JP2008013078A - Under-body structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide under-body structure of a vehicle capable of securing capacity of a fuel tank and residential qualification of occupants in a body formed compact in the back and forth direction and restricted in height. <P>SOLUTION: A kick-up part 3 is structured of a first kick-up part 4 and a second kick-up part 5 arranged in parallel with the first kick-up part 4 in the car cross direction and formed higher than the first kick-up part 4. The fuel tank 48 is arranged under the second kick-up part 5, and a first occupant seat is arranged over the first kick-up part 4, and a compact second occupant seat is arranged over the second kick-up part 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a vehicle in which a kick-up portion raised upward is provided behind a floor panel forming a lower surface (floor surface) of a passenger compartment, and a passenger seat is disposed on the kick-up portion. The lower body structure.

Conventionally, as the lower body structure of the vehicle of the above-described example, there are structures shown in a plan view in FIG. 15, a side view on the driver's seat side in FIG. 16, and a side view on the passenger seat side in FIG.
That is, a floor panel 100 that forms the lower surface of the passenger compartment is provided, and a driver's seat 101 and a passenger seat 102 are juxtaposed side by side on the front of the floor panel 100, while the rear side of the floor panel 100 is upward A raised kick-up portion 103 having the same height on the left and right sides is provided, and rear seats 104 and 105 as left and right occupant seats are juxtaposed on the kick-up portion 103. In the intermediate portion in the width direction, a fuel tank 106 as a vehicle auxiliary machine is disposed below the outside of the vehicle.

  On the other hand, in Patent Document 1, a kick-up portion having the same height on the left and right is formed stepwise with respect to the floor panel, which includes a curved portion and an extended portion obtained by extending the curved portion as it is. Cross members extending in the vehicle width direction are provided on the vehicle outer front portion and the vehicle rear rear portion of the kick-up portion, respectively, and a rear seat is disposed on the kick-up portion, and the front and rear portions are disposed below the kick-up portion on the vehicle outer side. A fuel tank (vehicle auxiliary machine) is disclosed in which the upper surface of each cross member has a shape along the curved portion and the extension portion described above.

  In Patent Document 2, a kick-up floor portion is connected to a rear portion of a floor panel that forms a lower surface of a passenger compartment via a step portion, and a rear floor is connected to the kick-up floor portion via a rear kick-up portion. These steps, kick-up floor, rear kick-up, and rear floor are set to the same height on the left and right, and a rear seat is installed on the kick-up floor and rear kick-up as described above. On the other hand, there is disclosed a fuel tank (vehicle auxiliary machine) having a structure along the continuous shape of each of the above-described steps, kick-up floor, rear kick-up, and rear floor. Has been.

However, the above-described Patent Documents 1 and 2 do not disclose any technical idea of varying the size (height) of the kick-up portion in the vehicle width direction.
By the way, there is a demand for constructing a compact vehicle having a compact front and rear direction and a low overall height. In this case, it is necessary to ensure the occupant's comfortability and the capacity of the fuel tank.
Japanese Patent Laid-Open No. 6-211169 JP-A-5-627

  Therefore, the present invention provides a kick-up portion that is raised upward at the rear of the floor panel, and the kick-up portion is juxtaposed in the vehicle width direction with respect to the first kick-up portion and the first kick-up portion. And a second kick-up portion that is higher than the first kick-up portion in the height direction, and a fuel tank is disposed below the second kick-up portion, and above the first kick-up portion. A fuel tank is provided in a compact body having a compact front and rear direction and a low overall height by disposing a first occupant seat and a small second occupant seat above the second kick-up portion. An object of the present invention is to provide a lower body structure of a vehicle capable of ensuring both capacity and occupant comfort.

In the lower body structure of the vehicle according to the present invention, a kick-up portion raised upward is provided behind the floor panel forming the lower surface of the passenger compartment, and a passenger seat is disposed on the kick-up portion. A lower vehicle body structure of a vehicle, wherein the kick-up portion includes a first kick-up portion and a second kick-up portion that is juxtaposed in the vehicle width direction with respect to the first kick-up portion and that is higher in the height direction. The fuel tank is disposed below the second kick-up portion, the first occupant seat is disposed above the first kick-up portion, and above the second kick-up portion. The second passenger seat, which is smaller than the first passenger seat, is disposed.
The above-mentioned occupant seat on the kick-up section is set to a large seat that allows adults to sit corresponding to the first kick-up section, and only for children corresponding to the high second kick-up section. It may be set to a small sheet.
According to the above configuration, the fuel tank is disposed below (on the vehicle outside) the second kick-up portion having a high height, and the second smaller than the first occupant seat is disposed above the second kick-up portion. Since the first passenger seat is disposed above the first kick-up section having a low height and the passenger seat is disposed, the fuel tank capacity in a compact body having a compact front and rear direction and a low overall height. It is possible to achieve both the maintenance of passengers and the comfort of passengers.

