JP2004036449A - Integrated valve for fuel tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an integrated valve that integrates a bent valve and a cut valve reasonably without impairing their functions, also having a check valve function. <P>SOLUTION: This integrated valve includes a float body 110 having an upper space 1 communicated to a ventilation passage, a lower chamber 2 placed within a fuel tank T, an intermediate chamber 3 placed between the space 1 and the chamber 2, a first communicating portion 4 for communicating the space 1 to the chamber 3, a second communicating portion 5 for communicating the chamber 3 and the chamber 2, a third communicating portion 6 for communicating the space 1 and the chamber 2 not via the chamber 3, and a cut valve for blocking the second communicating portion 5 from the chamber 2 side, raised when fuel flows in, a bloat body 100 having a bent valve for blocking the third communicating portion 6 from the chamber 2 side, raised when fuel flows in, and a check valve configuration body 111 placed in the chamber 3 for operating to open the valves when the inside of the fuel tank T is in a fixed high-pressure state or a fixed low-pressure state. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a valve used to connect a fuel tank and a ventilation path to a canister.
[0002]
[Prior art]
Conventionally, the fuel tank and the canister are connected by a plurality of ventilation paths.
[0003]
One of the ventilation paths is generally called a vent line, and connects the canister and the fuel tank via a vent valve.
[0004]
The vent valve secures the ventilation of the fuel tank to allow refueling of the fuel tank, and shuts off the ventilation to the vent line when the fuel level in the fuel tank reaches a certain level due to this refueling. Alternatively, increase the internal pressure of the fuel tank by decreasing it, thereby increasing the liquid level of the fuel in the filler tube (or filler neck), and let the sensor on the refueling nozzle detect the full tank to prevent over-fuelling. is there.
[0005]
The other one of the ventilation paths is generally called an evaporation line, and connects the canister and the fuel tank via a cut valve.
[0006]
A check valve is further arranged on the evaporation line outside the fuel tank, and the evaporation line is usually shut off at the place where the check valve is installed. This check valve opens when the internal pressure of the fuel tank rises above the predetermined pressure range or falls below the predetermined pressure range to bring the pressure inside the fuel tank within the predetermined pressure range. It is to restore.
[0007]
In addition, the cut valve shuts off the evaporation line when the liquid level of the fuel in the fuel tank is higher than the full tank level due to inclination of the vehicle or rollover of the vehicle at the time of an accident, This prevents fuel from flowing into the canister.
[0008]
[Problems to be solved by the invention]
For this reason, conventionally, when assembling the ventilation system of a fuel tank, a vent valve and a cut valve are separately provided in the fuel tank, and two ventilation paths of a vent line and an evaporation line are provided in the fuel tank and the canister. And a check valve was required.
[0009]
From the viewpoint of reducing the number of parts and simplifying the assembling process, it is desired to integrate these functions without impairing their functions.
[0010]
Also, in recent years, from the viewpoint of environmental protection and the like, there is a strong demand for reduction of the emission of hydrocarbons generated from fuel. It is about to be done.
[0011]
Therefore, the present invention has a vent valve and a cut valve used to connect the fuel tank and the air passage to the canister, which are reasonably integrated without impairing these functions, and also has a check valve function. Its main purpose is to provide an integrated valve.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, in the invention according to claim 1, the integrated valve for a fuel tank has the following configurations (1) to (10).
(1) an upper space communicating with an air passage to the canister;
(2) a lower chamber disposed in the fuel tank;
(3) an intermediate room provided between the upper space and the lower room;
(4) a first communication section for communicating the upper space with the intermediate chamber;
(5) a second communication section for communicating the intermediate chamber and the lower chamber;
(6) a third communication part for communicating the upper space and the lower chamber without interposing the intermediate chamber;
(7) a float body constituting a cut valve housed in the lower chamber so as to rise due to the inflow of fuel into the lower chamber and close the second communication portion from the lower chamber side;
(8) a float that constitutes a vent valve housed in the lower chamber so as to rise due to the inflow of fuel into the lower chamber and close the third communication section from the lower chamber side;
(9) A check valve structure for opening the valve and communicating the lower chamber and the upper space via the intermediate chamber when the fuel tank is housed in the intermediate chamber and the inside of the fuel tank becomes a constant high pressure state or a constant low pressure state. And has
(10) When the liquid level of the fuel in the fuel tank reaches a liquid level higher than or equal to the level at which the float in the fuel tank rises to a position where the third communication portion is closed. , So as to be raised to a position where the second communication portion is closed.
[0013]
According to this configuration, when the liquid level of the fuel in the fuel tank reaches a level that raises the float constituting the vent valve, the third communication portion is closed by the float. As a result, the internal pressure in the fuel tank is increased, the liquid level of the fuel in the filler tube is increased, and the sensor on the fueling nozzle side can detect that the fuel tank is full.
[0014]
When the inside of the fuel tank becomes a constant high pressure state or a constant low pressure state in a state where the third communication portion is closed by the float body constituting the vent valve in this manner, the check valve structure is opened. By operating the valve, the fuel tank communicates with the ventilation path to the canister, so that the pressure in the fuel tank does not become higher than a predetermined pressure range or lower than a predetermined pressure range. can do.
[0015]
If the level of fuel in the fuel tank reaches a level that raises the float that forms the cut valve due to the vehicle tilting or the vehicle rolling over in an accident, the float that forms the vent valve The body blocks the air passage to the canister, and the float that constitutes the cut valve separates the portion normally closed by the check valve structure. In such a case, fuel does not flow into the air passage side of the canister. You can do so.
[0016]
That is, such a valve is a single valve, but has a function as a vent valve, a function as a cut valve, and a function as a check valve. Thereby, according to this valve, first, the air passage connecting the fuel tank and the canister can be unified. Second, it is not necessary to attach a plurality of valves having different functions to the fuel tank.
[0017]
In the invention according to claim 2, the third communication portion in the integrated valve for a fuel tank according to claim 1 is constituted by a large-diameter communication hole and a small-diameter communication hole smaller than the large-diameter communication hole. With
A main float contained in the lower chamber such that a float body constituting the vent valve rises due to the inflow of fuel into the lower chamber and closes the large-diameter communication hole from the lower chamber side;
A sub-float accommodated in the lower chamber so as to rise by the inflow of fuel into the lower chamber and close the small-diameter communication hole from the lower chamber side,
The sub-float is raised to a position where the small diameter communication hole is closed when the liquid level of the fuel in the fuel tank reaches a liquid level higher than or equal to a level at which the main float is raised to a position where the large diameter communication hole is closed. It is characterized by having such a configuration.
[0018]
According to this configuration, when the liquid level of the fuel in the fuel tank reaches a liquid level that raises the main float by refueling, first, only the main float can be raised to close the large-diameter communication hole. As a result, since the communication portion between the fuel tank and the ventilation path is only a small-diameter communication hole, the internal pressure in the fuel tank increases, and accordingly, the liquid level of the fuel in the filler tube also increases, and the fuel nozzle The sensor on the side can detect the full state.
[0019]
Once refueling by the fuel nozzle is stopped by this detection, the internal pressure of the fuel tank is reduced by ventilation through the small-diameter communication hole, and accordingly, the liquid level of the fuel in the filler tube also decreases, and the fuel nozzle side The detection of the sensor full state is released.
