JP2020034054A - Fluid control valve - Google Patents

Abstract

To provide a fluid control valve that reduces a manufacturing cost concerning a contact surface of a valve part and a valve seat part.SOLUTION: A fluid control valve 5 includes a valve part 550b for opening and closing an internal passage 520 so as to be switched between a valve-opening state of admitting the circulation of a working fluid separately from a valve seat part 560b and a valve-closing state of coming in contact with the valve seat part 560b, in which the pressure of the working fluid acts on the direction to open the valve. A plunger 55 is formed by any or multiple combinations of press working, forging, heading, surface pushing, form-rolling and casting where a valve part 550b is constituted and the polishing processing or the cutting processing is not given on the surface of the valve part 550b. A yoke 56 forms a magnetic circuit along with the plunger 55 in energization, and is formed by the previously described machining similar to that of the plunger 55 where the valve seat part 560b is included in a portion, and the polishing processing or the cutting processing is not given on the surface of the valve seat part 560b coming in contact with the valve part 550b.SELECTED DRAWING: Figure 2

Description

  The disclosure herein relates to a fluid control valve.

  Patent Literature 1 discloses a fluid control valve that permits and blocks the flow of fluid flowing out of an engine in an engine cooling circuit. This fluid control valve is kept closed by the urging force of the urging spring and the suction force of the plunger being attracted to the fixed core when the hydraulic pressure of the cooling water is not generated. When the hydraulic pressure of the cooling water exceeds the urging force of the urging spring, the plunger moves in the direction away from the fixed core due to the hydraulic pressure and opens.

Japanese Patent No. 5614585

  The fluid control valve of Patent Literature 1 is brought into a closed state when a plunger comes into contact with an annular distal end surface of a cylindrical fixed core. The annular distal end surface of the fixed core functions as a valve seat surface that comes into contact with a plunger that is a valve portion. In order for the tip surface to function as a valve seat surface, it is necessary to grind or finish the tip surface to ensure the flatness of the tip surface. There is a problem that costs are required.

  In the fluid control valve disclosed in Patent Document 1, when the valve is closed from the open state, the valve cannot be closed even if the solenoid generates magnetic flux depending on the magnitude of the hydraulic pressure of the cooling water acting in the direction opposite to the moving direction of the plunger. There is. Further, in Patent Document 1, in order to ensure the valve closing performance of closing the valve against the pressure of the working fluid, it is necessary to additionally have an urging spring for urging in the valve closing direction. Further, when the urging force of the urging spring is large, there is a concern that it is difficult to shift from the valve-closed state to the valve-opened state when the hydraulic pressure of the cooling water is weakened after the end of energization.

  A first object disclosed in this specification is to provide a fluid control valve that reduces manufacturing cost of a contact surface between a valve portion and a valve seat portion.

  A second object disclosed in this specification is to provide a fluid control valve that improves valve closing performance of closing a valve against the pressure of a working fluid.

  The embodiments disclosed in this specification employ different technical means from each other in order to achieve the respective objects. Further, the reference numerals in the parentheses described in the claims and this section are examples showing the correspondence with specific means described in the embodiment described below as one aspect, and limit the technical scope. is not.

  One of the disclosed fluid control valves includes a housing (52) having an internal passage (520) through which a working fluid, which is a liquid, flows, and a working fluid flowing away from a valve seat (560b; 566b; 1560b). A valve section (550b; 552b; 1550b) in which an internal passage is opened and closed so as to switch between a valve open state and a valve closed state, and pressure of a working fluid acts in a valve opening direction, and a valve section, A plunger (55; 155; 255; 355) formed by any or a combination of press working, forging, forging, face pressing, rolling, and casting, wherein the surface of the valve portion is not subjected to a polishing treatment or a cutting treatment. A coil portion (540) for generating a magnetic force for driving the plunger in the axial direction when energized; and forming a magnetic circuit together with the plunger when energized, and a valve seat part provided in a part to contact the valve portion. A yoke (56; 156; 256) formed by any or a combination of press working, forging, forging, face pressing, rolling, and casting, wherein the surface of the valve seat portion is not subjected to polishing or cutting. , Is provided.

  According to the fluid control valve, the plunger and the yoke are not subjected to the polishing process or the cutting process for the valve portion and the valve seat portion. According to the plunger and the yoke having this configuration, the valve portion and the valve seat can exhibit the valve-closing performance as a fluid control valve without performing a polishing process or a cutting process on the contact surface between the valve portion and the valve seat portion. The contact surface of the part can be obtained. As described above, according to this fluid control valve, it is possible to reduce the manufacturing cost of the contact surface between the valve section and the valve seat section.

  One of the disclosed fluid control valves includes a housing (52) having an internal passage (520) through which a working fluid, which is a liquid, flows, and a working fluid flowing away from a valve seat (560b; 566b; 1560b). (550b; 552b; 1550b) in which an internal passage is opened and closed so as to switch between a valve opening state and a valve closing state, and the pressure of the working fluid acts in a valve opening direction, and a shaft comprising the valve section (55; 155; 255; 355), a coil part (540) for generating a magnetic force for driving the plunger in the axial direction when energized, and a position axially opposed to the valve part. A yoke (56; 156; 256) having a valve seat portion and forming a magnetic circuit together with the plunger when energized, and a first path (565, 5) which is a magnetic path through which magnetic flux passes between the plunger and the yoke. 2; 551, 561; 552, 563a) and a second path (550, 560; 552, 564; 552, 566) which is a magnetic path through which a magnetic flux passes between the plunger and the yoke at a portion different from the first path. 1550, 1560), when the energization is started in the valve open state, the first path forms a magnetic path in which the magnetic flux is larger than the second path, and in the valve closed state, the second path is the first path. A magnetic path where the magnetic flux is larger than the path is formed.

  According to this fluid control valve, at the start of energization, the plunger can be started to be sucked against the fluid pressure by using the driving force generated by the magnetic path passing through the first path having a larger magnetic flux than the second path. . Further, in the process from the valve opening state to the valve closing state, the valve of the plunger is maintained so as to maintain the valve closing state by using the driving force generated by the magnetic path passing through the second path where the magnetic flux is larger than the first path. The part can be adsorbed to the valve seat part of the yoke. In this way, the magnetic path passing through the first path becomes dominant at the start of energization in the valve-open state, so that the plunger exerts a suction force to attract the plunger toward the valve seat side, thereby resisting the pressure of the working fluid. A driving force for moving the valve section can be obtained. In the closed state, the magnetic path passing through the second path becomes dominant, so that the internal passage can be shut off by exerting the suction force for maintaining the valve portion in contact with the valve seat. As described above, it is possible to provide a fluid control valve that improves the valve closing performance of closing the valve against the pressure of the working fluid.

  Furthermore, since the valve closing operation from the open state and the maintenance of the valve closing state can be compatible without relying on the biasing force of a spring or the like, it is possible to suppress an increase in the size of the device due to the provision of the spring and the strengthening of the biasing force. Can be. Further, since the plunger and the yoke have the functions of the valve portion and the valve seat portion, there is no need to provide a separate valve body, and the number of parts and the number of parts management steps can be reduced.

It is a lineblock diagram showing the cooling water circuit concerning a 1st embodiment. It is sectional drawing which showed the valve-open state about the fluid control valve of 1st Embodiment. It is sectional drawing which showed the valve-closing state about the fluid control valve of 1st Embodiment. It is the elements on larger scale which showed the magnetic path between the yoke and the plunger of the outflow port side in a valve closed state. FIG. 9 is a characteristic diagram illustrating a relationship between a stroke and a suction force for a first path and a second path. It is the elements on larger scale which showed the magnetic path between the yoke of the inflow port side, and the plunger in the valve-open state about the fluid control valve of 2nd Embodiment. It is the elements on larger scale which showed the magnetic path between the inflow port side yoke and the plunger in the valve-closing state about the fluid control valve of 2nd Embodiment. It is sectional drawing which showed the valve-open state about the fluid control valve of 3rd Embodiment. It is sectional drawing which showed the valve-closing state about the fluid control valve of 3rd Embodiment. It is the elements on larger scale which showed the magnetic path between the yoke and the plunger of the outflow port side in a valve closed state. It is a perspective view of a plunger in a 3rd embodiment. It is the top view which looked at the plunger in a 3rd embodiment from the outflow port side. It is sectional drawing which showed the valve-closing state about the fluid control valve of 4th Embodiment. It is the elements on larger scale which showed the magnetic path between the yoke and the plunger of the outflow port side in a valve closed state. It is a perspective view of a plunger in a 5th embodiment. It is the top view which looked at the plunger in a 5th embodiment from the outflow port side. It is sectional drawing which showed the valve-open state about the fluid control valve of 6th Embodiment. It is sectional drawing which showed the valve closed state about the fluid control valve of 6th Embodiment.

