JP2013220703A - Lower vehicle body structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lower vehicle body structure 2 of a vehicle 1 which can more efficiently transmit and disperse collision load from a side of a vehicle to a vehicle body lower part.SOLUTION: A lower vehicle body structure 2 of a vehicle 1 comprises a side sill 10, a rear wheel house 20, a floor panel 40, a rear side frame 50, a front side cross member 60 connected with the rear side frame 50, a rear side cross member 70, an impact bar 4 keeping a rear end at a rear end of the side sill 10 and a reinforcing member 30 for coupling the rear wheel house 20 to the side sill 10. The front side cross member 60 is arranged at a vehicle front side rather than the reinforcing member 30. The rear side cross member 70 is arranged at a vehicle rear side rather than the reinforcing member 30. Swollen parts 51 which are swollen toward the outside in a vehicle width direction from positions almost the same as the front side cross member 60 and rear side cross member 70 and abut on the side sill 10 at positions almost the same as the reinforcing member 30 are provided at the rear side frame 50.

Description

  The present invention relates to a lower vehicle body structure of a vehicle in which, for example, a collision load applied to a side door from the side of the vehicle is transmitted and distributed to a rear side frame.

  Conventionally, a collision load applied from the side of the vehicle from the viewpoint of protecting the passenger in the vehicle interior against a side collision in which another vehicle collides with the side of the vehicle or the side of the vehicle collides with an obstacle. Therefore, it is necessary to prevent the side door from being deformed and intruded into the vehicle interior.

  For this reason, the side door is provided with an impact bar (also referred to as a door beam) that receives a collision load from the side and suppresses deformation of the side door. And in order to suppress the penetration | invasion into the vehicle interior of a side door more, the technique which transmits and distributes a collision load to the vehicle body lower part via an impact bar is proposed.

  For example, the vehicle body structure described in Patent Document 1 includes a spacer provided in the side sill at the same height as the rear end of the door beam, a load transmission member that connects the spacer and the rear side frame, and a collision applied to the door beam. It is assumed that the load is transmitted and distributed to the rear side frame via the spacer and the load transmitting member.

  However, the vehicle body structure described in Patent Document 1 transmits a collision load to the rear side frame via the load transmission member and also joins the load transmission member to the side sill and the floor panel. The transmission loss of the collision load is likely to increase.

  For this reason, the vehicle body structure described in Patent Document 1 has a problem that the collision load is not efficiently transmitted to the rear side frame. Furthermore, since the load transmitting member is disposed in the vehicle interior, there is a problem that the space in the vehicle interior is pressed and the degree of freedom in designing the vehicle interior is reduced.

JP 2010-173473 A

  In view of the above-described problems, the present invention provides a lower vehicle body structure for a vehicle that can more effectively transmit and disperse a collision load from the side of the vehicle to the lower part of the vehicle body and suppress the entry of the side door into the vehicle interior. The purpose is to provide.

The present invention includes a pair of left and right side sills extending in the vehicle front-rear direction of a vehicle at a lower portion of the vehicle body, a pair of left and right rear wheel houses connected to a rear end of the side sill and bulging in the vehicle width direction, and the pair of left and right side sills A pair of left and right rear side frames that are disposed on the lower surface of the floor panel and are located on the inner side in the vehicle width direction with respect to the side sill and extending rearward of the vehicle, and the pair of left and right rear side frames. A lower body structure of a vehicle having a first cross member and a second cross member that are connected in a direction, and is mounted on an openable / closable side door disposed in front of the rear wheel house so as to close the side door. The rear end of the side sill is located near the rear end of the side sill, and the rear end of the load transmission member faces in the vehicle width direction. Both include a reinforcing member that forms a cross-section in the vehicle width direction with the side sill in a closed cross-sectional shape, and connects and fixes the rear wheel house and the side sill, and the first cross member is connected to the vehicle by the reinforcing member. It is arranged in the front, the second cross member is arranged in the rear of the vehicle with respect to the reinforcing member, and the rear side frame is moved from the substantially same position as the positions of the first cross member and the second cross member in the vehicle front-rear direction. A bulging portion that bulges outward in the width direction and that contacts the side sill is formed at approximately the same position as the reinforcing member in the vehicle longitudinal direction.
The load transmission member may be an impact bar, a door beam, or the like.

According to the present invention, the lower body structure of the vehicle can more efficiently transmit and disperse the collision load from the side of the vehicle to the lower part of the vehicle body, thereby suppressing the side door from entering the vehicle interior.
Specifically, the load transmitting member and the reinforcing member allow the load transmitting member to receive a collision load applied to the side door from the side of the vehicle and transmit it to the reinforcing member from the rear end of the load transmitting member.

