JP2011122586A - Evaporated fuel treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain a fueling-stopped state of a fueling nozzle 80 to arrest additional fueling by maintaining the internal space pressure of a fuel tank 10 just after completion of fueling. <P>SOLUTION: The device includes a ventilation control valve disposed at a portion between a leak prevention valve and a canister in the middle of a ventilation passage to switch communication and interruption of the ventilation passage. The ventilation control valve allows the communication of the ventilation passage when the flow velocity of air flow flowing through the ventilation passage from the internal space to the canister is lower than a predetermined value and interrupts the ventilation passage when it exceeds the predetermined value. Accordingly, a valve element is moved by fluid pressure, when the flow velocity of the air flow is momentarily increased by water hammering by automatic stop of fueling of the fueling nozzle, to interrupt the ventilation control valve, and the internal pressure of the fuel tank is maintained at the pressure in stoppage of fueling, whereby the fueling-stopped state of the fueling nozzle is maintained to arrest the additional fueling. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an evaporative fuel processing apparatus that collects fuel vapor generated inside a fuel tank and controls fuel vapor pressure in the fuel tank.

  The pressure of the fuel tank of an automobile, that is, the pressure in the internal space of the fuel tank varies depending on various factors. For example, as the fuel is consumed by the engine and the amount of fuel in the fuel tank decreases, the pressure in the internal space of the fuel tank decreases. When the temperature of the fuel tank rises, vaporization of the fuel in the fuel tank becomes active and the vapor pressure increases. Since fluctuations in the pressure inside the fuel tank affect the deformation of the fuel tank, the pressure inside the fuel tank must always be maintained at a constant pressure, for example, atmospheric pressure. Is to achieve.

  2. Description of the Related Art As a conventional evaporative fuel processing apparatus, there is one provided with a ventilation passage that communicates a substance that absorbs fuel vapor, for example, a canister containing activated carbon, and an internal space of a fuel tank (see, for example, Patent Document 1).

  In the conventional evaporative fuel processing apparatus described above, when the fuel vapor pressure in the fuel tank becomes higher than the atmospheric pressure, the fuel vapor reaches the canister through the ventilation passage, is absorbed by the activated carbon in the canister, and only air is outside the canister. The pressure inside the fuel tank is maintained at almost atmospheric pressure. On the other hand, when the fuel is consumed by the engine and the pressure in the fuel tank becomes lower than the atmospheric pressure, air flows into the canister from the opening of the canister and is introduced into the fuel tank through the ventilation passage. Maintained at atmospheric pressure. Further, in the conventional fuel vapor processing apparatus, a fuel leakage prevention valve is provided at the end of the ventilation passage on the fuel tank side, that is, near the ceiling plate of the fuel tank. The fuel leak prevention valve communicates with the ventilation passage during normal operation of the automobile, but if the attitude angle of the automobile exceeds the angle range that can occur during normal operation, the fuel level in the fuel tank tilts and the fuel prevention valve is immersed in fuel. The fuel leakage prevention valve blocks the ventilation passage. As a result, the fuel is prevented from flowing from the fuel tank to the canister via the ventilation passage and further to the outside.

JP 2000-203282 A

  A fuel tank of an automobile includes a fuel filler pipe into which a fuel gun is inserted during refueling, and further includes a breather pipe for allowing the air in the fuel tank to flow out. One end of the breather pipe opens near the full tank level in the fuel tank, and the other end opens near the tip of the fuel gun inside the fuel filler pipe. When the fuel flows into the fuel tank during refueling, the air in the fuel tank is replaced and discharged from the breather pipe to the outside through the fuel filler pipe. Eventually, when the fuel fills up and the fuel tank side opening of the breather pipe is immersed in the fuel, the pressure in the fuel tank temporarily rises, the fuel flows into the breather pipe, reaches the fuel filler pipe, and the tip of the fuel gun The part is immersed in fuel. The refueling gun is provided with a detection unit that detects that the fuel gun has been immersed in fuel, and a mechanism that stops refueling when it is detected that the detection unit has been immersed in fuel. Even when the fueling lever is pulled, the fueling is automatically stopped when the tip of the fueling gun is immersed in the fuel. As a result, the fuel tank is prevented from overflowing to the outside due to the supercharged state.

  By the way, the air in the fuel tank during refueling is mainly discharged from the breather pipe to the outside, but the path consisting of the fuel leakage prevention valve, the ventilation passage, and the canister is also communicated to the outside (in the atmosphere). The air in the air flows out of this route even though it is very small. For this reason, after the tip of the refueling gun is immersed in the fuel and the refueling is automatically stopped, the air flows out to the outside through the path consisting of the fuel leakage prevention valve-ventilation passage-canister, and the pressure in the fuel tank is increased. The fuel in the breather pipe and the fuel filler pipe returns to the fuel tank, and the fuel disappears from around the tip of the fuel gun. Then, the fuel gun returns to a state where it can be refueled, and further refueling becomes possible. Therefore, there is a risk that fuel of a specified amount or more will be refueled to the fuel tank.

  The present invention has been made against the background described above, and its object is to maintain the fuel in the breather pipe and the fuel filler pipe after the automatic refueling mechanism is activated when fuel is supplied to the fuel tank. An object of the present invention is to provide a fuel vapor processing apparatus capable of maintaining the operation of an automatic stop mechanism.

  According to a first aspect of the present invention, there is provided a fuel vapor processing apparatus according to the first aspect of the present invention, wherein the fuel tank has an air passage that communicates the internal space of the fuel tank and the canister, and is disposed in the middle of the air passage. An evaporative fuel treatment device comprising: a leakage prevention valve that shuts off the fuel passage when changed beyond a limit; and disposed in a portion of the ventilation passage and between the leakage prevention valve and the canister. The ventilation control valve is equipped with a ventilation control valve that switches between communication and shut-off. The ventilation control valve communicates with the ventilation passage when the flow velocity of the air flowing through the ventilation passage from the internal space toward the canister is lower than a predetermined value. It is characterized by blocking.

  The operation of each part at the time of fuel supply to the fuel tank in the evaporative fuel processing apparatus configured as described above will be described.

  When a fuel gun is inserted into the fuel filler pipe of the fuel tank and fueling is started, fuel flows into the fuel tank. Correspondingly, the air in the fuel tank reaches the canister from the leakage prevention valve through the ventilation passage, the fuel vapor in the air is absorbed by the activated carbon of the canister, and only the air is released to the outside from the opening of the canister. . Part of the air in the fuel tank reaches the mouth of the fuel filler pipe via the breather pipe. The ventilation passage that communicates the internal space of the fuel tank with the outside has a small flow path cross-sectional area.Therefore, the pressure in the fuel tank is maintained during refueling, that is, while the fuel is flowing from the fuel gun into the fuel tank. It is slightly higher than atmospheric pressure. Eventually, when the fuel reaches the lower end of the breather pipe and the ventilation from the breather pipe is blocked, the fuel reaches the mouth of the fuel filler pipe, and the fuel closes the air hole at the end of the fuel supply gun. As a result, the refueling operation of the fuel gun is automatically stopped, and the fuel inflow into the fuel tank is stopped.

  The same is true up to this point when refueling a fuel tank of a conventional evaporative fuel processing apparatus. However, the conventional fuel vapor processing apparatus does not have the ventilation control valve provided in the fuel vapor processing apparatus according to claim 1 of the present invention. For this reason, even after the refueling operation of the fuel gun is automatically stopped, the air in the fuel tank flows out from the leakage prevention valve through the vent passage and the canister, and the pressure in the fuel tank is reduced to atmospheric pressure. If it does so, the fuel in a fuel filler pipe will return in a fuel tank, the air hole of the cylinder tip of a fueling gun will be open | released, and a fueling gun will switch to a state which can be fueled. For this reason, if the refueling operator pulls the lever of the refueling gun, additional refueling becomes possible, and there is a possibility that fuel of a specified amount or more will be refueled into the fuel tank.

  Therefore, the evaporative fuel processing apparatus according to claim 1 of the present invention is provided with a ventilation control valve, and after the fueling operation of the fuel gun is automatically stopped, the ventilation control valve is shut off and the pressure in the fuel tank is higher than the atmospheric pressure. The fuel level in the fuel filler pipe is maintained, the air hole at the tip of the fuel gun is closed by the fuel, and the fuel gun is stopped. Is deterred from being refueled.

  The operation of the ventilation control valve, which is a characteristic configuration of the fuel vapor processing apparatus according to claim 1 of the present invention, will be described. The air flow control valve communicates the air passage when the flow velocity of the air flow flowing through the air passage from the fuel tank inner space toward the canister is lower than a predetermined value, and the air flow flowing through the air passage from the fuel tank inner space toward the canister is reduced. The air passage is set to be shut off when the flow rate exceeds a predetermined value. Here, the predetermined flow rate of the air flow is a flow rate of the air flow that can be generated in the ventilation passage during normal refueling, and the air flow control valve is opened when the air flow of such a flow rate is generated. ing. When the fuel level in the fuel tank reaches the full tank position and the refueling of the fuel gun automatically stops, the flow of fuel into the fuel tank stops at a stretch.Therefore, the flow velocity of the air flow that flows from the fuel tank internal space toward the canister Will rise for a moment due to the water hammer effect. The ventilation control valve is switched to the shut-off state by the action of the flow velocity that has increased momentarily in this way, specifically by the action of increasing the momentum of the air flow. As a result, the communication between the fuel tank internal space and the outside is cut off, and the pressure in the fuel tank is maintained at the pressure at the time of refueling stop of the fuel gun, in other words, higher than the atmospheric pressure. Accordingly, the fuel level in the fuel filler pipe is maintained, the air hole at the tip of the fuel gun is blocked by the fuel, and the fuel supply stop state of the fuel gun is maintained, so that more fuel than the specified amount is supplied to the fuel tank. Can be suppressed.

  According to a second aspect of the present invention, there is provided an evaporative fuel processing apparatus comprising: a second ventilation passage that communicates an internal space and a canister; or that communicates a portion of the internal space and the ventilation passage between a leakage cutoff valve and the canister. A full control valve that is arranged in the middle of the second ventilation passage and normally communicates with the second ventilation passage and shuts off the second ventilation passage when the amount of fuel in the fuel tank reaches a predetermined amount when the fuel tank is refueled It is characterized by having.

