WO1999035408A1 - Soupapes de regulation de pression - Google Patents
Soupapes de regulation de pression Download PDFInfo
- Publication number
- WO1999035408A1 WO1999035408A1 PCT/JP1999/000051 JP9900051W WO9935408A1 WO 1999035408 A1 WO1999035408 A1 WO 1999035408A1 JP 9900051 W JP9900051 W JP 9900051W WO 9935408 A1 WO9935408 A1 WO 9935408A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- receiving chamber
- pressure receiving
- valve
- spool
- Prior art date
Links
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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
-
- 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
- F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
- F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation valves
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
- F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
- F15B2211/3053—In combination with a pressure compensating valve
- F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/355—Pilot pressure control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87169—Supply and exhaust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87169—Supply and exhaust
- Y10T137/87177—With bypass
- Y10T137/87185—Controlled by supply or exhaust valve
Definitions
- the present invention relates to a pressure compensating valve used in a hydraulic circuit for distributing and supplying the discharge oil of one hydraulic pump to a plurality of actuators.
- the discharge conduit 102 of the hydraulic pump 101 is connected to the actuators 106 and 116 via the valve device 150.
- the valve device 150 includes a pressure compensating valve 103, 113, a hold check valve 104a, 114a, a directional control valve 105, 115, and a shuttle valve 1 7 .
- the pressure compensating valves 103, 113 are connected in parallel to the discharge conduit 102, and the outlet conduits 104, 114 of the pressure compensating valves 103, 113 are connected to the hold check valves 104a, 1
- the directional control valves 105 and 115 are connected via 14a, and the outlet sides of the directional control valves 105 and 115 are connected to actuators 106 and 116, respectively.
- the pressure compensating valve 103, 113 is pushed in the opening direction by the discharge pressure of the hydraulic pump 101 and the outlet pressure of the directional control valve 105, 115, and the directional control valve 105, 1 1 It is structured to be pushed in the closing direction by the inlet pressure of 5 and the highest load pressure.
- the shuttle valve 107 selects the higher load pressure by comparing the load pressures of the actuators 106 and 116, and selects the higher one from the pressure compensating valves 103, 113 and the load sensing valve 122. Supply 0.
- the hold check valves 104a and 114a are indispensable for the valve device 150 for driving the actuators 106 and 116. This occurs when the discharge pressure of the hydraulic pump 101 is lower than the load pressure while the directional control valves 105 and 115 are operated, such as when the load on the actuator increases when starting the actuator. This is to prevent the backflow of pressurized oil and maintain the position of the actuator. Therefore, in the valve device 150, a space for providing the hold check valves 104a and 114a in the outlet conduits 104 and 114 of the pressure compensating valves 103 and 113 is required.
- valve device 150 provided with the pressure compensating valves 103 and 113 shown in FIG. 6, the load pressure of the actuator is compared to supply a higher load pressure to the pressure compensating valve.
- a torque valve 107 is required, and the valve device 150 also requires a space for installing the shuttle valve 107 in the signal oil conduit 108, 118.
- valve device 150 including the pressure compensating valves 103, 113, and the directional control valves 105, 115 is enlarged, and the structure of the valve device 150 is complicated. The higher the cost.
- a first object of the present invention is to provide a pressure compensating valve which does not require a hold check valve between the pressure compensating valve and the directional control valve, thereby simplifying the valve device.
- a second object of the present invention is to provide a part for installing a shuttle valve in a load pressure signal line. It is an object of the present invention to provide a pressure compensating valve which can simplify a valve device without providing a pressure compensating valve.
- a third object of the present invention is to provide a pressure compensation valve that prevents abnormal operation of an actuator caused by detection of a load pressure when the magnitude of the load pressure is reversed and transmission of the maximum load pressure, and that does not deteriorate the operation of the actuator. It is to provide.
