WO2017006417A1 - 流体制御装置 - Google Patents
流体制御装置 Download PDFInfo
- Publication number
- WO2017006417A1 WO2017006417A1 PCT/JP2015/069437 JP2015069437W WO2017006417A1 WO 2017006417 A1 WO2017006417 A1 WO 2017006417A1 JP 2015069437 W JP2015069437 W JP 2015069437W WO 2017006417 A1 WO2017006417 A1 WO 2017006417A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- sub
- relief
- valve
- fluid
- Prior art date
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Classifications
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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
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0807—Manifolds
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- 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
- F15B13/024—Pressure relief valves
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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
- 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
- F15B13/027—Check valves
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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
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0832—Modular valves
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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
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0871—Channels for fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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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
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
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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
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
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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
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a 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
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5156—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a return line and a 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
- F15B2211/50—Pressure control
- F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
-
- 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
Definitions
- the present invention relates to a fluid control apparatus that is used in industrial vehicles and industrial machines and includes a plurality of switching valves and a plurality of relief valves.
- fluid control devices including a plurality of switching valves are known in industrial vehicles and the like. This is used by connecting an actuator to each switching valve.
- an actuator connected to the switching valve of such a fluid control device for example, a lift cylinder for raising and lowering a cargo bed in a forklift, a tilt cylinder for tilting a mast supporting the cargo bed forward and backward, etc. It is done.
- the hydraulic fluid pressure required for operating each actuator may be different.
- Different hydraulic fluid pressures are required.
- Patent Document 1 describes an operation from a hydraulic pressure supply source when a switching valve connected to a lift cylinder, which is an actuator that requires the highest hydraulic fluid pressure, takes a position other than an elevated position that guides hydraulic fluid to the lift cylinder. The liquid is led to the sub relief valve.
- the following problems may occur. That is, when the other actuator is operated with the lift cylinder in the raised position, the hydraulic fluid is not guided to the sub relief valve, so hydraulic fluid higher than the second hydraulic pressure is guided to the other actuator.
- other actuators and piping associated with the actuators may be damaged unless a device that can withstand the maximum pressure is selected.
- the other actuators and the pipes withstand high pressures, damage can be prevented, but another problem arises that the cost reduction as described in the previous stage cannot be achieved.
- the present invention pays attention to the above points, and does not lead to an increase in the number of parts and the number of assembly steps, and does not require high hydraulic fluid pressure and prevents high-pressure hydraulic fluid from being led to an actuator having a relatively low pressure resistance. Objective.
- the fluid control device has the following configuration. That is, the fluid control device according to the present invention includes a plurality of switching valves, a high-pressure channel that receives a supply of high-pressure hydraulic fluid from a hydraulic pressure supply source, and passes through the plurality of switching valves in a neutral state.
- a parallel flow channel for branching from the path to guide the hydraulic fluid to each switching valve, a hydraulic fluid that has passed through all the switching valves via the high pressure channel, and a hydraulic fluid discharged from each switching valve A main relief passage that communicates the return passage, a portion between the hydraulic pressure supply source and the switching valve located on the most upstream side, and the return passage, and is provided in the main relief passage, A main relief valve that opens when the hydraulic pressure in the high-pressure channel exceeds a predetermined first hydraulic pressure, and branches from the parallel passage to the switching valve, so that the switching valve is in a predetermined state other than the neutral state.
- Sub-relief communication that communicates with the tank A sub-relief valve provided in the sub-relief passage and opened when a fluid pressure in the parallel flow path exceeds a second fluid pressure lower than the first fluid pressure, and the sub-relief valve in the parallel passage And a check valve that suppresses the flow of hydraulic fluid toward the hydraulic pressure supply source provided between the branch of the relief passage and the switching valve.
- the check valve in the parallel flow path can prevent the hydraulic fluid in a certain actuator from flowing out to other actuators via the parallel path and the sub relief path. Therefore, it is not necessary to separately provide a check valve in the sub relief passage, and the number of parts can be reduced.
- the fluid control device C has a tank 9 for accumulating hydraulic fluid, a hydraulic pump 1 for sending hydraulic fluid from the tank 9, and priority for receiving supply of hydraulic fluid from the hydraulic pump 1.
- a valve mechanism 2 a pump side port 3 a that is stacked on the priority valve mechanism 2, receives supply of hydraulic fluid from the surplus flow output port 2 a of the priority valve mechanism 2, and a tank side port 3 b that discharges hydraulic fluid And a hydraulic unit 3.
