JPH02197420A - Fuel tank of vehicle - Google Patents

Abstract

PURPOSE:To easily and surely prevent liquid fuel from flowing out to the canister side by disposing a check valve in a filler pipe for injecting liquid fuel into a fuel tank and using the space above the check valve as a separator. CONSTITUTION:Usually evaporated fuel in a fuel tank 1 is introduced into a filler pipe 3 through the first evaporation pipe 11 and a return pipe 13. Simultaneously evaporated fuel is introduced into the canister side through the second evaporation pipe 12. The liquefied gasoline 2 is temporarily stored in the space 15 above a check valve 6, and then again returned to the interior of the fuel tank 1 through the return pipe 13. That is, the space 15 is used as a separator. On the other hand, when the rear of the fuel tank 1 is inclined downward, the gasoline 2 in the fuel tank 1 is prevented from flowing backward to the filler pipe 3 side by the check valve 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fuel tank for a vehicle, and particularly to a fuel tank for a vehicle that is provided with an evaporative pipe that guides evaporated fuel generated in the tank to a canister.

(Prior Art) In general, fuel tanks installed in automobiles have a system that adsorbs and collects evaporated fuel generated within the fuel tank at high temperatures to prevent the evaporated fuel from being released into the atmosphere. - A canister is connected to the canister which sucks the evaporated fuel that has been adsorbed and collected by suction negative pressure during engine operation and releases it to the engine side.

In this case, if the fuel tank and canister are simply connected by a connecting pipe, not only evaporated fuel but also liquid fuel will be introduced into the canister through the connecting pipe, and the function of the canister will be affected. There was a risk of a significant decrease. For this reason, the liquid fuel and the vapor component are separated in the middle of the connection pipe connecting the fuel tank and the canister, and while the liquid fuel is returned into the fuel tank, only the vapor component is guided to the canister side. A separator is provided to reliably prevent liquid fuel from flowing into the canister even if the fuel tank is tilted.

For example, according to Japanese Utility Model Publication No. 57-8493, a housing is mounted on one side of the fuel tank at a height higher than the fuel tank while being shifted to one side in the longitudinal direction of the vehicle body, and a plurality of gas-liquid separation tanks are installed inside the housing. By forming a separator (gas-liquid separator), the separator reliably prevents liquid fuel from flowing out to the canister side.

(Problems to be Solved by the Invention) By the way, when the separator is attached to the side of the fuel tank in a state protruding upward from the tank as described above, the separator and a support member for reliably supporting it are attached. As a result, the number of parts increases, leading to an increase in vehicle weight and cost.

In addition, as mentioned above, the separator is installed in a state that protrudes above the fuel tank.
The entire fuel tank including the separator is bulky, which significantly impairs layout efficiency when it is installed in a limited vehicle space without interfering with other installation members. Ta.

Therefore, the present invention adds a separator function to the filler pipe that injects liquid fuel into the fuel tank, thereby making it possible to reliably prevent liquid fuel from flowing out to the canister side without providing a dedicated separator. The task is to

(Means for Solving the Problems) In order to solve the above problems, the present invention is characterized by the following configuration.

That is, in a fuel tank of a vehicle equipped with an evaporative pipe that guides evaporated fuel generated in the fuel tank to a canister, a filler is connected to one side of the fuel tank in the longitudinal direction of the vehicle body and injects liquid fuel into the tank. A check valve is provided at the bottom of the pipe to allow the liquid fuel to pass only when the liquid fuel is injected, and one end is connected to one side of the upper surface of the fuel tank in the longitudinal direction of the vehicle body, and the other end is connected to the upper part of the filler pipe. a second evaporative pipe having one end connected to the canister and the other end connected above the connection position of the first evaporative pipe in the filler pipe; and a second evaporative pipe having one end connected to the upper surface of the fuel tank. The present invention is characterized in that a return pipe is provided, which is connected to the other side in the longitudinal direction of the vehicle body, and whose other end is not connected to a position directly above the check valve provided at the lower part of the filler pipe.

(Function) According to the above configuration, normally, the fuel is supplied into the fuel tank through the first evaporation pipe and the return pipe, each of which has one end connected to the upper surface of the fuel tank and the other end connected to the filler pipe. The generated evaporative fuel flows into the filler pipe, and at the same time, this evaporative fuel is introduced into the canister via a second evaporative pipe whose one end is connected to the upper part of the filler pipe.