- the present invention provides a directional control valve, which is disposed on the inlet side of a metering throttle, and determines a differential pressure between an inlet pressure and an outlet pressure of the metering throttle by a hydraulic pump.
- a pressure compensating valve for controlling so as to be equal to the differential pressure between the discharge pressure and the signal pressure of the signal detection path, has a large-diameter portion and small-diameter portions located on both sides of the large-diameter portion.
- a stepped spool formed with a control notch; and a large-diameter portion of the spool interposed therebetween. Discharge pressure of the hydraulic pump is set in an opening direction of the flow control notch.
- a fifth pressure receiving chamber into which pressure is introduced, and a slidably inserted outer periphery of the spool small diameter portion on the same side as the first pressure receiving chamber, and positions respectively in the first pressure receiving chamber and the fifth pressure receiving chamber.
- the discharge pressure of the hydraulic pump can be reduced by the outlet pressure of the metering throttle (when the directional control valve is switched). While the pressure is lower than the load pressure of the actuator, the sleeve does not move and the outlet pressure of the metering throttle is not guided to the third pressure receiving chamber. For this reason, the spool is kept at the position where the control notch of the large diameter portion is closed, and the communication between the first pressure receiving chamber and the second pressure receiving chamber is cut off, and there is no danger of the load pressure flowing back.
- the sleeve moves to guide the outlet pressure of the metering throttle to the third pressure receiving chamber.
- the spool moves in the direction to open the control notch in the large diameter section.
- the first pressure receiving chamber and the second pressure receiving chamber communicate with each other, and the hydraulic oil of the hydraulic pump is supplied to the directional control valve.
- the size of the discharge pressure and the load pressure of the hydraulic pump can be determined by the sleeve, and the spool can be provided with the function of a hold check valve.
- a hold check valve is installed between the pressure compensating valve and the directional control valve. This eliminates the need, and the sleeve can be installed on the outer periphery of the spool without damaging the size of the valve device, so that the valve device can be simplified.
- the present invention provides the pressure compensating valve according to the above (1), wherein the pressure compensating valve is provided in the stepped spool, and an outlet pressure of the metering throttle is measured.
- a signal oil passage provided at an end of a small diameter portion of the spool on the same side as the second pressure receiving chamber, and an outlet pressure of a metering throttle guided to the signal oil passage is a signal pressure of the fourth pressure receiving chamber.
- the present invention provides the pressure compensating valve according to (2), wherein the check valve is provided in a spool small diameter portion on the same side as the second pressure receiving chamber. A slit through which the discharge pressure of the hydraulic pump is guided, and the slit communicates with the fourth pressure receiving chamber when the check valve operates in the opening direction; The signal pressure is generated by reducing the discharge pressure of the hydraulic pump.
- the signal pressure is generated by reducing the discharge pressure of the hydraulic pump, thereby increasing or decreasing the load pressure. This prevents abnormal operation of the actuator, which is caused by detection of the load pressure and transmission of the maximum load pressure when the motor reverses, without deteriorating the operation of the actuator.
- FIG. 1 is a diagram showing a hydraulic drive circuit constituted by a valve device including a pressure compensating valve according to a first embodiment of the present invention.
- Fig. 2 is a diagram for explaining the operation of the pressure compensating valve immediately after switching the directional control valve.
- FIG. 3 is a diagram illustrating the subsequent operation of the pressure relief valve when the directional control valve is switched.
- FIG. 4 is a diagram illustrating the operation of the pressure compensating valve when two directional control valves are simultaneously switched.
- FIG. 5 is a diagram showing a hydraulic drive circuit constituted by a valve device including a pressure compensating valve according to a second embodiment of the present invention.
- FIG. 6 is a diagram showing a hydraulic drive circuit constituted by a conventional valve device including a pressure compensating valve.
- reference numeral 1 denotes a hydraulic pump, and the hydraulic pump 1 has a tilt controller 1-1 for controlling a pump discharge amount.