- the priority valve mechanism 2 is used for a forklift or the like, and is similar to a well-known type of this priority valve mechanism that supplies hydraulic fluid to a steering mechanism and a hydraulic unit formed by stacking a plurality of switching valves. It has a configuration. That is, various valves such as the priority valve main body 21 are integrally incorporated therein, and has a priority branching function of splitting the supplied hydraulic fluid into a priority flow and an excess flow.
- This priority valve mechanism 2 communicates with an introduction port 2a, which is an inlet for high-pressure hydraulic oil discharged from the hydraulic pump 1, and a steering operation auxiliary circuit ST, and gives priority to the hydraulic fluid required for steering operation.
- the priority valve mechanism 2 includes a return passage 22 through which hydraulic fluid discharged from the steering operation assist circuit ST passes, a main relief passage 23 that short-circuits the introduction port P and the return passage 22, A main relief valve 24 is provided in the main relief passage 23 to prevent the pressure of the working fluid introduced into the introduction port P from exceeding a predetermined first fluid pressure.
- the hydraulic unit 3 is a combination of an unload valve 4, first, second and third fluid control valves 5, 6, 7 and a sub-relief valve portion 8 having a sub-relief valve 81 built-in. It is.
- the hydraulic unit 3 includes a high-pressure channel 31 that receives hydraulic fluid supplied from the pump-side port 3a, and first to third fluid control valves that are branched from the high-pressure channel 31.
- First to third parallel flow paths 32a to 32c for supplying hydraulic fluid to 5 to 7 and the return flow path 22 of the priority valve mechanism 2 are connected to the third fluid control valve via the high pressure flow path 31.
- first to third fluid control valves 5 to 7 all function as switching valves according to the present invention.
- the first parallel flow path 32 a branches from the high pressure flow path 31 and is connected to the first fluid control valve 5.
- a check valve 505 that suppresses the flow of hydraulic fluid from the first fluid control valve 5 toward the pump is provided in the first parallel flow path 32a.
- the second parallel flow path 32 b is branched from the first parallel flow path 32 a and is connected to the second fluid control valve 6. Further, a check valve 605 that suppresses the flow of hydraulic fluid from the second fluid control valve 6 toward the pump is provided in the second parallel flow path 32b.
- the third parallel flow path 32 c is branched from the second parallel flow path 32 b and is connected to the third fluid control valve 7.
- a check valve 705 that suppresses the flow of hydraulic fluid from the third fluid control valve 7 toward the pump is provided in the third parallel flow path 32c.
- the first sub-relief passage 34a branches from the upstream side of the check valve 50 in the first parallel passage 32a, and returns to the return passage 33 through the first fluid control valve 5 and the sub-relief valve 81. To join. However, the upstream side and the downstream side of the first fluid control valve 5 in the first sub-relief passage 34 a are always shut off by the first fluid control valve 5.
- the second sub-relief passage 34b branches from the upstream side of the check valve 60 in the second parallel passage 32b, and joins the first sub-relief passage 34a via the second fluid control valve 6. Then, it passes through the sub-relief valve 81 and merges with the return flow path 33.
- the second sub-relief passage 34c branches from the upstream side of the check valve 70 in the third parallel passage 32c, and joins the second sub-relief passage 34b via the third fluid control valve 7. Then, it passes through the sub-relief valve 81 and merges with the return flow path 33.
- the sub-relief valve 81 is opened when the hydraulic pressure supplied from the parallel flow path 32 to the second and third fluid control valves 6 and 7 exceeds the second hydraulic pressure.
- the second hydraulic pressure is lower than the first hydraulic pressure, which is a threshold hydraulic pressure at which the main relief valve 24 opens.
- the unload valve 4 is connected to a seating sensor (not shown), for example, and the high pressure passage 31 is returned to the return passage 33 only when the seating sensor does not detect that the operator is seated on the driver's seat. Communicate.
- the first fluid control valve 5 includes an inflow port 5a connected to the parallel flow path 32, a discharge port 5b connected to the return flow path 33, and a first and a second connected to a lift cylinder LS as an actuator. Second output ports 5c and 5d are provided.
- the first fluid control valve 5 includes a neutral position for communicating the high-pressure channel 31, a raised position for communicating the inflow port 5a and the first output port 5a, the discharge port 5b, and the It is possible to selectively take three positions: a lowered position for communicating with the second output port 5d and for communicating with the high-pressure channel 31.
- the first fluid control valve 5 is connected to the first operation lever 51, and receives the operation on the first operation lever 51 to switch between the three positions.