In one embodiment of the present invention, a driver's seat is disposed in front of the first occupant's seat, and an assistant arranged in parallel with the driver's seat in the vehicle width direction is in front of the second occupant's seat. Seat seats are provided.
According to the above configuration, it is possible to secure the living space for the front seat occupant without offsetting the driver seat and the passenger seat in the front-rear direction of the vehicle.

In one embodiment of the present invention, a plurality of cross members are arranged in the front and rear in the second kick-up portion.
According to the above configuration, the vehicle body rigidity can be ensured by a plurality of cross members arranged side by side, and the rigidity against side collision can be improved. In particular, a small second passenger seat is provided. Sufficient strength can be ensured.

In one embodiment of the present invention, the second kick-up portion includes a front wall portion rising from a floor panel and a kick-up floor portion extending rearward from the front wall portion, and the front wall portion includes a front portion. A cross member is provided.
According to the above configuration, since the front cross member is provided at the portion where the shape of the floor panel changes (the portion where stress concentrates), the vehicle body rigidity can be ensured.

In one embodiment of the present invention, the second kick-up portion includes a front wall portion rising from a floor panel and a kick-up floor portion extending rearward from the front wall portion, and the front wall portion and the kick-up floor An intermediate cross member is disposed at a corner with the portion.
According to the above configuration, since the intermediate cross member is provided at the corner portion between the front wall portion of the second kick-up portion and the kick-up floor portion, that is, the portion where the shape of the floor panel changes (the portion where stress is concentrated). The vehicle body rigidity can be ensured.

In one embodiment of the present invention, the cross member of the second kick-up portion is connected to the cross member of the first kick-up portion by a tunnel portion in the center in the vehicle width direction.
The cross member of the second kick-up portion described above can be a front cross member or / and an intermediate cross member.
According to the above configuration, the overall rigidity and torsional rigidity of the vehicle body can be improved.

In one embodiment of the present invention, the cross member of the second kick-up portion is detachably provided.
According to the above configuration, maintainability and serviceability can be ensured when the cross member is removed. That is, since the fuel tank is disposed below the second kick-up portion, serviceability of the fuel tank can be ensured when the cross member is removed.

In one embodiment of the present invention, an auxiliary machine is disposed in the closed cross section of the cross member of the second kick-up portion.
You may set the above-mentioned auxiliary machine in a fuel pump.
According to the above configuration, since the auxiliary machine is disposed within the closed cross section of the cross member of the second kick-up portion, the capacity of the fuel tank disposed below the second kick-up portion can be increased.

In one embodiment of the present invention, a service hole for the fuel tank is formed in the tunnel portion at the center in the vehicle width direction.
According to the above configuration, the serviceability of the fuel tank can be ensured by forming the service hole.

In one embodiment of the present invention, the kick-up floor portion of the first kick-up portion includes a recessed portion provided with a recess, and the first occupant seat is disposed in the recessed portion.
According to the above configuration, a vertical space between the first occupant seat disposed in the recess and the roof portion can be ensured, so that even a low-height compact vehicle seats on the seat. It is possible to secure a passenger's living space.

  According to the present invention, the kick-up portion raised upward is provided at the rear of the floor panel, and the kick-up portion is juxtaposed in the vehicle width direction with respect to the first kick-up portion and the first kick-up portion. And a second kick-up portion that is higher than the first kick-up portion in the height direction, and a fuel tank is disposed below the second kick-up portion, and above the first kick-up portion. Since the first occupant seat is disposed and the small second occupant seat is disposed above the second kick-up portion, the fuel tank capacity in a compact body with a compact front and rear direction and a low overall height. It is possible to achieve both the securing of passengers and the comfort of passengers.

  A compact body with a compact front-rear direction and a low overall height, with the aim of ensuring both fuel tank capacity and passenger comfortability, is located behind the floor panel that forms the underside of the passenger compartment. A vehicle lower body structure in which a step-up kick-up portion is provided and an occupant seat is disposed on the kick-up portion, wherein the kick-up portion includes the first kick-up portion and the first kick-up portion. And a second kick-up portion that is higher in the vehicle width direction than the first portion and that is higher in the height direction, a fuel tank is disposed below the second kick-up portion, and the first kick-up portion The first occupant seat is disposed above the portion, and the second occupant seat smaller than the first occupant seat is disposed above the second kick-up portion.

