JP4858402B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve used for controlling the hydraulic pressure of a hydraulic circuit.

  2. Description of the Related Art Conventionally, a vehicle fluid that applies a braking force to a vehicle wheel by generating a hydraulic pressure in the hydraulic circuit according to the operating force of a brake pedal and supplying the hydraulic pressure in the hydraulic circuit to a wheel cylinder. Pressure brake devices are known. Such a hydraulic brake device is provided with an electromagnetic valve such as a pressure increasing valve or a pressure reducing valve in front of the wheel cylinder. By supplying and closing these electromagnetic valves, hydraulic fluid is supplied to and discharged from the wheel cylinder. The hydraulic pressure is controlled by adjusting the amount, and an appropriate braking force is applied to each wheel.

In addition to such a solenoid valve, various systems have been devised and their uses are various. For example, Patent Document 1 discloses a reversible electric expansion valve that is used in a heat pump air conditioner and that can control the flow rate in exactly the same manner even when the fluid flow direction is reversed. In this expansion valve, the fluid passage and the back pressure chamber are communicated with each other by a pressure equalizing passage formed in the valve body.
Japanese Patent Publication No. 6-65915

  By the way, a general electromagnetic valve includes a spring for abutting or retracting the valve body with respect to the valve seat in a state where no current flows. Since the biasing force of the spring is set so that the valve body does not move unnecessarily when no current flows through the solenoid valve, the spring is assembled to the solenoid valve with a certain amount of restoring force. It will be. Therefore, when opening and closing the flow path of the electromagnetic valve, it is necessary to generate an electromagnetic force that exceeds the restoring force of the spring, leading to an increase in power consumption in the electromagnetic valve. In particular, when the differential pressure between the regions on both sides of the valve body is small, the power consumption is greater than when the differential pressure is large.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an electromagnetic valve capable of reducing power consumption.

  In order to solve the above problems, an electromagnetic valve according to an aspect of the present invention is a solenoid-driven electromagnetic valve for controlling the hydraulic pressure of hydraulic fluid flowing in a hydraulic circuit, the solenoid, the body, and the body And a valve chamber formed on the outlet port side from a valve seat provided in the middle of the hydraulic pressure passage, from the inlet port for introducing the hydraulic fluid to the outlet port for extracting the hydraulic fluid. And an opening / closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic passage, and a valve seat side of both end portions in the moving direction of the opening / closing means. A back chamber formed on the opposite back surface so as to be sealed between the valve chamber, and a communication path communicating from the inlet to the back chamber without passing through the valve seat; The valve is opened and closed by electromagnetic force generated when a current flows through the solenoid. Comprising a suction unit for sucking in a direction away, and a biasing member for biasing the closing means in the closing direction, from. The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure generated by the hydraulic fluid flowing into the back chamber.

  According to this aspect, even when the opening / closing means receives a force in a direction away from the valve seat by the hydraulic fluid introduced from the inlet, the hydraulic fluid having the same hydraulic pressure flows into the back chamber via the communication path. Therefore, the opening / closing means receives a force in the direction toward the valve seat by the flowing hydraulic fluid. For this reason, regardless of the hydraulic pressure of the hydraulic fluid introduced from the introduction port, reverse forces that cancel each other act on the opening / closing means. Therefore, even if the hydraulic pressure of the introduced hydraulic fluid is high, the force acting in the direction of moving the opening / closing means away from the valve seat can be small compared to the case where the hydraulic fluid does not flow into the back chamber. As a result, the urging force required to prevent the valve from opening only with the hydraulic fluid pressure within the pressure range where the solenoid valve is expected to be used can be reduced, so suction is performed against this urging force when the valve is opened. The electromagnetic force generated in the part can be small. In other words, since less current flows through the solenoid, power consumption in the solenoid valve can be reduced.

  Another aspect of the present invention is also a solenoid valve. This solenoid valve is a solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing through the hydraulic circuit, and is formed in the solenoid, the body, and the body, and introduces the hydraulic fluid A hydraulic pressure passage from the hydraulic fluid to the outlet for leading out the hydraulic fluid, a valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage, and the valve chamber and the valve chamber An opening / closing means configured to be able to contact and separate from a seat and capable of opening and closing the hydraulic passage, and a back surface portion opposite to the valve seat side of the both ends in the moving direction of the opening / closing means between the valve chamber and A back chamber formed so as to be sealed, a communication path communicating from the inlet to the back chamber without passing through the valve seat, and an electromagnetic wave generated when a current flows through the solenoid A suction part that sucks the opening / closing means away from the valve seat by force; Provided. The opening / closing means receives a force in a direction toward the valve seat due to a hydraulic pressure of the hydraulic fluid flowing into the back chamber, and a seal area A1 in a state where the opening / closing means is in contact with the valve seat is in the back chamber. The hydraulic pressure by the flowing hydraulic fluid is equal to or less than the pressurizing area A2 applied to the opening / closing means.

  According to this aspect, even when the opening / closing means receives a force in a direction away from the valve seat by the hydraulic fluid introduced from the inlet, the hydraulic fluid having the same hydraulic pressure flows into the back chamber via the communication path. Therefore, the opening / closing means receives a force in the direction toward the valve seat by the flowing hydraulic fluid. For this reason, regardless of the hydraulic pressure of the hydraulic fluid introduced from the introduction port, reverse forces that cancel each other act on the opening / closing means. Therefore, even if the hydraulic pressure of the introduced hydraulic fluid is high, the force acting in the direction of moving the opening / closing means away from the valve seat can be small compared to the case where the hydraulic fluid does not flow into the back chamber. Further, since the seal area A1 is set to be equal to or less than the pressurization area A2, the opening / closing means is separated from the valve seat even when the same hydraulic pressure is applied to the seal surface and the pressurization surface of the opening / closing means. No force is generated. Therefore, the urging means for preventing the valve from being opened only by the hydraulic pressure of the hydraulic fluid within the pressure range where the use of the electromagnetic valve is assumed is not necessary. Further, by reducing the difference between the seal area A1 and the pressurization area A2 when the seal area A1 is equal to or less than the pressurization area A2, a force that is biased toward the direction in which the opening / closing means abuts on the valve seat is generated. Since it can be reduced, the electromagnetic force generated in the suction portion against the biasing force when the valve is opened can be reduced. In other words, since less current flows through the solenoid, power consumption in the solenoid valve can be reduced.

  Further, a biasing member that biases the opening / closing means in the valve closing direction may be provided. Thereby, for example, even when the difference between the seal area A1 and the pressurization area A2 is very small, it is possible to more reliably prevent the valve from being opened by some impact or external force.

