JP2019190397A - Purge control valve - Google Patents

Abstract

To provide a purge control valve having a high degree of freedom regarding volume setting of a chamber room.SOLUTION: A purge control valve 4 comprises an inflow housing 5 having an inflow tubular part 50 formed with an inflow passage 50a through which evaporated fuel flowing from a canister 16 side flows, and a body housing 40 including an electromagnetic coil part 42 and connected to the inflow housing 5. The inflow housing 5 has a first chamber room 51a that has a larger passage cross-sectional area than that of the inflow passage 50a and is provided inside closer to the body housing 40 than the inflow passage 50a. The body housing 40 has a second chamber room 400a provided inside closer to the inflow housing 5 than a valve body 43.SELECTED DRAWING: Figure 4

Description

  The disclosure in this specification relates to a purge control valve provided in an evaporated fuel passage through which evaporated fuel flows toward an engine.

  Patent Document 1 describes that a purge valve having a built-in solenoid is installed in an evaporative fuel passage extending from a fuel tank via a canister toward an engine intake pipe. This purge control valve has a structure in which a cover having a solenoid coil incorporated therein is connected to a housing having an input port and an output port. Inside the housing, a chamber chamber is provided between a passage for opening and closing the valve body and the output port.

JP 2000-170948 A

  The purge control valve of Patent Document 1 has a problem that it is easily restricted in changing or setting the chamber volume so that it can cope with various required specifications for products and various vehicle environments.

  The purpose of the disclosure in this specification is to provide a purge control valve that has a high degree of freedom with respect to chamber chamber volume setting.

  A plurality of aspects disclosed in this specification adopt different technical means to achieve each purpose. Further, the reference numerals in parentheses described in the claims and in this section are examples showing the correspondence with specific means described in the embodiments described later as one aspect, and limit the technical scope. is not.

One of the disclosed purge control valves is a purge control valve (4; 104; 204) installed in an evaporated fuel passage through which evaporated fuel desorbed from the canister (16) flows toward the engine (22). An inflow housing (5; 105) having an inflow portion (50) in which an inflow passage (50a) through which evaporated fuel flowing from the canister flows is formed, and a valve body for opening and closing the in-housing passage (401a) A main body housing (40; 140; 240) having a built-in electromagnetic coil portion (42) for driving (43) and connected to an inflow housing;
The inflow housing has a passage cross-sectional area larger than that of the inflow passage, and has a first chamber chamber (51a) provided closer to the main body housing than the inflow passage, and the main body housing is more inflow than the valve body. It has the 2nd chamber room (400a) provided in the near side.

  According to this purge control valve, by setting the respective volumes of the first chamber chamber in the inflow housing and the second chamber chamber in the main body housing, the volume of the chamber chamber upstream from the valve body can be selected in a wide range. can do. As a result, a purge control valve having a chamber volume that can cope with various required specifications for products and various vehicle environments can be obtained. As described above, it is possible to provide a purge control valve having a high degree of freedom with respect to the chamber chamber volume setting.

It is the schematic which showed the evaporated fuel processing system which can mount the purge control valve of 1st Embodiment. It is the front view which showed the purge control valve of 1st Embodiment. It is the bottom view which showed the purge control valve of 1st Embodiment. It is sectional drawing which showed the IV-IV cut surface in FIG. It is sectional drawing which showed the purge control valve of 2nd Embodiment. It is sectional drawing which showed the purge control valve of 3rd Embodiment.

  Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly show that combinations are possible in each embodiment, but also combinations of the embodiments even if they are not specified, unless there is a particular problem with the combination. Is also possible.

(First embodiment)
A first embodiment will be described with reference to FIGS. The evaporative fuel processing system shown in FIG. 1 supplies HC gas or the like in the fuel adsorbed by the canister 16 to the intake passage of the engine 22 and prevents the evaporative fuel from the fuel tank 14 from being released into the atmosphere. It is also a system to do. This evaporative fuel processing system includes a purge control valve 4 that can adjust the flow rate of the evaporative fuel supplied to the intake passage at a predetermined position in the evaporative fuel passage. The purge control valve 4 includes at least a main body housing 40 having a built-in electromagnetic coil portion 42, an inflow housing 5 coupled to the main body housing 40, and an outflow member 6 coupled to the main body housing 40. Each of the main body housing 40, the inflow housing 5, and the outflow member 6 is formed of a resin material.

  The evaporated fuel introduced into the intake system 1 of the engine 22 is mixed with combustion fuel supplied to the engine 22 from an injector or the like and burned in a cylinder of the engine 22. The intake system 1 of the engine 22 is configured by connecting one end side of an intake pipe 10 to an intake manifold 20 of the engine 22 via a throttle valve 21, and further providing a filter 13 in the middle of the intake pipe 10. The evaporative fuel purge system 2 is formed by connecting a fuel tank 14 and a canister 16 to an intake manifold 20 via a pipe 15, a pipe 17, a pipe 19 and a pipe 18.

