JP2009236308A - Solenoid device, linear solenoid valve, fluid control device, and control method of linear solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption of a solenoid device more. <P>SOLUTION: In this solenoid valve 20, a plunger 36 is attracted to a first core 34 by a magnetic flux flowing in a magnetic circuit formed by electrifying a coil 32, and a spool 44 energized in the energizing direction from a first core 34 side is pushed to the first core 34 side as a movable direction, and a permanent magnet 60 arranged in the first core 34 attracts the first core 34 and the plunger 36 when a distance between the plunger 36 and the first core 34 becomes a predetermined distance or less. Since the permanent magnet 60 attracts the first core 34 and the plunger 36, position of the spool 44 can be held without supplying power to the coil 32. The permanent magnet 60 is arranged so that a pole S and a pole N thereof are arranged in the movable direction, and arranged on a side different from a side on which the plunger 36 is attracted to the first core 34 for abutment. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a solenoid device, a linear solenoid valve, a fluid control device, and a linear solenoid valve control method.

Conventionally, as a linear solenoid valve, a plunger is accommodated in a yoke so as to be able to reciprocate, and a magnetic core for attracting the plunger is provided between the plunger and a stator core. A second radial clearance between the stator core and the plunger There has been proposed one that is formed larger than the first radial gap and has improved flatness of suction force characteristics (see, for example, Patent Document 1).
JP 2006-46627 A

  By the way, in the linear solenoid valve described in Patent Document 1, when the steady state in which the plunger is fixed to the tip of the stator core continues, the current must be kept flowing through the coil at the maximum. Since such a steady state occupies a relatively long period during use, there is a problem that power consumption is large.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a solenoid device, a linear solenoid valve, a fluid control device, and a control method for the linear solenoid valve that can further reduce power consumption. .

  The present invention adopts the following means in order to achieve the above-mentioned object.

The solenoid device of the present invention comprises:
A fixed part constituting a part of a magnetic circuit formed along with energization of the coil;
A movable part that is attracted to the fixed part by a magnetic flux flowing through the magnetic circuit and can press the valve body biased in a predetermined biasing direction from the fixed part side to the fixed part side that is a movable direction;
A permanent magnet that is disposed in the fixed portion and that attracts the fixed portion and the movable portion when the movable portion is within a predetermined distance;
It is equipped with.

  In this solenoid device, the movable part is attracted to the fixed part by the magnetic flux flowing through the magnetic circuit formed when the coil is energized, and the valve body urged in the predetermined urging direction from the fixed part side is moved in the movable direction. The permanent magnet that is pressed to a certain fixed part side and is disposed on the fixed part adsorbs the fixed part and the movable part when the movable part and the fixed part are within a predetermined distance. As described above, when the movable portion moves in the movable direction opposite to the biasing direction by suction by energizing the coil, the permanent magnet attracts the fixed portion and the movable portion when the movable portion and the fixed portion are within a predetermined distance. Therefore, the position of the valve body can be maintained without supplying power to the coil. Therefore, power consumption can be further reduced. Here, the “predetermined distance” may be a distance determined by the magnetic force of the permanent magnet, or may be set empirically in accordance with the characteristics of the solenoid device.

  In the solenoid device according to the present invention, the permanent magnet may be disposed at a position away from a portion of the fixed portion where the fixed portion and the movable portion are attracted. By doing this, it is possible to suppress the influence of impact and the like when the fixed part and the movable part are attracted, so that it is possible to further protect the permanent magnet, and further reduce the power consumption. be able to.

  In the solenoid device according to the present invention, the fixed portion is formed so as to be thinner toward the movable portion and increase a magnetic flux in a movable direction of the movable portion; and the movable portion is formed inside the tapered portion. And a contact surface that is formed on the bottom surface side of the insertion space and contacts the movable portion, and the permanent magnet is disposed on the other end side of the contact surface. It is good also as what is arrange | positioned at the end surface of the said fixing | fixed part which is a surface. In this way, the permanent magnet is disposed on the side different from the side on which the movable part is attracted or abutted, and it is possible to further suppress the influence such as impact when the fixed part and the movable part are attracted, Further protection of the permanent magnet can be achieved, and as a result, power consumption can be more reliably reduced. Further, since the permanent magnet is disposed on the side different from the side on which the movable part is attracted or abutted, the assembly is relatively easy.