- the discharge conduit 2 of the hydraulic pump 1 is connected to the actuators 6, 16 via a valve device 50, and the valve device 50 has the pressure compensating valves 3, 13 and the directional control valves 5, 15 of the present invention.
- the pressure compensating valves 3 and 13 are connected in parallel to the discharge conduit 2, and the outlet conduits 4 and 14 of the pressure compensating valves 3 and 13 are connected to the inlet sides of the directional control valves 5 and 15.
- the outlet sides of the control valves 5 and 15 are connected to the actuators 6 and 16, respectively.
- the pressure compensating valves 3 and 13 are of reduced diameter spools 3-1 and 13-1, respectively, and sleeves 3-2 and 13-2 externally mounted on the outer circumference of the spools 3-1 and 13-1. And the check valves 7 and 17 inserted in the spools 3-1, 13_1.
- the pressure compensation valve 3 will be described in detail, but the same applies to the pressure compensation valve 13.
- the diameter reducing spool 3-1 has a large diameter portion 3a having a diameter d1 and small diameter portions 3b and 3c having a diameter d2 located on both sides of the large diameter portion 3a.
- a flow control notch 3 d is formed in a.
- the spool 3-1 is slidably inserted into a part of the casing 10 of the directional control valve 5, and pressure receiving chambers 3f and 3g are provided at positions sandwiching the large diameter portion 3a of the spool 3-1. ing.
- the pressure receiving chamber 3 f is the inlet connected to the discharge conduit 2 of the hydraulic pump 1.
- the discharge port of the hydraulic pump 1 acts on the pressure receiving area on the left side of the large-diameter portion 3a formed by the difference between the large-diameter portion 3a and the small-diameter portion 3b.
- Control Notch Energizes in the 3d opening direction.
- the pressure receiving chamber 3 g communicates with the outlet port connected to the outlet conduit 4, and when the directional control valve 5 is switched, the large diameter portion 3 a formed by the difference between the large diameter portion 3 a and the small diameter portion 3 c
- the inlet pressure of the metering throttles 5a and 5b of the directional control valve 5 is applied to the pressure receiving area on the right side of the drawing to urge the spool 3-1 in the closing direction of the flow control notch 3d.
- the sleeve 3_2 is externally inserted into the small diameter portion 3b of the spool 3-1.
- the check valve 7 is inserted into the small diameter portion 3c of the spool 3-1.
- a pressure receiving chamber 3j is formed between the small-diameter portion 3b and the biston 3i in the sleeve 3-2.
- a signal pressure detection port 3k is formed around the sleeve 3-2 to guide the outlet pressures of the metering throttles 5a and 5b of the directional control valve 5 via the signal detection path 20-1.
- the signal pressure detection port 3k passes through the small hole 3m provided in the sleeve 3-2 and the inner peripheral groove 3n. Communicates with the pressure receiving chamber 3 j.
- the outlet pressure of the metering throttles 5a and 5b is guided to the pressure receiving chamber 3j, and this pressure acts on the end face of the small diameter portion 3b of the spool 3-1.
- a pressure receiving chamber 3p through which the signal pressure of the load pressure signal line 9 is guided is provided in a portion where the end surface of the small diameter portion 3c of the spool 3-1 sleeve 3-2 is located, and an end surface of the small diameter portion 3c is provided. This signal pressure acts.
- a pressure receiving chamber 3 q is formed around the piston 3 i between the cap bolt 3 h and the sleeve 3-2, and the pressure receiving chamber 3 q is a slit 3 provided on the outer periphery of the sleeve 3-2. It communicates with the signal pressure detection port 3k via r, and the outlet pressure of the metering throttles 5a and 5b is led.