  Hereinafter, a plurality of embodiments for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, portions corresponding to the items described in the preceding embodiment are denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each embodiment, the other embodiments described above can be applied to other parts of the configuration. Not only the combination of the parts that clearly indicate that a combination is possible in each embodiment, but also the embodiments can be partially combined without being specified, unless there is any particular problem with the combination. It is also possible.

(1st Embodiment)
A fluid control valve that achieves the object of the disclosure has a valve closing direction in which the direction opposite to the direction in which the pressure of the working fluid flowing inside acts is a valve closing direction. It is a device for switching. The working fluid controlled by the fluid control valve is a liquid such as water or oil.

  A first embodiment that discloses an example of a fluid control valve will be described with reference to FIGS. The fluid control valve 5 of the first embodiment is used in a cooling water circuit 1 using a liquid as a working fluid. The cooling water circuit 1 is a circuit through which engine cooling water circulates, and has a function of efficiently warming up and cooling the engine 2 provided in the vehicle. As shown in FIG. 1, the cooling water circuit 1 includes an engine 2, a pump 3, a first flow path 10, a second flow path 11, a third flow path 12, a switching valve 4, a heater core 6, a fluid control valve 5, a radiator. 7, a control device 8 and the like.

  The cooling water flows out of the pump 3, flows through the engine 2, the first flow path 10, the second flow path 11, and the third flow path 12, and returns to the pump 3. The control device 8 has at least one arithmetic processing device and at least one memory device as a storage medium for storing programs and data. The control device 8 is provided by, for example, a microcomputer including a storage medium readable by a computer. The storage medium is a non-transitional substantial storage medium that temporarily stores a computer-readable program. The storage medium can be provided by a semiconductor memory, a magnetic disk, or the like. The controller 8 may be provided by a single computer or a set of computer resources linked by a data communication device. The program, when executed by the control device 8, causes the control device 8 to function as the device described in this specification and causes the control device 8 to function to execute the method described in this specification. In the control device 8, a functional unit for performing various processes for warming up and cooling the engine 2 is configured by hardware and / or software.

  The pump 3 is a device that works in conjunction with the operation of the engine 2 so as to drive the cooling water when the engine 2 is in an operating state. The pump 3 operates when the engine 2 is in the operating state to circulate the cooling water, and does not operate when the engine 2 is in the stopped state. As the pump 3, for example, a mechanical variable flow rate type pump that operates by rotation of an engine is used. The pump 3 may be a device that uses an electric motor as a drive source and that can be started and stopped independently of the operation state of the engine 2. In this case, the pump 3 can change the amount of the fluid to be discharged under the control of the control device 8.

  The first flow path 10 circulates the fluid through the engine 2, the switching valve 4 and the pump 3 without passing through the heater core 6 or the radiator 7 so that the fluid flowing out of the engine 2 flows into the engine 2 via the pump 3. Channel. Inside the engine 2, a flow path through which cooling water flows is formed. The cooling water flowing inside the engine 2 absorbs the heat of the engine 2 and raises its own temperature, thereby lowering the internal temperature of the engine 2. The second flow path 11 branches the cooling water flowing out of the engine 2 from the upstream part of the first flow path 10 and returns the cooling water to the downstream part of the first flow path 10 via the fluid control valve 5 and the heater core 6. Road. The fluid control valve 5 and the heater core 6 are provided in the second flow path 11. The third flow path 12 is a flow path that branches off from the upstream part of the second flow path 11 that is on the upstream side of the fluid control valve 5 and returns to the downstream part of the first flow path 10 via the radiator 7. .

  The third flow path 12 is provided with a radiator 7. The switching valve 4 is provided at a junction where the third flow path 12 is connected to the first flow path 10 on the downstream side. The switching valve 4 is configured so that the flow path of the cooling water flowing out of the engine 2 can be switched between a first state, a second state, and a third state. The first state is a state in which the first flow path 10 and the third flow path 12 are not connected so that the cooling water circulates in the first flow path 10. The second state is a state in which the third flow path 12 and the passage on the engine side are connected by the switching valve 4 so that the cooling water returns to the engine 2 via the third flow path 12. The third state is a state in which all three passages connected in the switching valve 4 are opened. The switching valve 4 is a device that switches the flow path to the third state when the cooling water satisfies a predetermined temperature condition, and switches the flow path to the first state when the predetermined temperature condition is not satisfied, for example, a thermostat valve Can be configured by That is, the opening degree of the switching valve 4 changes according to the amount of heat (cooling water temperature) added to the temperature-sensitive wax.

  The fluid control valve 5 is provided upstream or downstream of the heater core 6 in the second flow path 11 and is a valve that can switch its opening degree between a closed state and an open state. When the fluid control valve 5 is in the closed state, the cooling water flows only in the first flow path 10 without flowing in the second flow path 11 in the first state, and flows only in the third flow path 12 in the second state. When the fluid control valve 5 is in the open state, the cooling water flows in both the first flow path 10 and the second flow path 11 in the first state. As described above, the second flow path 11 and the third flow path 12 are configured in parallel with the first flow path 10.

  The control device 8 controls the fluid control valve 5 based on the temperature of the cooling water detected by the cooling water temperature sensor. When the cooling water temperature is lower than the predetermined first temperature after the engine 2 is started, the switching valve 4 maintains the first state, and the control device 8 controls the fluid control valve 5 to be closed. Since the cooling water circulates only in the first flow path 10, warming up of the engine 2 is promoted.

  When the cooling water temperature becomes equal to or higher than the first temperature, the warm-up control of the engine 2 ends. When the cooling water temperature becomes equal to or higher than a second temperature set higher than the first temperature, the switching valve 4 switches the cooling water to the second state or the third state, and the cooling water circulates through the third flow path 12 and passes through the radiator 7. The cooling water is radiated. When energization is cut off by the control device 8 and the fluid control valve 5 is controlled to the open state, the cooling water circulates through the second flow path 11, and the cooling water is radiated also in the heater core 6. Further, in the first state, if heat radiation from the cooling water is necessary in the heater core 6, the power may be cut off by the control device 8 and the fluid control valve 5 may be controlled to the open state.

  Further, as another embodiment, even if the cooling water circuit 1 described above does not include the first flow path 10 that forms a path for returning the fluid flowing out of the engine 2 to the engine without passing through the heater core 6 or the radiator 7. Good. The switching valve 4 may be configured to switch the flow path of the cooling water circuit 1 so as not to execute the second state. The control device 8 may be configured to control the fluid control valve 5 based on a detection value of a sensor that detects an engine oil temperature or an oil temperature of a transmission or the like.

  Next, the fluid control valve 5 will be described with reference to FIGS. FIG. 2 shows the valve open state, and FIG. 3 shows the valve closed state. The fluid control valve 5 includes a plunger 55 as a movable core having a valve portion 550b, a yoke 56 having a valve seat 560b as a seat valve, an electromagnetic solenoid portion 54, and the like. The fluid control valve 5 is an electromagnetic valve device having a configuration in which the pressure of the working fluid acts on a valve opening direction in which the valve section 550b is separated from the valve seat section 560b. That is, the fluid control valve 5 is an electromagnetic valve device in which the valve closing direction of the valve section 550b is set in a direction against the fluid pressure. The fluid control valve 5 opens and closes an internal passage 520 provided in the housing according to a state of balance between a fluid pressure received from the working fluid and a magnetic force generated by energization. The internal passage 520 forms a passage having the upstream opening 560 a of the yoke 56 as an inlet inside the intermediate housing 52.

