JPH0512240U - Canister arrangement structure in fuel tank - Google Patents

Abstract

(57) [Summary] [Purpose] Minimize the occurrence of dead space and the reduction of fuel tank capacity by arranging the canister reasonably close to the fuel tank. [Structure] A recess 23 is formed in the lower portion of the fuel tank T so as to substantially match the outer shape of the canister C, and the canister C is fitted and held in the recess 23. The right side surface and the lower surface of the canister C are arranged so as to be flush with the outer surface of the fuel tank T, whereby the canister C is integrated with the fuel tank T so as to form a part of the fuel tank T. As a result, the canister C can be mounted without causing a dead space by simply reducing the capacity of the existing fuel tank T by an amount corresponding to the volume of the canister C. The canister C is disposed between the heat shield plate 18 of the exhaust pipe 13 passing near the fuel tank T and the fuel tank T, and the heat shield plate 1 is provided.
In addition to 8, the canister C also prevents heat transfer to the fuel tank T.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a canister mounting arrangement in a fuel tank for reasonably disposing a canister that adsorbs vaporized fuel generated from a fuel tank and prevents the canister from leaking to the atmosphere, in the vicinity of the fuel tank.

[0002]

[Prior Art]

 The fuel tank of an automobile is generally provided in the rear part of the vehicle body, such as the lower part of the rear seat, and fuel is supplied from there to an engine mounted in the front part of the vehicle body. Conventionally, a canister that adsorbs evaporated fuel generated from a fuel tank is provided in an engine room apart from the fuel tank and connected to an intake pipe of the engine.

FIG. 8 shows an outline of the fuel supply system of the conventional vehicle. Fuel drawn from the fuel tank T via the strainer 1 and the fuel pump 2 is fed to the engine E via the feed passage 3. It is supplied to the injection valve 4. The upper space of the fuel tank T and the upstream position of the throttle valve 6 provided in the intake pipe 5 of the engine E are connected by vaporized fuel passages 7 and 8, and a canister C is interposed between the vaporized fuel passages 7 and 8. To be dressed. The canister C has activated carbon 11 housed between the upper and lower filters 9 and 10. The fuel vapor passage 7 on the fuel tank T side opens inside the activated carbon 11, and the fuel vapor passage 8 on the engine E side is an upper filter. 9 is open to the upper space, and the lower space of the lower filter 10 communicates with the atmosphere through the atmosphere opening 12. In the fuel vapor passage 7 between the fuel tank T and the canister C, a two-way valve 13 which is a combination of two check valves is installed.

When the temperature of the fuel tank T rises and the internal fuel evaporates while the engine E is stopped, the fuel vapor flows through the two-way valve 13 into the canister C, where the activated carbon 11 It is prevented that it is adsorbed by and is leaked to the outside. At the same time, the internal pressure of the fuel tank T is released to the outside from the atmosphere opening 12 of the canister C, and the internal pressure of the fuel tank T is prevented from rising. Further, when the temperature of the fuel tank T is lowered, the outside air is introduced into the fuel tank T through the route opposite to the above-mentioned route, and the negative pressure is prevented from being generated inside the fuel tank T. Further, since negative pressure is generated in the intake pipe 5 during operation of the engine E, the atmosphere introduced from the atmosphere opening port 12 of the canister C is sucked through the vaporized fuel passage 8, and at that time, the activated carbon of the canister C is sucked. The evaporated fuel adsorbed by 11 is purged and supplied to the intake pipe 5.

[0005]

[Problems to be solved by the device]

 By the way, the conventional canister C is arranged in the engine room in order to connect to the intake pipe 5 of the engine E, which causes a problem that the narrow engine room is further narrowed. Therefore, it is conceivable to mount the canister C near the fuel tank T arranged in the rear part of the vehicle body. However, in this case, the capacity of the fuel tank T is significantly reduced in order to secure the installation space for the canister C. The problem occurs.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to minimize the decrease in the capacity of the fuel tank by arranging the fuel tank and the canister close to each other and rationally laying them out.

[0007]

[Means for Solving the Problems]

 To achieve the above object, the present invention provides a canister arranging structure in a fuel tank in which a canister for adsorbing evaporated fuel is arranged in the vicinity of the fuel tank. The first feature is that the canister is formed and the canister is fitted in the recess.

In addition to the above-mentioned first characteristic, the present invention has a second characteristic that a canister is interposed between a heat shield plate that shields heat of an exhaust system of an engine and a fuel tank.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention, FIG. 1 is an overall side view of an automobile, FIG. 2 is a plan view of a fuel tank, and FIG. 3 is a three-direction arrow view of FIG. FIG. 4 is a view in the direction of arrow 4 in FIG.

