JP7306238B2 - Purge control valve device - Google Patents

Description

The disclosure herein relates to a purge control valve arrangement.

Patent Literature 1 discloses a purge control valve device having two housings each containing one solenoid valve. The purge control valve device of Patent Document 1 includes two housings containing solenoid valves and two seat valve members each having a valve seat on which each solenoid valve is seated.

Japanese Patent No. 5717876

The device of Patent Document 1 includes two housings each containing an electromagnetic valve, and two seat valve members. Therefore, there is a problem that the number of parts is large.

One of the objects disclosed in this specification is to provide a purge control valve device capable of reducing the number of parts.

The multiple aspects disclosed in this specification employ different technical means to achieve their respective objectives. In addition, the symbols in parentheses described in the claims and this section are an example showing the correspondence relationship with the specific means described in the embodiment described later as one aspect, and limit the technical scope isn't it.

One of the disclosed purge control valve devices includes an inflow port (31a) into which vaporized fuel flowing out from the canister (13) flows, an outflow port (32a) into which the vaporized fuel flows out toward the engine (2), A first internal passage (43a) and a second internal passage (43b), which are part of the internal passage connecting the inflow port and the outflow port, and a first valve body (42a) capable of opening and closing the first internal passage. A first solenoid portion (37) for generating an electromagnetic force for displacement; a second solenoid portion (38) for generating an electromagnetic force for displacing a second valve body (42b) capable of opening and closing the second internal passage; A solenoid housing (31) in which both a solenoid part and a second solenoid part are resin-molded and built in, a first valve seat (332a) on which a first valve body is seated, and a second valve seat on which a second valve body is seated. (332b) is integrally formed and is provided with a resin seat valve member (33) that is welded or bonded to the solenoid housing.
The seat valve member includes a first cylindrical portion (331a) having a first valve seat at its end and having a first internal passage inside, and a second valve seat at its end and having a second internal passage inside. and a plate-like portion (333) formed integrally with the first and second cylindrical portions protruding in the thickness direction.
The seat valve member and the solenoid housing have a peripheral coupling portion (317b1) that surrounds the peripheries of the first tubular portion and the second tubular portion and is joined by welding or adhesion.

This device includes a solenoid housing in which two solenoid portions are resin-molded, and a seat valve member in which two valve seats are integrally formed and joined to the solenoid housing by welding or adhesion. According to this purge control valve device, the two electromagnetic valves and the two valve seats can be composed of two members. As described above, the purge control valve device can reduce the number of parts. Furthermore, the purge control valve device can reduce the area of the joint portion by welding or adhesion, compared to the case where the member having the first valve seat and the member having the second valve body are provided.

1 is a configuration diagram of an evaporative fuel processing device provided with the purge control valve device of the first embodiment; FIG. It is a partial sectional view of the purge control valve device which looked at the 3rd to-be-attached part from the front. FIG. 4 is a rear view of the purge control valve device; It is the side view of the purge control valve apparatus which looked the 2nd to-be-attached part from the front. It is the side view of the purge control valve apparatus which looked at the 1st to-be-attached part from the front. FIG. 3 is an external view of the purge control valve device viewed from the inflow side housing; FIG. 4 is an external view of the purge control valve device viewed from the outflow housing side; It is a schematic diagram showing the positional relationship of two electromagnetic valves, an inflow port, and an outflow port. FIG. 5 is a cross-sectional view along the IX-IX cross section of FIG. 4; FIG. 5 is a cross-sectional view taken along line XX of FIG. 4; FIG. 5 is a partial cross-sectional view of the joint between the housing and the seat valve member; It is a figure which shows the joint part in an inflow side housing. It is a figure which shows the joint part in a seat-valve member. It is a figure which shows the joint part in a seat-valve member.

A plurality of modes for carrying out the present disclosure will be described below with reference to the drawings. In each form, the same reference numerals may be given to the parts corresponding to the matters described in the preceding form, and overlapping explanations may be omitted. When only a part of the configuration is described in each form, the previously described other forms can be applied to other parts of the configuration. Not only combinations of parts that are explicitly stated that combinations are possible in each embodiment, but also partial combinations of embodiments even if they are not explicitly stated unless there is a particular problem with the combination. is also possible.

<First embodiment>
A first embodiment will be described with reference to FIGS. 1 to 14. FIG. A purge control valve device is used in an evaporative fuel processing device 1, which is an evaporative fuel purge system mounted on a vehicle. The purge valve 3 is an example of a purge control valve device. As shown in FIG. 1, the evaporated fuel processing device 1 supplies the HC gas and the like in the fuel adsorbed in the canister 13 to the intake passage of the engine 2. As shown in FIG. As a result, it is possible to prevent the vaporized fuel from the fuel tank 10 from being released into the atmosphere. The evaporative fuel processing device 1 includes an intake system of the engine 2 that constitutes an intake passage of the engine 2 that is an internal combustion engine, and an evaporative fuel purge system that supplies the evaporative fuel to the intake system of the engine 2 .

Evaporated fuel introduced into the intake passage by the intake pressure of the engine 2 is mixed with combustion fuel supplied to the engine 2 from an injector or the like, and combusted in the combustion chamber of the engine 2 . The engine 2 mixes and combusts at least the evaporated fuel desorbed from the canister 13 and the combustion fuel. In the intake system of the engine 2 , an intake pipe 21 forming an intake passage is connected to an intake manifold 20 . This intake system further comprises a throttle valve 25, an air filter 24, etc., which are provided in the middle of the intake pipe 21. As shown in FIG.

