JP2004060530A - Body mounting structure of canister - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a body mounting structure of a canister capable of assuring an installation space for the canister increased in size without affecting the layout of an existing vehicle and preventing a fuel tank from being remarkably asymmetrically arranged in lateral direction. <P>SOLUTION: A canister installation part to store the canister 24 is recessedly formed in the fuel tank 16 at the front face thereof. The front end face of the canister installed at the canister installation part of the fuel tank is positioned on the body rear side of the front end face of the fuel tank. The fuel tank is suspendedly installed on the lower surface side of a rear floor panel 13 higher by one stage than a front floor panel 11 facing the longitudinal direction of the body. The longitudinal, lateral, and vertical directions of the canister are closed by any one of the fuel tank, a rear floor panel, and a rear floor vertical wall part 12 formed by connecting the front floor panel and the rear floor panel. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a canister body mounting structure.
[0002]
[Problems to be solved by the invention]
2. Description of the Related Art Conventionally, an automobile is equipped with a canister for temporarily storing fuel evaporative gas (gasoline vapor) discharged into the atmosphere from a fuel storage system and a supply system and burning the fuel evaporative gas according to the load state of an engine. I have.
Such canisters are often arranged in the engine room, but are mounted around the fuel tank at the rear of the vehicle body with the increase in canister capacity in accordance with the emission regulations and ensuring the safety of collision.
However, in this conventional body mounting structure of a canister, if the canister is arranged in parallel with the fuel tank, the trunk space and the cargo space are reduced in order to secure an arrangement space for the enlarged canister. Not only is there a problem, but there is also a risk that the canister is damaged by the flying stones jumped up by the wheels.
[0003]
In order to solve such a problem, in particular, in consideration of the restrictions on the press forming of the fuel tank made of sheet metal, the canister mounting position 2 is formed in the upper surface of the fuel tank 1 as shown in FIG. Then, by disposing the canister 3 therein, the canister 3 may be integrated with the upper surface of the fuel tank 1 to secure a mounting space for the canister 3 while protecting the canister 3 from stepping stones.
However, when such a method is adopted, the canister 3 must be mounted on the fuel tank 1 on the opposite side of the fuel pump 4 in order to avoid interference with the fuel pump 4 mounted on the upper surface of the fuel tank 1. Therefore, there is a problem that the fuel tank 1 is significantly asymmetrical. In the fuel tank 1 which is significantly asymmetric, the capacity balance in the tank is lost, so that a plurality (for example, three) of fuel cut valves 5 for sending only the fuel evaporative gas generated in the tank to the canister 3 are provided. If necessary, the transfer line 7 between the separator 6 and the transfer line 7 is increased and complicated, thereby increasing the production cost.
Further, if the drain canister 8 is attached to the rear end side of the fuel pump 4, there is a problem that the front-rear length of the fuel tank 1 is increased.
[0004]
Therefore, the present invention has been made to solve the above-mentioned problems of the conventional canister body mounting structure, and has been made larger without affecting the existing vehicle layout. It is an object of the present invention to provide a canister body mounting structure that can secure a mounting space for a canister and that does not significantly asymmetrical the fuel tank.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to claim 1, a canister for temporarily storing fuel evaporative gas discharged into the atmosphere from a fuel tank or a fuel supply system and burning it in accordance with the load state of the engine In the body mounting structure of
The fuel tank is characterized in that a canister mounting portion for recessing the canister is formed in the front side of the fuel tank, and the canister is mounted on the canister mounting portion of the fuel tank.
[0006]
According to a second aspect, a front end surface of the canister attached to the canister mounting portion of the fuel tank according to the first aspect is located on a vehicle rear side with respect to a front end surface of the fuel tank. Features.
[0007]
In the third aspect, the fuel tank according to the first or second aspect is suspended from a lower surface side of a rear floor panel that is one step higher than a front floor panel facing a vehicle front-rear direction, and the canister Is characterized in that its front, rear, left and right directions are closed by any one of the fuel tank, the rear floor panel, and a rear floor standing wall connecting the front floor panel and the rear floor panel.
[0008]
According to a fourth aspect of the present invention, a drain canister mounting portion for accommodating a drain canister is provided on the front side of the fuel tank according to any one of the first to third aspects, and is integrally formed with the canister mounting portion so as to be integrally recessed. It is characterized by being.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment which is considered to be the most preferable of the present invention will be described in detail with reference to FIGS. FIG. 1 is an overall configuration diagram for explaining an outline of a vehicle body mounting structure of a canister of the present invention, FIG. 2 is a perspective view around a fuel tank in the same example, FIG. 3 is a plan view of a fuel tank in the same example, FIG. 4 is an explanatory diagram for explaining a mounting state of the fuel tank and the canister in the same example.