  The side sill and the bulging portion of the rear side frame come into contact with each other at substantially the same position as the reinforcing member in the vehicle longitudinal direction, that is, the reinforcing member and the side sill and the swelled portion of the rear side frame in the vehicle width direction. Since the positions are arranged substantially on the same line, the lower body structure of the vehicle can linearly transmit the collision load applied to the reinforcing member to the bulging portion of the rear side frame along the collision direction.

  Further, by forming a bulging portion from the substantially same position as the position of the first cross member and the second cross member in the vehicle front-rear direction toward the outside in the vehicle width direction, the contact position between the side sill and the bulging portion, The rear side frame can be arranged on a straight line connecting the first cross member and on a straight line connecting the contact position between the side sill and the bulging portion and the second cross member.

  In other words, the collision load transmission path from the side sill to the first cross member and the collision load transmission path from the side sill to the second cross member can be configured linearly on the bulging portion of the rear side frame. In addition, since the bulging portion is formed on the rear side frame, it is possible to suppress a decrease in the transmission efficiency of the collision load from the side sill to the first cross member and the second cross member.

  For this reason, the rear side frame can efficiently distribute the collision load transmitted to the side sill to the first cross member and the second cross member and efficiently transmit the collision load. As a result, the lower vehicle body structure of the vehicle can efficiently transmit and distribute the collision load from the reinforcing member to the first cross member and the second cross member.

  Further, the side sill can disperse the collision load along the longitudinal direction of the vehicle, and can also transmit the collision load to the floor panel and disperse it. That is, the lower vehicle body structure of the vehicle can constitute a plurality of transmission paths for transmitting the collision load, and can efficiently transmit and distribute the collision load applied to the load transmission member to the lower part of the vehicle body.

In addition, since the lower body structure of the vehicle does not compress the space in the vehicle interior, there is no possibility that the degree of freedom in designing the vehicle interior will be reduced.
Therefore, the lower vehicle body structure of the vehicle can more efficiently transmit and disperse the collision load from the side of the vehicle to the lower part of the vehicle body, thereby suppressing the entry of the side door into the vehicle interior.

  As an aspect of the present invention, the side sill is configured integrally with a side sill outer disposed on the outer side in the vehicle width direction and a side sill inner that is disposed on the inner side in the vehicle width direction with respect to the side sill outer and connects the floor panel. In the cross section in the vehicle width direction, the side sill inner may be formed in such a shape that an outer edge in the vehicle width direction on the upper surface of the side sill inner faces an inner edge in the vehicle width direction on the upper surface of the reinforcing member in the vehicle width direction. it can.

According to the present invention, the collision load applied to the load transmission member can be transmitted and distributed to the rear side frame and the floor panel more efficiently.
Specifically, the floor panel is connected to the side sill inner, and the bulging portion of the rear side frame is in contact with the side sill inner. Then, the outer side edge in the vehicle width direction on the upper surface of the side sill is opposed to the inner edge in the vehicle width direction on the upper surface of the reinforcing member, that is, in the collision direction, so that the collision load from the side of the vehicle can be more efficiently removed from the reinforcing member. Can be transmitted to the side sill inner.

Thereby, the collision load applied to the reinforcing member can be transmitted and distributed to the floor panel and the rear side frame more efficiently.
Therefore, the lower body structure of the vehicle can more efficiently transmit and distribute the collision load applied to the reinforcing member to the first cross member, the second cross member, and the floor panel.

  Further, as an aspect of the present invention, in a bottom view, a virtual line connecting a contact portion where the bulging portion and the side sill abut and an end portion in the vehicle width direction of the first cross member is defined as a first virtual line. The imaginary line connecting the abutting portion and the end of the second cross member in the vehicle width direction is a second imaginary line, and the expansion in a range surrounded by the first imaginary line and the second imaginary line An opening having a predetermined size can be provided at the bottom of the protruding portion.

The opening of the predetermined size is an opening of a size that affects the transmission of the collision load to the first cross member and the second cross member, for example, a bracket that supports the suspension suspension member, The opening may be a size that can be installed inside the rear side frame.
The opening can be formed by punching out the bottom of the bulging portion, or by projecting the bottom of the bulging portion toward the top of the vehicle.

According to the present invention, it is possible to prevent the transmission path for transmitting the collision load from the contact portion to the first cross member and the second cross member from being interrupted.
Specifically, the first imaginary line and the second imaginary line can be linear transmission paths that can most effectively transmit the collision load from the contact portion to the first cross member and the second cross member. .

  For this reason, by providing an opening at the bottom of the bulging portion in the range surrounded by the first imaginary line and the second imaginary line, the linear transmission path for transmitting the collision load is prevented from being interrupted by the opening. it can. As a result, the lower vehicle body structure of the vehicle can transmit the collision load linearly from the contact portion to the first cross member and the second cross member even if the opening is provided in the bulging portion of the rear side frame.

