JP2013002380A - Canister valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a canister valve device 1 in which a pressure loss between a canister 2 and an intake path 10 is reduced, the total number of components is not increased and assembly steps are not increased, either, thereby making the device advantageous in cost.SOLUTION: With electrification and non-electrification of a coil body 14, a lead-in port 7a is opened/closed but if a positive pressure is generated in an intake vicinity part 8A while a supercharger is operated, a second valve element 22 receives the positive pressure in the direction of closing the lead-in port 7a at all times. As a result, during the non-electrification of the coil body 14, a closed state of the lead-in port 7a is maintained by the second valve element 22 and at the electrification, the second valve element 22 is displaced to close the lead-in port 7a, thereby preventing a steam component 4 of fuel from flowing back from a lead-out port 8a to the lead-in port 7a. With the elimination of need of a check valve, the total number of components is not increased and assembly steps are not increased, either, thereby making a canister valve device advantageous in cost.

Description

  The present invention relates to a canister valve device for storing a vapor component of fuel generated from a fuel tank in a canister and supplying the vapor component to an intake passage of an engine.

In a vehicle equipped with an internal combustion engine, for example, as described in Patent Documents 1 and 2, the vapor component of the fuel stored in the fuel tank is prevented from leaking outside from the viewpoint of environmental protection.
An example of this configuration is shown in FIG. In FIG. 5A, when the pressure difference between the fuel tank 60 and the canister 61 exceeds a specified value, the vapor component 60A of the fuel in the fuel tank 60 is transferred into the canister 61 through the vent pipe 62 as shown by an arrow E1. Be guided to. In the canister 61, the vapor component 60A is accommodated inside by adsorption to activated carbon (not shown). When the vapor component 60A of the fuel adsorbed on the activated carbon reaches a certain concentration, as shown by an arrow E2, the introduction of the guide pipe 61a, the outlet pipe 63, the canister valve device 64, the introduction pipe 65, and the connection pipe 60a. It is led to an intake pipe 66 of an engine (not shown) via a path 65B and used for a combustion stroke.

The canister valve device 64 opens and closes the valve body by duty ratio control. As shown in FIG. 5B, the inlet port 65a communicating with the inlet tube 65 and the outlet port 63a communicating with the outlet tube 63 are provided as casings. 67. The introduction port 65 a is provided with a valve body 69 urged so as to close the introduction port 65 a by a compression coil spring 68. When the coil body 70 is energized, the valve body 69 moves away from the introduction port 65a against the urging force of the compression coil spring 68 and opens the introduction port 65a, and the vapor component 60A of the fuel opens the introduction tube 65 and the connection tube 60a. Through the intake pipe 66.
Energization / non-energization of the coil body 70 by duty ratio control is performed by an engine control unit (not shown) based on the air-fuel ratio of the air-fuel mixture, and the valve body 69 is controlled according to the air-fuel ratio of the air-fuel mixture. Opening and closing operations are continuously performed at a predetermined cycle.

German Patent Invention No. 3802664 Japanese Patent No. 2530993

However, in an internal combustion engine equipped with a supercharger such as a supercharger or a turbocharger in the fuel system, a positive pressure is generated in the adjacent pipe portion 65A of the connecting pipe 60a adjacent to the intake pipe 66 every time the supercharger operates. .
When the coil body 70 is energized, since the introduction port 65a is open, the vapor component 60A of the fuel is guided as indicated by the arrow E3 by the positive pressure generated in the neighboring pipe portion 65A due to the operation of the supercharger. There is a possibility that the gas flows backward from the outlet 63a to the canister 61 through the outlet pipe 63 and the guide pipe 61a in this order.

When the coil body 70 is not energized, the introduction port 65 a is closed by the valve body 69, but the positive pressure in the adjacent pipe portion 65 A acts in the direction of pressing the valve body 69, and the valve body 69 is connected to the compression coil spring 68. There is a risk that the introduction port 65a may be released from the introduction port 65a against the urging force.
In order to prevent the backflow of the vapor component 60A of the fuel, as shown in FIG. 6, a check valve 72 is newly provided in the connecting pipe 60a, and when the supercharger 73 is activated, the inside of the nearby pipe portion 65A becomes positive pressure. However, it is conceivable that the positive pressure is stopped by the check valve 72 and does not act on the valve element 69.