[0010]
As shown in FIGS. 1 to 4, the floor panel 10 of the vehicle is disposed on a pair of left and right side frames (not shown) extending in the vehicle longitudinal direction, and is substantially horizontal extending in the vehicle longitudinal direction. At the rear end of the front floor panel 11, a rear floor standing wall portion 12 extending upward by a predetermined distance is formed. Further, the upper end portion of the rear floor standing wall portion 12 is substantially horizontal toward the rear of the vehicle body. The rear floor panel 13 is formed to extend. Therefore, the rear floor panel 13 is provided with a ground clearance one step higher than the front floor panel 11.
[0011]
On the upper surface side of the rear floor panel 13, as shown by a two-dot chain line in FIG. 1, a rear seat (second, third) in which the front end portion of the seat cushion 14 substantially coincides with the vertical surface of the rear floor standing wall portion 12. 15 (including a sheet). A fuel tank 16 is arranged on the lower surface side of the rear floor panel 13 below the rear seat 15, and a mounting bracket 17 for stiffening and supporting the fuel tank is mounted at a position sandwiching the fuel tank 16 from the front and rear. And a plurality of mounting bands 19 having front and rear ends fixed to a cross member 18 having a hat-shaped cross section.
[0012]
The fuel tank 16 may be made of sheet metal as in the prior art, but is preferably made of synthetic resin in consideration of the restrictions on press molding of the sheet metal fuel tank, and is suspended below the rear floor panel 13. In the retracted state, the dimensions are set so as to be substantially accommodated under the rear seat 15 and to be higher than the front floor panel 11 above the ground.
[0013]
A connection port 20 is provided on one side of the fuel tank 16 (the left side of the vehicle body in FIG. 2) to which a filler pipe for guiding fuel supplied from a fuel supply port into the tank is connected. .
Further, at the four front, rear, left and right corners of the upper surface of the fuel tank 16, projections 21 to 21 projecting upward and having a substantially rectangular shape in plan view are formed, and these projections 21 to 21 When the tank 16 is suspended below the rear floor panel 13, the tank 16 is joined to the lower surface of the rear floor panel 13 to prevent rattling when the fuel tank 16 is mounted and fixed. A delivery hose for transferring fuel from a fuel pump housed in the tank to the engine side is provided on the upper surface of the lower fuel tank 16 in which a clearance from the rear floor panel 13 is ensured by the projections 21 to 21. Various hoses 22 such as a return hose for returning surplus fuel from the engine side into the tank are attached, and a fuel cut valve 23 for passing only the evaporated fuel gas is attached at the center of the upper surface thereof. I have. An air chamber in which a fuel separator is incorporated is formed above the tank to which the fuel cut valve 23 is attached, and the evaporated fuel gas liquefied in the air chamber is returned to the tank.
[0014]
At the front of the fuel tank 16, that is, at the center of one of the side surfaces opposed to the rear floor standing wall portion 12, the canister 24 is recessed so as to fit into the horizontally long canister 24 without protruding forward from its front end surface. The formed canister mounting portion 25 is formed. A plurality of canister mounting members 26 having legs directed forward are integrally welded to the canister mounting portion 25 at a position one step deeper from the front end surface. Therefore, the canister 24 is inserted into the bolt hole 28 of the flange 27 provided at the left and right end portions of the canister 24, and is fixed by the fixing bolt 30 screwed together with the flange 27 to the nut 29 which is prevented from being removed by the canister mounting member 26. The fuel tank 16 is securely attached to the fuel tank 16 without deteriorating the degree of sealing. The canister 24 transfers the fuel gas in the tank that has reached a predetermined pressure through the transfer pipe 31 connected to the fuel cut valve 23, and temporarily adsorbs the activated carbon filled in the canister. Let it.
[0015]
Further, a drain canister mounting portion 34, which is recessed so as to receive the drain canister 33 without protruding forward from the front end surface of the fuel tank 16, is provided alongside the canister mounting portion 25. Is formed. The drain canister 33 is mounted on the drain canister mounting portion 34 in the same manner as the canister 24. Note that the drain canister mounting portion 34 is preferably formed below the front surface of the fuel tank 16 so as to minimize the left-right symmetry of the fuel tank 16.
