JP5501808B2 - Lower body structure - Google Patents

Description

  The present invention relates to a vehicle body lower structure. Specifically, the present invention relates to a vehicle body lower structure suitable for a hybrid vehicle.

  In recent years, a hybrid vehicle (HEV) equipped with an engine and a drive motor and driving the drive motor with a battery has been put into practical use. In a normal hybrid vehicle, the battery is disposed at the rear of the vehicle body (see, for example, Patent Document 1). In addition, the hybrid vehicle is provided with an air duct that communicates the battery and the vehicle interior and introduces air in the vehicle interior to cool the battery.

JP 2000-247157 A

  By the way, an air duct is arrange | positioned in the position which is hard to receive the influence of external temperature so that the cooling effect may not be inhibited. Specifically, the air duct is disposed on the upper surface of the floor tunnel so as to extend in the longitudinal direction of the vehicle body. However, when this layout is adopted, the position of the rear seat disposed above the floor tunnel is increased by the height of the air duct, and thus there is a problem that the interior space of the vehicle is reduced.

  The present invention has been made in view of the above, and an object of the present invention is to provide a vehicle body lower structure capable of expanding a vehicle interior space by improving the package efficiency of the vehicle body lower structure and making it compact. .

In order to achieve the above object, a vehicle body lower structure (for example, a vehicle body lower structure 10 described later) according to the present invention has a vehicle width direction central portion of a floor panel (for example, a floor panel 11 described later) provided below the seat. A floor tunnel (for example, a floor tunnel 12 described later) formed by bulging upward and extending in the longitudinal direction of the vehicle body, a battery (for example, a battery described later) provided at the rear of the vehicle body, and extending in the longitudinal direction of the vehicle body An air duct (for example, air duct 13 to be described later) that communicates the battery with the vehicle interior and introduces air in the vehicle interior to the battery, and a fuel tank (for example, to be described later ) provided below the floor tunnel. Fuel tank 14) and a canister (for example, a later-described canister) that is provided behind the fuel tank and adsorbs the evaporated fuel generated in the fuel tank. 15) and an evaporative fuel passage (for example, an evaporative fuel passage 16 to be described later) that extends in the longitudinal direction of the vehicle body, communicates the fuel tank and the canister, and introduces evaporative fuel generated in the fuel tank into the canister. And a concave portion (for example, a concave portion 121 described later) extending in the vehicle front-rear direction is formed on the upper surface of the floor tunnel, and the air duct is disposed in the concave portion. The cross-sectional shape of the portion composed of the floor tunnel and the air duct when cut in the vehicle width direction is an isosceles trapezoidal shape, and the evaporated fuel passage is a portion where the recess is not provided (for example, a recess described later) is provided in a floor tunnel in the upper portion 122) is not provided, they are arranged in parallel to the air duct in the vehicle width direction, characterized in Rukoto.

In the present invention, a recess extending in the longitudinal direction of the vehicle body is provided on the upper surface of the floor tunnel, and an air duct is disposed in the recess.
As a result, the air duct and the floor tunnel are packaged, and the package efficiency of the lower body structure can be improved. Compared to the case where an air duct is placed on the upper surface of a floor tunnel that is not provided with a recess as in the conventional case, the height of the lower body structure can be lowered by the height of the air duct, making the lower body structure more compact. it can. For this reason, the height position of the hip point of the rear seat, particularly the center seat, can be lowered by the height of the air duct. Therefore, the vehicle interior space can be expanded, and the degree of freedom in the layout of the vehicle interior can be increased.

