JP2002332926A - Oil supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil supply system capable of simplifying layout and restricting a rise of manufacturing cost by unifying two lines to reduce the number of parts, and easily enabling additional supply of oil to be conducted. SOLUTION: In this oil supply system, a tank body 16a is connected through a vent line 6 to a canister 7, and a refuel control valve 18 provided in the middle of the vent line 6 is opened/closed by differential pressure between a first chamber 18b and a second chamber 18c parted by a diaphragm 18a provided in a case 18e. In the second chamber 18c, a unified line 19 is provided to be connected to a filler tube 2, and having an inlet opening part 20a at a prescribed height h2 in the tank body 16a to have a function as a signal line and a function as a recirculation line to reduce drawing of air from the outside of the tank body 16a during oil supply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refueling system used for a vehicle such as an automobile, and more particularly to an improvement for integrating a plurality of lines.

[0002]

2. Description of the Related Art Generally, for vehicles such as automobiles, a refueling system as shown in FIG. 3 is known.

In such a fuel tank, a filler tube 2 is provided to guide the fuel into a tank body 1a of a fuel tank 1 with a front end opening 2a facing a fuel supply port.

[0004] A filler cap 3 is provided at the distal end opening 2a of the filler tube 2 so as to open and close the distal end opening 2a.

A vent valve 4 is provided on the upper wall 1b of the tank body 1a. The vent valve 4 is connected to a canister 7 via an inflow tube 6 a of a vent line 6, a fuel control valve 5, and an outflow tube 6 b of the vent line 6.

The fuel control valve 5 is defined by a diaphragm 5a into a first chamber 5b and a second chamber 5c, and the second chamber 5c has an inflow tube 6a and an outflow tube 6b of a vent line 6. Is opened and the inflow side tube 6 is opened and closed by opening and closing the diaphragm 5a.
a and the outflow side tube 6b are configured to be communicated or blocked.

Further, an evaporative cut valve 8 is provided on the upper wall 1b of the tank body 1a. The evaporative cut valve 8 is connected to the canister 7 via an engine vacuum cut valve 9 and a fuel vapor line 10.

The fuel control valve 5 is connected to the vicinity of the tip 2 a of the filler tube 2 via a signal line 11.

Then, the upper wall portion 1b of the tank body 1a
The filler tube 2 and the vicinity thereof are connected via a recirculation line 12.

Next, the operation of the conventional oil supply system will be described.

In this conventional oil supply system, the pressure inside the filler tube 3 becomes the same as the pressure inside the tank body 1a when the filler cap 3a is closed during running.
Thereby, the first of the fuel control valve 5
Since the inside of the chamber 5b and the inside of the inflow tube 6a of the vent line 6 have the same pressure, the fuel control valve 5 maintains the closed state.

Also, the fuel control valve 5
At the time of closing, when the pressure in the tank body 1a rises and reaches a certain set value, the engine vacuum cut valve 9 opens and fuel vapor is discharged to the canister 7 through the fuel vapor line 10.

In the canister 7, after the fuel component is adsorbed, the purified gas is released to the atmosphere.

When refueling, the filler cap 3 of the filler tube 2 is removed and the tip 2a is removed.
The fuel supply nozzle is inserted from the opening of the fuel tank 1, and the fuel flows down from the filler tube 2 into the fuel tank 1.

The fuel partially becomes fuel vapor in the fuel tank 1 and is sent from the vent line 6 to the canister 7 through the fuel control valve 5.

That is, while the inside of the tank body 1a is higher than the atmospheric pressure due to the evaporating gas pressure and the inflow pressure of the fuel, the inside of the tank body 1a is connected to the tip 2a of the filler tube 2 which becomes negative pressure due to the entrainment of the atmosphere when the fuel flows in. The signal line 11 is connected to the first of the fuel control valve 5.
Since it is connected to the chamber 5b, the first chamber 5b of the fuel control valve 5 has a negative pressure during fuel inflow.

As a result, the diaphragm 5a is opened,
The fuel vapor is led to the canister 7 through the vent line 6, and after the fuel is adsorbed, the air is released to the atmosphere.