Further, the rear side frame between the first cross member and the second cross member can be used not only for transmitting the collision load but also for disposing the support member for the suspension suspension member.
Therefore, even if the lower body structure of the vehicle forms an opening of a predetermined size, the collision load can be reliably transmitted and distributed to the first cross member and the second cross member.

  Further, as an aspect of the present invention, the first cross member and the second cross member are arranged at positions spaced apart from each other at substantially equal intervals in the vehicle longitudinal direction from the position of the reinforcing member in the vehicle longitudinal direction. it can.

  According to the present invention, it is possible to transmit the collision load to the first cross member and the second cross member in a substantially uniform manner. For this reason, it is possible to prevent the collision load from being biased to either the first cross member or the second cross member.

  Therefore, the lower body structure of the vehicle is arranged such that the collision load is smoothed by disposing the first cross member and the second cross member at substantially equal intervals with respect to the position of the reinforcing member in the vehicle longitudinal direction. It can be efficiently transmitted and distributed to the lower part of the vehicle body.

  Further, as a mode of the present invention, a restriction member that protrudes inward in the vehicle width direction is provided at the rear end of the load transmitting member, and the restriction member is allowed to be inserted into the reinforcing member when the side door is closed. A hole can be formed.

According to the present invention, the collision load applied to the load transmitting member can be more reliably transmitted to the reinforcing member.
Specifically, when it becomes impossible to receive a collision load applied from the side of the vehicle, the load transmission member starts to deform so as to bend toward the vehicle interior. At this time, the rear end of the load transmitting member moves forward of the vehicle by the contact of the regulating member with the regulating hole and the front side of the vehicle with respect to the rear end of the load transmitting member about to move forward of the vehicle. Can be regulated.

  For this reason, it is possible to prevent the contact between the reinforcing member and the rear end of the load transmitting member from being released. As a result, the load transmitting member can continuously transmit the collision load to the reinforcing member regardless of the collision state. Furthermore, the deformation of the load transmitting member in the vehicle interior direction can be suppressed.

  Therefore, the lower body structure of the vehicle can suppress the intrusion of the side door into the vehicle interior by more reliably and continuously transmitting the collision load applied to the load transmitting member to the reinforcing member.

  According to the present invention, it is possible to provide a lower vehicle body structure of a vehicle that can more efficiently transmit and disperse a collision load from the side of the vehicle to the lower part of the vehicle body and suppress the entry of the side door into the vehicle interior.

The bottom view which shows the vehicle rear external appearance in the lower vehicle body structure of a vehicle by a bottom view. The right view which shows the vehicle rear appearance in the lower vehicle body structure of a vehicle by right view. AA arrow sectional drawing in FIG. The external appearance perspective view which shows the external appearance of a reinforcement member. The vehicle right view which shows the vehicle rear appearance in a vehicle by right view.

An embodiment of the present invention will be described below with reference to the drawings.
1 shows a bottom view of the vehicle rear appearance of the lower vehicle body structure 2 of the vehicle 1, FIG. 2 shows a right side view of the vehicle rear appearance of the lower vehicle body structure 2 of the vehicle 1, and FIG. 4 is a cross-sectional view taken along arrow AA, FIG. 4 is an external perspective view showing the external appearance of the reinforcing member 30, and FIG.

1 and 2, detailed illustrations of the suspension suspension members such as the side door 3 and the lower arm are omitted, and the impact bar 4 is indicated by a two-dot chain line.
In the drawing, arrows Fr and Rr indicate the vehicle front-rear direction, arrow Fr indicates the vehicle front, and arrow Rr indicates the vehicle rear. Furthermore, arrows Rh and Lh indicate the vehicle width direction, arrow Rh indicates the vehicle right direction, and arrow Lh indicates the vehicle left direction. In addition, the arrow IN indicates the vehicle width direction inner side (vehicle interior direction), and the arrow OUT indicates the vehicle width direction outer side.

  First, as shown in FIGS. 1 and 2, the lower vehicle body structure 2 at the rear of the vehicle 1 includes a pair of left and right side sills 10 extending in the vehicle front-rear direction at the lower portion of the vehicle body and a pair of left and right side sills 10 connected to the rear ends of the side sills 10. The rear wheel house 20, the reinforcing member 30 disposed at the connecting portion between the side sill 10 and the rear wheel house 20, the floor panel 40 that connects the pair of left and right side sills 10, and the inner side in the vehicle width direction from the side sill 10. The vehicle includes a pair of left and right rear side frames 50 extending rearward of the vehicle, a front cross member 60 and a rear cross member 70 that connect the rear side frames 50 in the vehicle width direction.

