JP4581516B2 - Lower body structure of the vehicle - Google Patents

Description

  The present invention provides a vehicle in which a pair of left and right rear frames are provided with a rear frame extending in the front-rear direction of the vehicle at a predetermined interval in the vehicle width direction, and a fuel tank is disposed between the pair of left and right rear frames. It relates to the lower body structure.

Conventionally, the structure shown in FIG. 16 has been common as a lower body structure of a vehicle.
In other words, the rear floor 102 is connected to the floor panel 100 via a kick-up portion 101 whose rear side is raised upward, and the vehicle width is set between the upper rear surface of the kick-up portion 101 and the front lower portion of the rear floor 102. A rear cross member 103 extending in the direction is provided, a fuel tank 104 is provided behind the rear cross member 103, and a rear seat 105 is provided above the rear floor 102.

  As shown in FIG. 16, when the above-described fuel tank 104 is disposed on the back side of the kick-up portion 101 so as not to interfere with the rear cross member 103, a gap is formed between the kick-up portion 101 and the fuel tank 104. However, since the shape becomes complicated, there is a problem that when the traveling wind enters this portion, the traveling wind is disturbed, and the air resistance is adversely affected by the generation of the vortex.

  By the way, Patent Document 1 discloses a structure in which a rear cross member is provided on the upper rear surface of the kick-up portion and a fuel tank is disposed between a pair of left and right rear side frames behind the kick-up portion. Similar to the conventional structure, there is a problem that the traveling wind is disturbed and adversely affects the air resistance.

Patent Document 2 discloses a fuel tank disposed in the kick-up portion, but does not disclose any technical idea that suggests an improvement in aerodynamic performance around the fuel tank.
Further, Patent Document 3 discloses that the fuel tank is processed along the back shape of the kick-up portion, and the fuel tank is provided along the back of the kick-up portion. Since the structure of the fuel tank is complicated, there is a problem that the feasibility is lowered, and this Patent Document 3 does not disclose anything that suggests an improvement in aerodynamic performance around the fuel tank.
JP-A-5-50952 Japanese Utility Model Publication No. 5-71083 JP-A-5-155258

Therefore, the present invention forms a kick-up portion raised upward on the floor panel, arranges a fuel tank below the kick-up portion, and lowers the tank lower surface portion from the lowermost surface height of the floor panel. The floor panel in front of the fuel tank is provided with an air deflector that rectifies the running air to the tank, thereby achieving both expansion of the fuel tank capacity and improvement of aerodynamic performance around the fuel tank. In addition, a cross member extending between the front end portions of the pair of rear frames in the vehicle width direction and attached to the front end portion and connecting the two is provided, and the cross member is connected to the fuel tank in the vehicle width direction. this to reduce the its full width across and is formed into a rectified shape by forming the air deflector at the cross member, reduction and assembling steps of the parts corresponding to the position It is possible to improve both the rigidity of the vehicle body and the aerodynamic performance. In addition, compared with the conventional structure where the cross member is located on the upper back of the kick-up part, the kick-up part is set backward. As a result, the interior of the passenger compartment can be expanded to improve comfort, and the fuel tank can be expanded forward, so that the capacity of the fuel tank can be increased . Furthermore, the cross member, disposed so as to extend to a lower position than the bottom surface of the fuel tank, the cross member, and an object thereof is to provide a lower vehicle body structure of a vehicle Ru also serves as a fuel tank guard portion.

A lower body structure of a vehicle according to the present invention includes a floor panel and a pair of left and right rear frames at the rear of the floor panel, and a rear frame extending in the vehicle front-rear direction while maintaining a predetermined interval in the vehicle width direction. A lower body structure of a vehicle in which a fuel tank is disposed on the floor panel, wherein the floor panel is formed with a kick-up portion whose rear is stepped upward, and the upper end portion of the kick-up portion is rearward from the upper end portion. A rear floor that extends toward the rear, and a fuel tank is disposed below the rear side of the kick-up portion and below the front portion of the rear floor, and the lower surface of the fuel tank is lower than the bottom surface height of the floor panel. extending lower, in front of the fuel tank of the floor panel, air deflector is provided to rectify the travel wind to the fuel tank, the vehicle both side portions of the rear floor Provided with the pair of rear frames so as to extend in the rear direction, between a front end portion of said rear frame, attached to the front end portion extends in the vehicle width direction, provided the cross member for connecting both said cross member The cross member is disposed in front of the fuel tank along the lower portion of the floor panel and immediately before the kick-up portion, and the cross member extends over the entire width corresponding to the position of the fuel tank in the vehicle width direction. is formed into a rectified shape to form the air deflector at the cross member, said air deflector formed at the cross member rectifies traveling wind against the gap between the kick-up portion and the fuel tank a rectifier shape, the cross member is provided so as to extend to a lower position than the bottom surface of the fuel tank also functions as a fuel tank guard portion And wherein the door.