- a logic valve 52 is provided between the first output port 5c and the lift cylinder LS.
- An electromagnetic valve 53 is provided in the back pressure chamber of the logic valve 52, and this operation prevents the lift cylinder LS from descending due to the backflow of the working fluid from the lift cylinder LS.
- the lift cylinder LS is connected to the first fluid control valve 5 via the first and second output ports 5c and 5d, and receives the supply of hydraulic fluid to receive the lift cylinder LS.
- the fork (not shown) connected to is raised and the working fluid is discharged to lower the fork (not shown) connected to the lift cylinder LS.
- the first fluid control valve 5 includes a pilot port 5e connected to the upstream side of the first sub-relief passage 34a and a relief port 5f connected to the downstream side of the first sub-relief passage 34a. However, the pilot port 5e and the relief port 5f are always blocked.
- the second fluid control valve 6 is connected to the inflow port 6a connected to the parallel flow path 32, the discharge port 6b connected to the return flow path 33, and the cylinder chamber TS1 side of the tilt cylinder TS as an actuator.
- the first output port 6c, the second output port 6d connected to the piston TS2 side of the tilt cylinder TS, the pilot port 6e connected to the upstream side of the second sub-relief passage 34b, and the second sub-port It has a relief port 6f connected to the downstream side of the relief passage 34b.
- the second fluid control valve 6 includes a neutral position for communicating the high-pressure flow path 31, the inflow port 6a and the first output port 6c, and the discharge port 6b and the second output port.
- 3 positions of an inclined position for communicating 6d, an upright position for communicating the inflow port 6a and the second output port 6d, and a discharge position 6b and the first output port 6c are selectively used. Can be taken.
- the pilot port 6e and the relief port 6f are blocked.
- the pilot port 6e and the relief port 6f communicate with each other, and a part of the high-pressure hydraulic fluid from the second parallel flow path 32b is in the second sub-relief passage. 34b.
- the second fluid control valve 6 is connected to a second operation lever 61, and is switched between the three positions in response to an operation on the second operation lever 61.
- the second fluid control valve 6 includes a mast (not shown) that supports the fork to prevent the mast from tilting forward due to the backflow of hydraulic fluid when the mast (not shown) is stopped in a tilted posture.
- a tilt lock valve 6Z is provided.
- the tilt cylinder TS includes a cylinder chamber TS1 and a piston TS2. As described above, the cylinder chamber TS1 has the first output port 6c of the second fluid control valve, and the piston TS2 side has the second output port 6c.
- the fluid control valve communicates with the second output port 6d.
- the hydraulic fluid is supplied to the cylinder chamber TS1, and a mast (not shown) that is connected to the tilt cylinder TS and supports the fork (not shown) is tilted forward.
- the mast (not shown) is returned from the tilted state to the standing state.
- the third fluid control valve 7 includes an inflow port 7a connected to the parallel flow path 32, a discharge port 7b connected to the return flow path 33, and a first fluid introduction port R1a of the rotation mechanism R that is an actuator.
- a first output port 7c connected to the second fluid inlet port R1b of the rotation mechanism R, a second output port 7d connected to the second fluid inlet port R1b, and the third sub-port branched from the parallel flow path 32.
- a pilot port 7e connected to the upstream side of the relief passage 34c and a relief port 7f connected to the downstream side of the third sub-relief passage 34c are provided.
- the third fluid control valve 7 includes a neutral position for communicating the high-pressure flow path 31, the inflow port 7a and the first output port 7c, and the discharge port 7b and the second output port.
- the three positions of the forward rotation position for communicating 7d, the inflow port 7a and the second output port 7d, and the reverse rotation position for communicating the discharge port 7b and the first output port 7c. Can be taken selectively.
- the neutral position the pilot port 7e and the relief port 7f are blocked.
- the pilot port 7e and the relief port 7f communicate with each other, and a part of the high-pressure hydraulic fluid from the third parallel flow path 32c is transferred to the third sub flow path 32c. It is guided to the relief passage 34c.
- the third fluid control valve 7 is connected to a third operating lever 71 and receives an operation on the third operating lever 71 to switch between the three positions.
- the rotating mechanism R is configured using a hydraulic motor R1 having first and second fluid inlets R1a and R1b, and a rotating attachment such as a rotating fork connected to the hydraulic motor R1 via an output shaft. (Not shown) is driven. Specifically, the hydraulic fluid is supplied from the first fluid introduction port R1a, the rotary attachment is rotated in the forward direction, the hydraulic fluid is discharged from R2b of the second fluid introduction port, and the second fluid introduction port The hydraulic fluid is supplied from R1b, the rotary attachment is rotated in the forward direction, and the hydraulic fluid is discharged from R1a of the first fluid introduction port. That is, the rotary attachment such as a rotary fork driven by the rotary mechanism R can rotate in both forward and reverse directions.
