JP5073709B2 - Body floor structure - Google Patents

Description

  In the present invention, the front and rear cross members are bridged between the left and right side sills, the left and right floor frames are provided between the left and right side sills, and the fuel tank is provided between the front and rear cross members and in the space between the left and right floor frames. Related to the vehicle body floor structure.

Some vehicle body floor structures include a fuel tank below the floor panel and in the approximate center of the front side of the vehicle body, and a cross member (hereinafter referred to as “rear cross member”) on the rear side of the vehicle body of the fuel tank. .
This fuel tank is provided in front of the vehicle body of a fuel filler provided in the rear side portion of the vehicle body.
Therefore, in order to extend the fuel supply pipe from the fuel supply port to the fuel tank, a through hole or a through recess is formed in the rear cross member, and the oil supply pipe is passed through the through hole or the through recess (see, for example, Patent Document 1). .

JP 2006-248381 A

Here, in the vehicle body floor structure of Patent Document 1, a through hole or a through recess is formed in the rear cross member, and the fuel supply pipe is passed through the through hole or the through recess to extend to the fuel tank.
In this way, it is conceivable that the formation of through holes and through recesses in the rear cross member affects the reinforcement of the floor panel by the rear cross member.

Therefore, it is necessary to reinforce the floor panel with a reinforcing member or the like so that the reinforcement of the floor panel by the rear cross member is not impaired.
For this reason, the number of parts of the vehicle body floor structure increases and the configuration becomes complicated, and there is room for improvement from this viewpoint.

  It is an object of the present invention to provide a vehicle body floor structure that can ensure the rigidity of a rear cross member by removing a through hole or a through recess through which a fuel supply pipe is passed from the rear cross member.

According to the first aspect of the present invention, the left and right floor frames extending from the rear end portions of the left and right front side frames toward the rear of the vehicle body, the vehicle body outside the left and right floor frames, and extending in the vehicle body longitudinal direction. Left and right side sills, a rear cross member spanned between the left and right side sills, a floor bulge portion that is placed on the rear cross member and the left and right floor frames and can store a fuel tank from below. A raised floor panel, a front cross member provided on the front side of the rear cross member, and a front cross member provided above the left and right front side frames in a state of being spanned by the left and right side sills, wherein the rear cross member is provided on the lower surface of the rear end portion of the floor bulging portion, provided the front cross member on the upper surface of the front end portion of the floor bulging portion Are the left and right floor frames as would extend the rising gradient from the rear end of the front side frame of the left and right towards the rear of the vehicle body to the rear end of the floor bulging portion, after the left and right floor frames An end portion is provided on the rear cross member, and the front cross member is provided on the front end portion of the floor panel and on the upper surface of the floor bulge portion, so that the center portion is along the upper surface of the floor bulge portion. And the front cross member is provided so as to be orthogonal to the left and right floor frames, and the left side portion of the floor panel is sandwiched between the front cross member and the left floor frame, The right side portion of the floor panel is sandwiched between the front cross member and the right floor frame, and the rear cross member is a bottom portion of left and right end portions. By forming a downward slope toward the outside of the vehicle body, the left and right end portions are respectively formed in the cross-sectional enlarged portion, the central portion is disposed at a high position, and the left and right cross-sectional enlarged portions are arranged behind the left and right floor frames. An end portion is connected, and a space in which a fuel supply pipe of the fuel tank can be arranged is secured in the central portion .

According to a second aspect of the present invention, left and right rear floor frames extend from the left and right cross-sectional enlarged portions of the rear cross member toward the rear of the vehicle body, and the front end portion of the left rear floor frame and the rear end portion of the left floor frame have It is combined in a state of being overlapped with the bottom of the enlarged portion, and a front end portion of the right rear floor frame and a rear end portion of the right floor frame are combined in a state of being overlapped with the bottom portion of the right cross-sectional enlarged portion. And

According to a third aspect of the present invention, the left and right side sills are connected to the left and right ends of the rear cross member and are connected to the rear ends of the left and right floor frames by projecting inward in the vehicle width direction. The left sill inflating portion has left and right sill inflating portions, and the left sill inflating portion extends from the connecting portion of the left side sill and the left end portion of the front cross member in an inclined manner toward the rear end portion of the left floor frame. The right sill inflating portion includes a right front sill and a right front slope extending from the connection portion of the right end of the right side sill and the front cross member toward the rear end of the right floor frame in an inclined manner. It is characterized by having.

According to a fourth aspect of the present invention, the left sill inflating portion has a left rear sloping portion extending in an inclined manner from the left end portion of the rear cross member toward the left side sill, and the right sill inflating portion includes the rear sill inflating portion. A guide rail having a right rear inclined portion extending in an inclined manner from the right end portion of the cross member toward the right side sill, and slidably guiding the slide door along at least one of the left and right rear inclined portions. By providing, at least one of the left and right rear inclined portions is reinforced by the guide rail.

In the invention according to claim 1, the left and right floor frames are extended upwardly to the rear end of the floor bulge portion with the vehicle body rearward. And the rear end part of the floor bulge part and the rear end part of the left and right floor frames were provided on the rear cross member.
Therefore, the rear end portion and the rear cross member of the floor bulge portion can be disposed upward.

