JP2001080372A - Fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fuel staying in a lower curved portion of a breather pipe of a fuel tank from hindering refueling by a refueling gun. SOLUTION: A breather pipe 13 of a fuel tank T is
Lower curved portion 13 ₂ is formed in the middle in order to avoid interference with the body frame 16, the float valve 21 is provided at one end of the breather pipe 13. Residence and a lower curved portion 13 ₂ of the jet pump 19 and the breather pipe 13 to operate the return fuel from the engine fuel suction pipe 2
Connected by 0, sucking and discharging the fuel staying in the downward curved portion 13 ₂ by the operation of the jet pump 19. The fuel injection holes 19 ₂ of the height of the jet pump 19, the float valve 21 is substantially equal to the height of the full liquid level F of closing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank used for an automobile or the like, and more particularly to a fuel tank having a breather pipe having one end communicating with an upper space of a tank body and the other end communicating with a filler port of a filler pipe. About.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional fuel tank T for an automobile.
It shows. The fuel tank T has a tank body 11 mounted on the lower surface of the rear part of the vehicle body, and a filler pipe 12 having one end connected to a lower space thereof rises obliquely upward toward the vehicle body side and has a fuel supply formed at the other end. Mouth 12 ₁
Opens on the side of the vehicle body. The upper space of the tank body 11 and the filler port 12 ₁ of the filler pipe 12 are connected by a breather pipe 13, and the end of the breather pipe 13 extending to the upper space of the tank body 11 has a fuel level that is equal to the full liquid level. A float valve 21 is provided to close the breather pipe 13 when it rises to F.

[0003] Thus, when fuel is supplied from the oil supply port 12 ₁ of the filler pipe 12 using an oil supply gun G, with the fuel level in the tank main body 11 rises, tank body 11
The air in the headspace of the float valve 21 in the valve opening state, is discharged to the outside through the breather pipe 13 and the fuel supply port 12 _1. When the fuel level of the tank body 11 reaches the full liquid level F and the float valve 21 is closed, the breather pipe 1
3 is closed, the air in the upper space of the tank body 11 is sealed, and the rise of the fuel level is regulated, so that the fuel supplied from the refueling gun G raises the fuel level in the filler pipe 12. Then, when the fuel level in the filler pipe 12 reaches the height of the nozzle N of the refueling gun G, the auto-stop device of the refueling gun G operates to stop the supply of fuel. During operation of the engine, fuel in the tank body 11 is supplied to the feed pipe 15 by an in-tank type fuel pump 14.
Through the engine.

[0004] By the way, as shown in FIG.
When an obstacle such as a vehicle body frame 16 between the 1 and the fuel supply port 12 ₁ is present, it may be curved intermediate breather pipe 13 to avoid interference with the obstacle facing downward. With such downward curved portion 13 ₂ which is curved downward in the middle of the breather pipe 13 are formed, the fuel fuel vapor is liquefied or accumulated in the lower curved portion 13 _2, or in shaking caused by the traveling of the automobile The fuel in the tank body 11 flows into the breather pipe 13 and the lower curved portion 1
3 ₂ which may or staying in.

[0005] breather pipe 13 in the fuel staying in the downward curved portion 13 ₂ is closed, the upper space of the air breather pipe 13 of the tank body 11 during refueling by the fueling gun G
, The fuel level in the filler pipe 12 rises with the fuel that cannot flow into the tank body 11, and the auto-stop of the refueling gun G operates before the tank body 11 is filled with the fuel. Problem occurs. Further, when the pressure in the upper space of the tank body 11 rises sharply due to the pressure of the fuel supplied from the refueling gun G, the lower curved portion 13 ₂ of the breather pipe 13 is generated by the pressure.
There are cases where the fuel staying in the jetted into the fuel supply port 12 ₁ of the filler pipe 12. Also in this case, there is a problem that the automatic stop of the refueling gun G is activated by the ejected fuel before the tank body 11 is filled with the fuel.

Therefore, as shown in FIG. 8, a jet pump 19 is provided at a downstream end of a return pipe 18 for returning surplus fuel from the fuel injection device of the engine into the tank body 11, and the jet pump 19 and the lower curved portion 13 are provided. and ₂ connected in residence fuel suction pipe 20, by sucking the tank body 11 of the fuel staying in the downward curved portion 13 ₂ via the residence fuel suction pipe 20 at a negative pressure of the jet pump 19 occurs, the problem It is possible to solve.