  The filter 13 is provided at the most upstream part of the intake pipe 10 and captures dust, dust, and the like in the intake air. The throttle valve 21 is an intake air amount adjustment valve that adjusts the amount of intake air flowing into the intake manifold 20 by adjusting the opening at the inlet of the intake manifold 20 in conjunction with the accelerator pedal. The intake air sequentially passes through the filter 13 and the throttle valve 21, 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 cylinder.

  The fuel tank 14 is a container for storing fuel such as gasoline. The fuel tank 14 is connected to the inflow portion 16 a of the canister 16 by a pipe 15. The canister 16 is a container in which an adsorbent such as activated carbon is enclosed. The canister 16 takes in evaporated fuel generated in the fuel tank 14 from the inflow portion 16a via the pipe 15 and temporarily adsorbs the adsorbent on the adsorbent. The canister 16 is provided with a suction portion 16b for sucking fresh fresh air. By providing the canister 16 with the suction portion 16 b, atmospheric pressure acts in the canister 16. The canister 16 can easily remove the evaporated fuel adsorbed on the adsorbent by the freshly sucked air.

  For example, a valve module is integrally provided in the suction portion 16b. The valve module has a built-in canister close valve that opens and closes the intake section for inhaling fresh outside air, and an internal pump that can release gas to the atmosphere and inhale the atmosphere. Yes. When the canister 16 includes the canister close valve, atmospheric pressure can be applied to the canister 16. The canister 16 can easily desorb, that is, purge, the evaporated fuel adsorbed on the adsorbent by the freshly sucked air.

  The canister 16 is provided with an outflow portion 16c through which the evaporated fuel separated from the adsorbent flows out. One end side of the pipe 17 is connected to the outflow part 16c. The other end side of the pipe 17 is connected to the inflow portion of the purge control valve 4. Here, the passage in the pipe 17 is also referred to as a fuel inflow passage through which fuel flows into the purge control valve 4. The purge control valve 4 and the check valve device 3 communicate with each other by a configuration connected by a pipe 19. The outflow side of the check valve device 3 is connected to one end side of the pipe 18. Here, the passage in the pipe 18 is also referred to as a fuel outflow passage through which the fuel flowing out from the purge control valve 4 passes. The other end side of the pipe 18 is connected to the inflow portion of the intake manifold 20.

  The purge control valve 4 is an opening / closing means for opening and closing the evaporated fuel passage, and can permit and block the supply of the evaporated fuel flowing out from the canister 16 to the engine 22. As shown in FIG. 4, the purge control valve 4 includes a valve body 43 and an electromagnetic coil part 42 including a coil part 420, a spring 424, and the like. The purge control valve 4 opens and closes the in-housing passage 401a by driving the valve body 43 in accordance with the balance between the electromagnetic force generated when the coil portion 420 is energized and the biasing force of the spring 424.

  The purge control valve 4 includes a main body housing 40 that forms a housing inner passage 401a. The purge control valve 4 normally maintains a state in which a housing passage that forms an evaporative fuel passage is closed. When the coil portion is energized, the electromagnetic force overcomes the elastic force of the spring 424, and the valve body 43 The housing passage is opened away from the seat 63. The control device controls the ratio of the on time to the time of one cycle formed by the on time and off time of energization, that is, the duty ratio, and energizes the coil unit. The purge control valve 4 is also called a duty control valve. By this energization control, the flow rate of the evaporated fuel flowing through the passage in the housing is adjusted.

  The check valve device 3 is an evaporative fuel passage extending from the canister 16 to the intake pipe 10 and is a valve for preventing a reverse flow installed between the purge control valve 4 and the intake manifold 20. The check valve device 3 allows the original flow of the evaporated fuel from the fuel inflow passage (passage in the pipe 19) to the fuel outflow passage (passage in the pipe 18) in the evaporative fuel passage. Prevents the backflow of evaporated fuel to the inflow passage. The check valve device 3 includes a valve body that operates to open the flow path with the original flow of the evaporated fuel and close the flow path with the reverse flow of the evaporated fuel.

  When the purge control valve 4 is opened by the control device while the vehicle is running, a difference 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 16 occurs. Due to this pressure difference, the vapor fuel adsorbed in the canister 16 flows through the fuel inflow passage, the purge control valve 4, the check valve device 3, and the fuel outflow passage, and is sucked into the intake manifold 20.