By disposing the rear cross member upward, a relatively large space can be secured below the rear cross member, and an oil supply pipe or the like can be disposed in a relatively large space.
Therefore, the through hole and the through recess through which the oil supply pipe passes can be removed from the rear cross member, and the floor panel can be reliably reinforced by the rear cross member.
Thereby, the reinforcement member which reinforces a floor panel can be made unnecessary, the increase in the number of parts can be suppressed, and the configuration can be simplified.

Moreover, the rear part of the rear end portion of the floor panel can be arranged upward (lifted) by arranging the rear end portion of the floor bulge portion upward.
The inclination angle from the rear part of the floor panel to the top of the floor bulge can be kept small, and the ankle angle of the rear seat occupant can be moderated.

In the invention according to claim 1 , the fuel tank can be provided upward by bending the central portion of the front cross member upward along the front end portion of the floor bulging portion.
Thereby, a relatively large space can be secured below the fuel tank, and an exhaust pipe or the like can be disposed in the relatively large space.

  Further, by providing the front and rear cross members, the front and rear cross members can be provided with seats.

Moreover, in the invention which concerns on Claim 1 , rigidity was improved by making a right-and-left end part into a cross-sectional enlarged part, and the rear-end part of the right and left floor frame was connected to the right-and-left cross-sectional enlarged part.
Thereby, the load which acted on the left and right floor frames from the front of the vehicle body can be reliably supported by the left and right cross-section enlarged portions.

Furthermore, the center part of the rear cross member can be disposed at a high position by forming the bottom part of the left and right end parts of the rear cross member with a downward slope toward the outside of the vehicle body.
Thereby, the space which can arrange | position oil supply piping etc. under the center part of a rear cross member is securable.

In the invention according to claim 2 , the front end portions of the left and right rear floor frames and the rear end portions of the left and right floor frames are coupled in a state of being overlapped with the bottom portions of the left and right cross-sectional enlarged portions, respectively.
Therefore, the front end portions of the left and right rear floor frames and the rear end portions of the left and right floor frames can be firmly connected to the bottom portions of the left and right cross-sectional enlarged portions, and the rigidity of the left and right connecting portions can be increased.

Thereby, the load which acted on the left and right floor frames from the front of the vehicle body can be efficiently transmitted to the left and right rear floor frames via the left and right connecting portions.
Furthermore, by increasing the rigidity of the left and right connecting portions, the load applied from the side of the vehicle body can be efficiently transmitted to the rear cross member via the left and right connecting portions.

In the invention which concerns on Claim 3 , the left and right sill expansion | swelling parts were provided in the left and right side sill. The left and right sill inflated portions were connected to the left and right ends of the rear cross member, and were connected to the rear ends of the left and right floor frames.
In addition, left and right front inclined portions are provided in the left and right sill expansion portions. Then, the left and right front inclined portions were inclinedly extended from the connecting portions of the left and right side sills and the left and right end portions of the front cross member toward the rear end portions of the left and right floor frames.

  Therefore, for example, when a load is applied to the left end portion of the front cross member from the left side of the vehicle body, the applied load can be distributed to the left front inclined portion of the left sill expansion portion. Then, the load dispersed in the left front inclined portion can be transmitted to the rear cross member via the rear end portion of the left floor frame and the left end portion of the rear cross member.

Thereby, when a load acts on the left end portion of the front cross member from the left side of the vehicle body, the load transmitted to the front cross member can be suppressed.
Therefore, even if the center part of the front cross member is curved upward, the load transmitted to the front cross member can be supported by the front cross member.

  Even when a load acts on the right end portion of the front cross member from the right side of the vehicle body, the load transmitted to the front cross member can be supported by the front cross member in the same manner as when a load acts on the left side of the vehicle body.

Further, for example, when a load is applied to the left floor frame from the front of the vehicle body, the applied load can be distributed to the left side sill via the left sill inflating portion.
Thereby, when a load acts on the left floor frame from the front of the vehicle body, the load transmitted to the left floor frame can be suppressed, and the transmitted load can be supported by the left side sill or the left floor frame.

  Even when a load acts on the right floor frame from the front of the vehicle body, the load transmitted to the right floor frame can be supported by the right side sill or the right floor frame in the same manner as when a load acts on the left floor frame.

In the invention according to claim 4 , the left and right rear inclined portions are provided in the left and right sill inflatable portions. Then, the left and right rear inclined portions are inclinedly extended from the left and right end portions of the rear cross member toward the left and right side sills.
And the guide rail of the slide door is provided along at least one of the left and right rear inclined portions, so that at least one of the left and right rear inclined portions is reinforced by the guide rail.

Therefore, the guide rail of the slide door can also be used as a reinforcing member.
Thereby, since it is not necessary to provide a dedicated reinforcement member separately, the number of parts can be suppressed and weight reduction can be achieved.

Further, by extending the left and right rear inclined portions in an inclined manner, when a load acts on the rear part of the left and right rear inclined portions from the side of the vehicle, the applied load passes through the left and right rear inclined portions to the rear cross. Can be distributed to members.
Thereby, the load which acted on the back part of the right-and-left rear inclined part can be suitably supported with a back cross member.