  Yet another embodiment of the present invention is also a solenoid valve. This solenoid valve is a solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing through the hydraulic circuit, and is formed in the solenoid, the body, and the body, and introduces the hydraulic fluid A hydraulic pressure passage from the hydraulic fluid to the outlet for leading out the hydraulic fluid, a valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage, and the valve chamber and the valve chamber An opening / closing means configured to be able to contact and separate from a seat and capable of opening and closing the hydraulic passage, and a back surface portion opposite to the valve seat side of the both ends in the moving direction of the opening / closing means between the valve chamber and A back chamber formed so as to be sealed, a communication path communicating from the inlet to the back chamber without passing through the valve seat, and an electromagnetic wave generated when a current flows through the solenoid A suction part for sucking the opening / closing means in a direction to contact the valve seat by force; Comprising a biasing member for urging the opening and closing means in the valve opening direction. The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure generated by the hydraulic fluid flowing into the back chamber.

  According to this aspect, when no current flows through the solenoid, the opening / closing means is urged in the valve opening direction by the urging means, so that the working fluid flows from the inlet to the outlet. In this state, even if the opening / closing means receives a force in a direction away from the valve seat by the hydraulic fluid introduced from the introduction port, the hydraulic fluid having the same hydraulic pressure flows into the back chamber via the communication path. Therefore, the opening / closing means receives a force in the direction toward the valve seat by the flowing hydraulic fluid. For this reason, regardless of the hydraulic pressure of the hydraulic fluid introduced from the introduction port, reverse forces that cancel each other act on the opening / closing means. Therefore, even if the hydraulic pressure of the introduced hydraulic fluid is high, the force acting in the direction of moving the opening / closing means away from the valve seat can be small compared to the case where the hydraulic fluid does not flow into the back chamber. As a result, the urging force required to prevent the valve from closing only with the hydraulic fluid pressure within the pressure range where the solenoid valve is expected to be used can be reduced. The electromagnetic force generated in the part can be small. In other words, since less current flows through the solenoid, power consumption in the solenoid valve can be reduced.

  Yet another embodiment of the present invention is also a solenoid valve. This solenoid valve is a solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing through the hydraulic circuit, and is formed in the solenoid, the body, and the body, and introduces the hydraulic fluid A hydraulic pressure passage from the hydraulic fluid to the outlet for leading out the hydraulic fluid, a valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage, and the valve chamber and the valve chamber An opening / closing means configured to be able to contact and separate from a seat and capable of opening and closing the hydraulic passage, and a back surface portion opposite to the valve seat side of the both ends in the moving direction of the opening / closing means between the valve chamber and A back chamber formed so as to be sealed, a communication path communicating from the inlet to the back chamber without passing through the valve seat, and an electromagnetic wave generated when a current flows through the solenoid A suction part that sucks in a direction in which the opening / closing means is brought into contact with the valve seat by force; Obtain. The opening / closing means receives a force in a direction toward the valve seat due to a hydraulic pressure of the hydraulic fluid flowing into the back chamber, and a seal area A1 in a state where the opening / closing means is in contact with the valve seat is in the back chamber. The hydraulic pressure due to the flowing hydraulic fluid is equal to or greater than the pressurizing area A2 applied to the opening / closing means.

  According to this aspect, even when the opening / closing means receives a force in a direction away from the valve seat by the hydraulic fluid introduced from the inlet, the hydraulic fluid having the same hydraulic pressure flows into the back chamber via the communication path. Therefore, the opening / closing means receives a force in the direction toward the valve seat by the flowing hydraulic fluid. For this reason, regardless of the hydraulic pressure of the hydraulic fluid introduced from the introduction port, reverse forces that cancel each other act on the opening / closing means. Therefore, even if the hydraulic pressure of the introduced hydraulic fluid is high, the force acting in the direction of moving the opening / closing means away from the valve seat can be small compared to the case where the hydraulic fluid does not flow into the back chamber. Further, since the seal area A1 is set to be equal to or greater than the pressurization area A2, the opening / closing means is brought into contact with the valve seat even when the same hydraulic pressure is applied to the sealing surface and the pressure surface of the opening / closing means. No direction force is generated. Therefore, the urging means for preventing the valve from closing only with the hydraulic pressure of the hydraulic fluid in the pressure range where the use of the electromagnetic valve is assumed is not necessary. Further, by reducing the difference between the seal area A1 and the pressurization area A2 when the seal area A1 is equal to or greater than the pressurization area A2, the force that is urged toward the direction in which the opening / closing means is separated from the valve seat is generated. Since it can be made smaller, the electromagnetic force generated by the suction portion against the biasing force when the valve is closed can be reduced. In other words, since less current flows through the solenoid, power consumption in the solenoid valve can be reduced. In addition, it is more preferable that the pressure area A2 is smaller than the seal area A1. Thereby, it is possible to prevent the valve from being opened due to some impact or external force.

  Further, a biasing member that biases the opening / closing means in the valve opening direction may be provided. Thereby, for example, even when the difference between the seal area A1 and the pressurization area A2 is very small, it is possible to more reliably prevent the valve from being closed by some impact or external force.

  The opening / closing means supports a valve body that is arranged so as to be able to contact and separate from the valve seat and can open and close the valve portion, and an end opposite to the valve seat side of the valve body and faces the suction portion. The plunger is disposed between the plunger and the back chamber so as to abut the end of the plunger on the back chamber side, and is pressed against the valve seat while pressing the plunger by the hydraulic pressure of the back chamber. And a moving member configured to be movable in the direction of heading.

  As a result, the plunger that contacts the valve seat, the plunger that supports the valve body, and the moving member are separated, so that the plunger center does not necessarily coincide with the axial center of the moving member. Can move in the direction toward the valve seat while being pressed by the moving member, and can satisfy the sealing performance. Therefore, the tolerance with respect to the axial displacement of each of the plunger and the moving member can be increased.

  The body includes a sleeve in which the valve chamber is formed and a through-hole is formed on a side surface closer to the introduction port than the valve seat, and the sleeve is fitted to the outer peripheral surface of the sleeve. A groove is formed on the inner peripheral surface so that a gap passage is formed between the inner surface and the concave portion is formed on the inner bottom portion so that the back chamber is formed between the sleeve and the bottom surface of the sleeve. And a cap. The gap passage may constitute at least a part of the communication passage.

  Accordingly, the gap passage constituting at least a part of the communication passage can be formed by a simple assembly in which the cap is attached to the sleeve, and one member is processed to form an elongated through hole as the passage. Compared to the case, each member can be easily processed.

  The sleeve is a stepped cylindrical member having a small-diameter portion and a large-diameter portion, and a path for leading the hydraulic fluid fed from the through hole to the gap passage is formed in the large-diameter portion. In addition, the step portion is provided with a circumferential circumferential groove, and the communication path may include the through hole, the path, the circumferential groove, and the gap path.

  As a result, even if the phase in the circumferential direction of the body of the solenoid valve does not match between the gap passage and the passage of the sleeve, the working fluid is led out to the back chamber through the entire circumferential groove. The phase alignment at the time of assembling becomes unnecessary, and the assembling process can be simplified.

