JP2014101033A - Vehicle lower structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lower structure that can effectively suppress a stress concentration occurring at a connection between a rear end of a rocker and a lower end of a rear pillar.SOLUTION: A vehicle lower structure comprises: a rocker 28; a lower end 18B of a rear pillar 18 connected to a rear end 28C of the rocker 28; and a reinforcement member 40. One end of the reinforcement member 40 is connected to the rear end 28C, the other end of the reinforcement member 40 is connected to the lower end 18B across a connection position J. In the reinforcement member 40 is provided a low-rigidity portion 44 that is provided nearer a vehicle body rear side and a vehicle body upper side than the connection position J and forms a folding starting point of the rear pillar 18 toward a vehicle front side when a frontal collision occurs.

Description

  The present invention relates to a vehicle lower structure in which a rear end portion of a rocker and a lower end portion of a rear pillar are coupled.

  Patent Document 1 below discloses a side body structure of an automobile. In this side body structure, one end of the rear pillar reinforcement lower member is joined to the vehicle rear end of the side sill reinforcement. The other end of the rear pillar reinforcement lower member is provided along the wheel house panel and joined to a rear pillar reinforcement extending in the vehicle vertical direction.

JP 2006-31358 A

  In the above-mentioned side body structure, for example, inertia toward the vehicle front side acts on the rear pillar reinforcement at the time of a frontal collision. Due to this inertia, a behavior occurs in which the rear pillar reinforcement is tilted toward the front side of the vehicle, with the joint portion between the side sill reinforcement and the lower pillar reinforcement lower member as the center of rotation. For this reason, since stress concentrates on the joint location, there is a possibility that the vehicle rear end of the side sill reinforcement may break, and there is room for improvement.

  In view of the above facts, the present invention has an object to obtain a vehicle lower structure that can effectively suppress stress concentration occurring at a joint portion between a rear end portion of a rocker and a lower end portion of a rear pillar.

  According to the first aspect of the present invention, a vehicle lower structure includes a rocker disposed at a lower end portion of a vehicle side portion along a vehicle front-rear direction and a rear end portion of the rocker. One end is joined to the lower end of the extended rear pillar and the rear end of the rocker, and the other end is joined to the lower end of the rear pillar across the joining location. And a rigidity lowering portion that forms a starting point of bending of the rear pillar toward the vehicle front side at the time of a frontal collision.

  In the first aspect of the invention, one end of the reinforcing member is joined to the rear end portion of the rocker, and the other end of the reinforcing member is joined to the lower end portion of the rear pillar across the coupling portion. Further, the reinforcing member is provided with a rigidity reduction portion.

  Here, the rigidity reduction portion is provided on the vehicle rear side and the vehicle upper side with respect to the connecting portion between the rear end portion of the rocker and the lower end portion of the rear pillar in the reinforcing member. For this reason, if the inertia which falls to the vehicle front side in a rear pillar arises by the front collision of a vehicle, a rear pillar will bend to the vehicle front side from a rigidity reduction part. Therefore, before the deformation due to the stress concentration occurs at the connecting portion between the rear end of the rocker and the lower end of the rear pillar, the energy due to the frontal collision can be absorbed by the deformation of the reinforcing member.

  In the vehicle lower structure according to the invention described in claim 2, in claim 1, the rocker is disposed on the inner side of the rocker outer panel and the rocker outer panel in the vehicle width direction, along the vehicle longitudinal direction and the vehicle width direction. A reinforcing member including an extended upper wall portion and a side wall portion bent downward from the inner end of the vehicle width direction of the upper wall portion and having a closed cross section with the rocker outer panel. The upper wall reinforcing portion provided along the upper wall portion and the lower end portion of the rear pillar, and the upper wall reinforcing portion bent from the inner end in the vehicle width direction to the vehicle lower direction and at the side wall portion and the lower end portion of the rear pillar. The rigidity reduction part is provided including the ridgeline which passes along the boundary part of an upper wall reinforcement part and a side wall reinforcement part.

  According to the invention of claim 2, the reinforcing member includes the upper wall reinforcing portion and the side wall reinforcing portion, and the rigidity reduction portion is provided including a ridge line passing through a boundary portion between the upper wall reinforcing portion and the side wall reinforcing portion. It has been. Here, the part which becomes the ridgeline of the reinforcing member is a load transmission path through which most of the load generated during the frontal collision is transmitted. Since the rigidity reduction portion is provided at a place where such a larger load is transmitted, the load transmission path is divided, and the reinforcing member is deformed at the aimed position.