  In the solenoid device of the present invention, the fixed portion is formed with a through-hole into which a shaft that is pressed by the movable portion to press the valve body is inserted, and the permanent magnet is formed with an insertion hole into which the shaft is inserted. It is good also as what is formed in the disk shape. If it carries out like this, a permanent magnet can be arrange | positioned comparatively easily. Further, the valve body can be smoothly moved through the inserted shaft.

  In the solenoid device of the present invention, the permanent magnet may have an S pole and an N pole disposed in the movable direction. By doing so, a magnetic field is generated in the direction in which the movable part moves, and therefore, the fixed part and the movable part can be attracted to each other by efficiently using the magnetic force of the permanent magnet.

  A linear solenoid valve according to the present invention includes a solenoid device according to any one of the above, a sleeve having a cylindrical inner space in which a fluid flows and having an input port, an output port, and a drain port, A spool device having a shaft-like member inserted into an internal space and having a spool as the valve body that opens and closes each port in association with movement in the axial direction in conjunction with the movable portion. It is. Since the linear solenoid valve of the present invention includes the solenoid device according to any one of the above-described aspects, the same effect as the solenoid device according to any one of the above-described aspects, mainly power consumption can be further reduced. There is an effect that can be done.

The fluid control device of the present invention is
The linear solenoid valve described above;
Power supply means capable of supplying power to the solenoid device of the linear solenoid valve so as to move the movable portion in the movable direction and the biasing direction;
When the movable part is within a predetermined distance and the permanent magnet attracts the fixed part and the movable part, the power supply means interrupts the supply of power to the solenoid device, and the fixed part by the permanent magnet Control means for causing the power supply means to supply power to the solenoid device so as to move the movable part in the urging direction when releasing the suction state with the movable part;
It is equipped with.

  In this fluid control device, electric power can be supplied to the solenoid device so as to move the movable portion in the movable direction and the biasing direction, the movable portion is within a predetermined distance, and the permanent magnet adsorbs the fixed portion and the movable portion. Sometimes, the supply of current to the solenoid device is cut off, and when the attracted state between the fixed portion and the movable portion by the permanent magnet is released, electric power is supplied to the solenoid device so as to move the movable portion in the biasing direction. Thus, since the permanent magnet attracts the fixed part and the movable part within a predetermined distance between the movable part and the fixed part, the position of the valve body can be maintained without supplying power to the coil. Therefore, power consumption can be further reduced. Further, since electric power is supplied to the solenoid device so as to move the movable part in the urging direction, the attracted state between the fixed part and the movable part by the permanent magnet can be released relatively easily.

The linear solenoid valve control method of the present invention is:
A fixed portion constituting a part of a magnetic circuit formed by energizing the coil, and a valve that is attracted to the fixed portion by a magnetic flux flowing through the magnetic circuit and is urged in a predetermined urging direction from the fixed portion side A movable part capable of pressing the body toward the fixed part, which is a movable direction, and a permanent magnet disposed on the fixed part and attracting the fixed part and the movable part when the movable part is within a predetermined distance. A solenoid device, a sleeve having a cylindrical inner space through which a fluid flows and having an input port, an output port, and a drain port, and a shaft-like member inserted into the inner space of the sleeve and interlocking with the movable portion A spool device having a spool as the valve body that communicates and shuts off each port in accordance with the axial movement of the linear solenoid valve,
When the movable part is within a predetermined distance and the permanent magnet attracts the fixed part and the movable part, the power supply to the solenoid device is cut off, and the fixed part and the movable part by the permanent magnet are disconnected. When releasing the suction state, power is supplied to the solenoid device so as to move the movable part in the biasing direction.