In this invention, the air duct is disposed in the recess, and the evaporated fuel passage is provided in the upper portion of the floor tunnel where the recess is not provided, so that the air duct and the evaporated fuel passage are disposed in parallel in the vehicle width direction. It was.
Here, normally, in a hybrid vehicle, the fuel tank is arranged below the floor tunnel, and the canister is arranged behind the fuel tank. Further, the evaporative fuel passage that communicates between the fuel tank and the canister is arranged at a certain height position in order to prevent the introduction of the evaporative fuel due to the occurrence of the liquid pool. Specifically, the fuel vapor passage is arranged to extend in the longitudinal direction of the vehicle body above the floor tunnel.
For this reason, conventionally, when the height of the floor tunnel is lowered in order to expand the vehicle interior space, the height position of the evaporative fuel passage is also lowered, resulting in a liquid pool in the evaporative fuel passage, There was a problem that it was difficult to adsorb evaporated fuel by the canister. In this respect, according to the present invention, the height of the vehicle body lower structure can be lowered without lowering the height position of the evaporated fuel passage. Therefore, the vehicle body lower structure can be made compact and the vehicle interior space can be expanded while avoiding the introduction of the evaporated fuel into the canister being hindered by the occurrence of the liquid pool.

  Moreover, in this invention, it is preferable that the said air duct is fitted and arrange | positioned at the said recessed part.

In the present invention, the air duct is disposed so as to be fitted into the recess provided on the upper surface of the floor tunnel.
Thereby, a vehicle body lower part structure can be made more compact and the effect of the said invention can be heightened.

  In addition, the upper surface of the portion of the floor tunnel where the concave portion is not provided (for example, the portion 122 where the concave portion described later is not provided) and the upper surface of the air duct disposed in the concave portion are both substantially horizontal. It is preferable that they are located at substantially the same height.

In the present invention, the upper surface of the portion of the upper surface of the floor tunnel where no recess is provided and the upper surface of the air duct disposed in the recess are substantially horizontal and have substantially the same height.
Thus, conventionally, the rear seat is supported by the upper surface of the air duct. According to the present invention, the rear seat is formed by the upper surface of the air duct and the upper surface of the portion of the upper surface of the floor tunnel where no recess is provided. I can support it. Therefore, the air duct can be prevented from being crushed by the weight of the passenger on the rear seat, particularly the center seat.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle body lower structure which can expand vehicle interior space can be provided by improving the package efficiency of a vehicle body lower structure and making compact.

It is a top view of the lower body structure concerning one embodiment of the present invention. It is a left view of the vehicle body lower part structure concerning the said embodiment. It is a schematic diagram of the AA line cross section of FIG. It is a top view of the conventional vehicle body lower part structure. It is a left view of the conventional vehicle body lower part structure. It is a schematic diagram of the BB line cross section of FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view of a vehicle body lower structure 10 according to an embodiment of the present invention. FIG. 2 is a left side view of the vehicle body lower structure 10. FIG. 3 is a schematic diagram of a cross section taken along line AA of FIG. In FIG. 1, “Fr” represents the front of the vehicle body, “Rr” represents the rear of the vehicle body, “R” represents the right direction viewed from the driver, and “L” represents the left direction viewed from the driver. In FIG. 2, for convenience of explanation, the description of the vehicle body frame 100 is omitted, and only the floor panel 11 is shown as a cross-section when the concave portion 121 is cut along a substantially center line in the vehicle width direction.

A vehicle body lower structure 10 according to an embodiment of the present invention is a vehicle body lower structure applied to a rear portion of a hybrid vehicle. The vehicle body lower structure 10 is disposed on the vehicle body frame 100 with the vehicle body frame 100 as its basic configuration.
As shown in FIG. 1, the vehicle body frame 100 includes left and right side sills 101, 101 extending in the longitudinal direction of the vehicle body, a rear floor frame 103 extending between the side sills 101, 101 and extending in the vehicle width direction, and left and right side sills. 101, 101 includes rear left and right rear side frames 105, 105 extending rearward of the vehicle body, and a middle cross member 107 extending between the left and right rear side frames 105, 105 and extending in the vehicle width direction.

  The vehicle body lower structure 10 includes a floor panel 11, a floor tunnel 12, a battery (not shown), an air duct 13, a fuel tank 14, a canister 15, and an evaporated fuel passage 16.

The floor panel 11 is provided below the seat and constitutes a floor portion of the passenger compartment. Specifically, the floor panel 11 is formed to be stretched between the left and right side sills 101, 101 and is surrounded by the left and right side sills 101, 101, the rear floor frame 103, the left and right rear side frames 105, 105, and the middle cross member 107. Provided in the area.
A rear seat (not shown) is disposed above the floor panel 11. In particular, a center sheet is arranged in a region surrounded by X in FIG.