  In the lower vehicle structure according to the third aspect of the present invention, in the first or second aspect, the rigidity reduction portion is constituted by a bead in which the reinforcing member is recessed or protruded.

  According to the invention of claim 3, the rigidity reduction portion is constituted by a bead. The bead has a simple structure in which a part of the reinforcing member is recessed or protruded when the reinforcing member is pressed, and can be formed simultaneously with the forming of the reinforcing member.

  In the vehicle lower structure according to the invention described in claim 4, in claim 3, the rigidity reduction portion includes a bead provided in the upper wall reinforcing portion with the vehicle width direction as the longitudinal direction.

  According to the invention which concerns on Claim 4, the rigidity reduction part is comprised including the bead provided in the ridgeline and upper wall reinforcement part of the reinforcement member. Here, the bead provided in the upper wall reinforcing portion has the vehicle width direction as the longitudinal direction. For this reason, when the inertia which falls to the vehicle front side occurs in the rear pillar due to the frontal collision of the vehicle, the bead provided in the upper wall reinforcing portion is configured to easily bend the rear pillar to the vehicle front side.

  In the vehicle lower structure according to the invention described in claim 5, in claim 3 or claim 4, the rigidity reduction portion includes a bead provided in the side wall reinforcing portion along the vehicle longitudinal direction and the vehicle vertical direction. It is configured.

  According to the invention which concerns on Claim 5, the rigidity reduction part is comprised including the bead provided in the ridgeline and side wall reinforcement part of a reinforcement member, or a ridgeline, an upper wall reinforcement part, and a side wall reinforcement part. Here, the bead provided in the side wall reinforcing portion further enables the rear pillar to be bent toward the vehicle front side at the target position in addition to the bead provided including the ridgeline.

  In the lower vehicle structure according to the sixth aspect of the present invention, in the first or second aspect, the rigidity reduction portion is formed by a through hole that penetrates the reinforcing member.

  According to the invention which concerns on Claim 6, the rigidity reduction part is comprised by the through-hole. Here, like the bead, the through-hole has a simple structure that allows only a part of the reinforcing member to pass through when the reinforcing member is pressed, and can be formed simultaneously with the forming of the reinforcing member.

  The vehicle lower structure according to the first aspect of the present invention has an excellent effect that stress concentration generated at a joint portion between the rear end portion of the rocker and the lower end portion of the rear pillar can be effectively suppressed.

  Since the vehicle lower structure according to the invention described in claim 2 includes the rigidity reduction portion including the ridge line of the reinforcing member, the rear pillar can be bent toward the vehicle front side at the target position. It has an excellent effect of being able to.

  The vehicle lower structure according to the invention described in claim 3 has an excellent effect that the manufacturing cost can be reduced.

  In the vehicle lower structure according to the invention described in claim 4, in addition to the bead provided on the ridgeline, the rigidity lowering portion including the bead provided on the upper wall reinforcing portion is the starting point, so the target position The rear pillar has an excellent effect of being able to bend toward the vehicle front side.

  In the vehicle lower part structure according to the invention described in claim 5, in addition to the bead provided on the ridgeline, the rigidity lowering portion including the bead provided on the side wall reinforcing portion is the starting point. The rear pillar has an excellent effect of being able to bend the vehicle forward.

  The vehicle lower structure according to the invention described in claim 6 has an excellent effect that the manufacturing cost can be reduced similarly to the bead.