[0007]

However, as shown in FIG. 8, a breather pipe 1 extending to a tank body 11 is provided.
The fuel injection port 19 of the jet pump 19 corresponds to the full tank level F at which the float valve 21 provided at the end of the fuel pump 3 is closed.
₂ is located at a lower position, the jet pump 19 is also stopped during refueling with the engine stopped, so that the retained fuel is sucked from the fuel injection port 19 ₂ of the jet pump 19 as the fuel level rises. pipe 20 through will flow back the fuel downwardly curved portion 13 ₂ of the breather pipe 13, as a result auto-stop device for the fuel level in the filler pipe 12 rises fueling gun G is thus activated early problems There is.

[0008] Conversely, when the fuel injection holes 19 ₂ of the jet pump 19 is disposed at a higher position relative to the full fluid level F, the float valve 21 fuel tank T becomes a full
Is closed, the upper space of the tank body 11 and the filler pipe 12 are kept in communication with each other via the accumulated fuel suction pipe 20 and the breather pipe 13, so that the fuel level in the filler pipe 12 can rise. Refueling Gun G
There is a problem that the automatic stop device does not work.

Further, as shown in FIG. 8, when the jet pump 19 operates with the float valve 21 closed, the fuel in the tank body 11 passes through the filler pipe 12, the breather pipe 13 and the accumulated fuel suction pipe 20. to be sucked into the jet pump 19, the fuel level in the filler pipe 12 rises to the oil supply port 12 _1. Therefore, if the fuel cap is accidentally opened in this state, the fuel filler 1
2 ₁ fuel is likely to be ejected. If the fuel cap is not completely closed,
Although the fuel level in the fuel tank 2 does not rise, the air is supplied by the jet pump 19 to the refueling port 12 ₁ and the breather pipe 1.
3 and the tank body 11 through the retained fuel suction pipe 20
Therefore, there is a problem that the internal pressure of the tank body 11 increases and the amount of generated fuel vapor increases, so that the canister is deteriorated early.

The present invention has been made in view of the above circumstances, and has as its object to provide a fuel tank that can solve the above-mentioned problems.

[0011]

According to the first aspect of the present invention, there is provided a tank body for storing fuel, and one end communicates with a lower space of the tank body. A filler pipe formed with a filler port into which a filler gun is inserted, and a breather having one end communicating with the upper space of the tank body and the other end communicating with the filler port of the filler pipe, and a lower curved portion formed in the middle. A pipe, a float valve provided at one end of the breather pipe, and closed when the fuel level in the tank body reaches the full level, and a fuel retained in the lower curved portion of the breather pipe through the retained fuel suction pipe. And a jet pump for sucking and sucking the fuel.The fuel tank is characterized in that the height of the fuel jet port of the jet pump is made substantially equal to the height of the full liquid level. .

According to the above configuration, the height of the fuel injection port of the jet pump is substantially equal to the height of the full tank level.
Prevents fuel from flowing back from the fuel injection port through the stagnant fuel suction pipe to the lower curved portion of the breather pipe during refueling when the jet pump is stopped, and prevents the automatic operation of the automatic stop device of the refueling gun due to blockage of the breather pipe can do. Also, when the float valve is closed, the upper space of the tank body and the filler pipe are prevented from communicating with each other via the fuel jet port of the jet pump, the retained fuel suction pipe and the breather pipe, and the fuel level in the filler pipe rises. As a result, the automatic stop device of the refueling gun can be reliably operated.

According to the second aspect of the present invention,
A tank body for storing the fuel, a filler pipe having one end communicating with the lower space of the tank body and the other end having an oil filler port into which a fuel gun is inserted, and one end communicating with the upper space of the tank body. The end communicates with the filler pipe filler port,
A breather pipe having a lower curved portion formed in the middle, a float valve provided at one end of the breather pipe and closing when the fuel level in the tank body reaches a full level, and a lower curved portion of the breather pipe. A jet pump that sucks the stagnated fuel through a stagnant fuel suction pipe, and opens the valve when the jet pump generates a predetermined suction force to release air in the upper space of the tank body. There is proposed a fuel tank characterized in that a check valve for enabling suction is provided in a staying fuel suction pipe.