As shown in FIG. 1, the fuel tank T is mounted at a position corresponding to the lower portion of the rear seat of the automobile V. The exhaust pipe 13 extending from the engine E mounted on the front of the vehicle extends to the rear of the vehicle along the floor, bends to the right of the vehicle before the fuel tank T, passes through the right side of the fuel tank T, and reaches the rear end of the vehicle. Reach On the upper surfaces of the catalytic converter 14 for purifying exhaust gas and the muffler 15 provided in the exhaust pipe 13, heat shield plates 16 and 17 are provided to prevent their heat from being transferred to a passenger compartment or a trunk. Further, the exhaust pipe 13 near the fuel tank T is provided with a heat shield plate 18 for preventing heat transfer to the fuel tank T.

As shown in FIGS. 2 to 4, the fuel tank T is formed in a rectangular shape in plan view by vertically joining the upper member 19 and the lower member 20, and extends from the upper member 19 to the left side surface of the vehicle body. A fuel supply pipe 22 whose upper end is closed by a cap 21 is provided. A recess 23 extending in the vehicle front-rear direction is formed on the right side surface of the lower member 20, and a canister C is fitted and held in the recess 23. The right side surface of the canister C is provided with joints 24 and 25 to which the vaporized fuel passages 7 and 8 are connected and an atmosphere opening port 12.

The right side surface and the lower surface of the canister C are arranged so as to be substantially flush with the outer surface of the lower member 20 of the fuel tank T, so that the canister C projects from the fuel tank T to the outside. However, it is integrated with the fuel tank T so as to form a part of the fuel tank T. As a result, the capacity of the existing fuel tank T can be reduced by a necessary minimum amount corresponding to the volume of the canister C, and the canister C can be mounted without causing a dead space.

The exhaust pipe 13 extends in the front-rear direction of the vehicle body on the right side surface of the fuel tank T in which the canister C is mounted. The exhaust pipe 13 has a heat shield plate that blocks heat transfer to the fuel tank T. 18 is provided. Since the canister C is interposed between the heat shield plate 18 and the fuel tank T, heat transfer to the fuel tank T is blocked by the canister C in addition to the heat shield plate 18, and the temperature rise of the fuel tank T is prevented. It can be blocked more effectively.

FIGS. 5 to 7 show a second embodiment of the present invention, in which the canister C of this embodiment is formed to be narrower than the canister C of the first embodiment. As a result, the recess 23 of the lower member 20 of the fuel tank T is open to the front surface in addition to the right side surface and the lower surface, and the front end surface is visible to the canister C from the front surface side.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the present invention described in the scope of claims for utility model registration. It is possible to make design changes.

For example, although the recess 23 is formed in the lower member 20 of the fuel tank T in the embodiment, the recess 23 can be formed in the upper member 19 or the upper member 19 and the lower member 20.

[0018]

[Effect of the device]

 As described above, according to the first feature of the present invention, since the recessed portion that substantially corresponds to the outer shape of the canister is formed in the fuel tank and the canister is fitted in and attached to the recessed portion, no dead space is generated. The canister can be rationally laid out only by reducing the capacity of the fuel tank to the minimum required. Moreover, since the outer shape of the fuel tank including the canister does not change from the conventional one, it can be implemented at low cost without major modification to the vehicle body.

Further, according to the second feature of the present invention, the canister is interposed between the heat shield plate for shutting off heat of the exhaust system of the engine and the fuel tank. Therefore, in addition to the heat shield plate, the canister is used. Also, heat transfer to the fuel tank can be prevented, and the temperature rise of the fuel tank can be prevented more effectively.

[Brief description of drawings]

[Figure 1] Overall side view of a car

FIG. 2 is a plan view of a fuel tank according to a first embodiment of the present invention.

3 is a three-direction arrow view of FIG.

FIG. 4 is a four-direction arrow view of FIG.

FIG. 5 is a plan view of a fuel tank according to a second embodiment of the present invention.

6 is a view in the direction of arrow 6 in FIG.

FIG. 7 is a view from the direction of arrow 7 in FIG.

FIG. 8 is a diagram showing a conventional fuel supply system.

[Explanation of symbols]

 18 ... Heat shield 23 ... Recess C ... Canister T ... Fuel tank

Claims (2)

[Scope of utility model registration request] 1. A canister arranging structure in a fuel tank in which a canister (C) for adsorbing evaporated fuel is arranged in the vicinity of the fuel tank (T), wherein the canister (C) has an outer shape and The recess (23) is formed so as to substantially match with the recess (23).
A canister arrangement structure in a fuel tank, characterized in that the canister (C) is fitted to the. 2. The canister (C) is interposed between the heat shield plate (18) for shutting off heat of the exhaust system of the engine (E) and the fuel tank (T). Canister Arrangement Structure for Fuel Tanks.