It is a perspective view which shows the vehicle provided with the vehicle body floor structure which concerns on this invention. It is a perspective view which shows the vehicle body floor structure which concerns on this invention. It is a disassembled perspective view which shows the vehicle body floor structure of FIG. It is a top view which shows the vehicle body floor structure which concerns on this invention, and shows the state which removed the floor panel. It is a bottom view which shows the state which looked at the vehicle body floor structure of FIG. 4 from the downward direction. It is a side view which shows the vehicle body floor structure which concerns on this invention, and shows the state which decomposed | disassembled the front seat. It is a side view which shows the vehicle body floor structure which concerns on this invention, and shows the state which attached the front and back seat | sheet. It is a rear view which shows the vehicle body floor structure which concerns on this invention. (A) is a perspective view which shows the left floor frame of the vehicle body floor structure which concerns on this invention, a left rear floor frame, and a rear cross member, (b) is a disassembled perspective view of (a). It is a front view which shows the vehicle body floor structure which concerns on this invention. It is the 11-11 line sectional view of Drawing 4. It is a figure explaining the example which supports the load which acted on the left front side frame which concerns on this invention from the vehicle body front. It is a figure explaining the example which supports the load which acted on the left side sill (part corresponded in the left end part of a front cross member) concerning the present invention from the vehicle body left side. It is a figure explaining the example which supports the load which acted on the left side sill (back site | part of a left rear inclination part) which concerns on this invention from the vehicle body left side. It is a figure explaining the example which supports the load which acted on the left side sill (part corresponded in the left end part of a rear cross member) concerning the present invention from the vehicle body left side.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, and “right” indicate the direction viewed from the driver, the front side is Fr, the rear side is Rr, the left side is L, and the right side is R.

The vehicle body floor structure 10 according to the embodiment will be described.
As shown in FIGS. 1 to 3, the vehicle body floor structure 10 includes left and right front side frames 11 extending in the longitudinal direction of the vehicle body and rear end portions 11 a of the left and right front side frames 11 toward the rear of the vehicle body. Left and right floor frames 12 extended, left and right side sills 13 provided outside the vehicle body of the left and right floor frames 12 and extended in the longitudinal direction of the vehicle body, and a cross member 14 laid over the left and right side sills 13 And the left and right rear floor frames 15 extending from the left and right end portions 14a, 14b of the rear cross member 14 toward the rear of the vehicle body, and the rear cross member 14, the left and right floor frames 12, and the left and right rear floor frames 15. Floor panel 16 and a front panel placed on the floor panel 16 and spanned between the left and right side sills 13. And a Sumenba 17.

A slide door 18 is provided along the left side sill 13 of the vehicle body floor structure 10 so as to be slidable in the longitudinal direction of the vehicle body.
A guide rail 19 (see FIG. 11) for slidably guiding the slide door 18 is provided in the left side sill 13.

The vehicle body floor structure 10 is provided such that a floor bulging portion 21 of the floor panel 16 is raised, and a fuel tank 23 is accommodated in the floor bulging portion 21 from below.
As shown in FIGS. 4 and 5, the fuel tank 23 is formed in a substantially rectangular shape in plan view, and is provided in the space 25 between the left and right floor frames 12 and between the front and rear cross members 17 and 14.
The fuel tank 23 includes a fuel supply pipe 26 extending rearward from the rear left end 23a, a breather pipe 27 extending rearward from the upper portion 23b, and a right side portion of the fuel tank 23 extending from the rear right end 23c. And a fuel supply pipe 28 extending forward of the vehicle body through 23d.

Further, the fuel tank 23 has a recess 29 formed in the lower right side portion. By forming the recess 29 in the lower right portion of the fuel tank 23, a space 32 (see also FIG. 8) for receiving the exhaust pipe 31 can be secured.
The oil supply pipe 26 is an oil supply pipe that communicates with the fuel tank 23 from an oil supply port (not shown).
The breather pipe 27 is a pipe for suitably maintaining the internal pressure in the fuel tank 23.
The fuel supply pipe 28 is a supply pipe that supplies fuel to an engine (not shown).

The left and right front side frames 11 are provided at predetermined intervals in the vehicle width direction and extend in the vehicle body front-rear direction.
The vicinity of the rear end portion 11a of the left front side frame 11 and the front end portion 13a of the left side sill 13 are connected by a left outrigger 34 (see also FIGS. 2 and 3).
The vicinity of the rear end portion 11a of the right front side frame 11 and the front end portion 13a of the right side sill 13 are connected by a right outrigger 34 (see also FIGS. 2 and 3).

The left and right floor frames 12 are provided at predetermined intervals in the vehicle width direction.
As shown in FIG. 9, the left floor frame 12 includes a bottom portion 36, inner and outer side walls 37 raised from the inside and outside of the bottom portion 36, an inner flange 38 bent from the inner side wall 37 toward the passenger compartment, and an outer wall. 37 and an outer flange 38 bent outward from the vehicle.
The left floor frame 12 is formed in a so-called substantially hat-shaped cross section so as to open upward at the bottom portion 36, the inner and outer side walls 37, and the inner and outer flanges 38.
The right floor frame 12 is a member formed symmetrically with the left floor frame 12, and detailed description thereof is omitted.

As shown in FIGS. 6 and 7, the left and right floor frames 12 are extended from the rear end portions 11 a of the left and right front side frames 11 to the rear end portion 21 a of the floor bulge portion 21 with an upward slope of an inclination angle θ1. The rear end 12a is provided on the rear cross member 14 (see also FIG. 9).
Therefore, the rear cross member 14 can be provided (lifted) upward to the height H1.
In addition, the rear end 21 a of the floor bulging portion 21 placed on the rear cross member 14 can be provided (lifted) together with the rear cross member 14.