  The body includes a sleeve in which the valve chamber is formed and a through-hole is formed on a side surface closer to the introduction port than the valve seat, and the sleeve between the sleeve and the sleeve when the sleeve is mounted. An inner circumferential surface is formed so that a gap is formed on the entire circumference of the sleeve, and a recess is formed in the inner bottom portion so that the back chamber is formed between the bottom surface of the sleeve; You may have. The gap may constitute at least a part of the communication path.

  This eliminates the need to form a groove on the inner peripheral surface of the cap, facilitating processing of the cap. In addition, since a gap is formed around the outer peripheral surface of the sleeve and the inner peripheral surface of the cap, there is no need for press-fitting when the sleeve is attached to the cap, and the assemblability is improved. .

  The sleeve is a stepped cylindrical member having a small-diameter portion and a large-diameter portion, and a path for leading the hydraulic fluid delivered from the through hole to the gap is formed in the large-diameter portion. The step portion is provided with a circumferential circumferential groove, and the communication path may include the through hole, the path, the circumferential groove, and the gap.

  As a result, the working fluid can be introduced to the back chamber through the entire circumferential gap and the circumferential groove between the sleeve and the cap, so that phase alignment when assembling the sleeve and the cap becomes unnecessary, and the assembly process can be simplified. it can.

  You may further provide the sealing means which seals between the said valve chamber and the said back chamber so that the said opening-and-closing means can move. The sealing means includes a first seal member disposed on the valve chamber side, a second seal member disposed on the back chamber side, having a hardness higher than that of the first seal member and a low crushing rate, You may have.

  Usually, since the back chamber has a higher pressure than the valve chamber, the deformation of the seal member tends to increase. Therefore, by disposing a plurality of seal members, the crushing rate of the second seal member disposed on the back chamber side is lower than that of the first seal member, thereby reducing the pressing force and reducing the sliding resistance. Can be lowered. Further, by making the first seal member softer than the second seal member, it is possible to improve the mobility of the moving member and to prevent minute leakage of the working fluid from the second seal member.

  ADVANTAGE OF THE INVENTION According to this invention, the solenoid valve which can reduce power consumption can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. The solenoid valve described in each of the following embodiments can be applied as long as it is a hydraulic circuit that controls the hydraulic pressure, and is suitable for use, for example, in a hydraulic circuit of an electronically controlled brake system for a vehicle. It is. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Moreover, in the following description, the positional relationship of each component may be expressed based on the illustrated state for convenience, but the positional relationship is only relative.

(First embodiment)
FIG. 1 is a cross-sectional view schematically showing a schematic configuration of the electromagnetic valve according to the first embodiment. The electromagnetic valve 10 is driven to control the hydraulic pressure of the hydraulic fluid flowing through the hydraulic pressure circuit, and a body 12 provided with a valve portion therein and a solenoid 14 for controlling the opening degree of the valve portion are integrated. It is comprised as an electromagnetic valve provided in the.

  The body 12 has a cylindrical shape, and is provided with an introduction port 16 for introducing hydraulic fluid, for example, brake fluid, from the upstream side (primary pressure side) on one end surface thereof, and the side portion near the center in the longitudinal direction operates. A lead-out port 18 for leading the liquid downstream (secondary pressure side) is provided. A valve hole 20 is provided in a hydraulic pressure passage communicating the introduction port 16 and the outlet port 18. The opening on the outlet port 18 side of the valve hole 20 is formed in a tapered shape, and the valve seat 22 is configured by the tapered surface.

  A valve chamber 23 is formed on the right side of the valve seat 22 in the body 12, and a rod member 24 in which a valve body portion 24 a is integrated is disposed inside the valve chamber 23. The valve body portion 24a is composed of one end portion of a stepped cylindrical rod member 24, and is arranged so as to be able to contact and separate from the valve seat 22 from the outlet port 18 side. Therefore, the rod member 24 functions as an opening / closing means that can open and close the hydraulic passage. In the present embodiment, the rod member 24 itself can also be regarded as a valve body.

  The solenoid 14 includes a cylindrical suction portion 26 fixed inside the body 12, an electromagnetic coil 28 externally attached to the body 12, and a case (not shown) that accommodates the electromagnetic coil 28 therein. Yes.

  In the present embodiment, the attracting portion 26 constitutes a magnetic circuit together with the rod member 24. The rod member 24 has a flange portion 24b that extends slightly outward at the center thereof. Therefore, the suction part 26 generates a force in a direction in which the rod member 24 is separated from the valve seat 22 by sucking the flange part 24b by an electromagnetic force generated when a current flows through the electromagnetic coil 28 of the solenoid 14. Functions as a suction unit.

  Inside the body 12, it is formed so that the space between the valve chamber 23 is sealed at the back of the rod member 24 in the moving direction (longitudinal direction) opposite to the valve seat 22. A back chamber 30 is provided. An insertion hole 32 is formed between the valve chamber 23 and the back chamber 30 so that the small diameter portion 24c on the rear end side of the rod member 24 can slide. Further, the small diameter portion 24 c of the rod member 24 is inserted into the insertion hole 32 in a state where the O-ring 34 as a seal member is attached to the annular groove 36 formed in the middle of the inner peripheral surface of the insertion hole 32. Thus, the valve chamber 23 and the back chamber 30 are sealed.

  In the body 12, a communication path 38 that communicates from the introduction port 16 to the back chamber 30 without passing through the valve seat 22 is formed. Therefore, the rod member 24 receives a force in the direction toward the valve seat 22 due to the hydraulic pressure of the hydraulic fluid flowing into the back chamber 30. The electromagnetic valve 10 also includes a spring 40 as a biasing member that biases the rod member 24 in the valve closing direction. The spring 40 is wound around the small diameter portion 24 c of the rod member 24, and one end portion is in contact with the flange portion 24 b and the other end portion is in contact with the end surface of the insertion hole 32 on the valve chamber 23 side. . The spring 40 is compressed in the state of FIG. 1, and generates a biasing force in a direction in which the rod member 24 is pressed against the valve seat 22.

  In the state shown in FIG. 1, the solenoid valve 10 is connected with the hydraulic fluid having the same hydraulic pressure even when the rod member 24 receives a force in the direction away from the valve seat 22 by the hydraulic fluid introduced from the introduction port 16. Since it flows into the back chamber 30 via the passage 38, the rod member 24 receives a force in the direction toward the valve seat 22 by the flowing hydraulic fluid. Therefore, regardless of the hydraulic pressure level of the hydraulic fluid introduced from the introduction port 16, reverse forces that cancel each other work on the rod member 24. Therefore, even if the hydraulic pressure P1 of the introduced hydraulic fluid is high, the force acting in the direction of separating the rod member 24 from the valve seat 22 is small compared to the case where the hydraulic fluid does not flow into the back chamber 30. That's it. As a result, the urging force of the spring 40 necessary for preventing the valve from being opened only by the hydraulic pressure of the hydraulic fluid within a pressure range in which the electromagnetic valve 10 is assumed to be used can be reduced. In contrast, the electromagnetic force generated by the suction unit 26 can be small. That is, since a small amount of current flows through the solenoid 14, power consumption in the solenoid valve 10 can be reduced.

