JP4581517B2 - Lower body structure of the vehicle - Google Patents

Description

  The present invention includes a pair of left and right rear frames behind a floor panel that extend in the vehicle front-rear direction at a predetermined interval in the vehicle width direction, and a vehicle auxiliary device such as an exhaust pipe is disposed between the pair of left and right rear frames. The present invention relates to a lower body structure of a vehicle.

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 position between the upper rear surface of the kick-up portion 101 and the front lower portion of the rear floor 102 is determined in the vehicle width direction. A rear cross member 103 extending to the rear is provided, and a fuel tank 104 is disposed behind the rear cross member 103, while a rear seat 105 is disposed above the rear floor 102.

  Here, the above-mentioned rear cross member 103 is a vehicle body rigidity member that ensures the vehicle body rigidity and protects the fuel tank 104 against a side collision. On the other hand, in order to improve the comfort of the rear seat occupant seated on the rear seat 105 under the condition that the rear overhang is kept constant, the kick-up portion 101 may be set backward to enlarge the interior of the vehicle. When the portion 101 is retracted, the rear cross member 103 and the fuel tank 104 interfere with each other. Therefore, in the conventional structure shown in FIG. 16, it is difficult to expand the passenger compartment and improve the comfort.

  By the way, Patent Document 1 discloses a structure in which a rear cross member is provided on a lower surface of a corner portion between an upper portion of a kick-up portion and a front portion of a rear floor, and a fuel tank is provided behind the rear cross member. Since it is substantially the same as the conventional structure shown in FIG. 16, there is a problem that it is difficult to expand the passenger compartment and improve the comfort.

  Further, Patent Document 2 discloses a structure in which a fuel tank is disposed in a kick-up portion. The upper portion of the fuel tank is substantially flush with the rear floor, and the front of the vehicle with respect to the kick-up portion. Therefore, even if the kick-up part is set backward, the fuel tank is located so that it swells toward the inside of the vehicle interior, making it difficult to expand the interior of the vehicle and improve comfort There was a point.

  Further, in Patent Document 3, a fuel tank is formed and processed along the shape of the back surface of the kick-up portion, and the fuel tank is provided along the back surface of the kick-up portion, and the front portion of the fuel tank and the back surface of the kick-up portion. The rear cross member is disposed so as to be positioned between the two.

Also in the structure described in Patent Document 3, when the kick-up portion is set backward, the rear cross member interferes with the fuel tank as in the conventional structure of FIG. There were problems that were difficult to achieve.
JP-A-5-50952 Japanese Utility Model Publication No. 5-71083 JP-A-5-155258

  In view of this, the present invention attaches a cross member that connects the front end portions of the pair of left and right rear frames in the vehicle width direction to the lower side of the floor panel so as to expand the interior of the vehicle and improve the comfort. If the member is simply mounted below the floor panel, there will be a problem with the serviceability of the vehicle auxiliary equipment. By mounting the cross member detachably below the floor panel, the vehicle interior can be expanded while ensuring the rigidity of the vehicle body. An object of the present invention is to provide a lower body structure of a vehicle that can achieve both serviceability of vehicle auxiliary equipment.

A lower body structure of a vehicle according to the present invention includes a floor panel and a rear frame extending rearwardly in a vehicle width direction with a pair of left and right behind the floor panel and extending in the front-rear direction of the vehicle. A lower body structure of a vehicle in which an auxiliary machine is disposed, wherein 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, and the cross member and the floor panel An exhaust pipe extending in the front-rear direction of the vehicle is disposed therebetween, and the vehicle accessory is set as the exhaust pipe, and the floor panel is stepped upward from the position where the cross member is disposed. A raised kick-up portion is formed, and 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 front portion of the floor, and the cross member is disposed immediately before the kick-up portion along the lower portion of the floor panel in front of the fuel tank. The floor frame extends in the vehicle front-rear direction along the floor panel by the mounting seats formed at the intermediate portion thereof so as to be detachably attached to the lower side of the floor panel. The fuel tank is detachably attached to the rear end portion, and is attached to the front end portion of the rear frame by attachment seats formed at both end portions. The lower surface portion of the fuel tank has a lowermost height of the floor panel. together it is extended to lower position than is, the cross member is also provided so as to extend further lower position than the bottom surface of the fuel tank It is.

