WO2020161900A1 - Pressure control valve and hydraulic pilot-type proportional electromagnetic control valve provided with said pressure control valve - Google Patents

Pressure control valve and hydraulic pilot-type proportional electromagnetic control valve provided with said pressure control valve Download PDF

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Publication number
WO2020161900A1
WO2020161900A1 PCT/JP2019/004658 JP2019004658W WO2020161900A1 WO 2020161900 A1 WO2020161900 A1 WO 2020161900A1 JP 2019004658 W JP2019004658 W JP 2019004658W WO 2020161900 A1 WO2020161900 A1 WO 2020161900A1
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Prior art keywords
control valve
poppet
sleeve
valve
pressure control
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PCT/JP2019/004658
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French (fr)
Japanese (ja)
Inventor
将悟 後川
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株式会社島津製作所
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Priority to PCT/JP2019/004658 priority Critical patent/WO2020161900A1/en
Priority to JP2020570325A priority patent/JP7147881B2/en
Publication of WO2020161900A1 publication Critical patent/WO2020161900A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve

Definitions

  • the present invention relates to a pressure control valve and a hydraulic pilot type electromagnetic proportional control valve equipped with this pressure control valve.
  • the fork In a forklift truck as an industrial vehicle, the fork is moved by supplying hydraulic pressure generated by a hydraulic pump to a hydraulic cylinder as an actuator.
  • the hydraulic fluid sent from the hydraulic pump is supplied to the hydraulic cylinder via the control valve.
  • an operator operates an operation part such as a lever, and the operation force at this time is used to move the spool of the control valve to control the hydraulic oil supplied to the hydraulic cylinder. Valve is used.
  • an electromagnetic proportional control valve instead of a manual control valve (see Patent Document 1).
  • This electromagnetic proportional control valve uses a solenoid as an actuator, and has a configuration in which the spool is moved by using the solenoid drive and pilot pressure based on an electric signal. Since the electromagnetic proportional control valve controls the operation based on an electric signal, when the electromagnetic proportional control valve is used in a forklift, the operating part can be arranged at any position, which gives design freedom. There is a merit of improving.
  • the operating pressure may be retained in the hydraulic oil in the hydraulic cylinder, the control valve, and the pipe connecting these after use. If the pipe or the like is removed while the hydraulic oil has a residual pressure, high-pressure hydraulic oil is jetted out, which is dangerous. Therefore, it is necessary to perform depressurizing work to reduce the pressure of the hydraulic oil.
  • a port and B port for connecting high-pressure hydraulic oil from a pump line to a double-acting hydraulic cylinder, even if the spool is moved, both It is not possible to depressurize ports at the same time. Therefore, when the pressure release of the A port is performed, the B port is in the high pressure state, and when the pressure release of the B port is performed, the A port is in the high pressure state.
  • Patent Document 2 discloses a valve device for gas, in which a communication space sealed by a seal member is provided between a high pressure part and a low pressure part, and the pressure is released by dropping the seal member into the communication space. There is.
  • Patent Document 3 a valve body having a communication hole for discharging the pressure fluid in the fluid pipe, a seal member having the same diameter arranged on the outer circumference of the valve body with the communication hole interposed, and a circumferential groove are provided.
  • a flow path opening member, the sealing member in the moving direction of the flow path opening member is located in the circumferential groove, and from the gap formed by the valve body and the flow path opening member through the circumferential groove from the communication hole.
  • a residual pressure relief adapter for discharging pressurized fluid is disclosed.
  • the present invention has been made to solve the above problems, and a pressure control valve capable of easily performing depressurization without providing a dedicated bypass circuit and a hydraulic pilot type electromagnetic valve including the pressure control valve. It is intended to provide a proportional control valve.
  • a valve body a seat member arranged in the valve body, a position in contact with a valve seat formed in the seat member, and a position separated from the valve seat formed in the seat member.
  • a spring biasing the poppet toward a valve seat formed in the seat member, and a position of an end of the spring opposite to the poppet.
  • a pressure control valve capable of easily performing depressurization without providing a dedicated bypass circuit, and a hydraulic pilot type electromagnetic proportional control valve equipped with this pressure control valve.
  • FIG. 3 is a cross-sectional view of a hydraulic pilot type electromagnetic proportional control valve 50 including the pressure control valve 10 according to the embodiment of the present invention.
  • 3 is a front view of the pressure control valve 10.
  • FIG. 3 is a side view of the pressure control valve 10.
  • FIG. 3 is a sectional view taken along line AA in FIG. 2.
  • FIG. 3 is a sectional view taken along line AA in FIG. 2.
  • FIG. 1 is a sectional view of a hydraulic pilot type electromagnetic proportional control valve 50 (hereinafter, simply referred to as “control valve 50”) including a pressure control valve 10 according to an embodiment of the present invention.
  • control valve 50 a hydraulic pilot type electromagnetic proportional control valve 50
  • the spool 60 is shown in the neutral position.
  • the control valve 50 is connected to a hydraulic cylinder 40 for moving a fork 42 on which a cargo is placed in a forklift as an industrial vehicle.
  • the control valve 50 includes a P port 101 that is a hydraulic oil supply port into which high-pressure hydraulic oil is introduced from a hydraulic pump, and a T port 102 that is a recovery port for hydraulic oil that is opened to a low pressure region such as a hydraulic tank. Is selectively connected to the A port 103 as the first cargo handling port for moving the piston 41 of the hydraulic cylinder 40 or the B port 104 as the second cargo handling port.
  • the control valve 50 has a plurality of land portions and a plurality of groove portions alternately formed, and includes a spool 60 that can reciprocate in the left-right direction shown in FIG.
  • the spool 60 is biased toward the neutral position shown in FIG. 1 by the action of the pair of springs 61 and 62.
  • the control valve 50 also includes a pair of solenoids 52 and 53 for moving the spool 60 and a pair of spool valves 56 and 57.
  • the spool 60 moves to the right as shown in FIG.
  • the pressure control valve 10 is connected to each of the hydraulic oil passage communicating with the A port 103 and the hydraulic oil passage communicating with the B port 104.
  • the pressure control valve 10 functions as a relief valve during normal operation.
  • the pressure control valve 10 also functions as a means for depressurizing the hydraulic oil.
  • FIG. 2 is a front view of the pressure control valve 10
  • FIG. 3 is a side view of the pressure control valve 10.
  • 4 and 5 are sectional views taken along the line AA in FIG. Note that FIG. 4 shows a normal state, and FIG. 5 shows a state in which pressure release work is performed by the pressure control valve 10. Further, the members painted black in FIGS. 4 and 5 are O-rings.
  • the pressure control valve 10 is a balance piston type configuration including a main sleeve 12 supported by a valve body 11 and a main poppet 15 slidably arranged in the main sleeve 12 with respect to the main sleeve 12. Has become.
  • the main poppet 15 includes a hollow member 13 that forms a passage for hydraulic oil.
  • the main poppet 15 including the hollow member 13 is biased by a spring 16 as a biasing means in a direction in which the right end in FIG. 4 contacts the valve seat region formed on the main sleeve 12. Further, the hollow member 13 which is a part of the main poppet 15 is formed with an orifice 14 which connects the A port 103 or the B port 104 shown in FIG.
  • a pressure difference of the hydraulic oil occurs before and after the main poppet 15. Then, the pressure of the hydraulic oil that acts on the upstream surface (the surface on the right side in FIG. 4) of the main poppet 15 exceeds the total value of the pressure that acts on the downstream surface (the surface on the left side in FIG.
  • the main poppet 15 provided with the hollow member 13 moves by a pilot method. That is, the pilot poppet 21 is arranged downstream of the main poppet 15 in order to control the flow rate of the main poppet 15 passing through the orifice 14.
  • the pilot poppet 21 is urged toward the valve seat surface of the seat member 17 provided at one end of the main sleeve 12 by the action of the spring 22.