[0016]
The drain canister 33 filters the outside air sucked from an opening (not shown), and then transfers the filtered outside air to the canister 24 via the outside air pipe 35, and also removes the HC component from the evaporated fuel gas in the canister that has reached a predetermined pressure. After removal, they are released to the atmosphere. Therefore, the evaporative fuel gas stored in the canister 24 is separated from the activated carbon by the outside air drawn into the canister via the drain canister 33 in accordance with the engine load, and then from the evaporative line 32 to the engine side. It is transferred and burned.
[0017]
Thus, according to the canister body mounting structure of the present invention, the canister 24 and the drain canister 33 can be mounted on the front side of the fuel tank 16 without protruding forward from the front end face of the tank. The part 25 and the drain canister mounting part 34 are integrally formed so as to be integrally recessed. The canister 24 mounted on the canister mounting portion 25 has the rear floor standing wall portion 12 disposed on the front side thereof, and the upper portion is closed by the rear floor panel 13, and the fuel tanks 16 are disposed rearward and left and right sides. Is closed by Furthermore, the drain canister 33 accommodated in the drain canister mounting portion 34 has a similar mode.
[0018]
Therefore, the canister 24 can be attached to the body of the vehicle together with the fuel tank 16 without reducing the trunk space or the cargo space. Can be easily dealt with. Moreover, since no significant changes are made to the floor panel 10, it is possible to realize it at low cost. Further, since the canister 24 and the drain canister 33 can be attached to the fuel tank 16 without significantly impairing the left-right symmetry of the fuel tank 16, it is possible to cope with the minimum necessary fuel cut valve 23 and to reduce the manufacturing cost. Can be achieved.
Further, the canister 24 is closed in one of the rear floor standing wall portion 12, the rear floor panel 13, and the fuel tank 16 in the front, rear, left, and right directions except for the downward direction, thereby preventing damage to the canister 24 due to stepping stones. be able to. Furthermore, since the drain canister 33 can be mounted in the fuel tank 16 together with the canister 24 in advance, the fuel storage system can be modularized, and the mounting work process at the time of assembling the vehicle body can be shortened, thereby improving work efficiency. Can also be planned.
[0019]
According to the present embodiment, the canister 24 and the drain canister 33 are mounted on the front surface of the fuel tank 16. However, the present invention is not limited to this embodiment. The mounting portions 25 ′ and 34 ′ for accommodating the canister 24 and the drain canister 33 may be recessed, and the canister 24 and the drain canister 33 may be mounted therein. According to this, in addition to obtaining substantially the same operation and effect as the above-described embodiment, in particular, the length of the evaporative piping of the RR vehicle (rear engine rear drive vehicle) is shortened, and the combustion of the fuel evaporative gas is reduced. Optimization and efficiency can be achieved.
[0020]
【The invention's effect】
As described above, according to the canister body mounting structure of the present invention, it is possible to secure a mounting space for a canister that is increased in size without affecting the existing vehicle layout, and to significantly increase the fuel tank size. It is possible to provide a canister body mounting structure that is not left-right asymmetric.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram for describing an outline of a vehicle body mounting structure of a canister according to the present invention.
FIG. 2 is a perspective view around a fuel tank in the same example.
FIG. 3 is a plan view of a fuel tank in the same example.
FIG. 4 is an explanatory diagram for explaining a mounting state of a fuel tank and a canister in the same example.
FIG. 5 is a plan view for explaining a conventional canister body mounting structure.
[Explanation of symbols]
11 Front Floor Panel 12 Rear Floor Standing Wall 13 Rear Floor Panel 16 Fuel Tank 24 Canister 25 Canister Attachment 33 Drain Canister 34 Drain Canister Attachment

Claims (4)

In the body mounting structure of the canister, which temporarily stores the fuel evaporative gas discharged into the atmosphere from the fuel tank and the fuel supply system and burns it according to the load condition of the engine,
A canister mounting structure in which a canister mounting portion for recessing the canister is formed in the front side of the fuel tank, and the canister is mounted on the canister mounting portion of the fuel tank. The vehicle body mounting structure for a canister according to claim 1, wherein a front end surface of the canister mounted on the canister mounting portion of the fuel tank is located rearward of the vehicle body with respect to a front end surface of the fuel tank. . The fuel tank is suspended from a lower surface of a rear floor panel that is one step higher than a front floor panel facing the vehicle front-rear direction, and the canister has front, rear, left, and right upper directions, the fuel tank and the rear floor panel. The canister body mounting structure according to claim 1 or 2, wherein the canister is closed by one of a rear floor standing wall portion connecting the front floor panel and the rear floor panel. The drain canister mounting part for accommodating a drain canister is formed in the front surface side of the said fuel tank, and it is formed integrally with the said canister mounting part, and it is formed in one and concaved. Canister body mounting structure.

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