  The plunger 55 has a shape in which one end in the axial direction is closed, and is a cup-shaped body whose other end is open. The plunger 55 includes an upstream panel 550 provided on the inflow port 510 side, a downstream annular section 552 provided on the outflow port 530 side, and a tube connecting the upstream panel 550 and the downstream annular section 552. 551. The upstream panel 550 has an outer diameter approximately equal to that of the cylindrical portion 551, and includes a valve portion 550b seated on the valve seat portion 560b on a surface located on the inflow port 510 side. The upstream-side panel portion 550 is provided on the plunger 55 upstream of the cylindrical portion 551, and corresponds to a plunger-side panel portion having a flat surface. The valve portion 550b is provided at a position facing the valve seat portion 560b provided as a part of the yoke 56 in the plunger 55. The axial direction is the direction in which the plunger 55 moves. The upstream panel portion 550 is provided such that at least the valve portion 550b forms a surface orthogonal to the axial direction. Further, the upstream-side panel portion 550 is provided such that at least the valve portion 550b forms a plane parallel to the valve seat portion 560b.

  The plunger 55 is made of, for example, a magnetic material. The valve section 550b may be formed of a magnetic material. The plunger 55 is a member in which the surface of the valve portion 550b has not been subjected to polishing or cutting. In the press working at the time of manufacturing the plunger 55, the sheet material is formed by drawing and bending. The plunger 55 is a member formed by either forging or rolling. Forging or rolling is a processing technique of shaping a material into a predetermined shape by compressive force without cutting the material, so that the plunger 55 that has not been subjected to polishing or cutting on the surface of the valve portion 550b can be formed. . The plunger 55 is formed by any one of press working, forging, forging, face pressing, rolling, casting, or a combination of any of these, in which the surface of the valve portion 550b is not subjected to polishing or cutting. It is a member. The surface of the valve portion 550b is constituted by the surface of a plate material formed parallel to the valve seat portion 560b. By such molding, the surface of the valve portion 550b capable of securing the valve-closing performance with the valve seat portion 560b can be formed without performing finishing such as polishing or cutting on the surface of the valve portion 550b after molding. Can be.

  The downstream annular portion 552 is a flange-like portion having an outer diameter larger than that of the tubular portion 551 and having a shape radially spreading perpendicular to the tubular portion 551. A downstream passage 552a located closer to the outside of the diameter than the cylindrical portion 551 passes through the downstream annular portion 552 in the axial direction. A plurality of downstream passages 552a are provided in the downstream annular portion 552 in a circumferential direction. The downstream passage 552a communicates with the communication passage 521 provided around the cylindrical portion 551 on the upstream side, and communicates with the outflow port 530 on the downstream side. The communication passage 521 is a passage provided inside the intermediate housing 52 and communicates with the internal passage 520 on the upstream side. The communication passage 521 is a fluid passage through which the working fluid flows outside the plunger 55 and inside the coil portion 540. Thus, the internal passage 520, the communication passage 521, and the downstream passage 552a constitute a passage that connects the inflow port 510 and the outflow port 530.

  The plunger 55 is supported slidably in the axial direction with at least the downstream annular portion 552 inserted in the second tubular portion 565 located at the downstream end of the yoke 56. Further, the plunger 55 may be slidable in the axial direction by a configuration in which at least the cylindrical portion 551 is partially supported by a sliding support portion provided inside the bobbin 541. The sliding support portion is formed of a non-magnetic material similarly to the bobbin 541.

  The housing body forming the fluid passage in the fluid control valve 5 includes an inflow side housing 51 provided with an inflow port 510 as an inflow passage into which a working fluid flows, and an outflow side housing provided with an outflow port 530 as an outflow passage. 53 and an intermediate housing 52. The intermediate housing 52 connects the inflow side housing 51 and the outflow side housing 53. The inflow side housing 51 has a flange portion provided at the downstream end portion integrally connected to the intermediate housing 52.

  The outflow side housing 53 has a flange portion provided at the upstream end portion integrally connected to the intermediate housing 52. The inflow side housing 51, the intermediate housing 52, and the outflow side housing 53 are formed of a resin material, and are welded and joined at a joint.

  The intermediate housing 52 contains a yoke 56, a plunger 55, a coil unit 540, a bobbin 541, and the like. The yoke 56 is made of, for example, a magnetic material, like the plunger 55. The valve seat 560b may be formed of a magnetic material. The yoke 56 constitutes a part of a magnetic circuit, and supports the bobbin 541 and the plunger 55 inside the intermediate housing 52. The yoke 56 is provided so as to cover the outer peripheral sides of the bobbin 541 and the coil portion 540. The yoke 56, the plunger 55, the coil unit 540, the bobbin 541, and the sliding support unit are installed so that their axes are coaxial.

  The electromagnetic solenoid unit 54 includes a yoke 56, a coil unit 540, a bobbin 541, a sliding support unit, a connector, and the like. The connector is provided so as to be located on the side or outside of the yoke 56. The connector is provided to energize the coil unit 540, and an internal terminal terminal is electrically connected to the coil unit 540. The electromagnetic solenoid unit 54 can control a current flowing through the coil unit 540 by electrically connecting a terminal terminal to a current control device or the like by a connector. The bobbin 541 is formed in a cylindrical shape from a resin material, and a coil portion 540 is wound around the outer peripheral surface. When the coil unit 540 is energized, the generated magnetic flux forms a magnetic circuit that circulates through the yoke 56 and the plunger 55.

  The yoke 56 is a cylindrical body whose both ends in the axial direction are open. The yoke 56 has an upstream first annular portion 560 provided on the inflow port 510 side, an inclined portion 561 that is inclined with respect to the axis of the plunger 55, and extends radially outward from the downstream end of the inclined portion 561. And a second annular portion 562. The yoke 56 further includes a first tubular portion 563 extending in the axial direction from the outer peripheral edge of the second annular portion 562, a second tubular portion 565 having a sectional shape extending in the axial direction at the downstream end, and a first tubular portion 565. A downstream side annular portion 564 connecting the tubular portion 563 and the second tubular portion 565 is provided. The downstream annular portion 564 radially extends radially outward from the downstream end of the first tubular portion 563 and is integrated with the second tubular portion 565 on the outer peripheral side.

  The first annular portion 560 is provided on the yoke 56 on the upstream side of the inclined portion 561, and corresponds to a yoke side panel portion having a flat surface. The inclined portion 561 is a tubular portion having an upstream end connected to the first annular portion 560 and a downstream end connected to the second annular portion 562. The inclined portion 561 is a portion having a sectional shape inclined with respect to the cylindrical portion 551 of the plunger 55. Hereinafter, the cross-sectional shape related to the inclined portion and the parallel portion refers to a vertical cross-sectional shape along the axial direction of the plunger 55 and the like. The slope 561 is formed such that the upstream end has a smaller outer diameter than the downstream end. Therefore, the inclined portion 561 is inclined with respect to the tubular portion 551 such that the diameter increases as it goes downstream. The upstream end of the inclined portion 561 is configured to have a larger diameter dimension than the cylindrical portion 551.

  The first annular portion 560 is capable of contacting the upstream side plate portion 550 of the plunger 55, has a larger diameter dimension than the upstream side plate portion 550, and has a through hole formed in the upstream side opening portion 560a formed coaxially with the plunger 55. As The first annular portion 560 and the upstream-side panel portion 550 are parallel portions that are axially opposed portions and have a cross-sectional shape along each other.