  However, if a separate check valve 72 is provided in the connecting pipe 60a, the pressure loss generated in the introduction path 65B increases, and the efficiency of supplying the fuel vapor component 60A from the canister 61 to the intake pipe 66 may be reduced. . Further, the provision of the check valve 72 increases the total number of parts, increases the number of assembly steps, and is disadvantageous in terms of cost, and may not be suitable for mass production.

  The present invention has been made in view of the above circumstances, and the purpose thereof is that the pressure loss between the canister and the intake passage does not increase, the vapor component of fuel can be efficiently supplied from the canister to the intake pipe, and the whole The number of parts is not increased, the assembly process is not increased, and it is advantageous in terms of cost, and it is to provide a valve device for a canister that is suitable for mass production as being mounted on a vehicle.

(About claim 1)
In the canister valve device, the canister is provided with a material element that receives and adsorbs the vapor component from the fuel tank. The valve main body has an introduction port for introducing a steam component from the canister and a lead-out port for leading the steam component from a lead-out pipe to an intake passage of an engine provided with a supercharger. The valve body includes a coil body, a movable iron core, and a second valve body made of a magnetic material.
The coil body is disposed in the casing, the movable iron core has a first valve body, and the first valve body is placed in the first position and the first position in the direction of separation with respect to the inlet as the coil body is energized and de-energized. Reciprocate between two positions.
The second valve body is provided between the first valve body and the introduction port and is displaced in a direction to open and close the introduction port in conjunction with the movable iron core, and is always urged to open the introduction port by a spring member. Has been. When positive pressure is generated in the vicinity of the intake air close to the intake passage in the outlet pipe during the operation of the supercharger, the second valve body receives the positive pressure, so that the inlet port is resisted against the biasing force of the spring member. Close.

In claim 1, when the turbocharger is not operated, the intake vicinity portion of the outlet pipe is negative pressure, and the inlet port is normally opened and closed by the second valve body as the coil body is energized and de-energized. Therefore, the vapor component of the fuel corresponding to the opening ratio of the inlet can be supplied from the canister to the intake passage through the inlet pipe and the outlet pipe.
Further, when a positive pressure is generated in the vicinity of the intake during the operation of the supercharger, the second valve body receives the positive pressure and closes the introduction port.
For this reason, when the coil body is not energized, the closed state of the introduction port is maintained by the second valve body, and when energized, the second valve body is displaced so as to close the introduction port, and communication from the outlet port to the introduction port is established. The fuel vapor component is prevented from flowing back from the outlet to the inlet.
As a result, there is no need to provide a check valve in the outlet pipe, the pressure loss between the canister and the intake passage does not increase, and the vapor component of the fuel can be efficiently supplied from the canister to the intake passage.
As the check valve becomes unnecessary, the total number of parts does not increase and the assembly process does not increase, which is advantageous in terms of cost and suitable for mass production as a vehicle mounting.

(About claim 2)
The elastic member biases the movable iron core in the direction of the introduction port when the coil body is not energized, and presses the second valve body against the biasing force of the spring member by the first valve body, at the second position. The inlet port is closed by the second valve body to prevent communication from the inlet port to the outlet port.
When the coil body is energized, the movable iron core displaces the first valve body to the first position and opens the introduction port. Along with this, communication from the inlet to the outlet is allowed, and when positive pressure is generated in the vicinity of the intake during operation of the turbocharger, the second valve body receives positive pressure and the spring member is attached. Displace to the second position against the force and close the inlet.

According to claim 2, when the coil body is not energized, the movable iron core is biased in the direction of the introduction port, and an elastic member that closes the introduction port by the second valve body is provided. Thus, the inlet can be opened and closed, and when a positive pressure is generated in the vicinity of the intake during the operation of the supercharger, the inlet can be closed by the second valve body.
Thus, the vapor component of the fuel does not flow back from the outlet to the inlet when the supercharger is operated, and the same effect as in the first aspect can be obtained.