  In the conventional evaporative fuel processing system, the fuel tank side of the passage communicating the fuel tank and the canister has a fuel tank side where the amount of fuel in the fuel tank reaches a predetermined amount, in other words, a full tank control that shuts off the passage when the tank is full. Some have a valve. The full tank control valve cuts off the communication between the internal space of the fuel tank and the canister when the fuel amount in the fuel tank reaches the full tank amount, and prevents the fuel from reaching the canister through the passage and adhering to the activated carbon. The pressure inside the fuel tank is raised, so that the fuel discharged from the fuel gun stays in the fuel filler pipe and the air hole at the tip of the fuel gun is closed with fuel to activate the automatic fuel stop function. is there. Even in the fuel vapor processing apparatus having such a structure, the path including the leakage prevention valve, the ventilation path, and the canister communicates with the atmosphere, and the air in the fuel tank leaks even after the fueling operation of the fuel gun is automatically stopped. There is a possibility that the fuel flows out from the prevention valve through the ventilation passage and the canister, the fuel in the fuel filler pipe flows into the fuel tank, the air hole of the fuel gun is opened, and the fuel can be supplied again.

  Therefore, according to the evaporated fuel processing apparatus of the second aspect of the present invention, even in the evaporated fuel processing apparatus provided with the full tank control valve, the ventilation control valve is shut off after the fuel supply operation of the fuel gun is automatically stopped. Maintain the fuel tank pressure higher than the atmospheric pressure, maintain the fuel level in the fuel filler pipe, close the air hole at the tip of the fuel gun with the fuel, and maintain the fuel supply stop state of the fuel gun As a result, it is possible to prevent the fuel tank from being supplied with fuel of a specified amount or more.

  The fuel vapor processing apparatus according to claim 3 of the present invention is characterized in that the aeration control valve switches from the shut-off state to the communication state when vibration is transmitted from the outside.

  When refueling the fuel tank, the fuel tank is full and the ventilation shutoff valve is shut off, maintaining the pressure inside the fuel tank and preventing the fuel tank from being filled with fuel above the specified amount. However, the fuel tank evaporative gas does not reach the canister if the refueling is completed and the engine is started again. To rise.

  Therefore, with the configuration of the evaporative fuel processing device according to claim 3 of the present invention, when vibration at engine start is transmitted to the aeration control valve through the evaporative fuel processing device, the aeration control valve is switched to the communication state. . As a result, after the refueling operation of the refueling gun is automatically stopped, the refueling gun is maintained in the refueling stop state, and the supercharging to the fuel tank is surely suppressed, and the refueling is completed and the engine is started again. The control valve is switched from the shut-off state to the communication state, and the pressure in the fuel tank can always be maintained at atmospheric pressure.

  The evaporative fuel processing apparatus according to claim 4 of the present invention is characterized in that the ventilation control valve is formed integrally with the leakage prevention valve.

  According to the above-described configuration, after the fueling operation of the fueling gun is automatically stopped, the fueling state of the fueling gun is maintained, and the supercharging to the fuel tank is surely suppressed, and the number of components of the evaporative fuel processing device is reduced. As a result, the number of steps for assembling the evaporative fuel treatment device can be reduced.

  The fuel vapor processing apparatus according to claim 5 of the present invention is characterized in that the aeration control valve is formed integrally with the full tank control valve.

  According to the above-described configuration, after the fueling operation of the fueling gun is automatically stopped, the fueling state of the fueling gun is maintained, and the supercharging to the fuel tank is surely suppressed, and the number of components of the evaporative fuel processing device is reduced. As a result, the number of steps for assembling the evaporative fuel treatment device can be reduced.

  According to a sixth aspect of the present invention, there is provided the evaporative fuel processing apparatus, wherein the vent control valve is a valve seat formed at the periphery of the vent passage, and an action of a fluid force of an air flow flowing through the vent passage from the internal space toward the canister. The valve body is movably disposed by the valve body, the ventilation passage is blocked when the valve body is seated on the valve seat, and the ventilation passage is communicated when the valve body is separated from the valve seat. It is characterized by comprising bypass means for maintaining communication between the internal space and the canister even when seated on the valve seat.

  According to the above-described configuration, even if a situation occurs in which the ventilation control valve remains shut off for some reason even though the engine is started and vibration is transmitted, the internal space of the fuel tank and the canister can be connected via the bypass means. Can communicate with each other. Thereby, when refueling is completed and the engine is started again, the pressure in the fuel tank can be reliably maintained at atmospheric pressure.

  In this case, if the bypass means is configured as a through hole provided in the valve body as in the evaporative fuel processing apparatus according to claim 7 of the present invention, the bypass means can be easily and reliably formed.

  In the fuel vapor processing apparatus according to claim 8 of the present invention, the ventilation passage is divided into the internal space side and the canister side with the ventilation control valve interposed therebetween, thereby forming the internal space side passage and the canister side passage. The bypass means includes a throttle passage that is provided in the ventilation control valve and throttles an air flow between the inner space side passage and the canister side passage, and the throttle passage is formed in the inner space when the valve body is seated on the valve seat. The side passage and the canister side passage communicate with each other.

  According to the above-described configuration, in the state where the ventilation passage is blocked by the seating of the valve body on the valve seat, the passage between the inner space side passage and the canister side passage in the ventilation passage serves as a bypass control valve. It can communicate by passing through the throttle passage provided. Here, since the air flow between the internal space side passage and the canister side passage is restricted by the restriction passage, the pressure in the fuel tank is large on the canister side after the ventilation passage is shut off due to the automatic stop of the fuel supply operation of the fuel gun. It will drop slowly from a pressure higher than atmospheric pressure. Therefore, immediately after the ventilation passage is shut off, not only is the fuel tank internal pressure maintained higher than the atmospheric pressure to suppress supercharging to the fuel tank, but also when the time has elapsed since the shutoff, the fuel tank internal pressure is reduced. By returning to atmospheric pressure, the deformation of the fuel tank can be suppressed.

  According to a ninth aspect of the present invention, the evaporative fuel processing device further includes a valve chamber in which the ventilation control valve communicates with the internal space side passage and accommodates the valve body, and the valve seat is the valve chamber of the canister side passage. The bypass means is provided by a through hole provided in the valve body and opened at both ends toward the valve chamber and the opening of the canister side passage when the valve body is seated on the valve seat. It is characterized by forming a passage.

  According to the above-described configuration, when the valve body is seated on the valve seat, both end portions of the through hole provided in the valve body open toward the valve chamber and the opening of the canister side passage, thereby forming the through hole. The throttle passage can reliably connect the internal space side passage communicating with the valve chamber to the canister side passage. Therefore, when the valve body is seated on the valve seat as the fuel supply operation is automatically stopped, the pressure inside the fuel tank, which is higher than the atmospheric pressure, is reduced even when the ventilation passage is blocked, and the fuel tank is deformed. Can be suppressed.

  According to a tenth aspect of the present invention, the evaporative fuel processing device further includes a valve chamber in which the ventilation control valve communicates with the internal space side passage and accommodates the valve body, and the valve seat is a valve in the canister side passage. Provided at the periphery of the opening facing the chamber, the bypass means is provided in the valve seat by a recessed groove whose both ends open toward the valve chamber and the opening of the canister side passage when seated on the valve seat, It is characterized by forming a throttle passage.

  According to the above configuration, when the valve body is seated on the valve seat, both end portions of the concave groove provided in the valve seat open toward the valve chamber and the opening of the canister side passage, thereby forming the concave groove. The throttle passage can reliably connect the internal space side passage communicating with the valve chamber to the canister side passage. Therefore, when the valve body is seated on the valve seat as the fuel supply operation is automatically stopped, the pressure inside the fuel tank, which is higher than the atmospheric pressure, is reduced even when the ventilation passage is blocked, and the fuel tank is deformed. Can be suppressed.

  In the fuel vapor processing apparatus according to claim 11 of the present invention, the ventilation control valve further includes a communication passage provided in the valve body with a flow passage cross-sectional area larger than the throttle passage, and the communication passage is a valve of the valve body. The ventilation passage is communicated between the internal space side passage and the canister side passage when the seat is separated from the seat, and is blocked between the internal space side passage and the canister side passage when the valve body is seated on the valve seat. It has features.

  According to the above-described configuration, the communication passage provided in the valve body in the ventilation control valve communicates with the ventilation passage by separating the valve body from the valve seat between the internal space side passage and the canister side passage. It becomes. In this communication state, the air flow between the internal space side passage and the canister side passage can mainly pass through the communication passage having a larger flow path cross-sectional area than the throttle passage. Therefore, at the time of engine operation or the like in which the ventilation passage is in communication, an amount of air or fuel vapor corresponding to the fluctuation in the pressure in the fuel tank flows smoothly in the ventilation passage to suppress deformation of the fuel tank. be able to. On the other hand, between the internal space side passage and the canister side passage, the communication passage is blocked by the seating of the valve body on the valve seat accompanying the automatic stop of the refueling operation, so that the ventilation passage is blocked, but the throttle passage The pressure inside the fuel tank can be reduced by this, so that the deformation suppressing effect of the fuel tank is not hindered.

  In the fuel vapor processing apparatus according to the twelfth aspect of the present invention, the ventilation control valve further includes urging means for urging in the direction away from the valve seat, and the valve body is located on the canister side from the internal space side passage. It is characterized by being seated on the valve seat against the urging force of the urging means when the fluid force of the air flow toward the passage acts and the pressure in the fuel tank received through the internal space side passage rises. .

  According to the above-described configuration, the valve body biased in the direction away from the valve seat in the ventilation control valve has a fluid force of the air flow from the internal space side passage toward the canister side passage accompanying the automatic stop of the refueling operation. By acting, it sits on the valve seat against the bias. As a result, when the ventilation passage is blocked, the pressure in the fuel tank becomes higher than the atmospheric pressure, so that the valve body that receives the pressure in the fuel tank can continue to be seated on the valve seat. After that, when the pressure in the fuel tank decreases through the throttle passage, the valve body is separated from the valve seat by the urging means, so that the ventilation passage communicates and the fuel tank pressure is surely set to the atmospheric pressure. Become. As described above, immediately after the ventilation passage is shut off, not only is the fuel tank internal pressure maintained higher than the atmospheric pressure to suppress supercharging to the fuel tank, but also when the time has elapsed since the shut-off, the fuel tank internal pressure Can be returned to atmospheric pressure to suppress deformation of the fuel tank.

  The fuel vapor processing apparatus according to claim 13 of the present invention is characterized in that the urging means includes an elastic member that generates, by elastic deformation, a restoring force that urges the valve body in the direction away from the valve seat. It is said.

  According to the above configuration, when the pressure in the fuel tank decreases through the throttle passage after the ventilation passage is shut off due to the automatic stop of the refueling operation, the valve body biased by the restoring force of the elastic member that is elastically deformed is reliably You can sit away. Thus, by utilizing the restoring force of the elastic member, the deformation suppression effect of the fuel tank can be stably obtained.