The floor tunnel 12 is a long and narrow tunnel extending in the vehicle longitudinal direction from a dashboard lower (not shown) to the middle cross member 107 and penetrating through the center in the vehicle width direction. The floor tunnel 12 is formed by the center portion in the vehicle width direction of the floor panel 11 bulging upward. The floor tunnel 12 improves the rigidity of the floor panel 11.
On the upper surface of the floor tunnel 12, a recess 121 extending in the longitudinal direction of the vehicle body is provided. The recess 121 is provided on the left side of the upper surface of the floor tunnel 12, and the air duct 13 described later is disposed in the recess 121. The shape of the floor tunnel 12, particularly the recess 121, will be described in detail later.

  A battery (not shown) is disposed at the rear of the vehicle body and drives a drive motor provided in front of the vehicle body (not shown). A lithium ion secondary battery is used as the battery.

  The air duct 13 communicates the battery and the passenger compartment, and introduces the air in the passenger compartment having a stable temperature into the battery. Thereby, the battery is cooled. The air duct 13 extends in the longitudinal direction of the vehicle body and is disposed in a recess 121 provided on the upper surface of the floor tunnel 12. The arrangement of the air duct 13 will be described in detail later.

As shown in FIG. 2, the fuel tank 14 is provided below the floor tunnel 12. The fuel tank 14 is arranged such that its longitudinal direction is perpendicular to the longitudinal direction of the vehicle body and the center of the longitudinal direction is located at the center of the vehicle body in the width direction.
A fuel supply port (not shown) is provided on the upper surface of the fuel tank 14, and fuel is supplied to the engine from the fuel supply port by the driving force of a fuel pump (not shown).
An upper space is formed in the fuel tank 14 between the liquid level and the ceiling wall of the fuel tank 14. The upper space and a canister 15 described later are communicated with each other by an evaporative fuel passage 16 described later via a fuel tank opening 141 and a float valve 142 provided on the upper surface of the front portion of the fuel tank 14. The float valve 142 is closed when the liquid level in the fuel tank 14 reaches a predetermined height, thereby preventing the liquid fuel from flowing into the evaporated fuel passage 16.

The canister 15 is provided on the rear upper side of the fuel tank 14 and is attached to the rear end portion of the fuel tank 14 by a canister bracket (not shown). As described above, the canister 15 communicates with the upper space in the fuel tank 14 through the evaporated fuel passage 16 described later. The canister 15 is filled with activated carbon pellets as an adsorbent for the evaporated fuel, and the evaporated fuel introduced through the evaporated fuel passage 16 is adsorbed by the adsorbent and temporarily held. The
Further, an intake pipe connection port (not shown) is provided at the front portion of the canister 15 via a purge valve for purge control, and an air filter having an air release port (not shown) is provided at the rear portion thereof. When the purge valve is opened, the atmosphere is introduced from the atmosphere opening through the air filter into the canister 15, whereby the evaporated fuel temporarily held in the adsorbent is desorbed and passes through the intake pipe. Guided to the combustion chamber.

As described above, the evaporated fuel passage 16 extends in the longitudinal direction of the vehicle body, communicates the upper space in the fuel tank 14 and the canister 15, and introduces the evaporated fuel in the fuel tank 14 into the canister 15.
A valve (not shown) is provided in the middle of the evaporated fuel passage 16 and is opened when the pressure in the fuel tank 14 exceeds a predetermined pressure due to the evaporated fuel generated in the fuel tank 14.
Further, the evaporated fuel passage 16 is provided in the upper portion of the floor tunnel 12 in the portion 122 where the recess 121 is not provided in the upper surface of the floor tunnel 12. Further, as shown in FIG. 2, the evaporated fuel passage 16 is arranged in parallel with the air duct 13 in the vehicle width direction. The evaporative fuel passage 16 needs to be arranged at a certain height so that the introduction of the evaporative fuel to the canister 15 is not hindered by the occurrence of a liquid pool, which will be described in detail later.