  The evaporated fuel sucked into the intake manifold 20 is mixed with the original combustion fuel supplied from the injector or the like to the engine 22 and burned in the cylinder of the engine 22. Further, in the cylinder of the engine 22, the air-fuel ratio, which is the mixing ratio of the combustion fuel and the intake air, is controlled so as to become a predetermined air-fuel ratio. The control device performs duty control on the opening time and the closing time of the purge control valve 4 to adjust the purge amount of the evaporated fuel so that the predetermined air-fuel ratio is maintained even if the evaporated fuel is purged.

  As shown in FIGS. 2 to 4, the purge control valve 4 includes an inflow housing 5, an outflow member 6, and a main body housing 40 to which the inflow housing 5 and the outflow member 6 are connected. Yes. The inflow housing 5 is a member that allows the pipe 17 and the main body housing 40 to communicate with each other. The outflow member 6 is a member that allows the main body housing 40 and the pipe 19 to communicate with each other.

  The inflow housing 5 includes an inflow tubular portion 50 into which evaporated fuel from the canister 16 side flows, a chamber chamber forming portion 51 that forms the first chamber chamber 51a, and a flange portion that is fixed to the main body housing 40 by welding or bonding. 52. The inflow tubular portion 50 is an inflow portion having an inflow passage 50a inside. The inflow tubular portion 50 forms an inflow passage 50a through which evaporated fuel flowing out to the first chamber chamber 51a flows. The inflow tubular portion 50 is connected to a pipe 17 that forms an evaporative fuel passage in the evaporative fuel processing system, and communicates with the canister 16 via the pipe 17.

  The chamber chamber forming portion 51 is a cylinder in which an inflow tubular portion 50 is integrally provided on an annular wall portion located at the upstream end, and a radially projecting flange portion 52 is formed on the outer peripheral edge of the opening located at the downstream end. It is a shape part. The flange portion 52 is a portion joined to the flange portion 400 b of the main body housing 40. The flange portion 52 is integrally joined in a state of being overlapped with the flange portion 400b.

  The chamber chamber forming portion 51 forms a first chamber chamber 51a that is an internal space such as a rectangular parallelepiped shape, a cubic shape, or a cylindrical shape. The first chamber chamber 51a communicates with the inflow passage 50a having a smaller passage cross-sectional area than the first chamber chamber 51a at the upstream end, and communicates with the second chamber chamber 400a in the main body housing 40 at the downstream end. The passage cross-sectional area of the first chamber chamber 51a is a cross-sectional area when the first chamber chamber 51a is cut by a plane orthogonal to the central axis of the passage formed by the first chamber chamber 51a. The passage cross-sectional area of the inflow passage 50a is a cross-sectional area when the inflow passage 50a is cut by a plane orthogonal to the central axis of the inflow passage 50a. Therefore, in the fuel vapor passage, the passage cross-sectional area increases abruptly when it advances from the inflow passage 50a to the first chamber chamber 51a. The first chamber chamber 51 a provides a chamber volume that has an effect of reducing pulsation generated in the purge control valve 4.

  The main body housing 40 has a bottom portion on one end side, a downstream opening portion on the other end side opposite to the one end side, and a side opening with respect to the bottom portion at the downstream opening portion. It has an upstream opening that opens in a direction that intersects it. The main body housing 40 accommodates a valve body 43 for opening and closing the in-housing passage 401a and an electromagnetic coil portion 42 for driving the valve body 43. The electromagnetic coil portion 42 is integrally installed on the bottom portion of the main body housing 40.

  The downstream opening and the upstream opening are circular. A flange portion 401b that protrudes radially outward is provided on the entire circumference of the downstream opening. A flange portion 400b that protrudes radially outward is provided on the entire circumference of the upstream opening. The flange portion 400 b is a portion joined to the flange portion 52 of the inflow housing 5.

  The main body housing 40 includes a chamber chamber forming portion 400 and an outflow side tubular portion 401 that extends in a direction intersecting the chamber chamber forming portion 400 and is connected to the outflow member 6. . The chamber chamber forming portion 400 and the outflow side tubular portion 401 form an extending passage and an opening that opens in a direction orthogonal to each other. The chamber chamber forming portion 400 is a cylindrical portion in which a flange portion 400b that protrudes radially is formed on the outer peripheral edge of the opening located at the upstream end, and the second chamber chamber 400a is formed downstream of the opening. The second chamber chamber 400 a provides a chamber volume that has an effect of reducing pulsation generated in the purge control valve 4. The second chamber chamber 400a communicates with the first chamber chamber 51a having a volume larger than that of the second chamber chamber 400a at the upstream end, and a main body internal throttle passage 402a having a smaller passage cross-sectional area than the second chamber chamber 400a at the downstream end. Communicate. The passage cross-sectional area of the second chamber chamber 400a is a cross-sectional area when the second chamber chamber 400a is cut by a plane orthogonal to the central axis of the passage formed by the second chamber chamber 400a. The passage cross-sectional area of the main body inner throttle passage 402a is a cross-sectional area when the main body inner throttle passage 402a is cut by a plane orthogonal to the central axis of the main body inner throttle passage 402a.

