pillar 3 when the back door 1 is closed. There is. That is, the stay housing portion 30 has a U-shaped cross section in which the entire stay housing portion 30 is recessed toward the pillar inner panel 33 and the opening portion faces the vehicle rear side, and the stay housing portion 30 may surround the outer peripheral portion of the back door stay 4. It has a possible size. Moreover, the stay housing portion 30 is located on the front side of the vehicle at a predetermined distance from the back door 1 in the closed state, and the back door stay 4 housed in the stay housing portion 30 is in the closed state. 1 is configured so as not to interfere with 1.

As shown in FIGS. 2, 3 and 5, the back door stay 4 of the present embodiment is a stay compatible with the electrification of the opening / closing operation of the back door 1, and the electrical component (via the harness 41 above the vehicle). (Not shown), and is configured to be operated by the electric component. Such a back door stay 4 has an upper end portion 4a located above the vehicle and a lower end portion 4b located below the vehicle when the back door 1 is closed. The upper end 4a of the back door stay 4 is rotatably attached to the pillar extension panel 32 via the stay bracket 5 having the pin 5a, and the upper end of the back door stay 4 is attached to the tip of the pin 5a. A ball-shaped body that fits inside 4a is formed. A lower end portion 4b of the back door stay 4 is attached to the back door 1 via a fastening member 6.
The stay bracket 5 is tightened and fixed to the pillar extension panel 32 by using a pair of upper and lower bolts 51 and nuts 52, and is attached to the place where the stay bracket 5 is fixed and the back surface side of the pillar extension panel 32 located in the peripheral region. The reinforcement reinforcement 7 for reinforcing the mounting portion B of the back door stay 4 is arranged so as to be joined to the pillar extension panel 32.

On the other hand, as shown in FIGS. 4 and 5, the pillar inner panel 33 of the present embodiment is entirely bent into a crank shape in cross section, and has a first inward vertical wall 33A facing inward in the vehicle width direction, It has the 1st front facing vertical wall 33B extended toward the vehicle width direction outside from the front end part 33a located in the vehicle front side of this 1st inward facing vertical wall 33A. That is, the first inward vertical wall 33A extends along the vehicle front-rear direction, the first frontward vertical wall 33B extends along the vehicle width direction, and the first inward vertical wall 33A and the first frontward vertical wall 33A. 33B and L-shaped in cross section, a flange portion 33b that is joined to the inner flange 32b of the pillar extension panel 32 is bent and formed on the vehicle rear side of the first inward vertical wall 33A.
Moreover, in the closed cross-section portion D of the rear pillar 3, a corner portion 33C formed by the first inward vertical wall 33A and the first forward vertical wall 33B is provided along the vertical direction of the rear pillar 3. The corner portion 33C is formed in a bent shape projecting obliquely inward of the front of the vehicle. Then, in the closed cross-section portion D at a position corresponding to the mounting portion B of the back door stay 4, a plurality of left and right side portions are joined to the first inward vertical wall 33A and the first forward vertical wall 33B. A fixed plate-shaped pillar reinforcement 8 is provided, and the pillar reinforcement 8 is disposed diagonally across the corner 33C by placing the corner 33C of the pillar inner panel 33 therebetween. There is. Therefore, the pillar reinforcement 8 has a struting function when the first inward vertical wall 33A collapses outward in the vehicle width direction due to the displacement of the stay housing portion 30 toward the front of the vehicle. In addition, the pillar reinforcement 8 has an effect of preventing the corner portion 33C from being deformed such that the corner portion 33C is opened or closed due to the torsional stress generated in the back door opening portion 21 when the vehicle is traveling.

Further, as shown in FIG. 5, the pillar extension panel 32 provided with the stay accommodating portion 30 has a second inward vertical wall 32A that faces inward in the vehicle width direction. The wall 32A is arranged to face the first inward vertical wall 33A of the pillar inner panel 33 with a space therebetween. That is, the second inward vertical wall 32A extends along the vehicle front-rear direction. Along with this, a space S along the vehicle front-rear direction is formed in the rear pillar 3 by the first inward vertical wall 33A of the pillar inner panel 33 and the second inward vertical wall 32A of the pillar extension panel 32. It will be formed continuously with the closed section D. The space portion S along the vehicle front-rear direction has an effect of suppressing the first inward vertical wall 33A from collapsing outward in the vehicle width direction when the stay housing portion 30 is displaced forward of the vehicle.

Further, as shown in FIG. 5, the pillar extension panel 32 of the present embodiment is formed by bending the rear end portion 32a of the second inward vertical wall 32A located on the vehicle rear side inward in the vehicle width direction. It has a second front vertical wall 32B. That is, the second front vertical wall 32B extends along the vehicle width direction, and the inner flange 32b joined to the flange 33b of the pillar inner panel 33 is provided inside the second front vertical wall 32B in the vehicle width direction. It is bent and formed at the rear of the vehicle. The second front vertical wall 32B has an effect of further suppressing the first inward vertical wall 33A from collapsing outward in the vehicle width direction when the stay housing portion 30 is displaced forward of the vehicle.