- the right end face of the sleeve 3-2 is located in the pressure receiving chamber 3f, the left end face is located in the pressure receiving chamber 3q, and the discharge pressure of the hydraulic pump 1 is acting on the pressure receiving chamber 3f. From the discharge pressure of the hydraulic pump 1 is the pressure of the signal pressure detection port 3 k
- the diameter d1 of the large-diameter portion 3a and the diameter d2 of the small-diameter portion 3b satisfy d1> d2 as already clear.
- the difference between the pressure receiving area of the large diameter part 3a and the pressure receiving area of the small diameter part 3b and the difference of the pressure receiving area of the large diameter part 3a and the small diameter part 3c are as follows. , 3 c equal to the pressure receiving area. If you want to change the performance characteristics, you can make some difference in the area of both, in which case the area will be "almost" equal.
- the check valve 7 is used to generate the pressure of the load pressure signal line 9 from the outlet pressure of the metering throttles 5a and 5b (the load pressure of the actuator 6).
- the pressure receiving chamber 3p is provided at an end portion where the pressure receiving chamber 3p is located, and the pressure of the pressure receiving chamber 3p acts in the closing direction.
- the signal oil passages 3 s 1, 3 s 2 communicate with the signal pressure detection port 3 k through the small holes 3 m and the inner peripheral grooves 3 n provided in the sleeve 3-2 in the spool 3-1. And a pressure receiving chamber 3t are provided.
- the check valve 7 is inserted into a hole forming the pressure receiving chamber 3t, and the check valve 7 is provided with a metering throttle 5a, 5b guided to the pressure receiving chamber 3t.
- the outlet pressure acts in the opening direction, and the check valve 7 operates in the opening direction when the outlet pressure of the metering throttle becomes higher than the signal pressure of the pressure receiving chamber 3p.
- 3 u is a weak holding panel that closes the check valve 7 when not in operation.
- the check valve 7 does not directly output the outlet pressure (load pressure) of the metering throttles 5 a and 5 b guided to the signal oil passages 3 s 1 and 3 s 2 when the valve is opened. Instead, it is configured as a pressure reducing valve that reduces the discharge pressure of the hydraulic pump 1 to create a pressure corresponding to the load pressure.
- the check valve 7 has a valve element 7a, and a valve shaft 7b integrated with the valve element 7a and inserted into the small-diameter portion 3c of the spool 3-1, and an end face of the valve shaft 7b. Faces the pressure receiving chamber 3 t.
- a pump port 7c is formed around the small diameter portion 3c to guide the discharge pressure of the hydraulic pump 1 through an oil passage 2-1 branched from the discharge conduit 2.
- a small diameter portion is provided on the valve shaft 7b.
- a slit 7e is formed to communicate with the pump port 7c through the small hole 7d provided in 3c to guide the discharge pressure of the hydraulic pump 1, and when the check valve 7 moves in the right opening direction in the drawing, The slit 7 e communicates with the pressure receiving chamber 3 p to reduce the discharge pressure of the hydraulic pump 1 to generate a signal pressure.
- the load pressure signal line 9 is newly provided with a throttle 30 on a line 9a connected to the tank T so that the spool 3-1 and the check valve 7 can move.
- the directional control valve 5 is switched to the right as shown in FIG. With this switching operation, the load pressure Pa1 of the actuator 6 is guided to the signal detection path 20-1 and the signal detection port 3k, and this load pressure Pa1 is a signal provided in the spool 3-1.
- the oil is guided to the pressure receiving chamber 3 t through the oil passages 3 s 1 and 3 s 2, and transmitted to the end face of the valve shaft 7 b of the check valve 7 inserted in the spool 3-1.
- the load pressure Pa1 induced in the signal oil passages 3s1, 3s2 and the pressure receiving chamber 3t moves the check valve 7 to the right in the drawing.
- a slit 7 e provided on the outer periphery of the valve shaft 7 b of the check valve 7 opens in the pressure receiving chamber 3 p on the right side of the spool 3 _ 1 in the drawing, and the hydraulic pressure passes through the small hole 7 d and the slit 7 e.