  • the pilot poppet 21 separates from the valve seat surface of the seat member 17, and inside the main sleeve 12.
  • the hydraulic oil of FIG. 1 flows out to the T port 102 shown in FIG.
  • the hydraulic oil passes through the orifice 14 of the main poppet 15, and a pressure difference occurs between the upstream surface and the downstream surface of the main poppet 15, so that the main poppet 15 opens.
  • the end of the spring 22 that biases the pilot poppet 21 toward the seat member 17 is opposite to the end of the spring 22 that is in contact with the pilot poppet 21, and is in contact with the positioning member 25 disposed in the sleeve 23. ..
  • the sleeve 23 is coupled to the valve body 11 by using a screw portion 71. Further, the sleeve 23 and the positioning member 25 are coupled by using the screw portion 72.
  • the positions of the main poppet 15 and the pilot poppet 21 in the sleeve 23 in the moving direction (first direction) are determined by the flange portion 27 of the sleeve 23 contacting the edge of the valve body 11.
  • the flange portion 27 of the sleeve 23 functions as a positioning member for positioning the sleeve 23 in the first direction.
  • the position of the positioning member 25 in the first direction which is the moving direction of the pilot poppet 21 with respect to the sleeve 23
  • the lock nut 24 coupled using the positioning member 25 and the screw portion 73.
  • the biasing force of the pilot poppet 21 against the seat member 17 can be adjusted by changing the position of the positioning member 25 with respect to the sleeve 23 in the first direction using the lock nut 24.
  • the biasing force of the pilot poppet 21 with respect to the seat member 17 can be made constant, and as a result, with respect to the main poppet 15.
  • the pilot pressure can be kept constant.
  • a groove 26 is formed around the entire circumference of the sleeve 23. Then, a screw 29 that is screwed into the valve body 11 is arranged from the side surface of the valve body 11 toward the inside. The tip of the screw 29 is arranged in the groove 26.
  • the screw 29 and the concave groove 26 function as a restricting member that restricts the reciprocal movement distance of the sleeve 23 in the first direction.
  • the hydraulic oil in the hydraulic oil passage communicating with the A port 103 or the hydraulic oil passage communicating with the B port 104 is When the pressure becomes equal to or higher than the set value, the pilot poppet 21 and the main poppet 15 sequentially move, and the hydraulic fluid in the hydraulic fluid passage communicating with the A port 103 or the hydraulic fluid passage communicating with the B port 104 becomes T Outflows to port 102. In this state, the pressure control valve 10 functions as a relief valve.
  • the sleeve 23 is separated from the seat member 17 by rotating the sleeve 23 with respect to the valve body 11, as shown in FIG. Direction (leftward in FIG. 5).
  • the pilot poppet 21 and the spring 22 also move together with the sleeve 23, and the pilot poppet 21 is separated from the seat member 17.
  • the sleeve 23 is rotated with respect to the valve body 11 to move the sleeve 23 in the direction approaching the seat member 17 (the direction opposite to the first direction).
  • the sleeve 23 is positioned at the initial position by the flange portion 27 of the sleeve 23 coming into contact with the end edge of the valve body 11.
  • the position of the positioning member 25 in the first direction with respect to the sleeve 23 is maintained constant by the lock nut 24. Therefore, even after the depressurization work, the urging force of the pilot poppet 21 on the seat member 17 can be made constant, and thus the pilot pressure on the main poppet 15 can be kept constant. Therefore, it is possible to maintain the relief pressure constant even when the pressure relief valve 10 is used to perform the pressure relief work.
  • the pressure control valve 10 according to the embodiment of the present invention is applied to the hydraulic pilot type electromagnetic proportional control valve 50 in the above-described embodiment, the spool 60 is used instead of the hydraulic pilot type electromagnetic proportional control valve 50.
  • the pressure control valve 10 according to the embodiment of the present invention may be applied to a manual control valve that is manually moved. Further, the pressure control valve 10 according to the embodiment of the present invention may be applied to a hydraulic circuit other than the control valve.
  • the valve body, the seat member disposed in the valve body, the position in contact with the valve seat formed in the seat member, and the seat member are formed.
  • a poppet that moves in a first direction between a position separated from the valve seat, a spring that biases the poppet toward a valve seat formed in the seat member, and the poppet in the spring.
  • a pressure control valve comprising: an adjusting member that adjusts the biasing force of the spring on the poppet by changing the position of the end on the opposite side, in the valve body with the adjusting member supported.
  • a pressure control valve including: a sleeve capable of reciprocating in the first direction; and a positioning member that positions the sleeve with respect to the first direction.
  • the pressure control valve of the first aspect by moving the sleeve to form the passage between the poppet and the seat member, the pressure control valve can be provided without providing a dedicated bypass circuit for the hydraulic circuit. It is possible to easily perform depressurization at the valve.
  • the embodiment according to the first aspect of the present invention is the pressure control valve, wherein the positioning member is a flange portion formed on the opposite side of the sleeve from the poppet and abutting on the valve body.
  • Another embodiment according to the first aspect is a pressure control valve including a regulating member that regulates a reciprocating movement distance of the sleeve in the first direction.
  • Yet another embodiment according to the first aspect of the present invention is a valve body, a main sleeve supported by the valve body, and a position in the main sleeve that abuts a valve seat formed on the main sleeve.
  • a main poppet having an orifice formed therein so as to be slidable in a first direction between a position separated from a valve seat formed on the main sleeve, and the main poppet formed on the main sleeve.
  • a spring for the main poppet that urges toward the valve seat, a seat member fixed to the end of the main sleeve opposite to the main poppet, and a position that abuts the valve seat formed on the seat member.
  • a pilot poppet that controls the inflow of hydraulic fluid from an orifice formed in the main poppet by moving in a first direction between a position separated from the valve seat formed in the seat member, By changing the position of the pilot poppet spring that biases the pilot poppet toward the valve seat formed in the seat member, and the position of the end of the pilot poppet spring opposite to the pilot poppet.
  • a balance piston type pressure control valve comprising: an adjusting member for adjusting the biasing force of the pilot poppet spring to the pilot poppet; A sleeve capable of reciprocating in one direction, and a flange portion that is formed on the opposite side of the sleeve from the pilot poppet and that positions the sleeve in the first direction by contacting the valve body. , And a pressure control valve.
  • the pressure control valve functions as a relief valve
  • the urging force of the pilot poppet against the seat member can be made constant even after depressurizing work.
  • the pilot pressure for the poppet can be kept constant, and the relief pressure can be kept constant.
  • a housing in which a hydraulic oil supply port, a first cargo handling port, and a second cargo handling port are formed is reciprocated, and the first and second housings are reciprocated.
  • Hydraulic pilot type electromagnetic proportional control valve provided with a spool for selectively connecting the cargo handling port and the second cargo handling port to the hydraulic oil supply port, and a spool moving mechanism for reciprocating the spool by a hydraulic pilot method.
  • the pressure control valve according to the above-described first embodiment is connected to a passage for hydraulic fluid communicating with at least one of the first cargo handling port and the second cargo handling port. ..

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)
  • Valve Housings (AREA)

Abstract

This pressure control valve (10) is provided with: a valve body (11); a seat member (17) installed inside the valve body (11); a poppet (21) that moves in a first direction between a position abutting a valve seat formed on the seat member (17) and a position spaced away from the valve seat formed on the seat member (17); a spring (22) that urges the poppet (21) toward the valve seat formed on the seat member (17); and an adjusting member (25) that adjusts the urging force applied to the poppet (21) by the spring (22) by changing the position of an end part of the spring (22) on the opposite side from the poppet (21), the pressure control valve (10) being provided with: a sleeve (23) that can move reciprocally in the first direction inside the valve body (11) while supporting the adjusting member (25); and a positioning member (27) that positions the sleeve (23) in the first direction.