  As shown in FIG. 3, the side sill 10 includes a side sill outer 10a disposed on the outer side in the vehicle width direction and a side sill inner 10b disposed on the inner side in the vehicle width direction with respect to the side sill outer 10a. .

  The side sill outer 10a has a substantially cross-sectional hat shape in which the cross-sectional shape in the vehicle width direction protrudes outward in the vehicle width direction, and the vehicle is seen from the outer upper flange portion 11a disposed substantially vertically and the lower end of the outer upper flange portion 11a. An outer upper surface portion 12a extending outward in the width direction, an outer side surface portion 13a extending from the outer edge of the outer upper surface portion 12a in the vehicle width direction, and extending inward in the vehicle width direction from the lower end of the outer side surface portion 13a. The outer bottom surface portion 14a provided and the outer lower flange portion 15a suspended from the inner edge in the vehicle width direction of the outer bottom surface portion 14a are integrally formed.

  The side sill inner 10b has a substantially cross-sectional hat shape in which the cross-sectional shape in the vehicle width direction protrudes inward in the vehicle width direction, and abuts the upper portion of the outer upper flange portion 11a in the vehicle width direction, and the lower end is a reinforcement described later Inner upper flange portion 11b substantially at the same position as the upper surface of member 30, inner upper surface portion 12b extending from the lower end of inner upper flange portion 11b toward the inner side in the vehicle width direction, and inner side in the vehicle width direction of inner upper surface portion 12b An inner side surface portion 13b extending substantially downward from the edge, an inner bottom surface portion 14b extending outward in the vehicle width direction from the lower end of the inner side surface portion 13b, and extending downward from an outer edge in the vehicle width direction of the inner bottom surface portion 14b. In addition, the inner lower flange portion 15b that contacts the outer lower flange portion 15a is integrally formed.

  The side sill outer 10a and the side sill inner 10b are brought into contact with each other in the vehicle width direction to join the outer upper flange portion 11a and the inner upper flange portion 11b, and the outer lower flange portion 15a and the inner lower flange portion 15b. Thus, the cross-sectional shape in the vehicle width direction constitutes the side sill 10 having a closed cross-sectional shape.

As shown in FIGS. 1 and 2, the rear wheel house 20 is formed in a substantially arch shape that protrudes upward in the vehicle in a side view, and is formed in a shape that bulges outward in the vehicle width direction.
As shown in FIG. 2, the reinforcing member 30 is a substantially trapezoidal member whose side view is laid on the front side of the vehicle, and as shown in FIGS. 3 and 4, the inner side in the vehicle width direction and the rear side of the vehicle are It is formed in a substantially box shape with an opening, and is disposed so as to reinforce the connection between the rear wheel house 20 and the side sill 10.

  Specifically, as shown in FIG. 3 and FIG. 4, the reinforcing member 30 has a substantially trapezoidal shape in a side view arranged substantially vertically with a predetermined interval on the outer side in the vehicle width direction with respect to the outer upper flange portion 11a. The side surface portion 31, the upper surface portion 32 extending from the upper end of the side surface portion 31 toward the inside in the vehicle width direction, the lower surface portion 33 extending from the lower end of the side surface portion 31 toward the inside in the vehicle width direction, and the side surface portion 31. And a front portion 34 extending from the front end toward the inside in the vehicle width direction.

  Further, as shown in FIG. 4, two flange portions 35 that are joined to the outer upper flange portion 11 a are integrally formed on the inner end side in the vehicle width direction of the upper surface portion 32. In addition, a flange portion 36 that is joined to the front end of the rear wheel house 20 is integrally formed at the vehicle rear end portion of the upper surface portion 32 and the side surface portion 31, and an outer portion of the lower surface portion 33 is disposed at the inner end portion in the vehicle width direction. A flange portion 37 to be joined to the side surface portion 13a is integrally formed.

The reinforcing member 30 is formed such that the inner edge of the upper surface portion 32 in the vehicle width direction is substantially in the same position as the outer edge of the inner upper surface portion 12b in the vehicle width direction.
Further, as shown in FIGS. 2 to 4, a locking hole portion 38 having a predetermined size is formed in the side surface portion 31 of the reinforcing member 30.

As shown in FIG. 3, the locking hole 38 is formed to open to a size that allows the locking pin 5 provided on the side door 3 disposed in front of the rear wheel house 20 to be inserted.
Specifically, as shown in FIG. 5, the side door 3 is attached in front of the rear wheel house 20 so as to be openable and closable for raising and lowering a passenger. As shown in FIG. 3, the side door 3 is configured by integrally forming an outer panel 3a disposed on the outer side in the vehicle width direction and an inner panel 3b disposed on the inner side in the vehicle width direction with respect to the outer panel 3a. Yes.