An embodiment of the present invention will be described in detail with reference to the drawings.
(Example 1)
The drawings show the lower body structure of the vehicle. In FIG. 1 (perspective view), FIG. 2 (bottom view), FIG. 3 (side view on the driver's seat side), and FIG. A dash lower panel (dash panel) 1 that partitions the vehicle compartment in the front-rear direction is provided, and a floor panel 2 that extends substantially horizontally toward the rear is connected to the rear end of the lower end of the dash lower panel 1. Constitutes the lower surface, that is, the floor surface.

  A kick-up part 3 raised upward is provided at the rear part of the floor panel 2 described above. The kick-up part 3 includes a first kick-up part 4 on the driver's seat side (see the left side of the vehicle) and the first kick-up part 3. And a second kick-up portion 5 on the passenger seat side (see the right side of the vehicle) arranged in parallel with the kick-up portion 4 in the vehicle width direction.

  In addition, the second kick-up portion 5 is formed higher in the height direction than the first kick-up portion 4. In this embodiment, the height of the second kick-up portion 5 is set to be twice or more the height of the first kick-up portion 4.

  Here, as shown in FIG. 3, the first kick-up portion 4 includes a front wall portion 4a that rises upward from the floor panel 2, and a kick-up floor portion 4b that extends rearward from the front wall portion 4a. However, the middle of the kick-up floor portion 4b is recessed so as to be recessed downward, and is provided with a recess 4c.

  Further, as shown in FIG. 4, the second kick-up portion 5 includes a front wall portion 5a that rises upward from the floor panel 2, and a kick-up floor that extends substantially horizontally from the front wall portion 5a to the rear. The rising amount of the front wall portion 5a of the second kick-up portion 5 is set larger than the rising amount of the front wall portion 4a of the first kick-up portion 4.

  As shown in FIG. 1, a rear floor 7 is connected to the rear of the kick-up floors 4b and 5b in the kick-up unit 3 via a rear kick-up unit 6 having a small kick-up amount. .

  On the other hand, a tunnel portion 8 is formed at the center portion of the floor panel 2 so as to protrude toward the vehicle interior and extend in the front-rear direction of the vehicle. This tunnel portion 8 is formed between the dash lower panel 1 and the rear kick-up portion 6 so as to extend in the vehicle front-rear direction, and two tunnels 8 are closed between the tunnel portion 8 and the tunnel portion 8. Tunnel members 10 (so-called high-mount backbone frames) that form cross sections 9 and 9 (see FIG. 5) are joined.

  The tunnel member 10 described above is a vehicle body rigid member (strength member) that extends in the front-rear direction of the vehicle between the dash lower panel 1 and the rear kick-up portion 6 along the upper portion of the tunnel portion 8. The rigidity and vehicle body rigidity are improved.

Further, side sills extending in the front-rear direction of the vehicle are joined and fixed to both sides of the floor panel 2 in the vehicle width direction.
The side sill is a vehicle body rigid member having a side sill closed section that extends in the front-rear direction of the vehicle by joining the side sill outer panel, the side sill inner panel 11, and the side sill reinforcement.

  As shown in FIGS. 1, 3, and 4, a pair of left and right cross members 12 (No.) extending in the vehicle width direction by connecting a tunnel portion 8 and a side sill inner panel 11 to an intermediate portion in the front-rear direction of the floor panel 2. .2 cross member), and a closed cross section 13 is formed between the cross member 12 and the upper surface of the floor panel 2.

  As shown in FIG. 4, a cross member lower 14 </ b> A (No. 3 cross member) as a front cross member extending in the vehicle width direction is joined and fixed to the lower rear portion of the front wall portion 5 a of the second kick-up portion 5. A closed cross-section 15A extending in the vehicle width direction is formed between the cross member lower 14A and the front wall portion 5a.

  As shown in FIG. 3, a cross member lower 14 </ b> B extending in the vehicle width direction is fixed to the lower portion of the rear surface of the front wall portion 4 a of the first kick-up portion 4 so as to face the cross member lower 14 </ b> A in the vehicle width direction. A closed cross section 15B extending in the vehicle width direction is formed between the cross member lower 14B and the front wall 4a.