Next, the shape of the floor tunnel 12, in particular, the recess 121, and the arrangement of the air duct 13 and the evaporated fuel passage 16 will be described in detail with reference to FIG.
As shown in FIG. 3, the floor tunnel 12 has a cross-sectional shape when cut in the vehicle width direction in which the upper left part of the isosceles trapezoidal shape is cut out into a parallelogram shape. Further, the floor tunnel 12 is provided with a concave portion 121 extending in the longitudinal direction of the vehicle body on the left side of the upper surface thereof, so that the portion 122 where the concave portion 121 is not provided forms a convex portion protruding upward. The height of the upper surface of the portion 122 where the concave portion 121 is not provided is the same height as the upper surface of the conventional floor tunnel 52 described later, and the cross-sectional shape of the portion when cut in the vehicle width direction is, for example, It is a leg trap shape.
In addition, the position, shape, and size of the recess 121 are appropriately set according to the position, shape, and size of the air duct 13 and the evaporated fuel passage 16.

  The air duct 13 extending in the longitudinal direction of the vehicle body has a parallelogram shape when cut in the vehicle width direction, and this cross-sectional shape matches the notch shape of the floor tunnel 12. For this reason, the air duct 13 is fitted and disposed in the recess 121, and the air duct 13 and the floor tunnel 12 are packaged. Further, the upper surface of the air duct 13 and the upper surface of the portion 122 where no recess is provided are both substantially horizontal, and they are flush with each other at substantially the same height.

  The evaporative fuel passage 16 is a large-diameter cylindrical tube extending in the longitudinal direction of the vehicle body, and has a circular cross-sectional shape when cut in the vehicle width direction. The evaporative fuel passage 16 is provided above the floor tunnel 12 in the portion 122 where the recess 121 is not provided, and is arranged in parallel with the air duct 13 in the vehicle width direction. Further, the air duct 13 and the evaporated fuel passage 16 are disposed so as to overlap in the height direction. Thereby, the package efficiency is further improved.

4-6 is a figure which shows the conventional vehicle body lower structure 50 corresponding to FIGS. 1-3, respectively. Except for the differences in the configuration of the floor tunnel 52, the air duct 53, and the evaporated fuel passage 56, the configuration is the same as that of the vehicle body lower structure 10 according to the present embodiment, and thus the description of the common configuration is omitted.
As shown in FIGS. 4 to 6, the conventional lower body structure 50 has no recess on the upper surface of the floor tunnel 52, and the entire upper surface is horizontal. On this upper surface, an air duct 53 having a width dimension substantially equal to the width of the upper surface and a substantially rectangular cross section is disposed in contact. When the floor tunnel 52 is cut in the vehicle width direction, the cross-sectional shape is an isosceles trapezoidal shape, and the evaporated fuel passage 56 is disposed above the floor tunnel 52 in order to suppress liquid pooling. In addition, the air duct 53 and the evaporated fuel passage 56 are disposed so as to overlap each other at the approximate center in the vehicle width direction.

  As described above, the vehicle body lower structure 10 according to the present embodiment is greatly different from the conventional vehicle body lower structure 50 in the shape of the floor tunnel 12 and the arrangement of the air duct 13 and the evaporated fuel passage 16, and is based on the difference in the structure. Thus, according to the vehicle body lower structure 10 according to the present embodiment, the following effects are exhibited.

First, in the present embodiment, a recess 121 extending in the longitudinal direction of the vehicle body is provided on the upper surface of the floor tunnel 12, and the air duct 13 is disposed in the recess 121.
Thereby, the air duct 13 and the floor tunnel 12 are packaged, and the package efficiency of the vehicle body lower structure 10 can be improved. Further, the height of the vehicle body lower structure 10 can be reduced by the height of the air duct 13 compared to the conventional case where the air duct 13 is arranged on the upper surface of the floor tunnel not provided with the recess 121. 10 can be made more compact. For this reason, the height position of the hip point of the rear seat, particularly the center seat, can be lowered by the height of the air duct 13. Therefore, the vehicle interior space can be expanded, and the degree of freedom in the layout of the vehicle interior can be increased.