According to the above configuration, it is possible to achieve both expansion of the capacity of the fuel tank and improvement of aerodynamic performance around the fuel tank.
In other words, when the fuel tank is disposed in the above-described kick-up portion, the shape becomes complicated due to the formation of a gap, and when the traveling wind enters this portion, the traveling wind is disturbed, and the air resistance is adversely affected by the generation of eddy currents. Since an air deflector that rectifies the traveling airflow to the fuel tank is provided in the front part of the kick-up part along the lower side of the floor panel in front of the fuel tank, the aerodynamic performance around the fuel tank is improved. be able to.

  In addition, since the lower surface of the fuel tank disposed below the rear side of the kick-up portion and the lower front portion of the rear floor is extended so as to be lower than the bottom surface height of the floor panel, the capacity of the fuel tank is increased. be able to.

  Further, a cross member extending in the vehicle width direction and connecting between the front end portions of the pair of rear frames is provided, the cross member is formed into a straightening shape, and the air deflector is formed by the cross member. It is.

  As described above, since the air deflector is constituted by the cross member, it is possible to reduce the number of parts and the assembly man-hours, and to achieve both improvement of the rigidity of the vehicle body and improvement of the aerodynamic performance.

  In addition, it is possible to set the kick-up part backward as compared with the conventional structure in which the cross member is present on the upper back surface of the kick-up part. In addition, since the fuel tank can be expanded forward, the capacity of the fuel tank can be increased.

  In one embodiment of the present invention, an exhaust pipe extending in the front-rear direction of the vehicle is disposed below the floor panel on the side of the fuel tank, and between the exhaust pipe and the floor panel, A part of the fuel tank is extended.

According to the above configuration, the capacity of the fuel tank can be further increased by the above-described partial extension structure of the fuel tank while ensuring the layout of the exhaust pipe.
In one embodiment of the present invention, the vehicle width direction intermediate portion of the cross member is connected to a rear end portion of a floor frame extending in the vehicle front-rear direction along the floor panel.

According to the above configuration, the connection structure between the cross member and the floor frame (both body rigid members) can improve the rigidity of the floor frame and the cross member by synergistic effects. It is possible to distribute the load at the time of collision and to improve the collision resistance.
In one embodiment of the present invention, the cross member is formed with a recess corresponding to the portion where the exhaust pipe is disposed.
According to the above configuration, in addition to ensuring the rigidity of the vehicle body and expanding the capacity of the fuel tank, the exhaust pipe layout can be facilitated by forming the recess.

  According to the present invention, the kick-up portion raised upward is formed on the floor panel, and the fuel tank is disposed below the rear side of the kick-up portion and below the front portion of the rear floor, and the tank lower surface portion. Since the floor panel in front of the fuel tank is provided with an air deflector that rectifies the wind flow to the tank, the capacity of the fuel tank is increased and the aerodynamic performance around the fuel tank There is an effect that it is possible to achieve both improvement.

  In addition, a cross member extending between the front end portions of the pair of rear frames in the vehicle width direction and connecting the two is provided, the cross member is formed into a straightening shape, and the air deflector is formed by the cross member. In addition, it is possible to reduce the number of parts and assembly man-hours, and there is an effect that it is possible to achieve both the improvement of the rigidity of the vehicle body and the improvement of the aerodynamic performance.

  Furthermore, compared to the conventional structure where the cross member is located on the upper rear surface of the kick-up part, the kick-up part can be set to move backward. In addition, since the fuel tank can be expanded forward, the capacity of the fuel tank can be increased.