(Claim 3)
The spring member is a tension spring. When the coil body is energized, the movable valve core displaces the first valve body to the first position and away from the second valve body, so that the second valve body is displaced to the first position by the biasing force of the tension spring and the introduction port is opened. Open. When positive pressure is generated in the vicinity of the intake when the turbocharger is activated, the second valve body receives positive pressure and is displaced to the second position against the biasing force of the tension spring to close the inlet. .

According to the third aspect of the present invention, even if the second valve body is urged in the direction of opening the introduction port by providing the tension spring, the second valve body is generated when positive pressure is generated in the vicinity of the intake air when the coil body is energized. Thus, the inlet can be closed.
Thus, the vapor component of the fuel does not flow back from the outlet to the inlet when the supercharger is operated, and the same effect as in the first aspect can be obtained.

(About claim 4)
The spring member is a compression spring. When the coil body is energized, the movable valve core displaces the first valve body to the first position and away from the second valve body, so that the second valve body is displaced to the first position by the urging force of the compression spring and the introduction port is Open. When positive pressure is generated in the vicinity of the intake air when the turbocharger is activated, the second valve body receives positive pressure and is displaced to the second position against the urging force of the compression spring to close the inlet. .

According to a fourth aspect of the present invention, even if the second valve body is urged in the direction to open the inlet by providing a compression spring, the inlet is closed by the second valve when a positive pressure is generated in the vicinity of the intake air. be able to.
Thus, the vapor component of the fuel does not flow back from the outlet to the inlet when the supercharger is operated, and the same effect as in the first aspect can be obtained.

(Claim 5)
When the coil body is not energized, the first valve body comes into contact with the second valve body via the first elastic body made of synthetic resin and presses the second valve body, and the second valve body is made of rubber or synthetic resin The inlet is closed by contacting the inlet through the second elastic body.
In claim 5, since the first elastic body made of synthetic resin and the second elastic body made of rubber or synthetic resin act as a sound absorbing material, the first valve body directly contacts the second valve body, Unlike the case where the two-valve body directly contacts the introduction port, the generation of contact noise can be reduced.

(About claim 6)
The movable iron core forms a bottomed cylindrical body having a lid portion and is provided so as to surround a columnar stopper disposed in the coil body. When the coil body is energized, the movement of the movable iron core is restricted by bringing the inner surface portion of the lid portion into contact with the tip surface of the stopper.
According to the sixth aspect of the present invention, the movable iron core forms a bottomed cylindrical body, and the simple structure in which the columnar stopper is provided in the coil body makes it possible to regulate the movement of the movable iron core, and the overall structure is compact without increasing in size. This is advantageous in terms of cost.

(About claim 7)
The 2nd valve body is formed as a bottom part of the housing which provided the slit in the surrounding wall part. When the coil body is not energized, the slit is shielded by the stationary member, and when the coil body is energized, the second valve body is displaced to the first position, so that the slit is released from the shielding state by the stationary member and communicates with the inside and outside of the peripheral wall portion. Let
In claim 7, the second valve body is displaced to the first position by a simple configuration such as forming the second valve body in a bowl shape, so that the slit is released from the shielding state, and the introduction port, the discharge port, Can be communicated, which is advantageous in terms of cost.

(A) is a longitudinal cross-sectional view of the valve device for canisters, (b) is an enlarged perspective view showing the first valve body and the second valve body in a partially broken view (Example 1). (A), (b) is a longitudinal cross-sectional view which shows the action | operation of the valve apparatus for canisters (Example 1). (Example 2) which is a longitudinal cross-sectional view of the valve apparatus for canisters. (A), (b), (c) is a longitudinal cross-sectional view which shows the action | operation of the valve apparatus for canisters (Example 3). (A) is a fractured front view of a canister valve device shown together with a fuel system of a fuel tank, a canister and an intake pipe, and (b) is an enlarged vertical sectional view of the canister valve device (conventional example). It is a typical schematic diagram showing a fuel system of an internal combustion engine in which a supercharger is incorporated (conventional example).

  In the canister valve device according to the present invention, a configuration in which the vapor component of the fuel is prevented from flowing backward during operation of the supercharger, the number of parts does not increase, and it is advantageous in terms of cost and suitable for mounting on a vehicle. Are embodied by each example.