  In this linear solenoid valve control method, the moving part moves in a moving direction opposite to the biasing direction by suction by energizing the coil, the moving part is within a predetermined distance, and the permanent magnet attracts the fixed part and the moving part. When this is done, the supply of current to the solenoid device is interrupted, and when releasing the attracted state between the fixed portion and the movable portion by the permanent magnet, electric power is supplied to the solenoid device so as to move the movable portion in the biasing direction. Thus, since the permanent magnet attracts the fixed part and the movable part within a predetermined distance between the movable part and the fixed part, the position of the valve body can be maintained without supplying power to the coil. Therefore, power consumption can be further reduced. Further, since electric power is supplied to the solenoid device so as to move the movable part in the urging direction, the attracted state between the fixed part and the movable part by the permanent magnet can be released relatively easily.

  Next, the best mode for carrying out the present invention will be described using examples.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of a configuration of a hydraulic oil control device 10 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of members provided in a solenoid device 30. The hydraulic oil control apparatus 10 according to the embodiment includes a hydraulic oil supply unit 11 that supplies line hydraulic pressure, an electromagnetic valve 20 that supplies hydraulic oil from the hydraulic oil supply unit 11 to an automatic transmission (not shown), and power to the electromagnetic valve 20. A controller 18 connected to the switching circuit 17 to be supplied and controlling the solenoid valve 20 is provided. The hydraulic oil supply unit 11 includes an oil pump 13 that pumps hydraulic oil from an oil tank 12 and pumps it, a regulator valve 15 that adjusts the hydraulic pressure of the hydraulic oil to a predetermined pressure using a linear solenoid 14, and a regulator valve. And a hydraulic oil line 16 for supplying hydraulic oil from 15 to the electromagnetic valve 20. The switching circuit 17 is configured as a circuit capable of reversing the direction of the current supplied to the electromagnetic valve 20. The controller 18 is configured as a microprocessor centered on a CPU, and includes a ROM that stores various processing programs and various data, a RAM that temporarily stores data, and an input / output device that inputs and outputs information to and from external devices. An output port is provided, and the electromagnetic valve 20 is controlled based on a program stored in the ROM.

  The solenoid valve 20 is used, for example, for hydraulic control of a clutch incorporated in an automatic transmission of a vehicle, and generates an optimal clutch pressure from the regulated hydraulic pressure (line hydraulic pressure) from the hydraulic oil supply unit 11 to thereby set the clutch CL. It is configured as a linear solenoid valve for direct control that can be controlled directly. The electromagnetic valve 20 is configured as a normally closed linear solenoid valve in which the input port 52 is closed in the initial state. As shown in FIG. 1, the solenoid valve 30 is driven by the solenoid device 30 and input. And a spool device 40 that regulates and outputs the hydraulic pressure. In the drawing, the spool 44, the plunger 36 and the shaft 38 are shaded for easy understanding.

  As shown in FIGS. 1 and 2, the solenoid device 30 includes a yoke 31 as a bottomed cylindrical member, and a coil 32 that is disposed on the inner peripheral side of the yoke 31 and in which an insulating conductor is wound around an insulating bobbin 32 a. A flange 33 fixed to the opening end of the yoke 31; a permanent magnet 60 formed with an outer diameter smaller than the flange 33 and disposed on the rear end side (right side in the figure) of the flange 33; From the first core 34 extending in the axial direction along the inner peripheral surface of the coil 32 and the inner periphery of the yoke 31 and at a predetermined interval from the first core 34 along the inner peripheral surface of the coil 32. The cylindrical second core 35 extending in the axial direction up to a predetermined position, and the inner peripheral surface of the second core 35 inserted into the second core 35 and the inner peripheral surface of the first core 34 are axially (movable direction / attached). Slidable plunger 36 in the direction of force) and franc 33, comprises a permanent magnet 60, the first core 34 and the slidable shaft 38 of these inner circumferential surface in the axial direction abuts against the distal end of the second being inserted into the core 35 a plunger 36, a.