A vehicle to which the vehicle lower structure according to the first embodiment is applied, as viewed from the inner side in the vehicle width direction of a partial cross-sectional structure when cut along the vehicle longitudinal direction and the vehicle vertical direction in an intermediate portion in the vehicle width direction. FIG. It is the expansion perspective view which looked at the joint place of the rear end part of the rocker of the vehicle lower part structure concerning a 1st embodiment, and the lower end part of a rear pillar from the inside of the vehicle width direction. FIG. 3 is an enlarged side view of the vehicle lower structure shown in FIG. 2 viewed from the inside in the vehicle width direction. FIG. 3 is an enlarged perspective view of a vehicle lower structure corresponding to FIG. 2 in a state in which a reinforcing member is removed. FIG. 3 is an enlarged perspective view when a part of the vehicle lower structure shown in FIG. 2 is cut along a vehicle width direction and a vehicle vertical direction. It is principal part sectional drawing of the reinforcement member and rigidity reduction part of a vehicle lower structure when cut | disconnected by the FF line shown by FIG. It is principal part sectional drawing of the reinforcement member and rigidity reduction part corresponding to FIG. 6 of the vehicle lower part structure which concerns on 2nd Embodiment. It is principal part sectional drawing of the reinforcement member and rigidity reduction part corresponding to FIG. 6 of the vehicle lower part structure which concerns on 3rd Embodiment.

[First Embodiment]
Hereinafter, with reference to FIGS. 1-6, the vehicle lower part structure which concerns on 1st Embodiment of this invention is demonstrated. Note that an arrow FR appropriately shown in the figure indicates the vehicle front side, and an arrow UP indicates the vehicle upper side. An arrow IN indicates the inner side in the vehicle width direction.

(Schematic configuration of the entire vehicle)
As shown in FIG. 1, a front pillar 14, a center pillar 16, and a rear pillar 18 are erected in this order from the vehicle front side to the vehicle rear side on the vehicle side portion 12 of the automobile 10. Although not shown, the front pillar 14, the center pillar 16, and the rear pillar 18 are disposed in pairs on the vehicle side portions 12 on both sides in the vehicle width direction of the automobile 10, and both have the same structure. In the following, only one vehicle side portion 12 will be described.

  The front pillar 14 is disposed along the front edge of the front door opening 20 formed in the vehicle side portion 12 and is a vehicle skeleton member whose longitudinal direction is substantially the vehicle vertical direction. The center pillar 16 is disposed between the front door opening 20 and the rear door opening 22 and is a vehicle skeleton member having a longitudinal direction substantially in the vehicle vertical direction. Further, the rear pillar 18 is disposed along the rear edge of the rear door opening 22 and is a vehicle skeleton member having a longitudinal direction substantially in the vehicle vertical direction. An upper end portion 18A of the rear pillar 18 is connected to a rear end portion 24C of the roof side rail portion 24 on the vehicle rear side. A rear end portion 28C of the rocker 28 on the vehicle rear side is connected to the lower end portion 18B of the rear pillar 18. The rocker 28 is disposed along the lower edge of the front door opening 20 and the rear door opening 22 and is a vehicle skeleton member whose longitudinal direction is the vehicle front-rear direction. Details of the structure around the joint portion between the lower end portion 18B of the rear pillar 18 and the rear end portion 28C of the rocker 28, that is, the details of the vehicle lower portion structure according to the present embodiment will be described later.

  A rear wheel house inner panel 34 is provided on the vehicle rear side of the rear pillar 18. Further, a floor panel 32 is provided inside the rocker 28 in the vehicle width direction, and a roof panel 26 is provided inside the roof side rail portion 24 in the vehicle width direction.

(Structure of the vehicle lower structure)
2 to 5 show an enlarged perspective view or an enlarged side view of the portion indicated by the arrow A in FIG. As shown in these drawings, the vehicle lower structure according to the present embodiment includes a rocker 28, a lower end portion 18B of the rear pillar 18 coupled to the rear end portion 28C of the rocker 28, and one end at the rear end portion 28C. Are joined, and the other end is provided with a reinforcing member 40 joined to the lower end portion 18B across the joint portion J between the rear end portion 28C and the lower end portion 18B.