- the discharge pressure Ps of the pump 1 is guided to the pressure receiving chamber 3p, and when this pressure is going to be higher than the load pressure Pa1, the check valve 7 moves to the left in the figure and closes the slit 7e.
- a pressure equivalent to the load pressure Pa1 is generated in the pressure receiving chamber 3p by the discharge pressure Ps of the hydraulic pump 1.
- the pressure in the pressure receiving chamber 3p is transmitted to the displacement controller 11 through the load pressure signal line 9 as the detection signal pressure Pc1. With this signal transmission, the hydraulic pump 1 increases the discharge amount, and the discharge pressure Ps increases.
- the discharge pressure P s is the load pressure P induced to the pressure receiving chamber 3 q When the pressure exceeds a1, the sleeve 3-2 moves to the left in the figure, and the load pressure Pa1 is induced in the pressure receiving chamber 3j, and the state shown in FIG. 3 is obtained.
- the spool 3-1 receives the differential pressure (Ps-Pc1) between the discharge pressure Ps of the hydraulic pump 1 acting on the pressure receiving chambers 3f and 3p and the detection signal pressure Pc1, and the pressure receiving chamber 3
- Ps-Pc1 differential pressure between the discharge pressure Ps of the hydraulic pump 1 acting on the pressure receiving chambers 3f and 3p and the detection signal pressure Pc1
- the pump discharge pressure Ps and the detection signal pressure Pc1 are transmitted to the displacement controller 111 of the hydraulic pump 1, and the hydraulic pump 1 makes the difference between these pressures equal to a predetermined value ⁇ 1.
- the discharge amount is controlled.
- the load pressure Pa1 and the detection signal pressure Pc1 are substantially the same from the balance of the force of the check valve 7. Therefore, the pump discharge pressure Ps and the pressure Pp1 are also substantially the same. That is, the spool 3-1 is fully opened.
- the differential pressure P p1 — Pa 1 across the metering throttle 5 a of the directional control valve 5 becomes equal to the set differential pressure ⁇ P 1 of the tilt controller 11.
- the spool 3-1 was operated in the fully open direction so that the discharge pressure P s of the hydraulic pump and the pressure P p 1 of the outlet conduit 4 were almost equal.
- the discharge pressure P s of the hydraulic pump 1 and the pressure P p 2 of the outlet conduit 14 are different, so that the spool 13 _ 1 has the pump discharge pressure P s between the pressure receiving chamber 3 f and the pressure receiving chamber 3 g. Is reduced to the pressure P p 2 in the outlet conduit 14 at the throttle opening position.
- the above explanation is for the case where the discharge oil amount of the hydraulic pump 1 is insufficient for the required flow rate of the directional control valves 5 and 15.
- both the high-pressure side and low-pressure side directional control valves operate so that the differential pressure across the metering throttles 5a and 15a at 5 and 15 is equal to the reduced differential pressure (Ps-Pc1). Oil does not flow in priority to the low pressure side.
- the first to fifth pressure receiving chambers 3 f, 3 g, 3 j, 3 ⁇ , 3 q are provided in the pressure compensating valves 3 and 13, and the outer circumference of the spool small diameter portion 3 b is provided.
- the discharge pressure of the hydraulic pump 1 is reduced by the metering throttle 5a or 5b, 15a or 1 While it is lower than the outlet pressure of 5 b (load pressure of actuator 6 or 16), sleeve 3-2 or 13-2 does not move, and the outlet pressure of the metering throttle is supplied to the third pressure receiving chamber 3j. I can't.
- the spool 3-1 or 13_1 is kept at the position where the control notch 3d of the large diameter portion 3a is closed, and the communication between the first pressure receiving chamber 3f and the second pressure receiving chamber 3q is cut off. And there is no danger of load pressure backflow.