  As shown in FIG. 2, the first core 34 is formed in a tapered columnar shape. The first core 34 has a tapered portion 34 a that increases the magnetic flux in the movable direction (left side in the figure) by decreasing the thickness as it approaches the plunger 36. An insertion space 34b that is formed inside the portion 34a and into which the plunger 36 is inserted; a contact surface 34c that is formed on the bottom surface side of the insertion space 34b and that contacts the end surface of the plunger 36; It has an end surface 34 d that is an end-side surface, and a through hole 34 e formed in the central axis of the first core 34 into which a shaft 38 that presses the spool 44 can be inserted.

  The permanent magnet 60 is a neodymium magnet formed in a disc shape in which an insertion hole 60a for inserting the shaft 38 is formed. The permanent magnet 60 has the same outer diameter as that of the first core 34 and is formed so that the flange 33 side becomes an N pole and the first core 34 side becomes an S pole, and between the flange 33 and the first core 34, that is, The plunger 36 and the contact surface 34c are disposed at a position away from the position where the plunger 36 and the contact surface 34c are in contact with or separated from each other. The permanent magnet 60 has a magnetic force empirically obtained so that the plunger 36 is attracted to the first core 34 when reaching a predetermined distance from the contact surface 34c. Here, although the permanent magnet 60 is a neodymium magnet, it may be a samarium cobalt magnet.

  In addition, the solenoid device 30 is provided with a terminal 39 electrically connected to the coil 32 on the outer peripheral portion, and can supply power to the coil 32 via the terminal 39. The yoke 31, the first core 34, the second core 35, and the plunger 36 are all made of a ferromagnetic material such as high-purity iron, and the space between the first core 34 and the second core 35 is It is formed to function as a nonmagnetic material. In addition, since this space should just function as a nonmagnetic material, you may provide nonmagnetic metals, such as stainless steel and brass. In such a solenoid device 30, when the coil 32 is energized through the terminal 39, a magnetic circuit in which magnetic flux flows so as to go around the coil 32 in the order of the yoke 31, the second core 35, the plunger 36, the first core 34, and the yoke 31. As a result, a suction force acts between the first core 34 and the plunger 36 to suck the plunger 36. As described above, the shaft 38 that is slidable in the axial direction on the inner peripheral surface of the first core 34 is in contact with the tip of the plunger 36. It is pushed out in the left direction in FIG.

  The spool device 40 includes a substantially cylindrical sleeve 41 having one end attached to the yoke 31 and the first core 34 of the solenoid device 30, a first land 62, a second land 64, and a third land 66. A spool 44 which is inserted into the inner space 45 and has one end abutting on the tip of the shaft 38 of the solenoid device 30, an end plate 46 screwed to the other end of the sleeve 41, an end plate 46 and the other end of the spool 44. And a coil spring 48 for urging the spool 44 in the urging direction on the solenoid device 30 side. The end plate 46 can finely adjust the urging force of the coil spring 48 by adjusting the screw position.

  The sleeve 41 is provided with an internal space 45 in the axial direction by a through-hole, and inputs hydraulic oil that is formed at a substantially central position in the sleeve 41 in the figure and is pumped from the oil pump 13 as an opening of the internal space 45. An input port 52, an output port 54 that is formed on the rear end side (right side in the figure) from the input port 52 and discharges hydraulic oil to the clutch CL side, and on the rear end side (right end side in the figure) from the output port 54 The drain port 56 that is formed and discharges the hydraulic oil, and the hydraulic oil that is formed on the tip side (left side in the drawing) from the input port 52 and discharged from the output port 54 is input via an oil passage formed outside. A feedback port 58 for feeding back the spool 44 is formed.

  The spool 44 is formed as a shaft-like member that is inserted into the internal space 45 of the sleeve 41, and the first land 62 disposed in the vicinity of the input port 52 substantially at the center of the spool device 40 and the drain port 56 side ( The second land 64 disposed on the rear end side, the third land 66 disposed on the feedback port 58 side (front end side), and the first land 62 and the second land 64 are connected to each other. The input port 52, the output port 54, and the drain are tapered so as to have an outer diameter smaller than the outer diameter of the first and second lands 62, 64 and a smaller outer diameter from the lands 62, 64 toward the center. A communication portion 68 capable of communicating between the ports 56 and a connection portion 69 for connecting the first land 62 and the third land 66 and feeding back the spool 44 are provided.

