JP2001180309A - Atmosphere opening structure for canister, and hose arrangement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an atmosphere opening structure for a canister that can prevent, an intrusion of water and mud into a canister and improve the performance of the canister. SOLUTION: For a vehicle equipped with a drain hose 8 at a fuel filler part 2 for refueling work and a canister 6 for adsorbing fuel vapor in a fuel tank, the atmosphere opening structure for a canister uses the drain hose 8 also as an atmosphere opening of a hose 7 connected to the canister 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air opening structure of a canister connected to a fuel tank of an automobile and a method of laying a hose, and more particularly, to preventing water and mud from entering a canister. The present invention relates to a structure of an atmosphere opening of a canister and a hose routing method capable of suppressing the pressure and improving the performance of the canister.

[0002]

2. Description of the Related Art Heretofore, a canister has a vent opening which is routed to an appropriate position in a vehicle body (for example, in a side frame) with a kind of maze structure in order to prevent water, mud and dust from entering the canister. Was provided. However,
A structure that is released to the bottom of the vehicle body, such as a vehicle body side frame, has a problem that the effect of the canister cannot be sufficiently enhanced. In order to solve such a situation, for example, a structure in which a canister opening is provided in a fuel saucer at a position higher than a side frame as described in Japanese Utility Model Laid-Open No. 2-68216 has been proposed.

[0003]

However, when a canister opening is formed in a fuel saucer, a drain hose as described in Japanese Utility Model Publication No. 58-45139 is disposed in the conventional fuel saucer. Therefore, when fuel overflowing from the drainage hose at the time of refueling is discharged out of the vehicle, a part of the overflowed fuel may vaporize and enter the vehicle interior to generate gasoline odor.
In addition, when the configuration disclosed in Japanese Utility Model Application Laid-Open No. 2-68216 is employed, it is necessary to separately arrange an opening from the canister and a hose for draining water in the fuel saucer in the fuel saucer, respectively. There is also the problem of complexity.

Accordingly, the present invention provides an air opening structure of a canister and a hose, in which an air opening of a hose from a canister is connected to a water drain hose arranged in a fuel saucer, and the water drain hose also serves as an air opening circuit of the canister. It is an object of the present invention to provide a routing method of the present invention and solve the above problems.

[0005]

According to the present invention, there is provided a vehicle having a fuel drainer hose for supplying fuel and a canister for adsorbing vaporized fuel in a fuel tank. An air opening structure of the canister, wherein the extraction hose is also used as an air opening of a hose connected to the canister, wherein the hose of the canister is once drawn upward and then drawn downward. The canister has an air opening structure in which an end of the downwardly routed hose is connected to the drain hose, and the drain hose and the air opening of the hose of the canister are provided. Is connected using a three-way pipe, and the communication position of the three-way pipe is arranged at a position lower than the uppermost position of the hose of the canister. An air opening structure of the canister, characterized in that the bristles are applied to the inside of the water drain hose on the fuel saucer side of the communication position between the water drain hose and the canister. In a vehicle having a fuel drainer hose for supplying fuel and a canister for adsorbing vaporized fuel in a fuel tank, the drain hose communicates with an air opening of the hose of the canister. The hose of the canister, wherein the hose of the canister is once routed upward, then routed downward, and an end of the hose routed downward is connected to the drain hose. It is a routing method.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the structure of the atmospheric opening of the canister according to the first embodiment, and FIG. 2 is a detailed view of a drain hose.

In FIG. 1, reference numeral 1 denotes a vehicle body, and a fuel saucer 2 is formed on a side surface of the vehicle body 1. A fuel tank 3 is arranged at the bottom of the vehicle body 1, and a filler pipe 5 connected to a fuel supply port 4 arranged inside the fuel saucer 2 is connected to the fuel tank 3. Filler pipe 5
A well-known canister 6 is arranged at a lower portion of the canister, and a hose 7 is connected to the canister. A solenoid valve 11 and a filter 12 are arranged on the hose 7, and after the hose 7 is once lifted up to near the fuel saucer 2 in order to further improve the backflow and purification performance, that is, to increase the head difference, The opening 7a of the hose 7 is bent downward from the highest part of the hose and is arranged downward.

