WO1997039245A1 - Dispositif pour deplacer le tiroir d'une vanne de regulation - Google Patents

Dispositif pour deplacer le tiroir d'une vanne de regulation Download PDF

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Publication number
WO1997039245A1
WO1997039245A1 PCT/JP1997/001202 JP9701202W WO9739245A1 WO 1997039245 A1 WO1997039245 A1 WO 1997039245A1 JP 9701202 W JP9701202 W JP 9701202W WO 9739245 A1 WO9739245 A1 WO 9739245A1
Authority
WO
WIPO (PCT)
Prior art keywords
port
spool
chamber
pressure
pressure reducing
Prior art date
Application number
PCT/JP1997/001202
Other languages
English (en)
Japanese (ja)
Inventor
Shuji Hori
Taketoshi Sakamoto
Naoki Ishizaki
Original Assignee
Komatsu Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd. filed Critical Komatsu Ltd.
Publication of WO1997039245A1 publication Critical patent/WO1997039245A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves

Definitions

  • the present invention relates to a device for moving a spool of an operation valve for supplying hydraulic oil from a hydraulic source to a hydraulic actuator to a neutral position, a first position, and a second position.
  • a spool As an operation valve for supplying the hydraulic oil from the hydraulic source to the hydraulic actuator, a spool is slidably formed in a spool hole of the valve body, and the spool is moved to a neutral position, a first position, and a second position. It is known to supply hydraulic oil from a hydraulic power source to a hydraulic actuator overnight.
  • a pump port, first and second actuation ports and a tank port are formed in the valve body, and the spool is held at a neutral position where each port is shut off by a spring, and the spool is separated from the neutral position. If the first port is located on one side, the pump port communicates with the first actuator port, the second port communicates with the tank port, and the spool is connected to the other side from the neutral position.
  • an operation valve in which the pump port communicates with the second actuator port when it is in the second position, and the tank port communicates with the first actuator port.
  • the spool With this operating valve, the spool can be moved to the first position by energizing the solenoid of the first proportional electromagnetic pressure reducing valve, and the spool can be moved to the second position by energizing the solenoid of the second proportional electromagnetic reducing valve. You can move.
  • the proportional control valve is mounted on both ends of the valve body, the entire control valve becomes large, and when the control valve is mounted on the vehicle body, etc., the mounting area becomes large. The position is restricted.
  • an object of the present invention is to provide a spool valve moving device for an operation valve which can solve the above-mentioned problem.
  • FIG. 1 is a sectional view of an operation valve showing an embodiment of the present invention.
  • FIG. 2 is an enlarged sectional view of a part for moving a spool.
  • FIG. 3 is a front view of the pressure reducing valve spool.
  • FIG. 4 is a sectional view taken along the line IV-IV in FIG.
  • FIG. 5 is an explanatory view showing a state where the pressure reducing valve spool has moved.
  • FIG. 6 is an explanatory view of an operation lever. Disclosure of the invention
  • the spool 3 is inserted into the spool hole 2 of the valve body 1, and the pump port 7, the first actuator port 8, and the second actuator port 9 are shut off.
  • the pump port 7 communicates with the second work port 9 and in the first position, which connects the first work port 8 and the tank port.
  • the port 7 communicates with the first actuator port 8 and the second actuator port 9 is movably inserted into the second position connecting the tank port, and the spool 3 is moved to the neutral position by the spring 13.
  • the proportional electromagnetic pressure reducing valve 32 is cut off from the first chamber 24 and the second chamber 25 to the hydraulic pressure source, and communicates with the low-pressure side.
  • the first chamber 24 and the second chamber 25 are connected to a hydraulic power source, and the pressure in the second chamber 25 is increased as the amount of current increases from the set minimum current value to the set maximum current value.
  • a spool moving device for an operation valve characterized in that the pressure is sequentially reduced and the first chamber 24 is kept in communication with a hydraulic pressure source.
  • the first chamber 24 and the second chamber 25 have the tank pressure, so that the spool 3 is in the neutral position.
  • the set minimum current value is applied, the pressure oil of the hydraulic power source is supplied to the first chamber 24 and the second chamber 25, and both pressures become equal, and the pressure of the first chamber 24 and the second chamber 25 is received. Due to the difference in the area, the spool 3 moves a full stroke toward the second position. If the energization amount is larger than the set minimum current value, the pressure in the second chamber 25 will be sequentially reduced, so the force for moving the spool 3 toward the second position will decrease, and the spool 3 will be neutralized from the second position. When the pressure in the second chamber 25 reaches a certain pressure, the spool 3 becomes the neutral position, and when the pressure further decreases, the spool 3 moves to the first position by the pressure in the first chamber 24. To the full stroke at the maximum current value.
  • the spool 3 can be moved to the first position in one direction and the second position in the other direction with the neutral position as a boundary.
  • the energization amount of the proportional electromagnetic pressure reducing valve 32 in the first invention is a set intermediate current value between the set minimum current value and the set maximum current value
  • the inside of the second chamber 25 is set.
  • Pressure in the second chamber 25 The force for moving the spool 3 toward the second position and the force for moving the spool 3 toward the first position by the pressure in the first chamber 24 are made equal to each other.
  • This is a spool moving device for an operation valve in which the intermediate current value set to 2 is supplied to hold the spool 3 at the neutral position.
  • the spool 3 since the spool 3 is held at the neutral position by energizing the intermediate current value set to the proportional electromagnetic pressure reducing valve 32, the amount of energization is reduced so that the spool 3 Spool 3 moves to the first position by moving toward the position and increasing.
  • the piston 3 is provided on the spool 3 in the first and second inventions.
  • the first and second chambers 24 and 25 are connected to form a first chamber 24 and a second chamber 25, which are connected to a plunger 30 having a thrust proportional to the amount of electricity of the coil 31, a pressure reducing valve spool 28, and a hydraulic pressure source.
  • Proportional electromagnetic pressure reducing valve 3 2 between first port 33, second port 34 communicating with first chamber 24, third port 35 communicating with second chamber 25, and drain hole 45
  • the pressure reducing valve spool 28 is set to the first position by the second spring 43, and the pressure reducing valve spool 28 is pushed to the second position by the small thrust of the plunger 30, and the plunger
  • the pressure reducing valve spool 28 By increasing the thrust of 30, the pressure reducing valve spool 28 is pushed to the third position, and a first spring 42 is provided between the pressure reducing valve spool 28 and the piston 23. 4 With panel power of 2 The pressure reducing valve spool 28 in the third position is pushed toward the second position, and when the pressure reducing valve spool 28 is in the first position, the first port 33 is shut off, and the second port 3 4 and 3rd port 35 are connected to drain hole 45, and when pressure reducing valve spool 28 is in the 2nd position, 1st port 33, 2nd port 34 and 3rd port 35 are connected.
  • the pressure reducing valve spool 28 when the amount of current to the coil 31 is zero, the pressure reducing valve spool 28 is reliably moved to the first position by the second spring 43, so that, for example, an engine that drives a hydraulic pump
  • the spool 3 can be maintained at the neutral position when the hydraulic oil of the hydraulic pump is not supplied to the first chamber 24 and the second chamber 25 when the engine is started.
  • a spool 3 is slidably inserted into a spool hole 2 of a valve body 1.
  • the valve body 1 has a pump port 7 composed of a main pump port 4, a first pump port 5, and a second pump port 6, and a first actuating port 8 and a first port 8 on both sides of the pump port 7.
  • the 2 port 1, the first tank port 10, and the second tank port 11 are formed to open in the spool holes 2, respectively.
  • the first pump port 5 and the second pump port 6 are in communication.