The purpose of achieving both expansion of the fuel tank capacity and improvement of aerodynamic performance around the fuel tank is to maintain a predetermined distance in the vehicle width direction with a pair of left and right behind the floor panel and the front and rear direction of the vehicle. A bottom frame structure of the vehicle in which a fuel tank is disposed between the pair of rear frames, and the floor panel is formed with a kick-up portion whose rear is raised upward, A rear floor extending rearward from the upper end portion is connected to the upper end portion of the kick-up portion, a fuel tank is disposed below the rear side of the kick-up portion and below the front portion of the rear floor, and the fuel tank The lower surface portion of the floor panel extends below the lowermost surface height of the floor panel, and an air deflation that rectifies running air to the fuel tank is provided in front of the fuel tank of the floor panel. Motor is provided, along with provision of the pair of rear frames so as to extend the both side portions of the rear floor in the longitudinal direction of the vehicle, between the front end of the rear frame, attached to the front end portion extends in the vehicle width direction, provided cross member for connecting both said cross member along the lower side of the front of the floor panel of the fuel tank is arranged just before part of the kick-up portion, the cross member, the car of the fuel tank molded in correspondence with the widthwise position to the rectifying shape over its entire width to form the air deflector at the cross member, said air deflector formed at the cross member, the kick-up portion and the was formed a rectifier portion shaped to rectify the travel wind against the gap between the fuel tank, the cross member extends to a lower position than the bottom surface of the fuel tank Provided cormorants was realized by the configuration serving as a fuel tank guard portion.

An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing the vehicle body structure, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. 4 is an enlarged side view of the main part. FIGS. 5 and 5 are bottom views. In FIGS. 1 to 5, a dash lower panel (dash panel) 1 that partitions the engine room and the vehicle compartment in the front-rear direction is provided. A floor panel 2 extending substantially horizontally toward the rear is continuously provided, and a tunnel portion 3 protruding in the vehicle interior and extending in the front-rear direction of the vehicle is integrally or integrally formed at the center of the floor panel 2. Yes.

  Further, side sills 4 and 4 as vehicle body rigid members extending in the front-rear direction of the vehicle are joined and fixed to the left and right sides of the floor panel 2 described above. The side sill 4 is configured by joining a side sill inner, a side sill outer, and a side sill reinforcement, and has a side sill closed section extending in the front-rear direction of the vehicle.

  Further, the above-described floor panel 2 is formed with a kick-up portion 5 whose rear side is raised upward, and a rear floor 6 (which extends rearward from the upper end portion) is formed on the upper end portion of the kick-up portion 5. A part of the floor panel 2 is continuously provided, and a spare tire puncture 7 is provided in a substantially lower part of the rear floor 6 so as to be stepped downward.

Here, the above-described kick-up portion 5 is formed so as to save the foot space of the rear seat occupant.
By the way, as shown in FIGS. 1 to 3, a cross member (a so-called No. 2 cross) as a vehicle body rigid member that extends in the vehicle width direction to the left and right side sills 4 and 4 across the tunnel portion 3 is provided on the upper portion of the floor panel 2. Member) 8 and a pair of left and right sides that are orthogonal to the tunnel portion 3 and connect the tunnel portion 3 and the side sill 4 in the vehicle width direction at positions separated from the cross member 8 in the rear of the vehicle. Cross members 9 and 9 (a so-called No. 2.5 cross member, a rigid body member) are provided, and a closed cross section extending in the vehicle width direction is formed between the floor panel 2 and each cross member 8 and 9. .

  On the other hand, as shown in FIG. 5, in the lower part of the floor panel 2, there is a vehicle body rigid member extending in the front-rear direction of the vehicle along the floor panel 2 between the side sill 4 on the side and the tunnel 3 on the center. The left and right floor frames 10, 10 are provided. The floor frame 10 is bonded and fixed to the lower surface of the floor panel 2, and a closed cross section extending in the vehicle front-rear direction is formed between the floor panel 2 and the floor frame 10. The rear end of the floor frame 10 extends to the vicinity of the kick-up portion 5. Further, a front side frame 11 (front frame) as a vehicle body rigid member is continuously provided at the front end portion of the floor frame 10.