  As shown in FIGS. 1 and 4, a cross member upper 16 (an intermediate cross member extending in the vehicle width direction) is provided below the corners of the front wall portion 5a and the kick-up floor portion 5b in the second kick-up portion 5. No. 3 cross member upper) is joined and fixed, and a closed cross section 17 extending in the vehicle width direction is formed between the cross member upper 16 and the corner portions of the portions 5a and 5b.

  The cross member upper 16 is present on the second kick-up portion 5 side corresponding to the passenger seat side, and is not present on the first kick-up portion 4 side corresponding to the driver seat side.

  As shown in a perspective view in FIG. 1, the cross members 14 </ b> A and 16 of the second kick-up portion 5 are connected to the cross member 14 </ b> B of the first kick-up portion 4 by a tunnel portion 8 at the center in the vehicle width direction.

  As shown in FIG. 4, a rear cross member 18 (No. 4 cross) as a rear cross member extending in the vehicle width direction is formed on the lower surface of the rear kick up portion 6 immediately after the kick up floor portion 5b in the second kick up portion 5. A closed cross section 19 extending in the vehicle width direction is formed between the rear cross member 18 and the lower surface of the rear kick-up portion 6.

  As shown in FIG. 3, the rear cross member 18 is disposed so as to extend toward the lower surface of the rear kick-up portion 6 immediately after the kick-up floor portion 4 b of the first kick-up portion 4, and is on the first kick-up portion 4 side. The closed cross section 19 extending in the vehicle width direction is formed between the lower surface of the rear kick-up portion 6 and the rear cross member 18.

  The above-mentioned rear cross member 18 is a vehicle body rigid member provided integrally and continuously over substantially the entire width in the vehicle width direction of the rear kick-up portion 6 on the driver seat side and the passenger seat side.

  In short, as shown in FIG. 4, a plurality of cross members (see the cross member upper 16 and the cross member lower 14 </ b> A) are arranged in the second kick-up portion 5 separately from each other in the front-rear direction of the vehicle.

  As shown in FIG. 4, the second kick-up portion 5 is provided with cross members 14A, 16, 18 extending in the vehicle width direction by forming closed sections 15A, 17, 19 and these. These cross members 14A, 16, and 18 are configured to improve the rigidity of the vehicle body and the resistance to side collisions.

  Here, the above-described cross member lower 14A and the cross member upper 16 are also separated in the vertical direction of the vehicle, whereby cross members 14A, 16 extending in the vehicle width direction are vertically moved to the second kick-up portion 5. It will be arranged in parallel.

  On the other hand, as shown in FIGS. 1 and 2, a pair of left and right floor frames 20, 20 extending in the front-rear direction of the vehicle are provided at the intermediate portion between the side sill inner panel 11 and the tunnel portion 8 on the lower surface of the floor panel 2. A closed section 21 extending in the same direction is formed between the floor frame 20 and the lower surface of the floor panel 2.

The floor frame 20 is a vehicle body rigid member joined and fixed to the floor panel 2.
Further, a pair of left and right rear side frames 22 are provided on the lower side surfaces of the kick-up floor portions 4b and 5b and the rear floor 7. As shown in FIG. Rear side inner panels 23 and 23 are joined to the left and right side end portions of the kick-up floor portions 4b and 5b and the rear floor 7, and the rear side is located on the left side of the vehicle corresponding to the driver's seat as shown in FIG. A rear side frame lower 24 is joined and fixed between the inner panel 23 and the kick-up floor portion 4b.

  Also, as shown in FIG. 5, on the right side of the vehicle corresponding to the passenger seat, a rear floor frame 25 is joined and fixed between the kick-up floor portion 5b and the rear side inner panel 23 to extend in the front-rear direction of the vehicle. A closed section 26 is formed, and a rear side frame upper 27 and a rear side frame lower 28 are joined between the rear floor frame 25 and the rear side inner panel 23 to form a closed section 29 extending in the front-rear direction of the vehicle. Yes.

  By the way, as shown in the bottom of the body in FIG. 2, a transmission 30 is disposed in the lower space outside the tunnel portion 8 and the output of the transmission 30 is transmitted to the rear differential device 32 via the propeller shaft 31. The differential output of the rear differential device 32 is configured to be transmitted to the left and right rear wheels 34, 34 via the left and right rear wheel drive shafts 33, 33. The left and right rear wheels 34, 34 are suspended independently from each other by double wishbone type rear suspension devices 35, 35.