  The evaporative fuel processing apparatus according to claim 14 of the present invention is characterized in that the urging means urges the valve body in the direction away from the valve seat by its own weight.

  According to the above configuration, when the pressure in the fuel tank decreases through the throttle passage after the ventilation passage is shut off due to the automatic stop of the refueling operation, the valve body is urged by its own weight and easily separated from the valve seat. obtain. By utilizing the gravity action on the valve body in this way, the effect of suppressing deformation of the fuel tank can be obtained even with a relatively simple configuration.

It is a schematic diagram which shows the state which attached the fuel vapor processing apparatus by 1st Embodiment of this invention to the fuel tank, and has shown the fuel tank full state. It is sectional drawing which shows the structure of the ventilation | gas_flowing control valve of the evaporative fuel processing apparatus by 1st Embodiment of this invention, and has shown the interruption | blocking state (a broken line has shown the communication state). FIG. 3 is a view taken along arrow III in FIG. 2. It is a schematic diagram which shows the state which attached the fuel vapor processing apparatus by 2nd Embodiment of this invention to the fuel tank. It is a schematic diagram which shows the state which attached the modification of the evaporative fuel processing apparatus by 2nd Embodiment of this invention to the fuel tank. It is a schematic diagram which shows the state which attached the evaporative fuel processing apparatus by 3rd Embodiment of this invention to the fuel tank. It is sectional drawing which shows the structure of the leak prevention valve of the evaporative fuel processing apparatus by 3rd Embodiment of this invention, and a ventilation control valve. It is a schematic diagram which shows the state which attached the fuel vapor processing apparatus by 4th Embodiment of this invention to the fuel tank. It is sectional drawing which shows the structure of the full tank control valve and ventilation control valve of the evaporative fuel processing apparatus by 4th Embodiment of this invention. It is a schematic diagram which shows the state which attached the fuel vapor processing apparatus by 5th Embodiment of this invention to the fuel tank, and has shown the fuel tank full state. It is sectional drawing which shows the structure of the ventilation | gas_flowing control valve of the evaporative fuel processing apparatus by 5th Embodiment of this invention, and has shown the interruption | blocking state. It is sectional drawing which shows the structure of the ventilation | gas_flowing control valve of the evaporative fuel processing apparatus by 5th Embodiment of this invention, and has shown the communication state. It is a schematic diagram which shows the state which attached the evaporative fuel processing apparatus by 6th Embodiment of this invention to the fuel tank, and has shown the full tank state of the fuel tank. It is sectional drawing which shows the structure of the ventilation | gas_flowing control valve of the evaporative fuel processing apparatus by 6th Embodiment of this invention, The right half shows the interruption | blocking state and the left half has shown the communication state. It is sectional drawing which shows the structure of the ventilation | gas_flowing control valve of the evaporative fuel processing apparatus by 7th Embodiment of this invention, The right half shows the interruption | blocking state and the left half has shown the communication state. It is sectional drawing which shows the structure of the ventilation | gas_flowing control valve of the evaporative fuel processing apparatus by 8th Embodiment of this invention, and has shown the interruption | blocking state. It is sectional drawing which shows the structure of the ventilation | gas_flowing control valve of the evaporative fuel processing apparatus by 8th Embodiment of this invention, and has shown the communication state. It is sectional drawing which shows the structure of the modification of the ventilation control valve by 1st-4th embodiment of this invention. It is sectional drawing which shows the structure of the modification of the ventilation control valve by 5th Embodiment of this invention, and is a figure corresponding to FIG.

  Hereinafter, a plurality of embodiments of an evaporative fuel processing apparatus according to the present invention will be described with reference to the drawings, taking as an example a case where the evaporative fuel processing apparatus 1 is attached to a fuel tank 10 of an automobile. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .

(First embodiment)
FIG. 1 is a schematic diagram for explaining a piping system of a vent pipe 30 extending from a fuel tank 10 of an automobile to a canister 40 to which an evaporated fuel processing apparatus 1 according to a first embodiment of the present invention is applied. The fuel tank 10 includes a fuel filler pipe 11 and a breather pipe 12 for supplying fuel. During refueling, the nozzle of the refueling gun 80 is inserted into the fuel tank 10 outside opening of the fuel filler pipe 11 as shown in FIG. 1, and fuel is replenished into the fuel tank 10. The breather pipe 12 is arranged with one end opened in the fuel tank 10 and the other end opened near the fuel gun 80 side opening of the fuel filler pipe 11, and the maximum amount of fuel in the fuel tank 10 is defined at the time of fueling. That is, when the tank is full, the fuel in the fuel tank 10 is guided to the air hole 81 near the nozzle tip of the fuel gun 80. When the air hole 81 of the fueling gun 80 is closed with fuel, the fueling gun 80 automatically stops fueling. That is, even if the lever 82 of the fuel gun 80 is pulled by the fuel operator, the fuel outflow stops.

  The fuel tank 10 is a ventilation passage that communicates the internal space, that is, the space surrounded by the fuel liquid level and the wall surface of the fuel tank 10 where air and fuel vapor are present, and the canister 40. A vent pipe 30 is connected. As shown in FIG. 1, a leakage prevention valve 20 is connected in series to the end of the vent pipe 30 on the fuel tank 10 side. The leakage prevention valve 20 switches from the communication state to the shut-off state when the attitude of the fuel tank 10 changes beyond the limit, that is, when the inclination of the fuel tank 10 exceeds an inclination angle range that can occur during normal vehicle travel. . The leakage prevention valve 20 includes, for example, a float valve 21 formed so as to float in the fuel and a valve seat (not shown) formed on the opening periphery of the vent pipe 30. Since the leakage prevention valve 20 is not immersed in the fuel at normal times, the float valve 21 is away from the valve seat, and the vent pipe 30 communicates the internal space of the fuel tank 10 with the canister 40. . When the vehicle becomes steep due to an accident or the like, the fuel level in the fuel tank 10 tilts and the leakage prevention valve 20 is immersed in the fuel, the float valve 21 moves by the action of buoyancy and comes into contact with the valve seat. Therefore, the communication between the internal space of the fuel tank 10 and the canister 40 is blocked. As a result, the fuel in the fuel tank 10 is reliably prevented from flowing out to the canister 40 via the vent pipe 30.

  The canister 40 is formed by airtightly containing, for example, activated carbon 44 as a filter having a function of adsorbing and collecting fuel vapor in a casing 41 formed of a metal or a resin material. The canister 40 includes a ventilation port 42 and an atmospheric port 43 with the activated carbon 44 interposed therebetween. The ventilation port 42 is connected to the ventilation pipe 30 and communicates with the internal space of the fuel tank 10 via the ventilation pipe 30. The atmospheric port 43 is open to the atmosphere. When the fuel gun 80 is inserted into the fuel filler pipe 11 of the fuel tank 10 and fueling is started, the fuel flows into the fuel tank 10. Correspondingly, the air in the fuel tank 10 reaches the canister 40 from the leakage prevention valve 20 through the vent pipe 30, the fuel vapor in the air is absorbed by the activated carbon 44 of the canister 40, and only the air is in the canister 40. Released from the atmospheric port 43 to the outside. Part of the air in the fuel tank 10 reaches the mouth of the fuel filler pipe 11 via the breather pipe 12. The vent pipe 30 that communicates the internal space in the fuel tank 10 with the outside has a small flow passage cross-sectional area, so that the fuel tank is being refueled, that is, while fuel is flowing into the fuel tank 10 from the fuel gun 80. The pressure in 10 is slightly higher than atmospheric pressure. Eventually, when the fuel reaches the lower end of the breather pipe and the ventilation from the breather pipe is interrupted, the fuel reaches the mouth of the fuel filler pipe 11 and the fuel closes the air hole 81 at the tip of the fuel supply gun 80. As a result, the refueling operation of the fuel gun 80 is automatically stopped, and the fuel inflow into the fuel tank is stopped.

  As shown in FIG. 1, a ventilation control valve 50 is disposed in the middle of the ventilation pipe 30. That is, the ventilation control valve 50 forms a part of the ventilation pipe 30. The structure and operation of the ventilation control valve 50 will be described below.

  As shown in FIG. 2, the ventilation control valve 50 includes a casing 51 including a passage 51 a forming a part of the ventilation pipe 30 and a valve chamber 51 b formed so as to bisect the passage 51 a in the middle of the passage 51 a, and the casing 51. The valve body 52 is housed and held in the valve chamber 51b. The casing 51 is made of, for example, a resin material or a metal material. In a valve chamber 51b of the casing 51, a bearing portion 51d for fitting with a shaft portion 52b of a valve body 52, which will be described later, for holding the valve body 52 so as to be rotatable around the shaft portion 52b, And a stopper 51e for restricting the rotational angle position of the valve body 52. A valve seat 51c that closes the valve portion 52a of the valve body 52 and blocks the passage 51a is formed at the peripheral edge of the opening facing the valve chamber 51b of one of the passages 51a divided into two by the valve chamber 51b. Has been.

  The valve body 52 is made of, for example, a resin material or a metal material. As shown in FIG. 3, the valve body 52 has a valve portion 52a, a shaft portion 52b, and a valve portion 52a that are in close contact with the valve seat 51c of the casing 51. A through hole 52c is formed so that the passage 51a on the valve seat 51c side and the valve chamber 51b communicate with each other in close contact.

  Next, the operation of the ventilation control valve 50, that is, the role of the ventilation control valve 50 in the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention will be described.

  In the state where the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention is mounted on an automobile, the aeration control valve 50 has the left side in FIG. 2 as the fuel tank 10 side and the right side in FIG. 2 as the canister 40 side. In the middle of the vent pipe 30. Further, the ventilation control valve 50 is substantially horizontal when mounted on the automobile. In the state in which the ventilation control valve 50 is mounted on an automobile, the valve body 52 has a lower end shaft portion 52b fitted with the bearing portion 51d. Therefore, the valve portion 52a of the valve body 52 as shown in FIG. However, the posture in close contact with the valve seat 51c is unstable, and it is difficult to maintain the posture. When some external force is applied to the ventilation control valve 50, for example, when vibrations during engine operation are transmitted or vibrations caused by running of an automobile are transmitted, the valve body 52 easily rotates around the shaft portion 52b. 2 is a position that is in contact with the stopper 51e and indicated by a broken line in FIG. 2, that is, a position where the valve portion 52a of the valve body 52 is separated from the valve seat 51c and opens the passage 51a. Even after the valve body 52 is in the position indicated by the broken line in FIG. 2, when the vibration of the engine or the vibration of the automobile is transmitted to the ventilation control valve 50, the valve body 52 is placed around the shaft portion 52b with the stopper 51e and the valve seat. Although the valve body 52 rotates within an angular range with respect to the valve seat 51c, the valve body 52 is separated immediately even if it contacts the valve seat 51c. Therefore, the ventilation control valve 50 is always in a communicating state while the engine is operated and the automobile is running. It has become. Therefore, the ventilation control valve 50 is in communication even when the automobile goes to the filling station for refueling and stops the engine.