As shown in FIG. 8, by providing the rear cross member 14 upward to the height H <b> 1, a relatively large space 41 can be secured below the rear cross member 14.
By securing the space 41 below the rear cross member 14, the oil supply pipe 26, the breather pipe 27, and the like can be arranged in the space 41.
Therefore, there is no need to form a through hole or a through recess in the rear cross member 14 through which the oil supply pipe 26, the breather pipe 27, etc. pass, so that the rigidity of the rear cross member 14 can be ensured.

By ensuring the rigidity of the rear cross member 14, the floor panel 16 (see FIGS. 2 and 3) can be reliably reinforced only by the rear cross member 14.
Thereby, in order to reinforce the floor panel 16, the reinforcement member conventionally required can be made unnecessary, the increase in the number of parts can be suppressed, and the configuration can be simplified.

As shown in FIG. 6, by arranging the rear end portion 21 a of the floor bulging portion 21 upward, the rear portion 16 a of the rear end portion 21 a of the floor panel 16 can be arranged upward (lifted).
Therefore, the inclination angle θ2 from the rear portion 16a to the top portion 21c of the floor bulging portion 21 can be suppressed small.

Here, the rear end portion 21 a of the floor bulging portion 21 is provided above the rear cross member 14, and the rear leg portion 43 a of the front seat 43 is attached to the rear cross member 14 with the bolts 44 via the rear end portion 21 a. ing. A front leg 43 b of the front seat 43 is attached to the front cross member 17 with a bolt 44.
That is, the front seat 43 is provided by the bolts 44 on the front and rear cross members 17 and 14.

As shown in FIG. 7, a rear seat 46 is provided on the vehicle rear side of the front seat 43.
The foot 48 of the occupant 47 seated on the rear seat 46a of the rear seat 46 is placed on the floor panel 16 (specifically, the rear portion 16a).

Here, the inclination angle θ2 from the rear portion 16a of the floor panel 16 to the top portion 21c (see FIG. 6) is kept small.
Thus, with the foot 48 of the occupant 47 seated on the rear seat 46a placed on the rear portion 16a (specifically, the carpet 49), the ankle angle θ2 of the foot 48 (ie, from the rear portion 16a to the top portion 21c). Can be moderated.
A carpet 49 is laid on the surface of the floor panel 16.

As shown in FIGS. 8 and 9, the rear cross member 14 is spanned between the left and right side sills 13, and a rear end portion 21 a (see FIG. 6) of the floor bulging portion 21 is provided.
The rear cross member 14 is bent from the bottom 51, front and rear side walls 52 raised from the inside and outside of the bottom 51, a front flange 53 bent from the front side wall 52 to the front side of the vehicle body, and from the rear side wall 52 to the rear side of the vehicle body. And a rear flange 53.
The rear cross member 14 is formed in a so-called substantially hat-shaped cross section so as to open upward at the bottom 51, the front and rear side walls 52, and the front and rear flanges 53.

After this, the cross member 14 has a state in which the cross-sectional area S of each of the left and right end portions 14a is enlarged by forming the bottom portion 51a of the left and right end portions 14a to have a downward slope with an inclination angle θ3 toward the outside of the vehicle body. Is formed.
Hereinafter, the left and right end portions 14a will be described as left and right cross-sectional enlarged portions 14a, respectively.
By setting the left and right end portions 14a of the rear cross member 14 to the left and right cross-sectional enlarged portions 14a, the rigidity of the left and right end portions 14a can be increased.

As shown in FIG. 9, the rear end portion 12a of the left floor frame 12 is connected to the left section enlarged portion 14a.
As a result, the load F1 applied to the left floor frame 12 from the front of the vehicle body can be reliably supported by the left and right cross-sectional enlarged portions 14a.

  The right cross-section enlarged portion 14a shown in FIG. 8 is a member symmetrical to the left cross-sectional enlarged portion 14a, and the load acting on the right floor frame 12 (see FIG. 4) from the front of the vehicle body is surely received by the right cross-sectional enlarged portion 14a. Can support you.

As shown in FIG. 8, the center part 14b of the rear cross member 14 is made high by forming the bottom 51a of the left and right cross-sectional enlarged parts 14a of the rear cross member 14 downward with an inclination angle θ3 toward the outside of the vehicle body. It can arrange | position to the position H1.
By arrange | positioning the center part 14b in the high position H1, the bottom part 51b can be arrange | positioned in the high position H2 among the center parts 14b.
Thereby, the space 41 which can arrange | position the oil supply piping 26, the breather pipe | tube 27, etc. below the bottom part 51b among the center parts 14b is securable.

As shown in FIGS. 4 and 5, left and right rear floor frames 15 extend from the left and right cross-sectional enlarged portions 14a of the rear cross member 14 toward the rear of the vehicle body, and are provided at predetermined intervals in the vehicle width direction. .
As shown in FIG. 9, the left rear floor frame 15 includes a bottom portion 56, inner and outer side walls 57 raised from the inside and outside of the bottom portion 56, an inner flange 58 bent from the inner side wall 57 toward the passenger compartment, and an outer wall. 57 and an outer flange 58 bent outward from the vehicle.

  The left rear floor frame 15 is formed in a so-called substantially hat shape so as to open upward at the bottom portion 56, the inner and outer side walls 57 and the inner and outer flanges 58.