  In the electromagnetic valve 10 according to the present embodiment, as shown in FIG. 1, the seal area A1 in a state where the rod member 24 is in contact with the valve seat 22 has a hydraulic pressure due to the hydraulic fluid flowing into the back chamber 30. You may employ | adopt the rod member 24 processed so that it may become the pressurization area A2 added to the small diameter part 24c of the rod member 24 or less.

  In this case, even if the same hydraulic pressure is applied to the sealing surface of the valve body portion 24a and the pressurizing surface of the small diameter portion 24c, no force is generated in the direction of separating the rod member 24 from the valve seat. Therefore, an urging means for preventing the valve from being opened only by the hydraulic pressure of the hydraulic fluid within a pressure range in which the electromagnetic valve 10 is assumed to be used becomes unnecessary, and the cost can be reduced by reducing the number of parts and the number of assembly steps. . Further, the seal area A1 is equal to or less than the pressurization area A2, and the difference between the seal area A1 and the pressurization area A2 is reduced, so that the rod member 24 comes into contact with the valve seat 22 by the hydraulic pressure of the hydraulic fluid. Since the urging force can be reduced, the electromagnetic force generated by the suction portion 26 against the urging force when the valve is opened can be reduced. That is, since a small amount of current flows through the electromagnetic coil 28 of the solenoid 14, power consumption in the electromagnetic valve 10 can be reduced. Further, the attractive force by the electromagnetic force is proportional to the number of turns of the coil of the electromagnetic coil 28 x the current, so that the voltage and size of the electromagnetic coil 28 can be reduced.

  Further, by reducing the difference between the seal area A1 and the pressurization area A2, the electromagnetic force required for the rod member 24 to move away from the valve seat 22 and start to open depends on the hydraulic pressure at the introduction port 16. You do n’t have to. Therefore, the valve opening amount is substantially proportional to the control current flowing through the electromagnetic coil 28, and the hydraulic pressure can be controlled without using the hydraulic pressure sensor. As a result, the cost of the entire hydraulic circuit using the electromagnetic valve 10 can be reduced.

  The solenoid valve 10 according to the present embodiment does not require the spring 40 by setting the seal area A1 to be equal to or less than the pressurization area A2, but by providing the spring 40, for example, the pressurization area A1 and pressurization Even when the difference from the area A2 is very small, it is possible to more reliably prevent the valve from being opened by some impact or external force.

(Second Embodiment)
FIG. 2 is a cross-sectional view schematically showing a schematic configuration of the electromagnetic valve according to the second embodiment. The electromagnetic valve 110 according to the second embodiment is different from the first embodiment in that the opening / closing means is not integrated as in the rod member 24 according to the first embodiment, but is composed of a plurality of members. This is a point greatly different from the electromagnetic valve 10 according to the embodiment. Hereinafter, the same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In the electromagnetic valve 110, a valve body 112 is disposed on the right side of the valve seat 22 of the body 12. The valve body 112 is composed of one end of a cylindrical rod member 114, and is disposed so as to be able to contact and separate from the valve seat 22 from the outlet port 18 side. In the present embodiment, the rod member 114 itself can also be regarded as a valve body.

  The plunger 116 is provided with a connecting hole 118 at the center of its left end surface. The valve body 112 is integrally fixed to the plunger 116 by press-fitting the end of the rod member 114 opposite to the valve body 112 into the connecting hole 118. Further, the plunger 116 is disposed to face the suction part 26 on the back chamber 30 side. In the present embodiment, the suction unit 26 constitutes a magnetic circuit together with the plunger 116. The suction portion 26 attracts the plunger 116 by electromagnetic force generated when a current flows through the electromagnetic coil 28 of the solenoid 14, thereby moving the rod member 114 connected to the plunger 116 away from the valve seat 22. It functions as a suction part that generates force.

  The opening / closing means according to the present embodiment supports a valve body 112 that is arranged so as to be able to contact and separate from the valve seat 22 and can open and close the valve portion, and an end portion of the valve body 112 opposite to the valve seat 22 side. At the same time, the plunger 116 is disposed between the plunger 116 and the back chamber 30 so as to come into contact with the plunger 116 disposed opposite to the suction portion 26 and the end of the plunger 116 on the back chamber 30 side. The reaction force pin 120 is configured to be movable in the direction toward the valve seat 22 while pressing the plunger 116.

  In other words, in the inside of the body 12, the reaction force that is slidably assembled in the insertion hole 32 at the opposite end of the plunger 116 in the moving direction (longitudinal direction) from the valve seat 22 side. The end of the pin 120 is in contact. The end of the reaction force pin 120 that comes into contact with the plunger 116 has a tip that is processed into a spherical shape, and can reliably press the plunger 116 in one direction.

  In the electromagnetic valve 110, the valve body 112 that contacts the valve seat 22, the plunger 116 that supports the valve body 112, and the reaction force pin 120 are separated from each other, so that the reaction force is not necessarily equal to the axial center of the valve body 112 or the plunger 116. Even if the axial center of the pin 120 does not coincide, the plunger 116 can move in the direction toward the valve seat 22 while being pressed by the reaction force pin 120 and can satisfy the sealing performance by the valve body 112. Therefore, the tolerance with respect to the axial displacement of each of the plunger 116 and the reaction force pin 120 can be increased. That is, according to the electromagnetic valve 110 according to the present embodiment, it is possible to reduce the processing accuracy and assembly accuracy of the members, and the cost can be reduced.

(Third embodiment)
FIG. 3 is a cross-sectional view schematically showing a schematic configuration of the electromagnetic valve according to the third embodiment. The solenoid valve 210 according to the third embodiment is a so-called normally open type solenoid valve that is opened when not energized, and is greatly different from the solenoid valves according to the above-described embodiments. Is a point. Hereinafter, the same elements as those in the above-described embodiments are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In the electromagnetic valve 210, a valve chamber 211 is formed on the right side of the valve seat 22 in the body 12, and a plunger 212 in which a valve body portion 212 a is integrated is disposed inside the valve chamber 23. Yes. The valve body portion 24a is composed of one end portion of a stepped columnar plunger 212, and is arranged so as to be able to contact and separate from the valve seat 22 from the outlet port 18 side. Therefore, the plunger 212 functions as an opening / closing means that can open and close the hydraulic passage.

  In the present embodiment, fixed iron core 214 constitutes a magnetic circuit together with plunger 212. The plunger 212 has a flange portion 212b whose right portion extends slightly outward. Therefore, the fixed iron core 214 generates a force in a direction in which the plunger 212 is brought into contact with the valve seat 22 by attracting the flange portion 212b with an electromagnetic force generated when a current flows through the electromagnetic coil 28 of the solenoid 14. Functions as a suction unit.