  The flange portion 400 b is a portion joined to the flange portion 52 of the inflow housing 5. The outflow side tubular portion 401 is a tubular portion in which a flange portion 401b that protrudes radially is formed on the outer peripheral edge of the opening located at the downstream end, and a columnar space is formed upstream of the opening. The flange portion 401 b is a portion joined to the flange portion 61 of the outflow member 6.

  The main body housing 40 includes a communication wall portion 402 in which the chamber chamber forming portion 400 and the outflow side tubular portion 401 are connected. The connecting wall portion 402 is a wall portion that connects the intersecting chamber chamber forming portion 400 and the outflow side tubular portion 401 in the main body housing 40. The main body housing 40 has a main body internal throttle passage 402 a formed between the communication wall portion 402 and the electromagnetic coil portion 42. The main body internal throttle passage 402a is a passage having a smaller passage cross-sectional area than the second chamber chamber 400a. The passage cross-sectional area of the main body inner throttle passage 402a is a cross-sectional area when the main body inner throttle passage 402a is cut by a plane orthogonal to the central axis of the passage formed by the main body inner throttle passage 402a. Accordingly, the inflow passage 50a and the main body internal throttle passage 402a are passages that have a passage cross-sectional area reduced on the upstream side and the downstream side with respect to the first chamber chamber 51a and the second chamber chamber 400a.

  The purge control valve 4 includes a valve body 43, a movable core 422, an electromagnetic coil unit 42, and the like. The purge control valve 4 is fixed to a member on the vehicle side by, for example, a bolt that is screwed into a nut embedded in the main body housing 40. The movable core 422 is made of a magnetic material, such as a magnetic material. The movable core 422 that is a cylindrical body surrounds the shaft member 425 and the spring 424 that are inserted from the open end. The valve body 43 is made of an elastically deformable material such as rubber. The valve body 43 is attached to the movable core 422 so as to be integrated with the movable core 422 so that the base portion and the valve portion sandwich the head of the movable core 422 from both sides.

  The fixed core 423 slidably supports the movable core 422 that moves in the axial direction against the urging force of the spring 424 by electromagnetic force. The spring 424 has a cylindrical portion of the movable core 422 in a state where one end in the axial direction is in contact with the shaft member 425 fixed to the fixed core 423 and the other end in the axial direction is in contact with the head of the movable core 422. It is provided inside. Therefore, the spring 424 provides an urging force for moving the movable core 422 to the valve seat 63 side. The fixed core 423 fixes the shaft member 425 and is assembled to a bobbin 421 to be externally fitted. The fixed core 423, the shaft member 425, the movable core 422, and the valve body 43 are installed such that the axes are coaxial. The shaft member 425 is made of, for example, polybutylene terephthalate reinforced with polybutylene terephthalate or glass fiber. The fixed core 423 and the movable core 422 are made of a material that allows magnetism to pass through. The fixed core 423 is made of, for example, a cold forging carbon steel wire. The movable core 422 includes a metal constituent part in which a steel plate is coated with a fluororesin, and a rubber constituent part of low-temperature fluororubber that can maintain rubber elasticity even in a low-temperature region.

  A filter may be provided in the main body housing 40 on the upstream side of the in-housing passage 401a.

  As shown in FIGS. 2 to 4, the main body housing 40 includes a connector 403 that extends outward at the bottom on one end side where the electromagnetic coil portion 42 is installed. The connector 403 includes a terminal 403 a for energizing the coil unit 420. The connector 403 is a resin molding part that supports a terminal 403 a that penetrates the bottom from the inside of the main body housing 40 and protrudes to the outside. The terminal 403 a is an energization terminal that is electrically connected to the coil unit 420. The connector 403 is connected to a power supply side connector for supplying power from the power supply unit and the current control device. When the connector 403 and the power supply side connector are connected and the terminal 403a is electrically connected to a current control device or the like, the purge control valve 4 can control the current supplied to the coil section 420.

  The outflow member 6 includes a flange portion 61 that is fixed to the main body housing 40 by welding or adhesion, and an outflow tubular portion 60 that protrudes from the flange portion 61 in a direction orthogonal to the flange portion 61. The outflow tubular portion 60 is an outflow portion having an outflow passage 60a therein. The outflow tubular portion 60 forms an outflow passage 60a through which the evaporated fuel flowing out from the in-housing passage 401a flows. The outflow tubular portion 60 is connected to a pipe 19 that forms an evaporated fuel passage in the evaporated fuel processing system, and communicates with the check valve device 3 through the pipe 19.