  The above vehicle accessory may be set to an exhaust pipe extending in the front-rear direction of the vehicle, and the cross member is preferably disposed at the lower portion of the floor panel immediately before the kick-up portion.

  According to the above configuration, since the cross member is attached below the floor panel, the kick up portion can be set backward relative to the conventional structure in which the cross member is provided on the upper rear surface of the kick up portion. In addition, the above-mentioned cross member has a detachable structure in consideration of the serviceability of the vehicle auxiliary machine, so that the auxiliary machine serviceability can be ensured.

  In short, it is possible to achieve both of ensuring the rigidity of the vehicle body and ensuring the serviceability of the auxiliary equipment while expanding the passenger compartment.

  In addition, the cross member detachable structure can reliably service exhaust pipes that are particularly demanding of serviceability.

  Further, the cross member is disposed in front of the kick-up portion along the lower part of the floor panel in front of the fuel tank, and the cross member does not exist on the upper rear surface of the kick-up portion as in the prior art. The capacity of the vehicle body can be increased, and the rigidity of the vehicle body can be ensured by the cross member. That is, it is possible to achieve both of ensuring the rigidity of the vehicle body and increasing the capacity of the fuel tank.

  In one embodiment of the present invention, the 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 the fuel pipe is disposed between the exhaust pipe and the floor panel. A part of the 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 cross member is bolted up to the front end of the rear frame.
According to the above configuration, since the cross member is fastened to the rear frame as the vehicle body rigid member, the rigidity of both (the cross member and the rear frame) can be improved, and the serviceability of the auxiliary machine can be improved by the structure of attaching and detaching the cross member. Can be secured.

In one embodiment of the present invention, the cross member is bolted up to the floor panel.
According to the above configuration, since the cross member is fastened to the floor panel, the rigidity of both (the cross member and the floor panel) can be improved, and the serviceability of the auxiliary machine can be ensured by the mounting structure of the cross member. it can.

In one embodiment of the present invention, the cross member is bolted up to the tunnel portion of the floor panel.
According to the above configuration, since the cross member is fastened to the tunnel portion, the rigidity of both (the cross member and the tunnel portion) can be improved, and the serviceability of the auxiliary machine can be ensured by the attachment / detachment structure of the cross member. it can.

  In one embodiment of the present invention, the cross member is bolted up to a floor frame extending in the front-rear direction of the vehicle along the floor panel.

  According to the above configuration, since the cross member is fastened to the floor frame as the vehicle body rigid member, the rigidity of both (the cross member and the floor frame) can be improved, and the serviceability of the auxiliary machine can be improved by the structure of attaching and detaching the cross member. Can be secured.

In one embodiment of the present invention, the cross member is formed with a recess corresponding to the arrangement part of the vehicle auxiliary machine.
According to the above configuration, in addition to ensuring both the rigidity of the vehicle body and the serviceability of the auxiliary equipment, it is possible to facilitate the layout of the auxiliary equipment by forming the concave portion.

  According to the present invention, the cross member that connects the front end portions of the pair of left and right rear frames in the vehicle width direction is attached to the lower side of the floor panel so as to expand the interior of the vehicle and improve the comfortability. If it is simply installed below the floor panel, there will be a problem in the serviceability of the vehicle auxiliary machine.By attaching the cross member to the bottom of the floor panel so as to be detachable, the vehicle interior can be expanded while ensuring the rigidity of the vehicle body, There is an effect that it is possible to achieve both the serviceability of the vehicle auxiliary equipment.

Extending the width between the front ends of a pair of left and right rear frames in the vehicle width direction and connecting them with the aim of ensuring vehicle body rigidity and ensuring serviceability of vehicle auxiliary equipment while expanding the cabin A cross member is provided, and an exhaust pipe extending in the front-rear direction of the vehicle is disposed between the cross member and the floor panel, and the vehicle accessory is set in the exhaust pipe. A kick-up portion is formed, the rear of which is raised upward from the position where the cross member is disposed, and a rear floor extending rearward from the upper end is connected to the upper end of the kick-up portion. A fuel tank is disposed below the rear side of the kick-up part and below the front part of the rear floor, and the cross member is located immediately below the kick-up part along the lower part of the floor panel in front of the fuel tank. The cross member is detachably attached to the lower side of the floor panel by a mounting seat formed at an intermediate portion thereof, and is attached to the floor panel by mounting seats formed at both sides. And detachably attached to the rear end portion of the floor frame extending in the longitudinal direction of the vehicle, and detachably attached to the front end portion of the rear frame by attachment seats formed at both end portions . The lower surface portion is realized by a configuration in which the lower surface portion extends to a position lower than the lowermost surface height of the floor panel, and the cross member is provided to extend further to a lower position than the lower surface portion of the fuel tank . .