  A reaction force pin 216 slidably held in the insertion hole 32 is disposed between the valve chamber 23 and the back chamber 30 so as to contact the rear end side of the plunger 212. Further, the small diameter portion 24 c of the rod member 24 is inserted into the insertion hole 32 in a state where the O-ring 34 as a seal member is attached to the annular groove 36 formed in the middle of the inner peripheral surface of the insertion hole 32. Thus, the valve chamber 23 and the back chamber 30 are sealed.

  The opening / closing means according to the present embodiment includes a plunger 212 that is disposed at the valve seat 22 so as to be able to contact / separate and can open / close the valve portion at its end, and is disposed opposite to the fixed iron core 214. The plunger 212 is disposed between the plunger 212 and the back chamber 30 so as to come into contact with the end of the plunger 212 on the back chamber 30 side, and moves toward the valve seat 22 while pressing the plunger 212 by the hydraulic pressure of the back chamber 30. It is configured to include a reaction force pin 216 that can be configured. In addition, you may comprise the valve body part 212a with the plunger 212 and another member.

  In the body 12, a communication path 38 that communicates from the introduction port 16 to the back chamber 30 without passing through the valve seat 22 is formed. Therefore, the plunger 212 receives a force in the direction toward the valve seat 22 via the reaction force pin 216 due to the hydraulic pressure of the hydraulic fluid flowing into the back chamber 30. The electromagnetic valve 210 includes a spring 218 as a biasing member that biases the plunger 212 in the valve opening direction. The spring 218 is wound in the vicinity of the valve body 212 a of the plunger 212, one end abuts against a flange portion 212 c formed at the center of the plunger 212 and the other end of the valve seat 22. It is in contact with the end surface around the tapered surface. The spring 218 is compressed in the state of FIG. 3, and generates a biasing force in a direction in which the plunger 212 is separated from the valve seat 22.

  Even when the solenoid 212 receives a force in the direction in which the plunger 212 is separated from the valve seat 22 by the hydraulic fluid introduced from the introduction port 16 in the state shown in FIG. Since it flows into the back chamber 30 via 38, the plunger 212 receives a force in the direction toward the valve seat 22 by the flowing hydraulic fluid. Therefore, regardless of the hydraulic pressure level of the hydraulic fluid introduced from the introduction port 16, reverse forces that cancel each other work on the plunger 212. Therefore, even if the hydraulic pressure P1 of the introduced hydraulic fluid is high, the force acting in the direction in which the plunger 212 is separated from the valve seat 22 can be smaller than when hydraulic fluid does not flow into the back chamber 30. . As a result, the biasing force of the spring 218 required to prevent the solenoid valve 210 from being closed only by the hydraulic pressure of the hydraulic fluid within the pressure range assumed to be used can be reduced. On the other hand, the electromagnetic force generated by the fixed iron core 214 can be small. That is, since a small amount of current flows through the electromagnetic coil 28 of the solenoid 14, power consumption in the electromagnetic valve 210 can be reduced.

  In the electromagnetic valve 210 according to the present embodiment, as shown in FIG. 3, the hydraulic fluid that has flowed into the back chamber 30 has a seal area A <b> 1 in a state where the valve body 212 a of the plunger 212 is in contact with the valve seat 22. Plunger 212 that is processed so that the hydraulic pressure due to the pressure is greater than or equal to pressurization area A2 applied to reaction force pin 216 may be employed.

  In this case, even if the same hydraulic pressure is applied to the sealing surface of the valve body 212a and the pressure surface of the reaction force pin 216, no force is generated in the direction in which the plunger 212 is brought into contact with the valve seat. Therefore, an urging means for preventing the valve from being closed only by the hydraulic pressure of the hydraulic fluid within a pressure range in which the electromagnetic valve 210 is assumed to be used becomes unnecessary, and the cost can be reduced by reducing the number of parts and the number of assembling steps. . Further, by reducing the difference between the seal area A1 and the pressurization area A2 so that the seal area A1 is equal to or greater than the pressurization area A2, the valve body portion 212a of the plunger 212 is separated from the valve seat 22 by the hydraulic pressure of the hydraulic fluid. Since the force urged toward the separating direction can be reduced, the electromagnetic force generated by the fixed iron core 214 against the urging force when the valve is closed can be reduced. That is, since a small amount of current flows through the electromagnetic coil 28 of the solenoid 14, power consumption in the electromagnetic valve 210 can be reduced. Further, the attractive force by the electromagnetic force is proportional to the number of turns of the coil of the electromagnetic coil 28 x the current, so that the voltage and size of the electromagnetic coil 28 can be reduced.

  Further, by reducing the difference between the seal area A1 and the pressurization area A2, the electromagnetic force required for the rod member 24 to contact the valve seat 22 and start to close depends on the hydraulic pressure at the introduction port 16. You do n’t have to. For this reason, the amount of decrease in the flow rate of the valve portion when the valve is closed is substantially proportional to the control current flowing through the electromagnetic coil 28, and the hydraulic pressure can be controlled without using the hydraulic pressure sensor. As a result, the cost of the entire hydraulic circuit using the electromagnetic valve 210 can be reduced.

  In addition, the solenoid valve 210 according to the present embodiment does not require the spring 218 by setting the seal area A1 to be the pressurization area A2 or more, but by providing the spring 218, for example, the pressurization area A1 and the pressurization area Even when the difference from the area A2 is very small, it is possible to more reliably prevent the valve from being opened by some impact or external force.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS. FIG. 4 is an overall perspective view of the solenoid valve according to the fourth embodiment. 5 is a cross-sectional view taken along line AA ′ of FIG.

  As shown in FIGS. 4 and 5, the electromagnetic valve 310 according to the present embodiment includes a body 312 provided with a valve portion therein and a solenoid 313 for controlling the opening degree of the valve portion (see FIG. 4). (Not shown) are integrally provided.

  The body 312 has a stepped cylindrical sleeve 314 and a cap 316 attached to the upper end of the sleeve 314. The sleeve 314 has a stepped cylindrical shape, and an opening port 318 for introducing the working fluid from the upstream side (primary pressure side) is provided at the lower end opening thereof, and the working fluid is placed downstream on the side near the center in the longitudinal direction. A pair of outlet ports 320 that lead out to the (secondary pressure side) is provided. A bottomed cylindrical valve seat member 322 is press-fitted into a hydraulic pressure passage that connects the introduction port 318 and the outlet port 320, and penetrates in the center of the bottom of the valve seat member 322 in the axial direction. A valve hole 324 is provided. The opening on the outlet port 320 side of the valve hole 324 is formed in a tapered shape, and a valve seat 326 is formed by the tapered surface.

  A valve body 328 is disposed above the valve seat 326 in the sleeve 314. The valve body 328 is composed of one end of a stepped columnar rod member 330 and is arranged so as to be able to contact and separate from the valve seat 326 from the outlet port 320 side. In the present embodiment, the rod member 330 itself can also be regarded as a valve body.