  The outflow member 6 further includes a cylindrical portion 62 that projects to the opposite side of the outflow tubular portion 60 in the flange portion 61. The cylindrical part 62 has a valve seat 63 with which the valve element 43 contacts on the tip side. The cylindrical portion 62 has a shape that protrudes to the inside of the main body housing 40 through the opening of the flange portion 401b, and an internal passage through which evaporated fuel flowing out from the in-housing passage 401a flows when the valve body 43 is in the valve open state. 62a inside.

  The flange portion 61 is a portion that protrudes radially outward in the radial direction on the entire circumference of the connecting portion where the tubular portion 62 and the outflow tubular portion 60 are connected. The flange portion 61 is a portion joined to the flange portion 401 b of the main body housing 40. The flange portion 61 is integrally joined in a state where the flange portion 61 is overlapped with the flange portion 401b.

  Next, the effect which the purge control valve 4 of 1st Embodiment brings is demonstrated. The purge control valve 4 is a flow rate control valve installed in an evaporative fuel passage through which evaporative fuel desorbed from the canister 16 flows toward the engine 22. The purge control valve 4 includes an inflow housing 5 having an inflow tubular portion 50 formed with an inflow passage 50a through which evaporated fuel flowing from the canister 16 side flows, and a main body housing 40 to which the inflow housing 5 is connected. Prepare. The main body housing 40 incorporates an electromagnetic coil portion 42 that drives a valve body 43 that opens and closes the in-housing passage 401a. The inflow housing 5 has a passage cross-sectional area larger than that of the inflow passage 50a, and includes a first chamber chamber 51a provided inside the main body housing 40 closer to the inflow passage 50a. The main body housing 40 has a second chamber chamber 400 a provided inside the inflow housing 5 rather than the valve body 43.

  According to the purge control valve 4, the volume of the chamber chamber upstream of the valve body 43 can be selected in a wide range by setting the respective volumes of the first chamber chamber 51a and the second chamber chamber 400a. it can. In order to secure the chamber volume on the upstream side of the valve body 43, for example, by adjusting only the volume of the first chamber chamber 51a without changing the volume of the second chamber chamber 400a, only the inflow housing 5 is newly provided. The manufactured purge control valve 4 can be provided. Further, for example, by adjusting only the volume of the second chamber chamber 400a without changing the volume of the first chamber chamber 51a, it is possible to provide the purge control valve 4 in which only the main body housing 40 is newly manufactured. Further, for example, it is possible to provide the purge control valve 4 that secures the chamber volume on the upstream side of the valve element 43 by adjusting both the volume of the first chamber chamber 51a and the volume of the second chamber chamber 400a. Thus, by providing the chamber chambers in both the housings, it is possible to provide the purge control valve 4 having a chamber volume that can cope with various required specifications for products and various vehicle environments. The purge control valve 4 has a high degree of freedom with respect to the chamber chamber volume setting.

  The main body housing 40 has a chamber chamber forming portion 400 that forms the second chamber chamber 400 a and an outflow side tubular shape that extends in a direction intersecting the chamber chamber forming portion 400 and is connected to the outflow member 6. Part 401. Inside the main body housing 40, there is provided a main body inner throttle passage 402 a formed between the communication wall portion 402 connecting the chamber chamber forming portion 400 and the outflow side tubular portion 401 and the electromagnetic coil portion 42. ing. The inflow passage 50a and the main body internal throttle passage 402a of the inflow housing 5 have a small passage cross-sectional area on the upstream side and the downstream side with respect to the first chamber chamber 51a and the second chamber chamber 400a.

  According to this configuration, a pressure loss is imparted to the pulsating flow propagating upstream in the valve-closed state by the main body internal throttle passage 402a, diffused in both chamber chambers, and the pressure loss is again imparted by the inflow passage 50a. Can do. As a result, the pulsation flow is forced to contract, diffuse, and contract toward the upstream, so that it is possible to provide the purge control valve 4 that contributes to effectively dampening the pulsation.

  The second chamber chamber 400a preferably has a larger volume than the first chamber chamber 51a. According to this configuration, the size of the inflow housing 5 can be suppressed, and by increasing the size of the main body housing 40, the chamber volume on the upstream side of the purge control valve 4 can be expanded over a wide range. Further, by setting the size of the main body housing 40 large, the electromagnetic coil portion 42 can be installed in the main body housing 40 with a high degree of freedom.

  The first chamber chamber 51a preferably has a larger volume than the second chamber chamber 400a. According to this configuration, the size of the main body housing 40 can be suppressed, and the size of the inflow housing 5 can be set large so that the chamber volume on the upstream side of the purge control valve 4 can be expanded over a wide range.