Description

圧力制御弁およびこの圧力制御弁を備えた油圧パイロット式電磁比例コントロールバルブPressure control valve and hydraulic pilot type solenoid proportional control valve equipped with this pressure control valve
　この発明は、圧力制御弁およびこの圧力制御弁を備えた油圧パイロット式電磁比例コントロールバルブに関する。 The present invention relates to a pressure control valve and a hydraulic pilot type electromagnetic proportional control valve equipped with this pressure control valve.
　産業車両としてのフォークリフト等においては、油圧ポンプにより生じた油圧をアクチュエータとしての油圧シリンダに供給することで、フォークを移動させる構成を有する。油圧ポンプから送液された作動油は、コントロールバルブを介して油圧シリンダに供給される。このようなコントロールバルブとして、オペレータがレバー等の操作部を操作し、このときの操作力を利用してコントロールバルブのスプールを移動させることにより、油圧シリンダに供給する作動油を制御する手動式コントロールバルブが使用されている。 In a forklift truck as an industrial vehicle, the fork is moved by supplying hydraulic pressure generated by a hydraulic pump to a hydraulic cylinder as an actuator. The hydraulic fluid sent from the hydraulic pump is supplied to the hydraulic cylinder via the control valve. As such a control valve, an operator operates an operation part such as a lever, and the operation force at this time is used to move the spool of the control valve to control the hydraulic oil supplied to the hydraulic cylinder. Valve is used.
　また、このようなフォークリフトにおいて、手動式コントロールバルブにかえて電磁比例式コントロールバルブを使用するものも提案されている（特許文献１参照）。この電磁比例コントロールバルブは、アクチュエータとしてソレノイドを使用し、電気信号に基づくソレノイドの駆動とパイロット圧とを利用してスプールを移動させる構成を有する。電磁比例式コントロールバルブは電気信号に基づいて動作を制御することから、フォークリフトにおいて電磁比例式コントロールバルブを使用した場合には、操作部を任意の位置に配置することができ、設計の自由度が向上するというメリットがある。 Also, in such a forklift, it has been proposed to use an electromagnetic proportional control valve instead of a manual control valve (see Patent Document 1). This electromagnetic proportional control valve uses a solenoid as an actuator, and has a configuration in which the spool is moved by using the solenoid drive and pilot pressure based on an electric signal. Since the electromagnetic proportional control valve controls the operation based on an electric signal, when the electromagnetic proportional control valve is used in a forklift, the operating part can be arranged at any position, which gives design freedom. There is a merit of improving.
　このようなコントロールバルブを使用した油圧回路においては、使用後に油圧シリンダやコントロールバルブおよびこれらを接続する配管内における作動油に、作動圧力が保持される場合がある。このように作動油に残圧がある状態で、配管等を取り外すと、高圧の作動油が噴出して危険であることから、作動油の圧力を低下させる圧抜き作業を行う必要がある。 In a hydraulic circuit using such a control valve, the operating pressure may be retained in the hydraulic oil in the hydraulic cylinder, the control valve, and the pipe connecting these after use. If the pipe or the like is removed while the hydraulic oil has a residual pressure, high-pressure hydraulic oil is jetted out, which is dangerous. Therefore, it is necessary to perform depressurizing work to reduce the pressure of the hydraulic oil.
　コントロールバルブにおいて圧抜きを実行するためには、圧抜き専用のバイパス回路やバルブを設けることが考えられるが、このような構成を採用した場合においては、高圧部と低圧部を短絡させるためのバイパスラインを設ける必要があり、コントロールバルブが大型化するという問題がある。 In order to execute depressurization in the control valve, it is conceivable to provide a bypass circuit or valve dedicated to depressurization. However, when such a configuration is adopted, a bypass for short-circuiting the high pressure part and the low pressure part is used. Since it is necessary to provide a line, there is a problem that the control valve becomes large.
　また、ポンプラインからの高圧の作動油を複動式の油圧シリンダに接続するためのＡポートおよびＢポートと呼称される一対のポートを有するコントロールバルブにおいては、スプールを移動させたとしても、両方のポートの圧抜きを同時に実行することはできない。このため、Ａポートの圧抜きを実行したときにはＢポートが高圧状態となり、Ｂポートの圧抜きを実行したときにはＡポートが高圧状態となる。 Further, in a control valve having a pair of ports called A port and B port for connecting high-pressure hydraulic oil from a pump line to a double-acting hydraulic cylinder, even if the spool is moved, both It is not possible to depressurize ports at the same time. Therefore, when the pressure release of the A port is performed, the B port is in the high pressure state, and when the pressure release of the B port is performed, the A port is in the high pressure state.
　さらに、コントロールバルブとして、電磁比例コントロールバルブを使用した場合においては、スプールを移動させるためにパイロット圧が必要となることから、コントロールバルブに高圧の作動油が供給されていない状態においては、スプールの移動により圧抜き作業を実行することは不可能である。フォークリフト等においては、配管等の部品の交換を行う場合に、油圧回路や電気回路が遮断された状態においても、圧抜き作業を実行したいという要請がある。 Furthermore, when an electromagnetic proportional control valve is used as the control valve, pilot pressure is required to move the spool.Therefore, when high pressure hydraulic oil is not supplied to the control valve, the spool It is impossible to perform depressurization work by moving. In a forklift or the like, there is a demand for performing depressurizing work even when a hydraulic circuit or an electric circuit is cut off when replacing parts such as piping.
　特許文献２は、気体に対する弁装置において、高圧部と低圧部の間にシール部材によりシールされた連通空間を設け、シール部材を連通空間に脱落させることにより圧抜きを行う弁装置が開示されている。 Patent Document 2 discloses a valve device for gas, in which a communication space sealed by a seal member is provided between a high pressure part and a low pressure part, and the pressure is released by dropping the seal member into the communication space. There is.
　また、特許文献３には、流体管内の圧力流体を排出するための連通孔を有するバルブ体と、この連通孔を挟んでバルブ体外周に配置した同径のシール部材と、円周溝を有する流路開放部材とを備え、流路開放部材の移動方向にあるシール部材を円周溝に位置させ、連通孔から円周溝を介してバルブ体と流路開放部材とによって形成される隙間から圧力流体を排出する残圧抜きアダプタが開示されている。 Further, in Patent Document 3, a valve body having a communication hole for discharging the pressure fluid in the fluid pipe, a seal member having the same diameter arranged on the outer circumference of the valve body with the communication hole interposed, and a circumferential groove are provided. A flow path opening member, the sealing member in the moving direction of the flow path opening member is located in the circumferential groove, and from the gap formed by the valve body and the flow path opening member through the circumferential groove from the communication hole. A residual pressure relief adapter for discharging pressurized fluid is disclosed.
特開２０１３－２０３５１０号公報JP, 2013-203510, A 特開２０１２－１３２５０３号公報JP 2012-132503 A 特開２００１－２０８２２１号公報Japanese Patent Laid-Open No. 2001-208221
　特許文献１に記載された電磁比例コントロールバルブにおいては、圧抜き専用のバイパス回路やバルブを設けなければ、圧抜きを実行することはできない。このため、電磁比例コントロールバルブを使用した油圧回路においては、作動油の圧力が低下するまで放置することにより圧抜きを行う必要がある。一方、特許文献２および特許文献３に記載されたように、シール部材を脱落させること等により圧抜きを行う場合には、内部に配置されるシール部材が損傷する可能性があるだけではなく、圧抜き状態を外部から確認し得ないという問題がある。このような問題は、電磁比例コントロールバルブに限らず、各種の油圧機器において生ずる問題である。 In the electromagnetic proportional control valve described in Patent Document 1, depressurization cannot be executed unless a bypass circuit or valve dedicated to depressurization is provided. For this reason, in a hydraulic circuit using an electromagnetic proportional control valve, it is necessary to release the pressure by leaving it until the pressure of the hydraulic oil decreases. On the other hand, as described in Patent Document 2 and Patent Document 3, when pressure release is performed by dropping the seal member or the like, not only the seal member disposed inside may be damaged but also There is a problem that the pressure release state cannot be confirmed from the outside. Such a problem occurs not only in the electromagnetic proportional control valve but also in various hydraulic equipment.