  On the other hand, the solenoid 313 includes an electromagnetic coil 336 and a case 338 that houses the electromagnetic coil 336 therein. The lower end portion of the case 338 is fixed to the step portion of the cap 316. In the present embodiment, the suction part 332 of the sleeve 314 may be joined as a separate member.

  The plunger 334 is provided with a connection hole 340 at the center of the lower end surface. The valve body 328 is integrally fixed to the plunger 334 by press-fitting the end of the rod member 330 opposite to the valve body 328 into the connecting hole 340. The rod member 330 has a flange portion 342 that slightly extends outward at the center thereof, and the press-fitting amount is regulated by the flange portion 342 abutting against the end surface of the plunger 334. A valve chamber 344 is formed below the plunger 334, and a back pressure chamber 346 is formed above the plunger 334, respectively. In the present embodiment, the attraction unit 332 forms a magnetic circuit.

  An insertion hole 348 is provided in the upper portion of the sleeve 314, and a headed reaction force pin 350 is disposed so as to extend on the same axis as the plunger 334. In the insertion hole 348, the reaction force pin 350 is slidably supported, and a part of the reaction pin 350 serves as a pressurized portion 352 and is exposed to the back chamber 353 formed between the sleeve 314 and the cap 316. is doing. Further, a sealing O-ring 356 (corresponding to a “seal member”) is disposed in the concave portion 354 at the upper end portion of the sleeve 314 so as to pass through the central portion of the reaction force pin 350, and is inserted through the insertion hole 348. Prevents leaked hydraulic fluid. Further, a coil spring 358 for biasing the reaction force pin 350 against the plunger 334 is interposed in the back chamber 353. That is, the coil spring 358 functions as a biasing member that biases the plunger 334 in the downward valve closing direction.

  In the electromagnetic valve 310 according to the present embodiment, a communication path 359 that communicates from the introduction port 318 to the back chamber 353 without passing through the valve seat 326 is formed. Thereby, the same effect as the above-mentioned embodiment is achieved. Below, the structure of the communicating path 359 which concerns on this Embodiment is explained in full detail.

  In the sleeve 314 according to the present embodiment, a through hole 360 communicating with the introduction port 318 via the valve seat member 322 is formed on the side surface on the introduction port 318 side from the valve seat 326. The cap 316 has a slit 364 formed on the inner peripheral surface so that a gap passage 362 is formed between the cap 316 and the sleeve 314 in a state of being fitted to the outer peripheral surface of the sleeve 314, and a bottom surface 365 of the sleeve 314. A recess 367 is formed in the inner bottom so that the aforementioned back chamber 353 is formed therebetween. The gap passage 362 constitutes a part of the communication passage 359.

  In the electromagnetic valve 310 according to the present embodiment, the gap passage 362 constituting a part of the communication passage 359 can be formed by simple assembly in which the cap 316 is attached to the sleeve 314. Further, the slit 364 may be formed on the inner peripheral surface of the cap 316 as compared with the case where one member is processed to form an elongated through-hole as a passage, and the member can be easily processed.

  The sleeve 314 is a stepped cylindrical member having a small-diameter portion 366 and a large-diameter portion 368, and a path 370 for leading the hydraulic fluid delivered from the through hole 360 to the gap passage 362 is a large-diameter portion. 368 are formed in the axial direction. The step 371 formed between the small diameter portion 366 and the large diameter portion 368 of the sleeve 314 is mounted with an O-ring 372 for sealing, and the mounting portion when the cap 316 is mounted on the sleeve 314 is mounted. Leakage of hydraulic fluid to the outside is prevented.

  The cap 316 has the slit 364 formed on the inner peripheral surface, but the inner peripheral surface is formed so that a gap is formed between the sleeve 314 and the sleeve 314 when the cap 316 is attached to the sleeve 314. It may be. The gap constitutes a part of the communication path 359.

  This eliminates the need to form a groove on the inner peripheral surface of the cap 316, which facilitates the processing of the cap 316. In addition, since a gap is formed on the entire circumference between the outer peripheral surface of the sleeve 314 and the inner peripheral surface of the cap 316, there is no need for press-fitting when the sleeve 314 is attached to the cap 316. Improves.

  FIG. 6 is an enlarged cross-sectional view in the vicinity of a step portion of a modified example of the sleeve 314 according to the fourth embodiment. The step 374 shown in FIG. 6 is provided with a circumferential groove 376 in the circumferential direction, and the communication passage 359 includes a gap passage 362 or a gap, a through hole 360, a path 370, and a circumferential groove 376. ing. By providing the circumferential groove 376 in the step 374 of the electromagnetic valve 310 in this way, even if the circumferential phase of the body of the electromagnetic valve 310 does not match between the gap passage 362 and the path 370 of the sleeve 314, Since the hydraulic fluid is led out to the back chamber 353 through the entire circumferential groove 376, the phase alignment when assembling the sleeve 314 and the cap 316 becomes unnecessary, and the assembling process can be simplified.

(Fifth embodiment)
In the sealing means according to the fifth embodiment, a case will be described in which the reaction pin according to each of the above embodiments is sealed by a plurality of seal members. FIG. 7 is an enlarged cross-sectional view of the vicinity of the seal portion according to the fifth embodiment. For convenience of explanation, an example in which the sealing means according to the present embodiment is applied to the electromagnetic valve 10 according to the first embodiment will be described. However, the present invention can also be applied to other embodiments. .

  The sealing means 400 seals between the valve chamber 23 and the back chamber 30 so that the rod member 24 can move. Usually, since the back chamber 30 has a higher pressure than the valve chamber 23, the deformation of the seal member tends to increase. Accordingly, the sealing means 400 is disposed on the valve chamber 23 side, and on the back chamber 30 side, the second sealing member 400 is harder than the first seal member 402 and has a low crushing rate. The sealing member 404 is provided. The first seal member 402 and the second seal member 404 are juxtaposed with the backup rings 406, 408, 410 in the annular groove 36 formed on the inner peripheral surface of the body 12.

  Thus, by making the crushing rate of the second seal member 404 disposed on the back chamber 30 side lower than that of the first seal member 402, the tightening force can be lowered and the sliding resistance can be lowered. Further, by making the first seal member 402 softer than the second seal member 404, it is possible to improve the mobility of the moving member and to prevent minute leakage of the hydraulic fluid from the second seal member 404. it can.

  As described above, the present invention has been described with reference to the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and the configurations of the embodiments are appropriately combined or replaced. Those are also included in the present invention. Various modifications such as design changes can be added to each embodiment based on the knowledge of those skilled in the art, and the embodiments to which such modifications are added are also included in the scope of the present invention. sell.