  • a spring tube 12 is attached to one end surface 1 a of the valve body 1, and a spool 3 is illustrated by a spring 13, a first spring receiver 14, and a second spring receiver 15 provided in the spring tube 12. It is held in the neutral position.
  • the spool 3 has a first small-diameter portion 16, a second small-diameter portion 17, a third small-diameter portion 18, and a slit 19 opened at each small-diameter portion, and the spool 3 is in the neutral position shown in the drawing. And each port is shut off.
  • the spool 3 moves to the right from the neutral position shown to the second position.
  • the main pump port 4 and the second pump port 6 _ , the first pump port 5 and the first actuator port 8, which are always in communication with the second pump port 6, the second actuator port 9 and the second tank port The pump oil at pump port 7 is supplied to port 1 of the first actuator and the oil at port 9 of the second actuator flows out to the second tank port 11.
  • a block 20 is attached to the other end surface 1 b of the valve body 1.
  • the block 20 communicates with the spool hole 2 and has a piston hole 21 from which the spool 3 protrudes and a pressure reducing valve hole 22 formed concentrically, and a piston fitted into the piston hole 21
  • Reference numeral 23 is connected to the spool 3 to form a first chamber 24 and a second chamber 25.
  • the small diameter portion 23a of the piston 23 projects into the pressure reducing valve hole 22.
  • a sleeve 27 provided on a plate 26 is fitted in the pressure reducing valve hole 22, and a pressure reducing valve spool 28 is fitted in the sleeve 27.
  • the pressure reducing valve spool 28 is pushed by a plunger 30 of a proportional solenoid 29, and the plunger 30 is pushed with a thrust proportional to the amount of electricity supplied to the coil 31 to produce a proportional electromagnetic pressure reducing valve 32. Is composed.
  • a first port 33, a second port 34, and a third port 35 are formed in the sleeve 27 as shown in FIG.
  • the first port 33 communicates with the pilot oil pressure source at the first oil hole 36
  • the second port 34 communicates with the first chamber 24 at the second oil hole 37
  • the third port 35 Is in communication with the second chamber 25 through a third oil hole 38.
  • a plurality of slits 39 are formed at an intermediate portion in the longitudinal direction of the outer peripheral surface of the pressure reducing valve spool 28 at intervals in the circumferential direction.
  • a plurality of depressurizing slits 40 are formed at an end of the outer peripheral surface of the pool 28 from the third port 35 at intervals in the circumferential direction.
  • a first spring 42 is provided between the spring receiver 41 abutting the sleeve 27 and the piston 23, and a second sprig 43 is provided between the sprig receiver 41 and the pressure reducing valve spool 28. It is provided.
  • the second spring 43 has a lower panel force than the first spring 42.
  • the pressure reducing valve spool 28 has a blind hole 44 opened in the pressure reducing valve hole 22, and the blind hole 44 is opened in the outer peripheral surface through a drain hole 45.
  • An opening is formed at one end face at a port 46, and the pressure reducing valve hole 22 communicates with the first tank port 10 at a drain oil hole 47.
  • the amount of current to coil 31 is set to zero, and the thrust of plunger 30 is set to zero.
  • the pressure reducing valve spool 28 is pushed to the left by the second spring 43 to the position shown in FIG. 2, the spring receiver 41 contacts the sleeve 27, and the spring receiver 41 and the pressure reducing valve spool 28 are connected to each other. Separate. As a result, the first port 33 is shut off without communication between the slit 39 and the first port 33, the second port 34 and the third port 35 are communicated with the slit 39, and the drain is closed. Hole 45 opens into the second port 34.
  • the first chamber 24 has the second oil hole 37, the second port 3.4, the drain hole 45, the blind hole 44, the pressure reducing valve hole 22, the drain oil hole 47, and the first tank port 1
  • the second chamber 25 has a third oil hole 38, a third port 35, a slit 39, a drain hole 45, a blind hole 44, a pressure reducing valve hole 22, Drain oil hole 47 communicates with first tank port 10. Because of this, the first chamber 24 and the second chamber 25 have the tank pressure, and no force acts on the spool 3 by the piston 23, so that the spool 3 is in the neutral position by the spring 13.
  • the first port 33 shuts off the discharge pressure oil of the pilot hydraulic pump. Not supplied to the first chamber 24 and the second chamber 25. Therefore, the spool 3 does not move when the engine is started.
  • the pressure oil in the first oil hole 36 is supplied to the first chamber 24 via the first port 33, the slit 39, the second port 34, and the second oil hole 37, and the first chamber
  • the pressure P 1 in 24 becomes the pressure P 0 in the first oil hole 36.
  • the pressure oil in the first oil hole 36 is supplied to the second chamber 25 via the first port 33, the slit 39, the third port 35, and the third oil hole 38, and the second chamber 25 is supplied to the second chamber 25.
  • the pressure P 2 in 35 is the pressure P 0 in the first oil hole 36, which is P 1 -P 2.
  • PA is the pressure receiving area of the first pressure receiving chamber 24
  • PB is the pressure receiving area of the second pressure receiving chamber 25.
  • a rightward force of (F2—F1) acts on the piston 23 to push the spool 3 rightward against the spring 13.
  • the spring force of the spring 13 increases, and the spool 3 is pushed rightward until the panel force of the spring 13 and the rightward force (F2-F1) are balanced.
  • the rightward force (F2-F1) is the largest, and eventually the spool 3 moves a full stroke toward the second position. (Refer to the phantom line in Fig. 2.)
  • the first spring 42 expands to reduce the panel force, but the spring force at that time is set to be larger than the spring force of the second spring 43. 41 does not move.
  • the plunger 30 causes the pressure reducing valve spool 28 to stake on the first spring 42 via the panel receiver 41 and move further to the right, as shown in FIG. 5, to allow the slit 39 and the third port 35 to move. Is shut off, and the third port 35 communicates with the pressure reducing valve hole 22 through the pressure reducing slit 40.
  • the pressure oil in the first chamber 24 continues to be supplied, but the pressure oil in the second chamber 25 is supplied to the third port 35, the pressure reducing slit 40, the port 46, the blind hole 44, the pressure reducing valve hole 22, Since the fluid flows out to the first tank port 10 through the drain oil hole 47, the pressure P2 in the second chamber 25 is reduced. As the pressure P2 in the second chamber 25 decreases, the rightward force F2 decreases, and the difference F2—F1 (P2X PB—P) XPA between the rightward force F2 and the leftward force F1 decreases. Therefore, the spool 3 is moved to the left (neutral position) by the spring 13.
  • the pressure P2 in the second chamber 25 is uniquely determined by the thrust of the plunger 30 and the spring force of the first spring 42 depending on the position of the spool 3. Therefore, the spool 3 stops accurately at a position corresponding to the amount of current supplied to the coil 31.
  • the thrust of the plunger 30 is increased by making the current flowing through the coil 31 larger than the intermediate current value set above. Since the pressure reducing valve spool 28 moves rightward to open the pressure reducing slit 40 and the third port 35, the pressure P2 in the second chamber 25 further decreases.
  • the spool 3 moves toward the first position by sequentially increasing the energization amount of the coil 31 from the set intermediate current value, and moves the full stroke at the set maximum current value.
  • the pressure reducing valve spool 28 communicates and shuts off the first chamber 24 and the second chamber 25 with the pilot hydraulic power source and the drain, and reduces the pressure in the second chamber 25. Has functions.
  • the operation lever 50 can be swung from the neutral position N to the first position A and the second position B, and when the operation lever 50 is in the neutral position N, the coil 31 is connected.
  • a predetermined current value is applied and swinging toward the first position A, the amount of current to the coil 31 increases, and when swinging toward the second position B, the amount of current to the coil 31 decreases. It becomes possible to make it.
  • the spool 3 of the operation valve can be moved with the same operation feeling as when the operation valve is switched and operated by a general hydraulic pilot valve.
  • the potentiometer 51 is rotated by the operation lever 50, and the potentiometer 51
  • the amount of current to the coil 31 may be controlled by a control or the like according to the output value.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Servomotors (AREA)
  • Sliding Valves (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