  Further, the rear floor 6 is provided with rear side frames 12 and 12 (rear frames) as vehicle body rigid members that extend in the vehicle front-rear direction while maintaining a predetermined distance in the vehicle width direction as a pair of left and right as shown in FIG. ing. The rear side frame 12 is joined and fixed to the lower surface of the rear floor 6, and a closed cross section extending in the front-rear direction of the vehicle is formed between the rear floor 6 and the rear side frame 12.

  As shown in FIG. 4, the fuel tank 13 is positioned below the rear side (rear) of the kick-up portion 5 and below the front portion of the rear floor 6 and between the pair of left and right rear side frames 12, 12. Is arranged.

  As shown in an enlarged plan view of FIG. 6, the main part is joined to the lower surface of the floor panel 2 and extends in the front-rear direction of the vehicle along the floor panel 2. The front end portion 12a of the rear side frame 12 joined to the lower surface and extending in the front-rear direction of the vehicle with a predetermined interval is configured to be offset in the vehicle width direction and overlap in the front-rear direction of the vehicle.

  A rear cross member 14 (No. 3 cross member) is provided as a vehicle body rigid member that extends between the front end portions 12a, 12a of the pair of left and right rear side frames 12, 12 in the vehicle width direction and connects the two 12, 12 to each other. 4 and 5, the rear cross member 14 is disposed below the floor panel 2 in front of the fuel tank 13 described above. Specifically, as shown in FIG. 4, the rear cross member 14 is disposed below the floor panel 2 immediately before the kick-up portion 5.

  The rear cross member 14 constitutes an air deflector that rectifies the traveling wind x to the fuel tank 13. Here, as shown in FIG. 4, the lower surface portion of the fuel tank 13 is extended to a lower position by a distance L1 than the height of the lowermost surface of the floor panel 2, and the rear cross member 14 constituting the air deflector is composed of the fuel tank. 13 is provided so as to extend to a position lower than the lower surface portion of the fuel tank 13 by a distance L2. With this structure, the capacity of the fuel tank 13 can be increased and the aerodynamic performance around the fuel tank 13 can be improved. ing. That is, the traveling wind x is configured so as not to enter the complex shape portion on the back side of the kick-up portion 5.

  7 is a perspective view of the rear cross member 14, and FIG. 8 is a cross-sectional view taken along the line BB in FIG. 7. As shown in FIGS. For the purpose of improving the rigidity of the member 14 itself, the member 14 is formed to have an uneven shape continuous in the vehicle width direction, and a pair of front and rear and left and right mounting seats 14a, 14b with respect to the lower surface of the floor panel 2 on the side of the tunnel 3 , 14c, 14d, a pair of front and rear and left and right mounting seats 14e on the lower surface of the rear end 10a of the floor frame 10, and a pair of front and rear and left and right mounting seats 14f on the lower surface of the front end 12a of the rear side frame 12. And mounting holes 15, 16, and 17 are formed in the mounting seats 14a to 14f, respectively.

  As shown in FIGS. 7 and 8, the space between the pair of left and right mounting seats 14a, 14b and 14c, 14d with respect to the lower surface of the floor panel 2 on the side of the tunnel 3 is below the top deck surface of the rear cross member 14. A concave portion 18 is formed in the hollow portion, and an exhaust pipe 19 is disposed corresponding to the concave portion 18.

That is, the above-described recess 18 is formed corresponding to the portion where the exhaust pipe 19 of the rear cross member 14 is disposed.
The mounting seat 14e on the lower surface of the rear end portion 10a of the floor frame 10 is formed at a low position recessed with respect to the top deck surface of the rear cross member 14, and between the left and right mounting seats 14e and 14e. The bottom deck of the rear cross member 14 has a substantially flat shape with no irregularities.

Further, the mounting seat 14 f for the lower surface of the front end portion 12 a of the rear side frame 12 is formed at a position slightly rearward with respect to the main portion of the rear cross member 14.
FIG. 9 is a cross-sectional view of a portion corresponding to the line CC in FIG. 6, corresponding to the plurality of mounting holes 15, 15 of the rear cross member 14, A plurality of nuts 20 and 20 are fixed by welding in advance, and the mounting seats 14a, 14b, 14c and 14d are detachably attached to the floor panel 2 using bolts 21 as attachment members which are fastened and fixed to the nuts 20 from below. .