  Next, the operation of the evaporated fuel processing apparatus 1 when refueling the fuel tank 10 of the automobile on which the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention is mounted will be described.

  As shown in FIG. 1, when the fueling gun 80 is inserted into the fuel filler pipe 11 of the fuel tank 10 and fueling is started, the fuel flows into the fuel tank 10. Correspondingly, the air in the fuel tank 10 passes from the leakage prevention valve 20 through the ventilation pipe 30 to the canister 40 through the ventilation control valve 50 and the fuel vapor in the air is activated carbon 44 of the canister 40. And only air is discharged from the atmospheric port 43 of the canister 40 to the outside. Part of the air in the fuel tank 10 reaches the mouth of the fuel filler pipe 11 via the breather pipe 12. The vent pipe 30 that communicates the internal space in the fuel tank 10 and the canister 40 has a small cross-sectional area of the flow path, so that the amount of outflow air per unit time is smaller than the amount of inflow fuel per unit time, and during refueling, that is, While the fuel flows from the fuel gun 80 into the fuel tank 10, the pressure in the fuel tank 10 is slightly higher than the pressure outside the atmospheric port 43 of the canister 40, that is, the atmospheric pressure. Since the flow rate of fuel flowing out of the fuel gun 80 is constant, the flow rate of air passing through the ventilation control valve 50 is also correspondingly constant, and the speed of the air flow passing through the valve chamber 51b of the ventilation control valve 50 is also constant. It is. A fluid force acts on the valve portion 52a of the valve body 52 by this air flow. In response to the fluid force acting on the valve portion 52a, a clockwise torque in FIG. 2 acts on the valve body 52 around the shaft portion 52b. However, this torque is not large enough to actually rotate the valve body 52 and bring it into contact with the valve seat 51c. The velocity of the air flow passing through the valve chamber 51b at this time is the “speed of the air flow is lower than a predetermined value” according to claim 1. Eventually, when the fuel reaches the lower end of the breather pipe and the ventilation from the breather pipe is interrupted, the fuel reaches the mouth of the fuel filler pipe 11 and the fuel closes the air hole 81 at the tip of the fuel supply gun 80. As a result, the refueling operation of the refueling gun 80 is automatically stopped, and the fuel inflow into the fuel tank 10 is stopped. The automatic refueling stop of the fuel gun 80 at this time is such that the fuel discharge from the fuel gun 80 stops abruptly. For this reason, the flow velocity of the airflow flowing in the ventilation pipe 30 from the internal space of the fuel tank 10 toward the canister 40 is increased momentarily by the water hammer action, and the flow velocity of the air in the valve chamber 51b of the ventilation control valve 50 is also instantaneously changed. Increase. The velocity of the air flow passing through the valve chamber 51b at this time is the “speed of the air flow exceeds a predetermined value” according to claim 1. The torque acting on the valve body 52 when the valve portion 52a receives this momentarily increased air flow, that is, the clockwise torque in FIG. 2 about the shaft portion 52b is sufficient to rotate the valve body 52. There is a size, whereby the valve body 52 is rotated, the valve portion 52a is brought into close contact with the valve seat 51c, and the ventilation control valve 50 is shut off. That is, the communication between the internal space of the fuel tank 10 and the canister 40 is blocked. Since the engine is stopped during refueling, no external force acts on the ventilation control valve 50, and the valve body 52 is maintained in close contact with the valve seat 51c.

  The shape of the valve chamber 51b of the ventilation control valve 50, in other words, the flow velocity of the air flow in the valve chamber 51b and the shape and weight of the valve body 52 are set so that the above-described operation is possible.

  When the communication between the internal space of the fuel tank 10 and the canister 40 is interrupted, the pressure in the fuel tank 10 immediately before the automatic refueling, that is, the pressure when the fuel flows into the fuel tank 10 is maintained. Since the fuel in the filler pipe 11 is held as it is, the air hole at the end of the cylinder of the refueling gun 80 remains blocked by the fuel. As a result, the refueling gun 80 is in a state where the refueling stop state is maintained and the refueling operator cannot perform additional refueling.

  Subsequently, when refueling is completed and the engine is started, vibrations of the engine are transmitted to the ventilation control valve 50 via the vehicle body. Then, the valve body 52 immediately rotates and assumes a posture in contact with the stopper 51e. As a result, the ventilation control valve 50 enters a communication state, and the internal space in the fuel tank 10 communicates with the canister 40. As a result, when the amount of fuel in the fuel tank 10 is reduced by being consumed by the engine, the reduced fuel volume of air is introduced into the fuel tank 10 from the atmospheric port 43 of the canister 40, and the pressure in the fuel tank 10 is reduced. Always maintained at atmospheric pressure.

  As described above, according to the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention, it is possible to reliably prevent the fuel tank from being supplied with fuel of a specified amount or more.

  In addition, after the engine is started, the situation where the ventilation control valve 50 remains blocked for some reason, for example, a fuel droplet condensed with fuel vapor is interposed between the valve seat 51c and the valve portion 52a, When a situation occurs in which it is difficult for the valve portion 52a to be separated from the valve seat 51c due to the surface tension of the droplet, the ventilation control valve 50 of the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention has the fuel tank 10 in the valve body 52. A through hole 52 c is provided as a bypass means for communicating the internal space with the canister 40. Thereby, even if the valve body 52 remains seated on the valve seat 51c, the air flows from the fuel tank 10 toward the canister 40 through the through hole 52c. Even if this occurs, the pressure in the fuel tank 10 can be brought close to the atmospheric pressure. As the engine operation time elapses, the absolute value of the negative pressure on the fuel tank 10 side of the valve body 52 increases, and the pressure difference between the front and back sides of the valve body 52, that is, the negative pressure on the fuel tank 10 side and the positive pressure on the canister 40 side ( The pressure difference from the atmospheric pressure increases. The force acting on the valve body 52 due to this pressure difference acts in a direction that separates the valve body 52 from the valve seat 51c, that is, a direction that brings the ventilation control valve 50 into a communicating state. Therefore, even if the above-described situation occurs, the ventilation control valve 50 is brought into a communication state in a short time due to the vibration of the engine and the force due to the pressure difference between the front and back surfaces of the valve body 52. The diameter of the through-hole 52c is such that the refueling automatically stops, the valve portion 52a is seated on the valve seat 51c, and the space between the fuel tank 10 and the canister 40 is shut off for a predetermined time, for example, a refueling operator performs additional refueling. The time until the refueling gun 80 is removed from the fuel filler pipe 11 is recognized so that the refueling stop state of the refueling gun 80 can be reliably maintained.

(Second Embodiment)
FIG. 4 shows a state in which the fuel vapor processing apparatus 1 according to the second embodiment of the present invention is attached to the inside of the fuel tank 10. As shown in FIG. 4, the evaporative fuel processing apparatus 1 according to the second embodiment of the present invention is first configured except that a full tank control valve 60 is added and there is no breather pipe 12 of the fuel tank 10. This is the same as the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention described. That is, the structure, operation, and effect of the ventilation control valve 50 are the same as those of the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention described above.

  First, the function of the full tank control valve 60 provided in the evaporated fuel processing apparatus 1 according to the second embodiment of the present invention will be described. As shown in FIG. 4, the full tank control valve 60 is provided in the middle of the vent pipe 30, specifically, a section between the vent control valve 50 of the vent pipe 30 and the canister 40 and the inner space of the fuel tank 10. 2 is attached to the end of the fuel pipe 10 side of the ventilation pipe 70 as a ventilation passage. The full tank control valve 60 includes, for example, a float valve 61 formed so as to float in the fuel and a valve seat (not shown) formed on the opening periphery of the vent pipe 70. When the amount of fuel in the fuel tank 10 is less than the full tank state, the float valve 61 is away from the valve seat, and the full tank control valve 60 is in a communicating state. Therefore, the internal space of the fuel tank 10 communicates with the canister 40 via the full tank control valve 60, the vent pipe 70, and the vent pipe 30. When refueling the fuel tank 10 and the fuel amount in the fuel tank 10 increases and eventually approaches the full tank state, the float valve 61 of the full tank control valve 60 moves upward together with the fuel level to hit the valve seat. In contact therewith, the full tank control valve 60 is shut off and the vent pipe 70 is shut off. By the subsequent fueling, the pressure in the internal space of the fuel tank 10 rises, whereby the fuel level in the fuel filler pipe 11 rises toward the outer open end, that is, the fueling gun 80. When the fuel level in the fuel filler pipe 11 reaches the air hole 81 at the tip of the fuel gun 80 and the fuel closes the air hole 81, the fueling operation of the fuel gun 80 is automatically stopped and the fuel into the fuel tank 10 is stopped. Inflow stops. As described above, the full tank control valve 60 plays the role of automatically stopping the refueling when the fuel amount in the fuel tank 10 becomes full during refueling.

  By the way, even when the full tank control valve 60 is cut off, the internal space of the fuel tank 10 communicates with the canister 40 via the leakage prevention valve 20 to the vent pipe 30. When the ventilation control valve 50 is not provided in the middle of the ventilation pipe 30, the air in the fuel tank 10 is turned off by the leakage prevention valve 20, the ventilation pipe 30, and the canister 40 after the fueling operation of the fueling gun 80 automatically stops. Then, it flows to the outside, the pressure in the internal space of the fuel tank 10 decreases, the fuel level in the fuel filler pipe 11 decreases, and there is a possibility that the fuel gun 80 becomes ready to be refueled. Therefore, also in the evaporated fuel processing apparatus 1 according to the second embodiment of the present invention, the fuel supply operation of the fuel supply gun 80 is automatically stopped after the fuel supply operation of the fuel supply gun 80 is automatically stopped by arranging the ventilation control valve 50 in the middle of the ventilation pipe 30. It aims at maintaining the pressure in the internal space and maintaining the fuel level in the fuel filler pipe 11 at the fuel supply stop position.

  Next, the operation of the evaporated fuel processing apparatus 1 when refueling the fuel tank 10 of an automobile in which the evaporated fuel processing apparatus 1 according to the second embodiment of the present invention is mounted will be described.