According to the above configuration, the check valve that opens when the jet pump generates a predetermined suction force and allows the air in the upper space of the tank body to be suctioned is provided in the stagnant fuel suction pipe. When the jet pump is operated in a state where the liquid level reaches the full liquid level and the float valve is closed, it is possible to prevent the check valve from opening and generating an excessive negative pressure in the breather pipe. This not only prevents the fuel level in the filler pipe from being sucked up and prevents fuel from squirting from the filler port when the fuel cap is opened, but also when the fuel cap is not completely closed. Thus, a large amount of air is prevented from being sucked into the tank main body from the fuel supply port, and deterioration of the canister can be suppressed.

According to the third aspect of the present invention,
A tank body for storing the fuel, a filler pipe having one end communicating with the lower space of the tank body and the other end having an oil filler port into which a fuel gun is inserted, and one end communicating with the upper space of the tank body. The end communicates with the filler pipe filler port,
A breather pipe having a lower curved portion formed in the middle, a float valve provided at one end of the breather pipe and closing when the fuel level in the tank body reaches a full level, and a lower curved portion of the breather pipe. A jet pump that sucks the retained fuel through a retained fuel suction pipe, and when the jet pump operates while the float valve is closed, the air in the upper space of the tank body passes through the float valve. The fuel tank is characterized in that the fuel tank can be sucked into the breather pipe.

According to the above configuration, when the jet pump is operated while the float valve is closed, air in the upper space of the tank body is sucked into the breather pipe through the float valve, and an excessive negative pressure is generated in the breather pipe. Can be prevented. This not only prevents the fuel level in the filler pipe from being sucked up and prevents fuel from squirting from the filler port when the fuel cap is opened, but also when the fuel cap is not completely closed. Thus, a large amount of air is prevented from being sucked into the tank main body from the fuel supply port, and deterioration of the canister can be suppressed. According to the invention described in claim 4,
A tank body for storing the fuel, a filler pipe having one end communicating with the lower space of the tank body and the other end having an oil filler port into which a fuel gun is inserted, and one end communicating with the upper space of the tank body. The end communicates with the filler pipe filler port,
A breather pipe having a lower curved portion formed in the middle, a float valve provided at one end of the breather pipe and closing when the fuel level in the tank body reaches a full level, and a lower curved portion of the breather pipe. A jet pump that sucks the retained fuel through a retained fuel suction pipe; anda fuel tank provided with an intermediate portion of the retained fuel suction pipe connected to a float valve. There has been proposed a fuel tank characterized in that the closing of a float valve is regulated by an acting negative pressure.

According to the above construction, the intermediate portion of the accumulated fuel suction pipe is communicated with the float valve, and the closing of the float valve is regulated by the negative pressure acting on the accumulated fuel suction pipe by the operation of the jet pump. When the jet pump operates with the float level closed and the float valve closed, it is possible to forcibly open the float valve to prevent excessive negative pressure from being generated in the breather pipe. it can. This not only prevents the fuel level in the filler pipe from being sucked up and prevents fuel from squirting from the filler port when the fuel cap is opened, but also when the fuel cap is not completely closed. Thus, a large amount of air is prevented from being sucked into the tank main body from the fuel supply port, and deterioration of the canister can be suppressed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.
7 and 8 in the following first to fourth embodiments.
The same constituent elements as those of the conventional example shown in FIG.

FIG. 1 corresponds to the first aspect of the present invention.
FIG. 8 shows a first embodiment, which is compared with the conventional example shown in FIG.
As is apparent, the jet pump 19 of the first embodiment
Fuel outlet 19_TwoHeight is full of tank body 11
It is arranged so as to substantially coincide with the height of the liquid level F. Thus,
Lower curved portion 13 of breather pipe 13_TwoFuel stagnates
Even the surplus fuel returned from the engine is
19 Venturi nozzles 19₁Occurs when passing through
With the negative pressure, the lower curved portion 13 of the breather pipe 13 _TwoStay in
The fuel that has flowed through the accumulated fuel discharge pipe 20 into the tank body
11 can be sucked inside. This allows refueling
Sometimes the lower curved portion 13 of the breather pipe 13_TwoFuel stagnation
So that the fuel level in the filler pipe 12
Prevents early rise and fills tank body 11 with fuel
Automatic stop device of refueling gun G is activated before
Can be prevented.