The front end portion 15a of the left rear floor frame 15 and the rear end portion 12a of the left floor frame 12 are joined in a state of being overlapped with the bottom portion 51a of the left section enlarged portion 14a.
Specifically, the bottom portion 56a of the front end portion 15a of the left rear floor frame 15 extends to the front side of the vehicle body. Further, the bottom portion 36a of the rear end portion 12a of the left floor frame 12 extends to the rear side of the vehicle body.
The bottom portion 56a of the front end portion 15a is overlapped with the bottom portion 51a of the left section enlarged portion 14a from below, and the bottom portion 36a of the rear end portion 12a is overlapped with the bottom portion 56a of the front end portion 15a.
In this state, the bottom 51a, the bottom 56a, and the bottom 36a are joined (joined).
Therefore, the rigidity of the left connecting portion 61 (see also FIG. 5) to which the bottom portion 51a, the bottom portion 56a, and the bottom portion 36a are coupled can be increased.

As shown in FIGS. 4 and 5, the right rear floor frame 15 is a member formed symmetrically with the left rear floor frame 15.
The front end portion 15a of the right rear floor frame 15 and the rear end portion 12a of the right floor frame 12 are joined in a state of being overlapped with the bottom portion 51a of the right section enlarged portion 14a.
Therefore, the front end portion 15a of the left and right rear floor frames 15 and the rear end portion 12a of the left and right floor frames can be firmly connected to the bottom portions 51a of the left and right cross-sectional enlarged portions 14a, and the rigidity of the left and right connecting portions 61 can be increased.

As a result, as shown in FIG. 9, the load F <b> 1 applied to the left floor frame 12 from the front of the vehicle body can be efficiently transmitted to the left rear floor frame 15 via the left connecting portion 61.
Moreover, the load F1 can be more efficiently transmitted by ensuring large polymerization allowance T (refer FIG.9 (b)) of the bottom part 56a of the front-end part 15a, and the bottom part 36a of the rear-end part 12a.

Further, by increasing the rigidity of the left connecting portion 61, the load F2 applied from the side of the vehicle body is efficiently transmitted to the rear cross member 14 through the left connecting portion 61 and also transmitted to the left floor frame 12 and the left rear floor frame 15. be able to.
Further, by ensuring a large overlap margin T (see FIG. 9B) between the bottom portion 56a of the front end portion 15a and the bottom portion 36a of the rear end portion 12a, the load F2 is further applied to the left floor frame 12 and the left rear floor frame 15. Can communicate efficiently.

As shown in FIG. 3, floor panels 16 are placed on the left and right floor frames 12, the rear cross member 14, and the left and right rear floor frames 15 (see FIG. 4 for the right rear floor frame 15).
The floor panel 16 is formed in a substantially rectangular shape in plan view, and a floor bulging portion 21 is provided so as to protrude upward in a substantially front half portion.
The floor bulging portion 21 is formed in a substantially rectangular shape in plan view, so that a space 63 in which the fuel tank 23 can be stored is formed below.

The front cross member 17 is placed on the front end portion 16 b of the floor panel 16 and on the upper surface 21 b of the floor bulge portion 21, and the front cross member 17 is bridged between the left and right side sills 13.
The front cross member 17 is provided in front of the rear cross member 14 in the vehicle body.

As shown in FIG. 10, the front cross member 17 is provided at the front end portion 16 b of the floor panel 16 and on the upper surface 21 b of the floor bulging portion 21, so that the central portion 17 a becomes the upper surface 21 b of the floor bulging portion 21. It is curved upward along.
Since the central portion 17a is curved upward, the central portion 17a can be disposed (lifted) upward so as to be at the high position H3.

Since the central portion 17a of the front cross member 17 is curved upward, the fuel tank 23 can be provided upward.
Thereby, a relatively large space 32 can be secured in the recess 29 of the fuel tank 23, and the exhaust pipe 31 and the like can be suitably disposed in the space 32.

As shown in FIG. 3, the front cross member 17 includes a top portion 66, front and rear side walls 67 bent downward from the front and rear sides of the top portion 66, a front flange 68 bent from the front side wall 67 to the vehicle body front side, and a rear side wall. 67 and a rear flange 68 that is bent toward the rear side of the vehicle body.
The front cross member 17 is formed in a so-called substantially reverse hat shape so as to open downward at the top portion 66, the front and rear side walls 67, and the front and rear flanges 68.

  The front cross member 17 is provided so as to be orthogonal to the left and right floor frames 12 (see also FIGS. 4 and 5).

The front cross member 17 and the left side sill 13 sandwich the left side portion 16 c of the front end portion 16 b of the floor panel 16.
The front cross member 17 and the right side sill 13 sandwich the right side portion 16 d of the front end portion 16 b of the floor panel 16.

  Further, by providing the front cross member 17 in front of the rear cross member 14 in the vehicle body, the front seat 43 can be provided on the front and rear cross members 17 and 14 with bolts 44 as shown in FIGS.

A left side sill 13 is provided on the vehicle body outside (left outside) of the left floor frame 12 and the left rear floor frame 15 and extends in the vehicle body longitudinal direction.
A right side sill 13 is provided on the vehicle body outside (right outside) of the right floor frame 12 and the right rear floor frame 15 (see FIG. 2) and extends in the vehicle longitudinal direction.