  Inside the side door 3 formed by the outer panel 3a and the inner panel 3b, an impact bar that extends in the vehicle front-rear direction and whose rear end faces the reinforcing member 30 in the vehicle width direction when the side door 3 is closed. 4 is provided on the inner panel 3b. The locking pin 5 protrudes inward in the vehicle width direction and is attached to the rear end of the impact bar 4 via the inner panel 3b.

A locking hole portion 38 of the reinforcing member 30 is formed so that such a locking pin 5 can be inserted when the side door 3 is closed.
The reinforcing member 30 joins the plurality of flange portions 35, 36, and 37 to the side sill outer 10a and the rear wheel house 20, and closes the cross section in the vehicle width direction with the outer upper flange portion 11a and the outer upper surface portion 12a. It is formed in a cross-sectional shape.

  As shown in FIG. 3, the floor panel 40 forms a substantially plate-like member in a three-dimensional shape and is joined to the inner upper surface portion 12 b of the side sill inner 10 b to constitute the floor surface of the passenger compartment in the vehicle 1. .

  The front cross member 60 and the rear cross member 70 have a substantially cross-sectional hat shape (not shown) in which the cross-sectional shape in the vehicle front-rear direction protrudes downward, and as shown in FIG. It arrange | positions via the equal space | interval from the center position of the part 38 to the vehicle forward and vehicle rear. The front cross member 60 and the rear cross member 70 form a cross section in the vehicle front-rear direction in a closed cross-sectional shape (not shown) with the floor panel 40, respectively.

  The rear side frame 50 has a substantially cross-sectional hat shape that protrudes downward in the cross-sectional shape in the vehicle width direction, and as shown in FIG. 1, the front end is connected to the rear end of the floor frame 6 that extends rearward from the front of the vehicle. It extends rearward and is disposed on the lower surface of the floor panel 40. The rear side frame 50 forms a cross section in the vehicle width direction with the floor panel 40 in a closed cross section (not shown).

  Further, as shown in FIG. 1, a bulging portion 51 bulging outward in the vehicle width direction is formed in the rear side frame 50 between the front cross member 60 and the rear cross member 70 in the vehicle front-rear direction. Yes.

  More specifically, first, in a bottom view, the inner side surface portion 13b of the side sill inner 10b on the central axis C of the locking hole portion 38 and the end portion of the central shaft extending in the vehicle width direction of the front cross member 60 are connected. Is a first virtual line PL1, and a virtual line connecting the end of the central axis extending in the vehicle width direction of the rear cross member 70 is a second virtual line PL2.

  The bulging portion 51 is formed between the front cross member 60 and the rear cross member 70 in the bottom view, and the bottom 51a is formed on the first virtual line PL1 and the second virtual line PL2. Further, the rear side frame 50 bulges outward in the vehicle width direction from substantially the same position as the positions of the front cross member 60 and the rear cross member 70 in the vehicle front-rear direction, and is substantially the same as the position of the reinforcing member 30 in the vehicle front-rear direction. It forms in the shape contact | abutted with the inner side part 13b in a position. A portion where the inner side surface portion 13 b and the bulging portion 51 are in contact with each other is referred to as a contact portion 52.

  In addition, the bottom 51a of the bulging portion 51, in other words, the bottom 51a of the rear side frame 50 between the front and rear cross members 60 and the rear cross member 70 in the vehicle front-rear direction, has a predetermined size at a predetermined position. An opening 53 is formed.

  More specifically, an opening 53 having a substantially octagonal shape in a bottom view is formed in a range surrounded by the first virtual line PL1 and the second virtual line PL2 at the bottom 51a of the rear side frame 50. In other words, the opening 53 is formed so as not to be positioned on the first virtual line PL1 and the second virtual line PL2. The opening 53 is formed in such a size that a support member 8 that supports a trailing link 7 described later can be inserted.

  As shown in FIG. 3, an opening bottom 54 that is bonded and fixed to the inner side surface 13 b of the side sill 10 and the inner side surface of the rear side frame 50 is provided inside the opening 53 in the rear side frame 50.

  The bottom 54 of the opening forms a bottom protrusion 54a that protrudes in a substantially convex shape toward the upper side of the vehicle at the approximate center in the bottom view, and two fixing bolts 55 are fixed to both ends of the bottom protrusion 54a in the vehicle width direction. ing.

  As shown in FIG. 1, the support member 8 that supports the front end of the trailing link 7 that is one of the suspension suspension members is fixed to the opening bottom portion 54 by the fixing bolt 55. The trailing end of the trailing link 7 is connected to a knuckle 9 that supports the wheels.