In the evaporated fuel purge system, the fuel tank 10 and the canister 13 are connected by a pipe 11 forming a vapor passage. In the vaporized fuel purge system, the canister 13 and the intake pipe 21 are connected via the pipe 14 and the purge valve 3 that form a purge passage. Also, a purge pump may be provided in the middle of the purge passage. The air filter 24 is provided upstream of the intake pipe 21 and traps dust, dirt, and the like in the intake air. The throttle valve 25 is an intake air amount control valve that adjusts the amount of intake air flowing into the intake manifold 20 by adjusting the opening of the inlet of the intake manifold 20 . The intake air passes through the intake passage and flows into the intake manifold 20, is mixed with combustion fuel injected from an injector or the like so as to have a predetermined air-fuel ratio, and is combusted in the combustion chamber.

The fuel tank 10 is a container that stores fuel such as gasoline. A fuel tank 10 is connected to an inflow portion of a canister 13 by a pipe 11 forming a vapor passage. The canister 13 is a container in which an adsorbent such as activated carbon is enclosed. The canister 13 takes in vaporized fuel generated in the fuel tank 10 through the vapor passage and temporarily adsorbs it on the adsorbent.

The canister 13 is integrally provided with the valve module 12 or provided via a duct portion. Valve module 12 includes a canister close valve and an internal pump. The canister close valve opens and closes the intake for intake of outside fresh air. An internal pump is a pump that can expel gas to or draw air into the atmosphere. The canister 13 is provided with a canister close valve, so that atmospheric pressure can be applied inside the canister 13 . The canister 13 can easily desorb the vaporized fuel adsorbed on the adsorbent by sucked fresh air, that is, it can be purged.

The purge valve 3 is a purge control valve device having a valve body for opening and closing an internal passage that is part of the purge passage. The purge control valve device has a plurality of solenoid valves inside. Purge valve 3 can permit and prevent vaporized fuel from canister 13 from being supplied to engine 2 . A configuration of the purge valve 3 will be described. The purge valve 3 has an electromagnetic valve that opens and closes each of a plurality of internal passages provided inside the housing. The purge valve 3 has one inflow port 31a and one outflow port 32a. The inflow port 31 a communicates with the canister 13 via the connected pipe 14 . The inflow port 31a has an inflow passage 31a1 into which the evaporated fuel flowing out of the canister 13 flows. The outflow port 32a communicates with the intake pipe 21 via a connected pipe. The outflow port 32 a has an outflow passage 32 a 1 through which the evaporated fuel flows out toward the engine 2 . The interior of the purge valve 3 is provided with two internal passages branched downstream of the inflow port 31a. Further downstream, these two internal passages are combined into an outflow port 32a. Each of the two internal passages is a passage that is individually opened and closed by a solenoid valve.

When the control device opens the purge valve 3 while the vehicle is running, a difference is generated between the negative pressure in the intake manifold 20 generated by the intake action of the piston and the atmospheric pressure applied to the canister 13 . Due to this pressure difference, the vapor fuel adsorbed in the canister 13 flows through the purge passage and the purge valve 3 and is sucked into the intake manifold 20 through the intake pipe 21 .

The vaporized fuel sucked into the intake manifold 20 is mixed with the original combustion fuel supplied to the engine 2 from an injector or the like, and combusted in the cylinders of the engine 2 . In the cylinders of the engine 2, the air-fuel ratio, which is the mixture ratio of the fuel for combustion and the intake air, is controlled to a predetermined air-fuel ratio. The controller controls the duty energization of the purge valve 3 to adjust the purge amount of the vaporized fuel so that a predetermined air-fuel ratio is maintained even if the vaporized fuel is purged.

As shown in FIGS. 2, 8 and 10, the purge valve 3 incorporates a first solenoid valve 37 and a second solenoid valve 38 as an example of a plurality of solenoid valves. Each of the first solenoid valve 37 and the second solenoid valve 38 is composed of similar components. Each of the first electromagnetic valve 37 and the second electromagnetic valve 38 has a solenoid portion 41 , a valve body 42 and a tubular portion 331 . The first solenoid valve 37 includes a first valve body 42a and a first solenoid portion that generates an electromagnetic force that displaces the first valve body 42a. The first valve body 42 a can open and close the first internal passage 43 a that communicates with the interior of one cylindrical portion 331 . The second solenoid valve 38 includes a second valve body 42b and a second solenoid portion that generates an electromagnetic force that displaces the second valve body 42b. The second valve body 42b can open and close the second internal passage 43b that communicates with the other tubular portion 331 . A valve seat 332 is provided at the end of the cylindrical portion 331 so that the valve body is seated in the closed state and separated from the valve body in the open state. The first solenoid valve 37 and the second solenoid valve 38 are, for example, normally closed valves that are controlled to a closed state in which the internal passage is closed when voltage is not applied and to an open state in which the internal passage is opened when voltage is applied.

The solenoid portion 41 of each solenoid valve includes a coil portion 410, a bobbin 411, a fixed core 413, a movable core 412, a shaft member 415, a spring 414 and the like. The solenoid portion 41 is covered with a covering portion made of a resin material. The covering portion is formed integrally with the housing. It can be said that the solenoid part 41 is resin-molded by the covering part. The first solenoid portion and the second solenoid portion are resin-molded and housed in the inflow side housing 31 . The inflow side housing 31 is an example of a solenoid housing containing a solenoid portion. The central axis of the solenoid portion 41 is also the central axis of the solenoid valve. Since the solenoid portion 41 has a higher specific gravity than the housing, the solenoid portion is likely to vibrate due to external force.

The movable core 412 is made of a material that allows magnetism to pass through, such as a magnetic material. A cylindrical movable core 412 surrounds a shaft member 415 and a spring 414 inserted from the open end. The valve body 42 is made of an elastically deformable material such as rubber. The valve body 42 is attached to the movable core 412 so that the head portion of the movable core 412 is sandwiched between the base portion and the valve portion, and is integrated with the movable core 412 .