  Further, a power plant frame 36 (so-called PPF) having a substantially Z-shaped cross section and extending in the vehicle front-rear direction is provided between the transmission case of the transmission 30 and the differential case of the rear differential device 32.

  The power plant frame 36 is for suppressing wind-up vibration of the rear differential device 32 while allowing movement in the roll direction from the engine drive system.

Next, the auxiliary equipment arrangement structure of the vehicle will be described.
As shown in FIG. 2, the exhaust system of the engine includes an exhaust passage comprising a front exhaust pipe 37, a catalyst 38, a middle exhaust pipe 39, a pre-silencer 40, a rear exhaust pipe 41, a main silencer 42, and tail pipes 43, 43. 44, and the exhaust passage 44 is supported on the body side via the bracket 45, and the front exhaust pipe 37, the catalyst 38, and the middle exhaust pipe 39 are located in the lower space outside the vehicle of the tunnel portion 8, A part of the downstream side of the middle exhaust pipe 39 and the pre-silencer 40 are arranged in a lower space 46 outside the vehicle of the second kick-up portion 5 as shown in FIG.

  In addition, in the lower space 46 outside the vehicle of the second kick-up portion 5 described above, as shown in the figure, a fuel tank 48 having a fuel pump 47 is disposed as a large vehicle auxiliary machine. .

  Here, as shown in FIG. 5, a recess 48 a is formed in a portion corresponding to the propeller shaft 31, the power plant frame 36, and the pre-silencer 40 in the fuel tank 48, and the recess 48 a in the lower space 46 is formed. The power plant frame 36, the propeller shaft 31, and the pre-silencer 40 are disposed in the corresponding parts.

  That is, in the lower space 46 of the second kick-up portion 5, a fuel tank 48 as a plurality of vehicle accessories and a part of the pre-silencer 40 and the middle exhaust pipe 39 are arranged in parallel in the vehicle width direction.

  Further, as shown in FIG. 4, the above-described fuel tank 48 is supported on the vehicle body side by a tank band 50 which is attached between the cross member lower 14A and the rear cross member 18 using fastening members 49 such as bolts and nuts. Is.

  3 and 4, 51 is an instrument panel, 52 is a meter hood, 53 is a steering wheel, and 54 in FIG. 5 is a center console provided in the upper part of the tunnel member 10.

Next, with reference to FIGS. 3, 4, and 6, the arrangement structure of the sheet will be described.
A rear seat 60 as a large first passenger seat on which an adult passenger can sit is disposed on the kick-up floor portion 4b of the first kick-up portion 4 described above. The rear seat 60 includes a seat cushion 61, a seat back 62, and a headrest 63, and the seat cushion 61 is disposed along the recess 4c in the middle of the kick-up floor portion 4b as shown in FIG. With this structure, the rear seat occupant seated on the rear seat 60 is configured to expand the space in the vertical direction.

  As shown in FIGS. 4 and 6, a child seat as a second passenger seat smaller than the first passenger seat (see rear seat 60) is provided on the kick-up floor portion 5 b of the second kick-up portion 5. 64 (hereinafter simply abbreviated as a child seat) is provided. The child seat 64 includes a seat cushion 65 and a seat back 66.

  A front row seat is disposed in front of the rear row seat including the rear seat 60 and the child seat 64 described above, and a driver seat 67 (see FIG. 3) is disposed in front of the rear seat 60 as the first passenger seat. A passenger seat 68 (see FIG. 4) is disposed in front of the child seat 64 as a second passenger seat, and these front row seats are arranged side by side in the vehicle width direction.

  Here, as shown in FIGS. 3 and 6, the driver's seat 67 has a seat cushion 69, a seat back 70, and a headrest 71. Similarly, the passenger seat 68 is also shown in FIGS. As shown, it has a seat cushion 72, a seat back 73, and a headrest 74.

  7 is a schematic plan view showing the seat arrangement structure, FIG. 8 is a schematic side view showing the seat arrangement structure on the driver's seat side on the left side of the vehicle, and FIG. 9 shows the seat arrangement structure on the passenger seat side on the right side of the vehicle. FIG. 8 is a schematic side view showing that a large rear seat 60 is disposed on the first kick-up portion 4 as shown in FIG. 8, and a small child seat 64 is disposed on the second kick-up portion 5 as shown in FIG. When the front seat is disposed in front of each of the seats 60 and 64, the passenger seat 68 (see FIG. 9) is disposed in front of the child seat 64, and the driver seat 67 (see FIG. 8) is disposed in front of the rear seat 60. By installing the driver D, the passenger P, the rear seat occupant (adult) R, the rear seat occupant (child) C, while ensuring the comfortability of three adults and one child, each of these occupants D, P, R , C achieve multi-person ride It is obtained by Ku configuration.