　この発明は上記課題を解決するためになされたものであり、専用のバイパス回路を設けることなく容易に圧抜きを実行することが可能な圧力制御弁およびこの圧力制御弁を備えた油圧パイロット式電磁比例コントロールバルブを提供することを目的とする。 The present invention has been made to solve the above problems, and a pressure control valve capable of easily performing depressurization without providing a dedicated bypass circuit and a hydraulic pilot type electromagnetic valve including the pressure control valve. It is intended to provide a proportional control valve.
　この発明は、バルブボディと、前記バルブボディ内に配設されたシート部材と、前記シート部材に形成された弁座と当接する位置と前記シート部材に形成された弁座から離隔する位置との間を第１の方向に移動するポペットと、前記ポペットを前記シート部材に形成された弁座に向けて付勢するバネと、前記バネにおける前記ポペットとは逆側の端部の位置を変更することにより、前記バネによる前記ポペットへの付勢力を調整する調整部材と、を備えた圧力制御弁において、前記調整部材を支持した状態で、前記バルブボディ内を前記第１の方向に往復移動可能なスリーブと、前記スリーブを前記第１の方向に対して位置決めする位置決め部材と、を備える。 According to the present invention, there are provided a valve body, a seat member arranged in the valve body, a position in contact with a valve seat formed in the seat member, and a position separated from the valve seat formed in the seat member. Between the poppet moving in a first direction, a spring biasing the poppet toward a valve seat formed in the seat member, and a position of an end of the spring opposite to the poppet. Thus, in a pressure control valve including an adjusting member that adjusts the biasing force of the spring on the poppet, it is possible to reciprocate in the valve body in the first direction while supporting the adjusting member. And a positioning member that positions the sleeve with respect to the first direction.
　この発明によれば、専用のバイパス回路を設けることなく容易に圧抜きを実行することが可能な圧力制御弁およびこの圧力制御弁を備えた油圧パイロット式電磁比例コントロールバルブが提供される。 According to the present invention, there is provided a pressure control valve capable of easily performing depressurization without providing a dedicated bypass circuit, and a hydraulic pilot type electromagnetic proportional control valve equipped with this pressure control valve.
この発明の実施形態に係る圧力制御弁１０を備えた油圧パイロット式電磁比例コントロールバルブ５０の断面図である。FIG. 3 is a cross-sectional view of a hydraulic pilot type electromagnetic proportional control valve 50 including the pressure control valve 10 according to the embodiment of the present invention. 圧力制御弁１０の正面図である。3 is a front view of the pressure control valve 10. FIG. 圧力制御弁１０の側面図である。3 is a side view of the pressure control valve 10. FIG. 図２におけるＡ－Ａ断面図である。FIG. 3 is a sectional view taken along line AA in FIG. 2. 図２におけるＡ－Ａ断面図である。FIG. 3 is a sectional view taken along line AA in FIG. 2.
　以下、この発明の実施の形態を図面に基づいて説明する。図１は、この発明の実施形態に係る圧力制御弁１０を備えた油圧パイロット式電磁比例コントロールバルブ５０（以下、単に「コントロールバルブ５０」という）の断面図である。なお、この図においては、スプール６０が中立位置に配置された状態を示している。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a hydraulic pilot type electromagnetic proportional control valve 50 (hereinafter, simply referred to as “control valve 50”) including a pressure control valve 10 according to an embodiment of the present invention. In this figure, the spool 60 is shown in the neutral position.
　このコントロールバルブ５０は、産業車両としてのフォークリフトにおいて貨物を載置したフォーク４２を移動させるための油圧シリンダ４０に連結されるものである。このコントロールバルブ５０は、油圧ポンプから高圧の作動油が導入される作動油の供給ポートであるＰポート１０１と、油圧タンク等の低圧域に開放される作動油に回収ポートであるＴポート１０２とを、油圧シリンダ４０のピストン４１を移動させるための第１の荷役ポートとしてのＡポート１０３または第２の荷役ポートとしてのＢポート１０４に選択的に接続するためのものである。 The control valve 50 is connected to a hydraulic cylinder 40 for moving a fork 42 on which a cargo is placed in a forklift as an industrial vehicle. The control valve 50 includes a P port 101 that is a hydraulic oil supply port into which high-pressure hydraulic oil is introduced from a hydraulic pump, and a T port 102 that is a recovery port for hydraulic oil that is opened to a low pressure region such as a hydraulic tank. Is selectively connected to the A port 103 as the first cargo handling port for moving the piston 41 of the hydraulic cylinder 40 or the B port 104 as the second cargo handling port.
　このコントロールバルブ５０は、複数のランド部と複数の溝部とが交互に形成されるとともに、ハウジング５１に対して図１に示す左右方向に往復移動可能なスプール６０を備える。このスプール６０は、一対のバネ６１、６２の作用により、図１に示す中立位置に向けて付勢されている。また、このコントロールバルブ５０は、スプール６０を移動させるための一対のソレノイド５２、５３と、一対のスプール弁５６、５７を備える。スプール６０は、ソレノイド５２におけるプランジャ５４とパイロット圧の作動油を受けて機能するスプール弁５６との作用により図１に示す右方向に移動するとともに、ソレノイド５３におけるプランジャ５５とパイロット圧の作動油を受けて機能するスプール弁５７との作用により図１に示す左方向に移動する。 The control valve 50 has a plurality of land portions and a plurality of groove portions alternately formed, and includes a spool 60 that can reciprocate in the left-right direction shown in FIG. The spool 60 is biased toward the neutral position shown in FIG. 1 by the action of the pair of springs 61 and 62. The control valve 50 also includes a pair of solenoids 52 and 53 for moving the spool 60 and a pair of spool valves 56 and 57. The spool 60 moves to the right as shown in FIG. 1 by the action of the plunger 54 in the solenoid 52 and the spool valve 56 that functions by receiving the hydraulic oil of pilot pressure, and at the same time, the spool 55 receives the hydraulic oil of the plunger 55 and pilot pressure in the solenoid 53. By the action of the spool valve 57 that receives and functions, it moves to the left as shown in FIG.
　スプール６０が図１に示す状態から右方向に移動したときには、スプール６０における溝部６３の作用によりＰポート１０１が流路１１０を介してＡポート１０３に接続されるとともに、スプール６０における溝部６４の作用によりＴポート１０２がＢポート１０４に接続される。これにより、油圧シリンダ４０におけるピストン４１は、図１における右方向に移動する。また、スプール６０が図１に示す状態から左方向に移動したときには、スプール６０における溝部６４の作用によりＰポート１０１が流路１１０を介してＢポート１０４に接続されるとともに、スプール６０における溝部６３の作用によりＴポート１０２がＡポート１０３に接続される。これにより、油圧シリンダ４０におけるピストン４１は、図１における左方向に移動する。 When the spool 60 moves to the right from the state shown in FIG. 1, the action of the groove portion 63 in the spool 60 connects the P port 101 to the A port 103 via the flow passage 110, and the action of the groove portion 64 in the spool 60. Causes the T port 102 to be connected to the B port 104. As a result, the piston 41 of the hydraulic cylinder 40 moves to the right in FIG. When the spool 60 moves to the left from the state shown in FIG. 1, the action of the groove portion 64 in the spool 60 connects the P port 101 to the B port 104 via the flow passage 110 and the groove portion 63 in the spool 60. By the action of, the T port 102 is connected to the A port 103. As a result, the piston 41 of the hydraulic cylinder 40 moves leftward in FIG.