Part of the liquid fuel or vaporized fuel that has flowed out from the fuel tank is liquefied again, and the separated liquid fuel is temporarily stored in the space above the check valve in the filler pipe. The liquid fuel is returned to the fuel tank via the return pipe. In other words, the space above the check valve in the filler pipe functions as a separator, thereby ensuring that the liquid fuel flows out to the canister without the need for a special separator. It can be prevented.

Furthermore, since a check valve is installed below the filler pipe, even if the fuel tank is tilted, for example, when the vehicle is climbed or parked on an incline, the inside of the tank can be prevented. Backflow of liquid fuel to the filler pipe side is reliably prevented, thereby always securing a space having a predetermined volume above the check valve in the filler pipe that functions as a separator. Can be done.

As described above, according to the present invention, there is no need for a dedicated separator, and the number of parts can be reduced accordingly.
In addition to reducing vehicle weight and cost, the entire fuel tank is simplified and can be conveniently installed within the limited vehicle body space without interfering with other installation components. This makes it possible to further improve the layout.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of the fuel tank of the vehicle according to the present embodiment, and shows the rear of the fuel tank 1 in the longitudinal direction of the vehicle body (in the figure, the front of the vehicle is indicated by arrow F, and the rear of the vehicle is indicated by arrow R). A lower end 3a of a filler pipe 3 for injecting gasoline 2 as liquid fuel into the fuel tank 1 is integrally connected to the side surface 1a located at . A breather pipe 4 whose both ends are connected to the center of the upper surface 1b of the fuel tank 1 and above the filler pipe 3 is disposed, and the gasoline 2 is injected into the fuel tank 1. In this case, the air inside the tank 1 is discharged to the outside.

A check valve 6 is installed in the lower part of the filler pipe 3 via a casing 5, and as shown enlarged in FIG.
A valve body 7 is fitted into the casing 5 and has an injection lower a for gasoline 2 supplied from the filler pipe 3, and a lower end of the filler pipe 3 is integrally attached to the lower end of the valve body 7. A spring receiver member 8 in which a discharge port 8a for discharging the gasoline 2 toward the portion 3a (see FIG. 1) is formed; a ball member 9 serving as a valve body for closing the injection lower a in the valve body 7; The flange portion 9a integrally formed on the ball member 9 and the spring receiver are interposed between the member 8 and the injection lower a.
The coil spring 10 biases the ball member 9 in the direction of closing the ball member 9. Therefore, only when the gasoline 2 is injected, the ball member 9 descends against the coil spring 10, thereby allowing the gasoline 2 to flow into the fuel tank 1.

In addition, a plurality of slits 7b...7b are formed on the circumferential surface of the valve body 7 at equal intervals in the circumferential direction, so that a wider passage area is ensured and the gasoline 2 is The fuel can be smoothly injected into the fuel tank 1.

In this embodiment, as shown in FIG. 1.2, one end 11a is connected to one side (rear side of the vehicle body) of the upper surface 1b of the fuel tank 1 in the longitudinal direction of the vehicle body,
A first evaporative pipe 11 is provided, the other end 11b of which is connected to the upper part of the filler pipe 3, one end 12a is connected to a canister (not shown), and the other end 12b is connected to the filler pipe 3. A second evaporative pipe 12 connected to the pipe 3 above the connection position of the first evaporative pipe 11 is disposed. Further, a check valve 6 has one end 13a connected to the other side of the upper surface 1b of the fuel tank 1 in the longitudinal direction of the vehicle body (front side of the vehicle body), and the other end 13b provided at the lower part of the filler pipe 3.
A return passageway 13 connected to a position directly above is provided.

A check valve 14 is interposed in the middle of the second evaporative pipe 12 to prevent backflow of the evaporated fuel introduced into the canister.