As shown in FIGS. 4 and 5, the left and right side sills 13 have left and right sill expansion portions 71.
The left sill inflatable portion 71 projects from the left side sill 13 in the vehicle width direction, thereby being connected to the left end portion (that is, the left cross-sectional enlarged portion) 14a of the rear cross member 14 and the rear of the left floor frame 12. It is connected to the end 12a.

The left sill inflating portion 71 includes a left front sill portion 71a extending in an inclined manner from the connecting portion 73 of the left side sill 13 and the left end portion 17b of the front cross member 17 toward the rear end portion 12a of the left floor frame 12, The rear cross member 14 includes a left rear inclined portion 71b that extends from the left end portion (that is, the left cross-section enlarged portion) 14a toward the left side sill 13 in an inclined manner toward the rear of the vehicle body.
The left front inclined portion 71a is set at an inclination angle θ4 with respect to the front cross member 17.

The right sill expansion part 71 is a member formed symmetrically with the left sill expansion part 71.
That is, the right sill inflating portion 71 includes a right front sill portion 71a that extends from the connecting portion 73 of the right side sill 13 and the right end portion 17b of the front cross member 17 toward the rear end portion 12 of the right floor frame 12 in an inclined manner. The rear cross member 14 includes a right rear inclined portion 71b that extends from the right end portion (that is, the right cross-section enlarged portion) 14a toward the right side sill 13 in an inclined manner toward the rear of the vehicle body.
The right front inclined portion 71a is set at an inclination angle θ4 with respect to the front cross member 17.

Therefore, for example, when the load F3 is applied to the left end portion 17b of the front cross member 17 from the left side of the vehicle body, the applied load F3 can be distributed to the left front inclined portion 71a of the left sill expansion portion 71.
The load dispersed in the left front inclined portion 71a can be transmitted to the rear cross member 14 through the rear end portion 12a of the left floor frame 12 and the left end portion (that is, the left cross-sectional enlarged portion) 14a of the rear cross member 14.

Thereby, when the load F3 is applied to the left end portion 17b of the front cross member 17 from the left side of the vehicle body, the load transmitted to the front cross member 17 can be suppressed.
Therefore, as shown in FIG. 10, the load transmitted to the front cross member 17 can be supported by the front cross member 17 even if the central portion 17 a of the front cross member 17 is curved upward.

Here, the inclination angle θ4 of the left and right front inclined portions 71a with respect to the front cross member 17 is kept small.
Thereby, the load F3 which acted on the left connection part 73 can be efficiently disperse | distributed to the left front inclination part 71a.
Similarly, the load F4 applied to the right connecting portion 73 can be efficiently distributed to the right front inclined portion 71a.

  Even when the load F4 is applied to the right end portion 17a of the front cross member 17 from the right side of the vehicle body, the load transmitted to the front cross member 17 is transmitted to the front cross member 17 in the same manner as when the load F3 is applied from the left side of the vehicle body. Can be supported.

Further, for example, when a load F5 is applied to the left floor frame 12 from the front of the vehicle body, the applied load F5 can be distributed to the left side sill 13 via the left sill inflating portion 71.
Thereby, when the load F5 acts on the left floor frame 12 from the front of the vehicle body, the load transmitted to the left floor frame 12 can be suppressed, and the load transmitted to the left floor frame 12 can be reduced by the left floor frame 12 or the left side sill 13. Can support.

  Even when the load F6 is applied to the right floor frame 12 from the front of the vehicle body, the load F6 transmitted to the right floor frame 12 is transmitted to the right floor frame 12 and the right as in the case where the load F5 is applied to the left floor frame 12. It can be supported by the side sill 13.

Furthermore, when the load F7 acts on the rear portion 71c of the left rear inclined portion 71b from the left side of the vehicle by extending the left rear inclined portion 71b in an inclined shape, the applied load F7 is changed to the left rear inclined portion 71b. After that, it can be distributed to the cross member 14 later.
In addition, when the load F7 acts on the rear portion 71c of the right rear inclined portion 71b from the right side of the vehicle by extending the right rear inclined portion 71b in an inclined shape, the applied load F7 is changed to the right rear inclined portion 71b. After that, it can be distributed to the cross member 14 later.
As a result, the load F7 acting on the rear portion 71c of the left and right rear inclined portions 71b can be suitably supported by the rear cross member 14.

As shown in FIG. 11, the guide rail 19 is provided along the left rear inclined portion 71 b of the left sill expansion portion 71.
The guide rail 19 is provided on the upper portion 75 a of the lower rail bag body 75. An upper portion 75 a of the lower rail bag body 75 is provided on an upper portion 71 d of the left sill inflating portion 71.
In this state, the guide rail 19 is provided along the left rear inclined portion 71b of the left sill expansion portion 71 (see FIG. 4).

The guide rail 19 is a rail that guides the roller 76 of the slide door 18 (see also FIG. 1) so as to be slidable in the longitudinal direction of the vehicle body.
Thus, the left rear inclined portion 71b is reinforced by the guide rail 19 by providing the guide rail 19 along the left rear inclined portion 71b.

Therefore, the guide rail 19 of the slide door 18 can also be used as a reinforcing member for the left rear inclined portion 71b.
Thereby, since it is not necessary to provide a dedicated reinforcement member separately, the number of parts can be suppressed and weight reduction can be achieved.

  Next, an example of supporting a load acting on the vehicle body floor structure 10 will be described with reference to FIGS. In FIGS. 12 to 15, the left and right half parts of the vehicle body floor structure 10 are substantially symmetrical members, so an example in which a load is applied to the left half part will be described, and the description of the right half part will be omitted. .