　Ａポート１０３と連通する作動油の通路と、Ｂポート１０４に連通する作動油の通路には、各々、この発明の実施形態に係る圧力制御弁１０が接続されている。この圧力制御弁１０は、通常の動作時には、リリーフ弁として機能するものである。そして、この圧力制御弁１０は、作動油の圧抜き手段としても機能するものである。 The pressure control valve 10 according to the embodiment of the present invention is connected to each of the hydraulic oil passage communicating with the A port 103 and the hydraulic oil passage communicating with the B port 104. The pressure control valve 10 functions as a relief valve during normal operation. The pressure control valve 10 also functions as a means for depressurizing the hydraulic oil.
　図２は、圧力制御弁１０の正面図であり、図３は、圧力制御弁１０の側面図である。また、図４および図５は、図２におけるＡ－Ａ断面図である。なお、図４は、通常の状態を示し、図５は、圧力制御弁１０により圧抜き作業を実行する状態を示している。また、図４および図５において黒く塗りつぶされた部材は、オーリングである。 FIG. 2 is a front view of the pressure control valve 10, and FIG. 3 is a side view of the pressure control valve 10. 4 and 5 are sectional views taken along the line AA in FIG. Note that FIG. 4 shows a normal state, and FIG. 5 shows a state in which pressure release work is performed by the pressure control valve 10. Further, the members painted black in FIGS. 4 and 5 are O-rings.
　この圧力制御弁１０は、バルブボディ１１に支持されるメインスリーブ１２と、このメインスリーブ１２内においてメインスリーブ１２に対してスライド可能に配設されたメインポペット１５とを備えたバランスピストン型の構成となっている。メインポペット１５は、作動油の通路を形成する中空部材１３を備えている。 The pressure control valve 10 is a balance piston type configuration including a main sleeve 12 supported by a valve body 11 and a main poppet 15 slidably arranged in the main sleeve 12 with respect to the main sleeve 12. Has become. The main poppet 15 includes a hollow member 13 that forms a passage for hydraulic oil.
　中空部材１３を備えるメインポペット１５は、付勢手段としてのスプリング１６により、図４における右側の端部がメインスリーブ１２に形成された弁座領域と当接する方向に付勢されている。また、メインポペット１５の一部である中空部材１３には、図１に示すＡポート１０３またはＢポート１０４とメインスリーブ１２内の空間とを連通するオリフィス１４が形成されている。このオリフィス１４を通過する作動油の流れが生ずると、メインポペット１５の前後に作動油の圧力差が生ずる。そして、メインポペット１５における上流面（図４における右側の面）に作用する作動油の圧力が、下流面（図４における左側の面）に作用する圧力とスプリング１６による付勢力の合計値を上回ると、メインポペット１５がメインスリーブ１２内をスライドし、メインスリーブ１２における弁座領域から離隔する。これにより、図１に示すＡポート１０３またはＢポート１０４からＴポート１０２に至る作動油の通路が開口し、図１に示すＡポート１０３またはＢポート１０４の余剰作動油をＴポート１０２に流出させることで、バルブボディ１１内の作動油の最大圧力を保証している。 The main poppet 15 including the hollow member 13 is biased by a spring 16 as a biasing means in a direction in which the right end in FIG. 4 contacts the valve seat region formed on the main sleeve 12. Further, the hollow member 13 which is a part of the main poppet 15 is formed with an orifice 14 which connects the A port 103 or the B port 104 shown in FIG. When the flow of the hydraulic oil that passes through the orifice 14 occurs, a pressure difference of the hydraulic oil occurs before and after the main poppet 15. Then, the pressure of the hydraulic oil that acts on the upstream surface (the surface on the right side in FIG. 4) of the main poppet 15 exceeds the total value of the pressure that acts on the downstream surface (the surface on the left side in FIG. 4) and the urging force of the spring 16. Then, the main poppet 15 slides in the main sleeve 12 and is separated from the valve seat region of the main sleeve 12. As a result, the passage for hydraulic oil from the A port 103 or B port 104 shown in FIG. 1 to the T port 102 is opened, and excess hydraulic oil from the A port 103 or B port 104 shown in FIG. Therefore, the maximum pressure of the hydraulic oil in the valve body 11 is guaranteed.
　中空部材１３を備えたメインポペット１５は、パイロット方式によって移動する。すなわち、メインポペット１５におけるオリフィス１４の通過流量を制御するため、メインポペット１５の下流にパイロットポペット２１が配設されている。このパイロットポペット２１は、スプリング２２の作用により、メインスリーブ１２の一端に配設されたシート部材１７における弁座面に向けて付勢されている。パイロットポペット２１における上流面（シート部材１７側の面）に作用する作動油の圧力がスプリング２２による付勢力を上回ると、パイロットポペット２１はシート部材１７の弁座面から離間し、メインスリーブ１２内の作動油を図１に示すＴポート１０２に流出させる。これにより、メインポペット１５におけるオリフィス１４内を作動油が通過し、メインポペット１５における上流面と下流面との間に圧力差が生じることで、メインポペット１５が開弁する。 The main poppet 15 provided with the hollow member 13 moves by a pilot method. That is, the pilot poppet 21 is arranged downstream of the main poppet 15 in order to control the flow rate of the main poppet 15 passing through the orifice 14. The pilot poppet 21 is urged toward the valve seat surface of the seat member 17 provided at one end of the main sleeve 12 by the action of the spring 22. When the pressure of the hydraulic oil acting on the upstream surface (the surface on the side of the seat member 17) of the pilot poppet 21 exceeds the biasing force of the spring 22, the pilot poppet 21 separates from the valve seat surface of the seat member 17, and inside the main sleeve 12. Of the hydraulic oil of FIG. 1 flows out to the T port 102 shown in FIG. As a result, the hydraulic oil passes through the orifice 14 of the main poppet 15, and a pressure difference occurs between the upstream surface and the downstream surface of the main poppet 15, so that the main poppet 15 opens.
　パイロットポペット２１をシート部材１７に向けて付勢するスプリング２２におけるパイロットポペット２１と当接する側の端部と逆側の端部は、スリーブ２３内に配設された位置決め部材２５と当接している。スリーブ２３は、バルブボディ１１に対して、ネジ部７１を利用して結合されている。また、スリーブ２３と位置決め部材２５とは、ネジ部７２を利用して結合されている。スリーブ２３におけるメインポペット１５およびパイロットポペット２１の移動方向（第１の方向）の位置は、スリーブ２３におけるフランジ部２７がバルブボディ１１の端縁と当接することにより位置決めされる。スリーブ２３におけるフランジ部２７は、スリーブ２３を第１の方向に対して位置決めするための位置決め部材として機能する。 The end of the spring 22 that biases the pilot poppet 21 toward the seat member 17 is opposite to the end of the spring 22 that is in contact with the pilot poppet 21, and is in contact with the positioning member 25 disposed in the sleeve 23. .. The sleeve 23 is coupled to the valve body 11 by using a screw portion 71. Further, the sleeve 23 and the positioning member 25 are coupled by using the screw portion 72. The positions of the main poppet 15 and the pilot poppet 21 in the sleeve 23 in the moving direction (first direction) are determined by the flange portion 27 of the sleeve 23 contacting the edge of the valve body 11. The flange portion 27 of the sleeve 23 functions as a positioning member for positioning the sleeve 23 in the first direction.
　また、位置決め部材２５におけるスリーブ２３に対するパイロットポペット２１の移動方向である第１の方向の位置は、位置決め部材２５とネジ部７３を利用して結合されるロックナット２４により調整可能となっている。パイロットポペット２１のシート部材１７に対する付勢力は、ロックナット２４を利用してスリーブ２３に対する位置決め部材２５の第１の方向の位置を変化させることにより調整することができる。そして、ロックナット２４によりスリーブ２３に対する位置決め部材２５の第１の方向の位置を固定することにより、パイロットポペット２１のシート部材１７に対する付勢力を一定とすることができ、これにより、メインポペット１５に対するパイロット圧を一定に維持することができる。 Further, the position of the positioning member 25 in the first direction, which is the moving direction of the pilot poppet 21 with respect to the sleeve 23, can be adjusted by the lock nut 24 coupled using the positioning member 25 and the screw portion 73. The biasing force of the pilot poppet 21 against the seat member 17 can be adjusted by changing the position of the positioning member 25 with respect to the sleeve 23 in the first direction using the lock nut 24. Then, by fixing the position of the positioning member 25 with respect to the sleeve 23 in the first direction by the lock nut 24, the biasing force of the pilot poppet 21 with respect to the seat member 17 can be made constant, and as a result, with respect to the main poppet 15. The pilot pressure can be kept constant.