  FIG. 10 is a cross-sectional view of a portion corresponding to the line DD in FIG. 6. A plurality of mounting holes 16 and 16 of the rear cross member 14 are provided in advance at the rear end portion 10 a of the floor frame 10. The nuts 22 and 22 are fixed by welding, and the mounting seat 14e is detachably attached to the rear end portion 10a of the floor frame 10 by using bolts 23 as attachment members that are fastened and fixed to the nuts 22 from below.

  FIG. 11 is a cross-sectional view of a portion corresponding to the line EE in FIG. 6, and a plurality of the front end portions 12 a of the rear side frame 12 correspond to the plurality of mounting holes 17, 17 of the rear cross member 14 in advance. The nuts 24, 24 are fixed by welding, and the mounting seat 14f is detachably attached to the front end portion 12a of the rear side frame 12 by using a bolt 25 as an attachment member that is fastened and fixed to the nut 24 from below.

  Thus, as shown in FIG. 12, the above-described rear cross member 14 includes the floor panel 2 on the side of the tunnel portion 3, the rear end portion 10a of the floor frame 10, and the rear side frame in consideration of maintainability. The twelve front end portions 12a are detachably attached using a plurality of bolts 21, 23, 25 (total of twelve bolts in this embodiment).

  Moreover, as shown in the sectional view of FIG. 9, the front cross section of the above-described rear cross member 14 has a front, rear, and lower rectifying portion 14g extending obliquely downward from the lower surface of the floor panel 2 to the rear. The rear cross member 14 forms an air deflector that rectifies the traveling wind x to the fuel tank 13, and the rear cross member 14 is a fuel tank that protects the fuel tank 13. It is comprised so that it may serve also as a guard part.

  As shown in FIGS. 5 and 13, an exhaust pipe 19 extending in the front-rear direction of the vehicle is disposed below the rear floor 6 on the side of the fuel tank 13. The exhaust pipe 19, the rear floor 6, A part of the fuel tank 13 is extended between the two. That is, as shown in FIGS. 13 and 14, the fuel tank 13 is extended so as to be positioned between the upper portion of the exhaust pipe 19 that is bent in a substantially L shape and the lower portion of the rear floor 6. The portion 13a is integrally formed, and the capacity of the fuel tank 13 is further increased by forming the extension portion 13a.

  Here, as shown in FIGS. 5 and 13, the downstream side of the exhaust pipe 19 is connected to the tail pipe 27 via the silencer 26, while the upstream side of the exhaust pipe 19 is shown in FIGS. As shown in FIG. 5, it is connected to the exhaust manifold bolts of the engine via catalystists 28 and 29 located on the vehicle exterior side of the tunnel portion 3.

  In FIG. 4, a recess 13b is formed in the upper portion of the fuel tank 13, and a recess 6b is also formed in the rear floor 6 correspondingly. As shown in FIG. 15, these recesses 13b, 6b are formed. May be omitted, and the capacity of the fuel tank 13 may be increased accordingly.

  Further, in FIG. 5, a lower tunnel member 30 is provided at an open lower end portion of the tunnel portion 3 corresponding to a cross member 8 (so-called No. 2 cross member). Further, a rear seat 31 is provided above the rear floor 6 close to the kick-up portion 5. In the figure, arrow F indicates the front of the vehicle, and arrow R indicates the rear of the vehicle.

  As described above, the lower vehicle body structure of the vehicle of the above embodiment includes the floor panel 2 and the rear side frames 12 and 12 extending in the front-rear direction of the vehicle with a pair of left and right behind the floor panel 2 maintaining a predetermined distance in the vehicle width direction. A vehicle body structure in which a fuel tank 13 is disposed between the pair of rear side frames 12 and 12. The floor panel 2 is formed with a kick-up portion 5 raised upward. The fuel tank 13 is disposed below the kick-up portion 5, and the lower surface portion of the fuel tank 13 extends below the bottom surface height of the floor panel 2 (see L1 in FIG. 4). In front of the second fuel tank 13, an air deflector (see the rear cross member 14) for rectifying the traveling wind x to the fuel tank 13 is provided.