  The operation of the thus configured solenoid valve 20 of the embodiment, particularly the operation when opening the input port 52 from the initial state will be described. FIG. 3 is a timing chart of the current I supplied to the solenoid valve 20 and the hydraulic pressure P discharged from the solenoid valve 20, and FIG. 4 is an explanatory diagram when the input port 52 of the solenoid valve 20 is opened. At the initial position where the coil 32 is not energized, the spool 44 is on the solenoid device 30 side by the biasing force of the coil spring 48 as shown in FIG. 1, and hydraulic oil is not input from the input port 52. When the controller 18 receives a signal for opening the electromagnetic valve 20 such as an ignition-on signal, for example, the controller 18 supplies a predetermined current to the solenoid device 30 to introduce hydraulic oil into the valve (time t1 to t2). When the coil 32 is energized in this way, the plunger 36 is attracted to the first core 34 with a suction force corresponding to the magnitude of the current applied to the coil 32, and accordingly, the shaft 38 is on the tip side (left direction in FIG. 1). As a result, the spool 44 moves to the coil spring 48 side, and hydraulic oil is introduced from the input port 52 into the valve chamber. Next, the controller 18 gradually supplies a large current to the solenoid device 30 so that the input port 52 is gradually opened to adjust the pressure (time t2 to t3). At this time, the spool 44 has exactly the thrust (suction force) of the plunger 36, the feedback force acting on the spool 44 by the pressure of the hydraulic oil input from the output port 54 to the feedback port 58, and the biasing force of the coil spring 48. The spool 44 stops at a balanced position, and the spool 44 moves to the tip side as the current increases.

  Subsequently, the controller 18 supplies a large current to the solenoid device 30 for a predetermined time so as to be in a steady state in which the input port 52 is kept fully open (time t3 to t4). The predetermined time and current value are empirically set to values sufficient for the plunger 36 to be attracted to the contact surface 34 c of the first core 34. When the coil 32 is energized in this way, as shown in FIG. 4, the input port 52 is fully opened and the plunger 36 is attracted to the contact surface 34 c of the first core 34 by the magnetic force of the permanent magnet 60. Subsequently, the controller 18 cuts off the current supplied to the solenoid device 30 (time t4). Here, the permanent magnet 60 and the plunger 36 are more than the sum of the force that the coil spring 48 urges the plunger 36 in the urging direction and the feedback force that acts on the spool 44 by the pressure of the hydraulic oil input to the feedback port 58. It is designed so that the force for adsorbing the contact surface 34c is larger. Therefore, the end face of the plunger 36 and the contact surface 34c are attracted by the magnetic force of the permanent magnet 60 without supplying current to the solenoid device 30, and the state where the input port 52 is fully opened is maintained.

  Subsequently, when receiving a signal for closing the electromagnetic valve 20, the controller 18 reverses the switching circuit 17 so as to generate an electromagnetic force opposite to the magnetic force of the permanent magnet 60 in order to separate the plunger 36 from the first core 34. A predetermined separation current Ie in the direction is supplied for a predetermined separation time te (time t5 to t6). The separation current Ie and the separation time te are empirically determined to be values sufficient for the plunger 36 to separate from the contact surface 34c of the first core 34. When the plunger 36 is separated from the first core 34 in this way, the controller 18 once supplies a higher current to the solenoid device 30, and gradually decreases the current from the solenoid device 30 so that the input port 52 is gradually closed and regulated. (Time t6 to t7). Then, the input port 52 is gradually closed, the input from the input port 52 is gradually reduced, and the output from the output port 54 is also reduced accordingly. When the input port 52 is closed by the spool 44, the flow rate of the hydraulic oil from the output port 54 decreases and the feedback force decreases, so the controller 18 supplies a predetermined current in the reverse direction for standby. Then, the magnetic force acting on the plunger 36 from the permanent magnet 60 is suppressed (time t7 to t8). And when the signal which opens the solenoid valve 20 is received, the process mentioned above is repeatedly performed.