- the sleeve 3-2 or 13-2 is placed in the third pressure receiving chamber 3j. Move to guide outlet pressure. As a result, the spool 3-1 or 13_1 moves in a direction to open the control notch 3d of the large-diameter portion 3a, and the first pressure receiving chamber 3f and the second pressure receiving chamber 3g communicate with each other. 5 or 15 is supplied with hydraulic oil from hydraulic pump 1.
- the spool 3-1 or 13_1 can be provided with the function of a hold check valve by judging small, so a hold check valve is installed between the pressure compensating valve 3 or 13 and the directional control valve 5 or 15. It is not necessary to perform the operation, and the sleeve 3-2 or 13-2 can be installed on the outer periphery of the spool without impairing the size of the valve device 50, so that the valve device 50 can be simplified.
- valve device 50 can be simplified.
- the signal pressure is generated by reducing the discharge pressure of the hydraulic pump 1. Therefore, abnormal operation of the actuator 6 or 16 due to signal pressure blowout generated by detection of load pressure when the load pressure is reversed and transmission of the maximum load pressure can be prevented, and the operation of the actuator does not deteriorate. .
- FIG. 1 A second embodiment of the present invention will be described with reference to FIG.
- the same components as those shown in FIG. 1 are denoted by the same reference numerals.
- the output pressure (load pressure) of the metering throttle is directly output as the check signal and used as the detection signal pressure.
- the valve device 5 OA is provided with pressure compensating valves 3 A and 13 A according to the present embodiment.
- the pressure compensating valves 3 A and 13 A are check valves 7 A and 17 A, respectively.
- the check valves 7A and 17A respectively have a valve shaft 7Ab inserted integrally with the valve body 7a in the small diameter portion 3c of the spool 3-1 or 13_1.
- the end face of the valve shaft 7Ab faces the pressure receiving chamber 3t.
- a slit 7f is formed on the outer circumference of the valve shaft 7Ab along the entire length in the axial direction.
- the spool 3-1 or 13-1 can be provided with the function of a hold check valve by the movement of the sleeve 3-2 or 13-2, and the pressure compensating valve 3 or 13 and the directional control valve 5 can be provided. It is no longer necessary to install a hold check valve between the pressure compensation valve 3 and the pressure compensation valve 3 A or the 13 A spool 3-1 or 13-1 with a check valve 7 A, Since 17 A is incorporated, there is no need to provide a section for installing a shuttle valve on the load pressure signal line 9, and the valve device 5 OA can be simplified. Industrial applicability
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99900160A EP0967398A4 (en) | 1998-01-12 | 1999-01-11 | PRESSURE SCALES |
US09/367,232 US6135149A (en) | 1998-01-12 | 1999-01-11 | Pressure compensating valves |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10003726A JPH11201107A (ja) | 1998-01-12 | 1998-01-12 | 圧力補償弁 |
JP10/3726 | 1998-01-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999035408A1 true WO1999035408A1 (fr) | 1999-07-15 |
Family
ID=11565295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/000051 WO1999035408A1 (fr) | 1998-01-12 | 1999-01-11 | Soupapes de regulation de pression |