  In particular, as shown in FIG. 5, the rocker 28 includes a rocker outer panel 28D disposed on the outer side in the vehicle width direction, and is disposed on the inner side in the vehicle width direction with respect to the rocker outer panel 28D. The rocker inner panel 28E is formed. The rocker outer panel 28D includes an upper wall portion 28G extending along the vehicle front-rear direction and the vehicle width direction, a side wall portion 28H bent downward from the outer end of the upper wall portion 28G in the vehicle width direction, A lower wall portion 28I that is bent inward in the vehicle width direction from the lower end of the portion 28H. Further, the rocker outer panel 28D is provided with a flange portion 28F in which the inner end in the vehicle width direction of the upper wall portion 28G is bent toward the vehicle upper side, and the inner end in the vehicle width direction of the lower wall portion 28G is provided in the vehicle. A flange portion 28J bent downward is provided. With such a configuration, when viewed from the front side of the vehicle, the cross-sectional shape of the rocker outer panel 28 </ b> D is a hat shape that is opened inward in the vehicle width direction. Similarly, the rocker inner panel 28E includes an upper wall portion 28L, a side wall portion 28M bent from the inner end in the vehicle width direction of the upper wall portion 28L to the vehicle lower side, and a lower end of the side wall portion 28M in the vehicle width direction. A lower wall portion 28N bent outward, a flange portion 28K and a flange portion 28O are provided. The cross-sectional shape of the rocker inner panel 28 </ b> E is a hat shape opened to the outside in the vehicle width direction when viewed from the vehicle front side.

  As shown in FIGS. 2 to 5, the rear pillar 18 has a closed cross-sectional structure similar to the rocker 28. That is, the rear pillar 18 is disposed on the outer side in the vehicle width direction and has a hat-shaped cross-sectional shape, and the rear pillar outer panel 18D is disposed on the inner side in the vehicle width direction than the rear pillar outer panel 18D and has a hat-shaped cross-sectional shape. The rear pillar outer panel 18D includes a rear pillar inner panel 18E that forms a closed section (not shown). In particular, as shown in FIG. 4, the rear pillar outer panel 18 </ b> D is connected to the rocker outer panel 28 </ b> D at a joint J between the rear end portion 28 </ b> C of the rocker 28 and the lower end portion 18 </ b> B of the rear pillar 18. The joint location J is the vehicle rear end of the upper wall portion 28L of the rocker inner panel 28E, and is a location where the flat portion of the upper wall portion 28L is interrupted.

  As shown in FIGS. 2 to 4, the side wall 28M of the rocker inner panel 28E extends further to the vehicle rear side than the vehicle rear end (joint point J) of the upper wall 28L, and is used as a welding region. An extended portion 28Q is provided. The lower end portion of the rear pillar inner panel 18E includes an upper wall portion 18L and a side wall portion 18M bent from the inner end of the upper wall portion 18L in the vehicle width direction to the vehicle lower side. The lower end portion of the rear pillar inner panel 18E is connected to the rear wheel house inner panel 34 and also serves as a part of the rear wheel house inner panel 34. A lower end portion of the rear pillar inner panel 18E (lower end portion 18B of the rear pillar 18) is inserted into an inner side surrounded by the vehicle rear end of the upper wall portion 28L and the extension portion 28Q, and the extension portion 28Q (rear side of the rocker 28). The end portion 28C) and the welded portion 46 are joined by spot welding or the like. This joining is performed by overlapping reinforcing members 40 described later.

  As shown in FIGS. 2 to 5, the reinforcing member 40 has a function of increasing the rigidity of the joint J between the rear end portion 28 </ b> C of the rocker 28 and the lower end portion 18 </ b> B of the rear pillar 18. The reinforcing member 40 includes an upper wall reinforcing portion 42A provided along the upper wall portion 28L of the rocker inner panel 28E and the upper wall portion 18L of the lower end portion of the rear pillar inner panel 18E, and the vehicle width direction of the upper wall reinforcing portion 42A. A side wall reinforcing portion 42B provided along the side wall portion 28M of the rocker inner panel 28E and the side wall portion 18M of the lower end portion of the rear pillar inner panel 18E is provided while being bent downward from the inner end of the vehicle. Further, a flange portion 42C bent toward the vehicle upper side is provided at the outer end of the upper wall reinforcing portion 42A in the vehicle width direction. The front portion of the upper wall reinforcing portion 42A is a flat portion along the upper wall portion 28L of the rocker inner panel 28E in a side view. The rear portion of the upper wall reinforcing portion 42A is a flat portion along the upper wall portion 18L of the rear pillar inner panel 18E in a side view. Further, the intermediate portion of the upper wall reinforcing portion 42A is an arcuate portion that smoothly connects from the upper wall portion 28L to the upper wall portion 18L in a side view. The lower end portion of the side wall reinforcing portion 42B on the vehicle lower side overlaps with the extending portion 28Q on the outer side in the vehicle width direction, and the rear end portion on the vehicle rear side extends to the vicinity of the rear wheel house inner panel 34. That is, the shape of the side wall reinforcing portion 42B is a substantially triangular portion in a side view.