An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing the lower body structure, FIG. 2 is a plan view thereof, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 5 is a bottom view, and in FIGS. 1 to 5, a dash lower panel (dash panel) 1 for partitioning the engine room and the vehicle compartment in the front-rear direction is provided, and a lower rear end of the dash lower panel 1 is provided. The floor panel 2 extending substantially horizontally toward the rear is connected. The floor panel 2 forms a lower surface of the vehicle compartment, and a tunnel portion 3 that protrudes toward the vehicle interior and extends in the front-rear direction of the vehicle is integrally or integrally formed at the center of the floor panel 2.

  Further, side sills 4 and 4 (see FIGS. 2 and 5) 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 the middle of the rear 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 (so-called No. 2.5 cross members and body rigid members) are provided, and closed cross sections 8a and 9a extending in the vehicle width direction are formed between the floor panel 2 and the cross members 8 and 9. The cross members 8 and 9 improve the vehicle body rigidity.

  On the other hand, as shown in FIGS. 1 and 5, in the lower part of the floor panel 2, the vehicle body rigidity extends in the longitudinal direction of the vehicle along the floor panel 2 between the side sill 4 on the side and the tunnel 3 on the center. A pair of left and right floor frames 10, 10 are provided as members. The floor frame 10 is bonded and fixed to the lower surface of the floor panel 2, and a closed cross section 10 a extending in the front-rear direction of the vehicle 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 surfaces of both side portions 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 in FIG. 6, the rear end portion 10 a of the floor frame 10 having a closed cross-sectional structure that is joined to the lower surface of the floor panel 2 and extends in the vehicle front-rear direction along the floor panel 2. The front end portion 12a of the rear side frame 12 having a closed cross-sectional structure that is joined to the lower surface of the rear floor 6 and extends in the front-rear direction of the vehicle at a predetermined interval is offset in the vehicle width direction and overruns in the front-rear direction of the vehicle. It is configured to wrap.

  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, and between the rear cross member 14 and the floor panel 2. Has a closed cross section 14h.

  This rear cross member 14 rectifies the traveling wind x to the fuel tank 13, and the traveling wind flows into the complicated shape portion on the known rear side of the kick-up portion 5, resulting in the generation of vortex due to the turbulence of the traveling wind. The air deflector that prevents the air resistance from being adversely affected and the fuel tank guard part that protects the fuel tank 13 are also used. Here, as shown in FIG. 4, the lower surface portion 13 c of the fuel tank 13 extends to a lower position than the height of the lowermost surface of the floor panel 2 only by a distance L <b> 1. The rear cross member 14, which also serves as an air deflector and a fuel tank guard, is provided to extend to a position lower than the lower surface portion 13 c of the fuel tank 13 by a distance L 2. With this structure, the capacity of the fuel tank 13 can be increased. The fuel tank 13 is protected and the aerodynamic performance around the fuel tank 13 is improved.

  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. 6 to 8, the rear cross member 14 is the cross member. 14 for the purpose of improving the rigidity of the vehicle itself, and having a concavo-convex shape continuous in the vehicle width direction, 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 mounting seats 14f on the lower surface of the front end 12a of the rear side frame 12. These mounting seats 14a to 14f are formed with a corresponding number of mounting holes 15, 16, and 17, respectively.

  As shown in FIGS. 7 and 8, 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 portion 3, it is below the top deck surface of the rear cross member 14. A recessed recess 18 is formed, and an exhaust pipe 19 is disposed corresponding to the recess 18.

That is, the concave portion 18 described above is formed corresponding to the arrangement portion of the exhaust pipe 19 as a vehicle auxiliary machine in the rear cross member 14.
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 is formed in a substantially flat shape having 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 line CC in FIG. 6, corresponding to the plurality of mounting holes 15, 15 of the rear cross member 14, on the upper surface of the floor panel 2 on the side of the tunnel portion 3. A plurality of nuts 20 and 20 are fixed by welding in advance, and bolts 21 as mounting members that are fastened and fixed to the nuts 20 from below are bolted up so that the mounting seats 14a, 14b, 14c, and 14d can be attached to and detached from the floor panel 2. It is concluded.