　スリーブ２３の外周部には、全周に亘って凹溝２６が形成されている。そして、バルブボディ１１と螺合するネジ２９が、バルブボディ１１の側面から内部に向かって配設されている。ネジ２９の先端は、凹溝２６内に配置されている。このネジ２９および凹溝２６の作用により、スリーブ２３における第１の方向への往復移動距離を規制することができる。ネジ２９および凹溝２６は、スリーブ２３における第１の方向への往復移動距離を規制する規制部材として機能する。 A groove 26 is formed around the entire circumference of the sleeve 23. Then, a screw 29 that is screwed into the valve body 11 is arranged from the side surface of the valve body 11 toward the inside. The tip of the screw 29 is arranged in the groove 26. By the action of the screw 29 and the concave groove 26, the reciprocating distance of the sleeve 23 in the first direction can be restricted. The screw 29 and the concave groove 26 function as a restricting member that restricts the reciprocal movement distance of the sleeve 23 in the first direction.
　以上のような構成を有する圧力制御弁１０においては、図４に示す通常の使用状態では、Ａポート１０３と連通する作動油の通路またはＢポート１０４に連通する作動油の通路内の作動油の圧力が設定値以上となったときには、パイロットポペット２１およびメインポペット１５が順次移動し、Ａポート１０３と連通する作動油の通路またはＢポート１０４に連通する作動油の通路内の作動油は、Ｔポート１０２に流出する。この状態においては、圧力制御弁１０はリリーフ弁として機能する。 In the pressure control valve 10 having the above-described configuration, in the normal use state shown in FIG. 4, the hydraulic oil in the hydraulic oil passage communicating with the A port 103 or the hydraulic oil passage communicating with the B port 104 is When the pressure becomes equal to or higher than the set value, the pilot poppet 21 and the main poppet 15 sequentially move, and the hydraulic fluid in the hydraulic fluid passage communicating with the A port 103 or the hydraulic fluid passage communicating with the B port 104 becomes T Outflows to port 102. In this state, the pressure control valve 10 functions as a relief valve.
　一方、配管等の部品の交換を行うために圧抜き作業を実行するときには、図５に示すように、バルブボディ１１に対してスリーブ２３を回転させることにより、スリーブ２３をシート部材１７から離隔する方向（図５に示す左方向）に移動させる。これにより、パイロットポペット２１およびスプリング２２もスリーブ２３とともに移動し、パイロットポペット２１がシート部材１７から離隔する。 On the other hand, when performing depressurization work for replacing parts such as piping, the sleeve 23 is separated from the seat member 17 by rotating the sleeve 23 with respect to the valve body 11, as shown in FIG. Direction (leftward in FIG. 5). As a result, the pilot poppet 21 and the spring 22 also move together with the sleeve 23, and the pilot poppet 21 is separated from the seat member 17.
　パイロットポペット２１がシート部材１７から離隔すると、オリフィス１４を通過する作動油の流れが発生し、メインポペット１５が中空部材１３とともに、メインスリーブ１２内をスライドして、メインスリーブ１２における弁座領域から離隔する。これにより、図１に示すＡポート１０３またはＢポート１０４からＴポート１０２に至る作動油の通路が開口し、図１に示すＡポート１０３またはＢポート１０４の加圧された作動油をＴポート１０２に流出させることで、バルブボディ１１内の作動油の圧抜き作業を行うことが可能となる。これにより、油圧回路や電気回路が遮断された状態においても、圧抜き作業を実行することが可能となる。 When the pilot poppet 21 is separated from the seat member 17, a flow of hydraulic oil passing through the orifice 14 is generated, and the main poppet 15 slides in the main sleeve 12 together with the hollow member 13 from the valve seat area of the main sleeve 12. Separate. As a result, the passage for hydraulic oil from the A port 103 or B port 104 shown in FIG. 1 to the T port 102 is opened, and the pressurized hydraulic oil from the A port 103 or B port 104 shown in FIG. It is possible to depressurize the hydraulic oil in the valve body 11 by letting it flow out to the valve. As a result, the depressurization work can be executed even when the hydraulic circuit or the electric circuit is cut off.
　なお、バルブボディ１１に対してスリーブ２３を回転させることにより、スリーブ２３をシート部材１７から離隔する方向に移動させたときに、スリーブ２３が一定の距離だけ移動すれば、図５に示すように、ネジ２９がスリーブ２３に形成された凹溝２６の側面に当接する。これにより、スリーブ２３が過度に移動し、バルブボディ１１から脱落することを防止することが可能となる。 By rotating the sleeve 23 with respect to the valve body 11, when the sleeve 23 is moved in a direction away from the seat member 17, if the sleeve 23 moves a certain distance, as shown in FIG. The screws 29 come into contact with the side surfaces of the concave groove 26 formed in the sleeve 23. This makes it possible to prevent the sleeve 23 from excessively moving and dropping off from the valve body 11.
　圧抜き作業が終了した後には、バルブボディ１１に対してスリーブ２３を回転させることにより、スリーブ２３をシート部材１７に近接する方向（第１の方向とは逆方向）に移動させる。スリーブ２３は、スリーブ２３におけるフランジ部２７がバルブボディ１１の端縁と当接することにより、当初の位置に位置決めされる。このときには、ロックナット２４によりスリーブ２３に対する位置決め部材２５の第１の方向の位置は一定に維持されている。従って、圧抜き作業後においても、パイロットポペット２１のシート部材１７に対する付勢力を一定とすることができ、これにより、メインポペット１５に対するパイロット圧を一定に維持することが可能となる。従って、リリーフ弁として機能する圧力制御弁１０を利用して圧抜き作業を行った場合においても、リリーフ圧力を一定に維持することが可能となる。 After the depressurization work is completed, the sleeve 23 is rotated with respect to the valve body 11 to move the sleeve 23 in the direction approaching the seat member 17 (the direction opposite to the first direction). The sleeve 23 is positioned at the initial position by the flange portion 27 of the sleeve 23 coming into contact with the end edge of the valve body 11. At this time, the position of the positioning member 25 in the first direction with respect to the sleeve 23 is maintained constant by the lock nut 24. Therefore, even after the depressurization work, the urging force of the pilot poppet 21 on the seat member 17 can be made constant, and thus the pilot pressure on the main poppet 15 can be kept constant. Therefore, it is possible to maintain the relief pressure constant even when the pressure relief valve 10 is used to perform the pressure relief work.
　なお、上述した実施形態においては、この発明の実施形態に係る圧力制御弁１０を油圧パイロット式電磁比例コントロールバルブ５０に適用しているが、油圧パイロット式電磁比例コントロールバルブ５０ではなく、スプール６０をマニュアルにより移動させる手動式のコントロールバルブにこの発明の実施形態に係る圧力制御弁１０を適用してもよい。また、この発明の実施形態に係る圧力制御弁１０を、コントロールバルブ以外の油圧回路に適用してもよい。 Although the pressure control valve 10 according to the embodiment of the present invention is applied to the hydraulic pilot type electromagnetic proportional control valve 50 in the above-described embodiment, the spool 60 is used instead of the hydraulic pilot type electromagnetic proportional control valve 50. The pressure control valve 10 according to the embodiment of the present invention may be applied to a manual control valve that is manually moved. Further, the pressure control valve 10 according to the embodiment of the present invention may be applied to a hydraulic circuit other than the control valve.