According to this configuration, it is possible to achieve both expansion of the capacity of the fuel tank 13 and improvement of aerodynamic performance around the fuel tank 13.
That is, when the fuel tank 13 is disposed in the kick-up portion 5 described above, the shape becomes complicated due to the formation of a gap. When the traveling wind enters this portion, the traveling wind is disturbed, and the air resistance is adversely affected by the generation of eddy currents. However, since the above-described floor panel 2 in front of the fuel tank 13 is provided with an air deflector (see the rear cross member 14) that rectifies the traveling wind x to the fuel tank 13, the aerodynamic performance around the fuel tank 13 is improved. You can plan.

Further, since the lower surface portion of the fuel tank 13 disposed below the kick-up portion 5 is extended so as to be lower than the height of the lowermost surface of the floor panel 2 by the distance L1, the capacity of the fuel tank 13 can be increased. Can do.
Furthermore, a rear cross member 14 is provided between the front end portions of the pair of rear side frames 12 and 12 so as to extend in the vehicle width direction and connect the both 12 and 12, and the rear cross member 14 is formed into a rectifying shape. The air deflector is formed by the rear cross member 14.

According to this configuration, since the air deflector is configured by the rear cross member 14, it is possible to reduce the number of parts and assembly man-hours, and to achieve both the improvement of the rigidity of the vehicle body and the improvement of the aerodynamic performance. Can do.
In addition, compared with the conventional structure in which the rear cross member is located on the upper rear surface of the kick-up portion, the kick-up portion 5 can be set backward, so that the interior of the vehicle can be expanded and the comfort can be improved. In addition, the fuel tank 13 can be expanded forward, so that the capacity of the fuel tank 13 can be further increased.

  Further, the lower body structure of the vehicle of the above embodiment also includes a floor panel 2 and rear side frames 12 and 12 extending in the front-rear direction of the vehicle with a predetermined distance in the vehicle width direction with a pair of left and right behind the floor panel 2. A vehicle body structure in which a fuel tank 13 is disposed between the pair of rear side frames 12 and 12, the floor panel 2 is formed with a kick-up portion 5 raised upward, The fuel tank 13 is disposed below the kick-up portion 5, and the rear cross member 14 disposed below the floor panel 2 is formed into a rectifying shape to rectify the running air to the fuel tank 13. The air deflector to be formed is formed.

  According to this configuration, since the air deflector configured by the rear cross member 14 is provided below the floor panel 2, the air flow to the fuel tank 13 is rectified by the air deflector and the fuel tank 13 is rectified. The surrounding aerodynamic performance can be improved.

  In addition, since the rear cross member 14 is formed into a rectifying shape and an air deflector is formed using the rear cross member 14, the number of parts and assembly man-hours can be reduced, and the rear cross member 14 can be reduced. It is possible to secure the rigidity of the vehicle body.

  Moreover, the rear cross member 14 is located below the floor panel 12 and at a position where the running air x to the fuel tank 13 is rectified, that is, upstream of the fuel tank 13, so that the rear cross member is located above the kick-up portion. Compared to the conventional structure existing on the back side, the kick-up portion 5 can be set backward, so that the interior of the vehicle can be enlarged to improve the comfort and the fuel tank 13 can be moved forward. The capacity of the fuel tank 13 can be increased.

The rear cross member 14 extends between the front end portions of the pair of left and right rear side frames 12 and 12 in the vehicle width direction and connects the both 12 and 12.
According to this configuration, the rigidity of the vehicle body can be secured by the rear cross member 14, and the rigidity of the air deflector itself can be secured.

  Further, an exhaust pipe 19 extending in the longitudinal direction of the vehicle is disposed below the floor panel (see the rear floor 6) on the side of the fuel tank 13, and the exhaust pipe 19 and the floor panel (see the rear floor 6) are arranged. Between the two, a part of the fuel tank 13 is extended (refer to the extension 13a).