First, an example of supporting a load acting on the left front side frame 11 of the vehicle body floor structure 10 from the front of the vehicle body will be described with reference to FIG.
As shown in FIG. 12, a load F10 acts on the left front side frame 11 from the front of the vehicle body.
A part of the load F10 acting on the left front side frame 11 is transmitted as the load F11 to the left floor frame 12 through the left front side frame 11.

A part of the load F11 transmitted to the left floor frame 12 is transmitted to the left rear floor frame 15 as the load F12 through the left floor frame 12.
The remainder of the load F <b> 11 transmitted to the left floor frame 12 is distributed as the load F <b> 13 to the left rear inclined portion 71 b of the left sill expansion portion 71 and is transmitted to the left side sill 13.

Thus, the load transmitted to the left floor frame 12 can be suppressed by dispersing the load F11 transmitted to the left floor frame 12 as the load F13 on the left rear inclined portion 71b.
Thereby, the load transmitted to the left floor frame 12 can be suitably supported by the left floor frame 12.

  The remainder of the load F10 acting on the left front side frame 11 is transmitted to the left side sill 13 as a load F14 via the left outrigger 34.

Here, as shown in FIG. 5 and FIG. 9B, the bottom 51a of the left cross-sectional enlarged portion 14a, the bottom 56a of the left rear floor frame 15, and the bottom 36a of the left floor frame 12 are joined in an overlapped state. The rigidity of the left connecting portion 61 is increased.
Thus, the load F12 transmitted to the left floor frame 12 can be efficiently transmitted to the left rear floor frame 15 via the left connecting portion 61.

Next, an example of supporting a load acting on the left side sill 13 (a portion corresponding to the left end portion 17b of the front cross member 17) of the vehicle body floor structure 10 from the left side of the vehicle body will be described with reference to FIG.
As shown in FIG. 13, a load F <b> 15 is applied to the connecting portion 73 of the left side sill 13 to which the left end portion 17 b of the front cross member 17 is connected from the left side of the vehicle body.
A part of the load F15 acting on the connecting portion 73 is transmitted to the front cross member 17 as a load F16.

On the other hand, the remainder of the load F15 acting on the connecting portion 73 can be dispersed as the load F17 on the left front inclined portion 71a.
The load 17 distributed to the left front inclined portion 71a can be transmitted to the rear cross member 14 via the rear end portion 12a of the left floor frame 12 and the left end portion (that is, the left cross-sectional enlarged portion) 14a of the rear cross member 14.

Thereby, when the load F15 is applied to the connecting portion 73 of the left side sill 13 from the left side of the vehicle body, the load F16 transmitted to the front cross member 17 can be suppressed.
Therefore, as shown in FIG. 10, even if the center portion 17 a of the front cross member 17 is curved upward, the load F <b> 16 transmitted to the front cross member 17 can be suitably supported by the front cross member 17.

Here, the inclination angle θ4 of the left front inclined portion 71a with respect to the front cross member 17 is kept small.
Therefore, the remainder of the load F15 that has acted on the connecting portion 73 can be efficiently dispersed as the load F17 on the left front inclined portion 71a.

Next, an example of supporting a load acting on the left side sill 13 (the rear part 71c of the left rear inclined portion 71b) of the vehicle body floor structure 10 from the left side of the vehicle body will be described with reference to FIG.
As shown in FIG. 14, a load F20 acts on the rear portion 71c of the left rear inclined portion 71b of the left side sill 13 from the left side of the vehicle.

The load F20 applied to the rear portion 71c is distributed as the load F21 to the rear cross member 14 through the left rear inclined portion 71b.
As described above, when the load F20 acts on the rear portion 71c of the left side sill 13, the load F20 is dispersed as the load F21 on the rear cross member 14, and the dispersed load F21 is suitably supported by the rear cross member 14. Can do.

Next, an example in which a load acting on the left side sill 13 (a portion corresponding to the left end portion 14a of the rear cross member 14) of the vehicle body floor structure 10 from the left side of the vehicle body is supported will be described with reference to FIG.
As shown in FIG. 15, a load F <b> 22 acts on the left side sill 13 in a portion corresponding to the left end portion 14 a of the rear cross member 14 from the left side of the vehicle. The acting load F22 is transmitted to the left end portion 14a of the rear cross member 14 through the left sill inflating portion 71.

  Here, as shown in FIG. 5 and FIG. 9B, the bottom 51a of the left cross-sectional enlarged portion 14a, the bottom 56a of the left rear floor frame 15, and the bottom 36a of the left floor frame 12 are joined in an overlapped state. The rigidity of the left connecting portion 61 is increased.

Therefore, a part of the load F22 transmitted to the left end portion 14a of the rear cross member 14 can be dispersed as the load F24 on the left floor frame 12 through the left connecting portion 61 and also as the load F25 on the left rear floor frame 15. it can.
And the remainder of the load F22 transmitted to the left end part 14a can be efficiently transmitted to the rear cross member 14 as the load F23.

Thus, by distributing the load F22 acting on the left side sill 13 to the left floor frame 12 and the left rear floor frame 15, the load F23 acting on the rear cross member 14 can be suppressed.
As a result, the load F23 acting on the rear cross member 14 can be suitably supported by the rear cross member 14.