  As shown in FIGS. 2 to 6, the reinforcing member 40 has a rigidity that is a starting point of bending of the rear pillar 18 toward the front side of the vehicle at the time of a frontal collision on the rear side and the upper side of the vehicle with respect to the joint J. A lowering portion 44 is provided. As shown in FIGS. 2 and 3, the rigidity reduction portion 44 includes a ridge line EL drawn on a portion bent from the front portion to the rear portion on the boundary between the upper wall reinforcement portion 42 </ b> A and the side wall reinforcement portion 42 </ b> B. 44A of the 1st rigidity fall part provided in this is provided. In FIG. 2, the ridgeline EL is indicated by a thick broken line, but is not an actual broken line but is a line described for convenience in order to facilitate understanding. 44 A of 1st rigidity reduction parts are comprised by the bead recessedly provided so that it might become circular arc-shaped cross-sectional shape from the vehicle interior side toward the vehicle interior outer side (refer FIG. 6). 44 A of 1st rigidity fall parts are set as the structure which suppresses the deformation | transformation of the flat site | part in the vehicle rear end part of the rocker 28, especially the upper wall part 28L of the rocker inner panel 28E in front collision. For this reason, 44 A of 1st rigidity reduction parts are provided in the vehicle back side and vehicle upper side rather than the flat start location P where the circular arc-shaped site | part of the intermediate part of the reinforcement member 40 was complete | finished. Here, the upper wall portion 18L is set at an angle of, for example, about 45 degrees with respect to the horizontal plane. If an extension line of the upper wall portion 18L to the vehicle lower side is a tangent line, an arcuate portion on the tangent line is formed. Corresponds to the flat start point P (see FIG. 3). 44 A of 1st rigidity fall parts are arrange | positioned by the distance L from the flat start location P along the ridgeline EL or the upper wall reinforcement part 42A.

  The rigidity reduction portion 44 includes a second rigidity reduction portion 44B that is connected to the first rigidity reduction portion 44A and is configured by a bead provided in the upper wall reinforcement portion 42A with the vehicle width direction as a longitudinal direction. ing. Further, the rigidity reduction portion 44 is connected to the first rigidity reduction portion 44A at the upper end portion, and is a third rigidity reduction portion 44C configured by a bead provided on the side wall reinforcement portion 42B along the vehicle longitudinal direction and the vehicle vertical direction. It has. The shape of the third rigidity reduction portion 44C is substantially inverted trapezoidal in a side view. The second rigidity reduction portion 44B has the same configuration as that of the first rigidity reduction portion 44A. Specifically, the second rigidity reduction portion 44B is disposed at a distance L from the flat start position P, and is particularly shown in FIG. Thus, the cross-sectional shape of the bead is an arc. Here, the second reduced rigidity portion 44B is provided over the entire region of the upper wall reinforcing portion 42A in the vehicle width direction. The third rigidity reduction portion 44C has basically the same configuration as that of the second rigidity reduction portion 44B. The area of the third rigidity reduction portion 44C is set larger than the areas of the first rigidity reduction portion 44A and the second rigidity reduction portion 44B. For this reason, in the frontal collision, the side wall reinforcing portion 42B can be deformed in a wide range.

(Operation and effect of the present embodiment)
According to the vehicle lower structure according to the present embodiment, the rigidity lowering portion 44 is provided on the reinforcing member 40 on the vehicle rear side and the vehicle upper side with respect to the coupling point J. For this reason, when the inertia which falls to the vehicle front side occurs in the rear pillar 18 due to the frontal collision of the vehicle, stress concentration occurs in the rigidity reduction portion 44, and the rear pillar 18 bends toward the vehicle front side from the rigidity reduction portion 44. . Therefore, before the deformation due to the stress concentration occurs at the joint J between the rear end portion 28C of the rocker 28 and the lower end portion 18B of the rear pillar 18, energy due to the frontal collision can be absorbed by the rigidity reduction portion 44. A region surrounded by a broken line with a symbol C in FIG. 2 is a deformation of the rear end portion 28C of the rocker 28 or a lower end portion 18B of the rear pillar 18 when the rigidity reduction portion 44 according to the present embodiment is not provided. This is a region where bending or bending occurs.