The fixed core 413 slidably supports the movable core 412 that moves in the axial direction against the biasing force of the spring 414 by electromagnetic force. The spring 414 is in contact with the shaft member 415 fixed to the fixed core 413 at one end in the axial direction and with the other end in the axial direction in contact with the head of the movable core 412 . located inside. Therefore, spring 414 provides a biasing force that tends to move movable core 412 toward valve seat 332 . The fixed core 413 fixes the shaft member 415 and is attached to the bobbin 411 . The fixed core 413, the shaft member 415, the movable core 412, and the valve body 42 are installed so that their axes are coaxial. The shaft member 415 is made of, for example, nylon reinforced with glass fiber. The fixed core 413 and the movable core 412 are made of a magnetic material. The fixed core 413 is made of, for example, carbon steel wire for cold heading. Each electromagnetic valve opens and closes the internal passage 43 by driving the valve body 42 in accordance with the balance between the electromagnetic force generated when the coil portion 410 is energized and the biasing force of the spring 414 .

The housing is provided with a connector 31c extending from the solenoid portion 41 side of the first electromagnetic valve 37 in a direction orthogonal to the central axis of the solenoid portion 41 . The housing is provided with a connector 31 d extending from the solenoid portion 41 side of the second electromagnetic valve 38 in a direction orthogonal to the central axis of the solenoid portion 41 . Each connector incorporates a terminal for energizing the coil portion 410 . The connector is a resin-molded part that supports terminals projecting from the inside of the housing through the bottom to the outside. The terminal is an energizing terminal electrically connected to the coil portion 410 . A power supply side connector for supplying power from a power supply unit or a current control device is connected to the connector. When the connector and the power supply side connector are connected and the terminal is electrically connected to a current control device or the like, the purge valve 3 can control the current that flows through the coil portion 410 .

As shown in FIGS. 2 to 10, the purge valve 3 includes an inflow side housing 31, an outflow side housing 32, and a seat valve member 33 as housings. The inflow side housing 31, the outflow side housing 32, and the seat valve member 33 are made of a resin material. The inflow-side housing 31 includes an inflow port 31a into which evaporated fuel from the canister 13 flows, and an inflow-side chamber 31b provided downstream of the inflow port 31a. The inflow-side housing 31 is provided with a flange portion 31f. The inflow-side housing 31 and the outflow-side housing 32 are integrally joined together by overlapping the flange portions thereof while holding the outer peripheral edge of the seat valve member 33 therebetween. The flange portion 31 f of the inflow-side housing 31 is a portion radially protruding from the outer peripheral edge of the downstream opening located at the downstream end of the inflow-side housing 31 . As shown in FIG. 11, the flange portion 31f is joined to the flange portion 32f of the outflow-side housing 32 by welding or adhesion.

The inflow port 31 a is a tubular portion having an inflow passage for fluid therein, and is located at the upstream end of the inflow side housing 31 . The inflow port 31 a is connected to a pipe 14 forming a purge passage in the evaporated fuel processing device 1 and communicates with the canister 13 via the pipe 14 .

The inflow-side chamber 31b communicates at its upstream end with an inflow passage 31a1 having a passage cross-sectional area smaller than that of the inflow-side chamber 31b. The inflow passage 31a1 and the inflow side chamber 31b are arranged side by side in the inflow direction of the fluid in the inflow passage 31a1. A downstream end of the inflow passage 31a1 is a chamber inflow portion 31a2 facing the inflow side chamber 31b. As shown in FIG. 9, the upstream end of the first internal passage 43a is located in the inflow direction of the fuel vapor flowing down the inflow passage 31a1 from the chamber inflow portion 31a2. The inflow direction is the direction along the axial direction of the inflow port 31a. The inflow-side chamber 31b communicates with the first internal passage 43a and the second internal passage 43b downstream of the inflow-side chamber 31b. The passage cross-sectional area in the inflow port 31a is the cross-sectional area when the inflow port 31a is cut by a plane perpendicular to the central axis of the passage. The passage cross-sectional area of the inflow-side chamber 31b is the cross-sectional area when the inflow-side chamber 31b is cut by a plane perpendicular to the central axis of the passage formed by the inflow-side chamber 31b. The passage in the purge valve 3 is designed such that the cross-sectional area of the passage increases sharply when proceeding from the passage in the inflow port 31a to the inflow side chamber 31b. The inflow side chamber 31 b provides a chamber volume for suppressing pulsation generated in the purge valve 3 .

The inflow side housing 31 includes a first side wall 311 , a second side wall 312 , a third side wall 313 and a fourth side wall 314 . The inflow-side housing 31 has a connecting wall portion that connects these side walls facing the downstream opening. As shown in FIG. 6, the connecting wall portion is a wall portion that covers axial ends of the first solenoid valve 37 and the second solenoid valve 38 and the inflow side chamber 31b. The inflow port 31a is located closer to the outflow side housing 32 than the connecting wall portion. The inflow port 31a is positioned inside the connecting wall without protruding outward. The inflow port 31 a extends along the connecting wall portion, the third side wall 313 and the fourth side wall 314 . The inflow port 31a is provided so that the height dimension from the flange portion 31f is lower than the connecting wall portion.

The first side wall 311 and the second side wall 312 face each other. The third side wall 313 and the fourth side wall 314 face each other. The first side wall 311 adjoins and connects the third side wall 313 and the fourth side wall 314 . A second side wall 312 adjoins and connects a third side wall 313 and a fourth side wall 314 . Connectors 31 c and 31 d extend outward from third side wall 313 .