  The first annular portion 560 includes a valve seat portion 560b that contacts the valve portion 550b on a surface located on the downstream side. The first annular portion 560 is provided such that at least the valve seat portion 560b forms a surface orthogonal to the axial direction. Further, the upstream-side panel portion 550 is provided such that at least the valve portion 550b forms a plane parallel to the valve seat portion 560b. The valve seat portion 560b is provided at a position facing the valve portion 550b provided as a part of the plunger 55 in the yoke 56. In the valve closed state, the valve seat portion 560b is a portion of the first annular portion 560 that is in contact with the valve portion 550b so as to form an annular surface or an annular line outside the upstream opening 560a.

  The yoke 56 is a member formed by press working in which the surface of the valve seat 560b is not subjected to polishing or cutting. In the pressing at the time of manufacturing the yoke 56, the sheet material is formed by drawing and bending. The yoke 56 is a member formed by either forging or rolling. Forging or rolling is a processing technique for forming a material into a predetermined shape by a compressive force without cutting the material, so that the surface of the valve seat 560b can be formed with the yoke 56 that is not subjected to polishing or cutting. Like the plunger 55, the yoke 56 is formed by pressing, forging, forging, pressing, rolling, casting, or any of these, in which the surface of the valve seat 560b is not polished or cut. It is a member formed by a plurality of combinations. The surface of the valve seat 560b is constituted by the surface of a plate formed parallel to the valve 550b. By such molding, the surface of the valve seat portion 560b capable of ensuring the valve closing performance with the valve portion 550b is formed without performing a finishing process such as a polishing process or a cutting process on the surface of the valve seat portion 560b after the molding. be able to.

  The method of manufacturing the fluid control valve 5 includes a step of installing the electromagnetic solenoid unit 54 including the coil unit 540, the bobbin 541, and the yoke 56 in the intermediate housing 52, and a step of installing the plunger 55 inside the electromagnetic solenoid unit 54. Prepare. The method of manufacturing the fluid control valve 5 further includes a step of connecting the inflow side housing 51 and the outflow side housing 53 to the intermediate housing 52 in which the electromagnetic solenoid portion 54 and the plunger 55 are installed. Further, when one of the inflow side housing 51 and the outflow side housing 53 constitutes a single housing integrally formed with the intermediate housing 52, the manufacturing method of the fluid control valve 5 is a single method. A step of coupling the other housing to the other housing.

  The fluid control valve 5 forms a first path which is a magnetic path through which a magnetic flux passes between the plunger 55 and the yoke 56 on the downstream side when energized in the valve open state shown in FIG. The fluid control valve 5 forms a second path that is a magnetic path through which a magnetic flux passes between the plunger 55 and the yoke 56 on the upstream side and the downstream side when power is supplied in the closed state shown in FIG. The second path is a magnetic path in which a magnetic flux passes between the plunger 55 and the yoke 56 at a portion different from the first path. The second path formed on the upstream side is a magnetic path through which a magnetic flux passes between the upstream panel 550 and the first annular section 560, and is a path passing through the valve section 550b and the valve seat section 560b. The second path formed on the downstream side is a magnetic path through which magnetic flux passes between the second cylindrical portion 565 and the downstream annular portion 552.

  As shown in FIG. 2, when current is being supplied in the valve-open state, at the downstream ends of the plunger 55 and the yoke 56, the magnetic flux flows through the first path between the downstream annular portion 552 and the second cylindrical portion 565. Passes. In the valve-open state, the distance between the plunger 55 and the yoke 56 on the downstream side is the shortest between the downstream annular portion 552 and the second cylindrical portion 565.

  When the valve is closed from the open state shown in FIG. 2 to the closed state shown in FIGS. 3 and 4, a reversal phenomenon occurs in which the second path is more dominant than the first path. This is because the downstream-side annular portion 552 and the downstream-side annular portion 564 that constitute parallel portions are in contact with each other, or are closest between the plunger 55 and the yoke 56 on the downstream side. On the downstream side, between the downstream annular portion 552 and the downstream annular portion 564 is a portion having the smallest magnetic resistance and a portion having the largest magnetic flux. In the valve-closed state, the second path through which the magnetic flux passes between the upstream panel portion 550 and the first annular portion 560 further becomes dominant at the upstream end portions of the plunger 55 and the yoke 56. The reason why the second path becomes dominant is that the upstream side panel portion 550 and the first annular portion 560 constituting the parallel portion are in contact with each other, or the most upstream portion between the plunger 55 and the yoke 56 on the upstream side. This is because they are close to each other.

  As described above, in the fluid control valve 5, the suction force of the plunger 55 is larger in the second path than in the first path immediately before the valve closing state where the stroke is small similarly to the characteristic diagram shown in FIG. 5 on the downstream side. To change. The fluid control valve 5 has a configuration in which the valve portion 550b is adsorbed to the valve seat portion 560b by the second path on both the upstream side and the downstream side, so that the valve portion 550b is actuated against the fluid pressure acting on the valve portion 550b. The valve can be seated on the valve seat 560b, and the suction holding force at the time of closing the valve can be enhanced.

  As shown in FIG. 5, the suction force for sucking the plunger 55 is larger in the first path than in the second path during the period from the valve-open state to the valve-closed state, and a reversal phenomenon occurs immediately before the valve-closed state. Therefore, there is a characteristic that the second path is larger than the first path in the valve closed state. As shown in FIG. 2, in the valve-open state at the time of energization, the first path becomes a more dominant magnetic path than the second path. This is because, between the plunger 55 and the yoke 56, the distance between the downstream annular portion 552 and the second cylindrical portion 565 is the shortest, the magnetic resistance is the smallest, and the magnetic flux is the largest. is there. Therefore, in the fluid control valve 5, as in the characteristic diagram of FIG. 5, in the valve open state in which the stroke is large, the suction force for sucking the plunger 55 is larger in the first path than in the second path. Therefore, the fluid control valve 5 can suck the plunger 55 against the fluid pressure acting on the valve portion 550b by adopting a configuration in which suction starts in the first path, and enhances the suction performance at the start of energization. it can.

  As the valve closes from the open state shown in FIG. 4 to the closed state, the fluid control valve 5 increases the suction force of the plunger 55 in the second path immediately before the valve close state with a small stroke, as in the characteristic diagram of FIG. Change to be larger. Accordingly, the fluid control valve 5 employs a configuration in which the valve portion 550b is attracted to the valve seat portion 560b by the second path, thereby enhancing the suction holding force when the valve is closed against the fluid pressure acting on the valve portion 550b. can do. As described above, the fluid control valve 5 provides an electromagnetic valve having advantageous characteristics relating to the suction force of both the first path and the second path shown in FIG.

  Next, the operation and effect provided by the fluid control valve 5 of the first embodiment will be described. The fluid control valve 5 opens and closes the internal passage 520 so as to switch between a valve open state and a valve closed state in which the fluid control valve 5 is separated from the valve seat portion 560b to allow the flow of the working fluid, and the pressure of the working fluid is increased in the valve opening direction. An operating valve section 550b is provided. The fluid control valve 5 includes a plunger 55, a coil portion 540 that generates a magnetic force that drives the plunger 55 in the axial direction when energized, and a yoke 56 that forms a magnetic circuit with the plunger 55 when energized. The plunger 55 partially includes a valve portion 550b. The plunger 55 is formed by any one of, for example, press working, forging, forging, face pressing, rolling, casting, or a combination in which the surface of the valve portion 550b is not subjected to polishing or cutting. The yoke 56 partially includes a valve seat 560b. The yoke 56 is formed by pressing, forging, forging, face pressing, rolling, casting, or any of these, in which the surface of the valve seat portion 560b in contact with the valve portion 550b is not polished or cut. It is formed by a plurality of combinations.

  According to the fluid control valve 5, the plunger 55 and the yoke 56 in which the valve portion 550b and the valve seat portion 560b are not subjected to polishing or cutting are provided. According to the plunger 55 and the yoke 56 having this configuration, it is possible to provide a contact surface between the valve portion 550b and the valve seat portion 560b that can exhibit the valve closing performance as the fluid control valve 5. Thus, the fluid control valve 5 that satisfies the required valve-closing performance can be provided without performing polishing or cutting on the surface of the valve portion 550b and the surface of the valve seat portion 560b. According to the fluid control valve 5, the manufacturing cost of the contact surface between the valve portion 550b and the valve seat portion 560b can be reduced.