  Here, the correspondence between the components of the present embodiment and the components of the present invention will be clarified. In this embodiment, the flange 33 and the first core 34 correspond to the fixed portion of the present invention, the plunger 36 corresponds to the movable portion, the switching circuit 17 corresponds to the power supply means, and the controller 18 corresponds to the control means. In the present embodiment, the operation of the hydraulic oil control device 10 is described to clarify an example of the linear solenoid valve control method of the present invention.

  According to the hydraulic oil control device 10 of the present embodiment described in detail above, in the solenoid valve 20, the plunger 36 is attracted to the first core 34 by the magnetic flux flowing through the magnetic circuit formed along with the energization of the coil 32, The spool 44 biased in the biasing direction from the first core 34 side is pressed toward the first core 34 side which is the movable direction, and the permanent magnet 60 disposed in the first core 34 is connected to the plunger 36 and the first core 34. When the core 34 is within a predetermined distance, the first core 34 and the plunger 36 are adsorbed. Thus, since the permanent magnet 60 attracts the first core 34 and the plunger 36, the position of the spool 44 can be held without supplying power to the coil 32. Therefore, power consumption can be further reduced. Further, since the permanent magnet 60 is disposed on the end surface 34d of the first core 34, which is a position away from the portion where the first core 34 and the plunger 36 are attracted and which is the other end side surface of the contact surface 34c. Further, it is possible to further suppress the influence such as an impact when the first core 34 and the plunger 36 are attracted to each other, so that the permanent magnet 60 can be further protected, and the power consumption can be further reduced. be able to. Further, since the permanent magnet 60 is disposed on the side different from the side on which the plunger 36 is attracted or abutted, the assembly of the permanent magnet 60 is relatively easy. Furthermore, since the permanent magnet 60 is formed in a disc shape in which the insertion hole 60a for inserting the shaft 38 is formed, the permanent magnet 60 can be disposed relatively easily, and the permanent magnet 60 can be disposed via the inserted shaft. Thus, the spool 44 can be moved smoothly. Furthermore, since the S pole and the N pole are arranged in the movable direction, a magnetic field is generated in the direction in which the plunger 36 moves. Therefore, the first core 34 and the plunger 36 are efficiently utilized by using the magnetic force of the permanent magnet 60. Can be adsorbed. Then, since the controller 18 supplies the current in the opposite direction to the solenoid device 30 so that the controller 18 moves the plunger 36 in the biasing direction using the switching circuit 17, the first core 34 and the plunger by the permanent magnet 60 are relatively easy. The adsorption state with 36 can be released. Further, since the permanent magnet 60 is sandwiched and disposed between the flange 33 and the first core 34, the permanent magnet 60 can be demagnetized compared to the case where the permanent magnet 60 is disposed alone. It can be suppressed more.

  In addition, this invention is not limited to the Example mentioned above at all, and as long as it belongs to the technical scope of this invention, it cannot be overemphasized that it can implement with a various aspect.

  For example, in the above-described embodiment, the normally closed spool device 40 is provided. However, as shown in FIG. 5, a normally open spool device 140 may be provided. FIG. 5 is an explanatory diagram of the electromagnetic valve 20 including the spool device 140. The spool device 140 has an input port 52 at a substantially central position in the sleeve 141, an output port 54 on the tip side (left side in the figure) from the input port 52, and a drain port 56 on the tip side (left side in the figure) from the output port 54. A feedback port 58 is formed on the rear end side (right side in the figure) of the input port 52. Even in this case, the same effects as those of the above-described embodiment can be obtained.