The inflow side housing 31 accommodates a first solenoid valve 37 and a second solenoid valve 38 . As shown in FIG. 6 , the first solenoid valve 37 and the second solenoid valve 38 are arranged side by side on one side near the third side wall 313 inside the inflow side housing 31 . The first solenoid valve 37 and the second solenoid valve 38 are arranged along the third side wall 313 . The first electromagnetic valve 37 is arranged adjacent to both the first side wall 311 and the third side wall 313 . The second solenoid valve 38 is arranged adjacent to both the second side wall 312 and the third side wall 313 . The inflow port 31 a and the inflow side chamber 31 b are arranged in the inflow side housing 31 on the other side opposite to the first solenoid valve 37 and the second solenoid valve 38 . The inflow port 31a and the inflow side chamber 31b are arranged so as to line up in the direction in which the first solenoid valve 37 and the second solenoid valve 38 are arranged. The inflow side chamber 31 b is formed between the fourth side wall 314 and the first solenoid valve 37 and the second solenoid valve 38 .

The seat valve member 33 has two tubular portions 331 . Each of the two cylindrical portions 331 has a shape protruding from both sides of the plate-like portion 333 . The tubular portion 331 has an upstream protruding portion that protrudes toward the upstream side or the valve element side, and a downstream protruding portion that protrudes toward the downstream side or the outflow port 32a side. A flange portion 33f positioned on the outer peripheral edge of the plate-like portion 333 is a portion sandwiched between the inflow side housing 31 and the outflow side housing 32 as shown in FIG. The plate-like portion 333 of the seat valve member 33 is a partition wall portion that separates the inflow side housing 31 side and the outflow side housing 32 side in the purge valve 3 . The two tubular portions 331 are a first tubular portion 331a located on the first electromagnetic valve 37 side and a second tubular portion 331b located on the second electromagnetic valve 38 side.

The first cylindrical portion 331a has an internal first internal passage 43a and a first valve seat 332a formed at the tip. The first valve body 42a is seated on the first valve seat 332a when the valve is closed. The second cylindrical portion 331b has a second internal passage 43b inside and a second valve seat 332b formed at the tip. The second valve body 42b is seated on the second valve seat 332b when the valve is closed. These two valve seats 332 are located inside the inflow side housing 31 . A downstream end 331 a 1 of the first tubular portion 331 a and a downstream end 331 b 1 of the second tubular portion 331 b are located inside the outflow housing 32 .

As shown in FIG. 9, the upstream end of the second internal passage 43b is located on the side opposite to the fluid inflow direction of the inflow passage 31a1 with respect to the chamber inflow portion 31a2. The upstream end of the second internal passage 43b is located on the side opposite to the side where the first internal passage 43a is located with respect to the chamber inflow portion 31a2 with respect to the inflow direction of the fluid.

The first internal passage 43a is a passage having a larger fluid flow rate than the second internal passage 43b. The internal passage of the housing includes a large-flow-side passage through which evaporated fuel flows down to the first internal passage 43a and a small-flow-side passage through which the evaporated fuel flows down to the second internal passage 43b. The high-flow-side flow path is a flow path through which vaporized fuel flows down in order of the inflow passage 31a1, the inflow-side chamber 31b, the first communication passage 315, and the first internal passage 43a. The low-flow-side flow path is a flow path through which evaporated fuel flows down in order of the inflow passage 31a1, the inflow-side chamber 31b, the second communication passage 316, and the second internal passage 43b. The inflow side chamber 31b is a passage common to the large flow side channel and the small flow side channel. Evaporative fuel is split from the inflow-side chamber 31b into a flow path that flows down into the first internal passage 43a and a flow path that flows down into the second internal passage 43b.

The first communication passage 315 is a passage that connects the first internal passage 43a and the inflow side chamber 31b upstream of the first internal passage 43a. The first communication passage 315 is a passage provided closer to the inflow passage 31a1 than the first solenoid portion. A filter member 44 having a filter material portion or a mesh portion supported by the filter frame portion 44a is installed in the first communication passage 315 . The filter member 44 of the first communication passage 315 collects foreign matter contained in the evaporated fuel before it branches from the inflow side chamber 31b and flows down to the first internal passage 43a.

The second communication passage 316 is a passage that connects the second internal passage 43b and the inflow side chamber 31b upstream of the second internal passage 43b. The second communication passage 316 is a passage provided closer to the inflow passage 31a1 than the second solenoid portion. The second communication passage 316 is formed to have a passage cross-sectional area smaller than that of the first communication passage 315 and the inflow side chamber 31b. With this configuration, the fuel vapor flows down from the wide passage to the narrow passage when flowing into the second communication passage 316 from the inflow-side chamber 31b, resulting in a large pressure loss. As a result, the pressure loss in the flow passage leading to the second internal passage 43b having a small flow rate can be further increased. Therefore, the purge valve 3 can widen the flow rate range of the small flow rate range. A filter member 44 having a filter material portion or a mesh portion supported by the filter frame portion 44a is installed in the second communication passage 316 . The filter member 44 of the second communication passage 316 collects foreign matter contained in the evaporated fuel before it branches from the inflow side chamber 31b and flows down to the second internal passage 43b.

As shown in FIGS. 9 and 10, the first internal passage 43a and the second internal passage 43b are located on one side in the direction perpendicular to the inflow direction of the fluid. The inflow passage 31a1 is located on the other side of the housing in the orthogonal direction. The orthogonal direction is a direction orthogonal to both the connecting direction of the inflow-side housing 31 and the outflow-side housing 32 and the inflow direction. The coupling direction is also the stacking direction of the inflow side housing 31 and the outflow side housing 32 . According to this configuration, the large flow passage from the inflow passage 31a1 to the first internal passage 43a via the inflow chamber 31b can extend in the direction perpendicular to the inflow direction. As a result, the chamber inlet portion 31a2 and the first internal passage 43a can be arranged diagonally in the housing. Therefore, it is possible to set the large-flow-side flow path to be long, and to provide a flow path that further suppresses pressure loss.