Since gas is released from the tank body 1a in this manner, fuel can be supplied smoothly.

The fuel vapor is supplied to the signal line 11
Is also circulated in the recirculation line 12.

The fuel level 13 in the fuel tank 1
a rises to reach the lower end 4a of the vent valve 4, the float in the vent valve 4 rises, closes the lower end of the inflow side tube 6a, and closes the vent valve 4.

As a result, the pressure in the fuel tank 1 rises, and the liquid level 13a of the fuel 13 rises
And the automatic stop mechanism provided in the refueling nozzle is operated to stop refueling.

Other fueling systems of this type include those described in US Pat. No. 4,714,172 and others. In order to reduce air entrapment from outside the tank body during refueling, a refueling system is disclosed. A refueling system for setting the circulatory line 12 is known.

[0023]

However, in such a conventional refueling system, the recirculation line 12, the vent valve 4 and the fuel control valve 5 are used from the upper wall 1b in the fuel tank 1. Since the two signal lines 11 are protruded and extended to the vicinity of the distal end opening 2a of the filler tube 2, there is a problem that the manufacturing cost is high and the degree of freedom in layout is low.

Also, after the liquid level 13a of the fuel 13 reaches the lower end 4a of the vent valve 4, the fuel is automatically stopped, and then the return pressure of the vent valve 4 (after the valve is closed, when the liquid level falls, the valve is reset again). There was also a problem that the pressure required for opening) increased.

To solve this problem, a configuration using a vent valve 4 having a two-stage float structure is also known.
Since the structure becomes complicated, there is a possibility that the cost may increase.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to reduce the number of parts by integrating two lines, thereby simplifying the layout and suppressing an increase in manufacturing cost. An object of the present invention is to provide a refueling system capable of easily performing additional refueling.

[0027]

In order to solve the above problems, according to the first aspect of the present invention, a fuel tank includes a tank body, and a filler tube connected to the tank body to supply fuel. The tank body is connected to a canister via a vent line, and a fuel control valve provided in the middle of the vent line is provided with a diaphragm provided in a case of the fuel control valve. The first defined
An oil supply system that is opened and closed by a differential pressure between the chamber and the second chamber, wherein the tank body is connected to the first chamber via an inlet tube of the vent line, and an outlet side of the vent line. A tube is connected to the canister, and the second chamber is connected to the filler tube, and has an inlet opening formed at a predetermined height in the tank body to function as a signal line. It features a refueling system that is provided with an integrated line that also serves as a recirculation line that reduces air entrainment from outside the tank body during refueling.

According to the first aspect of the present invention, at the time of refueling, the filler tube is opened to the atmospheric pressure, and when the fuel is poured into the filler tube, the filler tube enters the tank body. The fuel vapor generated by the fuel flowing down is circulated from the inlet opening through the integrated line into the filler tube.

For this reason, entrainment of air during refueling is prevented, and new generation of fuel vapor is suppressed.

When refueling progresses and the fuel level reaches the inlet opening of the integrated line, the liquid level rises in the integrated line. At this time, the pressure in the first chamber of the fuel control valve provided in the middle of the vent line is higher than the pressure in the second chamber, and the diaphragm is moved by the differential pressure. When released, the fuel vapor in the tank body is discharged toward the canister.

Further, as the refueling proceeds, the fuel vapor in the integrated line loses its escape, and the pressure difference between the pressure in the first chamber of the fuel control valve and the pressure in the second chamber disappears. The fuel control valve is closed, and the pressure in the tank body increases.

For this reason, the fuel level rises in the filler tube and an automatic stop is applied.

According to the second aspect of the present invention, a rollover valve is provided at a connection portion of the inflow tube of the vent line on the tank body side.
The refueling system described is characterized.

According to the second aspect of the present invention, the rollover valve provided at the connection portion of the inflow side tube of the vent line at the tank main body side is provided.
Liquid leakage during vehicle rollover is prevented.