  While the fuel tank 10 is being refueled, when the full tank control valve 60 is open, the air in the internal space of the fuel tank 10 passes through the leakage prevention valve 20 and the vent pipe 30 and reaches the canister 40, It flows out to the outside following two routes, a full tank control valve 60, a vent pipe 70, and a path to the canister 40 through the vent pipe 30. When the amount of fuel increases and the full tank control valve 60 is shut off, the air in the internal space of the fuel tank 10 flows only through the path to the canister 40 via the leakage prevention valve 20 and the vent pipe 30. When the fuel level in the fuel filler pipe 11 blocks the air hole 81 at the tip of the fuel supply gun 80 due to subsequent fuel supply, the fuel supply operation of the fuel supply gun 80 automatically stops. The operation of the ventilation control valve 50 after the automatic refueling of the fuel gun 80, that is, the process leading to the interruption of the ventilation pipe 30, is the same as that of the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention described above. Description is omitted.

  As described above, the evaporative fuel processing apparatus 1 according to the second embodiment of the present invention also maintains the internal space pressure of the fuel tank 10 after the automatic refueling and stops the refueling of the fuel gun 80 when refueling the fuel tank 10. The state can be maintained and additional refueling can be prevented.

  FIG. 5 shows a state in which the fuel vapor processing apparatus 1 according to a modification of the second embodiment of the present invention is attached to the inside of the fuel tank 10. The evaporative fuel processing apparatus 1 according to the modification of the second embodiment of the present invention is obtained by changing the attachment position of the ventilation control valve 50 with respect to the evaporative fuel processing apparatus 1 according to the second embodiment of the present invention described above. It is. That is, in the evaporative fuel processing apparatus 1 according to the second embodiment of the present invention, the ventilation control valve 50 is located in the ventilation pipe 30 at the junction of the leakage prevention valve 20, the ventilation pipe 30 and the ventilation pipe 70 as shown in FIG. However, in the evaporative fuel processing apparatus 1 according to the modification of the second embodiment of the present invention, as shown in FIG. 5, the junction between the vent pipe 30 and the vent pipe 70 and the canister 40 Arranged between.

  The fuel vapor processing apparatus 1 according to the modification of the second embodiment of the present invention also maintains the internal space pressure of the fuel tank 10 after the specified amount of fuel is supplied into the fuel tank 10, and An oil supply stop state can be maintained and additional oil supply can be prevented.

  In this modification, the ventilation control valve 50 may be set to shut off due to an increase in the air flow velocity in the valve chamber 51b due to the water hammer effect of the air flow generated when the full tank control valve 60 is shut off. Alternatively, after the full tank control valve 60 is shut off, the ventilation control valve 50 may be set to shut off due to an increase in the air flow rate in the valve chamber 51b due to the water hammer effect of the air flow that occurs when refueling automatically stops. Good.

(Third embodiment)
FIG. 6 shows a state in which the evaporated fuel processing apparatus 1 according to the third embodiment of the present invention is attached to the inside of the fuel tank 10. The evaporative fuel processing apparatus 1 according to the third embodiment of the present invention differs from the evaporative fuel processing apparatus 1 according to the first embodiment of the present invention described above in the configuration of the leakage prevention valve 90. In other words, the leakage prevention valve 90 of the evaporated fuel processing apparatus 1 according to the third embodiment of the present invention has a ventilation control valve integrated therein. Therefore, the effect of having the ventilation control valve 50 which is a characteristic configuration of the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention, that is, after the fuel of the specified amount is supplied into the fuel tank 10, the fuel The effect that the internal space pressure of the tank 10 can be maintained, the refueling stop state of the refueling gun 80 can be maintained, and the additional refueling can be prevented is the case of the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention. Is obtained in the same way.

  A structure of the leakage prevention valve 90 of the evaporated fuel processing apparatus 1 according to the third embodiment of the present invention, that is, a structure in which the ventilation control valve 50 is integrally incorporated will be described with reference to FIG. As shown in FIG. 7, the leakage prevention valve 90 includes a float valve 91 (described later) on the ceiling plate of the fuel tank 10, that is, the upper side wall plate of the fuel tank 10 when the fuel tank 10 is mounted on an automobile. It is attached to face the inside. The leakage prevention valve 90 is formed by housing a float valve 91 in a housing 92. The float valve 91 is set to float on the fuel, in other words, the apparent specific gravity is smaller than the specific gravity of the fuel. A valve portion 91 a is provided at the end of the float valve 91 opposite to the bottom of the fuel tank 10. The housing 92 is made of, for example, a resin material, and a passage 92g as a ventilation passage is provided on the side opposite to the float valve 91. As shown in FIG. 7, a valve seat 92f is provided on the outer periphery of the opening end on the fuel tank 10 side of the passage 92g. In a normal driving state of the automobile, the leakage prevention valve 90 is separated from the fuel level, and the float valve 91 is in the position shown in FIG. Accordingly, the passage 92g, that is, a communication passage for communication between the internal space of the fuel tank 10 and the canister 40 is opened. On the other hand, when the leakage prevention valve 90 is immersed in the fuel due to the change in the posture of the fuel tank 10, the float valve 91 moves upward in FIG. 7 due to the buoyancy of the fuel, and the valve portion 91a comes into close contact with the valve seat 92f. Thereby, the communication between the passage 92g, that is, the internal space of the fuel tank 10 and the canister 40 is blocked.

  As shown in FIG. 7, the housing 92 is provided with a valve chamber 92b adjacent to the end of the passage 92g on the canister 40 side. As shown in FIG. 7, the housing 92 is provided with a passage 92a as a ventilation passage on the opposite side of the passage 92g with the valve chamber 92b interposed therebetween. The valve chamber 92b is fitted with a shaft portion 93b of a valve body 93, which will be described later, and a bearing portion 92d for holding the valve body 93 so as to be rotatable about the shaft portion 93b. A stopper 92e for restricting the rotation angle position of 93 is provided. A valve seat 92c is formed on the peripheral edge of the opening facing the valve chamber 92b of the passage 92a on the canister 40 side of the valve chamber 92b so as to be in close contact with the valve portion 93a of the valve body 93 and to block the passage 92a. .

  The valve body 93 is made of, for example, a resin material or a metal material. As shown in FIG. 7, the valve body 93 has a valve portion 93a, a shaft portion 93b, and a valve portion 93a that are in close contact with the valve seat 92c of the housing 92, and the valve portion 93a is connected to the valve seat 92c. A through hole 93c is formed so that the passage 92a on the valve seat 92c side and the valve chamber 92b communicate with each other in a close contact state. The valve chamber 92b, the passage 92a, and the valve body 93 described above constitute a ventilation control valve. Thus, in the leakage prevention valve 90, in the direction from the internal space of the fuel tank 10 toward the canister 40, the leakage prevention valve portion (float valve 91, valve seat 92f), the ventilation control valve portion (valve element 93, valve seat). 92c).

  The operation of the ventilation control valve portion (valve element 93, valve seat 92c) in the leakage prevention valve 90 of the evaporated fuel processing apparatus 1 according to the third embodiment of the present invention is the evaporated fuel according to the first embodiment of the present invention described above. This is exactly the same as the case of the ventilation control valve 50 in the processing apparatus 1.

  According to the evaporated fuel processing apparatus 1 according to the third embodiment of the present invention, the number of components of the evaporated fuel processing apparatus 1 can be reduced, and the number of steps for assembling the evaporated fuel processing apparatus 1 to an automobile can be reduced.

(Fourth embodiment)
FIG. 8 shows a state in which the evaporated fuel processing apparatus 1 according to the fourth embodiment of the present invention is attached to the inside of the fuel tank 10. The evaporative fuel processing apparatus 1 according to the fourth embodiment of the present invention is different from the evaporative fuel processing apparatus 1 according to the second embodiment of the present invention described above in the configuration of the full tank control valve 100. That is, the full control valve 100 of the evaporated fuel processing apparatus 1 according to the fourth embodiment of the present invention has a ventilation control valve integrated therein. Therefore, the effect of having the ventilation control valve 50 which is a characteristic configuration of the evaporated fuel processing apparatus 1 according to the second embodiment of the present invention, that is, after the fuel of the specified amount is supplied into the fuel tank 10, the fuel The effect that the internal space pressure of the tank 10 can be maintained, the refueling stop state of the refueling gun 80 can be maintained, and the additional refueling can be prevented is the case of the evaporated fuel processing apparatus 1 according to the second embodiment of the present invention. Is obtained in the same way.

  A structure of the full tank control valve 100 of the evaporated fuel processing apparatus 1 according to the fourth embodiment of the present invention, that is, a structure in which the ventilation control valve 50 is integrally incorporated will be described with reference to FIG. As shown in FIG. 9, the full tank control valve 100 is provided with a float valve 101 (described later) on the ceiling plate of the fuel tank 10, that is, the upper side wall plate of the fuel tank 10 in a state where the fuel tank 10 is mounted on an automobile. 10 is attached so as to face the inside. The full tank control valve 100 is formed by housing a float valve 101 in a housing 102. The float valve 101 is set to float on the fuel, in other words, the apparent specific gravity is smaller than the specific gravity of the fuel. A valve portion 101 a is provided at the end of the float valve 101 opposite to the bottom of the fuel tank 10. The housing 102 is made of, for example, a resin material, and a passage 102g as a ventilation passage is provided on the side opposite to the float valve 101. As shown in FIG. 8, the passage 102 g is connected to the vent pipe 30 and communicates with the canister 40 through the vent pipe 30. As shown in FIG. 9, a valve seat 102f is provided on the outer periphery of the opening end on the fuel tank 10 side of the passage 102g. When the fuel level in the fuel tank 10 is lower than the full tank level F, that is, in the lower part in FIG. 9 and the float valve 101 of the full control valve 100 is away from the fuel level, the float valve 101 Is in the position shown in FIG. Therefore, the passage 102g, that is, the communication passage for communication between the internal space of the fuel tank 10 and the canister 40 is opened. On the other hand, when the fuel level in the fuel tank 10 is the full tank level F, the full tank control valve 100 is immersed in the fuel, and the float valve 101 moves upward in FIG. 9 due to the buoyancy of the fuel. Thus, the valve portion 101a is brought into close contact with the valve seat 102f, whereby the passage 102g, that is, the communication between the internal space of the fuel tank 10 and the canister 40 is blocked.

  As shown in FIG. 9, the housing 102 is provided with a passage 102h so as to open on the side wall surface opposite to the canister 40 side of the passage 102g. As shown in FIG. 9, the end portion of the passage 102h opposite to the passage 102g is adjacent to the end portion and opens into the valve chamber 102b. A passage 102a is provided on the opposite side of the passage 102h across the valve chamber 102b. As shown in FIG. 9, the passage 102 a is connected to the leakage prevention valve 20 and communicates with the internal space of the fuel tank 10 via the leakage prevention valve 20. The valve chamber 102b is fitted with a shaft portion 103b of a valve body 103, which will be described later, and a bearing portion 102d for holding the valve body 103 so as to be rotatable about the shaft portion 103b. A stopper 102e for restricting the rotation angle position 103 is provided. A valve seat 102c is formed at the periphery of the opening facing the valve chamber 102b of the passage 102h located on the canister 40 side of the valve chamber 102b so as to be in close contact with the valve portion 103a of the valve body 103 and shut off the passage 102h. Yes.