The fuel jet port 19 of the jet pump 19
_{When 2} is located at a position lower than the full tank liquid level F,
At the time of refueling when the jet pump 19 is stopped, the fuel outlet 19 ₂ of the jet pump 19 is increased as the fuel level rises.
Through the accumulated fuel suction pipe 20 and the breather pipe 13
The cause and the fuel flows back downwardly curved portion 13 _2, the fuel level in the filler pipe 12 rises due to blockage of the breather pipe 13, there is a problem that the automatic stop device of the fueling gun G is thus activated early. Further, if the fuel injection holes 19 ₂ of the jet pump 19 is disposed at a position higher than the full liquid level F, even float valve 21 is closed fuel level reaches the full liquid level F , Jet pump 19
Since the upper space of the tank body 11 and the filler pipe 12 are kept in communication with each other via the fuel outlet 19 ₂ , the retained fuel suction pipe 20 and the breather pipe 13, the fuel level in the filler pipe 12 can rise. There is a problem that the automatic stop device of the refueling gun G does not operate due to disappearance.

[0021] However, since in this embodiment substantially to match the fuel injection holes 19 ₂ of the height of the jet pump 19 to the height of the full liquid level F of the tank main body 11, to solve both of the above two problems Becomes possible.

Next, a second embodiment corresponding to the invention described in claim 2 will be described with reference to FIG.

In the second embodiment, the check valve 2 is connected to the staying fuel suction pipe 20 exposed in the upper space of the tank body 11.
2 is provided. The check valve 22 is provided with a check ball 25 urged by a spring 24 so as to close a valve hole 23 communicating with the upper space of the tank body 11, and the negative pressure generated by the jet pump 19 reduces the accumulated fuel suction pipe 20. , The valve opening pressure p (negative pressure) is reduced by the lower curved portion 13 of the breather pipe 13.
The height of the venturi nozzle 19 ₁ of the jet pump 19 based on ₂ is defined as h, and the full liquid level F of the tank body 11 is defined as h.
When the height of the connecting portion between the filler pipe 12 and the breather pipe 13 is defined as H and the specific weight of the fuel is defined as γ, γh <p <γH is established.

Thus, the jet pump 19 operates to operate the jet.
Downward curved portion 13 of reed pipe 13 _TwoFuel that has accumulated in
At the time of suction, the valve opening pressure p of the check valve 22 is increased by γh.
The check valve 22
Are kept closed. Therefore, the jet pump 19
Downward curved portion 13_TwoThe fuel that has accumulated in the
Can be.

When the jet pump 19 is operated with the fuel level reaching the full tank level F and the float valve 21 closed, the negative pressure generated in the breather pipe 13 causes the fuel level in the filler pipe 12 to decrease. Although the level rises, the fuel level in the filler pipe 12 rises only to a position lower than the connection with the breather pipe 13 by setting the valve opening pressure p of the check valve 22 to be smaller than γH. Therefore, even open the fuel cap 26 by mistake from this state, the fuel from the fuel supply port 12 ₁ no possibility to be ejected.

When the fuel cap 26 is not completely closed, the air is sucked into the tank body 11 through the fuel supply port 12 ₁ , the breather pipe 13 and the retained fuel suction pipe 20 by the jet pump 19. Although the fuel level in the pipe 12 does not rise,
Increased or the internal pressure of the atmosphere is sucked tank body 11 from the fuel supply port 12 _1, and increases the generation amount of the fuel vapor has a problem that the canister or early deterioration. However,
In the present embodiment of the negative pressure increases when the check valve 22 is opened residence fuel suction pipe 20, the problem is resolved is sucked in the atmosphere is inhibited from the fuel supply port 12 _1.

Next, a third embodiment corresponding to the invention described in claim 3 will be described with reference to FIG.