Next, transmission of a collision load applied from the side of the vehicle 1 in the lower body structure 2 of the vehicle 1 will be described in detail.
First, a collision load is applied to the side door 3 in the collision direction F shown in FIG. 1 by a side collision in which another vehicle collides with the side of the vehicle 1 or a side collision of the vehicle 1 with an obstacle. The impact bar 4 receives the collision load and transmits the collision load from the rear end to the reinforcing member 30.

  At this time, when the impact bar 4 is deformed in the vehicle interior direction due to the collision load, the locking pin 5 connected to the rear end of the impact bar 4 comes into contact with the locking hole 38 of the reinforcing member 30 in front of the vehicle. For this reason, the rear end of the impact bar 4 is restricted from moving forward of the vehicle. That is, the rear end of the side door 3 is restricted from moving forward by the locking pin 5 and the locking hole 38.

  The reinforcing member 30 to which the collision load is applied transmits and distributes the collision load to the floor panel 40, the rear side frame 50, the front cross member 60, and the rear cross member 70 through the side sill 10.

  More specifically, the reinforcing member 30 transmits and distributes a collision load to the floor panel 40 via the side sill 10. Further, the reinforcing member 30 directly transmits the collision load to the bulging portion 51 of the rear side frame 50 that is in contact with the side sill 10 at the contact portion 52.

  The rear side frame 50 transmits and disperses the collision load to the front cross member 60 and the rear cross member 70 along the first virtual line PL1 and the second virtual line PL2.

  The lower vehicle body structure 2 of the vehicle 1 configured as described above can more efficiently transmit and disperse the collision load from the side of the vehicle to the lower portion of the vehicle body, thereby suppressing the side door 3 from entering the vehicle interior. .

  Specifically, the impact bar 4 receives the collision load applied to the side door 3 from the side of the vehicle by the impact bar 4 and the reinforcing member 30, and transmits it to the reinforcing member 30 from the rear end of the impact bar 4. it can.

  The side sill 10 and the bulging portion 51 of the rear side frame 50 abut at substantially the same position as the reinforcing member 30 in the vehicle front-rear direction, that is, the reinforcing member 30 and the abutting portion 52 are substantially the same in the vehicle width direction. The lower body structure 2 of the vehicle 1 can linearly transmit the collision load applied to the reinforcing member 30 to the bulging portion 51 of the rear side frame 50 along the collision direction F. it can.

  Furthermore, the first virtual line PL1 and the second virtual line 51 are formed by forming the bulging portion 51 from the substantially same position as the positions of the front cross member 60 and the rear cross member 70 in the vehicle front-rear direction toward the outside in the vehicle width direction. The bottom 51a of the rear side frame 50 can be disposed on the line PL2.

  That is, a collision load transmission path from the side sill 10 to the front cross member 60 and a collision load transmission path from the side sill 10 to the rear cross member 70 are linearly formed on the bulging portion 51 of the rear side frame 50. be able to. In addition, since the bulging portion 51 is formed in the rear side frame 50, it is possible to suppress a reduction in the transmission efficiency of the collision load from the side sill 10 to the front cross member 60 and the rear cross member 70.

  Therefore, the rear side frame 50 can reliably distribute the collision load transmitted to the side sill 10 to the front cross member 60 and the rear cross member 70 and efficiently transmit the collision load. Thereby, the lower vehicle body structure 2 of the vehicle 1 can efficiently transmit and distribute the collision load from the reinforcing member 30 to the front cross member 60 and the rear cross member 70.

  Further, the side sill 10 can disperse the collision load along the vehicle front-rear direction, and can also transmit and disperse the collision load to the floor panel 40. That is, the lower vehicle body structure 2 of the vehicle 1 forms a plurality of transmission paths for transmitting the collision load, and can efficiently transmit and distribute the collision load applied to the impact bar 4 to the lower portion of the vehicle body.

In addition, since the lower body structure 2 of the vehicle 1 does not compress the space in the vehicle interior, there is no possibility that the degree of freedom in designing the vehicle interior will be reduced.
Therefore, the lower vehicle body structure 2 of the vehicle 1 can more efficiently transmit and disperse the collision load from the side of the vehicle to the lower portion of the vehicle body, thereby suppressing the side door 3 from entering the vehicle interior.

  Further, the collision load applied to the impact bar 4 by the vehicle width direction outer side edge of the inner upper surface portion 12b of the side sill inner 10b and the vehicle width direction inner side edge of the upper surface portion 32 of the reinforcing member 30 facing each other in the vehicle width direction. Can be transmitted and distributed to the floor panel 40 and the rear side frame 50 more efficiently.