[0020]
Then, additional refueling is performed, and when the liquid level of the fuel in the fuel tank reaches a liquid level that raises the sub-float by the additional re-fueling, the sub-float rises and the small-diameter communication hole is closed. As a result, the communication portion between the fuel tank and the ventilation path disappears, so that the internal pressure in the fuel tank rises again, and accordingly, the liquid level of the fuel in the filler tube also rises again. The full tank can be detected again.
[0021]
In the invention according to claim 3, the integrated valve for a fuel tank according to claim 1 or 2 is further provided.
A fourth communication portion that communicates the upper space with the lower chamber or the fuel tank without interposing the intermediate chamber is provided,
A relief valve structure for opening the valve when the fourth communication portion is in a constant high pressure state in the fuel tank and for communicating the lower chamber or the inside of the fuel tank with the upper space via the fourth communication portion; It is characterized by being closed by.
[0022]
According to this configuration, the upper space side has a lower pressure than that of the lower chamber, that is, the fuel tank, and therefore, the float constituting the vent valve despite the fuel flowing out of the lower chamber as described above. If a force is applied to the valve body of the body so as to stick to the third communication portion and the pressure in the fuel tank is at a level at which the relief valve structure is opened, the relief valve The closed state of the fourth communication portion by the component is released, the pressure difference between the fuel tank side and the upper space is eliminated, and the float constituting the vent valve can be lowered.
[0023]
In the invention according to claim 4, the check valve structure of the integrated valve for a fuel tank according to claim 1, 2, or 3 is:
A hollow valve body that is housed in the intermediate chamber so as to be able to move up and down and has ventilation holes at its upper and lower parts,
Biasing means for constantly biasing the hollow valve body upward with a predetermined force to press the upper portion of the hollow valve body against the first communication portion;
A ball body accommodated in the hollow valve body in a state in which the lower vent hole of the hollow valve body is allowed to move from a position of closing the hollow valve body from the inside to a position where it is not closed. It is characterized by having.
[0024]
According to this configuration, the ball body normally closes the lower air hole of the hollow valve body from the inside of the hollow valve body due to its own weight.
At the same time, the upper portion of the hollow valve body is pressed against the first communication portion by the urging of the urging means, and closes the first communication portion from the intermediate chamber side.
As a result, the intermediate chamber is normally communicated with the lower chamber via the second communication portion, but is not communicated with the intermediate chamber and the upper space. Therefore, the communication between the lower chamber and the upper space is the second communication. Not by communication.
When the internal pressure in the fuel tank becomes a constant high pressure state and becomes larger than the force of the ball due to its own weight to keep the ball from the intermediate chamber side at a position to close the ventilation hole at the lower part of the hollow valve body, the ball becomes It is moved upward or to the side and the lower vent is opened. In this case, since the ventilation hole is formed in the upper part of the hollow valve element that closes the first communication part, the ventilation from the fuel tank side to the upper space side is performed through the inside of the hollow valve element, Internal pressure can be reduced.
On the other hand, the internal pressure in the fuel tank becomes a constant low pressure state, and the hollow valve body is pushed downward by a force that pushes the hollow valve body from the side of the intermediate chamber to a position that closes the first communication portion. When the force to be applied increases, the hollow valve body is moved downward against the urging of the urging means, the first communication portion is opened, and the fuel tank passes through between the hollow valve body and the intermediate chamber surface. The ventilation from the side to the upper space side is performed, and the internal pressure of the fuel tank can be reduced.
When the internal pressure of the fuel tank rises to a predetermined value, the hollow valve body is again moved upward by the urging of the urging means, and closes the first communication portion from the side of the intermediate chamber.
[0025]
In the invention according to claim 5, the integrated valve for a fuel tank has the following configurations (1) to (15).
(1) an upper space communicating with an air passage to the canister;
(2) a lower chamber disposed in the fuel tank;
(3) an intermediate room provided between the upper space and the lower room;
(4) a first communication section for communicating the upper space with the intermediate chamber;
(5) a second communication section for communicating the intermediate chamber and the lower chamber;
(6) a third communication part for communicating the upper space and the lower chamber without interposing the intermediate chamber;
(7) a float body constituting a cut valve housed in the lower chamber so as to rise due to the inflow of fuel into the lower chamber and close the second communication portion from the lower chamber side;
(8) a float that constitutes a vent valve housed in the lower chamber so as to rise due to the inflow of fuel into the lower chamber and close the third communication section from the lower chamber side;
(9) A check valve structure for opening the valve and communicating the lower chamber and the upper space via the intermediate chamber when the fuel tank is housed in the intermediate chamber and the inside of the fuel tank becomes a constant high pressure state or a constant low pressure state. And having
(10) When the liquid level of the fuel in the fuel tank reaches a liquid level higher than or equal to the level at which the float in the fuel tank rises to a position where the third communication portion is closed. In, it is configured to be raised to a position to close the second communication portion,
(11) Moreover, it has an upper case body, a first lower case body, a second lower case body, a first stopper, and a second stopper.
(12) At the bottom of the upper case body,
A first lower opening portion to which one of the first lower case body and the first plug body is fitted,
A second lower opening portion to which one of the second lower case body and the second plug body is fitted,
(13) At least one of the first lower case body and the first plug body is fitted to the upper case body, and the one of the second lower case body and the second plug body is fitted to the upper case body. While the space is formed,
(14) The first lower case body forms a lower chamber for housing the float body constituting the vent valve,
(15) The intermediate chamber and the lower chamber for accommodating the float constituting the cut valve are formed by the second lower case body.
[0026]
According to this configuration, when the liquid level of the fuel in the fuel tank reaches a level that raises the float constituting the vent valve, the third communication portion is closed by the float. As a result, the internal pressure in the fuel tank is increased, the liquid level of the fuel in the filler tube is increased, and the sensor on the fueling nozzle side can detect that the fuel tank is full.
[0027]
When the inside of the fuel tank becomes a constant high pressure state or a constant low pressure state in a state where the third communication portion is closed by the float body constituting the vent valve in this manner, the check valve structure is opened. By operating the valve, the fuel tank communicates with the ventilation path to the canister, so that the pressure in the fuel tank does not become higher than a predetermined pressure range or lower than a predetermined pressure range. can do.
[0028]
If the level of fuel in the fuel tank reaches a level that raises the float that forms the cut valve due to the vehicle tilting or the vehicle rolling over in an accident, the float that forms the vent valve The body blocks the air passage to the canister, and the float that constitutes the cut valve separates the portion normally closed by the check valve structure. In such a case, fuel does not flow into the air passage side of the canister. You can do so.
[0029]
That is, such a valve is a single valve, but has a function as a vent valve, a function as a cut valve, and a function as a check valve. Thereby, according to this valve, first, the air passage connecting the fuel tank and the canister can be unified. Second, it is not necessary to attach a plurality of valves having different functions to the fuel tank.
[0030]
Further, such a valve exhibits a function as a vent valve, a function as a cut valve, and a function as a check valve by assembling the first lower case body and the second lower case body.
Also, by assembling the first lower case body and the second plug body, a function as a vent valve is exhibited.
Also, by assembling the first plug body and the second lower case body, a function as a cut valve and a function as a check valve are exhibited.