  The valve body 103 is made of, for example, a resin material or a metal material. As shown in FIG. 9, the valve body 103 has a valve portion 103 a that is in close contact with the valve seat 102 c of the housing 102, a shaft portion 103 b, and a valve portion 103 a that is substantially at the center of the valve portion 103 a. A through hole 103c is formed so that the passage 102h on the valve seat 102c side and the valve chamber 102b communicate with each other in a close contact state. The valve chamber 102b, the passage 102a, and the valve body 103 described above constitute a ventilation control valve. Thus, in the full tank control valve 100, the ventilation control valve portion (the valve body 103, the valve seat 102c) and the passage 30 from the ventilation control valve portion to the canister 40 are integrally incorporated, and the full tank control valve 100 is fully filled. A passage 102g, which is a ventilation passage from the control valve portion (float valve 101, valve seat 102f) to the canister 40, is formed so as to be connected in the middle of the passage 30 from the ventilation control valve portion to the canister 40.

  The operation of the ventilation control valve portion (valve body 103, valve seat 102c) in the full tank control valve 100 of the evaporated fuel processing apparatus 1 according to the fourth embodiment of the present invention is the evaporation according to the second embodiment of the present invention described above. This is exactly the same as the case of the ventilation control valve 50 in the fuel processing apparatus 1.

  According to the evaporative fuel processing apparatus 1 according to the fourth embodiment of the present invention, the number of components of the evaporative fuel processing apparatus 1 can be reduced, and the number of steps for assembling the evaporative fuel processing apparatus 1 to an automobile can be reduced.

(Fifth embodiment)
FIG. 10 shows a state in which the fuel vapor processing apparatus 1 according to the fifth embodiment of the present invention is attached to the fuel tank 10. The evaporative fuel processing apparatus 1 according to the fifth embodiment of the present invention differs from the evaporative fuel processing apparatus 1 according to the first embodiment of the present invention described above in the configuration of the ventilation control valve 550.

  Specifically, as shown in FIG. 11, the ventilation control valve 550 includes a casing 551, a valve body 552, an elastic member 553, and the like. The casing 551 forms a cylindrical valve chamber 551b whose axial direction substantially coincides with the horizontal direction when the ventilation control valve 550 is mounted on an automobile. Further, the casing 551 bisects the passage 51a into the internal space side of the fuel tank 10 and the canister 40 with the valve chamber 551b interposed therebetween, so that the passages 551as and 551ac are formed coaxially with the valve chamber 551b. Here, the casing 551 of the present embodiment is formed by manufacturing a cylindrical member that forms the internal space side passage 551as and a cylindrical member that forms the canister side passage 551ac from metal materials or resin materials, respectively, and joining them together.

  The casing 551 is formed with a conical valve seat 551c having a diameter reduced as it is separated from the internal space side passage 551as at the periphery of the opening 551d facing the valve chamber 551b in the canister side passage 551ac. The valve chamber 551b in the casing 551 accommodates a valve body 552 that can be seated and separated from the valve seat 551c, and is elastic so as to bias the valve body 552 in the direction away from the valve seat 551c. A member 553 is accommodated.

  The valve body 552 is formed of a resin material or a metal material in a stepped cylindrical shape in which the cylindrical portions 552a and 552b are connected by a stepped portion 552d, and is disposed concentrically in the valve chamber 551b. The valve body 552 can reciprocate in the axial direction by fitting a cylindrical large-diameter cylindrical portion 552b to the inner peripheral surface of the valve chamber 551b. Here, the outer circumferential surface of the large-diameter cylindrical portion 552b is formed with concave groove-shaped axial grooves 552e at a plurality of locations in the circumferential direction, so that foreign matter is caught between the valve body 552 and the valve chamber 551b. It has been suppressed. Each axial groove 552e of the present embodiment is provided with an axial length that does not reach the stepped portion 552d from the end opposite to the stepped portion 552d in the large-diameter cylindrical portion 552b.

  In the valve body 552, the conical small-diameter cylindrical portion 552a has a smaller diameter than the large-diameter cylindrical portion 552b, and the diameter decreases as the distance from the step portion 552d toward the canister-side passage 551ac increases. Thereby, the small diameter cylindrical portion 552a constitutes a valve portion that is seated on the valve seat 551c (see FIG. 11) or is separated from the valve seat 551c (see FIG. 12) in accordance with the movement of the valve body 552. Here, in the valve body 552 of the present embodiment, the first through hole 552c that forms the throttle passage 552f is formed in a cylindrical hole shape so as to penetrate the center of the tip end of the small diameter cylindrical portion 552a that functions as the valve portion in the axial direction. Is provided. Furthermore, in the valve body 552 of the present embodiment, the second through hole 552h that forms the communication passage 552g is formed in the first through hole 552c so as to penetrate through one place in the circumferential direction of the annular stepped portion 552d. It is provided in the shape of a cylindrical hole having a larger diameter. Accordingly, the communication passage 552g formed by the second through hole 552h has a larger flow path cross-sectional area than the throttle passage 552f formed by the first through hole 552c. In other words, the throttle passage 552f formed by the first through hole 552c has a shape in which the flow passage cross-sectional area is narrowed compared to the communication passage 552g formed by the second through hole 552h.

  In this embodiment, the elastic member 553 as the urging means is a compression coil spring made of a metal wire, and is arranged concentrically in the valve chamber 551b. The elastic member 553 interposed between the casing 551 and the step portion 552d of the valve body 552 is compressed in accordance with the movement of the valve body 552 in the seating direction on the valve seat 551c toward the canister side passage 551ac. Elastically deforms. By this compression elastic deformation, the elastic member 553 generates a restoring force that urges the valve body 552 in the direction away from the valve seat 551c toward the internal space side passage 551as.

  Here, FIG. 11 shows the ventilation control valve 550 when the small-diameter cylindrical portion 552a is seated on the valve seat 551c by the valve body 552 moving toward the canister-side passage 551ac against the biasing of the elastic member 553. The state is shown. When the small diameter cylindrical portion 552a is seated on the valve seat 551c, both ends of the second through hole 552h open toward the valve chamber 551b, but the outer peripheral surface of the small diameter cylindrical portion 552a is in close contact with the valve seat 551c. As a result, the communication passage 552g is blocked between the internal space side passage 551as communicating with the valve chamber 551b and the canister side passage 551ac, so that the passage 51a including the passages 551as and 551ac is cut off. However, at this time, since both ends of the first through hole 552c open toward the valve chamber 551b and the opening 551d, the throttle passage 552f connects the internal space side passage 551as communicating with the valve chamber 551b to the canister side passage 551ac. Can also communicate. As a result, an air flow containing fuel vapor (hereinafter simply referred to as “air flow”) is restricted between the passages 551as and 551ac communicating with each other via the throttle passage 552f. Thus, in the present embodiment, the first through hole 552c and the throttle passage 552f formed by the hole 552c function as bypass means.

  FIG. 12 shows the state of the ventilation control valve 550 when the small diameter cylindrical portion 552a is separated from the valve seat 551c by moving the valve body 552 toward the internal space side passage 551as by the urging of the elastic member 553. Show. When the small diameter cylindrical portion 552a is separated from the valve seat 551c, both end portions of the second through hole 552h are not only opened toward the valve chamber 551b, but the outer peripheral surface of the small diameter cylindrical portion 552a is separated from the valve seat 551c. To do. As a result, the communication passage 552g communicates with the passage 51a in the valve chamber 551b between the internal space side passage 551as and the canister side passage 551ac. At this time, both end portions of the first through hole 552c open to the valve chamber 551b, so that the throttle passage 552f communicates with the passages 551as and 551ac via the valve chamber 551b, but the flow passage cross-sectional area is larger than the communication passage 552g. It is difficult for the air flow to pass through the small throttle passage 552f. Therefore, an air flow can pass between the passages 551as and 551ac with a large flow rate through the communication passage 552g having a large flow path cross-sectional area.

  In the fifth embodiment having the above-described configuration, the operation of the ventilation control valve 550 in the evaporated fuel processing apparatus 1 during refueling to the fuel tank 10 will be described focusing on differences from the first embodiment.

  When fuel flows into the fuel tank 10 due to the start of refueling from the refueling gun 80 inserted into the fuel filler pipe 11, an air flow passes through the valve chamber 551b of the ventilation control valve 550 from the internal space side passage 551as to the canister side passage 551ac. Pass toward. As a result, the fluid force of the air flow acts on the valve body 552 in the valve chamber 551b toward the canister-side passage 551ac, that is, in the seating direction on the valve seat 551c. However, since the speed of the air flow at this time is the speed “the flow speed of the air flow is lower than a predetermined value” according to claim 1, the valve body 552 is separated from the valve seat 551c by the urging of the elastic member 553. The communication state of the passage 51a is maintained between the internal space of the fuel tank 10 and the canister 40.

  Thereafter, when the refueling operation of the refueling gun 80 is automatically stopped, the speed of the air in the valve chamber 551b increases momentarily due to the water hammer action, and the “flow velocity of the air flow exceeds a predetermined value” according to claim 1. It becomes speed. The fluid force of the air flow thus increased in speed acts, so that the valve body 552 is seated on the valve seat 551c to block communication of the passage 51a between the internal space of the fuel tank 10 and the canister 40. Then, the pressure in the fuel tank 10 is temporarily held at the pressure that has risen above the atmospheric pressure on the canister 40 side due to the inflow of fuel into the fuel tank 10 until just before shutoff. Therefore, immediately after the shut-off, the valve body 552 maintains the seated state on the valve seat 551c against the urging of the elastic member 553 due to the pressure in the fuel tank 10 higher than the atmospheric pressure. The 80 air holes are blocked, and supercharging (additional refueling) can be suppressed. Note that the diameter of the first through hole 552c forming the throttle passage 552f is such that the pressure in the fuel tank 10 is kept high during the time until the fuel filler pipe 11 is removed from the fuel filler pipe 11 after the passage 51a is shut off. For example, it is set to 0.5 mm so that the refueling stop state can be maintained.