It is sectional drawing which showed typically the schematic structure of the solenoid valve which concerns on 1st Embodiment. It is sectional drawing which showed typically schematic structure of the solenoid valve which concerns on 2nd Embodiment. It is sectional drawing which showed typically schematic structure of the solenoid valve which concerns on 3rd Embodiment. It is a whole perspective view of the solenoid valve concerning a 4th embodiment. FIG. 5 is a cross-sectional view taken along the line A-A ′ of FIG. 4. It is an expanded sectional view near the step part of the modification of the sleeve which concerns on 4th Embodiment. It is an expanded sectional view near the seal part concerning a 5th embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Solenoid valve, 12 Body, 14 Solenoid, 16 Introducing port, 18 Deriving port, 20 Valve hole, 22 Valve seat, 23 Valve chamber, 24 Rod member, 24a Valve body part, 24b Flange part, 24c Small diameter part, 26 Fixed iron core , 28 electromagnetic coil, 30 back chamber, 32 insertion hole, 34 O-ring, 36 annular groove, 38 communication path, 310 solenoid valve, 312 body, 313 solenoid, 314 sleeve, 316 cap, 318 introduction port, 320 outlet port, 322 Valve seat member, 326 Valve seat, 328 Valve element, 330 Rod member, 332 Suction part, 334 Plunger, 336 Electromagnetic coil, 342 Flange part, 344 Valve chamber, 346 Back pressure chamber, 348 Insertion hole, 350 Reaction force pin, 353 Back room , 359 communication path, 360 through-hole, 362 gap path, 364 slit, 370 path, 376 circumferential groove, 400 sealing means, 402 first seal member, 404 second seal member.

Claims (16)

A solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing in the hydraulic circuit,
A solenoid,
Body,
A hydraulic passage formed from the inlet for introducing the hydraulic fluid to the outlet for extracting the hydraulic fluid, formed inside the body;
A valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage;
Opening and closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic pressure passage;
A back chamber formed so that a space between the valve chamber and the valve seat side is sealed on the back surface portion on the side opposite to the valve seat side of both ends in the moving direction of the opening and closing means,
A communication path communicating from the inlet to the back chamber without passing through the valve seat;
A suction part that sucks the opening / closing means away from the valve seat by electromagnetic force generated when a current flows through the solenoid;
A biasing member that biases the opening / closing means in a valve closing direction,
The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure caused by hydraulic fluid flowing into the back chamber ,
The body is
A sleeve in which the valve chamber is formed inside, and a through hole is formed on a side surface closer to the introduction port than the valve seat;
A groove is formed in the inner peripheral surface so that a gap passage is formed between the sleeve and the outer peripheral surface of the sleeve, and the back chamber is formed between the sleeve and the bottom surface. A cap having a recess formed in the inner bottom so as to be formed;
Have
The gap passage, an electromagnetic valve which is characterized that you configure at least part of said communication path. A solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing in the hydraulic circuit,
A solenoid,
Body,
A hydraulic passage formed from the inlet for introducing the hydraulic fluid to the outlet for extracting the hydraulic fluid, formed inside the body;
A valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage;
Opening and closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic pressure passage;
A back chamber formed so that a space between the valve chamber and the valve seat side is sealed on the back surface portion on the side opposite to the valve seat side of both ends in the moving direction of the opening and closing means,
A communication path communicating from the inlet to the back chamber without passing through the valve seat;
A suction part that sucks the opening / closing means away from the valve seat by electromagnetic force generated when a current flows through the solenoid;
The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure caused by hydraulic fluid flowing into the back chamber,
The switching means is a seal area of contact with the said valve seat A1 is Ri pressure area A2 der below the liquid pressure by the hydraulic fluid which has flowed into the rear chamber is applied to the switching means,
The body is
A sleeve in which the valve chamber is formed inside, and a through hole is formed on a side surface closer to the introduction port than the valve seat;
A groove is formed in the inner peripheral surface so that a gap passage is formed between the sleeve and the outer peripheral surface of the sleeve, and the back chamber is formed between the sleeve and the bottom surface. A cap having a recess formed in the inner bottom so as to be formed;
Have
The gap passage, an electromagnetic valve which is characterized that you configure at least part of said communication path.   The electromagnetic valve according to claim 2, further comprising a biasing member that biases the opening / closing means in a valve closing direction. A solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing in the hydraulic circuit,
A solenoid,
Body,
A hydraulic passage formed from the inlet for introducing the hydraulic fluid to the outlet for extracting the hydraulic fluid, formed inside the body;
A valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage;
Opening and closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic pressure passage;
A back chamber formed so that a space between the valve chamber and the valve seat side is sealed on the back surface portion on the side opposite to the valve seat side of both ends in the moving direction of the opening and closing means,
A communication path communicating from the inlet to the back chamber without passing through the valve seat;
A suction part that sucks the opening / closing means in a direction to contact the valve seat by electromagnetic force generated when a current flows through the solenoid;
A biasing member that biases the opening / closing means in a valve opening direction,
The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure caused by hydraulic fluid flowing into the back chamber ,
The body is
A sleeve in which the valve chamber is formed inside, and a through hole is formed on a side surface closer to the introduction port than the valve seat;
A groove is formed in the inner peripheral surface so that a gap passage is formed between the sleeve and the outer peripheral surface of the sleeve, and the back chamber is formed between the sleeve and the bottom surface. A cap having a recess formed in the inner bottom so as to be formed;
Have
The gap passage, an electromagnetic valve which is characterized that you configure at least part of said communication path. A solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing in the hydraulic circuit,
A solenoid,
Body,
A hydraulic passage formed from the inlet for introducing the hydraulic fluid to the outlet for extracting the hydraulic fluid, formed inside the body;
A valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage;
Opening and closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic pressure passage;
A back chamber formed so that a space between the valve chamber and the valve seat side is sealed on the back surface portion on the side opposite to the valve seat side of both ends in the moving direction of the opening and closing means,
A communication path communicating from the inlet to the back chamber without passing through the valve seat;
A suction part that sucks in a direction in which the opening / closing means is brought into contact with the valve seat by an electromagnetic force generated when a current flows through the solenoid;
The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure caused by hydraulic fluid flowing into the back chamber,
The sealing area A1 in a state where the opening and closing means is in contact with the valve seat state, and are pressurized area A2 than that applied to the liquid pressure by the hydraulic fluid which has flowed into the rear chamber said opening and closing means,
The body is
A sleeve in which the valve chamber is formed inside, and a through hole is formed on a side surface closer to the introduction port than the valve seat;
A groove is formed in the inner peripheral surface so that a gap passage is formed between the sleeve and the outer peripheral surface of the sleeve, and the back chamber is formed between the sleeve and the bottom surface. A cap having a recess formed in the inner bottom so as to be formed;
Have
The gap passage, an electromagnetic valve which is characterized that you configure at least part of said communication path.   The electromagnetic valve according to claim 5, further comprising a biasing member that biases the opening / closing means in a valve opening direction. The sleeve is
A stepped cylindrical member having a small diameter portion and a large diameter portion,
A path for leading the hydraulic fluid delivered from the through hole to the gap passage is formed in the large diameter portion,
The step is provided with circumferential grooves in the circumferential direction.
The communication passage, the through hole, the path, the entire circumferential groove, the solenoid valve according to any one of claims 1 to 6, characterized in that it is configured to include the gap channels. A solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing in the hydraulic circuit,
A solenoid,
Body,
A hydraulic passage formed from the inlet for introducing the hydraulic fluid to the outlet for extracting the hydraulic fluid, formed inside the body;
A valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage;
Opening and closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic pressure passage;
A back chamber formed so that a space between the valve chamber and the valve seat side is sealed on the back surface portion on the side opposite to the valve seat side of both ends in the moving direction of the opening and closing means,
A communication path communicating from the inlet to the back chamber without passing through the valve seat;
A suction part that sucks the opening / closing means away from the valve seat by electromagnetic force generated when a current flows through the solenoid;
A biasing member that biases the opening / closing means in a valve closing direction,
The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure caused by hydraulic fluid flowing into the back chamber ,
The body is
A sleeve in which the valve chamber is formed inside, and a through hole is formed on a side surface closer to the introduction port than the valve seat;
An inner peripheral surface is formed so that a gap is formed around the sleeve while being attached to the sleeve, and the back chamber is formed between the sleeve and the bottom surface of the sleeve. A cap having a recess formed in the inner bottom so that
Have
The gap, solenoid valves, characterized that you configure at least part of said communication path. A solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing in the hydraulic circuit,
A solenoid,
Body,
A hydraulic passage formed from the inlet for introducing the hydraulic fluid to the outlet for extracting the hydraulic fluid, formed inside the body;
A valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage;
Opening and closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic pressure passage;
A back chamber formed so that a space between the valve chamber and the valve seat side is sealed on the back surface portion on the side opposite to the valve seat side of both ends in the moving direction of the opening and closing means,
A communication path communicating from the inlet to the back chamber without passing through the valve seat;
A suction part that sucks the opening / closing means away from the valve seat by electromagnetic force generated when a current flows through the solenoid;
The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure caused by hydraulic fluid flowing into the back chamber,
The switching means is a seal area of contact with the said valve seat A1 is Ri pressure area A2 der below the liquid pressure by the hydraulic fluid which has flowed into the rear chamber is applied to the switching means,
The body is
A sleeve in which the valve chamber is formed inside, and a through hole is formed on a side surface closer to the introduction port than the valve seat;
An inner peripheral surface is formed so that a gap is formed around the sleeve while being attached to the sleeve, and the back chamber is formed between the sleeve and the bottom surface of the sleeve. A cap having a recess formed in the inner bottom so that
Have
The gap, solenoid valves, characterized that you configure at least part of said communication path. The solenoid valve according to claim 9 , further comprising a biasing member that biases the opening / closing means in a valve closing direction. A solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing in the hydraulic circuit,
A solenoid,
Body,
A hydraulic passage formed from the inlet for introducing the hydraulic fluid to the outlet for extracting the hydraulic fluid, formed inside the body;
A valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage;
Opening and closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic pressure passage;
A back chamber formed so that a space between the valve chamber and the valve seat side is sealed on the back surface portion on the side opposite to the valve seat side of both ends in the moving direction of the opening and closing means,
A communication path communicating from the inlet to the back chamber without passing through the valve seat;
A suction part that sucks the opening / closing means in a direction to contact the valve seat by electromagnetic force generated when a current flows through the solenoid;
A biasing member that biases the opening / closing means in a valve opening direction,
The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure caused by hydraulic fluid flowing into the back chamber ,
The body is
A sleeve in which the valve chamber is formed inside, and a through hole is formed on a side surface closer to the introduction port than the valve seat;
An inner peripheral surface is formed so that a gap is formed around the sleeve while being attached to the sleeve, and the back chamber is formed between the sleeve and the bottom surface of the sleeve. A cap having a recess formed in the inner bottom so that
Have
The gap, solenoid valves, characterized that you configure at least part of said communication path. A solenoid-driven solenoid valve for controlling the hydraulic pressure of the hydraulic fluid flowing in the hydraulic circuit,
A solenoid,
Body,
A hydraulic passage formed from the inlet for introducing the hydraulic fluid to the outlet for extracting the hydraulic fluid, formed inside the body;
A valve chamber formed on the outlet side from a valve seat provided in the middle of the hydraulic pressure passage;
Opening and closing means arranged in the valve chamber and configured to be able to contact and separate from the valve seat, and capable of opening and closing the hydraulic pressure passage;
A back chamber formed so that a space between the valve chamber and the valve seat side is sealed on the back surface portion on the side opposite to the valve seat side of both ends in the moving direction of the opening and closing means,
A communication path communicating from the inlet to the back chamber without passing through the valve seat;
A suction part that sucks in a direction in which the opening / closing means is brought into contact with the valve seat by an electromagnetic force generated when a current flows through the solenoid;
The opening / closing means receives a force in a direction toward the valve seat by a hydraulic pressure caused by hydraulic fluid flowing into the back chamber,
The sealing area A1 in a state where the opening and closing means is in contact with the valve seat state, and are pressurized area A2 than that applied to the liquid pressure by the hydraulic fluid which has flowed into the rear chamber said opening and closing means,
The body is
A sleeve in which the valve chamber is formed inside, and a through hole is formed on a side surface closer to the introduction port than the valve seat;
An inner peripheral surface is formed so that a gap is formed around the sleeve while being attached to the sleeve, and the back chamber is formed between the sleeve and the bottom surface of the sleeve. A cap having a recess formed in the inner bottom so that
Have
The gap, solenoid valves, characterized that you configure at least part of said communication path. The electromagnetic valve according to claim 12 , further comprising a biasing member that biases the opening / closing means in a valve opening direction. The sleeve is
A stepped cylindrical member having a small diameter portion and a large diameter portion,
A path for leading the hydraulic fluid delivered from the through hole to the gap is formed in the large diameter portion,
The step is provided with circumferential grooves in the circumferential direction.
The solenoid valve according to any one of claims 8 to 13 , wherein the communication path includes the through hole, the path, the entire circumferential groove, and the gap. The opening / closing means includes
A valve body that is arranged so as to be able to contact and separate from the valve seat and can open and close the valve portion;
A plunger that supports the end of the valve body opposite to the valve seat side, and that is opposed to the suction portion;
It is arranged between the plunger and the back chamber so as to abut the end of the plunger on the back chamber side, and is movable in the direction toward the valve seat while pressing the plunger by the hydraulic pressure of the back chamber. A configured moving member;
Solenoid valve according to any one of claims 1 to 14, characterized in that it has a. A sealing means for sealing between the valve chamber and the back chamber so that the opening / closing means is movable;
The sealing means includes
A first seal member disposed on the valve chamber side;
A second seal member disposed on the back chamber side and having a hardness higher than that of the first seal member and a low crushing rate;
Solenoid valve according to any one of claims 1 to 1 5, characterized in that it has a.

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