That is, such a valve may be provided with all of the above three functions or a part thereof as necessary.
[0031]
Further, in the invention according to claim 6, the third communication portion in the fuel tank integrated valve according to claim 5 includes a large-diameter communication hole and a small-diameter communication hole smaller than the large-diameter communication hole. With
A main float contained in the lower chamber such that a float body constituting the vent valve rises due to the inflow of fuel into the lower chamber and closes the large-diameter communication hole from the lower chamber side;
A sub-float accommodated in the lower chamber so as to rise by the inflow of fuel into the lower chamber and close the small-diameter communication hole from the lower chamber side,
The sub-float is raised to a position where the small diameter communication hole is closed when the liquid level of the fuel in the fuel tank reaches a liquid level higher than or equal to a level at which the main float is raised to a position where the large diameter communication hole is closed. It is configured as
Moreover, the first lower case body is characterized in that a lower chamber for accommodating the main float and the sub-float constituting the vent valve is formed.
[0032]
According to this configuration, when the liquid level of the fuel in the fuel tank reaches a liquid level that raises the main float by refueling, first, only the main float can be raised to close the large-diameter communication hole. As a result, since the communication portion between the fuel tank and the ventilation path is only a small-diameter communication hole, the internal pressure in the fuel tank increases, and accordingly, the liquid level of the fuel in the filler tube also increases, and the fuel nozzle The sensor on the side can detect the full state.
[0033]
Once refueling by the fuel nozzle is stopped by this detection, the internal pressure of the fuel tank is reduced by ventilation through the small-diameter communication hole, and accordingly, the liquid level of the fuel in the filler tube also decreases, and the fuel nozzle side The detection of the sensor full state is released.
[0034]
Therefore, additional refueling is performed, and when the liquid level of the fuel in the fuel tank reaches a liquid level that raises the sub-float by the additional re-fueling, the sub-float rises and the small-diameter communication hole is closed. As a result, the communication portion between the fuel tank and the ventilation path disappears, so that the internal pressure in the fuel tank rises again, and accordingly, the liquid level of the fuel in the filler tube also rises again. The full tank can be detected again.
[0035]
Further, such a valve exhibits a function as a vent valve, a function as a cut valve, and a function as a check valve by assembling the first lower case body and the second lower case body.
Also, by assembling the first lower case body and the second plug body, a function as a vent valve is exhibited.
Also, by assembling the first plug body and the second lower case body, a function as a cut valve and a function as a check valve are exhibited.
That is, such a valve may be provided with all of the above three functions or a part thereof as necessary.
[0036]
Further, in the invention according to claim 7, the integrated valve for a fuel tank according to claim 5 or 6 is further provided.
A fourth communication portion that communicates the upper space with the lower chamber or the fuel tank without interposing the intermediate chamber is provided,
A relief valve structure in which the fourth communication portion opens a valve when the inside of the fuel tank becomes a constant high pressure state and communicates the lower chamber or the inside of the fuel tank with the upper space through the fourth communication portion. It is characterized by being closed by.
[0037]
According to this configuration, the upper space side has a lower pressure than that of the lower chamber, that is, the fuel tank, and therefore, the float constituting the vent valve despite the fuel flowing out of the lower chamber as described above. If a force is applied to the valve body of the body so as to stick to the third communication portion and the pressure in the fuel tank is at a level at which the relief valve structure is opened, the relief valve The closed state of the fourth communication portion by the component is released, the pressure difference between the fuel tank side and the upper space is eliminated, and the float constituting the vent valve can be lowered.
[0038]
In the invention according to claim 8, the check valve structure in the fuel tank integrated valve according to claim 5, claim 6, or claim 7 is as follows.
A hollow valve body that is housed in the intermediate chamber so as to be able to move up and down and has ventilation holes at its upper and lower parts,
Biasing means for constantly biasing the hollow valve body upward with a predetermined force to press the upper portion of the hollow valve body against the first communication portion;
A ball body accommodated in the hollow valve body in a state in which the lower vent hole of the hollow valve body is allowed to move from a position of closing the hollow valve body from the inside to a position where it is not closed. It is characterized by having.
[0039]
According to this configuration, the ball body normally closes the lower air hole of the hollow valve body from the inside of the hollow valve body due to its own weight.
At the same time, the upper portion of the hollow valve body is pressed against the first communication portion by the urging of the urging means, and closes the first communication portion from the intermediate chamber side.
As a result, the intermediate chamber is normally communicated with the lower chamber via the second communication portion, but is not communicated with the intermediate chamber and the upper space. Therefore, the communication between the lower chamber and the upper space is the second communication. Not by communication.
When the internal pressure in the fuel tank becomes a constant high pressure state and becomes larger than the force of the ball due to its own weight to keep the ball from the intermediate chamber side at a position to close the ventilation hole at the lower part of the hollow valve body, the ball becomes It is moved upward or to the side and the lower vent is opened. In this case, since the ventilation hole is formed in the upper part of the hollow valve element that closes the first communication part, the ventilation from the fuel tank side to the upper space side is performed through the inside of the hollow valve element, Internal pressure can be reduced.
On the other hand, the internal pressure in the fuel tank becomes a constant low pressure state, and the hollow valve body is pushed downward by a force that pushes the hollow valve body from the side of the intermediate chamber to a position that closes the first communication portion. When the force to be applied increases, the hollow valve body is moved downward against the urging of the urging means, the first communication portion is opened, and the fuel tank passes through between the hollow valve body and the intermediate chamber surface. The ventilation from the side to the upper space side is performed, and the internal pressure of the fuel tank can be reduced.
When the internal pressure of the fuel tank rises to a predetermined value, the hollow valve body is again moved upward by the urging of the urging means, and closes the first communication portion from the side of the intermediate chamber.
[0040]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a typical embodiment of the present invention will be described with reference to FIGS.
[0041]
In addition, although the example shown in each figure of FIGS. 4-6 differs from the example shown in each figure of FIGS. 1-3, a part of structure differs, However, a part other than the difference of this structure differs. Since both have substantially the same configuration, the substantially same components will be denoted by the same reference numerals in the respective drawings.
In addition, the example shown in each of FIGS. 7 to 11 differs from the example shown in each of FIGS. 1 to 3 in a part of the configuration, but is different from the example shown in each of FIGS. Since both have substantially the same configuration, the substantially same components will be denoted by the same reference numerals in the respective drawings.
[0042]
The valve according to this embodiment is used for connecting a fuel tank and a ventilation path to a canister.
[0043]
Such a valve has an upper space 1 connected to an air passage to the canister, and a lower chamber 2 connected to the upper space 1 through communication portions 4, 5, and 6, which will be described later. Then, it is used by being attached to the fuel tank in a state where it is entirely inserted in the fuel tank T or in a state where the lower chamber 2 side is inserted in the fuel tank T. Alternatively, it is used by being attached to an upper part of a sender module (a member that is integrated into a fuel tank by integrating a fuel pump, a fuel gauge, a suction filter, a fuel filter, and the like). (The concept of the inside of the fuel tank T in this specification includes the inside of this sender module.)
[0044]
Further, such a valve has a float body 100 constituting a vent valve, a float body 110 constituting a cut valve, and a check valve constituting body 111 integrally in the lower chamber 2.