Une seule électrovanne de réduction de pression proportionnelle permet à un tiroir de se mettre dans des première et deuxième positions séparées par une position neutre. Un tiroir (3) est mis dans des première et deuxième positions séparées par une position neutre, grâce à la liaison d'un piston (23) audit tiroir (3) de sorte que soient définies une première chambre (24) présentant une zone de réception de pression supérieure ainsi qu'une deuxième chambre (25) présentant une zone de réception de pression inférieure, ce qui permet à une électrovanne de réduction de pression proportionnelle (32) d'alimenter la première (24) et la deuxième chambre (25) en huile sous pression, d'augmenter la quantité de courant électrique envoyée à l'électrovanne de réduction de pression proportionnelle (32) de sorte que la pression soit réduite progressivement dans la deuxième chambre (25). De plus, le piston (23) est déplacé dans un sens et dans l'autre en fonction de la différence de pression entre les première (24) et deuxième chambres (25) et de la réduction de pression dans la deuxième chambre.
PCT/JP1997/001202 1996-04-17 1997-04-08 Dispositif pour deplacer le tiroir d'une vanne de regulation WO1997039245A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP09512796A JP3726924B2 (ja) 1996-04-17 1996-04-17 操作弁のスプール移動装置
JP8/95127 1996-04-17