  In the above-described embodiment, the permanent magnet 60 is disposed between the flange 33 and the first core 34. However, when the plunger 36 is moved to the maximum, the plunger 36 is attracted by the magnetic force of the permanent magnet. Any position may be used as long as it exists. For example, the permanent magnet 60 may be disposed in the vicinity of the contact surface 34c. Further, a coil spring 48 is provided on the rear end side of the plunger 36 so as to be a biasing direction toward the front end side in FIG. 1, and the plunger 36 is moved by the solenoid device 30 as a movable direction toward the rear end side in FIG. It may be arranged on the rear end side of 36. Even in this case, power consumption can be further reduced. From the viewpoint of protecting the permanent magnet, it is preferable to dispose at a position away from the position where the plunger 36 is attracted.

  In the above-described embodiment, the permanent magnet 60 has the south pole and the north pole disposed in the movable direction. However, when the plunger 36 is moved to the maximum, the plunger 36 is attracted by the magnetic force of the permanent magnet. If so, the S pole and the N pole may be arranged in directions other than this. For example, as shown in FIG. 6, a solenoid device 30 </ b> B using a permanent magnet 60 </ b> B in which an S pole and an N pole are disposed toward the outer peripheral direction of the flange 33, which is a direction orthogonal to the movable direction, may be used. FIG. 6 is an explanatory diagram of the solenoid device 30B. Even in this case, power consumption can be further reduced.

  In the above-described embodiment, the spool type electromagnetic valve 20 including the solenoid device 30 is used. However, a bleed type electromagnetic valve including the solenoid device 30 may be used. As a bleed-type solenoid valve, for example, an input port that is a circular opening provided on the distal end side of a substantially cylindrical valve body, and a solenoid device is pressed from the solenoid device to the input port side via a shaft. A spherical ball valve as a valve body that contacts and closes and opens the valve, an output port that is provided in a valve chamber containing the ball valve and discharges hydraulic oil, and is formed on the rear end side from the output port. A valve body having a drain port for discharging may be provided. Even in this case, the permanent magnet 60 attracts the first core 34 and the plunger 36 when the plunger 36 moves to the maximum, so that the position of the spool 44 can be maintained without supplying power to the coil 32. Power consumption can be further reduced.

  In the above-described embodiment, the plunger 36 is assumed to be on the rear end side in the initial state. However, assuming that the plunger 36 is not on the rear end side, a predetermined separation current Ie in the reverse direction is once supplied to the predetermined separation by the switching circuit 17. A predetermined current may be supplied to the solenoid device 30 so as to introduce hydraulic oil into the valve after being supplied for the time te. In the embodiment described above, when the electromagnetic valve 20 is on standby, a predetermined reverse current for standby is supplied to suppress the magnetic force acting on the plunger 36 from the permanent magnet 60, but this is omitted. Also good. According to the characteristics of the solenoid valve 20, for example, the maximum discharge amount of hydraulic oil, the size of the solenoid device 30, the maximum current value, the magnetic force of the permanent magnet 60, etc. What is necessary is just to set suitably the electric current value, time, etc. which are supplied to 30.

  In the embodiment described above, the electromagnetic valve 20 is configured as a linear solenoid valve for direct control capable of directly controlling the clutch CL, but may be configured as a linear solenoid valve for pilot control. Further, it may be non-linear.

  Moreover, although demonstrated with the aspect of the hydraulic-oil control apparatus 10, it is good also as the solenoid valve 20, the aspect of the solenoid apparatus 30, and the aspect of the control method of the solenoid valve 20.

2 is a configuration diagram illustrating an outline of a configuration of a hydraulic oil control device 10. FIG. 3 is an exploded perspective view of a member provided in the solenoid device 30. FIG. 4 is a timing chart of a current I supplied to the solenoid valve 20 and a hydraulic pressure P discharged from the solenoid valve 20. It is explanatory drawing when the input port 52 of the solenoid valve 20 is open | released. It is explanatory drawing of the solenoid valve 20 provided with the spool apparatus 140. FIG. It is explanatory drawing of the solenoid apparatus 30B.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Hydraulic oil control apparatus, 11 Hydraulic oil supply part, 12 Oil tank, 13 Oil pump, 14 Linear solenoid, 15 Regulator valve, 16 Hydraulic oil line, 17 Switching circuit, 18 Controller, 20 Solenoid valve, 30 Solenoid device, 30B Solenoid Device, 31 Yoke, 32 Coil, 32a Bobbin, 33 Flange, 34 First core, 34a Tapered part, 34b Insertion space, 34c Abutting surface, 34d End surface, 34e Through-hole, 35 Second core, 36 Plunger, 38 Shaft , 39 terminal, 40, 140 spool device, 41, 141 sleeve, 44 spool, 45 inner space, 46 end plate, 48 coil spring, 52 input port, 54 output port, 56 drain port, 58 feedback port, 60, 0B permanent magnet, 60a insertion holes, 62 first land, 64 second land, 66 third lands, 68 communicating portion, 69 connection.