  According to such a vehicle lower structure according to the present embodiment, it is possible to effectively suppress the stress concentration generated at the joint portion J between the rear end portion 28C of the rocker 28 and the lower end portion 18B of the rear pillar 18.

  Further, in the vehicle lower structure according to the present embodiment, the rotation center when the rear pillar 18 falls to the vehicle front side is the rigidity reduction portion 44, and this rotation center is the vehicle rear side and the vehicle from the coupling point J. It is arranged on the upper side. For this reason, the reduction | decrease of passenger | crew space when the rear pillar 18 falls in the vehicle front side can be suppressed effectively.

  Furthermore, in the vehicle lower structure according to the present embodiment, the reinforcing member 40 includes the upper wall reinforcing portion 42A and the side wall reinforcing portion 42B, and the first rigidity decreasing portion 44A of the rigidity decreasing portion 44 is the upper wall reinforcing portion 42A. And the ridgeline EL passing through the boundary between the side wall reinforcing portion 42B. For this reason, the rear pillar 18 can be bent toward the vehicle front side at the target position.

  Further, in the vehicle lower structure according to the present embodiment, the rigidity reduction portion 44 is configured by a bead. The bead has a simple structure in which a part of the reinforcing member 40 is recessed when the reinforcing member 40 is pressed, and can be formed simultaneously with the forming of the reinforcing member 40. For this reason, the vehicle lower structure according to the present embodiment can reduce the manufacturing cost.

  Furthermore, in the vehicle lower structure according to the present embodiment, the rigidity reduction portion 44 includes a second rigidity reduction portion 44B whose longitudinal direction is the vehicle width direction in the upper wall reinforcement portion 42A. For this reason, when the inertia which falls in the vehicle front side occurs in the rear pillar 18 due to the frontal collision of the vehicle, the rear pillar 18 is easily bent toward the vehicle front side. Therefore, in the vehicle lower structure according to the present embodiment, in addition to the bead (first rigidity reduction portion 44A) provided on the ridgeline EL, the second rigidity reduction portion 44B including a bead provided on the upper wall reinforcement portion 42A. Therefore, the rear pillar 18 can be effectively bent toward the front side of the vehicle at the target position.

  In the vehicle lower structure according to the present embodiment, the rigidity reduction portion 44 includes a third rigidity reduction portion 44C that is a bead provided in the side wall reinforcement portion 42B. For this reason, it is possible to more effectively cause the rear pillar 18 to be bent toward the vehicle front side at the target position.

[Second Embodiment]
Next, a vehicle lower part structure according to the second embodiment of the present invention will be described with reference to FIG. In the second embodiment and the third embodiment to be described later, the same reference numerals are given to the constituent elements having the same functions as the constituent elements explained in the first embodiment, and the same reference numerals are given. Since the description of the constituent elements is duplicated, it will be omitted.

  In the vehicle lower structure according to the present embodiment, as shown in FIG. 7, the second rigidity reduction portion 44 </ b> B of the rigidity reduction portion 44 provided on the upper wall reinforcement portion 42 </ b> A of the reinforcement member 40 is It is comprised by the bead protruded so that it may become circular-arc-shaped cross-section toward the indoor side. Although not shown in the drawings, both the first rigidity reduction portion 44A and the third rigidity reduction portion 44C of the rigidity reduction portion 44 are configured by protruding beads similar to the second rigidity reduction portion 44B.

  In the vehicle lower structure according to the present embodiment, each of the first stiffness reduction portion 44A, the second stiffness reduction portion 44B, and the third stiffness reduction portion 44C of the stiffness reduction portion 44 is formed as a bead. Actions and effects similar to those obtained with the vehicle lower structure according to the first embodiment can be obtained.

[Third Embodiment]
Next, the vehicle lower part structure concerning the 3rd Embodiment of this invention is demonstrated using FIG. In the vehicle lower structure according to the present embodiment, as shown in FIG. 8, the second rigidity reduction portion 44B of the rigidity reduction portion 44 provided on the upper wall reinforcement portion 42A of the reinforcement member 40 is the upper wall reinforcement portion 42A. It is comprised by the through-hole which penetrated. Although not shown, the first rigidity reduction portion 44A and the third rigidity reduction portion 44C of the rigidity reduction portion 44 are the same as those in the first and second embodiments. In the first rigidity reduction portion 44A, a through hole having an opening shape such as a circle, an ellipse, a rectangle, or a triangle is used.