The float valve 21 is connected to the tank body 11
The valve housing 31 is detachably supported on the upper wall.
The valve housing 31 has the tank body 11
Float room 31 facing the upper space₁And the float chamber 31₁
Valve seat 31 formed on the upper part of _TwoAnd the valve seat 31_TwoAbove
Joint 31 formed and connected to breather pipe 13_ThreeWhen
Is formed. Float room 31₁The top is closed inside
The bottomed cylindrical float 32 is housed in a vertically movable manner.
The valve seat 31 is provided at the upper end thereof._TwoValve seat that can be seated on
33 are provided. Supports part of the weight of the float 32
Float room 31₁Between the bottom wall and the float 32
A spring 34 is disposed. And the float chamber 31₁
Has a plurality of communication holes 31_Four… Is formed and
Small hole 32 in the upper wall of₁Is formed.

When the fuel level in the tank body 11 rises during refueling, the float 32 of the float valve 21
Rises inside the float chamber 31 ₁ , and when the fuel level reaches the full tank level F, the valve body 33 of the float 32
1 ₂ seated in closing the breather pipe 13, raising the fuel level in the filler pipe 12. At this time, through the small hole 32 ₁ formed in the upper wall of the float 32 is air in the float 32 flows into the breather pipe 13 side, because the flow rate is very small, the fuel liquid surface within the filler pipe 12 Is not inhibited.

When the jet pump 19 is operated with the float valve 21 closed, the pressure inside the accumulated fuel suction pipe 20 and the breather pipe 13 becomes negative, so that the upper wall of the float 32 of the float valve 21 in the closed state is closed. air trapped inside the float 32 is sucked into the interior of the breather pipe 13 through the small hole 32 _1.
Then, the fuel level inside the float 32 rises from L ₁ to L ₂ and the submerged volume of the float 32 decreases,
The valve body 33 the float 32 is subsidence away from the valve seat 31 ₂ due to a decrease in buoyancy, the float valve 21 is opened. As a result, the inside of the breather pipe 13 communicates with the upper space of the tank body 11 so that a negative pressure is not generated, the fuel level in the filler pipe 12 is prevented from rising, and the fuel cap 26 is completely removed. When it is not closed, a large amount of air is prevented from being sucked into the tank body 11, and the same operation and effect as in the second embodiment can be achieved.

Next, a modification of the third embodiment will be described with reference to FIG.

In this modification, a check valve 35 is provided on the upper wall of the float 32. The check valve 35 is formed by covering the upper surface of a small hole 32 ₁ ... Penetrating the upper wall of the float 32 with a valve element 36 made of an elastic body. When the jet pump 19 operates while the float valve 21 is closed, the check valve 35 Check valve 35 due to negative pressure generated in pipe 13
Opens. As a result, the float 32 in the air will be sucked in the fuel liquid surface inside rises from L ₁ to L _2, the float 32 the valve body 33 by subsidence by the decrease in buoyancy valve seat 3
1 ₂ away from the negative pressure inside communicates with the upper space of the tank main body 11 of the breather pipe 13 is not generated. Thus, according to this modified example, the same operation and effect as the embodiment of FIG. 3 can be obtained. In particular, after the float 32 rises during refueling and the float valve 21 closes, the small holes 32 ₁ ... Of the float 32 are closed by the valve element 36, so that air is prevented from entering the breather pipe 13. The fuel level in the filler pipe 12 can be quickly raised, and the automatic stop device of the refueling gun G can be reliably operated.

Next, another modification of the third embodiment will be described with reference to FIG.

In this modification, communication holes 32 ₂ , 32 ₂ are formed in the side wall of the float 32. By forming the communication holes 32 ₂ , 32 ₂ in the side wall of the float 32, when the jet pump 19 is operated while the float valve 21 is closed, the air in the upper space of the tank main body 11 is released from the float chamber 3.
1 ₁ of the communicating hole 31 _4, 31 _4, the communicating hole 32 of the side wall of the float 32 _2, 32 ₂ and the small hole 3 of the upper wall of the float 32
It is sucked through 2 ₁ ... into the breather pipe 13. Therefore, while the float 32 is held at the valve closing position, the generation of a negative pressure inside the breather pipe 13 is prevented, and FIG.
The same operation and effect as the third embodiment can be exerted.