[Configuration of Example 1]
1 and 2 show Embodiment 1 of the present invention. A canister valve device 1 in FIG. 1A is provided in a fuel supply system of an internal combustion engine (not shown) for a vehicle, and is connected to a canister 2 provided in the vehicle. The canister 2 is known as a charcoal canister, and a material element that receives and adsorbs the vapor component 4 in the fuel tank 3 is provided as activated carbon (not shown). The canister 2 and the fuel tank 3 are connected by a conduit 5 so that the gasoline vapor as the vapor component 4 in the fuel tank 3 is adsorbed on the activated carbon so as not to leak outside from the viewpoint of environmental conservation.

The valve body 6 of the canister valve device 1 has a sealed casing 6a, and performs a valve body opening / closing operation described later by duty ratio control. The casing 6a includes an introduction pipe 7 having an introduction port 7a and a lead-out pipe 8 having a lead-out port 8a. The introduction pipe 7 includes an outer pipe part 7b located outside the casing 6a and an inner pipe part 7c located as a stationary member inside the casing 6a. The outer pipe part 7b is connected to the canister 2 via the communication pipe 9. Has been.
The outlet pipe 8 is connected to an intake passage 10 of an engine (not shown) via a supply pipe 13. The intake passage 10 is provided with a throttle valve 11 for adjusting the flow rate so that the rotation of the throttle valve 11 about the support shaft 12 can be adjusted.

  In the casing 6a, a bobbin 15 having a coil body 14 that is coaxial with the inner tube portion 7c of the introduction tube 7 and is axially opposed is provided. The coil body 14 is connected to an engine control unit (not shown) via a terminal 14b of a connector 14a formed integrally with the casing 6a. A tubular fixed iron core 16 is disposed in the bobbin 15 so as to be coaxial with the bobbin 15. A columnar stopper 17 is provided in the fixed iron core 16 so as to be concentric with the inner peripheral surface of the fixed iron core 16 with a slight annular space 18 therebetween.

  The movable iron core 19 is disposed in the fixed iron core 16 so as to face the introduction port 7a. As shown in FIG. 1B, the movable iron core 19 is formed into a bottomed cylindrical body by a body 19b provided with a lid portion 19a at one end. Yes. The body 19 b is disposed in the annular space 18 so as to surround the stopper 17, and a first elastic body 21 made of synthetic resin that functions as the first valve body 20 is attached to the lid 19 a. The first elastic body 21 is, for example, a truncated cone-shaped rubber body. The large diameter portion 21a is opposed to the side where the introduction port 7a is present, and the small diameter portion 21b is opposed to the side where the distal end surface 17a of the stopper 17 is present. ing.

The movable iron core 19 is provided so as to be capable of reciprocating displacement along with the first valve body 20 along the axial direction S of the stopper 17, and the movable iron core 19 is moved by bringing the inner surface portion of the lid portion 19 a into contact with the distal end surface 17 a of the stopper 17. Be regulated. That is, the movement restriction of the movable iron core 19 is performed when the small diameter portion 21 b of the first elastic body 21 comes into contact with the tip surface 17 a of the stopper 17.
A compression coil spring Ps is provided as an elastic member between the body 19b and the fixed iron core 16, and the first valve body 20 is connected to a second valve body 22 described later via the first elastic body 21 by the compression coil spring Ps. It is biased in the abutting direction.

The 2nd valve body 22 functions as a bottom part of the housing 23 formed so that it might have the slit 23b in the surrounding wall part 23a. A second elastic body 24 made of synthetic resin is attached to the bottom surface of the housing 23 on the inner surface portion facing the introduction port 7a. The second elastic body 24 is a rubber plate, and has an outer diameter dimension slightly larger than the inner diameter of the introduction port 7a.
The peripheral wall portion 23a of the housing 23 is arranged to be concentric around the outer periphery of the inner tube portion 7c, and the second valve body 22 is located between the introduction port 7a and the first valve body 20.
As the second valve body 22 moves to a second position H2, which will be described later, the slit 23b of the housing 23 is displaced so as to be overlapped with the inner pipe portion 7c and shielded, so that the peripheral wall portion 23a communicates in and out. Is blocked.