  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 bolted to the rear end portion 10a of the floor frame 10 by using bolts 23 as mounting members that are fastened and fixed to the nuts 22 from below. Yes.

  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 and 24 are fixed by welding, and a mounting seat 14f is detachably bolted to the front end portion 12a of the rear side frame 12 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. A plurality of bolts 21, 23, 25 (a total of 12 bolts in this embodiment) are fastened to the 12 front end portions 12 a by detachable bolt-up fastening.

  In addition, as shown in the cross-sectional view of FIG. 9, the front cross section of the above-described rear cross member 14 has a front, rear, and lower rectifying section 14g extending obliquely downward from the lower surface of the floor panel 2 to the rear. The rear cross member 14 also serves as an air deflector that rectifies the running air x to the fuel tank 13 by the rear cross member 14, and the rear cross member 14 has a fuel tank guard portion that protects the fuel tank 13. It is also configured to serve as both.

  By the way, as shown in FIGS. 5 and 13, the above-described exhaust pipe 19 extending in the front-rear direction of the vehicle is disposed below the rear floor 6 on the side of the above-described fuel tank 13, and the exhaust pipe 19 and the rear floor are arranged. A part of the fuel tank 13 is extended between the two and the fuel tank 13. 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 an exhaust manifold bolt 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 body structure of the vehicle according to the above embodiment includes the floor panel 2 and the rear side frame 12 extending in the front-rear direction of the vehicle while maintaining a predetermined distance in the vehicle width direction with a pair of left and right behind the floor panel 2. 12 is a vehicle lower body structure in which a vehicle accessory (see exhaust pipe 19) is disposed between a pair of rear side frames 12 and 12, and front end portions 12a and 12a of the pair of rear side frames 12 and 12 are provided. A rear cross member 14 that extends in the vehicle width direction and connects the two 12 is provided, and the rear cross member 14 is detachably disposed below the floor panel 2.

  According to this configuration, since the rear cross member 14 is disposed below the floor panel 2, the kick up portion 5 is set backward relative to the conventional structure in which the rear cross member is provided on the upper rear surface of the kick up portion 5. Thus, the interior of the vehicle compartment can be expanded and the comfort of the vehicle can be improved, and the rear cross member 14 has a detachable structure in consideration of the serviceability of the vehicle auxiliary equipment (see the exhaust pipe 19). Therefore, auxiliary serviceability can be ensured.

In short, it is possible to achieve both of ensuring the rigidity of the vehicle body and ensuring the serviceability of the auxiliary equipment while expanding the cabin and improving the comfort.
An exhaust pipe 19 extending in the front-rear direction of the vehicle is disposed between the rear cross member 14 and the floor panel 2, and the vehicle accessory is set in the exhaust pipe 19.

According to this configuration, since the rear cross member 14 is detachable, it is possible to reliably service the exhaust pipe 19 that is particularly demanding for service.
Furthermore, the floor panel 2 is formed with a kick-up portion 5 that is stepped upward from the rear cross member 14 and a fuel tank 13 is disposed below the kick-up 5. is there.

  According to this configuration, the rear cross member 14 is disposed below the floor panel 2 (specifically, below the floor panel 2 immediately before the kick-up portion 5). Therefore, the capacity of the fuel tank 13 can be increased, and the rigidity of the vehicle body can be secured by the rear cross member 14. That is, it is possible to achieve both of ensuring the rigidity of the vehicle body and increasing the capacity of the fuel tank 13.

  In addition, the exhaust pipe 19 extending in the front-rear 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). A portion of the fuel tank 13 is extended between the two (see 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. As shown in the embodiment, when the lower surface portion 13c of the fuel tank 13 is extended to a position lower than the bottom surface height of the floor panel 2 by a distance L1, the capacity of the fuel tank 13 can be further expanded. .