The outflow port 32a is located between the inflow port 31a and the first internal passage 43a and the second internal passage 43b in the orthogonal direction. According to this configuration, the vaporized fuel can flow down a long flow path extending in the orthogonal direction from the inflow side chamber 31b to the first internal passage 43a and the second internal passage 43b. Since the channel resistance in the large flow side channel and the small flow side channel can be suppressed by configuring the channel in the orthogonal direction to be long, it is possible to contribute to ensuring the flow rate. The downstream end of the first internal passage 43a is located closer to the upstream end of the outflow passage 32a1 than the downstream end of the second internal passage 43b. With this configuration, even in the flow path on the outflow passage 32a1 side, the flow path resistance of the large flow side flow path can be suppressed more than the flow path resistance of the small flow side flow path. Therefore, it can contribute to securing a large flow rate in the purge valve 3 .

The purge valve 3 has a structure such that the pressure loss is concentrated in the small flow rate side passage from the inflow passage 31a1 to the internal passage whose opening degree is adjusted by each valve element. The purge valve 3 provides a flow path configuration in which the flow path on the large flow side does not bend in the opposite direction or pass through an extremely narrow flow path. The purge valve 3 provides a flow path configuration in which flow path resistance is greater than that of the high flow side flow path by having a reverse flow path for the low flow side flow path.

As shown in FIG. 10 , the outflow-side housing 32 surrounds downstream protrusions protruding from the plate-like portion 333 of the seat valve member 33 in the two cylindrical portions 331 . The first tubular portion 331a and the second tubular portion 331b are shaped to extend along each other. The downstream projecting portion of the first cylindrical portion 331a is longer than the downstream projecting portion of the second cylindrical portion 331b. The first tubular portion 331a is configured such that the axial length from the valve seat to the downstream end portion 331a1 is longer than that of the second tubular portion 331b. The downstream end portion 331a1 is positioned further away from the plate-like portion 333 of the seat valve member 33 than the downstream end portion 331b1. The first tubular portion 331a forms an internal passage that is longer than the second tubular portion 331b. Therefore, the first tubular portion 331a having a larger flow rate is longer than the second tubular portion 331b. This configuration is advantageous in ensuring the flow rate under the condition that the negative pressure on the engine 2 side is low, and it is more efficient to lengthen the first cylindrical portion 331a. On the other hand, even if the second tubular portion 331b is lengthened, the effect of securing the flow rate is low. Therefore, by shortening the second tubular portion 331b, the size of the housing can be reduced at that portion, and the amount of material forming the second tubular portion 331b can be reduced.

The outflow-side housing 32 includes an outflow port 32a through which evaporated fuel flows out toward the intake pipe 21, and an outflow-side chamber 32b provided upstream of the outflow port 32a. The flange portion 32 f of the outflow-side housing 32 is a portion radially protruding from the outer peripheral edge of the upstream opening located at the upstream end of the outflow-side housing 32 . The outflow chamber 32b communicates at its downstream end with an outflow passage 32a1 in the outflow port 32a having a passage cross-sectional area smaller than that of the outflow chamber 32b. The outflow side chamber 32b communicates the outflow port 32a with the first internal passage 43a and the second internal passage 43b inside the housing.

The outflow port 32 a is a tubular portion having an outflow passage for fluid therein, and is located at the downstream end of the outflow housing 32 . The outflow port 32a communicates with the intake pipe 21 via a connected pipe. The outflow port 32 a is preferably positioned closer to the inflow side housing 31 than the outermost wall forming the outflow side housing 32 . The outflow port 32a is positioned inside the outermost wall without protruding outward. The outflow ports 32a are arranged so as to line up in the direction in which the first solenoid valve 37 and the second solenoid valve 38 are arranged. The outflow port 32a extends toward the tip along the same direction as the inflow port 31a. The outflow port 32a is provided so that the height dimension from the flange portion 32f is equal to or lower than the outermost wall portion of the outflow-side housing 32. As shown in FIG.

The seat valve member 33 is welded or bonded to the inflow side housing 31 or the outflow side housing 32 . The seat valve member 33 and the inflow side housing 31 or the outflow side housing 32 form a connecting portion 317b that is connected by welding or adhesion. Welding can be performed, for example, by laser welding in which resin members are welded together using a laser. Welding is performed by superimposing the connecting portion of the seat valve member 33 and the connecting portion of the housing, and irradiating the seat valve member 33 with a laser to melt the connecting portion of the housing. In this case, the seat valve member 33 is made of a resin material that is transparent to laser light. The housing is composed of a member that absorbs laser light by containing carbon or the like, for example. The bonding can be performed, for example, by forming a laminated portion with an adhesive interposed between the connecting portion of the seat valve member 33 and the connecting portion of the housing, and applying heat to the laminated portion.

11 to 14 show examples in which the seat valve member 33 and the inflow side housing 31 are joined by welding or adhesion. 13 and 14 show both sides of the seat valve member 33 so that the position of the joint 317b in the seat valve member 33 can be easily understood.

As shown in FIG. 11, the flange portion 33f is sandwiched between an annular concave portion 317 located inside the flange portion 31f and a portion located inside the flange portion 32f. The annular recessed portion 317 is a portion recessed from the flange portion 31f, and is provided on the inner peripheral edge located inside the flange portion 31f. A contact portion between the annular concave portion 317 and the flange portion 33f is joined by welding or adhesion.

As shown in FIGS. 12 to 14, the contact portion between the annular recess 317 and the flange portion 33f constitutes a peripheral joint portion 317b1 that is part of the joint portion 317b. The peripheral coupling portion 317b1 is provided over substantially the entire area of the annular recessed portion 317. As shown in FIG. The peripheral coupling portion 317b1 is provided over substantially the entire surface of the flange portion 33f on the inflow side housing 31 side. The peripheral coupling portion 317b1 is formed to surround the first tubular portion 331a and the second tubular portion 331b. As shown in FIG. 12, the peripheral coupling portion 317b1 is provided on the inner peripheral edge portion along the flange portion 33f. As shown in FIG. 14, the peripheral coupling portion 317b1 is provided along the outer peripheral edge of the surface of the plate-like portion 333 on the side of the valve seat.