Next, the operation of this embodiment will be described. In normal times, as shown in FIG. 1, one end 11a, 13a is connected to the upper surface 1b of the fuel tank 1 on the rear side of the vehicle body and the side part on the front side of the vehicle body, respectively. The other ends 11b and 13b are connected to the upper part of the filler pipe 3 and directly above the check valve 6 in the filler pipe 3, respectively, through the first evaporation pipe 11 and the return pipe 13. The evaporated fuel flows into the filler pipe 3, and this evaporated fuel
The canister is connected to the canister via a second evaporative pipe 12 whose one end 12a is connected to a canister (not shown) and whose other end 12b is connected to the upper part of the filler pipe 3.
It will be introduced on the side.

Then, the gasoline 2 that has flowed out from the fuel tank 1 and a portion of the evaporated fuel are liquefied and separated again, and the gasoline 2 is separated from the check valve 6 in the filler pipe 3.
The gasoline 2 is temporarily stored in the space 15 above the fuel tank 1, and is returned to the fuel tank 1 via the return pipe 13. That is, the space 15 above the check valve 6 in the filler pipe 3 functions as a separator, thereby allowing the gasoline 2 to flow out to the canister side without the need for a special separator. can be reliably prevented.

Furthermore, as shown in FIG. 5, even if the rear part of the fuel tank 1 is tilted downward with respect to the horizontal plane At the bottom, check valve 6
By providing this, backflow of the gasoline 2 in the fuel tank 1 to the filler pipe 3 side is reliably prevented. A space 15 having a predetermined volume that functions as a separator can be secured.

In addition, as shown in Fig. 1.5, the filler pipe 3
The upper part of the check valve 6 and the return pipe 1
When gasoline 2 is newly supplied to the fuel tank 1, the gasoline 2 stored between the other end 13b of the fuel tank 1 and the lower connection position of the fuel tank 1 becomes unnecessary, together with the newly supplied gasoline 2. , the number of parts can be reduced by that amount, reducing the weight and cost of the vehicle.
The whole structure is simplified, and it becomes possible to arrange the structure well within the limited space of the vehicle body without interfering with other cast members, thereby further improving its layout properties.

(Effects of the Invention) As described above, according to the present invention, the space above the check valve in the filler pipe for injecting liquid fuel into the fuel tank functions as a separator. It is possible to reliably prevent the liquid fuel from flowing into the canister side without the need to prepare a special separator, and the above-mentioned check valve also prevents the above-mentioned liquid fuel from flowing out to the canister side, for example, when the vehicle is mounted or parked on an incline. Even if the fuel tank is tilted, the liquid fuel in the tank is reliably prevented from flowing back toward the filler pipe, and as a result, there is always a separator above the check valve in the filler pipe. It is possible to secure a space having a predetermined volume that functions.

As described above, according to the present invention, there is no need for a dedicated separator, and the number of parts can be reduced accordingly.
In addition to reducing vehicle weight and cost, the entire fuel tank is simplified and can be conveniently installed within the limited vehicle body space without interfering with other installation components. This makes it possible to further improve the layout.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of a fuel tank of a vehicle according to the embodiment, and FIG.
3 is an enlarged longitudinal sectional view of the check pulp, FIG. 4 is a sectional view taken along the IV-IV line in FIG. 3, and FIG. FIG. DESCRIPTION OF SYMBOLS 1... Fuel tank, 2... Liquid fuel (gasoline), 3... Filler pipe, 6... Check valve <check pulp>, 11... First evaporative vibrator, 12...
・Second evaporative pipe, 13...Return pipe.

Claims (1)

[Claims] (1) In a fuel tank of a vehicle equipped with an evaporative pipe that guides evaporated fuel generated in the fuel tank to a canister, a filler that is connected to one side of the fuel tank in the longitudinal direction of the vehicle body and injects liquid fuel into the tank. A check valve is provided at the bottom of the pipe to allow the liquid fuel to pass only when the liquid fuel is injected, and one end is connected to one side of the upper surface of the fuel tank in the longitudinal direction of the vehicle body, and the other end is connected to the upper part of the filler pipe. a first evaporative pipe connected to the canister; a second evaporative pipe whose one end is connected to the canister and whose other end is connected above the connection position of the first evaporative pipe in the filler pipe; A fuel tank for a vehicle, comprising: a return pipe connected to the other side of the filler pipe, and the other end of which is connected to a position directly above a check valve provided at a lower portion of the filler pipe.