Since it is not necessary to provide the inflow side tube of the vent line with a function of detecting the liquid level, the rollover valve having a simple structure can be used, and the increase in manufacturing cost can be suppressed.

According to the third aspect,
The second chamber of the fuel control valve is connected to a supercharging prevention tube provided with an inlet opening located below the inlet opening of the integrated line,
3. The orifice according to claim 1, wherein the integrated line is formed with an orifice that increases pressure in the tank body by generating a pressure loss and gradually removes air to enable additional refueling. 4. It features a refueling system.

According to the third aspect of the present invention, since the inlet opening of the supercharging prevention tube is located lower than the inlet opening of the integrated line, the fuel liquid level is reduced. When reaching the inlet opening of the supercharging prevention tube, the pressure in the tank body increases due to the pressure loss of the orifice provided in the integrated line, and the fuel level rises in the filler tube. , You can make auto stop.

When additional fuel is supplied at a low flow rate after the first automatic stop, the fuel vapor can flow through the integrated line from the inlet opening of the integrated line through the orifice in the direction of the filler tube to be refueled.

When the fuel level rises again in the tank main body due to the additional refueling and reaches the inlet opening of the integrated line, the fuel vapor cannot escape in the direction of the filler tube, and the pressure in the tank main body increases. Rises.

Therefore, the fuel level rises in the filler tube, an automatic stop is applied, and the refueling is completed.

Further, according to the fourth aspect, the second chamber is configured to be located lower than the first chamber. It features a refueling system.

According to the fourth aspect of the present invention, since the second chamber is located lower than the first chamber, the integrated chamber connected to the second chamber is provided. Even if fuel flows in from the line, no liquid pool is generated, and there is no danger of blocking the path of the integrated line with the liquid pool.

For this reason, the function as a circulation line and the function as a signal line can always be used as an integrated line.

[0044]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings. Parts that are the same or equivalent to those in the conventional example will be described with the same reference numerals.

FIG. 1 shows an oil supply system according to Embodiment 1 of the present invention. Parts that are the same or equivalent to those in the conventional example will be described with the same reference numerals.

First, the structure will be described. In the refueling system according to the first embodiment, a fuel tank 16 provided on the body of an automobile is used to supply fuel.
A filler tube 2 for guiding the fuel into 6 is provided.

A filler cap 3 is provided at the distal end opening 2a of the filler tube 2 so as to open and close the distal end opening 2a.

On the upper wall 16a of the fuel tank 16,
A rollover valve 17 is provided to guide the fuel vapor in the fuel tank 16 to the canister 7 through the vent line 6.

In the middle of the vent line 6, a fuel control valve 18 is provided.

This fuel control valve 18
Mainly includes a diaphragm 18a extending substantially horizontally in the case 18a, a first chamber 18b defined by the diaphragm 18a, and a second chamber 18c located below the first chamber 18b. It is configured to have.

The inflow tube 6a of the vent line 6 is connected to the first chamber 18b.

The connection portion 6d of the inflow tube 6a on the tank main body side is connected to the tank main body 16a via the rollover valve 17 located in the tank main body 16a.

The outlet opening 6c of the outlet tube 6b of the vent line 6 is in contact with the upper surface of the diaphragm 18a in the first chamber 18b.

The distal end opening 6c is opened and closed by movement of the diaphragm 18 in and out of the plane, and is closed when the pressure in the first chamber 18b is equal to the pressure in the second chamber 18c. Further, when the pressure in the first chamber 18b becomes larger than the pressure in the second chamber 18c, the diaphragm 18a is opened apart from the upper surface side, and the fuel vapor in the tank body 16a is released. It is configured to discharge in the direction of the canister 7.

The second chamber 18c is provided with an integrated line 19 which has both a function as a signal line and a function as a recirculation line for reducing air entrainment from outside the tank body 16a during refueling. Have been.

The integrated line 19 is connected to the second chamber 18c.
The vertical tube 20 inserted into the tank main body 16a from the bottom portion 18d of the base tube and the branching point 20b of the vertical tube 20 at a predetermined height position h1 in the tank main body 16a are led out in a substantially horizontal direction to form the filler tube 2 And a horizontal tube 21 connected to the vicinity of the distal end opening 2a.