The purge valve 3 has a partition coupling portion 371b2 as part of the coupling portion 317b. The coupling portion 317b includes a peripheral coupling portion 317b1 and a partition coupling portion 371b2 extending from the peripheral coupling portion 317b1. The partition coupling portion 371b2 is a portion where the seat valve member 33 and the inflow side housing 31 are coupled by welding or adhesion. As shown in FIGS. 12 and 14, the partition coupling portion 371b2 extends seamlessly from the peripheral coupling portion 317b1. As shown in FIG. 12, the inflow-side housing 31 is provided with a partition wall 318 that extends inward from an annular recess 317 without a break. A partition wall 318 extends from the annular recess 317 across the inlet housing 31 between the first and second solenoid portions. The partition wall 318 is a projecting wall that extends inwardly from the annular recess 317 so as to cross between the first tubular portion 331a and the second tubular portion 331b. The partition wall 318 is formed in the inflow side housing 31 so as to have the same height as the annular recess 317 in the connecting direction as shown in FIG.

As shown in FIG. 10, the partition wall 318 is provided closer to the downstream end 331a1 of the first cylindrical portion than the first valve seat 332a. The partition wall 318 is provided closer to the downstream end portion 331b1 of the second cylindrical portion than the second valve seat 332b.

The partition coupling portion 317b2 is a coupling portion that integrally couples the top surface of the partition wall 318 and the portion of the plate-like portion 333 with which the partition wall 318 contacts. The inflow-side housing 31 has a cross contact portion 319 which is a projecting wall that intersects the partition wall 318 so as to traverse it. As shown in FIGS. 12 to 14, the cross contact portion 319 extends so as to protrude in the direction in which the solenoid portions are arranged on both sides of the end portion of the partition wall 318 extending from one side to the other side. The cross contact 319 is in non-bonded contact with the seat valve member 33, not welded or glued, unlike the partition wall 318. As shown in FIG. In other words, the cross contact portion 319 and the plate-like portion 333 are non-bonded portions that are only in contact and are not fixed.

When the solenoid valve in the purge valve 3 opens and closes, vibration propagates radially around the valve seat on which the valve body is seated. Accompanied by this radial vibration propagation, a radially expanding radiation sound can be generated. When only one of the two solenoid valves opens and closes, vibration propagates radially from the valve seat on one side to generate radiation sound. In this case, the vibration propagating from the valve seat on one side is prevented from expanding radially by the partition coupling portion 317b2. In this way, the partition coupling portion 317b2 suppresses the vibration propagation from the one-side valve seat to the one-side region, thereby contributing to suppressing the vibration area. In addition, the partition wall 318 and the partition coupling portion 317b2 reinforce the seat valve member 33 between the first valve seat 332a and the second valve seat 332b to increase the rigidity. As a result, the partition wall 318 and the partition coupling portion 317b2 prevent the seat valve member 33 from bending due to the vibration caused by the opening and closing operation of the valve body. By suppressing the bending of the seat valve member 33, it is possible to suppress the vibration of the purge valve 3 due to the opening and closing operations of the valve body.

In addition, the cross contact portion 319 inhibits the vibration that collides with the partition wall 318 from propagating in the direction in which the partition wall 318 extends and from propagating beyond the partition wall 318 . Thus, the cross contact portion 319 contributes to suppressing the spread of vibration propagation through the partition wall 318 . In addition, since the cross contact portion 319 extends in both directions crossing the partition wall 318, it also has the effect of inhibiting the range of vibration that propagates radially around the valve seat.

The purge valve 3 is fixed to a vehicle-side member by fixing means such as bolts via a plurality of mounting portions. For example, the vehicle-side member is embedded with a female threaded portion that is screwed onto the bolt. The purge valve 3 has a first attached portion 34 projecting outward from a first side wall 311 of the inflow side housing 31 . The first mounting portion 34 is provided with a mounting hole penetrating in the connecting direction in which the inflow side housing 31 and the outflow side housing 32 are superimposed. The attachment hole of the first attached portion 34 is a through hole for inserting fixing means such as a bolt coupled to the vehicle-side member. The first attached portion 34 is arranged at a position biased to one side of the inflow-side housing 31 . The first attached portion 34 is arranged laterally so as to be aligned with the first solenoid valve 37 in the inflow-side housing 31 .

The purge valve 3 has a second attached portion 35 projecting outward from the second side wall 312 of the inflow side housing 31 . The second mounting portion 35 is provided with a mounting hole penetrating in the connecting direction in which the inflow side housing 31 and the outflow side housing 32 are superimposed. The attachment hole of the second attached portion 35 is a through hole for inserting fixing means such as a bolt coupled to the vehicle-side member. The second attached portion 35 is arranged at a position deviated to one side in the direction in which the solenoid portions are arranged in the inflow-side housing 31 . The second attached portion 35 is arranged laterally so as to be aligned with the second solenoid valve 38 in the inflow side housing 31 . The first attached portion 34, the first solenoid portion, the second solenoid portion, and the second attached portion 35 are arranged so as to overlap in the direction in which the first solenoid portion and the second solenoid portion are arranged.

The purge valve 3 has a third mounting portion 36 protruding outward from a third side wall 313 of the inflow side housing 31 . The third attached portion 36 is provided on a third side wall 313 located on one side of the inflow side housing 31 and adjacent to the first attached portion 34 and the second attached portion 35 . The third mounting portion 36 is provided with a mounting hole penetrating in the connecting direction in which the inflow side housing 31 and the outflow side housing 32 are superimposed. The attachment hole of the third attached portion 36 is a through hole for inserting fixing means such as a bolt coupled to the vehicle-side member.