[0045]
Thus, according to such a valve, the fuel level of the fuel in the fuel tank T is maintained at a constant level (hereinafter, referred to as a first liquid level L1.) / The first liquid level in FIGS. L1 is represented by a dashed line.) At this stage, the internal pressure of the fuel tank is increased by interrupting or decreasing the airflow to the air passage of the canister by the float body 100 constituting the vent valve. By raising the liquid level of the fuel inside, the sensor on the refueling nozzle side detects that the fuel tank is full, so that supercharging can be prevented.
[0046]
Further, in the valve according to this embodiment, the internal pressure of the fuel tank after the sensor at the refueling nozzle is once detected to be full and the automatic refueling by the refueling nozzle is stopped as described above. The level of the fuel in the fuel tank T is higher than the first liquid level L1 by a certain level (hereinafter, referred to as “refueling nozzle”). When the liquid level reaches the second liquid level L2 (this second liquid level L2 is represented by a dashed line in FIGS. 1 and 4), the float body 100 constituting the vent valve is used to enter the canister ventilation path. The internal pressure of the fuel tank is increased by shutting off the ventilation of the fuel tank, and the increase in the internal pressure causes the fuel level in the filler tube to rise again and the sensor on the refueling nozzle side to be filled again. It is detected, and has, and has a function of preventing overfilling of the additional lubrication.
[0047]
Further, according to such a valve, the T in the fuel tank becomes a constant high-pressure state or a constant low-pressure state in a state in which the air passage to the canister is blocked by the float body 100 constituting the vent valve as described above. In this case, the check valve assembly 111 opens the valve to communicate the fuel tank with the air passage to the canister, whereby the pressure in the fuel tank T becomes higher than a predetermined pressure range, It has a function of preventing the pressure from becoming lower than a predetermined pressure range.
[0048]
In addition, according to the valve, when the liquid level of the fuel in the fuel tank T rises to the second liquid level L2 or more due to the inclination of the vehicle or the rollover of the vehicle at the time of the accident, the venting is performed. The float body 100 constituting the valve blocks the air passage to the canister, and the float body 110 constituting the cut valve separately blocks the portion normally closed by the check valve body 111. Has a function of preventing fuel from flowing into the ventilation path side of the fuel cell. (Hereinafter, the liquid level at which the cut valve is raised is referred to as a third liquid level L3./In FIGS. 1 and 4, the third liquid level L3 is indicated by a two-dot chain line.)
[0049]
That is, the valve according to this embodiment is:
(1) an upper space 1 communicated with an air passage to a canister;
(2) a lower chamber 2 disposed in the fuel tank T;
(3) an intermediate room 3 provided between the upper space 1 and the lower room 2,
(4) a first communication portion 4 for communicating the upper space 1 with the intermediate chamber 3,
(5) a second communication section 5 for communicating the intermediate chamber 3 with the lower chamber 2;
(6) a third communication part 6 for communicating the upper space 1 and the lower chamber 2 without the intermediate chamber 3 interposed therebetween;
(7) a float body 110 constituting a cut valve housed in the lower chamber 2 so as to rise due to the inflow of fuel into the lower chamber 2 and close the second communication portion 5 from the lower chamber 2 side;
(8) a float body 100 which constitutes a vent valve housed in the lower chamber 2 so as to rise by the inflow of fuel into the lower chamber 2 and close the third communication section 6 from the lower chamber 2 side;
(9) When the fuel tank T is housed in the intermediate chamber 3 and the inside T of the fuel tank becomes a constant high pressure state or a constant low pressure state, the valve is opened to communicate the lower chamber 2 and the upper space 1 via the intermediate chamber 3. And a check valve structure 111 to be operated.
(10) Then, the float body 110 constituting the cut valve has a liquid level at which the liquid level of the fuel in the fuel tank T raises the float body 100 constituting the vent valve to a position at which the third communication portion 6 is closed. It is configured to be raised to a position where the second communication portion 5 is closed when the surface level is reached.
[0050]
In the illustrated example, the upper space 1 includes an upper wall and a side wall, and is formed by a space in the upper component 10 that is formed in an airtight state. A connection portion 11 to which a tube, a pipe, or the like that forms a ventilation path to the canister is connected is formed on a side wall of the upper configuration portion 10. Through this connection portion 11, the upper space 1 and the ventilation path communicate with each other. Connected to.
[0051]
On the other hand, in the illustrated example, the lower chamber 2 has a top part 21, a bottom part 22, and a side part 23, and is constituted by a case body in which the float bodies 100 and 110 are accommodated.
[0052]
The lower chamber 2 is integrally connected to a lower portion of the upper component 10 at a top portion 21 thereof. The second communication part 5 and the third communication part 6 are formed in the top part 21.
[0053]
Further, in the illustrated example, a fuel inflow hole 24 is formed in the bottom portion 22 and the side portion 23 of the lower chamber 2 so that fuel can flow into the lower chamber 2 through the inflow hole 24. Has become.
[0054]
Further, in the illustrated example, an intermediate chamber 3 is formed above the second communication portion 5. In the illustrated example, the intermediate chamber 3 is formed in the upper space 1 in a concave portion 30 which is recessed downward from the upper space 1 so as to have the top 21 of the lower chamber 2 in which the second communication portion 5 is formed as a bottom. Is closed by a lid 31 in an airtight state. The lid 31 has the first communication portion 4 formed therein, and the intermediate chamber 3 houses the check valve component 111.
[0055]
In the lower chamber 2 configured as described above, a float body 110 constituting the cut valve and a float body 100 constituting the vent valve are accommodated.
[0056]
The floating bodies 100 and 110 are constantly applied with a constant upward biasing force even at the lowered position by a compression coil spring 112 interposed between the lower side and the bottom 22 of the lower chamber 2.
[0057]
Further, each of the floats 100, 110 has a valve body 113 at the upper part thereof for closing the communication parts 5, 6 from the lower chamber 2 side at the ascending position.
[0058]
When the liquid level of the fuel in the fuel tank T reaches a level at which the float 100 constituting the vent valve rises, the float 100 closes the third communication portion 6. Thus, the internal pressure in the fuel tank T is increased, the liquid level of the fuel in the filler tube is increased, and the sensor on the refueling nozzle side can detect that the fuel tank is full.
[0059]
In the state where the inside T of the fuel tank becomes a constant high pressure state or a constant low pressure state in a state where the third communication portion 6 is closed by the float body 100 constituting the vent valve in this manner, a check valve structure is provided. The body 111 opens the valve to communicate the fuel tank with the air passage to the canister, so that the pressure in the fuel tank T becomes a high pressure above a predetermined pressure range or a low pressure below a predetermined pressure range. Can be prevented.
[0060]
When the level of the fuel in the fuel tank T reaches a level at which the float body 110 constituting the cut valve rises due to inclination of the vehicle or rollover of the vehicle at the time of an accident, a vent valve is provided. In addition, the air passage to the canister is shut off by the float body 100 that is closed, and the portion normally closed by the check valve structure 111 is separately closed by the float body 110 that forms the cut valve. Can be prevented from flowing into the fuel.