As described above, the vehicle body rear portion structure according to the embodiment of the present invention is provided in the vehicle body rear portion 2, and the closed cross-section portion D is formed by the pillar outer panel 31 and the pillar extension panel 32 on the vehicle body outer side and the pillar inner panel 33 on the vehicle body inner side. It has a rear pillar 3 that is formed. The pillar extension panel 32 is provided with a stay housing portion 30 of the back door stay 4 which is formed to be recessed toward the front of the vehicle and supports the load of the back door 1 when the back door 1 is opened and closed. The back door stay 4 is housed in the stay housing portion 30 along the rear pillar 3 when the back door 1 is closed.
On the other hand, the pillar inner panel 33 includes a first inward vertical wall 33A facing inward in the vehicle width direction and a front end portion 33a located on the vehicle front side of the first inward vertical wall 33A toward the vehicle width direction outside. It has a first front facing vertical wall 33B that extends. Moreover, a corner portion 33C formed by the first inward vertical wall 33A and the first forward vertical wall 33B is provided in the closed cross section D, and the first inward vertical wall 33A and the first inward vertical wall 33A are provided. The pillar reinforcement 8 fixed to the first vertical wall 33B is disposed across the corner portion 33C.
Therefore, in the vehicle body rear portion structure of the present embodiment, the reaction force generated when the back door 1 is opened becomes a load on the front portion of the vehicle applied to the mounting portion B of the back door stay 4, and the stay housing portion 30 is displaced forward of the vehicle by the load. When trying to do so, it is possible to suppress the movement of the first inward vertical wall 33A of the pillar inner panel 33 falling to the outside in the vehicle width direction by the tensioning action of the pillar reinforcement 8. In addition, the pillar reinforcement 8 has an effect of preventing the corner portion 33C from being deformed such that the corner portion 33C is opened or closed due to the torsional stress generated in the back door opening portion 21 when the vehicle is traveling.
Further, according to the vehicle body rear portion structure of the present embodiment, even if a load in front of the vehicle is applied to the mounting portion B of the back door stay 4, the corner portion 33C provided in the closed cross section portion D can be prevented from being deformed, and the stay portion can be prevented. The shape of the storage portion of the storage portion 30 can be secured. Moreover, in the vehicle body rear structure of the present embodiment, due to the existence of the pillar reinforcement 8 arranged across the corner portion 33C, the accommodation space of the stay accommodating portion 30 can be increased without reducing the torsional rigidity of the rear pillar 3. Therefore, even when the back door 1 is electrically operated, the back door stay 4 does not interfere with the back door stay 4 when the back door 1 is closed. It can be surely stored in the stay storing portion 30.

Further, in the vehicle body rear structure of the present embodiment, the pillar extension panel 32 provided with the stay housing portion 30 has the second inward vertical wall 32A facing inward in the vehicle width direction. The first inward vertical wall 33A and the second inward vertical wall 32B of the pillar extension panel 32 form a space S along the vehicle front-rear direction.
Therefore, in the vehicle body rear portion structure of the present embodiment, it is possible to suppress the tilting operation of the first inward vertical wall 33A outward in the vehicle width direction due to the displacement of the stay housing portion 30 forward of the vehicle in the space portion S. Therefore, when the back door 1 is closed, the front side of the vehicle that is added to the vehicle rear side flanges 33b and 32b of the first inward vertical wall 33A of the pillar inner panel 33 and the second inward vertical wall 32B of the pillar extension panel 32. It is possible to effectively prevent the deformation of the corner portion 33C due to the load.

Further, in the vehicle body rear portion structure of the present embodiment, the pillar extension panel 32 is formed by bending the rear end portion 32a located on the vehicle rear side of the second inward vertical wall 32A inward in the vehicle width direction. The second front vertical wall 32B supports the first inward vertical wall 33A of the pillar inner panel 33, and the back door opening 21 opened and closed by the back door 1 is twisted. The rigidity can be increased, the first inward vertical wall 33A is further prevented from falling toward the outside in the vehicle width direction due to the displacement of the stay housing portion 30 to the front of the vehicle, and the deformation of the corner portion 33C is further reduced. be able to.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

1 Back Door 2 Vehicle Rear Part 3 Rear Pillar 4 Back Door Stay 4a Upper End 4b Lower End 5 Stay Bracket 5a Pin 6 Fastening Member 7 Stay Reinforcement 8 Pillar Reinforcement 30 Stay Storage Part 31 Pillar Outer Panel 32 Pillar Extension Panel 32A Second Inward vertical wall 32B Second forward vertical wall 32a Rear end 33 Pillar inner panel 33A First inward vertical wall 33a Front end 33B First forward vertical wall 33C Corner B Backdoor stay attachment D Closed Section S Space

Claims (3)

A rear pillar is provided at a rear portion of the vehicle body and has a closed cross section formed by a pillar outer panel and a pillar extension panel on the outer side of the vehicle body and a pillar inner panel on the inner side of the vehicle body, and the pillar extension panel is recessed toward the front of the vehicle. And a stay housing portion of the back door stay that supports a load of the back door when the back door is opened and closed, and the back door stay includes the stay housing portion along the rear pillar when the back door is closed. In the rear structure of the vehicle body that is to be stored in
The pillar inner panel includes a first inward vertical wall facing inward in the vehicle width direction, and a first inwardly extending vertical wall extending outward from the front end of the first inward vertical wall on the vehicle front side. Has a vertical wall facing forward,
Inside the closed cross-section part, a corner portion formed by the first inward vertical wall and the first frontward vertical wall is provided, and the first inward vertical wall and the first inward vertical wall are provided. A rear structure for a vehicle body, wherein pillar reinforcements fixed to a front wall are arranged so as to straddle the corners.   The pillar extension panel provided with the stay housing portion has a second inward vertical wall facing inward in the vehicle width direction, and the first inward vertical wall of the pillar inner panel and the pillar extension are provided. The vehicle body rear structure according to claim 1, wherein a space portion along a vehicle front-rear direction is formed by the second inward vertical wall of the panel.   The pillar extension panel has a second forward facing vertical wall formed by bending a rear end portion of the second inward facing vertical wall located on the vehicle rear side inward in the vehicle width direction. The vehicle body rear structure according to claim 2.

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