  A compression coil spring 25 is provided as a spring member between the open end 23c of the housing 23 and the inner wall 6b of the casing 6a. The compression coil spring 25 urges the second valve portion 22 in a direction to leave the introduction port 7 a and open the introduction port 7 a via the second elastic body 24.

  The coil body 14 is controlled by duty ratio control based on pulse width modulation (PWM). The duty ratio control is performed by a concentration sensor (not shown) for detecting the vapor component 4 of the fuel in the canister 2 and the engine speed. It is performed by the engine control unit on the basis of the load state, the operating state or the running state of the vehicle. Hereinafter, the duty ratio control is referred to as control by energization / non-energization of the coil body 14 for convenience of explanation.

  Since no electromagnetic force is generated with respect to the movable iron core 19 when the coil body 14 is not energized, the movable iron core 19 receives the urging force of the compression coil spring Ps as shown in FIG. The second valve body 22 is pressed through the elastic body 21. Accordingly, the second valve body 22 closes the introduction port 7a via the second elastic body 24 against the urging force of the compression coil spring 25 (second position H2).

In an internal combustion engine having a supercharger (not shown) such as a supercharger or a turbocharger in a fuel supply system, every time the supercharger is operated, a lead-out pipe 8 close to the intake passage 10 and an intake vicinity portion of the supply pipe 13 A positive pressure is generated at 8A.
When the coil body 14 is not energized and the intake air vicinity portion 8A becomes positive pressure due to the operation of the supercharger, the positive pressure is applied to the casing via the supply pipe 13 and the outlet pipe 8 as indicated by an arrow K in FIG. In order to enter the inside of 6a, the second valve body 22 works so as to abut against the introduction port 7a via the second elastic body 24 against the urging force of the compression coil spring 25 and close the introduction port 7a. . For this reason, the closed state of the inlet 7a is maintained by the second valve body 22, and the communication from the outlet 8a to the inlet 7a is prevented.
The reason why the second valve body 22 works so as to close the inlet 7a is that the second valve body 22 is located outside the inner pipe portion 7c, and positive pressure is applied to the second valve body 22 from the outside of the inner pipe portion 7c. Because it works.

When the coil body 14 is energized, an electromagnetic force is generated with respect to the movable iron core 19, so that the movable iron core 19 is compressed while being assisted by the urging force of the compression coil spring 25 as indicated by an arrow Q in FIG. It is displaced so as to be sucked into the fixed iron core 16 against the urging force of the spring Ps.
Thereby, since the movable iron core 19 moves from the second position H2 to the first position H1, the first valve body 20 is separated from the second valve body 22, and the introduction port 7a is opened by the urging force of the compression coil spring 25. Communication from the inlet 7a to the outlet 8a is allowed.

As the second valve body 22 is displaced to the first position H1, the housing 23 also moves to the first position H1, so that the slit 23b of the peripheral wall portion 23a is released from the shielding position by the inner tube portion 7c. The inside and outside of the peripheral wall portion 23a are communicated.
At this time, if the urging forces of the compression coil spring Ps and the compression coil spring 25 at the first position H1 are Fc and Ft, and the electromagnetic force is Mf, the magnitude relationship of | Mf |> | Fc | − | Ft | .

When the turbocharger is not operated during the operation of the vehicle, the intake vicinity 8A of the supply pipe 13 has a negative pressure, and when the coil body 14 is energized, the introduction port 7a and the outlet port are opened as the introduction port 7a is opened. 8a communicates, and a certain pressure difference is generated between the introduction pipe 7 and the outlet pipe 8.
Therefore, as shown in FIG. 1A, the canister 2 is connected to the communication pipe 9, the introduction pipe 7, the introduction port 7a, the slit 23b of the housing 23, the casing 6a, the outlet port 8a, the outlet pipe 8 and the supply pipe 13. An intake system path W that reaches the intake path 10 is formed. The vapor component 4 of the fuel is supplied to the engine via the intake system passage W as shown by arrows J1 to J3 in FIG.