Next, a fourth embodiment corresponding to the invention described in claim 4 will be described with reference to FIG.

[0036] The examples are made to communicate an intermediate portion of the residence fuel suction pipe 20 at the bottom of the float chamber 31 ₁ of the float valve 21. When the jet pump 19 operates while the float valve 21 is closed, the accumulated fuel suction pipe 2
Float chamber 3 of float valve 21 with negative pressure generated at zero
11 Because the fuel in ₁ is sucked out and the fuel level drops,
The float 32 falls and the float valve 21 opens. Thus, it is possible to prevent a negative pressure from being generated inside the breather pipe 13 and exhibit the same operation and effect as the third embodiment of FIG.

Although the embodiment of the present invention has been described above, various design changes can be made in the present invention without departing from the gist thereof.

For example, the present invention can be applied to a fuel tank for a use other than an automobile. Further, in the embodiment, the jet pump 19 is provided on the return pipe 18, but the same effect can be obtained by providing the jet pump 19 on the feed pipe 15.

[0039]

As described above, according to the first aspect of the present invention, the height of the fuel outlet of the jet pump is made substantially equal to the height of the full tank level, so that the jet pump is stopped. When fuel is supplied, the fuel is prevented from flowing back from the fuel injection port to the lower curved portion of the breather pipe via the retained fuel suction pipe, and the automatic operation of the automatic stop device of the refueling gun due to the blockage of the breather pipe can be prevented. Also, when the float valve is closed, the upper space of the tank body and the filler pipe are prevented from communicating with each other via the fuel jet port of the jet pump, the retained fuel suction pipe and the breather pipe, and the fuel level in the filler pipe rises. As a result, the automatic stop device of the refueling gun can be reliably operated.

According to the second aspect of the present invention,
A check valve that opens when the jet pump generates a predetermined suction force to allow air in the upper space of the tank body to be sucked is provided in the stagnant fuel suction pipe, so that the fuel level reaches the full tank level. When the jet pump is operated with the float valve closed, it is possible to prevent the check valve from opening and the occurrence of excessive negative pressure in the breather pipe. This not only prevents the fuel level in the filler pipe from being sucked up and prevents fuel from squirting from the filler port when the fuel cap is opened, but also when the fuel cap is not completely closed. Thus, a large amount of air is prevented from being sucked into the tank main body from the fuel supply port, and deterioration of the canister can be suppressed.

According to the third aspect of the present invention,
When the jet pump is operated while the float valve is closed, the air in the upper space of the tank body is sucked into the breather pipe through the float valve, thereby preventing an excessive negative pressure from being generated in the breather pipe. This not only prevents the fuel level in the filler pipe from being sucked up and prevents fuel from squirting from the filler port when the fuel cap is opened, but also when the fuel cap is not completely closed. Thus, a large amount of air is prevented from being sucked into the tank main body from the fuel supply port, and deterioration of the canister can be suppressed.

According to the fourth aspect of the present invention,
The middle part of the accumulated fuel suction pipe is connected to the float valve, and the closing of the float valve is regulated by the negative pressure acting on the accumulated fuel suction pipe by the operation of the jet pump.
When the jet pump is operated with the fuel level reaching the full tank level and the float valve closed, the float valve is forcibly opened to prevent excessive negative pressure from being generated in the breather pipe. be able to. This not only prevents the fuel level in the filler pipe from being sucked up and prevents fuel from squirting from the filler port when the fuel cap is opened, but also when the fuel cap is not completely closed. Thus, a large amount of air is prevented from being sucked into the tank main body from the fuel supply port, and deterioration of the canister can be suppressed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a fuel tank according to a first embodiment of the present invention.

FIG. 2 is a view showing a fuel tank according to a second embodiment of the present invention.

FIG. 3 is an enlarged view of a float valve according to a third embodiment of the present invention.

FIG. 4 is a view showing a first modification of the float valve of the third embodiment.

FIG. 5 is a view showing a second modification of the float valve according to the third embodiment;

FIG. 6 is an enlarged view of a float valve according to a fourth embodiment of the present invention.

FIG. 7 shows a conventional fuel tank.