According to this configuration, the capacity of the fuel tank 13 can be further expanded by the above-described partial extension structure of the fuel tank 13 while ensuring the layout of the exhaust pipe 19.
Moreover, the intermediate portion in the vehicle width direction of the rear cross member 14 is connected to the rear end portion 10a of the floor frame 10 extending in the front-rear direction of the vehicle along the floor panel 2.

  According to this configuration, the connection structure between the rear cross member 14 and the floor frame 10 (both body rigid members) improves the rigidity of the floor frame 10 and the rigidity of the rear cross member 14 by a synergistic effect. In addition, it is possible to distribute the load at the time of a vehicle collision and to improve the collision resistance.

In addition, the rear cross member 14 is formed with a recess 18 corresponding to the portion where the exhaust pipe 19 is disposed.
According to this configuration, in addition to ensuring the rigidity of the vehicle body and expanding the capacity of the fuel tank 13, the exhaust pipe layout can be facilitated by forming the recess 18.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The rear frame of the present invention corresponds to the rear side frame 12 of the embodiment,
Similarly,
The air deflector corresponds to the rear cross member 14,
The cross member corresponds to the rear cross member 14,
The present invention is not limited to the configuration of the above-described embodiment.

The perspective view which shows the lower vehicle body structure of the vehicle of this invention. The top view of FIG. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. The principal part enlarged side view of FIG. The bottom view which shows the lower vehicle body structure of a vehicle. The top view of a rear cross member. The perspective view of a rear cross member. FIG. 8 is a cross-sectional view taken along line B-B in FIG. 7. Sectional drawing of the site | part corresponded to CC line of FIG. Sectional drawing of the site | part corresponded to the DD line | wire of FIG. Sectional drawing of the site | part corresponded to the EE line | wire of FIG. The enlarged side view of a rear cross member. The perspective view of an exhaust pipe and a fuel tank. The front view of a fuel tank. The side view which shows the other Example of the lower vehicle body structure of a vehicle. The side view which shows the lower vehicle body structure of the conventional vehicle.

2 ... Floor panel 5 ... Kick-up part 6 ... Rear floor 10 ... Floor frame 12 ... Rear side frame (rear frame)
13 ... Fuel tank 14 ... Rear cross member (air deflector)
14g ... Rectification part 18 ... Concave part 19 ... Exhaust pipe

Claims (4)

A floor panel, and a rear frame extending in the front-rear direction of the vehicle while maintaining a predetermined distance in the vehicle width direction in a pair of left and right behind the floor panel;
A vehicle lower body structure in which a fuel tank is disposed between the pair of rear frames,
The floor panel has a kick-up part with the rear raised upwards,
A rear floor extending rearward from the upper end portion is connected to the upper end portion of the kick-up portion. A fuel tank is disposed below the rear side of the kick-up portion and below the front portion of the rear floor. The lower surface of the tank extends below the bottom surface height of the floor panel,
In front of the fuel tank of the floor panel, an air deflector for rectifying the running air to the fuel tank is provided,
A pair of rear frames is provided so that both sides of the rear floor extend in the front-rear direction of the vehicle , and a cross between the front end portions of the rear frame is attached to the front end portion extending in the vehicle width direction and connecting the two. A member,
The cross member is disposed immediately before the kick-up portion along the lower side of the floor panel in front of the fuel tank,
The cross member, corresponding to the position of the vehicle width direction of the fuel tank is formed into a rectified shape over its entire width to form the air deflector at the cross member,
The air deflector formed by the cross member is a rectifying unit having a shape for rectifying running air with respect to a gap between the kick-up unit and the fuel tank ,
The cross member is provided to extend to a position lower than the lower surface portion of the fuel tank,
The lower body structure of the vehicle that also serves as the fuel tank guard . An exhaust pipe extending in the front-rear direction of the vehicle is disposed below the floor panel on the side of the fuel tank,
The lower body structure of a vehicle according to claim 1, wherein a part of the fuel tank is extended between the exhaust pipe and the floor panel. The vehicle lower body structure according to claim 1 or 2, wherein an intermediate portion in the vehicle width direction of the cross member is connected to a rear end portion of a floor frame extending in the vehicle front-rear direction along the floor panel. The lower body structure of a vehicle according to claim 2, wherein the cross member is formed with a concave portion corresponding to an arrangement portion of the exhaust pipe.

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