  Specifically, the floor panel 40 is joined to the side sill inner 10b, and the bulging portion 51 of the rear side frame 50 is in contact therewith. Then, the outer edge in the vehicle width direction of the inner upper surface portion 12b is opposed to the inner end portion in the vehicle width direction of the upper surface portion 32 of the reinforcing member 30, that is, in the collision direction F, so that the collision load from the side of the vehicle is reduced. It can transmit to the side sill inner 10b from the reinforcing member 30 more efficiently.

Thereby, the collision load applied to the reinforcing member 30 can be transmitted and distributed to the floor panel 40 and the rear side frame 50 more efficiently.
Therefore, the lower body structure 2 of the vehicle 1 can transmit and disperse the collision load applied to the reinforcing member 30 to the front cross member 60, the rear cross member 70, and the rear side frame 50 more efficiently.

  Further, by forming the opening 53 in the range surrounded by the first virtual line PL1 and the second virtual line PL2 in the rear side frame 50, the front cross member 60 and the rear cross member 70 are contacted from the contact portion 52. It is possible to prevent the transmission path for transmitting the collision load from being interrupted.

  Specifically, the first imaginary line PL1 and the second imaginary line PL2 are linear transmission paths that can most effectively transmit the collision load from the contact portion 52 to the front cross member 60 and the rear cross member 70. can do. For this reason, by providing the opening 53 at the bottom 51a of the bulging portion 51 in the range surrounded by the first imaginary line PL1 and the second imaginary line PL2, the linear transmission path for transmitting the collision load is the opening. 53 can prevent interruption.

  Thereby, even if the lower body structure 2 of the vehicle 1 is provided with the opening 53 in the bulging portion 51 of the rear side frame 50, the collision load is linearly applied from the contact portion 52 to the front cross member 60 and the rear cross member 70. Can be transmitted.

  Further, the rear side frame 50 between the front cross member 60 and the rear cross member 70 can be used not only for transmitting a collision load but also for disposing the support member 8 that supports the suspension suspension member.

  Accordingly, the lower body structure 2 of the vehicle 1 can reliably transmit and distribute the collision load to the front cross member 60 and the rear cross member 70 even if the opening 53 having a predetermined size is formed.

  Further, since the front cross member 60 and the rear cross member 70 are arranged at substantially equal intervals from the center position of the locking hole portion 38 of the reinforcing member 30, a collision load is applied to the front cross member 60 and the rear cross member 70. It can be distributed almost uniformly. Thereby, it is possible to prevent the collision load from being biased to either the front cross member 60 or the rear cross member 70.

  Therefore, the lower vehicle body structure 2 of the vehicle 1 is arranged such that the front cross member 60 and the rear cross member 70 are arranged at substantially equal intervals with respect to the position of the reinforcing member 30 in the vehicle front-rear direction. Can be transmitted and distributed smoothly and efficiently to the lower part of the vehicle body.

  Further, by providing the locking pin 5 at the rear end of the impact bar 4 and the locking hole 38 in the reinforcing member 30, it is possible to more reliably transmit the collision load applied to the impact bar 4 to the reinforcing member 30. Can do.

  Specifically, when the impact load applied from the side of the vehicle cannot be received, the impact bar 4 starts to be deformed so as to bend toward the vehicle interior. At this time, the locking pin 5 comes into contact with the locking hole 38 on the front side of the vehicle with respect to the rear end of the impact bar 4 that is about to move forward, so that the rear end of the impact bar 4 moves forward. Can be controlled.

  For this reason, it is possible to prevent the contact between the reinforcing member 30 and the rear end of the impact bar 4 being released. Thereby, the impact bar 4 can continuously transmit the collision load to the reinforcing member 30 regardless of the progress state of the collision.

Furthermore, since the deformation of the impact bar 4 in the vehicle interior direction can be suppressed, the side door 3 can be prevented from entering the vehicle interior.
Therefore, the lower body structure 2 of the vehicle 1 can suppress the intrusion of the side door 3 into the vehicle interior by continuously transmitting the collision load applied to the impact bar 4 to the reinforcing member 30 more reliably. it can.

  In the above-described embodiment, the opening 53 is formed to attach the trailing ring 7 that is one of the suspension suspension members. However, the present invention is not limited to this, and other suspension suspension members may be attached. .

  Further, if the opening has a size that does not affect the transmission of the collision load, such as a drain hole or an opening for a tie-down belt, the bottom 51a of the rear side frame 50 on the first virtual line PL1 and the second virtual line PL2. You may form in.