In the present embodiment, the air duct 13 is disposed in the recess 121, and the evaporated fuel passage 16 is provided in the upper portion of the floor tunnel 12 of the portion 122 where the recess 121 is not provided, so that the air duct 13 and the evaporated fuel passage 16 are connected to each other. They were arranged so as to be positioned in parallel in the width direction.
As described above, in the conventional vehicle body lower structure 50, the fuel tank 54 is disposed below the floor tunnel 52, and the canister 55 is disposed above the fuel tank 54. Further, the evaporative fuel passage 56 that communicates between the fuel tank 54 and the canister 55 is arranged at a certain height position in order to prevent the introduction of the evaporative fuel due to the occurrence of the liquid pool. Specifically, the evaporated fuel passage 56 is arranged to extend in the longitudinal direction of the vehicle body above the floor tunnel 52.
For this reason, conventionally, when the height of the floor tunnel 52 is lowered in order to enlarge the vehicle interior space, the height position of the evaporated fuel passage 56 is also lowered, so that a liquid pool is formed in the evaporated fuel passage 56. There is a problem that it becomes difficult to adsorb the evaporated fuel by the canister 55. In this regard, according to the present embodiment, the height of the vehicle body lower structure 10 can be lowered without lowering the height position of the evaporated fuel passage 16. Therefore, the vehicle body lower structure 10 can be made compact and the vehicle interior space can be expanded while avoiding the introduction of the evaporated fuel into the canister 15 being hindered by the occurrence of the liquid pool.

Further, in the present embodiment, the air duct 13 is arranged so as to fit into the recess 121 provided on the upper surface of the floor tunnel 12.
Thereby, the vehicle body lower structure 10 can be made more compact, and the above effect can be enhanced.

In the present embodiment, the upper surface of the portion 122 where the concave portion 121 is not provided in the upper surface of the floor tunnel 12 and the upper surface of the air duct 13 disposed in the concave portion 121 are substantially horizontal and have substantially the same height. Say it.
As a result, the rear seat is conventionally supported by the upper surface of the air duct 13. According to the present embodiment, the upper surface of the air duct 13 and the upper surface of the portion 122 of the upper surface of the floor tunnel 12 where the recess 121 is not provided. And can support the rear seat. Accordingly, the air duct 13 can be prevented from being crushed by the weight of the passenger on the rear seat, particularly the center seat.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.

DESCRIPTION OF SYMBOLS 10 Car body lower part structure 11 Floor panel 12 Floor tunnel 13 Air duct 14 Fuel tank 15 Canister 16 Evaporative fuel passage 121 Recessed part 122 The part without a recessed part

Claims (3)

A floor tunnel extending in the longitudinal direction of the vehicle body formed by bulging upward in the vehicle width direction of the floor panel provided below the seat; and
A battery provided at the rear of the vehicle body;
An air duct extending in the longitudinal direction of the vehicle body to communicate the battery and the passenger compartment, and introducing air in the passenger compartment into the battery;
A fuel tank provided under the floor tunnel and storing fuel;
A canister that is provided behind the fuel tank and that adsorbs evaporated fuel generated in the fuel tank;
An evaporative fuel passage extending in the longitudinal direction of the vehicle body, communicating the fuel tank and the canister, and introducing evaporative fuel generated in the fuel tank into the canister ,
The upper surface of the floor tunnel is provided with a recess extending in the front-rear direction of the vehicle body by notching one side upper part in the vehicle width direction ,
The air duct is disposed in the recess ;
The cross-sectional shape when cut in the vehicle width direction of the portion consisting of the floor tunnel and the air duct is an isosceles trapezoidal shape,
The evaporative fuel passage, the recess is provided in a floor tunnel in the upper portion is not provided, the vehicle body lower structure according to claim Rukoto disposed in parallel to the air duct in the vehicle width direction. The vehicle body lower structure according to claim 1 , wherein the air duct is disposed to be fitted into the recess. And the upper surface of the recess is not provided portion of the floor tunnel, claim top of the air duct disposed in the recess, with each a substantially horizontal, characterized in that positioned at substantially the same height The vehicle body lower structure according to 1 or 2 .

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