　以上のように、この発明の第１の態様は、バルブボディと、前記バルブボディ内に配設されたシート部材と、前記シート部材に形成された弁座と当接する位置と前記シート部材に形成された弁座から離隔する位置との間を第１の方向に移動するポペットと、前記ポペットを前記シート部材に形成された弁座に向けて付勢するバネと、前記バネにおける前記ポペットとは逆側の端部の位置を変更することにより、前記バネによる前記ポペットへの付勢力を調整する調整部材と、を備えた圧力制御弁において、前記調整部材を支持した状態で、前記バルブボディ内を前記第１の方向に往復移動可能なスリーブと、前記スリーブを前記第１の方向に対して位置決めする位置決め部材と、を備える圧力制御弁である。 As described above, according to the first aspect of the present invention, the valve body, the seat member disposed in the valve body, the position in contact with the valve seat formed in the seat member, and the seat member are formed. A poppet that moves in a first direction between a position separated from the valve seat, a spring that biases the poppet toward a valve seat formed in the seat member, and the poppet in the spring. A pressure control valve, comprising: an adjusting member that adjusts the biasing force of the spring on the poppet by changing the position of the end on the opposite side, in the valve body with the adjusting member supported. Is a pressure control valve including: a sleeve capable of reciprocating in the first direction; and a positioning member that positions the sleeve with respect to the first direction.
　この第１の態様に係る圧力制御弁によれば、スリーブを移動させることによりポペットとシート部材の間に通路を形成することで、油圧回路に対して専用のバイパス回路を設けることなく、圧力制御弁において容易に圧抜きを実行することが可能となる。 According to the pressure control valve of the first aspect, by moving the sleeve to form the passage between the poppet and the seat member, the pressure control valve can be provided without providing a dedicated bypass circuit for the hydraulic circuit. It is possible to easily perform depressurization at the valve.
　この発明の第１の態様に係る実施形態は、前記位置決め部材は、前記スリーブにおける前記ポペットとは逆側に形成され、前記バルブボディに当接するフランジ部である圧力制御弁である。 The embodiment according to the first aspect of the present invention is the pressure control valve, wherein the positioning member is a flange portion formed on the opposite side of the sleeve from the poppet and abutting on the valve body.
　このような構成を採用することにより、スリーブを容易に適正な位置に位置決めすることが可能となる。 By adopting such a configuration, it becomes possible to easily position the sleeve at an appropriate position.
　この第１の態様に係る他の実施形態は、前記スリーブにおける前記第１の方向への往復移動距離を規制する規制部材を備えた圧力制御弁である。 Another embodiment according to the first aspect is a pressure control valve including a regulating member that regulates a reciprocating movement distance of the sleeve in the first direction.
　このような構成を採用することにより、スリーブがバルブボディから脱落することを防止することが可能となる。 By adopting such a configuration, it is possible to prevent the sleeve from falling off the valve body.
　この発明の第１の態様に係るさらに他の実施形態は、バルブボディと、前記バルブボディに支持されたメインスリーブと、前記メインスリーブ内において、前記メインスリーブに形成された弁座と当接する位置と前記メインスリーブに形成された弁座から離隔する位置との間を第１の方向にスライド可能に配設され、オリフィスが形成されたメインポペットと、前記メインポペットを前記メインスリーブに形成された弁座に向けて付勢するメインポペット用のバネと、前記メインスリーブにおける前記メインポペットとは逆側の端部に固定されたシート部材と、前記シート部材に形成された弁座と当接する位置と前記シート部材に形成された弁座から離隔する位置との間を前記第１の方向に移動することにより、前記メインポペットに形成されたオリフィスからの作動液の流入を制御するパイロットポペットと、前記パイロットポペットを前記シート部材に形成された弁座に向けて付勢するパイロットポペット用のバネと、前記パイロットポペット用のバネにおける前記パイロットポペットとは逆側の端部の位置を変更することにより、前記パイロットポペット用のバネによる前記パイロットポペットへの付勢力を調整する調整部材と、を備えたバランスピストン型の圧力制御弁において、前記調整部材を支持した状態で、前記バルブボディ内を前記第１の方向に往復移動可能なスリーブと、前記スリーブにおける前記パイロットポペットとは逆側に形成され、前記バルブボディに当接することにより、前記スリーブを前記第１の方向に対して位置決めするフランジ部と、を備えた圧力制御弁である。 Yet another embodiment according to the first aspect of the present invention is a valve body, a main sleeve supported by the valve body, and a position in the main sleeve that abuts a valve seat formed on the main sleeve. A main poppet having an orifice formed therein so as to be slidable in a first direction between a position separated from a valve seat formed on the main sleeve, and the main poppet formed on the main sleeve. A spring for the main poppet that urges toward the valve seat, a seat member fixed to the end of the main sleeve opposite to the main poppet, and a position that abuts the valve seat formed on the seat member. And a pilot poppet that controls the inflow of hydraulic fluid from an orifice formed in the main poppet by moving in a first direction between a position separated from the valve seat formed in the seat member, By changing the position of the pilot poppet spring that biases the pilot poppet toward the valve seat formed in the seat member, and the position of the end of the pilot poppet spring opposite to the pilot poppet. A balance piston type pressure control valve, comprising: an adjusting member for adjusting the biasing force of the pilot poppet spring to the pilot poppet; A sleeve capable of reciprocating in one direction, and a flange portion that is formed on the opposite side of the sleeve from the pilot poppet and that positions the sleeve in the first direction by contacting the valve body. , And a pressure control valve.
　このような構成を採用することにより、圧力制御弁をリリーフ弁として機能させた場合に、圧抜き作業後においても、パイロットポペットのシート部材に対する付勢力を一定とすることができ、これにより、メインポペットに対するパイロット圧を一定に維持することができ、リリーフ圧力を一定に維持することが可能となる。 By adopting such a configuration, when the pressure control valve functions as a relief valve, the urging force of the pilot poppet against the seat member can be made constant even after depressurizing work. The pilot pressure for the poppet can be kept constant, and the relief pressure can be kept constant.
　この発明の第２実施形態は、作動油の供給ポートと、第１の荷役ポートと、第２の荷役ポートとが形成されたハウジングと、前記ハウジング内を往復移動することにより、前記第１の荷役ポートおよび前記第２の荷役ポートを前記作動油の供給ポートに選択的に接続するスプールと、油圧パイロット方式により前記スプールを往復移動させるスプール移動機構と、を備えた油圧パイロット式電磁比例コントロールバルブにおいて、前記第１の荷役ポートまたは前記第２の荷役ポートの少なくとも一方に連通する作動油の通路に、上述した第１実施形態に係る圧力制御弁を接続した油圧パイロット式電磁比例コントロールバルブである。 In a second embodiment of the present invention, a housing in which a hydraulic oil supply port, a first cargo handling port, and a second cargo handling port are formed is reciprocated, and the first and second housings are reciprocated. Hydraulic pilot type electromagnetic proportional control valve provided with a spool for selectively connecting the cargo handling port and the second cargo handling port to the hydraulic oil supply port, and a spool moving mechanism for reciprocating the spool by a hydraulic pilot method. In the hydraulic pilot type electromagnetic proportional control valve, the pressure control valve according to the above-described first embodiment is connected to a passage for hydraulic fluid communicating with at least one of the first cargo handling port and the second cargo handling port. ..
　このような構成によれば、油圧パイロット式電磁比例コントロールバルブに高圧の作動油が供給されていない状態においても、圧抜き作業を実行することが可能となる。 With such a configuration, it is possible to perform depressurization work even when high-pressure hydraulic oil is not supplied to the hydraulic pilot type electromagnetic proportional control valve.