  In such a blocked state of the passage 51a, the internal space side passage 551as and the canister side passage 551ac in the passage 51a can communicate with each other depending on the throttle passage 552f that restricts the air flow. Therefore, after the refueling operation automatically stops and the passage 51a is shut off, the pressure in the fuel tank 10 gradually decreases from a pressure higher than the atmospheric pressure. In this embodiment, the valve body 552 resists the biasing of the elastic member 553 until the pressure in the fuel tank 10 received through the internal space side passage 551as and the valve chamber 551b reaches a predetermined valve opening pressure. Thus, the seating state on the valve seat 551c is maintained. Accordingly, when a substantially constant time has elapsed since the shut-off, the pressure in the fuel tank 10 becomes equal to or lower than the valve opening pressure, so that the valve body 552 is urged by the elastic member 553 and is separated from the valve seat 551c. A passage 51 a communicates between the internal space of the tank 10 and the canister 40. As described above, the pressure gradually reducing action of the throttle passage 552f and the opening action of the ventilation control valve 550 ensure that the pressure in the fuel tank 10 becomes the atmospheric pressure after the automatic refueling operation is stopped, so that deformation of the fuel tank 10 is avoided. Can be done.

  Now, in the valve chamber 551b between the passages 551as and 551ac in the communication state of the passage 51a, the air flow passes through the communication passage 552g having a large channel cross-sectional area in preference to the throttle passage 552f having a small channel cross-sectional area. Therefore, after the passage of the passage 51a which has been cut off due to the automatic stop of the refueling operation, for example, during engine operation, an amount of air or fuel vapor corresponding to the pressure fluctuation in the fuel tank 10 is supplied to the passage 51a. The fuel tank 10 can be smoothly deformed to suppress deformation of the fuel tank 10. Further, even if the shutoff state of the passage 51a is maintained due to the valve body 552 becoming difficult to separate from the valve seat 551c, the valve body 552 becomes negative due to the negative pressure on the fuel tank 10 side as the engine operation time elapses. The passage 51a can be forcibly communicated by being sucked away from the valve seat 551c. The diameter of the second through hole 552h that forms the communication passage 552g is set to, for example, 1.5 mm so as to realize a smooth air flow in the communication state of the passage 51a.

(Sixth embodiment)
FIG. 13 shows a state in which the fuel vapor processing apparatus 1 according to the sixth embodiment of the present invention is attached to the fuel tank 10. The evaporative fuel processing apparatus 1 according to the sixth embodiment of the present invention has an additional leakage prevention valve 20 added to the evaporative fuel processing apparatus 1 according to the fifth embodiment of the present invention described above, The configuration of the ventilation control valve 650 is different.

  Specifically, the vent pipe 30 is branched on the fuel tank 10 side from the vent control valve 650 to form a pair of branch pipes 630. An individual leakage prevention valve 20 is connected in series to the end of each branch pipe 630 on the fuel tank 10 side and attached to the fuel tank 10. The structure, operation, and effect of each leakage prevention valve 20 are the same as those of the evaporated fuel processing apparatus 1 according to the first embodiment of the present invention described above.

  As shown in FIG. 14, the casing 551 of the ventilation control valve 650 has a part of the internal space side passage 551as and the canister side passage 551ac with respect to the valve chamber 551b whose axial direction substantially coincides with the vertical direction when mounted on the automobile. Are formed on the same axis. Particularly in this embodiment, the canister-side passage 551ac that forms the valve seat 551c by the periphery of the opening 551d is disposed above the internal space-side passage 551as across the valve chamber 551b, so that the valve seat The seating direction of the valve body 552 with respect to 551c is set downward in the vertical direction. Further, the casing 551 is formed with a pair of branch passages 651as that constitute the branch pipes 630 as the remaining portion of the internal space side passage 551as so that the axial direction substantially coincides with the horizontal direction when the ventilation control valve 650 is mounted on the automobile. is doing.

  According to such a ventilation control valve 650, when the pressure in the fuel tank 10 is reduced to a valve opening pressure or less by the throttle passage 552f in a state where the passage 51a is blocked due to the automatic stop of the refueling operation, the valve body 552 is elastic. The member 553 is separated from the valve seat 551c by the urging force and its own weight. As a result, the passage 51a communicates between the internal space of the fuel tank 10 and the canister 40. Therefore, according to the sixth embodiment of the present invention, as in the case of the fifth embodiment of the present invention, after the refueling operation is automatically stopped, the pressure in the fuel tank 10 is surely changed to the atmospheric pressure, and the deformation of the fuel tank 10 is prevented. Can be avoided. In addition to the points described above, the ventilation control valve 650 has the same structure, operation, and effects as the ventilation control valve 550 of the fifth embodiment of the present invention described above.

(Seventh embodiment)
FIG. 15 shows the structure of the ventilation control valve 750 of the evaporated fuel processing apparatus 1 according to the seventh embodiment of the present invention. The evaporative fuel processing apparatus 1 according to the seventh embodiment of the present invention differs from the evaporative fuel processing apparatus 1 according to the sixth embodiment of the present invention described above in the configuration of the ventilation control valve 750.

  Specifically, the elastic member 553 is not accommodated in the valve chamber 551b formed by the casing 551 of the ventilation control valve 750. As a result, in the ventilation control valve 750, the valve body 552 that receives the gravitational action is urged downward in the vertical direction only by its own weight, that is, in the direction away from the valve seat 551c. Thus, in this embodiment, the biasing means is realized by the structure of the ventilation control valve 750 that can bias the valve body 552 by its own weight.

  According to such a ventilation control valve 750, when the pressure in the fuel tank 10 is reduced to a valve opening pressure or less by the throttle passage 552f in a state where the passage 51a is blocked due to the automatic stop of the refueling operation, the valve body 552 is caused by its own weight. Is separated from the valve seat 551c. As a result, the passage 51a communicates between the internal space of the fuel tank 10 and the canister 40. Therefore, according to the seventh embodiment of the present invention, as in the sixth embodiment of the present invention, after the refueling operation is automatically stopped, the pressure in the fuel tank 10 is surely changed to the atmospheric pressure, and the deformation of the fuel tank 10 is prevented. Can be avoided. In addition to the points described above, the ventilation control valve 750 has the same structure, operation, and effect as the ventilation control valve 550 of the fifth embodiment of the present invention described above.

(Eighth embodiment)
FIG. 16 shows the structure of the ventilation control valve 850 of the evaporated fuel processing apparatus 1 according to the eighth embodiment of the present invention. The evaporative fuel processing apparatus 1 according to the eighth embodiment of the present invention differs from the evaporative fuel processing apparatus 1 according to the fifth embodiment of the present invention described above in the configuration of the ventilation control valve 850.

  Specifically, the valve body 552 of the ventilation control valve 850 is not provided with the through hole 552c but is provided with only the through hole 552h that forms the communication passage 552g. Instead, in the ventilation control valve 850, a concave groove 851c that forms a throttle passage 851f is provided in the valve seat 551c. Here, the concave groove 851c is formed in a linear groove shape along the generatrix of the conical surface forming the valve seat 551c, and is open to the conical surface. Therefore, in the present embodiment, the opening of the concave groove 851c is closed in the valve seat 551c on which the small-diameter cylindrical portion 552a is seated, thereby forming a throttle passage 851f whose passage cross-sectional area is smaller than that of the communication passage 552g. It has become so.

  FIG. 16 shows the state of the ventilation control valve 850 when the small diameter cylindrical portion 552a is seated on the valve seat 551c by the valve body 552 moving toward the canister side passage 551ac against the bias of the elastic member 553. Show. When the small diameter cylindrical portion 552a is seated on the valve seat 551c, the communication passage 552g is closed between the passages 551as and 551ac in the same manner as in the fifth embodiment described above. The passage 51a composed of 551ac is cut off. At this time, in this embodiment, since both ends of the groove 851c in the linear direction open toward the valve chamber 551b and the opening 551d, the throttle passage 851f connects the internal space side passage 551as communicating with the valve chamber 551b on the canister side. It connects also with the channel | path 551ac. As a result, the air flow is throttled between the passages 551as and 551ac communicating with each other via the throttle passage 851f. Thus, in this embodiment, the recessed groove 851c and the throttle passage 851f formed by the groove 851c function as bypass means.

  FIG. 17 shows the state of the ventilation control valve 850 when the small-diameter cylindrical portion 552a is separated from the valve seat 551c by the valve body 552 moving toward the internal space side passage 551as by the urging of the elastic member 553. Show. When the small-diameter cylindrical portion 552a is separated from the valve seat 551c, the communication passage 552g communicates with the passage 51a in the valve chamber 551b between the passages 551as and 551ac as in the case of the fifth embodiment described above. It becomes a state to do. At this time, in this embodiment, the opening of the concave groove 851c opens toward the canister-side passage 551ac, so that the throttle passage 851f substantially becomes a part of the canister-side passage 551ac. Thus, an air flow can pass between the passages 551as and 551ac with a large flow rate through the communication passage 552g having a large flow path cross-sectional area.

  According to such a ventilation control valve 850, when the passage 51a is shut off due to the automatic stop of the refueling operation, the air flow between the internal space side passage 551as and the canister side passage 551ac is restricted in the passage 51a. Communication can be achieved through the passage 851f. Therefore, after the shut-off, the pressure in the fuel tank 10 that slowly decreases from a pressure higher than the atmospheric pressure becomes equal to or lower than the valve opening pressure, so that the valve body 552 is separated from the valve seat 551c, and the fuel tank 10 The communication of the passage 51a between the inner space and the canister 40 is realized. Therefore, according to the eighth embodiment of the present invention, as in the case of the fifth embodiment of the present invention, after the automatic refueling operation is stopped, the pressure in the fuel tank 10 surely becomes the atmospheric pressure, and the fuel tank 10 is not deformed. Can be avoided. In addition to the points described above, the ventilation control valve 850 has the same structure, operation, and effect as the ventilation control valve 550 of the fifth embodiment of the present invention described above.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and various embodiments and combinations can be made without departing from the scope of the present invention. Can be applied.