(Second Embodiment)
A second embodiment will be described with reference to FIG. The configuration, operation, and effects not particularly described in the second embodiment are the same as those in the first embodiment, and only differences from the first embodiment will be described below.

  The second embodiment is different from the first embodiment in the configuration of a passage that allows the first chamber chamber 51a and the second chamber chamber 400a to communicate with each other. As shown in FIG. 5, the purge control valve 104 includes an inflow housing 5, an outflow member 6, and a main body housing 140 to which the inflow housing 5 and the outflow member 6 are connected. The inflow housing 5 is a member that allows the pipe 17 and the main body housing 140 to communicate with each other. The outflow member 6 is a member for communicating the main body housing 140 and the pipe 19.

  The chamber chamber forming portion 400 provided in the main body housing 140 has an annular wall portion 44 protruding from the inner wall surface to the upstream end of the second chamber chamber 400a at the upstream end. The main body housing 140 includes a connection passage 44 a that is a through hole formed in the center of the annular wall portion 44. The connection passage 44a is a passage that communicates the first chamber chamber 51a and the second chamber chamber 400a. The connection passage 44a is a passage having a passage cross-sectional area smaller than that of the first chamber chamber 51a and the second chamber chamber 400a, and provides a flow resistance to the fluid. The passage cross-sectional area of the connection passage 44a is a cross-sectional area when the connection passage 44a is cut by a plane orthogonal to the central axis of the connection passage 44a. As described above, the first chamber chamber 51a and the second chamber chamber 400a are provided on the upstream side and the downstream side of the connection passage 44a so that the flow resistance is reduced with respect to the connection passage 44a.

  According to the second embodiment, the purge control valve 104 has a smaller passage cross-sectional area than each of the first chamber chamber 51a and the second chamber chamber 400a, and allows the first chamber chamber 51a and the second chamber chamber 400a to communicate with each other. A connecting passage 44a. According to this configuration, the pulsating flow propagating upstream in the valve-closed state is diffused in the second chamber chamber 400a, then subjected to pressure loss by the connection passage 44a, and further diffused in the second chamber chamber 400a. Pressure loss is again given by the inflow passage 50a. As a result, the pulsating flow is forced to diffuse, contract, diffuse, and contract toward the upstream, so that the purge control valve 104 that contributes to effectively dampening the pulsation can be provided.

(Third embodiment)
A third embodiment will be described with reference to FIG. The configuration, operation, and effects not particularly described in the third embodiment are the same as those in the first embodiment, and only differences from the first embodiment will be described below.

  The third embodiment is different from the first embodiment in the configuration of the passage that allows the first chamber chamber 51a and the second chamber chamber 400a to communicate with each other. As shown in FIG. 6, the purge control valve 204 includes an inflow housing 105, an outflow member 6, and a main body housing 240 to which the inflow housing 105 and the outflow member 6 are connected. The inflow housing 105 is a member that allows the pipe 17 and the main body housing 240 to communicate with each other. The outflow member 6 is a member that allows the main body housing 240 and the pipe 19 to communicate with each other.

  The chamber chamber forming portion 51 provided in the inflow housing 105 has an upstream protruding wall 53 protruding from the inner wall surface to the first chamber chamber 51a between the annular wall portion positioned at the upstream end and the flange portion 52. Yes. Since the upstream protruding wall 53 protrudes from the inner wall surface located on the side where the electromagnetic coil portion 42 is provided in the chamber chamber forming portion 51, the upstream protruding wall 53 and the chamber chamber forming portion 51 have an inner wall. A first throttle passage 53a is formed between the wall surfaces. The first throttle passage 53a is a passage having a smaller passage cross-sectional area than the first chamber 51a, and provides a flow resistance to the fluid. The passage cross-sectional area of the first throttle passage 53a is a cross-sectional area when the first throttle passage 53a is cut by a plane orthogonal to the central axis of the first throttle passage 53a. As described above, in the first chamber chamber 51a, a passage in which the flow resistance is reduced with respect to the first throttle passage 53a is provided on the upstream side and the downstream side of the first throttle passage 53a.

  The upstream protruding wall 53 is provided downstream of the inflow passage 50a so as to intersect with an extension line of the passage center axis of the inflow passage 50a. According to this, the evaporated fuel that has flowed down from the inflow passage 50a to the first chamber chamber 51a collides with the upstream protruding wall 53, then climbs over the tip of the upstream protruding wall 53 and flows down through the first throttle passage 53a. Become. Further, the pulsating flow that flows upstream in the valve-closed state flows along the upstream protruding wall 53 from the downstream side of the upstream protruding wall 53, receives a flow resistance in the first throttle passage 53 a, and flows before flowing into the inflow passage 50 a. After the flow resistance is relaxed, the flow resistance is again received by the inflow passage 50a.