Claims (8)

A fixed part constituting a part of a magnetic circuit formed along with energization of the coil;
A movable part that is attracted to the fixed part by a magnetic flux flowing through the magnetic circuit and can press the valve body biased in a predetermined biasing direction from the fixed part side to the fixed part side that is a movable direction;
A permanent magnet that is disposed in the fixed portion and that attracts the fixed portion and the movable portion when the movable portion is within a predetermined distance;
Solenoid device with   The solenoid device according to claim 1, wherein the permanent magnet is disposed at a position away from a portion of the fixed portion where the fixed portion and the movable portion are attracted. The fixed portion has a taper portion that is thinned toward the movable portion to increase the magnetic flux in the movable direction of the movable portion, and an insertion space that is formed inside the tapered portion and into which the movable portion is inserted. And an abutting surface that is formed on the bottom surface side of the fitting insertion space and abuts on the movable part,
The solenoid device according to claim 1, wherein the permanent magnet is disposed on an end surface of the fixed portion that is a surface on the other end side of the contact surface. The fixed portion is formed with a through hole into which a shaft that is pressed by the movable portion and presses the valve body is inserted,
The solenoid device according to any one of claims 1 to 3, wherein the permanent magnet is formed in a disc shape in which an insertion hole for inserting the shaft is formed.   The solenoid device according to claim 1, wherein the permanent magnet has an S pole and an N pole arranged in the movable direction. The solenoid device according to any one of claims 1 to 5,
A sleeve having a cylindrical inner space in which a fluid flows and having an input port, an output port, and a drain port, and an axial member inserted into the inner space of the sleeve and interlocked with the movable portion. A spool device having a spool as the valve body that opens and closes each port with the movement of
Linear solenoid valve with A linear solenoid valve according to claim 6;
Power supply means capable of supplying power to the solenoid device of the linear solenoid valve so as to move the movable portion in the movable direction and the biasing direction;
When the movable part is within a predetermined distance and the permanent magnet attracts the fixed part and the movable part, the power supply means interrupts the supply of power to the solenoid device, and the fixed part by the permanent magnet Control means for causing the power supply means to supply power to the solenoid device so as to move the movable part in the urging direction when releasing the suction state with the movable part;
A fluid control device comprising: A fixed portion constituting a part of a magnetic circuit formed by energizing the coil, and a valve that is attracted to the fixed portion by a magnetic flux flowing through the magnetic circuit and is urged in a predetermined urging direction from the fixed portion side A movable part capable of pressing the body toward the fixed part, which is a movable direction, and a permanent magnet disposed on the fixed part and attracting the fixed part and the movable part when the movable part is within a predetermined distance. A solenoid device, a sleeve having a cylindrical inner space through which a fluid flows and having an input port, an output port, and a drain port, and a shaft-like member inserted into the inner space of the sleeve and interlocking with the movable portion A spool device having a spool as the valve body that communicates and shuts off each port in accordance with the axial movement of the linear solenoid valve, comprising:
When the movable part is within a predetermined distance and the permanent magnet attracts the fixed part and the movable part, the power supply to the solenoid device is cut off, and the fixed part and the movable part by the permanent magnet are disconnected. A linear solenoid valve control method for supplying electric power to the solenoid device so as to move the movable part in the urging direction when releasing the suction state.

Images