  In the evaporative fuel processing apparatus 1 according to the first to fourth embodiments, the valve body of the ventilation control valve 50 or the ventilation control valve portion is formed in a plate shape, and the plane portion is brought into close contact with the valve seat to block the passage. The shape of the valve body may not be flat. For example, as the ventilation control valve, a ball valve having a spherical valve body, that is, a ball valve 110 including a ball 111 and a valve seat 112b as shown in FIG. 18 may be used. The ball 111 is formed into a spherical shape with metal or resin, while the valve seat 112b is formed into a conical surface. When the ball 111 is seated on the valve seat 112b, its tangent becomes circular and the passage is blocked. During refueling to the fuel tank 10, the ball 111 is separated from the valve seat 112 b, and the internal space of the fuel tank 10 communicates with the canister 40. The direction in which air flows in the ventilation control valve from the internal space of the fuel tank 10 toward the canister 40 is the direction of the white arrow in FIG. Eventually, when a specified amount of fuel is supplied into the fuel tank 10 and the automatic refueling stop function of the fuel supply gun 80 is activated, the ball 111 receives the fluid force due to the instantaneous increase in the air flow velocity flowing through the ventilation control valve. 18 moves to the right and closes the valve seat 112b to block communication between the internal space of the fuel tank 10 and the canister 40, as shown in FIG. Thereby, the internal space pressure of the fuel tank 10 can be maintained, the fuel supply stop state of the fuel supply gun 80 can be maintained, and additional fuel supply can be prevented. When the engine is started and the automobile starts running, the vibration is transmitted to the ventilation control valve, and the ball 111 rolls from the valve seat 112b and settles at a position indicated by a broken line in FIG. Thereby, the space between the fuel tank 10 and the canister 40 is communicated. As the value of Dv / Db, which is the ratio of the diameter Dv of the circle, which is the shape of the contact portion between the ball 111 and the valve seat 112b, to the diameter Db of the ball 111 is smaller, the ball 111 rolls off the valve seat 112b with a smaller force. be able to.

  In the fuel vapor processing apparatus 1 according to the first to fourth embodiments, the through hole 52c is provided in the valve portion 52a as a bypass means provided in the ventilation control valve 50 or the ventilation control valve portion. You may provide the groove | channel which connects the channel | path 51a and the valve chamber 51b in the surface at the side of the valve seat 51c of the part 52a. Alternatively, the portion where the bypass means is provided may be the valve seat 51c instead of the valve body 52, and a groove that communicates the passage 51a and the valve chamber 51b may be provided in the valve seat 51c.

  In the evaporated fuel processing apparatus 1 according to the fifth to eighth embodiments, for example, as shown in FIG. 19 (the figure is a modification of the fifth embodiment), the axial groove 552e is formed in the valve body 552 without the through hole 552h. The communication passage 552g may be formed by the groove 552e by extending at least one of the large diameter cylindrical portion 552b in the entire axial direction. Further, the ventilation control valves 550 and 850 of the evaporated fuel processing apparatus 1 according to the fifth and eighth embodiments are employed as the ventilation control valve 50 or the ventilation control valve section of the evaporated fuel processing apparatus 1 according to the first to fourth embodiments. May be. Furthermore, the ventilation control valves 650 and 750 of the evaporated fuel processing apparatus 1 according to the sixth and seventh embodiments are configured according to the first to fourth embodiments in such a manner that the internal space side passage 551as is not branched into a pair of passages 651as. You may employ | adopt as the ventilation control valve 50 or the ventilation control valve part of the evaporative fuel processing apparatus 1. FIG.

  In the evaporated fuel processing apparatus 1 according to the sixth and seventh embodiments, instead of the through holes 552h and the throttle passage 552f of the ventilation control valves 650 and 750, the recesses of the ventilation control valve 850 of the evaporated fuel processing apparatus 1 according to the eighth embodiment. A groove 851c and a throttle passage 851f may be employed. Further, in the evaporated fuel processing apparatus 1 according to the fifth to seventh embodiments, in addition to the through holes 552h and the throttle passage 552f of the ventilation control valves 550, 650, 750, the ventilation control of the evaporated fuel processing apparatus 1 according to the eighth embodiment. A concave groove 851c and a throttle passage 851f of the valve 850 may be employed.

  For the ventilation control valves 550, 650, and 850 of the fuel vapor processing apparatus 1 according to the fifth, sixth, and eighth embodiments, the axial direction of the valve chamber 551b may be set as appropriate in addition to the direction described. In addition, regarding the ventilation control valve 750 of the evaporated fuel processing apparatus 1 according to the seventh embodiment, in addition to the axial direction of the valve chamber 551b, the separating direction of the valve body 552 from the valve seat 551c is relative to the vertical direction. As long as it becomes downward in the inclination direction, it may be set appropriately.

DESCRIPTION OF SYMBOLS 1 Evaporative fuel processing apparatus, 10 Fuel tank, 11 Fuel filler pipe, 12 Breather pipe, 20 Leak prevention valve, 21 Float valve, 30 Ventilation pipe (ventilation passage), 40 Canister, 41 Casing, 42 Ventilation port, 43 Atmospheric port, 44 activated carbon, 50 ventilation control valve, 51 casing, 51a passage (ventilation passage), 51b valve chamber, 51c valve seat, 51d bearing portion, 51e stopper, 52 valve body, 52a valve portion, 52b shaft portion, 52c through hole (bypass) Means), 60 full control valve, 61 float valve, 70 vent pipe (second vent passage), 80 oil supply gun, 81 air hole, 90 leakage prevention valve, 91 float valve, 92 housing, 92a passage (vent passage), 92b valve chamber, 92c valve seat, 92d bearing, 92e stopper, 2f Valve seat, 92g passage (ventilation passage), 93 valve body, 93a valve portion, 93b shaft portion, 93c through hole (bypass means), 100 full control valve, 101 float valve, 102 housing, 102a passage (ventilation passage) , 102b Valve chamber, 102c Valve seat, 102d Bearing portion, 102e Stopper, 102f Valve seat, 102g passage (ventilation passage), 102h passage (ventilation passage), 103 valve body, 103a valve portion, 103b shaft portion, 103c through hole ( Bypass means), 110 ball valve (ventilation control valve), 111 ball (valve element), 112b valve seat, 550 ventilation control valve, 551 casing, 551ac canister side passage, 551as internal space side passage, 551b valve chamber, 551c valve seat , 551d Opening, 552 Valve body, 552a Small diameter cylindrical part, 5 2b Large diameter cylindrical portion, 552c First through hole (through hole / bypass means), 552d Stepped portion, 552e Axial groove, 552f Restriction passage (bypass means), 552g Communication passage, 552h Second through hole, 553 Elastic member ( Urging means), 630 branch pipe, 650 ventilation control valve, 651as branch passage, 750 ventilation control valve (biasing means), 850 ventilation control valve, 851c concave groove (bypass means), 851f throttle passage (bypass means), F Full tank level

Claims (14)

A ventilation passage communicating the internal space of the fuel tank and the canister;
An evaporative fuel processing apparatus, comprising: a leakage prevention valve disposed in the middle of the ventilation passage and normally communicating with the ventilation passage and blocking the ventilation passage when the attitude of the fuel tank changes beyond a limit. And
A ventilation control valve that is arranged in the middle of the ventilation passage and between the leakage prevention valve and the canister and that switches communication / blocking of the ventilation passage,
The ventilation control valve communicates the ventilation passage when the flow velocity of the airflow flowing through the ventilation passage from the internal space toward the canister is lower than a predetermined value, and shuts off the ventilation passage when the flow velocity exceeds the predetermined value. The evaporative fuel processing apparatus characterized by the above-mentioned. A second ventilation passage that communicates between the internal space and the canister, or communicates between the internal space and a portion of the ventilation passage between the leakage cutoff valve and the canister;
It is disposed in the middle of the second ventilation passage and normally communicates with the second ventilation passage. When the fuel amount in the fuel tank reaches a predetermined amount when the fuel tank is refueled, the second ventilation passage is blocked. The fuel vapor processing apparatus according to claim 1, further comprising a tank control valve.   The evaporative fuel processing device according to claim 1 or 2, wherein the ventilation control valve switches from a shut-off state to a communication state when vibration is transmitted from the outside.   The evaporative fuel processing apparatus according to any one of claims 1 to 3, wherein the ventilation control valve is formed integrally with the leakage prevention valve.   The evaporative fuel processing apparatus according to claim 2, wherein the ventilation control valve is formed integrally with the full tank control valve. The ventilation control valve includes a valve seat formed at a peripheral edge of the ventilation passage, and a valve body that is movably disposed in the ventilation passage by the action of fluid force of an air flow that flows from the inner space toward the canister. With
The vent passage is blocked by the valve body being seated on the valve seat, and the vent passage is communicated by the valve body being separated from the valve seat,
The bypass means for maintaining communication between the internal space and the canister even when the valve body is seated on the valve seat is provided. Evaporative fuel processing equipment.   The said bypass means is provided with the through-hole provided in the said valve body, The evaporative fuel processing apparatus of Claim 6 characterized by the above-mentioned. The ventilation passage is divided into the internal space side and the canister side across the ventilation control valve, thereby forming an internal space side passage and a canister side passage,
The bypass means includes a throttle passage that is provided in the ventilation control valve and restricts an air flow between the internal space side passage and the canister side passage,
The evaporated fuel processing according to claim 6 or 7, wherein the throttle passage communicates between the internal space side passage and the canister side passage when the valve body is seated on the valve seat. apparatus. The ventilation control valve further includes a valve chamber communicating with the internal space side passage and accommodating the valve body,
The valve seat is provided at the periphery of the opening facing the valve chamber of the canister side passage,
The bypass means is provided in the valve body, and when the valve body is seated on the valve seat, through-holes open at both ends toward the valve chamber and the opening of the canister side passage, respectively. The evaporative fuel processing apparatus according to claim 8, wherein: The ventilation control valve further includes a valve chamber communicating with the internal space side passage and accommodating the valve body,
The valve seat is provided at the periphery of the opening facing the valve chamber in the canister side passage,
The bypass means is provided in the valve seat, and the throttle passage is formed by a concave groove whose both ends open toward the valve chamber and the opening of the canister side passage when the valve body is seated on the valve seat. The evaporative fuel processing apparatus according to claim 8 or 9, wherein the fuel vapor processing apparatus is formed. The ventilation control valve further includes a communication passage provided in the valve body with a flow passage cross-sectional area larger than the throttle passage,
The communication passage communicates the vent passage between the internal space side passage and the canister side passage when the valve body is separated from the valve seat, and the seat is located when the valve body is seated on the valve seat. 11. The fuel vapor processing apparatus according to claim 8, wherein the fuel vapor processing apparatus is closed between an internal space side passage and the canister side passage. The ventilation control valve further includes an urging means for urging in a direction away from the valve seat,
The urging means is applied to the valve body when a fluid force of an air flow acting from the internal space side passage toward the canister side passage acts and a pressure in the fuel tank received through the internal space side passage increases. 12. The fuel vapor processing apparatus according to claim 8, wherein the fuel vapor processing apparatus is seated on the valve seat against the urging force.   The evaporated fuel processing apparatus according to claim 12, wherein the urging unit includes an elastic member that generates a restoring force that urges the valve body in a direction away from the valve seat by elastic deformation. .   The evaporative fuel processing device according to claim 12 or 13, wherein the urging means urges the valve body in a direction away from the valve seat by its own weight.

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