[0061]
That is, such a valve is a single valve, but has a function as a vent valve, a function as a cut valve, and a function as a check valve. Thereby, according to this valve, first, the air passage connecting the fuel tank and the canister can be unified. Second, it is not necessary to attach a plurality of valves having different functions to the fuel tank.
[0062]
Also, in the illustrated example,
(1) The third communication portion 6 is constituted by a large-diameter communication hole 6a and a small-diameter communication hole 6b smaller than the large-diameter communication hole 6a.
(2) The float body 100 constituting the vent valve is accommodated in the lower chamber 2 so as to rise due to the inflow of fuel into the lower chamber 2 and close the large-diameter communication hole 6a from the lower chamber 2 side. A main float 101,
(3) It is constituted by the sub-float 102 accommodated in the lower chamber 2 so as to rise by the inflow of fuel into the lower chamber 2 and close the small-diameter communication hole 6b from the lower chamber 2 side.
(4) When the sub-float 102 reaches the liquid level above the level at which the fuel in the fuel tank T rises to a position at which the main float 101 closes the large-diameter communication hole 6a, the small-diameter communication is performed. The hole 6b is raised to a position where the hole 6b is closed.
[0063]
Specifically, in the illustrated example, the lower chamber 2 is divided into three sections by a vertical partition wall 25 extending between the top section 21 and the bottom section 22.
[0064]
In the illustrated example, the main float 101 is provided in the first chamber 2a, the sub-float 102 is provided in the second chamber 2b, and the cut valve is provided in the third chamber 2c. Is stored.
[0065]
In the illustrated example, the first chamber 2a and the second chamber 2b have a ventilation section 26 above the first liquid level L1, and the third chamber 2c has The ventilation part 26 is formed above the three liquid level L3.
[0066]
When the fuel level in the fuel tank T reaches the first liquid level L1 due to refueling, only the main float 101 rises and the large-diameter communication hole 6a is closed. As a result, the communication portion between the fuel tank and the air passage is only the small-diameter communication hole 6b of the second chamber 2b, so that the internal pressure in the fuel tank T increases, and accordingly, the liquid level of the fuel in the filler tube increases. The level also rises, and the sensor on the fuel nozzle side can detect fullness.
[0067]
Once refueling by the fuel nozzle is temporarily stopped by this detection, the internal pressure of the fuel tank decreases due to ventilation through the small-diameter communication hole 6b of the second chamber 2b, and accordingly, the liquid level of the fuel in the filler tube also decreases. Then, the detection of the full state of the sensor on the fuel nozzle side is released.
[0068]
Then, additional refueling is performed, and when the liquid level of the fuel in the fuel tank T reaches the second liquid level L2 due to the additional refueling, the sub-float 102 rises and the small-diameter communication hole 6b is closed. As a result, the communication portion between the fuel tank and the ventilation path is eliminated, so that the internal pressure in the fuel tank T increases again, and accordingly, the liquid level of the fuel in the filler tube also increases again. Can be detected again.
[0069]
When the liquid level of the fuel in the fuel tank T decreases due to the consumption of the fuel, the fuel in the lower chamber 2 flows out through the inlet hole 24, whereby the main float 101 and the sub float 102 descend by their own weights, Both the radial communication hole 6a and the small diameter communication hole 6b are opened. The pressure in the upper space 1 is lower than that in the lower chamber 2, that is, in the fuel tank T, so that even when the fuel in the lower chamber 2 flows out, the valve body 113 of these floats is Even if a force that sticks to the communication hole is applied, the small-diameter communication hole 6b is smaller than the large-diameter communication hole 6a, so that the small-diameter communication hole 6b acts on the valve body 113 of the sub-float 102 that closes the small-diameter communication hole 6b. Since the main force is smaller than such a force applied to the valve body 113 of the main float 101 that closes the large-diameter communication hole 6a, the sub-float 102 first descends, and the internal pressure of the fuel tank is reduced. The main float 101 also descends without hindrance. That is, in the illustrated example, while the large-diameter communication hole 6a closed by the main float 101 is configured to have a large diameter so that the fuel can be supplied efficiently, the main float when the liquid level of the fuel drops is reduced. The descent of 101 can be performed smoothly.
[0070]
Further, in the example shown in FIG. 1, there is provided a fourth communication portion 7 that allows the upper space 1 to communicate with the lower chamber 2 or the inside of the fuel tank T without the intermediate chamber 3 interposed therebetween.
The fourth communication portion 7 opens the valve when the inside T of the fuel tank becomes a constant high pressure state, and connects the lower chamber 2 or the inside T of the fuel tank and the upper space 1 through the fourth communication portion 7. It is closed by the relief valve structure 114 to be communicated.
[0071]
In this example, the fourth communication portion 7 is provided with a lower end opening 7a at a location of the upper component 10 having the upper space 1 therein, the lower end opening 7a protruding from the side of the lower chamber 2 to the side. 7b is configured as an air passage formed in a side portion of the upper component 10 so as to face the upper space 1.
[0072]
Further, in this example, the air passage forming the fourth communication portion 7 is divided into a large diameter portion 7c and a small diameter portion 7d, and a lower end opening 7a is provided on the small diameter portion 7d side. An upper end opening 7b is provided on the 7c side.
[0073]
The relief valve structure 114 is accommodated in the large diameter portion 7c. In the example shown in the figure, the relief valve structure 114 is a ball body which slightly closes the inner diameter of the large diameter portion 7c which closes the communication point between the large diameter portion 7c and the small diameter portion 7d from the large diameter portion 7c side. A compression coil spring 114b interposed between the ball body 114a and an upper part of an air passage forming the fourth communication part 7 so as to urge the ball body 114a in a direction for constantly pressing the ball body 114a against the communication part. It is composed of
[0074]
As a result, in the example shown in FIG. 1, the pressure in the upper space 1 is lower than that in the lower chamber 2, that is, in the fuel tank T, so that the fuel in the lower chamber 2 flows out as described above. Despite this, a force is applied to the valve body portion 113 of the float body 100 constituting the vent valve so as to stick to the third communication portion 6, and the pressure in the fuel tank T is reduced by the relief valve. If the height is such that the component 114 is opened, (in the illustrated example, the pressure in the fuel tank T causes the ball 114a to press the ball 114a downwards due to the biasing force of the spring 114b and the weight of the ball 114a. (When the height of the body 114a exceeds the force that tends to stay below) The closed state of the fourth communication portion 7 by the relief valve structure 114 is released to reduce the pressure difference between the fuel tank side and the upper space 1. And, it is possible to lower the float body 100 constituting the vent valve.
[0075]
In the illustrated example, the check valve member 111 is
(1) a hollow valve body 111a housed in the intermediate chamber 3 so as to be movable up and down and having vent holes 111b at its upper and lower parts, respectively;
(2) urging means 111d which constantly urges the hollow valve body 111a upward with a predetermined force to press the upper portion of the hollow valve body 111a against the first communication portion 4;
(3) Put in the hollow valve body 111a in a state where the air hole 111b at the lower part of the hollow valve body 111a is allowed to move from a position where it is closed from the inside of the hollow valve body 111a to a position where it is not closed. Ball body 111f provided.
In the illustrated example, the intermediate chamber 3 that houses the hollow valve body 111a is provided with a side rib 32 that constantly forms a ventilation gap between the outer side surface of the hollow valve body 111a and the inner side surface of the intermediate chamber 3. ing.