When the coil body 14 is energized when the intake air vicinity portion 8A is at a positive pressure during the operation of the supercharger, the second valve body 22 is moved as shown by arrows L1 to L3 in FIG. Positive pressure is received from the outside of the inner pipe portion 7c, and acts in the direction of closing the introduction port 7a.
For this reason, the second valve body 22 is displaced from the first position H1 to the second position H2 while resisting the urging force of the compression coil spring 25 to close the introduction port 7a, and from the introduction port 7a to the outlet port 8a. To prevent communication. At this time, if the positive pressure is P, the positive pressure P exceeds the urging force of the compression coil spring 25, and therefore the magnitude relationship of | P |> | Ft | is established.

[Effect of Example 1]
In the above configuration, when the supercharger is not operated, the intake vicinity 8A of the lead-out pipe 8 is at a negative pressure, and the introduction port 7a is properly connected by the second valve body 22 as the coil body 14 is energized and de-energized. Therefore, the vapor component 4 of the fuel corresponding to the opening ratio of the introduction port 7a can be supplied from the canister 2 to the intake passage 10 via the intake system passage W.
Further, when a positive pressure is generated in the intake vicinity 8A by operating the supercharger, the second valve body 22 receives a positive pressure in a direction to close the inlet 7a against the urging force of the compression coil spring 25. .
Therefore, when the coil body 14 is not energized, the closed state of the introduction port 7a is maintained by the second valve body 22, and when energized, the second valve body 22 is displaced so as to close the introduction port 7a, and from the outlet port 8a. The communication with the introduction port 7a is prevented and the vapor component 4 of the fuel is prevented from flowing backward from the outlet port 8a to the introduction port 7a.

As a result, there is no need to provide a check valve in the outlet pipe 8, and the pressure loss between the canister 2 and the intake passage 10 does not increase, and the fuel vapor component 4 is efficiently supplied from the canister 2 to the intake passage 10. be able to.
As the check valve becomes unnecessary, the total number of parts does not increase and the assembly process does not increase, which is advantageous in terms of cost and suitable for mass production as a vehicle mounting.

In general, in the configuration in which the first valve body 20 directly contacts the second valve body 22 or the second valve body 22 directly contacts the introduction port 7a, a contact sound is generated when the two contact each other. .
In this regard, the first elastic body 21 and the second elastic body 24 made of synthetic resin according to the first embodiment function as a sound absorbing material, and the first valve body 20 contacts the second valve body 22 via the first elastic body 21. Since the second valve body 22 contacts the introduction port 7a via the second elastic body 24, the generation of contact noise can be reduced.

With a simple configuration in which the movable iron core 19 forms a bottomed cylindrical body and the columnar stopper 17 is provided in the coil body 14 via the fixed iron core 16, the movement of the movable iron core 19 can be restricted, and the entire structure However, it is compact and advantageous in terms of cost.
Since the lid 19a of the movable iron core 19 has the first elastic body 21 attached as the first valve body 20, the inner surface of the lid 19a is connected to the stopper 17 via the small diameter portion 21b of the first elastic body 21. It abuts on the tip surface 17a. For this reason, unlike the case where the lid portion 19a directly abuts against the stopper 17, the generation of the abutting sound can be reduced.
In addition, with a simple configuration in which the second valve body 22 is formed in a bowl shape, the slit 23b is released from the shielding position along with the displacement of the second valve body 22 to the first position H1, and the introduction port 7a and The outlet 8a can be communicated with each other, which is advantageous in terms of cost.

[Configuration of Example 2]
FIG. 3 shows a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that a tension coil spring 30 is provided as a spring member in place of the compression coil spring 25 of the first embodiment.
The tension coil spring 30 is provided between the open end 23c of the housing 23 and the upper end surface 16c of the fixed iron core 16, and biases the second valve body 22 in the direction in which the introduction port 7a is opened. It works in the same direction as the urging force of the spring Ps.

  Therefore, when the coil body 14 is not energized, the movable iron core 19 presses the second valve body 22 against the urging force of the tension coil spring 30 by the urging force of the compression coil spring Ps to close the introduction port 7a. When the urging force of the compression coil spring Ps is Fn and the urging force of the tension coil spring 30 is Fm, the magnitude relationship of | Fn |> | Fm | is established.