In addition, the vehicle body floor structure 10 according to the present invention is not limited to the above-described embodiment, and can be changed or improved as appropriate.
For example, in the above-described embodiment, the example in which the guide rail 19 is provided along the left rear inclined portion 71b by providing the lower rail bag body 75 on the upper portion 71d of the left sill inflating portion 71 has been described. It is also possible to provide it along the inclined portion 71b.

  Also, the left and right front side frames 11, left and right floor frames 12, left and right side sills 13, rear cross members 14, left and right cross-sectional enlarged portions 14a, left and right rear floor frames 15, floor panels 16, and front crosses shown in the above-described embodiment. Member 17, front cross member central portion 17a, slide door 18, guide rail 19, floor bulging portion 21, left and right sill inflating portions 71, left and right front inclined portions 71a, left and right rear inclined portions 71b, and left and right connecting portions The shape and configuration such as 73 are not limited to those illustrated, but can be changed as appropriate.

  The present invention is suitable for application to a vehicle having a vehicle body floor structure in which a fuel tank is provided in a space between front and rear cross members and between left and right floor frames.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle body floor structure, 11 ... Left and right front side frame, 11a ... Rear end part of left and right front side frame, 12 ... Left and right floor frame, 12a ... Rear end part of left and right floor frame, 13 ... Left and right side sills, 14 ... Rear cross member, 14a ... Left and right end portions (left and right cross-sectional enlarged portions), 15 ... Left and right rear floor frames, 15a ... Front end portions of the left and right rear floor frames, 16 ... Floor panel, 16b ... Front end portion of the floor panel, 16c ... Left side of the floor panel, 16d ... Right side of the floor panel, 17 ... Front cross member, 17a ... Center part of the front cross member, 18 ... Slide door, 19 ... Guide rail, 21 ... Floor bulge part, 21a ... Rear end portion of floor bulge portion, 21b ... upper surface of floor bulge portion, 51a ... bottom portion of left and right cross-sectional enlarged portions, 71 ... left and right sill expansion portions Front inclined portion of 71a ... right, 71b ... inclined portion after the right and left, 73 ... connecting portions of the left and right.

Claims (4)

Left and right floor frames extending toward the rear of the vehicle body from the rear ends of the left and right front side frames;
Left and right side sills provided on the outside of the left and right floor frames and extending in the longitudinal direction of the vehicle body;
Cross member after being spanned over the left and right side sills,
A floor panel that is placed on the rear cross member and the left and right floor frames and has a raised floor bulge that can accommodate a fuel tank from below;
A front cross member provided in front of the rear cross member in a vehicle body and provided on the left and right side sills and above the rear end portions of the left and right front side frames ;
The rear cross member is provided on a lower surface of a rear end portion of the floor bulge portion, and the front cross member is provided on an upper surface of a front end portion of the floor bulge portion;
The left and right floor frames extend upward from the rear ends of the left and right front side frames to the rear end of the floor bulge portion toward the rear of the vehicle body, and the rear end portions of the left and right floor frames Is provided on the rear cross member,
The front cross member is
The center portion is curved upward along the upper surface of the floor bulging portion by being provided on the front end portion of the floor panel and on the upper surface of the floor bulging portion, and with respect to the left and right floor frames. The front cross member is provided to be orthogonal,
The left side portion of the floor panel is sandwiched between the front cross member and the left floor frame, and the right side portion of the floor panel is sandwiched between the front cross member and the right floor frame,
The rear cross member is
The bottom part of the left and right end parts is formed in a downward slope toward the outside of the vehicle body, so that the left and right end parts are each formed in a cross-sectional enlarged part, and the central part is arranged at a high position,
A vehicle body floor structure , wherein rear end portions of the left and right floor frames are connected to the left and right cross-sectional enlarged portions, and a space in which a fuel supply pipe of the fuel tank can be disposed is secured in the central portion . The left and right rear floor frames extend from the left and right cross-sectional enlarged parts of the rear cross member toward the rear of the vehicle body,
A front end portion of the left rear floor frame and a rear end portion of the left floor frame are joined in a state of being overlapped with a bottom portion of the left cross-sectional enlarged portion,
The right rear rear end of the front end and the right floor frame of the floor frame, vehicle body floor structure of claim 1, wherein said joined in a state of being superposed on the bottom of the right cross-section enlarged portion. The left and right side sills are
By projecting inward in the vehicle width direction, it is connected to the left and right ends of the rear cross member, and has left and right sill inflated portions connected to the rear ends of the left and right floor frames,
The left sill expansion part is
The left side sill and the front cross member has a left front inclined portion extending in an inclined manner from a connecting portion of the left end portion of the front cross member toward the rear end portion of the left floor frame,
The right sill expansion part is
The right side sill and the claims, characterized in that it has the front right front inclined portion extending from the connecting portion of the right end portion inclined towards the rear end of the right floor frame cross member 1 or claim 2 Body floor structure as described. The left sill expansion part is
Having a left rear inclined portion extending in an inclined manner from the left end portion of the rear cross member toward the left side sill;
The right sill expansion part is
A right rear inclined portion extending in an inclined manner from the right end portion of the rear cross member toward the right side sill;
A guide rail that slidably guides a sliding door is provided along at least one of the left and right rear inclined portions, and at least one of the left and right rear inclined portions is reinforced by the guide rail. Item 3. The vehicle body floor structure according to Item 3 .

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