[0076]
The urging means 111d is constituted by a compression coil spring 111e interposed between the bottom of the intermediate chamber 3 and the lower part of the hollow valve body 111a.
[0077]
Further, the inner bottom portion 111c of the hollow valve body 111a is formed in a mortar shape, and a ventilation hole 111b below the hollow valve body 111a is formed in the bottom of the mortar-shaped inner bottom portion 111c.
[0078]
Also, the upper and lower inner surface dimensions and the left and right inner surface dimensions of the hollow valve body 111a are larger than the outer diameter dimension of the ball body 111f.
[0079]
Due to this, the ball body 111f is normally positioned at the center of the inner bottom part 111c of the hollow valve body 111a having a mortar shape by its own weight, and the lower air hole 111b is formed inside the hollow valve body 111a. Block from.
[0080]
At the same time, the upper part of the hollow valve element 111a is pressed against the first communication part 4 by the bias of the spring 111e, and closes the first communication part 4 from the intermediate chamber 3 side.
[0081]
Accordingly, the intermediate chamber 3 is normally communicated with the lower chamber 2, in the illustrated example, via the second communication section 5 with the third chamber 2 c containing the cut valve. The space 1 is not communicated, and therefore, the communication between the lower chamber 2 and the upper space 1 is not made by the second communication portion 5.
[0082]
The internal pressure of the fuel tank T becomes a constant high pressure state, and the force of the ball 111f due to its own weight causes the ball 111f to remain at a position from the side of the intermediate chamber 3 to close the ventilation hole 111b below the hollow valve body 111a. When it becomes larger, the ball body 111f is moved upward or to the side, and the lower air hole 111b is opened. In this case, since the ventilation hole 111b is formed in the upper part of the hollow valve body 111a that closes the first communication part 4, the ventilation from the fuel tank side to the upper space 1 side through the inside of the hollow valve body 111a. Thus, the internal pressure of the fuel tank can be reduced.
[0083]
In the illustrated example, since the inner bottom portion 111c of the hollow valve body 111a has a mortar shape, when the internal pressure of the fuel tank decreases to a predetermined value, the ball body 111f returns to the center of the inner bottom portion 111c again, and the lower vent hole is formed. 111b is closed from the inside of this hollow valve body 111a. In the example shown in the figure, the ball 111f can be moved by such a vibration even when the vehicle is running, and the fuel tank can be opened as much as possible when the vehicle is running.
[0084]
On the other hand, the internal pressure in the fuel tank T becomes a constant low pressure state, and the urging means 111d, that is, the hollow valve body 111a by the spring 111e is pushed up from the intermediate chamber 3 side to a position where the first communication portion 4 is closed. When the force for pushing down the hollow valve body 111a is larger than the force to be applied, the hollow valve body 111a is moved downward against the urging of the urging means 111d, and the first communication part 4 is opened. It is. Even when the hollow valve body 111a moves downward as described above, a bottom rib 33 for forming a ventilation gap between the lower portion of the hollow valve body 111a and the bottom 22 of the intermediate chamber 3 is provided on the bottom 22 of the intermediate chamber 3. In this case, ventilation is performed from the fuel tank side to the upper space 1 side between the hollow valve body 111a and the inner surface of the intermediate chamber 3 so that the internal pressure of the fuel tank can be reduced. . (FIGS. 3, 6, and 9)
[0085]
When the internal pressure of the fuel tank rises to a predetermined value, the hollow valve body 111a is moved upward again by the urging of the urging means 111d, and closes the first communication part 4 from the side of the intermediate chamber 3.
[0086]
In addition, in the example shown in FIG. 4, the third chamber 2 c containing the cut valve and the intermediate chamber 3 are provided with a bypass portion 8 that communicates at a different position from the second communication portion 5.
The relief valve structure 115 allows the bypass portion 8 to open when the fuel tank T has a constant high pressure state and to communicate the third chamber 2 c and the intermediate chamber 3 via the bypass portion 8. It is closed.
[0087]
In this example, the bypass portion 8 has a lower end opening 8a at the upper part of the third chamber 2c and is formed as a ventilation passage formed on the side of the intermediate chamber 3 so that the upper end opening 8b faces the intermediate chamber 3. I have.
[0088]
Further, in this example, the ventilation path constituting the bypass portion 8 is divided into a large diameter portion 8c and a small diameter portion 8d, and a lower end opening 8a is provided on the small diameter portion 8d side, and the large diameter portion 8c side is provided. Is provided with an upper end opening 8b.
[0089]
The relief valve structure 115 is accommodated in the large diameter portion 8c. In the example shown in the figure, the relief valve structure 115 is a ball body having a diameter slightly smaller than the inner diameter of the large-diameter portion 8c that closes a communication point between the large-diameter portion 8c and the small-diameter portion 8d from the large-diameter portion 8c side. 115a and a compression coil spring 115b interposed between the ball body 115a and the upper part of the ventilation path constituting the bypass portion 8 so as to constantly urge the ball body 115a against the communicating portion. It is configured.
[0090]
Thereby, in the example shown in FIG. 4, the fuel in the fuel tank T reaches the third liquid level L3, the main float 101 closes the large-diameter communication hole 6a, and the sub-float 102 communicates with the small-diameter communication hole. After the hole 6b is closed and the float body 110 forming the cut valve closes the second communication portion 5, the upper space 1 side is lower than the third liquid level L3 even though the fuel level is lower than the third liquid level L3. The pressure is lower than that of the chamber 2, that is, the fuel tank T, so that the main float 101, the sub-float 102, and the float body 110 constituting the cut valve despite the decrease in the fuel level as described above. In any of the above, a force for preventing a descent for releasing the blockage is applied, and the pressure in the fuel tank T is high enough to open the relief valve structure 115. In the example shown in the figure, (in the illustrated example, the pressure in the fuel tank T causes the biasing force of the spring 115b pressing the ball 115a downward and the force of the ball 115a to stay downward due to the weight of the ball 115a. (When the height exceeds the maximum height), the closed state of the bypass portion 8 by the relief valve structure 115 is released, and the ventilation from the third chamber 2c side to the intermediate chamber 3 is performed, whereby the float body constituting the cut valve is formed. 110 can be lowered. In such a case, since the internal pressure of the fuel tank T is still high even when the float body 110 constituting the cut valve is lowered, the ball body 111f constituting the check valve body 111 is replaced with the ball body 111f. The lower chamber 2 and the upper space 1 are communicated with each other so as to release the blockage of the lower air hole 111b of the hollow valve body 111a, and if the fuel level is lower than the first liquid level L1, the main float 101 is moved. , The sub-float 102 is also lowered.
[0091]
In the examples shown in FIGS. 7 to 11,
(1) Upper case body 200,
(2) a first lower case body 210;
(3) a second lower case body 230;
(4) a first plug 220;
(5) having a second plug 240;
For such upper case body 200,
By assembling the first lower case body 210 and the second lower case body 230, or by assembling the first lower case body 210 and the second stopper 240, or by assembling the first stopper 220 and the second lower part The valve is configured by assembling the case body 230.