FIG. 8 is a diagram showing an example in which a jet pump is provided in a conventional fuel tank.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Tank main body 12 Filler pipe 12 ₁ Filling port 13 Breather pipe 13 ₂ Downward curved part 19 Jet pump 19 ₂ Fuel ejection port 20 Retained fuel suction pipe 21 Float valve 22 Check valve F Full tank level G Refueling gun

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Sasaki 1-4-1, Chuo, Wako, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Ryuji Fujino 1-4-1, Chuo, Wako, Saitama F term in Honda R & D Co., Ltd. (reference) 3D038 CA22 CA38 CA39 CC03 CC06 CC13 CC14 CD14

Claims (4)

[Claims] 1. A tank body (11) for storing fuel, and a fuel supply port (12 ₁ ) having one end communicating with a lower space of the tank body (11) and a fuel gun (G) inserted into the other end. One end communicates with the upper space of the tank body (11) and the other end communicates with the filler port (12 ₁ ) of the filler pipe (12),
A lower curved part in the middle (13 ₂₎ breather pipe is formed (13), to be provided at one end tank body (11) the fuel level is full liquid level in the breather pipe (13) (F) a float valve which is closed (21) is reached, the lower curved portion of the breather pipe (13) and (13 ₂₎ jet pump for sucking through the stagnant fuel residence fuel suction pipe (20) to (19), the a fuel tank having a fuel tank, characterized in that is substantially equal to the height of the fuel injection holes (19 ₂₎ the height full liquid level of the jet pump (19) (F). 2. A tank body (11) for storing fuel, and a fuel supply port (12 ₁ ) at one end of which communicates with a lower space of the tank body (11) and at the other end of which a fuel gun (G) is inserted. One end communicates with the upper space of the tank body (11) and the other end communicates with the filler port (12 ₁ ) of the filler pipe (12),
A lower curved part in the middle (13 ₂₎ breather pipe is formed (13), to be provided at one end tank body (11) the fuel level is full liquid level in the breather pipe (13) (F) a float valve which is closed (21) is reached, the lower curved portion of the breather pipe (13) and (13 ₂₎ jet pump for sucking through the stagnant fuel residence fuel suction pipe (20) to (19), the A fuel tank provided with a check valve (22) that opens when the jet pump (19) generates a predetermined suction force and enables suction of air in an upper space of the tank body (11). A fuel tank provided on a suction pipe (20). 3. A tank body (11) for storing fuel, and a fuel supply port (12 ₁ ) having one end communicating with a lower space of the tank body (11) and having a fuel gun (G) inserted at the other end. One end communicates with the upper space of the tank body (11) and the other end communicates with the filler port (12 ₁ ) of the filler pipe (12),
A lower curved part in the middle (13 ₂₎ breather pipe is formed (13), to be provided at one end tank body (11) the fuel level is full liquid level in the breather pipe (13) (F) a float valve which is closed (21) is reached, the lower curved portion of the breather pipe (13) and (13 ₂₎ jet pump for sucking through the stagnant fuel residence fuel suction pipe (20) to (19), the A fuel tank provided with a jet pump (1) while the float valve (21) is closed.
9) A fuel tank characterized in that, when 9) is operated, air in the upper space of the tank body (11) can be sucked into the breather pipe (13) through the float valve (21). 4. A tank body (11) for storing fuel, and a fuel supply port (12 ₁ ) having one end communicating with a lower space of the tank body (11) and a fuel gun (G) inserted at the other end. One end communicates with the upper space of the tank body (11) and the other end communicates with the filler port (12 ₁ ) of the filler pipe (12),
A lower curved part in the middle (13 ₂₎ breather pipe is formed (13), to be provided at one end tank body (11) the fuel level is full liquid level in the breather pipe (13) (F) a float valve which is closed (21) is reached, the lower curved portion of the breather pipe (13) and (13 ₂₎ jet pump for sucking through the stagnant fuel residence fuel suction pipe (20) to (19), the A fuel tank provided with: a middle portion of a stagnant fuel suction pipe (20) communicating with a float valve (21); and a jet pump (19) that operates by a negative pressure acting on the stagnant fuel suction pipe (20). A fuel tank for regulating closing of a valve (21).