　１０　　　圧力制御弁
　１１　　　バルブボディ
　１２　　　メインスリーブ
　１３　　　中空部材
　１４　　　オリフィス
　１５　　　メインポペット
　１６　　　スプリング
　１７　　　シート部材
　２１　　　パイロットポペット
　２２　　　スプリング
　２３　　　スリーブ
　２４　　　ロックナット
　２５　　　位置決め部材
　２６　　　凹溝
　２７　　　フランジ部
　２９　　　ネジ
　４０　　　油圧シリンダ
　５０　　　油圧パイロット式電磁比例コントロールバルブ
　５１　　　ハウジング
　６０　　　スプール
　１０１　　Ｐポート
　１０２　　Ｔポート
　１０３　　Ａポート
　１０４　　Ｂポート
  10 Pressure Control Valve 11 Valve Body 12 Main Sleeve 13 Hollow Member 14 Orifice 15 Main Poppet 16 Spring 17 Seat Member 21 Pilot Poppet 22 Spring 23 Sleeve 24 Lock Nut 25 Positioning Member 26 Recessed Groove 27 Flange 29 Screw 40 Hydraulic Cylinder 50 Hydraulic Pilot Type Electromagnetic proportional control valve 51 Housing 60 Spool 101 P port 102 T port 103 A port 104 B port

Claims (5)

  1. 　バルブボディと、
    　前記バルブボディ内に配設されたシート部材と、
    　前記シート部材に形成された弁座と当接する位置と前記シート部材に形成された弁座から離隔する位置との間を第１の方向に移動するポペットと、
    　前記ポペットを前記シート部材に形成された弁座に向けて付勢するバネと、
    　前記バネにおける前記ポペットとは逆側の端部の位置を変更することにより、前記バネによる前記ポペットへの付勢力を調整する調整部材と、
    　を備えた圧力制御弁において、
    　前記調整部材を支持した状態で、前記バルブボディ内を前記第１の方向に往復移動可能なスリーブと、
    　前記スリーブを前記第１の方向に対して位置決めする位置決め部材と、
    　を備える圧力制御弁。     Valve body,
    A seat member disposed in the valve body,
    A poppet that moves in a first direction between a position in contact with a valve seat formed in the seat member and a position separated from the valve seat formed in the seat member;
    A spring for biasing the poppet toward the valve seat formed on the seat member;
    An adjusting member that adjusts the biasing force of the spring on the poppet by changing the position of the end of the spring opposite to the poppet,
    In a pressure control valve equipped with
    A sleeve capable of reciprocating in the first direction in the valve body while supporting the adjusting member;
    A positioning member for positioning the sleeve with respect to the first direction;
    Pressure control valve.
  2. 　請求項１に記載の圧力制御弁において、
    　前記位置決め部材は、前記スリーブにおける前記ポペットとは逆側に形成され、前記バルブボディに当接するフランジ部である圧力制御弁。     The pressure control valve according to claim 1,
    The pressure control valve, wherein the positioning member is a flange portion formed on a side of the sleeve opposite to the poppet and abutting on the valve body.
  3. 　請求項１に記載の圧力制御弁において、
    　前記スリーブにおける前記第１の方向への往復移動距離を規制する規制部材を備えた圧力制御弁。     The pressure control valve according to claim 1,
    A pressure control valve including a restriction member that restricts a reciprocating movement distance of the sleeve in the first direction.
  4. 　バルブボディと、
    　前記バルブボディに支持されたメインスリーブと、
    　前記メインスリーブ内において、前記メインスリーブに形成された弁座と当接する位置と前記メインスリーブに形成された弁座から離隔する位置との間を第１の方向にスライド可能に配設され、オリフィスが形成されたメインポペットと、
    　前記メインポペットを前記メインスリーブに形成された弁座に向けて付勢するメインポペット用のバネと、
    　前記メインスリーブにおける前記メインポペットとは逆側の端部に固定されたシート部材と、
    　前記シート部材に形成された弁座と当接する位置と前記シート部材に形成された弁座から離隔する位置との間を前記第１の方向に移動することにより、前記メインポペットに形成されたオリフィスからの作動液の流入を制御するパイロットポペットと、
    　前記パイロットポペットを前記シート部材に形成された弁座に向けて付勢するパイロットポペット用のバネと、
    　前記パイロットポペット用のバネにおける前記パイロットポペットとは逆側の端部の位置を変更することにより、前記パイロットポペット用のバネによる前記パイロットポペットへの付勢力を調整する調整部材と、
    　を備えたバランスピストン型の圧力制御弁において、
    　前記調整部材を支持した状態で、前記バルブボディ内を前記第１の方向に往復移動可能なスリーブと、
    　前記スリーブにおける前記パイロットポペットとは逆側に形成され、前記バルブボディに当接することにより、前記スリーブを前記第１の方向に対して位置決めするフランジ部と、
    　を備えた圧力制御弁。     Valve body,
    A main sleeve supported by the valve body,
    An orifice is provided in the main sleeve so as to be slidable in a first direction between a position in contact with a valve seat formed in the main sleeve and a position separated from the valve seat formed in the main sleeve. A main poppet with a
    A main poppet spring for urging the main poppet toward the valve seat formed in the main sleeve;
    A sheet member fixed to an end of the main sleeve opposite to the main poppet,
    An orifice formed in the main poppet by moving in a first direction between a position in contact with a valve seat formed in the seat member and a position separated from the valve seat formed in the seat member. A pilot poppet that controls the inflow of hydraulic fluid from
    A spring for the pilot poppet that biases the pilot poppet toward the valve seat formed on the seat member,
    An adjusting member that adjusts the biasing force of the spring for the pilot poppet on the pilot poppet by changing the position of the end of the spring for the pilot poppet opposite to the pilot poppet,
    In a balance piston type pressure control valve equipped with
    A sleeve capable of reciprocating in the first direction in the valve body while supporting the adjusting member;
    A flange portion that is formed on the opposite side of the sleeve from the pilot poppet and that positions the sleeve in the first direction by contacting the valve body;
    Pressure control valve with.
  5. 　作動油の供給ポートと、第１の荷役ポートと、第２の荷役ポートとが形成されたハウジングと、
    　前記ハウジング内を往復移動することにより、前記第１の荷役ポートおよび前記第２の荷役ポートを前記作動油の供給ポートに選択的に接続するスプールと、
    　油圧パイロット方式により前記スプールを往復移動させるスプール移動機構と、
    　を備えた油圧パイロット式電磁比例コントロールバルブにおいて、
    　前記第１の荷役ポートまたは前記第２の荷役ポートの少なくとも一方に連通する作動油の通路に、請求項１から請求項４のいずれかの圧力制御弁を接続した油圧パイロット式電磁比例コントロールバルブ。
          A housing in which a hydraulic oil supply port, a first cargo handling port, and a second cargo handling port are formed;
    A spool that selectively connects the first cargo handling port and the second cargo handling port to the hydraulic oil supply port by reciprocating in the housing;
    A spool moving mechanism for reciprocating the spool by a hydraulic pilot system,
    In a hydraulic pilot type electromagnetic proportional control valve equipped with
    A hydraulic pilot type electromagnetic proportional control valve in which the pressure control valve according to any one of claims 1 to 4 is connected to a passage for hydraulic fluid that communicates with at least one of the first cargo handling port and the second cargo handling port.
PCT/JP2019/004658 2019-02-08 2019-02-08 Pressure control valve and hydraulic pilot-type proportional electromagnetic control valve provided with said pressure control valve WO2020161900A1 (en)

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JPS5443735B1 (en) * 1968-12-20 1979-12-21
JPS55181072U (en) * 1979-06-15 1980-12-26
JPS5655765A (en) * 1979-10-12 1981-05-16 Nippon Air Brake Co Ltd Pressure regulaing valve
JP2017067095A (en) * 2015-09-28 2017-04-06 ナブテスコ株式会社 Relief valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5443735B1 (en) * 1968-12-20 1979-12-21
JPS51113818U (en) * 1975-03-12 1976-09-16
JPS55181072U (en) * 1979-06-15 1980-12-26
JPS5655765A (en) * 1979-10-12 1981-05-16 Nippon Air Brake Co Ltd Pressure regulaing valve
JP2017067095A (en) * 2015-09-28 2017-04-06 ナブテスコ株式会社 Relief valve

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