[0092]
That is, in the examples shown in FIGS. 7 to 11, the upper case body 200 is configured to have a case shape in which the lower surface is opened. The interior of the upper case body 200 is divided into two sections by a vertical partition wall 200a. On the upper part of the vertical partition wall 200a, there is formed a communication portion 200b for connecting these two sections. At the same time, in one of the two compartments, a connection 11 to the air passage of the canister is formed.
[0093]
And, in the lower part of the upper case body 200 thus configured,
A first lower opening portion 200c to which one of the first lower case body 210 and the first plug body 220 is fitted;
A second lower opening part 200d to which one of the second lower case body 230 and the second plug body 240 is fitted;
By fitting either one of the first lower case body 210 and the first plug body 220 to the upper case body 200, and fitting one of the second lower case body 230 and the second plug body 240 to each other, The upper space 1 is formed.
[0094]
That is, in the example shown in FIGS. 7 to 11, one lower part of the two sections of the upper case body 200 divided by the partition wall 200a becomes the first lower opening part 200c, and the upper case The other lower portion of the two sections of the body 200 divided by the partition wall 200a is configured to be the second lower opening portion 200d.
[0095]
The first lower case body 210 has an upper side inserted into the upper case body 200 from below through the first lower opening portion 200c, and is detachably attached to the upper case body 200. It is configured to have a cylindrical shape with a diameter. Specifically, the outer diameter of the first lower case 210 and the inner diameter of the first lower opening 200c are configured to be substantially equal. Also, the first lower case body 210 is resiliently inserted into a window hole 200 e formed in the upper case body 200 at a position where the first lower case body 210 is completely fitted into the upper case body 200. An engaging hook 210a to be engaged is formed. A seal ring 210b is fitted on the outside of the first lower case body 210 and above the position where the engaging claw 210a is formed, and the first lower case body 210 is attached to the upper case body 200. When the first lower case body 210 and the upper case body 200 are completely fitted, the first lower case body 210 and the upper case body 200 are combined in a liquid-tight state at the fitted portions.
[0096]
The first plug 220 is fitted to the first lower opening portion 200c from below, and is configured to have an outer diameter that closes the first lower opening portion 200c with a liquid-tight body. . Specifically, the outer diameter of the first plug 220 and the inner diameter of the first lower opening 200c are configured to be substantially equal. Further, on the outer surface of the first plug 220, at a position where the first plug 220 is completely fitted in the upper case body 200, a hook claw that resiliently enters and engages with a window hole 200 e formed in the upper case body 200. 220a are formed. A seal ring 220b is fitted outside the first plug 220 and above the position where the hook 220a is formed, and the first plug 220 is completely fitted into the upper case body 200. In this state, the first plug body 220 and the upper case body 200 are assembled in a liquid-tight state at the fitting portion.
[0097]
Further, the second lower case body 230 has an upper side inserted into the upper case body 200 from below through the second lower opening portion 200d, and has an outer diameter detachably assembled to the upper case body 200. It is constituted so that it may be provided with a cylinder. Specifically, the outer diameter of the second lower case body 230 and the inner diameter of the second lower opening portion 200d are configured to be substantially equal. Also, at the position where the second lower case body 230 has been completely fitted into the upper case body 200, the second lower case body 230 is resiliently inserted into the window hole 200e formed in the upper case body 200 and enters the outer surface of the second lower case body 230. Engagement claws 230a are formed. A seal ring 230b is fitted outside the second lower case body 230 and above the position where the engaging claw 230a is formed, and the second lower case body 230 is fitted into the upper case body 200. In the cut state, the second lower case body 230 and the upper case body 200 are combined in a liquid-tight state at the fitting portions thereof.
[0098]
The second plug 240 is fitted to the second lower opening portion 200d from below, and has an outer diameter that closes the second lower opening portion 200d with a liquid-tight body. Specifically, the outer diameter of the second plug 240 and the inner diameter of the second lower opening 200d are configured to be substantially equal. Further, on the outer surface of the second plug 240, at a position where the second plug 240 is completely fitted into the upper case body 200, the engaging claw resiliently enters and engages with a window hole 200 e formed in the upper case body 200. 240a are formed. A seal ring 240b is fitted outside the second plug 240 and above the position where the engaging claw 240a is formed, and the second plug 240 is completely fitted into the upper case body 200. In this state, the second plug 240 and the upper case body 200 are assembled in a liquid-tight state at the fitting portion.
[0099]
In the example shown in FIGS. 7 to 11, the first lower case body 210 forms the lower chamber 2 for housing the float body 100 constituting the vent valve, and The lower case body 230 forms the intermediate chamber 3 and the lower chamber 2 in which the float body 110 constituting the cut valve is housed.
[0100]
As a result, in the examples shown in FIGS. 7 to 11, the upper case body 200
(1) By assembling the first lower case body 210 and the second lower case body 230, a function as a vent valve, a function as a cut valve, and a function as a check valve are exhibited.
(2) By assembling the first lower case body 210 and the second plug body 240, a function as a vent valve is exhibited.
(3) Alternatively, by assembling the first plug 220 and the second lower case 230, a function as a cut valve and a function as a check valve are exhibited.
[0101]
That is, the valve shown in FIGS. 7 to 11 may be provided with all of the above three functions or a part thereof as necessary.
[0102]
For example, when a vent valve is separately provided in the fuel tank, the function as a cut valve and the function as a check valve can be achieved by assembling the second lower case body 230 and the first plug 220 with the upper case body 200. It can be a valve with only one. (FIG. 11)
When a cut valve is separately provided in the fuel tank, the second plug 240 and the first lower case 210 are assembled to the upper case 200 to provide a valve having only a function as a vent valve. It can be. (FIG. 10)
[0103]
In the valves shown in FIGS. 7 to 11, the first lower case body 210 allows the lower chamber 3 (that is, the first chamber) to accommodate the main float 101 and the sub float 102 that constitute the vent valve. A chamber 2a and a second chamber 2b) are formed.
[0104]
That is, the first lower case body 210 is divided into two by the vertical partition wall, so that the first chamber 2a and the second chamber 2b are provided in the first lower case body 210. It is. A large-diameter communication hole 6a and a small-diameter communication hole 6b constituting the third communication section 6 are formed at the upper end of the first lower case body 210.
[0105]
The second lower case body 230 has the intermediate chamber 3 on its upper side, the third chamber 2c on its lower side, and the first communication part 4 on its upper end. The intermediate chamber 3 and the third chamber 2c are communicated by the second communication section 5. The check valve constituting body 111 is housed in the intermediate chamber 3 of the second lower case body 230, and the float body 110 constituting the cut valve is housed in the third chamber 2c.
[0106]
【The invention's effect】
The fuel tank integrated valve according to the present invention has an upper space communicating with the air passage of the canister, a lower chamber forming a vent valve and a cut valve, and further has an intermediate chamber forming a check valve. Thus, by attaching this valve to the fuel tank and connecting the upper space and the canister by a single ventilation path, the ventilation system of the fuel tank can be completed.
[0107]
That is, according to the valve of the present invention, the air passage connecting the fuel tank and the canister can be unified. Further, it is not necessary to attach a plurality of valves having different functions to the fuel tank.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an example of a valve.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an enlarged view of a main part of FIG. 1 (hollow valve body 111a lowered).
FIG. 4 is a sectional view showing another example of the valve.