  Further, as shown in FIG. 9, a fuel tank 48 as a large vehicle auxiliary machine is arranged in the lower space 46 on the vehicle outer side of the second kick-up portion 5 whose height is higher than that of the first kick-up portion 4. The fuel tank 48 is configured to ensure a sufficient capacity.

In particular, FIGS. 7, 8, and 9 are drawings for comparison with FIGS. 15, 16, and 17 showing the conventional structure.
FIG. 10 is an enlarged view of the main part of FIG. 4, and as shown in FIGS. 5 and 10, the cross member upper 16 of the second kick-up part 5 is configured to be detachable.

  That is, while providing the lid 75 (a part of the floor panel) provided with the front wall part 75a that also serves as the front wall part 5a of the second kick-up part 5 and the kick-up floor part 75b that also serves as the kick-up floor part 5b, As shown in FIG. 5, the cross member upper 16 is divided in the vehicle width direction at the parting lines 76 and 77 corresponding to the middle in the vehicle width direction at the lower part of the seat cushion 65 of the child seat 64, and the detachable divided portion 16 a. Is forming.

  In this divided portion 16a, the front and rear joint portions 16b and 16c of the cross member upper 16 are joined and fixed to the lower surface of the lid 75 as shown in FIG. Further, a stepped contact flange portion 75 c is integrally formed around the lid 75.

  Further, an opening 16d is formed in the divided portion 16a of the cross member upper 16 corresponding to the fuel pump 47 as an auxiliary machine, and the cross of the second kick-up portion 5 is formed through the opening 16d. The above-described fuel pump 47 is provided in the closed cross section 17 in the divided portion 16a of the member upper 16, and this structure is configured to increase the capacity of the fuel tank 48.

  Then, at the time of maintenance and service, once at least the seat cushion 65 of the child seat 64 is removed, and then the lid 75 and the dividing portion 16a are integrally removed, the service hole 78 for the fuel tank 48 service is opened, The service hole 78 is opened so that the fuel tank 48 can be serviced.

Thus, the lower body structure of the vehicle of the embodiment shown in FIGS. 1 to 10 is provided with the kick-up portion 3 raised upwards behind the floor panel 2 forming the lower surface of the passenger compartment. A vehicle lower body structure in which occupant seats 60 and 64 are disposed on the kick-up portion 3, wherein the kick-up portion 3 is connected to the first kick-up portion 4 and the first kick-up portion 4. The second kick-up portion 5 is arranged in parallel in the vehicle width direction and is higher in the height direction. A fuel tank 48 is disposed below the second kick-up portion 5 and the first kick-up portion A first occupant seat (see rear seat 60) is disposed above the portion 4, and a second occupant seat smaller than the first occupant seat (see child seat 64) is disposed above the second kick-up portion 5. Is arranged.
In this embodiment, the occupant seat on the kick-up portion 3 is set to a large seat 60 that is allowed to be seated by an adult corresponding to the first kick-up portion 4, and the second kick is high. Corresponding to the up portion 5, a small child seat 64 is set.
According to this configuration, the fuel tank 48 is disposed below the second kick-up portion 5 having a high height (outside the vehicle), and above the second kick-up portion 5, the first passenger seat (rear seat 60) is disposed. Since the second passenger seat (refer to the child seat 64) smaller than the reference) is disposed, and the first passenger seat (refer to the rear seat 60) is disposed above the first kick-up portion 4 having a lower height. In a compact body that is compact in the front-rear direction and has a low overall height, it is possible to ensure both the capacity of the fuel tank 48 and the comfort of the rear seat occupant.

A driver seat 67 is disposed in front of the first passenger seat (see the rear seat 60), and in front of the second passenger seat (see the child seat 64) in the vehicle width direction. A passenger seat 68 arranged side by side is provided.
According to this configuration, it is possible to secure a living space for the front seat occupant without offsetting the driver seat 67 and the passenger seat 68 in the front-rear direction of the vehicle.

Further, a plurality of cross members 14A, 16 are arranged in the front and rear in the second kick-up portion 5.
According to this configuration, the vehicle body rigidity can be ensured by the plurality of cross members 14A, 16 arranged side by side, and the rigidity against the side collision can be improved. In particular, a small second passenger seat ( It is possible to ensure sufficient strength on the side where the child seat 64 is disposed.