Country Status (6)
Country | Link |
---|---|
US (1) | US6135149A (ja) |
EP (1) | EP0967398A4 (ja) |
JP (1) | JPH11201107A (ja) |
KR (1) | KR100314778B1 (ja) |
CN (1) | CN1255960A (ja) |
WO (1) | WO1999035408A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001330162A (ja) | 2000-05-23 | 2001-11-30 | Hitachi Constr Mach Co Ltd | アンロード弁 |
US20040167854A1 (en) * | 2003-02-21 | 2004-08-26 | Knowles W. Jeffrey | System and method of currency conversion in financial transaction process |
US7921878B2 (en) * | 2006-06-30 | 2011-04-12 | Parker Hannifin Corporation | Control valve with load sense signal conditioning |
KR100780897B1 (ko) * | 2006-09-28 | 2007-11-30 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 중장비용 압력 제어장치 |
CN102465935B (zh) * | 2010-11-11 | 2014-12-10 | 徐州重型机械有限公司 | 压力补偿阀及应用该阀的负载敏感液压系统、起重机 |
CN102032226B (zh) * | 2010-12-29 | 2013-01-23 | 大连华锐重工集团股份有限公司 | 可调叠加式出口压力补偿器 |
CN103047212B (zh) * | 2013-01-08 | 2015-04-01 | 刘安民 | 一种液控换向阀 |
DE102013014671A1 (de) | 2013-09-03 | 2015-03-05 | Hydac Technology Gmbh | Ventilbaukomponenten |
CN104265715B (zh) * | 2014-10-16 | 2017-02-15 | 江苏恒立液压科技有限公司 | 压力补偿阀 |
CN107701534B (zh) * | 2017-08-29 | 2019-12-06 | 潍柴动力股份有限公司 | 负荷传感压力补偿阀 |
CN109707688B (zh) * | 2018-12-29 | 2020-08-18 | 中国煤炭科工集团太原研究院有限公司 | 一种具有前置压力补偿器的流量抗饱负载敏感多路阀 |
EP4019786B1 (en) * | 2020-12-28 | 2023-11-22 | Danfoss Power Solutions (Zhejiang) Co. Ltd | Load-sensing multi-way valve work section |
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JPH04244605A (ja) * | 1991-01-31 | 1992-09-01 | Komatsu Ltd | 圧力補償弁 |
JPH04312202A (ja) * | 1991-02-15 | 1992-11-04 | Marrel | 比例分配装置及びそれを含む油圧制御装置 |
JPH0640409U (ja) * | 1992-10-29 | 1994-05-31 | 株式会社小松製作所 | 圧力補償弁 |
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US2583296A (en) * | 1945-06-18 | 1952-01-22 | Vickers Inc | Flow regulating valve |
ZA7696B (en) * | 1975-02-06 | 1976-12-29 | Commercial Shearing | Compensated work port fluid valves and work port compensators |
DE3321483A1 (de) * | 1983-06-14 | 1984-12-20 | Linde Ag, 6200 Wiesbaden | Hydraulische einrichtung mit einer pumpe und mindestens zwei von dieser beaufschlagten verbrauchern hydraulischer energie |
JPH0737244B2 (ja) * | 1992-07-15 | 1995-04-26 | 株式会社フジシール | 偏平チューブの嵌め込み方法及びその装置 |
-
1998
- 1998-01-12 JP JP10003726A patent/JPH11201107A/ja active Pending
-
1999
- 1999-01-11 WO PCT/JP1999/000051 patent/WO1999035408A1/ja not_active Application Discontinuation
- 1999-01-11 CN CN99800013A patent/CN1255960A/zh active Pending
- 1999-01-11 EP EP99900160A patent/EP0967398A4/en not_active Withdrawn
- 1999-01-11 US US09/367,232 patent/US6135149A/en not_active Expired - Fee Related
- 1999-08-04 KR KR1019997007034A patent/KR100314778B1/ko not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04244605A (ja) * | 1991-01-31 | 1992-09-01 | Komatsu Ltd | 圧力補償弁 |
JPH04312202A (ja) * | 1991-02-15 | 1992-11-04 | Marrel | 比例分配装置及びそれを含む油圧制御装置 |
JPH0640409U (ja) * | 1992-10-29 | 1994-05-31 | 株式会社小松製作所 | 圧力補償弁 |
Also Published As
Publication number | Publication date |
---|---|
CN1255960A (zh) | 2000-06-07 |
KR100314778B1 (ko) | 2001-11-23 |
EP0967398A1 (en) | 1999-12-29 |
EP0967398A4 (en) | 2003-05-07 |
US6135149A (en) | 2000-10-24 |
KR20000070774A (ko) | 2000-11-25 |
JPH11201107A (ja) | 1999-07-27 |
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