The lower end of the vertical tube 20 of the integrated line is configured to communicate with the inside of the tank body 16a through an inlet opening 20a provided at a predetermined height h2 in the tank body 16a. I have.

Next, the operation of the first embodiment will be described.

In the first embodiment, at the time of refueling, the filler cap 3 provided at the distal end opening 2a of the filler tube 2 is removed, and the inside of the filler tube 2 is opened to the atmospheric pressure. Then, a fueling nozzle (not shown) is inserted, and fuel is poured.

The fuel vapor generated by the fuel that has flowed into the tank body 16a flows from the inlet opening 20a of the integrated line 19 to the vertical tube 20 of the integrated line 19.
Is circulated through the filler tube 2 via a part of the horizontal tube 21.

For this reason, the entrainment of air during refueling is prevented, and new generation of fuel vapor is suppressed.

When refueling proceeds and the fuel level 13 a reaches the inlet opening 20 a of the integrated line 19, the fuel level 13 a rises up a part of the vertical tube 20 of the integrated line 19.

At this time, the first chamber 1 of the fuel control valve 18 provided in the middle of the vent line 6
The pressure in the second chamber 18c is higher than the pressure in the second chamber 18c. When the diaphragm 6c moves by the differential pressure, the distal end opening 6c of the outflow side tube 6a provided inside the fuel control valve 16 is closed. The fuel vapor in the tank body 16a is released from the diaphragm 6c and is discharged toward the canister 7 through the outflow tube 6a.

Further, as the refueling proceeds, the liquid level 16a in the integrated line 19 becomes as shown at f1 in FIG.
0b, the fuel vapor loses its escape space, the pressure difference between the pressure in the first chamber 18b of the fuel control valve 18 and the pressure in the second chamber disappears, and the fuel control valve is moved by the diaphragm 6c. The front end opening 6c of the tank 18 is closed, and the pressure in the tank body 16a increases.

For this reason, the fuel level 13a rises in the filler tube 2 and the auto-stop mechanism of the refueling nozzle functions to perform an automatic stop.

A rollover valve 17 is provided at the connection portion 6d of the inflow side tube 6a of the vent line 6 on the tank main body side to prevent liquid leakage at the time of vehicle rollover.

The inflow side tube 6d of the vent line 6
Need not have a function to detect the liquid level,
The rollover valve 17 having a simple structure can be used, and an increase in manufacturing cost can be suppressed.

Further, in the fuel control valve 18 of the first embodiment, the second chamber 18c is
Even if fuel flows in from the integrated line 19 connected to the second chamber 18c, no liquid pool will be generated because the liquid is stored below the chamber 18b. There is no danger of blocking the path of the line 19 with the liquid pool.

For this reason, this integrated line 19 is always
It can be used while exhibiting a function as a circulation line and a function as a signal line.

[0070]

Embodiment 2 FIG. 2 shows an oil supply system according to Embodiment 2 of the present invention. The first embodiment
The same or equivalent parts will be described with the same reference numerals.

In the refueling system according to the second embodiment, in addition to the configuration of the first embodiment, a second chamber 118 located below the fuel control valve 118 is further provided.
The super-lubrication prevention tube 22 is connected to the bottom surface portion 118d of c.

The supercharging preventing tube 22 is inserted into the tank body 16a from the upper wall 16b and has a height lower than the branch point 20b and the inlet opening 20a of the vertical tube 20 of the integrated line. An entrance opening 22a is provided at a position h3.

The vertical tube 2 of the integrated line 19
0, above the inlet opening 20a, and
Below the height position h1 where the horizontal tube 21 is connected, a pressure loss is generated to increase the pressure in the tank body 16a, and the air is gradually vented, thereby enabling additional lubrication. An orifice 23 is formed.

Next, the operation of the second embodiment will be described.