  The fluid control valve 5 includes a first path, which is a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56, and a magnetic path, through which magnetic flux passes between the plunger 55 and the yoke 56 at a portion different from the first path. And a certain second path. At the start of energization in the valve open state, the first path forms a magnetic path in which the magnetic flux is larger than the second path, and in the valve closed state, the second path has a larger magnetic flux than the first path. Form a magnetic path.

  According to the fluid control valve 5, at the start of energization, the plunger 55 starts to be sucked against the fluid pressure by using the driving force generated by the magnetic path passing through the first path having a larger magnetic flux than the second path. Can be. Further, in the process from the valve opening state to the valve closing state, the valve portion 550b is attracted to the valve seat portion 560b by utilizing a driving force generated by a magnetic path passing through a second path having a larger magnetic flux than the first path, The closed state can be maintained. In this way, the magnetic path passing through the first path becomes dominant at the start of energization in the valve open state, so that the plunger 55 exerts a suction force for suctioning the plunger 55 toward the valve seat portion 560b, thereby resisting the pressure of the working fluid. A driving force for moving the valve portion 550b in the direction can be obtained. In the closed state, the magnetic path passing through the second path becomes dominant, so that the internal path 520 can be kept closed by exerting the suction force for maintaining the valve section 550b in contact with the valve seat section 560b. it can. As described above, the fluid control valve 5 can improve the valve closing performance of closing the valve against the pressure of the working fluid.

  Furthermore, since the valve closing operation from the valve open state and the maintenance of the valve closed state can both be achieved without relying on the biasing force of a spring or the like, it is possible to suppress an increase in the size of the device due to the provision of the spring or the strengthening of the biasing force. . In the fluid control valve 5, since the plunger 55 and the yoke 56 have the functions of the valve portion 550b and the valve seat portion 560b, it is not necessary to provide a separate valve body, and the number of parts and the number of parts management steps can be reduced.

  Since the fluid control valve 5 has a configuration in which a magnetic circuit is formed by the plunger 55 and the yoke 56, the fluid control valve 5 contributes to a reduction in the number of parts of the device and can further suppress an air gap in the magnetic circuit.

  The fluid control valve 5 may be controlled to the maximum voltage at the start of energization (at the start of suction) in the valve open state, and may be controlled to a voltage lower than at the start of suction at the time of suction holding in the valve closed state. When this control is adopted, the fluid control valve 5 that can satisfy the start of suction and the suction holding even when the energization voltage is suppressed can be provided by the configuration including the first path and the second path described above.

  The valve portion 550b and the valve seat portion 560b are provided in a parallel portion forming a second path in a closed state. According to this configuration, the valve portion 550b and the valve seat portion 560b are provided in the parallel portion where the overlapping area or contact area between the plunger 55 and the yoke 56 is large and the second path where the magnetic flux is large is formed. Therefore, it is possible to provide the fluid control valve 5 having a valve function at a portion where the attraction force by the electromagnetic force acts, and it is possible to enhance the shutoff performance of the valve.

  In the fluid control valve 5, the second path is set to a plurality of portions. It is preferable that at least one of the second paths set in the plurality of portions is formed in a portion where the plunger 55 and the yoke 56 come into contact in the valve closed state. According to this configuration, since at least one of the plurality of second paths is provided at a position where the plunger 55 and the yoke 56 are in contact with each other, the valve portion 550b is closed against fluid pressure acting on the valve portion 550b. An attraction force that can maintain the valve state can be provided, and the attraction and holding force when the valve is closed can be enhanced.

  The fluid control valve 5 includes a fluid passage through which the working fluid flows outside the plunger 55 and inside the coil portion 540. According to this configuration, it is possible to provide the fluid control valve 5 that can reduce heat generation from the coil portion 540 and the plunger 55 due to energization by the working fluid flowing between the two.

  The second path is preferably formed at a position where the plunger 55 and the yoke 56 come into contact with each other when the valve is closed. According to this configuration, the fluid control valve 5 is provided with the second path at a position where the plunger 55 and the yoke 56 are in contact with each other, so that the valve state of the valve unit 550b is closed with respect to the fluid pressure acting on the valve unit 550b. Sustainable suction force can be provided, and suction holding force when the valve is closed can be enhanced.

(2nd Embodiment)
The second embodiment will be described with reference to FIGS. The fluid control valve 5 according to the second embodiment is formed such that the first path is more dominant than the second path when the yoke 56 and the plunger 55 are energized in the open state, compared to the first embodiment. Is different. Configurations, operations, and effects that are 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 annular portion 562 is a flange-shaped portion having a diameter larger than the downstream end of the inclined portion 561 and radially expanding in a direction perpendicular to the first cylindrical portion 563. The second annular portion 562 has a cross-sectional shape parallel to the first annular portion 560. The inner peripheral surface of the first cylindrical portion 563 is in a positional relationship facing the outer peripheral edge of the downstream annular portion 552 in the axial direction in the valve closed state and the valve open state.

  The cylindrical portion 551, particularly its upstream portion, is provided such that the distance from the inclined portion 561 gradually decreases as the valve moves from the valve-opening state shown in FIG. 6 to the valve-closing state shown in FIG.

  In the fluid control valve 5 of the second embodiment, as shown in FIG. 6, in the valve open state at the time of energization, the first path indicated by the solid line arrow becomes a more dominant magnetic path than the second path indicated by the broken line arrow. Become. This is because, between the plunger 55 and the yoke 56, the inclined portion 561 and the cylindrical portion 551 have the shortest distance, have the smallest magnetic resistance, and have the largest magnetic flux. At the start of energization in the valve-open state, as shown in FIG. 6, the distance between the plunger 55 and the yoke 56 on the upstream side is the shortest between the inclined portion 561 and the cylindrical portion 551. For this reason, in the fluid control valve 5, as in the characteristic diagram shown in FIG. 5 described above, the suction force for sucking the plunger 55 in the first path is larger than that in the second path in the open state. The fluid control valve 5 can suck the plunger 55 against the fluid pressure acting on the valve portion 550b by adopting a configuration that starts sucking in the first path, and can enhance the suction performance at the start of energization.

  As the valve closes from the open state shown in FIG. 6 to the closed state shown in FIG. 7, a reversal phenomenon occurs in which the second path is more dominant than the first path. This is because the upstream side panel portion 550 and the first annular portion 560 that constitute parallel portions on the upstream side are in contact with each other, or are closest to each other between the plunger 55 and the yoke 56. The fluid control valve 5 of the second embodiment provides an electromagnetic valve having advantageous characteristics relating to the suction force of both the first path and the second path shown in FIGS. 6 and 7. As described above, at the start of energization in the valve-open state, the first path forms a magnetic path in which the magnetic flux is larger than the second path, and in the valve-closed state, the second path is greater than the first path. Form a magnetic path where the magnetic flux increases.

  According to the second embodiment, the first path on the upstream side is a part of one of the plunger 55 and the yoke 56 and an inclined part having a sectional shape inclined with respect to the other part of the plunger 55 and the yoke 56. This is a magnetic path through which a magnetic flux passes between the other portion. The second path on the upstream side is a magnetic path in which the magnetic flux passes through parallel portions having a cross-sectional shape that are axially opposed portions of each of the plunger 55 and the yoke 56 and that are parallel to each other. The parallel portion is constituted by an upstream panel 550 of the plunger 55 and a first annular portion 560 of the yoke 56.

  According to this configuration, by providing the plunger 55 and the yoke 56 with an inclined portion that is inclined with respect to the other part, the plunger 55 and the yoke 56 have a slope that is smaller than the second path that passes through the parallel portion of the plunger 55 and the yoke 56 when power is started in the valve-open state. A first path having a large magnetic flux can be formed. Further, by forming the second path by the parallel portion in the process from the valve opening state to the valve closing state, the overlapping area or contact area between the plunger 55 and the yoke 56 can be increased. For this reason, the fluid control valve 5 that enhances the holding force for maintaining the valve closed state by the second path that can increase the magnetic flux can be provided.