Moreover, although the opening part 53 was punched and formed, it is not limited to this, You may form the opening part 53 by protrudingly projecting the bottom part 51a of the bulging part 51 toward the vehicle upper direction.
Moreover, the contact part 52 may be any of point contact, line contact, or surface contact with respect to the side sill inner 10b.
Moreover, although the bulging part 51 was formed in the gentle approximate mountain shape, you may form in a substantially trapezoid in bottom view, without limiting to this.

Further, the bulging portion 51 may be formed to bulge forward from the position of the front cross member 60 in the vehicle front-rear direction and from the rear to the vehicle width direction outer side from the position of the rear cross member 70 in the vehicle front-rear direction. More preferred.
Thereby, the bottom part 51a of the bulging part 51 can be more reliably formed on the first virtual line PL1 and the second virtual line PL2.

In correspondence between the configuration of the present invention and the above-described embodiment,
The first cross member of the present invention corresponds to the front cross member 60 of the embodiment,
Similarly,
The second cross member corresponds to the rear cross member 70,
The load transmission member corresponds to the impact bar 4,
The upper surface of the side sill inner corresponds to the inner upper surface portion 12b,
The upper surface of the reinforcing member corresponds to the upper surface portion 32,
The restricting member corresponds to the locking pin 5,
The restriction hole corresponds to the locking hole 38,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Vehicle 2 ... Lower body structure 3 ... Side door 4 ... Impact bar 5 ... Locking pin 10 ... Side sill 10a ... Side sill outer 10b ... Side sill inner 12b ... Inner upper surface part 20 ... Rear wheel house 30 ... Reinforcement member 32 ... Upper surface part 38 ... Locking hole 40 ... Floor panel 50 ... Rear side frame 51 ... Swelling 51a ... Bottom 52 ... Abutting part 53 ... Opening 60 ... Front cross member 70 ... Rear cross member PL1 ... First virtual line PL2 ... Second virtual line

Claims (5)

A pair of left and right side sills extending in the vehicle longitudinal direction of the vehicle at the bottom of the vehicle body,
A pair of left and right rear wheel houses connected to the rear end of the side sill and bulging in the vehicle width direction;
A floor panel connecting the pair of left and right side sills;
A pair of left and right rear side frames that are disposed on the lower surface of the floor panel on the inner side in the vehicle width direction with respect to the side sill and extend rearward of the vehicle,
A vehicle lower body structure comprising a first cross member and a second cross member that connect the pair of left and right rear side frames in the vehicle width direction,
A load transmitting member that is mounted on an openable / closable side door disposed in front of the vehicle of the rear wheel house, and whose rear end is located near the rear end of the side sill when the side door is closed;
A reinforcing member that opposes the rear end of the load transmission member in the vehicle width direction, and that forms a cross-section in the vehicle width direction with the side sill in a closed cross-sectional shape, and connects and fixes the rear wheel house and the side sill. Prepared,
The first cross member is arranged in front of the vehicle with respect to the reinforcing member,
The second cross member is arranged behind the reinforcing member in the vehicle,
In the rear side frame,
The side sill bulges outward in the vehicle width direction from substantially the same position as the positions of the first cross member and the second cross member in the vehicle front-rear direction, and at the same position as the position of the reinforcing member in the vehicle front-rear direction. The lower body structure of the vehicle which formed the bulging part which contact | abuts. The side sill,
Side sill outer placed on the outside in the vehicle width direction,
It is arranged on the inner side in the vehicle width direction with respect to the side sill outer, and is configured integrally with a side sill inner that connects the floor panel,
The side sill inner,
2. The vehicle according to claim 1, wherein, in a cross section in the vehicle width direction, an outer edge in the vehicle width direction on the upper surface of the side sill inner is formed in a shape facing the inner edge in the vehicle width direction on the upper surface of the reinforcing member in the vehicle width direction. Lower body structure. In a bottom view, a virtual line connecting a contact portion where the bulging portion and the side sill abut and an end in the vehicle width direction of the first cross member is defined as a first virtual line, and the contact portion and the first 2 A virtual line connecting the ends of the cross member in the vehicle width direction is defined as a second virtual line,
At the bottom of the bulging portion in the range surrounded by the first imaginary line and the second imaginary line,
The lower body structure of a vehicle according to claim 1 or 2, wherein an opening having a predetermined size is provided. The first cross member and the second cross member;
The vehicle lower body structure according to any one of claims 1 to 3, wherein the lower vehicle body structure according to any one of claims 1 to 3 is disposed at a position spaced apart at substantially equal intervals in the vehicle longitudinal direction from the position of the reinforcing member in the vehicle longitudinal direction. At the rear end of the load transmitting member,
A regulating member that protrudes inward in the vehicle width direction is provided.
In the reinforcing member,
The lower body structure of a vehicle according to any one of claims 1 to 4, wherein a restriction hole portion that allows insertion of the restriction member when the side door is closed is formed.

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