  The chamber chamber forming portion 400 provided in the main body housing 240 has a downstream-side protruding wall 45 that protrudes from the inner wall surface to the upstream end of the second chamber chamber 400a at the upstream end. Since the downstream protruding wall 45 protrudes from a portion of the chamber chamber forming portion 400 that is located on the opposite side of the side where the electromagnetic coil portion 42 is provided, the downstream protruding wall 45 and the chamber chamber forming portion A second throttle passage 45 a is formed between the inner wall surface of 400. The second throttle passage 45a is a passage having a smaller passage cross-sectional area than the first chamber chamber 51a and the second chamber chamber 400a, and provides a flow resistance to the fluid. The passage cross-sectional area of the second throttle passage 45a is a cross-sectional area when the second throttle passage 45a is cut by a plane orthogonal to the central axis of the second throttle passage 45a. As described above, in the second chamber chamber 400a, the first chamber chamber 51a and the second chamber chamber are reduced in the flow resistance with respect to the second throttle passage 45a on the upstream side and the downstream side of the second throttle passage 45a. 400a is provided. The second throttle passage 45a is a connection passage that allows the first chamber chamber 51a and the second chamber chamber 400a to communicate with each other.

  The downstream side protruding wall 45 protrudes from a portion located on the opposite side of the upstream side protruding wall 53 in the chamber chamber forming portion 400. The downstream protruding wall 45 is provided so as to overlap the main body internal throttle passage 402a upstream of the main body internal throttle passage 402a. The downstream side protruding wall 45 is provided downstream of the upstream side protruding wall 53 so that the upstream side protruding wall 53 and the tip end overlap each other. That is, the downstream-side protruding wall 45 and the upstream-side protruding wall 53 are wall portions that protrude in opposite directions, and are provided so that the tips are separated from each other and overlap on the upstream side and the downstream side. According to this, the evaporated fuel that has flowed down the first chamber chamber 51a through the first throttle passage 53a collides with the downstream-side protruding wall 45 and then climbs over the tip of the downstream-side protruding wall 45 and then passes through the second throttle passage 45a. To come down. Further, the pulsating flow that flows upstream in the valve-closed state collides with the downstream protruding wall 45 from the main body internal throttle passage 402a, passes over the tip of the downstream protruding wall 45, and flows down through the second throttle passage 45a. This pulsating flow flows from the downstream side of the downstream side protruding wall 45 along the downstream side protruding wall 45, receives a flow resistance in the second throttle passage 45a, and the flow resistance is relaxed before flowing to the first throttle path 53a. After that, the first throttle passage 53a receives the flow resistance again.

  According to the third embodiment, the purge control valve 204 has a smaller passage cross-sectional area than each of the first chamber chamber 51a and the second chamber chamber 400a, and allows the first chamber chamber 51a and the second chamber chamber 400a to communicate with each other. Has a connecting passage. According to this configuration, the pulsating flow propagating upstream in the valve-closed state is diffused in the second chamber chamber 400a and then subjected to pressure loss by the second throttle passage 45a, and further diffused in the second chamber chamber 400a. Then, pressure loss is again given by the inflow passage 50a. As a result, the pulsation flow is forced to diffuse, contract, diffuse, and contract toward the upstream, so that the purge control valve 204 that contributes to effectively dampening the pulsation can be provided.

  The inflow housing 105 includes an upstream-side protruding wall 53 that protrudes so as to narrow the passage relative to the first chamber chamber 51a. The main body housing 240 includes a downstream projecting wall 45 that projects so as to narrow the passage with respect to the second chamber chamber 400a. According to this, the first projecting passage 53a whose passage cross-sectional area is narrowed in the first chamber chamber 51a is formed by the upstream projecting wall 53, and the passage cross-sectional area is narrowed in the second chamber chamber 400a by the downstream projecting wall 45. A second throttle passage 45a is formed. With these throttle passages, the pulsating flow can be diffused, contracted and diffused upstream in the first chamber chamber 51a in the closed state, and the pulsating flow is diffused, contracted and diffused upstream in the second chamber chamber 400a. Can be performed in order. Therefore, since the pulsating flow is forced to diffuse, contract, and diffuse toward the upstream in each chamber, the purge control valve 204 that contributes to effectively dampening the pulsation can be provided.

  The downstream protruding wall 45 protrudes from the main body housing 240 on the side opposite to the portion of the inflow housing 105 from which the upstream protruding wall 53 protrudes. According to this configuration, the pulsating flow that propagates upstream in the valve-closed state can flow in a meandering manner from the second chamber chamber 400a to the first chamber chamber 51a. Thereby, since the pulsating flow flows down so as to avoid the downstream protruding wall 45 and the upstream protruding wall 53, a purge control valve 204 is provided which contributes to providing a flow resistance to the pulsating flow and effectively attenuating the pulsation. it can.