  The plunger 55 has a cylindrical portion 551 extending in the axial direction, and the yoke 56 has an inclined portion 561 having a sectional shape inclined with respect to the cylindrical portion 551. The parallel portion is a plunger side plate provided on the plunger 55 upstream of the working fluid from the cylindrical portion 551, and a yoke side plate provided on the yoke 56 upstream of the working fluid from the inclined portion 561. Unit. According to this configuration, since the yoke 56 includes the inclined portion 561 that is inclined with respect to the cylindrical portion 551 of the plunger 55, the magnetic flux is more generated than the second path passing through the above-described parallel portion at the start of energization in the valve-open state. A large first path can be formed. With this configuration relating to the yoke 56 and the plunger 55, it is possible to provide the fluid control valve 5 that exerts a suction force that attracts the plunger 55 to the yoke 56 at the start of energization in the valve open state.

  According to the fluid control valve 5 having this configuration, since the inclined portion 561 with respect to the cylindrical portion 551 of the plunger 55 is provided on the yoke 56, the inner diameter of the cylindrical portion 551 can be increased. Accordingly, when a configuration in which a fluid passage is provided inside the tubular portion 551 is adopted as in a sixth embodiment described later, the valve closing performance against the pressure of the working fluid is improved and the valve closing state is maintained. A fluid control valve capable of suppressing flow resistance of a working fluid while improving performance can be provided.

(Third embodiment)
A third embodiment will be described with reference to FIGS. The fluid control valve 105 of the third embodiment differs from the first embodiment in the configuration of the second path in the valve closed state with respect to the yoke 156 and the plunger 155. Configurations, operations, and effects that are 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 fluid control valve 105 will be described with reference to FIGS. FIG. 8 shows the valve open state, and FIG. 9 shows the valve closed state. A downstream passage 552c located closer to the outside of the diameter than the cylindrical portion 551 passes through the downstream annular portion 552 of the plunger 155 in the axial direction. As shown in FIGS. 11 and 12, a plurality of downstream passages 552c are provided in the downstream annular portion 552 so as to be circumferentially arranged. Each of the plurality of downstream passages 552c is provided at a position close to the outer peripheral edge in the downstream annular portion 552. The downstream passage 552c communicates with the downstream opening 566a provided in the yoke 156 on the upstream side, and communicates with the outflow port 530 on the downstream side. The internal passage 520, the communication passage 521, the downstream opening 566a, and the downstream passage 552c constitute a passage that connects the inflow port 510 and the outflow port 530.

  The yoke 156 includes an upstream first annular portion 560, an inclined portion 561, a second annular portion 562, a first tubular portion 563, and a downstream annular portion 566. The downstream annular portion 566 is an annular portion that protrudes radially inward from the entire circumference of the inner peripheral surface on the downstream side of the first cylindrical portion 563. The downstream annular portion 566 is a portion connected to a first cylindrical portion 563 which is a separate component. Further, the downstream annular portion 566 may be a portion formed integrally with the first tubular portion 563. In this case, the downstream annular portion 566 is a part of the yoke 156 made of a single component. The downstream annular portion 566 is provided upstream of the downstream end 563a of the first tubular portion 563. With the configuration in which the downstream annular portion 552 is slidably inscribed with respect to the downstream end portion 563a, the plunger 155 is supported slidably in the axial direction with respect to the yoke 156. The downstream-side annular portion 566 and the downstream-side annular portion 552 form parallel portions that are portions facing each other in the axial direction and have a cross-sectional shape along each other.

  The downstream opening 566a is an opening provided on the inner peripheral edge of the downstream annular portion 566. The tubular portion 551 of the plunger 155 is installed in the downstream opening 566a so as to penetrate the downstream annular portion 566 in the axial direction. The downstream passage 552c is located radially outward of the downstream opening 566a. In the downstream side annular portion 552, a portion radially inside the downstream side passage 552c and the downstream side annular portion 566 are opposed to each other in the axial direction. With this configuration, the upstream side surface 552b of the downstream annular portion 552 and the downstream side surface 566b of the downstream annular portion 566 face each other in the axial direction. The upstream side surface 552b and the downstream side surface 566b are provided so as to form a parallel surface.

  The fluid control valve 105 forms a first path which is a magnetic path through which a magnetic flux passes between the plunger 155 and the yoke 156 on the downstream side when energized in the valve open state shown in FIG. The fluid control valve 105 forms a second path that is a magnetic path through which a magnetic flux passes between the plunger 155 and the yoke 156 on the upstream side and the downstream side when power is supplied in the closed state shown in FIGS. 9 and 10. The second path formed on the upstream side in the fluid control valve 105 is a magnetic path through which a magnetic flux passes between the upstream panel 550 and the first annular section 560, and the valve section 550b and the valve seat that are in contact with each other. 560b. As shown in FIG. 10, the second path formed on the downstream side of the fluid control valve 105 is a magnetic path through which magnetic flux passes between the downstream annular portion 566 and the downstream annular portion 552 which are not in close contact with each other. It is a route.

  As shown in FIG. 8, when the valve is in the open state and energized, the downstream ends of the plunger 155 and the yoke 156 are located between the downstream end 563 a of the first cylindrical portion 563 and the downstream annular portion 552. Magnetic flux passes through the first path. In the valve-open state, the distance between the plunger 155 and the yoke 156 on the downstream side is the shortest between the downstream annular portion 552 and the downstream end 563a.

  When the valve closes from the open state shown in FIG. 8 to the valve closed state shown in FIGS. 9 and 10, a reversal phenomenon occurs in which the second path is more dominant than the first path. This is because the downstream-side annular portion 552 and the downstream-side annular portion 566 that constitute the parallel portions are in contact with each other, or are closest between the plunger 155 and the yoke 156 on the downstream side. In the valve-closed state, the second path through which the magnetic flux passes between the upstream panel 550 and the first annular portion 560 is further dominant at the upstream ends of the plunger 155 and the yoke 156.

  The fluid control valve 105 has a configuration in which the valve portion 550b is adsorbed to the valve seat portion 560b by the second path on the upstream side, so that the valve portion 550b is moved to the valve seat portion 560b with respect to the fluid pressure acting on the valve portion 550b. Can be seated. The fluid control valve 105 employs a configuration in which the valve portion 550b is adsorbed to the valve seat portion 560b by the second path, thereby enhancing the suction holding force when the valve is closed against the fluid pressure acting on the valve portion 550b. Can be. The fluid control valve 105 provides an electromagnetic valve having advantageous characteristics related to the suction force of both the first path and the second path shown in FIG.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS. The fluid control valve 205 of the fourth embodiment is different from the second embodiment in the configuration having a valve portion and a valve seat portion on the downstream side of the yoke 156 and the plunger 155. Configurations, operations, and effects that are not particularly described in the fourth embodiment are the same as those in the above-described embodiment, and only the differences from the above-described embodiment will be described below.

  The fluid control valve 205 forms the same first path as in the third embodiment when energized in the valve open state. The fluid control valve 205 forms a second path which is a magnetic path through which a magnetic flux passes between the plunger 155 and the yoke 156 on the upstream side and the downstream side at the time of energization in the valve closed state shown in FIGS. The second path formed on the upstream side in the fluid control valve 205 is a magnetic path through which a magnetic flux passes between the upstream panel portion 550 and the first annular portion 560 that are not in close contact with each other. The second path formed on the downstream side in the fluid control valve 205 is a magnetic path through which a magnetic flux passes between the upstream panel portion 550 and the first annular portion 560 as shown in FIG. The path passes through the upstream side surface 552b and the downstream side surface 566b. With this configuration, the upstream side surface 552b functions as a valve, and the downstream side 566b functions as a valve seat. When the upstream side surface 552b and the downstream side surface 566b come into contact with each other to close the valve, communication between the downstream opening 566a and the downstream passage 552c is impeded, and the fluid path from the inflow port 510 to the outflow port 530 is reduced. Will be shut off.