The rear cross member 14 is bolted up to the front end portion 12a of the rear side frame 12.
According to this configuration, since the rear cross member 14 is fastened to the rear side frame 12 having a closed cross-sectional structure as a vehicle body rigid member, the rigidity of both the rear cross member 14 and the rear side frame 12 can be improved. The support rigidity (coupling strength) of the member 14 can be secured, and the serviceability of the auxiliary machine (see the exhaust pipe 19) can be secured by the attachment / detachment structure of the rear cross member 14.

  Further, the rear cross member 14 is bolted to the floor panel 2.

  According to this configuration, since the rear cross member 14 is fastened to the floor panel 2, the rigidity of both (the rear cross member 14 and the floor panel 2) can be improved, and the support rigidity of the rear cross member 14 can be improved. The serviceability of the auxiliary machine (see the exhaust pipe 19) can be ensured by the detachable structure of the rear cross member 14.

In addition, the rear cross member 14 is bolted up to the tunnel portion 3 of the floor panel 2.
According to this configuration, since the rear cross member 14 is fastened to the tunnel portion 3 having high strength in the floor panel 2, the rigidity of the rear cross member 14 and the rear cross member 14 can be improved by improving the rigidity of the rear cross member 14 and the tunnel portion 3. The support rigidity (coupling strength) can be further improved, and the serviceability of the auxiliary machine (see the exhaust pipe 19) can be ensured by the detachable structure of the rear cross member 14.

Moreover, the rear cross member 14 is bolted up to the floor frame 10 extending in the front-rear direction of the vehicle along the floor panel 2.
According to this configuration, since the rear cross member 14 is fastened to the floor frame 10 having a closed cross-sectional structure as a vehicle body rigid member, both the rear cross member 14 and the floor frame 10 are improved in rigidity, and the rear cross member 14 The support rigidity can be further improved, and the serviceability of the auxiliary machine (see the exhaust pipe 19) can be ensured by the detachable structure of the rear cross member 14.

  Further, the rear cross member 14 is formed with a recess 18 corresponding to an arrangement part of a vehicle auxiliary machine (see the exhaust pipe 19).

  According to this configuration, in addition to ensuring the rigidity of the vehicle body and ensuring the serviceability of the auxiliary machine (see the exhaust pipe 19), the formation of the recess 18 allows the auxiliary machine (see the exhaust pipe 19) to be compatible. Easy layout can be achieved.

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 vehicle auxiliary machine corresponds to the exhaust pipe 19,
The cross member corresponds to the rear cross member 14 (so-called No. 3 cross member),
The floor panel on the side of the fuel tank corresponds to the rear floor 6,
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 3 ... Tunnel part 5 ... Kick-up part 6 ... Rear floor 10 ... Floor frame 12 ... Rear side frame (rear frame)
13 ... Fuel tank 14 ... Rear cross member (cross member)
18 ... Recess 19 ... Exhaust pipe (vehicle accessory)

Claims (7)

A rear panel that includes a floor panel and a rear frame that extends 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 vehicle auxiliary machine is disposed between a pair of rear frames,
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.
An exhaust pipe extending in the front-rear direction of the vehicle is disposed between the cross member and the floor panel,
The vehicle auxiliary machine is set in the exhaust pipe,
The floor panel is formed with a kick-up portion in which the rear is stepped upward from the location of the cross member,
A rear floor extending rearward from the upper end is connected to the upper end 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 cross member is disposed in front of the kick-up portion along the lower side of the floor panel in front of the fuel tank;
The cross member is detachably attached to the lower side of the floor panel by a mounting seat formed in an intermediate portion thereof,
The mounting seats formed on both sides are detachably attached to the rear end portion of the floor frame extending in the front-rear direction of the vehicle along the floor panel.
It is detachably attached to the front end of the rear frame by mounting seats formed at both ends .
The lower surface portion of the fuel tank extends to a position lower than the bottom surface height of the floor panel, and 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. The 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 the cross member is bolted up to a front end portion of the rear frame. The lower cross-body structure of a vehicle according to any one of claims 1 to 3, wherein the cross member is bolted up to a floor panel. 5. The vehicle lower body structure according to claim 4, wherein the cross member is bolted up to a tunnel portion of a floor panel. The lower body structure of a vehicle according to any one of claims 1 to 5, wherein the cross member is bolted up to the floor frame. The lower body structure of a vehicle according to any one of claims 1 to 6, wherein the cross member is formed with a recess corresponding to an arrangement portion of a vehicle auxiliary machine.

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