In the second embodiment, when a fuel supply nozzle (not shown) is inserted into the filler tube 2 and the fuel is poured, the fuel vapor generated by the fuel flowing down into the tank body 16a is removed by the fuel vapor. The horizontal tube 21 is entered from the inlet opening 20a of the integrated line 19 through a part of the vertical tube 20 of the integrated line 19, and also enters the second chamber 118c from the inlet opening 22a. , And enters the horizontal tube 21 and is circulated in the filler tube 2.

Therefore, entrainment of air during refueling is prevented, and new generation of fuel vapor is suppressed.

As the refueling proceeds, the fuel level 13a becomes higher than the height h3.
And an inlet opening 22 of the tube 22 for preventing supercharging.
a, the fuel level 13a starts rising inside the supercharging prevention tube 22, and the fuel vapor in the tank body 16a passes through the vertical tube 20 in which the orifice 23 is formed. The horizontal tube 21
From the filler tube 2.

At this time, since the inlet opening 22a of the supercharging prevention tube 22 is located lower than the inlet opening 20a of the integrated line 19, the fuel liquid level 13a
Reaches the inlet opening 22a of the supercharging prevention tube 22, the orifice 2
Due to the pressure loss of 3, the pressure in the tank body 16a rises, and the fuel level 13a rises in the filler tube 2, so that the automatic stop can be performed.

When additional fuel is supplied at a low flow rate after the first automatic stop, the fuel vapor flows in through the inlet opening 20a of the integrated line 19, and passes through the orifice 23 in the integrated line 19 in the direction of the filler tube 2. Refueling is possible.

When the fuel level 13a rises again in the tank body 16a due to the additional refueling and reaches the inlet opening 20a of the integrated line 19, the fuel vapor cannot escape in the direction of the filler tube 2; Tank body 1
The pressure in 6a rises.

For this reason, the fuel level 13a rises in the filler tube 2 and is automatically stopped.
Refueling ends.

[Brief description of the drawings]

FIG. 1 shows a refueling system according to a first embodiment of the present invention,
FIG. 2 is a schematic diagram illustrating the entire configuration.

FIG. 2 is a schematic diagram illustrating an oil supply system according to a second embodiment and illustrating an entire configuration.

FIG. 3 is a schematic diagram showing a conventional example of a refueling system and showing an overall configuration.

[Explanation of symbols]

6 Vent line 6a Inflow side tube 6b Outflow side tube 6d Tank main body side connection part 7 Canister 16 Fuel tank 16a Tank main body 18, 118 Fuel control valve 18a, 118a Diaphragm 18b, 118b First chamber 18c, 118c Second chamber 18d, 118d Bottom part 18e, 118e Case 19 Integrated line 20 Vertical tube 20a Inlet opening 20b Junction point 21 Horizontal tube 22 Tube for preventing supercharging 22a Inlet opening 23 Orifice

Claims (4)

[Claims] 1. A fuel tank having a tank body and a filler tube connected to the tank body for supplying fuel, wherein the tank body is connected to a canister via a vent line, and A fuel supply system in which a fuel control valve provided in the middle of the vent line is opened and closed by a differential pressure between a first chamber and a second chamber defined by a diaphragm provided in a case of the fuel control valve. The first chamber is connected to the tank body via an inlet tube of the vent line, and an outlet tube of the vent line is connected to the canister,
The second chamber is connected to the filler tube and has an inlet opening formed at a predetermined height in the tank body to function as a signal line and to supply air from outside the tank body during refueling. A refueling system, wherein an integrated line is provided which also serves as a recirculation line for reducing entrainment. 2. The refueling system according to claim 1, wherein a rollover valve is provided at a connection portion of the inflow side tube of the vent line on the tank body side. 3. A supercharging prevention tube provided with an inlet opening located below the inlet opening of the integrated line is connected to the second chamber of the fuel control valve, and is connected to the integrated line. 3. An orifice for increasing pressure in a tank body by generating a pressure loss and gradually bleeding air to form an orifice capable of additional oil supply. Refueling system. 4. The apparatus according to claim 1, wherein the second chamber is located below the first chamber.
The refueling system according to any one of claims 1 to 3.