FIG. 5 is an enlarged view of a main part of FIG. 4;
FIG. 6 is an enlarged view of a main part of FIG. 4 (hollow valve body 111a lowered).
FIG. 7 is a sectional configuration view showing still another example of the valve.
8 is an enlarged view of a main part of FIG. 7;
9 is an enlarged view of a main part of FIG. 7 (hollow valve body 111a lowered).
FIG. 10 is a cross-sectional configuration diagram showing a state in which the first lower case body 210 and the second plug body 240 are assembled to the upper case body 200 to form a valve.
FIG. 11 is a sectional configuration diagram showing a state in which a second lower case body 230 and a first plug body 220 are assembled to the upper case body 200 to form a valve.
[Explanation of symbols]
1 Upper space
2 Lower room
3 Intermediate room
4 first communication department
5 second communication department
6 third communication department
100 Float body constituting vent valve
110 Float body constituting cut valve
111 Check valve assembly
T inside the fuel tank

Claims (8)

An upper space communicating with the air passage to the canister,
A lower chamber arranged in the fuel tank,
An intermediate room provided between the upper space and the lower room,
A first communication part for communicating the upper space with the intermediate chamber,
A second communication portion for communicating the intermediate chamber and the lower chamber,
A third communication portion that communicates the upper space and the lower chamber without interposing the intermediate chamber,
A float that constitutes a cut valve housed in the lower chamber so as to rise by the inflow of fuel into the lower chamber and close the second communication portion from the lower chamber side;
A float that constitutes a vent valve housed in the lower chamber so as to rise by the inflow of fuel into the lower chamber and close the third communication part from the lower chamber side;
A check valve structure that is housed in the intermediate chamber and opens the valve when the fuel tank reaches a certain high pressure state or a certain low pressure state to communicate the lower chamber and the upper space via the intermediate chamber. And
At the stage where the liquid level of the fuel in the fuel tank reaches a liquid level higher than or equal to the level at which the float level of the fuel in the fuel tank rises to a position at which the third communication portion is closed, An integrated valve for a fuel tank, wherein the integrated valve is configured to be raised to a position where the two communication portions are closed. The third communication portion is constituted by a large-diameter communication hole and a small-diameter communication hole smaller than the large-diameter communication hole,
A main float contained in the lower chamber such that a float body constituting the vent valve rises due to the inflow of fuel into the lower chamber and closes the large-diameter communication hole from the lower chamber side;
A sub-float accommodated in the lower chamber so as to rise by the inflow of fuel into the lower chamber and close the small-diameter communication hole from the lower chamber side,
The sub-float is raised to a position where the small diameter communication hole is closed when the liquid level of the fuel in the fuel tank reaches a liquid level higher than or equal to a level at which the main float is raised to a position where the large diameter communication hole is closed. The integrated valve for a fuel tank according to claim 1, wherein the valve is configured as follows. A fourth communication portion that communicates the upper space with the lower chamber or the fuel tank without interposing the intermediate chamber is provided,
A relief valve structure for opening the valve when the fourth communication portion is in a constant high pressure state in the fuel tank and for communicating the lower chamber or the inside of the fuel tank with the upper space via the fourth communication portion; The integrated valve for a fuel tank according to claim 1 or 2, wherein the valve is closed by: Check valve structure,
A hollow valve body that is housed in the intermediate chamber so as to be able to move up and down and has ventilation holes at its upper and lower parts,
Biasing means for constantly biasing the hollow valve body upward with a predetermined force to press the upper portion of the hollow valve body against the first communication portion;
A ball body accommodated in the hollow valve body in a state in which the lower vent hole of the hollow valve body is allowed to move from a position of closing the hollow valve body from the inside to a position where it is not closed. The integrated valve for a fuel tank according to claim 1, 2 or 3, wherein: An upper space communicating with the air passage to the canister,
A lower chamber arranged in the fuel tank,
An intermediate room provided between the upper space and the lower room,
A first communication part for communicating the upper space with the intermediate chamber,
A second communication portion for communicating the intermediate chamber and the lower chamber,
A third communication portion that communicates the upper space and the lower chamber without interposing the intermediate chamber,
A float that constitutes a cut valve housed in the lower chamber so as to rise by the inflow of fuel into the lower chamber and close the second communication portion from the lower chamber side;
A float that constitutes a vent valve housed in the lower chamber so as to rise by the inflow of fuel into the lower chamber and close the third communication part from the lower chamber side;
A check valve structure that is housed in the intermediate chamber and opens the valve when the fuel tank reaches a certain high pressure state or a certain low pressure state to communicate the lower chamber and the upper space via the intermediate chamber. Along with
At the stage where the liquid level of the fuel in the fuel tank reaches a liquid level higher than or equal to the level at which the float level of the fuel in the fuel tank rises to a position at which the third communication portion is closed, It is configured to be raised to a position to close the two communication part,
Moreover, it has an upper case body, a first lower case body, a second lower case body, a first stopper, and a second stopper,
At the bottom of the upper case body,
A first lower opening portion to which one of the first lower case body and the first plug body is fitted,
A second lower opening portion to which one of the second lower case body and the second plug body is fitted,
The upper space is formed by fitting one of the first lower case body and the first plug body to the upper case body, and fitting one of the second lower case body and the second plug body to the upper case body. As well as
The first lower case body forms a lower chamber for housing the float body constituting the vent valve,
An integrated valve for a fuel tank, wherein the intermediate chamber and a lower chamber for accommodating a float constituting a cut valve are formed by a second lower case body. The third communication portion is constituted by a large-diameter communication hole and a small-diameter communication hole smaller than the large-diameter communication hole,
A main float contained in the lower chamber such that a float body constituting the vent valve rises due to the inflow of fuel into the lower chamber and closes the large-diameter communication hole from the lower chamber side;
A sub-float accommodated in the lower chamber so as to rise by the inflow of fuel into the lower chamber and close the small-diameter communication hole from the lower chamber side,
The sub-float is raised to a position where the small diameter communication hole is closed when the liquid level of the fuel in the fuel tank reaches a liquid level higher than or equal to a level at which the main float is raised to a position where the large diameter communication hole is closed. It is configured as
6. The integrated valve for a fuel tank according to claim 5, wherein the first lower case body forms a lower chamber for accommodating the main float and the sub float constituting the vent valve. A fourth communication portion that communicates the upper space with the lower chamber or the fuel tank without interposing the intermediate chamber is provided,
A relief valve structure for opening the valve when the fourth communication portion is in a constant high pressure state in the fuel tank and for communicating the lower chamber or the inside of the fuel tank with the upper space via the fourth communication portion; 7. The integrated valve for a fuel tank according to claim 5, wherein the valve is closed by: Check valve structure,
A hollow valve body that is housed in the intermediate chamber so as to be able to move up and down and has ventilation holes at its upper and lower parts,
Biasing means for constantly biasing the hollow valve body upward with a predetermined force to press the upper portion of the hollow valve body against the first communication portion;
A ball body accommodated in the hollow valve body in a state in which the lower vent hole of the hollow valve body is allowed to move from a position of closing the hollow valve body from the inside to a position where it is not closed. The integrated valve for a fuel tank according to claim 5, 6 or 7, wherein:

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