The second solenoid valve 38 is configured such that the flow rate of fluid flowing through the fully opened second internal passage 43b is the smallest among the plurality of solenoid valves. The first solenoid valve 37 is configured such that the flow rate of fluid flowing through the fully opened first internal passage 43 a is greater than that of the second solenoid valve 38 . In the purge valve 3, the first solenoid valve 37 is a flow control valve that provides large flow capacity, and the second solenoid valve 38 is a flow control valve that provides small flow capacity. The first internal passage 43a is formed to have a passage cross-sectional area larger than that of the second internal passage 43b.

The first internal passage 43a is formed such that the flow rate of fluid that can flow down is greater than that of the second internal passage 43b. With this configuration, the vibration accompanying the opening/closing operation of the first valve body 42a can be larger than the vibration accompanying the opening/closing operation of the second valve body 42b. The purge valve 3 has a structure in which the first mounted portion 34 and the second mounted portion 35 are arranged side by side with the first solenoid portion interposed therebetween as a structure capable of suppressing this vibration.

For example, when the flow rate supplied to the engine 2 is a small flow rate request, the first solenoid valve 37 is closed, and the second solenoid valve 38 is energized and controlled by the control device to be opened. When a small flow rate is requested, the control device energizes the coil portion 410 of the second solenoid valve 38 by controlling the ratio of the ON time to the total time of energization ON and OFF, that is, the duty ratio. When a small flow rate is required, a small flow rate of evaporated fuel flowing through the second internal passage 43b is supplied from the outflow port 32a into the intake pipe 21 by duty energization control.

When a small flow rate is requested and a large flow rate is requested, the second solenoid valve 38 is kept open, and the first solenoid valve 37 is duty energized and opened. When a large flow rate is required, in addition to a small flow rate flowing through the fully open second internal passage 43b, a large flow rate of evaporated fuel flowing through the first internal passage 43a is supplied from the outflow port 32a into the intake pipe 21 by duty energization control. be done. When a small flow rate is requested, control is performed so that the valve opening rate of the second valve body 42b increases toward a large flow rate request, thereby increasing the supply flow rate. When a large flow rate is required, the supply flow rate is controlled so that the valve opening rate of the first valve body 42a increases from the supply flow rate when the second valve body 42b is in the normally open state. With such control, the rate of increase in flow rate when a large flow rate is requested becomes greater than the rate of increase in flow rate when a small flow rate is requested. The purge valve 3 is controlled so that the second solenoid valve 38, which provides a small flow rate performance, is first opened when the supply flow to the engine 2 is zero.

The effects of the purge control valve device disclosed by the purge valve 3 of the first embodiment will be described. The purge control valve device comprises a first internal passageway 43a and a second internal passageway 43b which are part of the internal passageway connecting the inflow port 31a and the outflow port 32a. The purge control valve device includes a first solenoid portion that generates an electromagnetic force that displaces a first valve body 42a that can open and close the first internal passage 43a, and a second valve body 42b that can open and close the second internal passage 43b. and a second solenoid portion that generates an electromagnetic force that causes the The purge control valve device includes a solenoid housing in which both a first solenoid portion and a second solenoid portion are resin-molded, and a seat valve member 33 . The seat valve member 33 is made of resin in which a first valve seat 332a and a second valve seat 332b are integrally formed, and is joined to the solenoid housing by welding or adhesion.

This device includes a solenoid housing in which two solenoid valves are resin-molded, and a seat valve member 33 integrally formed with two valve seats. Furthermore, since the seat valve member 33 and the solenoid housing are joined by welding or adhesion, it is possible to provide a purge control valve device with a reduced number of parts. Furthermore, the purge control valve device can reduce the joint area by welding or bonding as compared with a device having both a member having a first valve seat and a member having a second valve body.

The seat valve member 33 includes a first tubular portion 331a, a second tubular portion 331b, and a plate-shaped portion integrally formed with the first tubular portion 331a and the second tubular portion 331b projecting in the thickness direction. 333. The seat valve member 33 and the solenoid housing have a peripheral joint 317b1 that is welded or glued together. The peripheral coupling portion 317b1 is provided so as to surround the first tubular portion 331a and the second tubular portion 331b.

According to this configuration, since the peripheral coupling portion 317b1 annularly surrounds the first valve seat 332a and the second valve seat 332b, vibrations radially propagating through the plate-like portion 333 due to valve closing are suppressed. According to the peripheral coupling portion 317b1, it is possible to suppress the radiated sound expanding around the first valve seat 332a and the second valve seat 332b.

The seat valve member 33 and the solenoid housing further have a partition coupling portion 317b2 coupled by welding or adhesion. The partition coupling portion 317b2 extends inward from the peripheral coupling portion 317b1 so as to cross between the first tubular portion 331a and the second tubular portion 331b. According to this configuration, the partition coupling portion 317b2 can suppress the radial vibration propagating from the first valve seat 332a side from expanding toward the second valve seat 332b side. Furthermore, the partition coupling portion 317b2 can suppress the radial vibration propagating from the second valve seat 332b side from expanding toward the first valve seat 332a side.

The partition coupling portion 317b2 is located closer to the downstream end 331a1 of the first cylindrical portion and closer to the downstream end 331b1 of the second cylindrical portion than the first valve seat and the second valve seat. According to this configuration, the first valve seat and the second valve seat, which are the starting points of vibration when the valve is closed, and the partition coupling portion 317b2 are separated from each other in the extending direction of the cylindrical portion. As a result, the propagation distance of the vibration from the first valve seat and the second valve seat to the partition coupling portion 317b2 can be increased, which contributes to suppressing the vibration until it propagates to the partition coupling portion 317b2.

The partition coupling portion 317 b 2 is formed at a contact portion between the partition wall 318 projecting from the solenoid housing toward the plate-like portion 333 and the plate-like portion 333 . According to this configuration, the projecting height dimension of the partition wall 318 has the effect of absorbing the radiated vibration and radiated sound propagated to the partition coupling portion 317b2.