  Further, the downstream projecting wall 45 projects from the main body housing 240 in a direction in which the valve body 43 is separated from the valve seat 63. According to this configuration, the downstream-side protruding wall 45 has a shape protruding in the direction of movement when the valve body 43 opens, and therefore propagates upstream from the in-housing passage 401a closed by the valve body 43. The pulsating flow is provided at a position where it is likely to collide with the downstream-side protruding wall 45. Thereby, since the pulsating flow propagating to the upstream side is subjected to pressure loss by colliding with the downstream protruding wall 45, an effect of attenuating the pulsation can be obtained.

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

  The purge control valve that can achieve the object disclosed in the specification is not a flow rate adjusting device that is applied only to the evaporated fuel processing system disclosed in the above-described embodiment. For example, the purge control valve can be applied to a system in which the evaporated fuel that has passed through the purge control valve can be introduced into a passage upstream of the supercharger, and purge at the time of supercharging can be performed.

  The purge control valve that can achieve the object disclosed in the specification is not only a device in which the main body housing and the outflow member, which are separate parts, are integrally coupled, but also the main body housing and the outflow member are a single part. The apparatus comprised by these is also included.

  The purge control valve that can achieve the object disclosed in the specification is not limited to the examples shown in the above-described embodiments. Further, the components connected to the purge control valve are not limited to the examples shown in the above-described embodiment.

4, 104, 204 ... purge control valve, 5, 105 ... inflow housing 6 ... outflow member, 16 ... canister, 22 ... engine 40, 140, 240 ... main body housing, 42 ... electromagnetic coil section 43 ... valve body, 44a ... Connection passage 45 ... Downstream-side protruding wall 45a ... Second throttle passage (connection passage), 50 ... Inflow tubular portion (inflow portion)
50a ... Inflow passage, 51a ... First chamber chamber 53 ... Upstream protruding wall, 60 ... Outflow tubular portion (outflow portion), 60a ... Outflow passage 63 ... Valve seat, 400 ... Chamber chamber forming portion, 400a ... Second chamber chamber 401 ... Outlet side tubular part 401a ... Housing internal passage 402 ... Communication wall 402a ... Main body internal throttle passage

Claims (7)

A purge control valve (4; 104; 204) installed in an evaporated fuel passage through which evaporated fuel desorbed from the canister (16) flows toward the engine (22);
An inflow housing (5; 105) having an inflow portion (50) formed with an inflow passage (50a) through which evaporated fuel flowing from the canister side flows;
A main body housing (40; 140; 240) having a built-in electromagnetic coil portion (42) for driving a valve body (43) for opening and closing the in-housing passage (401a) and connected to the inflow housing;
With
The inflow housing has a first chamber chamber (51a) that has a larger passage cross-sectional area than the inflow passage and is provided closer to the main body housing than the inflow passage,
The main body housing is a purge control valve having a second chamber chamber (400a) provided closer to the inflow housing than the valve body. An outflow member (6) having an outflow passage (60) in which an outflow passage (60a) through which the evaporated fuel flowing out from the in-housing passage flows is formed and connected to the main body housing;
The body housing has a chamber chamber forming portion (400) that forms the second chamber chamber, and an outflow side that extends in a direction intersecting the chamber chamber forming portion and is connected to the outflow member. A tubular portion (401), and the inside of the main body housing, between the electromagnetic coil portion and the communication wall portion (402) connecting the chamber chamber forming portion and the outflow side tubular portion. A main body internal throttle passage (402a) is provided,
2. The purge control valve according to claim 1, wherein the inflow passage and the main body internal throttle passage have a passage cross-sectional area that is smaller on the upstream side and the downstream side than the first chamber chamber and the second chamber chamber.   The passage cross-sectional area is smaller than each of the first chamber chamber and the second chamber chamber, and a connection passage (44a; 45a) that connects the first chamber chamber and the second chamber chamber is provided. Or the purge control valve of Claim 2. The inflow housing includes an upstream projecting wall (53) projecting so as to narrow a passage with respect to the first chamber chamber,
The purge control valve according to any one of claims 1 to 3, wherein the main body housing includes a downstream-side protruding wall (45) protruding so as to narrow a passage with respect to the second chamber chamber.   The purge control valve according to claim 4, wherein the downstream projecting wall projects from the main body housing on a side opposite to a portion of the inflow housing from which the upstream projecting wall projects.   The purge control valve according to claim 5, wherein the downstream projecting wall projects from the main body housing in a direction in which the valve body is separated from the valve seat (63).   The purge control valve according to any one of claims 1 to 6, wherein the second chamber chamber has a larger volume than the first chamber chamber.

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