  The fluid control valve 205 is provided with a configuration in which the upstream side surface 552b, which is a valve portion, is adsorbed to the downstream side surface 566b, which is a valve seat portion, on the downstream side by the second path, so that the valve portion can respond to the fluid pressure acting on the valve portion. Can be seated on the valve seat. The fluid control valve 205 employs a configuration in which the valve portion is suctioned to the valve seat portion by the second path formed on the downstream side, so that the suction holding force when the valve is closed with respect to the fluid pressure acting on the valve portion. Can be strengthened. The fluid control valve 205 provides an electromagnetic valve having advantageous characteristics relating to the suction force of both the first path and the second path shown in FIG.

  According to the fourth embodiment, the upstream side surface 552b and the downstream side surface 566b are parallel portions that form the second path in the valve closed state. According to this configuration, since the upstream side surface 552b and the downstream side surface 566b have a large overlapping area or contact area between the plunger 155 and the yoke 156, they form a second path having a large magnetic flux. Therefore, it is possible to provide the fluid control valve 205 having a valve function at a portion where the attraction force by the electromagnetic force acts, and it is possible to enhance the shutoff performance of the valve.

  According to the fourth embodiment, the second path is formed on the upstream side surface 552b and the downstream side surface 566b where the plunger 155 and the yoke 156 are in contact with each other in the valve closed state. According to this configuration, the fluid control valve 205 has the second path at the upstream side surface 552b and the downstream side surface 566b where the plunger 155 and the yoke 156 are in contact with each other, thereby providing an attraction force capable of maintaining the valve closed state on the downstream side. And the suction holding force at the time of closing the valve can be enhanced.

(Fifth embodiment)
A fifth embodiment will be described with reference to FIGS. The fifth embodiment differs from the third and fourth embodiments in the configuration of the downstream passage 1552c provided in the plunger 255. Configurations, operations, and effects that are not particularly described in the fifth embodiment are the same as those in the above-described embodiment, and only differences from the above-described embodiment will be described below.

  As shown in FIGS. 15 and 16, the downstream passage 1552 c is located between a part of the outer peripheral edge of the downstream annular portion 552 of the plunger 255 that is partially recessed and the downstream end 563 a of the first tubular portion 563. It is a passage formed. The plurality of downstream passages 1552c are provided at intervals along the outer peripheral edge of the downstream annular portion 552 of the plunger 255.

  When this downstream passage 1552c is applied to the fluid control valve 205 of the fourth embodiment, the upstream side surface 552b functions as a valve portion, the downstream side surface 566b functions as a valve seat portion, and the upstream side surface 552b and the downstream side surface 566b. Comes into contact with each other and the valve is closed. As a result, communication between the downstream opening 566a and the downstream passage 1552c is inhibited, and the fluid path from the inflow port 510 to the outflow port 530 is blocked.

(Sixth embodiment)
A sixth embodiment will be described with reference to FIGS. The fluid control valve 305 of the sixth embodiment is different from the first embodiment in that a fluid passage through which the working fluid flows inside the plunger 355 is provided. Configurations, operations, and effects that are not particularly described in the sixth embodiment are the same as those in the first embodiment, and only differences from the first embodiment will be described below.

  The fluid control valve 305 will be described with reference to FIGS. FIG. 17 shows the valve open state, and FIG. 18 shows the valve closed state. The plunger 355 includes an upstream panel 1550 provided on the inflow port 510 side, a downstream annular section 552 provided on the outflow port 530 side, and a tube connecting the upstream panel 1550 and the downstream annular section 552. And a cup-shaped portion having a shape portion 551.

  The upstream board 1550 is formed with an upstream through passage 1550a penetrating in the axial direction at a position including the axis of the plunger 355. The upstream panel 1550 has the same outer diameter as the cylindrical portion 551, and includes a valve portion 1550b that is seated on the valve seat portion 1560b on a surface located on the inflow port 510 side. The upstream side panel 1550 is provided on the plunger 355 upstream of the cylindrical portion 551, and corresponds to a plunger side panel having a flat surface. The valve portion 1550b is a portion provided on the upstream side surface of the upstream side panel portion 1550 so as to surround the upstream side through passage 1550a and to be radially outside the upstream side through passage 1550a. The valve portion 1550b is provided at a position facing the valve seat portion 1560b provided as a part of the yoke 256 in the plunger 355. The axial direction is the moving direction of the plunger 355. The upstream panel 1550 is provided so that at least the valve 1550b forms a surface orthogonal to the axial direction. Further, the upstream-side panel 1550 is provided such that at least the valve 1550b forms a plane parallel to the valve seat 1560b.

  The yoke 256 differs from the yoke 56 of the first embodiment in that an upstream side panel 1560 is provided instead of the first annular portion 560. An upstream through-passage 1560a located radially outside the upstream-side throughpassage 1550a passes through the upstream-side panel 1560 in the axial direction. The upstream side through-path 1560a is provided in the upstream side panel portion 1560 so as to be plurally arranged in the circumferential direction. The upstream board 1560 is provided on the yoke 256 on the upstream side of the inclined portion 561, and corresponds to a yoke-side board having a flat surface. The upstream side through passage 1560a communicates with the internal passage 520 provided on the downstream side in the valve open state shown in FIG. In the valve-open state shown in FIG. 17, the upstream-side through passage 1550a communicates with the internal passage 520 provided on the upstream side, and communicates with the outflow port 530 provided on the downstream side through the inner passage of the tubular portion 551. I have. In the valve-opened state, the upstream-side passage 1560a, the internal passage 520, the upstream-side passage 1550a, and the inside passage of the tubular portion 551 form a passage that connects the inflow port 510 and the outflow port 530.

  A portion of the upstream board 1550 radially outside the upstream through passage 1550a and a portion of the upstream board 1560 radially inside the upstream through passage 1560a are axially opposed to each other. With this configuration, the valve portion 1550b of the upstream panel 1550 and the valve seat 1560b of the upstream panel 1560 face each other in the axial direction. The valve portion 1550b and the valve seat portion 1560b are provided so as to form a parallel surface.

  The fluid control valve 305 forms a first path, which is a magnetic path through which magnetic flux passes between the plunger 355 and the yoke 256 on the downstream side when energized in the valve open state shown in FIG. This is because the distance between the plunger 355 and the yoke 256 on the downstream side in the valve-open state is the shortest between the downstream annular portion 552 and the second cylindrical portion 565.

  The fluid control valve 305 forms a second path which is a magnetic path through which a magnetic flux passes between the plunger 355 and the yoke 256 on the upstream side and the downstream side when power is supplied in the closed state shown in FIG. The second path formed on the upstream side in the fluid control valve 305 is a magnetic path through which a magnetic flux passes between the upstream panel 1550 and the upstream panel 1560 which form parallel parts, This is a path that passes through 1550b and the valve seat 1560b. As shown in FIG. 18, the second path formed on the downstream side in the fluid control valve 305 is formed between the downstream annular portion 564 and the downstream annular portion 552 which are in parallel with each other and are close to or in contact with each other. Is the magnetic path through which the magnetic flux passes. On the downstream side of the fluid control valve 305, when the valve closes from the open state shown in FIG. 17 to the closed state shown in FIG. 18, the reversal phenomenon in which the second path is more dominant than the first path occurs. Occur.

  The fluid control valve 305 is provided with a configuration in which the valve portion 1550b is adsorbed to the valve seat portion 1560b by at least the upstream side by the second path, so that the valve portion 1550b is moved to the valve seat portion 1560b with respect to the fluid pressure acting on the valve portion 1550b. Can be seated. The fluid control valve 305 employs a configuration in which the valve portion 1550b is attracted to the valve seat portion 1560b by the second path, thereby enhancing the suction holding force at the time of closing the valve with respect to the fluid pressure acting on the valve portion 1550b. Can be. The fluid control valve 305 provides an electromagnetic valve having advantageous characteristics related to the suction force of both the first path and the second path shown in FIG.

  The fluid control valve 305 includes a fluid passage through which the working fluid flows inside the plunger 355. According to this configuration, it is possible to provide the fluid control valve 305 capable of mitigating heat generated from the plunger 355 due to energization by the working fluid.