The solenoid housing further has a cross contact portion 319 which is a protrusion that crosses across the partition coupling portion 317b2. The cross contact 319 contacts the seat valve member 33 in a non-bonded manner without being welded or glued. According to this configuration, the cross contact portion 319 can absorb vibration or the like propagated to the partition coupling portion 317b2. This makes it possible to provide the purge valve 3 that suppresses the spread of vibration and the like to the surroundings through the partition coupling portion 317b2.

The first solenoid part and the second solenoid part are arranged side by side on one side of the solenoid housing and molded with resin. According to this configuration, the radial vibration tends to reach one side of the outer peripheral edge of the seat valve member 33 early and reaches the other side later. Since the peripheral coupling portion 317b1 annularly surrounds the first valve seat 332a and the second valve seat 332b, it contributes to stably reducing radial vibration unbalanced in the circumferential direction.

The first internal passage 43a is a passage formed to have a passage cross-sectional area larger than that of the second internal passage 43b. According to this configuration, the first solenoid valve 37 is a solenoid valve capable of controlling a larger flow rate of fluid than the second solenoid valve 38 . The seat valve member 33 is a member integrally having a first valve seat on which an electromagnetic valve for controlling a large flow rate is seated and a second valve seat on which an electromagnetic valve for controlling a small flow rate is seated. The seat valve member 33 is integrally provided with two valve seats that differ in radially propagating radiation vibration and radiation sound. Therefore, in the purge valve 3 in which the vibration and sound propagating through the seat valve member 33 are unbalanced, the purge valve 3 capable of effectively suppressing radiation noise can be provided. Also, the purge valve 3 can be provided that contributes to suppressing the larger radiated vibration and radiated sound propagating through the seat valve member 33 .

(Other embodiments)
The disclosure in this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations thereon by those skilled in the art. For example, the disclosure is not limited to the combination of parts and elements shown in the embodiments, and various modifications can be made. The disclosure can be implemented in various combinations. The disclosure can have additional parts that can be added to the embodiments. The disclosure encompasses abbreviations of parts and elements of the embodiments. The disclosure encompasses the permutations, or combinations of parts, elements between one embodiment and another. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical scope is indicated by the description of the claims, and should be understood to include all modifications within the meaning and range of equivalents to the description of the claims.

The purge control valve device capable of achieving the objects disclosed in the specification is not limited to the configurations described with reference to the drawings in the above-described embodiments. The purge valve in the previous embodiment is shown with the inlet port 31a positioned below the outlet port 32a. The positional relationship between the inflow port 31a and the outflow port 32a is not limited to this form. The inflow port 31a may be positioned above the outflow port 32a, or the inflow port 31a and the outflow port 32a may be arranged side by side. Also, the positional relationship between the inflow port 31a and the first internal passage 43a and the second internal passage 43b may be arranged in the vertical direction.

Reference Signs List 2 Engine 13 Canister 31 Inflow side housing (solenoid housing) 31a Inflow port 32a Outflow port 33 Seat valve member 37 First solenoid valve (first solenoid portion) 38 Second solenoid valve (Second solenoid part)
42a... First valve body 42b... Second valve body 43a... First internal passage 43b... Second internal passage 332a... First valve seat 332b... Second valve seat

Claims (7)

an inflow port (31a) into which vaporized fuel flowing out from the canister (13) flows;
an outflow port (32a) through which evaporated fuel flows out toward the engine (2);
a first internal passageway (43a) and a second internal passageway (43b), which are part of an internal passageway connecting said inflow port and said outflow port;
a first solenoid portion (37) that generates an electromagnetic force that displaces a first valve body (42a) capable of opening and closing the first internal passage;
a second solenoid portion (38) that generates an electromagnetic force that displaces a second valve body (42b) that can open and close the second internal passage;
a solenoid housing (31) in which both the first solenoid portion and the second solenoid portion are resin-molded and incorporated;
A first valve seat (332a) on which the first valve body is seated and a second valve seat (332b) on which the second valve body is seated are integrally formed and joined to the solenoid housing by welding or adhesion. a seat valve member (33) made of resin,
with
The seat valve member includes a first tubular portion (331a) having the first valve seat provided at its end and having the first internal passage therein, and a second cylindrical portion (331a) having the second valve seat provided at its end. A second tubular portion (331b) having an internal passage therein, and a plate-shaped portion (333) integrally formed with the first tubular portion and the second tubular portion projecting in the thickness direction. prepared,
The seat valve member and the solenoid housing surround the first tubular portion and the second tubular portion, and have a peripheral coupling portion (317b1) joined by welding or adhesion. The seat valve member and the solenoid housing extend inwardly from the peripheral coupling portion across between the first tubular portion and the second tubular portion and are joined by welding or adhesion. 2. The purge control valve device of claim 1 , further comprising a partition coupling portion (317b2) . The partition coupling portion is closer to the downstream end (331a1) of the first cylindrical portion and closer to the downstream end (331b1) of the second cylindrical portion than the first valve seat and the second valve seat. 3. The purge control valve arrangement of claim 2 , located at the . 4. The purge control valve device according to claim 3, wherein said partition coupling portion is formed at a contact portion between said plate-like portion and a partition wall (318) projecting from said solenoid housing toward said plate-like portion. The solenoid housing has a cross contact portion (319) which is a projection that crosses across the partition coupling portion and contacts the seat valve member in a non-bonded state that is not welded or glued. 5. A purge control valve arrangement according to any one of claims 2 to 4 , further comprising : The purge control according to any one of claims 1 to 5, wherein the first solenoid portion and the second solenoid portion are arranged side by side on one side of the solenoid housing and molded with resin. valve device. 7. The purge control valve device according to any one of claims 1 to 6 , wherein the first internal passage is a passage formed to have a passage cross-sectional area larger than that of the second internal passage .

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