When the coil body 14 is energized, the movable valve core 19 displaces the first valve body 20 from the second position H2 to the first position H1 and moves away from the second valve body 22, so that the second valve body 22 is connected to the tension coil spring 30. The inlet 7a is opened by being displaced to the first position H1 by the urging force.
When positive pressure is generated in the intake vicinity 8A during operation of the supercharger, the second valve body 22 receives positive pressure and is displaced to the second position H2 against the urging force of the tension coil spring 30. The inlet 7a is closed. Assuming that the electromagnetic force at this time is Mf, the magnitude relationship of | Mf |> | Fn | − | Fm | is established. That is, the value of the electromagnetic force Mf may be a magnitude corresponding to the difference between the urging forces of the compression coil spring Ps and the tension coil spring 30.

In the second embodiment, even if the second valve body 22 is urged in the direction in which the tension coil spring 30 is provided and the introduction port 7a is opened, when the coil body 14 is energized, positive pressure is generated in the intake vicinity 8A. In addition, the introduction port 7 a can be closed by the second valve body 22. Incidentally, if the positive pressure is P, the magnitude relationship of | P |> | Fm | is established.
As a result, the fuel vapor component 4 does not flow backward from the outlet 8a to the inlet 7a when the supercharger is operated, and the same effect as in the first embodiment can be obtained.

[Configuration of Example 3]
FIG. 4 shows a third embodiment of the present invention. The third embodiment is different from the first embodiment in that the coil body 14 is not energized between the first valve body 20 and the second valve body 22, that is, outside the first elastic body 21 and the second valve body 22. That is, a slight gap G is secured between the surface and the surface.

In the third embodiment, when a positive pressure is generated in the intake vicinity 8A due to the operation of the turbocharger when the coil body 14 is not energized, a gap G exists between the first valve body 20 and the second valve body 22. As shown in FIG. 4A, the positive pressure acts on the entire surface of the outer surface of the second valve body 22, and the second valve body 22 is displaced in response to the positive pressure, so that the biasing force of the compression coil spring 25 is increased. Accordingly, the introduction port 7a is closed.
When the supercharger is not operating when the coil body 14 is energized, the second valve body 22 is displaced from the second position H2 to the first position H1 as in the first embodiment. Accordingly, the first valve body 20 is displaced to the first position H1 by the urging force of the compression coil spring 25 to open the introduction port 7a, so that the vapor component 4 of the fuel is shown by arrows T1 to T1 in FIG. As indicated by T3, the air is supplied to the intake passage 10 along the intake system passage W.

When positive pressure is generated in the intake vicinity 8A due to the operation of the turbocharger when the coil body 14 is energized, as shown by arrows U1 to U3 in FIG. As in the first embodiment, the inlet 7a is closed by displacing from the first position H1 to the second position H2 while resisting the urging force of the compression coil spring 25.
Even in the third embodiment in which the gap G is provided between the first valve body 20 and the second valve body 22, the same effects as those of the first embodiment can be obtained.

[Modification]
(A) In the first embodiment, when the coil body 14 is not energized, the first valve body 20 is brought into contact with the second valve body 22 via the first elastic body 21, but the spring constant of the compression coil spring Ps is used. The first valve body 20 exerts a pressing force on the second valve body 22 via the first elastic body 21 by the compression coil spring Ps, and the second valve body 22 strongly closes the introduction port 7a. May be.

(B) In the first embodiment, when the introduction port 7a is opened by the second valve body 22, the housing 23 is provided with the slits 23b that allow the inside and outside of the peripheral wall portion 23a to communicate with each other. A shaft groove may be provided so that the introduction port 7a communicates with the inside of the casing 6a via the shaft groove.

(C) About the 2nd elastic body 24 of Example 1, it attached to the inner surface part which faces the inlet 7a of the 2nd valve body 22, but the outer surface opposite to the inlet 7a of the 2nd valve body 22 You may attach so that it may also extend to a part.
(D) Although the first elastic body 21 is a rubber body and the second elastic body 24 is a rubber plate, the first elastic body 21 and the second elastic body 24 are not limited to rubber bodies, but may be polyethylene (PE), polypropylene ( It may be an engineering plastic (synthetic resin) such as PP), polycarbonate (PC), polybutylene terephthalate (PBTF), or polyproethylene (PPE).