  The fluid control valve 305 includes a fluid passage through which the working fluid flows inside the coil portion 540 and inside the plunger 355. According to this configuration, it is possible to provide the fluid control valve 305 capable of mitigating heat generation from the coil portion 540 and the plunger 355 due to energization by the working fluid.

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure includes the illustrated embodiments and variations based thereon based on those skilled in the art. For example, the disclosure is not limited to the combination of the components and elements shown in the embodiment, and can be implemented with various modifications. 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 embodiments are omitted. The disclosure encompasses the replacement or combination of parts, elements, between one embodiment and another. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical range is shown by the description of the claims, and should be construed to include all modifications within the meaning and scope equivalent to the description of the claims.

  The second embodiment can be applied not only to the fluid control valve of the first embodiment, but also to the fluid control valves according to the third to sixth embodiments.

  The fluid control valve 5 that can achieve the object disclosed in the specification does not limit the first path and the second path to the positions described in the above-described embodiments. Each of the above-described embodiments may be configured such that the shapes of the plunger and the yoke with respect to the magnetic path are reversed between the upstream side and the downstream side.

  The plungers 155, 255, and 355 are made of the same magnetic material as the plunger 55. Like the plunger 55, the plunger 155, 255, 355 is any one of press working, forging, forging, face pressing, rolling, casting, or the like, in which the surface of the valve portion is not polished or cut. Are members formed by a plurality of combinations. The aforementioned yokes 156 and 256 are made of the same magnetic material as the yoke 56. Like the yoke 56, the yokes 156 and 256 are formed by pressing, forging, forging, face pressing, rolling, casting, or any of these, in which the surface of the valve seat is not subjected to polishing or cutting. It is a member formed by a plurality of combinations.

  The fluid control valve of each of the above-described embodiments has a duty ratio in which the control device 8 controls the ratio of the on-time to the time of one cycle formed by the on-time and the off-time of the energization, that is, the duty ratio. It can be configured as a control valve. According to such an energization control for the fluid control valve, the flow rate of the cooling water flowing through the second flow path 11 can be freely adjusted.

  The fluid control valve capable of achieving the object disclosed in the specification is not limited to an electromagnetic valve capable of controlling the flow rate of the cooling water in the cooling water circuit 1 in which the cooling water of the engine 2 circulates. This fluid control valve is, for example, an electromagnetic valve that controls the flow rate of a working fluid that can cool a motor, an inverter, a semiconductor device, or the like, an electromagnetic valve that controls the flow rate of a working fluid used for cooling or heating, the operation of an automatic oil, or the like. It can be used for a solenoid valve that controls oil flow.

5, 105, 205, 305: fluid control valve, 52: intermediate housing (housing)
55, 155, 255, 355: Plunger 56, 156, 256: Yoke, 520: Internal passage, 521: Communication passage (fluid passage)
540: Coil section, 550: Upstream side panel (plunger side panel)
550b, 1550b ... valve part, 552b ... upstream side surface (valve part)
560: first annular portion (yoke side panel portion), 560b, 1560b ... valve seat portion 566b ... downstream side surface (valve seat portion), 1550a ... upstream side through passage (fluid passage)

Claims (12)

A housing (52) having an internal passage (520) through which a working fluid as a liquid flows;
The internal passage is opened and closed so as to be separated from a valve seat portion (560b; 566b; 1560b) so as to be switched between a valve opening state and a valve closing state in which the flow of the working fluid is permitted, and the working fluid in the opening direction is opened. A valve section (550b; 552b; 1550b) on which pressure acts;
A plunger (55) formed by any one or combination of press working, forging, forging, face pressing, rolling, and casting, which constitutes the valve part and is not subjected to polishing or cutting on the surface of the valve part. 155; 255; 355);
A coil portion (540) for generating a magnetic force for driving the plunger in the axial direction when energized;
Forming a magnetic circuit together with the plunger at the time of the energization, comprising a part of the valve seat, wherein the surface of the valve seat that is in contact with the valve is not subjected to polishing or cutting, press working, A yoke (56; 156; 256) formed by any or a combination of forging, forging, face pressing, rolling, and casting;
A fluid control valve comprising: A first path (565, 552; 551, 561; 552, 563a) which is a magnetic path through which a magnetic flux passes between the plunger and the yoke;
A second path (550, 560; 552, 564; 552, 566; 1550, 1560) which is a magnetic path through which magnetic flux passes between the plunger and the yoke at a portion different from the first path;
With
At the start of energization in the valve open state, the first path forms a magnetic path in which the magnetic flux is larger than the second path, and in the valve closed state, the second path is greater than the first path. The fluid control valve according to claim 1, wherein the fluid control valve forms a magnetic path where a magnetic flux increases. A housing (52) having an internal passage (520) through which a working fluid as a liquid flows;
The internal passage is opened and closed so as to be separated from a valve seat portion (560b; 566b; 1560b) so as to be switched between a valve opening state and a valve closing state in which the flow of the working fluid is permitted, and the working fluid in the opening direction is opened. A valve section (550b; 552b; 1550b) on which pressure acts;
A plunger (55; 155; 255; 355) which constitutes the valve portion and is driven in the axial direction;
A coil portion (540) for generating a magnetic force for driving the plunger in the axial direction when energized;
A yoke (56; 156; 256) having the valve seat at a position facing the valve in the axial direction and forming a magnetic circuit together with the plunger during the energization;
A first path (565, 552; 551, 561; 552, 563a) which is a magnetic path through which a magnetic flux passes between the plunger and the yoke;
A second path (550, 560; 552, 564; 552, 566; 1550, 1560) which is a magnetic path through which magnetic flux passes between the plunger and the yoke at a portion different from the first path;
With
At the start of energization in the valve open state, the first path forms a magnetic path in which the magnetic flux is larger than the second path, and in the valve closed state, the second path is greater than the first path. A fluid control valve that forms a magnetic path where the magnetic flux increases. The first path is a part of one of the plunger and the yoke and has an inclined portion (561) having a cross-sectional shape inclined with respect to the other part (551; 563) of the plunger and the yoke. Is the magnetic path through which the magnetic flux passes between
The second path is a parallel portion (550, 560; 552, 566; 552, 564; 1550, 1560) of the plunger and the yoke, which are portions facing each other in the axial direction and have a cross-sectional shape along each other. 4. The fluid control valve according to claim 2, wherein the fluid control valve is a magnetic path through which a magnetic flux passes. The plunger includes a cylindrical portion (551) extending in the axial direction,
The yoke includes the inclined portion having a sectional shape inclined with respect to the cylindrical portion,
The parallel portion is a plunger side plate portion (550; 1550) provided on the plunger on the upstream side of the working fluid from the cylindrical portion, and the yoke on the yoke upstream of the inclined portion on the working fluid side. 5. The fluid control valve according to claim 4, further comprising: a yoke side panel portion (560; 1560).   The fluid control valve according to claim 4, wherein the valve portion and the valve seat portion are provided on the parallel portion forming the second path in the closed state. The second route is set in a plurality of sites,
7. The device according to claim 2, wherein at least one of the second paths set in a plurality of portions is formed at a portion where the plunger and the yoke come into contact with each other in the valve closed state. 8. A fluid control valve as described.   The fluid control valve according to any one of claims 2 to 7, wherein the second path is formed at a portion where the plunger and the yoke come into contact in the valve closed state.   The fluid control valve according to any one of claims 1 to 8, further comprising a fluid passage (521) through which the working fluid flows outside the plunger and inside the coil portion.   The fluid control valve according to any one of claims 1 to 8, further comprising a fluid passage (1550a) through which the working fluid flows, inside the plunger.   The fluid control valve according to any one of claims 1 to 8, further comprising a fluid passage (1550a) through which the working fluid flows, inside the plunger and inside the coil portion.   The fluid control valve according to any one of claims 1 to 11, wherein at least one of the valve portion and the valve seat portion is formed of a magnetic material.

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