In addition, the second kick-up portion 5 includes a front wall portion 5a rising from the floor panel 2 and a kick-up floor portion 5b extending rearward from the front wall portion 5a. A cross member (see cross member lower 14A) is provided.
According to this configuration, since the front cross member (cross member lower 14A) is provided in a portion where the shape of the floor panel 2 changes (a portion where stress is concentrated), the vehicle body rigidity can be ensured.

The second kick-up portion 5 includes a front wall portion 5a rising from the floor panel 2 and a kick-up floor portion 5b extending rearward from the front wall portion 5a. The front wall portion 5a and the kick-up floor portion An intermediate cross member (see the cross member upper 16) is disposed at a corner with respect to 5b.
According to this configuration, the intermediate cross member is formed at the corner between the front wall portion 5a of the second kick-up portion 5 and the kick-up floor portion 5b, that is, at a portion where the shape of the floor panel 2 changes (a portion where stress is concentrated). Since the (cross member upper 16) is provided, the vehicle body rigidity can be ensured.

In addition, as shown in FIG. 1, the cross members 14A and 16 of the second kick-up portion 5 are connected to the cross member 14B of the first kick-up portion 4 by the tunnel portion 8 in the center in the vehicle width direction. is there.
According to this configuration, it is possible to improve the overall rigidity and torsional rigidity of the vehicle body.

The cross member (see the cross member upper 16) of the second kick-up portion 5 is detachably provided.
According to this configuration, it is possible to ensure maintainability and serviceability when removing the cross member (see the divided portion 16a of the cross member upper 16). That is, since the fuel tank 48 is disposed below the second kick-up portion 5, when the cross member (see the divided portion 16a of the cross member upper 16) is removed, serviceability to the fuel tank 48 is ensured. can do.

Further, an auxiliary machine (refer to the fuel pump 47) is disposed in the closed section 17 of the cross member 16 of the second kick-up portion 5.
According to this configuration, since the auxiliary machine (see the fuel pump 47) is disposed in the closed cross section 17 of the cross member 16 of the second kick-up portion 5, the fuel disposed below the second kick-up portion 5 is disposed. The capacity of the tank 48 can be increased.

In addition, the kick-up floor portion 4b of the first kick-up portion 4 is provided with a recessed portion 4c provided with a first occupant seat (see the rear seat 60).
According to this configuration, the vertical space between the first occupant seat (rear seat 60) disposed in the recess 4c and the roof portion can be secured, so the seat can be used even in a compact vehicle with a low overall height. It is possible to secure a living space for the rear-seat occupant R (see FIG. 8) who sits at 60.

(Example 2)
11 to 14 show another embodiment of a lower body structure of a vehicle.
In this embodiment, the fuel pump 47 on the upper side of the fuel tank 48 uses a fuel tank 48 of a type provided corresponding to the tunnel portion 8 in the center in the vehicle width direction and the rear side of the tunnel member 10.

11 is a cross-sectional view taken along the line B-B in FIG. 11, and an enlarged view of the main part of FIG. 12 is shown in FIG. 13, the portion of the tunnel portion 8 facing the fuel pump 47 has A split portion 80 is formed, and a split portion 81 is also formed in the tunnel member 10 so as to face the split portion 80 in the vertical direction, and both the split portions 80 and 81 are joined to form a detachable lid 82. In addition, when the lid 82 is removed, a service hole 83 that allows access to the fuel pump 47 and the fuel tank 48 is formed.
Further, a stepped contact flange portion 81 a is integrally formed around the divided portion 81 in the tunnel member 10.

  Here, instead of the structure shown in FIG. 13, in addition to the step-shaped contact flange 81 a around the dividing portion 81 in the tunnel member 10 as shown in FIG. 14, around the dividing portion 80 of the tunnel portion 8. Alternatively, a step-shaped contact flange portion 80a may be integrally formed, and the upper and lower contact flange portions 81a, 80a may be configured to improve sealing performance between the vehicle interior and the vehicle exterior. Good.

As described above, in the embodiment shown in FIGS. 11 to 14, the service hole 83 of the fuel tank 48 is formed in the tunnel portion 8 at the center in the vehicle width direction.
According to this configuration, the serviceability of the fuel tank 48 can be ensured by forming the service hole 83.