  In the canister valve device of the present invention, when a positive pressure is generated in the vicinity of the intake air when the supercharger is activated, the second valve body always receives a positive pressure in the direction in which the inlet is closed. When the coil body is not energized, the closed state of the inlet is maintained by the second valve body, and when energized, the second valve body is displaced so as to close the inlet, and the fuel vapor component flows backward from the outlet to the inlet. To prevent. As the check valve becomes unnecessary, the total number of parts does not increase, the assembly process does not increase, and it is advantageous in terms of cost, and mounting on a vehicle is improved. For this reason, the demand of a vehicle-related business can be stimulated and applied to the machine industry through parts distribution.

DESCRIPTION OF SYMBOLS 1 Canister valve apparatus 2 Canister 3 Fuel tank 4 Fuel vapor | steam component 5 Conduit 6 Valve body 6a Casing 7 Introducing pipe 7a Introducing port 7c Inner pipe part (stationary member) of introducing port
DESCRIPTION OF SYMBOLS 8 Outlet pipe 8A Intake vicinity part 8a Outlet port 10 Intake path 14 Coil body 16 Fixed iron core 17 Stopper 17a Tip surface 19 Movable core 19a Lid 20 First valve body 21 First elastic body 22 Second valve body 23 Housing 23a Circumferential wall Part 23b Slit 24 Second elastic body 25 Compression coil spring (spring member, compression spring)
30 Tension coil spring (spring member, tension spring)
Ps compression coil spring (elastic member)
H1 1st position H2 2nd position

Claims (7)

Connected to a canister having a material element for receiving and adsorbing a vapor component from a fuel tank, a supercharger was provided from an inlet for introducing the vapor component from the canister and an outlet pipe for the vapor component In a canister valve device comprising a valve body having a lead-out port that leads to an intake passage of an engine,
The valve body is
A coil body disposed in the casing;
A first valve body that is movable to reciprocally displace the first valve body between a first position and a second position in a direction away from the introduction port with energization and non-energization of the coil body Iron core,
Provided between the first valve body and the introduction port, is displaced in a direction to open and close the introduction port in conjunction with the movable iron core, and is always urged to open the introduction port by a spring member. When positive pressure is generated in the vicinity of the intake air close to the intake passage in the outlet pipe during operation of the supercharger, the positive pressure is received to resist the biasing force of the spring member. A canister valve device comprising: a second valve body for closing the introduction port. When the coil body is not energized, the movable iron core is urged in the direction of the introduction port, and the first valve body presses the second valve body against the urging force of the spring member. An elastic member that closes the inlet by the second valve body at two positions and prevents communication from the inlet to the outlet;
When the coil body is energized, the movable iron core displaces the first valve body to the first position to open the introduction port, and allows communication from the introduction port to the outlet port; When a positive pressure is generated in the vicinity of the intake during the operation of the supercharger, the second valve body receives the positive pressure and is displaced to the second position against the biasing force of the spring member. The canister valve device according to claim 1, wherein the inlet is closed.   The canister valve device according to claim 1, wherein the spring member is a tension spring.   The canister valve device according to claim 1, wherein the spring member is a compression spring.   When the coil body is not energized, the first valve body abuts against the second valve body via the first elastic body made of synthetic resin to press the second valve body, and the second valve body is rubber. 3. The canister valve device according to claim 2, wherein the inlet is closed by contacting the inlet through a second elastic body made of plastic or synthetic resin.   The movable iron core forms a bottomed cylindrical body having a lid, and is provided so as to surround a columnar stopper disposed in the coil body.When the coil body is energized, the movable iron core is The canister valve device according to claim 2, wherein the movement is restricted by bringing the inner surface portion of the lid portion into contact with the front end surface of the stopper.   The second valve body is formed as a bottom portion of a housing having a slit in a peripheral wall portion, the slit is shielded by a stationary member when the coil body is not energized, and the second valve body is energized when the coil body is energized. 3. The canister valve device according to claim 2, wherein the slit is released from the shielded state by the stationary member and the inside and outside of the peripheral wall portion communicate with each other by being displaced to the first position.

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