On the other hand, a water draining hose 8 facing downwardly of the vehicle body 1 is disposed in the fuel saucer 2, and the water draining hose 8 and the hose 7 from the canister 6 are connected to a three-way pipe 9. The liquid from both hoses 7 and 8 is discharged outside the vehicle via three-way pipe 9. The three-way tube 9 has a shape in which the lower end opening 10 is narrowed, and prevents dust and the like from entering the three-way tube through the opening 10. As shown in FIG. 2, the drain hose 8 has pores 13 formed in the side portion inside the fuel saucer 2 and has a flocked portion 8a formed therein. The water flows down along the inner wall surface of the hose 8.

In the air opening structure of the canister having the above configuration, the drain hose and the hose from the canister can be shared, which is more economical and more effective than the conventional one. In addition, even if fuel overflows into the fuel saucer 2 due to a negative pressure generated in the canister 6 during traveling, the overflowed vaporized fuel is sucked by this negative pressure, so that the fuel odor enters the vehicle interior. Will not be done.

In the embodiment described above, the drainage hose is not limited to the planted one, and any hose having a function of surely allowing water to flow down along the inner peripheral wall surface may be employed. It is also possible to use non-flocked hoses in some cases. Furthermore, if the hose from the canister is bent at a position higher than the connection portion of the drainage hose to provide a head difference, various routings are possible. Moreover, the present invention may be embodied in various other ways without departing from its spirit and essential characteristics.

[0011]

As described above in detail, according to the present invention, since the structure is such that the path of the hose from the canister and the drainage hose can be shared, the structure can be simplified and the cost can be reduced. Since the hose from the canister is once drawn upward, the difference in head makes it difficult for the vaporized gas to leak. Negative pressure is generated in the canister during driving, so fuel overflowing during refueling and minute leaks from fillers are drawn into the fuel system side of the vehicle, reducing gasoline odor and preventing air pollution by fuel. be able to. And the like.

[Brief description of the drawings]

FIG. 1 is a structural diagram of an atmospheric opening of a canister according to an embodiment.

FIG. 2 is a structural view of a main part in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Fuel sosa 3 Fuel tank 4 Fuel supply port 5 Filler pipe 6 Canister 7 Hose 8 Drain hose 9 Three-way pipe 10 Three-way pipe lower end opening 11 Solenoid valve 12 Filter 13 Micropore

Claims (5)

[Claims] 1. A vehicle having a fuel drainer hose for supplying fuel and having a water drain hose and a canister for adsorbing vaporized fuel in a fuel tank, wherein the water drain hose is also used as an air opening of a hose connected to the canister. Atmospheric opening structure of the canister. 2. The hose of the canister is drawn up once and then drawn down, and an end of the hose drawn down is connected to the drain hose. The atmospheric opening structure of a canister according to claim 1, wherein: 3. The water drain hose and the air opening of the canister hose are connected by using a three-way pipe, and the communication position of the three-way pipe is lower than the uppermost position of the hose of the canister. The atmospheric opening structure of a canister according to claim 2, wherein the canister is arranged. 4. The method according to claim 1, wherein the water drainage hose is located on the fuel soser side of the drainage hose with respect to the communication position between the water drainage hose and the canister. Atmospheric opening structure of canister. 5. A vehicle having a fuel drainer hose for supplying fuel and having a canister for adsorbing vaporized fuel in a fuel tank, wherein the drain hose communicates with an atmospheric opening of the hose of the canister. The hose of the canister, wherein the hose of the canister is once routed upward, then routed downward, and an end of the hose routed downward is connected to the drain hose. Routing method.