  In the embodiment shown in FIGS. 11 to 14, since the other configurations, operations, and effects are the same as those in the previous embodiment, the same parts in FIGS. The detailed description is omitted.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The first passenger seat of the present invention corresponds to the rear seat 60 of the embodiment,
Similarly,
The second passenger seat corresponds to the child seat 64,
The cross member of the second kick-up portion corresponds to the cross member lower 14A and the cross member upper 16,
The front cross member corresponds to the cross member lower 14A,
The intermediate cross member corresponds to the cross member upper 16,
The auxiliary machine corresponds to the fuel pump 47 located above the fuel tank 48,
The present invention is not limited to the configuration of the above-described embodiment.

  For example, the second occupant seat may be smaller than the first occupant seat (rear seat 60), and is not limited to the child seat 64.

The perspective view which shows the lower vehicle body structure of the vehicle of this invention Bottom view of the main part of the vehicle Side view showing the configuration of the driver's seat Side view showing the configuration of the passenger side 2 is a cross-sectional view taken along line AA in FIG. Plan view showing the arrangement of seats Schematic plan view showing auxiliary machine and seat arrangement structure Schematic side view showing the occupant seated state on the driver's seat side Schematic side view showing passenger seated state on passenger side 4 is an enlarged side view of the main part of FIG. The perspective view which shows the other Example of the lower body structure of a vehicle Explanatory drawing which follows the BB line of FIG. 12 is an enlarged view of the main part of FIG. Enlarged view showing another embodiment of the lid structure Schematic plan view showing a conventional auxiliary machine and seat arrangement structure 15 is a side view of the driver side in FIG. Side view of the passenger seat side in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Floor panel 3 ... Kick-up part 4 ... 1st kick-up part 4b ... Kick-up floor part 4c ... Recessed part 5 ... 2nd kick-up part 5a ... Front wall part 5b ... Kick-up floor part 8 ... Tunnel part 14A ... Cross Member lower (front cross member)
14B ... Cross member 16 ... Cross member upper (intermediate cross member)
17 ... Closed section 47 ... Fuel pump (auxiliary)
48 ... Fuel tank 60 ... Rear seat (first passenger seat)
64 ... Child seat (second passenger seat)
67 ... Driver seat 68 ... Passenger seat 83 ... Service hall

Claims (10)

At the rear of the floor panel that forms the lower surface of the passenger compartment, a kick-up portion raised upward is provided,
A vehicle lower body structure in which an occupant seat is disposed on the kick-up portion,
The kick-up portion is arranged in the vehicle width direction with respect to the first kick-up portion and the first kick-up portion,
And consists of a second kick-up section that is higher in the height direction,
A fuel tank is disposed below the second kick-up portion,
A first occupant seat is disposed above the first kick-up portion;
A vehicle lower body structure in which a second occupant seat smaller than the first occupant seat is disposed above the second kick-up portion. A driver's seat is disposed in front of the first passenger seat,
The lower body structure of a vehicle according to claim 1, wherein a front passenger seat is disposed in front of the second passenger seat in parallel with the driver seat. The lower body structure of a vehicle according to claim 1 or 2, wherein a plurality of cross members are arranged in front and rear in the second kick-up portion. The second kick-up portion includes a front wall portion rising from a floor panel, and a kick-up floor portion extending rearward from the front wall portion,
The vehicle lower body structure according to claim 3, wherein a front cross member is disposed on the front wall portion. The second kick-up portion comprises a front wall portion rising from the floor panel, and a kick-up floor portion extending rearward from the front wall portion,
The lower body structure of a vehicle according to claim 3 or 4, wherein an intermediate cross member is disposed at a corner portion between the front wall portion and the kick-up floor portion. The vehicle lower body structure according to any one of claims 3 to 5, wherein the cross member of the second kick-up portion is connected to the cross member of the first kick-up portion by a tunnel portion in the center in the vehicle width direction. The vehicle lower body structure according to any one of claims 3 to 6, wherein the cross member of the second kick-up portion is detachably provided. The vehicle lower body structure according to any one of claims 3 to 7, wherein an auxiliary machine is disposed in a closed cross section of the cross member of the second kick-up portion. The vehicle lower body structure according to any one of claims 3 to 8, wherein a service hole for the fuel tank is formed in a tunnel portion at a center in a vehicle width direction. The kick-up floor portion of the first kick-up portion includes a recessed portion that is recessed.
The lower body structure of a vehicle according to any one of claims 1 to 9, wherein a first passenger seat is disposed in the recess.

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