Publications (1)

Publication Number Publication Date
WO1997039245A1 true WO1997039245A1 (fr) 1997-10-23

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ID=14129167

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1997/001202 WO1997039245A1 (fr) 1996-04-17 1997-04-08 Dispositif pour deplacer le tiroir d'une vanne de regulation

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JP (1) JP3726924B2 (fr)
WO (1) WO1997039245A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1058011A1 (fr) * 1999-06-02 2000-12-06 Robert Bosch Gmbh Distributeur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE545451C2 (en) * 2021-03-31 2023-09-12 Parker Hannifin Emea Sarl A method and valve arrangement for controlling motion of a spool of a directional control valve

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58140379U (ja) * 1982-03-17 1983-09-21 豊興工業株式会社 電磁方向切換弁
JPS61153005A (ja) * 1984-12-27 1986-07-11 Hitachi Constr Mach Co Ltd 油圧機器の変位制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58140379U (ja) * 1982-03-17 1983-09-21 豊興工業株式会社 電磁方向切換弁
JPS61153005A (ja) * 1984-12-27 1986-07-11 Hitachi Constr Mach Co Ltd 油圧機器の変位制御装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1058011A1 (fr) * 1999-06-02 2000-12-06 Robert Bosch Gmbh Distributeur

Also Published As

Publication number Publication date
JP3726924B2 (ja) 2005-12-14
JPH09280387A (ja) 1997-10-28

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