  In the vehicle lower structure according to the present embodiment, the first rigidity reduction portion 44A of the rigidity reduction portion 44 is a through hole. Like the bead, the through-hole has a simple structure that allows only a part of the reinforcing member 40 to pass through when the reinforcing member 40 is pressed, and can be formed simultaneously with the forming of the reinforcing member 40. Therefore, the vehicle lower structure according to the present embodiment has an effect that the manufacturing cost can be reduced similarly to the bead. In addition, since the first rigidity reduction portion 44A configured by the through hole has a lower bending rigidity than the rigidity reduction portion 44 configured by the bead, the bending of the rear pillar 18 becomes sharp.

[Supplementary explanation of the above embodiment]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the present invention includes the following modifications. In the above-described embodiment, the rigidity reduction portion 44 disposed on the reinforcing member 40 is the first rigidity reduction portion 44A, the second rigidity reduction portion 44B, and the third rigidity reduction portion 44C. In the present invention, only the first rigidity reduction portion 44A, only the first rigidity reduction portion 44A and the second rigidity reduction portion 44B, or only the first rigidity reduction portion 44A and the third rigidity reduction portion 44C is the rigidity reduction portion 44. It may be configured. In the above embodiment, the cross-sectional shape of the bead of the rigidity reduction portion 44 is an arc shape. However, in the present invention, the cross-sectional shape of the bead may be a rectangular shape, a trapezoidal shape, a V-shaped groove shape, or the like. Good.

DESCRIPTION OF SYMBOLS 10 Automobile 12 Vehicle side part 14 Front pillar 16 Center pillar 18 Rear pillar 18B Lower end part 18D Rear pillar outer panel 18E Rear pillar inner panel 18L, 28L Upper wall part 18M, 28M Side wall part 28 Rocker 28C Rear end part 28D Rocker outer panel 28E Rocker inner panel 28E Member 42A Upper wall reinforcement part 42B Side wall reinforcement part 44 Rigidity reduction part 44A 1st rigidity reduction part 44B 2nd rigidity reduction part 44C 3rd rigidity reduction part J Joint location

Claims (6)

A rocker arranged along the vehicle longitudinal direction at the lower end of the vehicle side,
A lower end portion of a rear pillar coupled to a rear end portion of the rocker and extending from the coupling portion to the vehicle upper side;
One end is joined to the rear end portion, and the other end is joined to the lower end portion of the rear pillar across the coupling portion,
A rigidity-reducing portion that is provided on the vehicle rear side and the vehicle upper side of the reinforcing member in the reinforcing member, and forms a starting point of bending of the rear pillar toward the vehicle front side at the time of a frontal collision;
Vehicle lower structure equipped with. The rocker includes a rocker outer panel, an upper wall portion that is disposed on the inner side in the vehicle width direction than the rocker outer panel, and extends along the vehicle front-rear direction and the vehicle width direction, and an inner side in the vehicle width direction of the upper wall portion. A rocker inner panel having a side wall portion bent in the vehicle downward direction from the end and forming a closed cross section with the rocker outer panel;
The reinforcing member includes an upper wall reinforcing portion provided along the upper wall portion and a lower end portion of the rear pillar, and the side wall is bent from the inner end in the vehicle width direction of the upper wall reinforcing portion to the vehicle lower side. And a side wall reinforcing portion provided along a lower end portion of the rear pillar,
The vehicle lower structure according to claim 1, wherein the rigidity reduction portion is provided including a ridge line passing through a boundary portion between the upper wall reinforcement portion and the side wall reinforcement portion.   The vehicle lower structure according to claim 1, wherein the rigidity reduction portion is configured by a bead in which the reinforcing member is recessed or protruded.   The vehicle lower structure according to claim 3, wherein the rigidity reduction portion includes a bead provided in the upper wall reinforcing portion with a vehicle width direction as a longitudinal direction.   The vehicle lower structure according to claim 3, wherein the rigidity reduction portion includes a bead provided on the side wall reinforcing portion along a vehicle front-rear direction and a vehicle vertical direction.   The vehicle lower structure according to claim 1, wherein the rigidity reduction portion is formed by a through-hole penetrating the reinforcing member.

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