- both the second and third fluid control valves 6 and 7 have the following configuration.
- the configuration of the second fluid control valve 6 will be described as a representative.
- the second fluid control valve 6 includes a body 600 and a spool valve body 604 that can slide in a spool hole 602 provided in the body 600.
- a hydraulic fluid supply path 601 that constitutes the second parallel flow path 32b
- a center passage 603 that constitutes the high pressure flow path 31, and the check valve 605 provided in the hydraulic fluid supply path 601.
- the first output port 6c, the second output port 6d, the discharge port 6b, the pilot port 6e, and the relief port 6f are formed.
- the downstream side of the check valve 605 in the hydraulic fluid supply path 601 is formed as an arch portion 606 having a function as the inflow port 6a.
- the spool valve body 604 communicates with the arch portion 606 and the first output port 6c in an inclined position, and communicates with the arch portion 606 and the discharge port 6b in an upright position.
- a second communication groove 604b that communicates the arch portion 606 and the discharge port 6b in the inclined position and communicates the arch portion 606 and the second output port 6d in the standing position, and the pilot port 6e in the inclined position.
- a third communication groove 604c that communicates with the relief port 6f and a fourth communication groove 604d that communicates the pilot port 6e and the relief port 6f at the upright position are provided.
- the body 600 includes a first land 600a between the arch portion 606 and the first output port 6c, and a second land 600b between the arch portion 606 and the second output port 6d.
- a fifth land 600e is provided between each of them and 6f.
- These first to fifth lands 600a to 600e have a function of blocking the ports through portions other than the communication grooves 604a to 604d of the spool valve body 604.
- the spool valve body 604 includes members such as a pilot spool that constitutes the tilt lock valve 6Z and a spring that biases the pilot spool toward the valve closing position. Yes.
- the configuration and operation of the tilt lock valve 6Z have the same configuration as a well-known tilt lock valve used in this type of fluid control valve, and thus detailed description thereof is omitted.
- the arch portion 606 and the first output port 6c, and the arch portion 606 and the first output port 6c are arranged.
- the two output ports 6d are both blocked.
- the hydraulic fluid supply path 601 and the pilot port 6e and the relief port 6f are blocked.
- the second output port 6d and the discharge are provided between the arch portion 606 and the first output port 6c.
- the port 6b communicates with each other.
- the hydraulic fluid supply path 601 and the pilot port 6e communicate with the relief port 6f.
- part of the hydraulic fluid supplied from the pump to the second parallel flow path 32b is guided to the first output port 6c, and the other part of the hydraulic fluid passes through the relief port 6f and is sub-relief. Guided to valve 81.
- the third fluid control valve 7 has substantially the same configuration as the second fluid control valve 6.
- each part in the third fluid control valve 7 is given the same name as the corresponding part in the second fluid control valve 6 and a reference numeral in which the leading 6 is changed to 7.
- the third fluid control valve 7 includes a body 700 having the same configuration as the body 600 of the second fluid control valve 6, and a spool hole provided in the body 700.
- a spool valve body 704 slidable in the interior 702.
- the spool valve body 704 also has the same configuration as the spool valve body 604 of the second fluid control valve 6 except that it does not include a member constituting a tilt lock valve.
- the first fluid control valve 5 includes a body 500 having the same configuration as the body 600 of the second fluid control valve 6 and a spool hole 502 provided in the body 500. And a slidable spool valve body 504.
- the spool valve body 504 is not provided with a member constituting the tilt lock valve, and is not provided with the third and fourth communication grooves, and the spool valve body of the second fluid control valve 6 is provided. It has the same configuration as 604. Since the spool valve body 504 is not provided with the third and fourth communication grooves, the pilot port 5e and the relief port 5f are always blocked as described above.
- the second sub-relief passage 34b communicates with the second parallel flow path 32b
- the third The sub-relief passage 34c communicates with the third parallel flow path 32c.
- the second sub-relief passage 34b is branched upstream of the check valve 605 in the second parallel flow path 32b.
- the third sub-relief passage 34c is branched upstream of the check valve 705 in the third parallel flow path 32c.
- the second sub-relief passage 34b is branched from the upstream side of the check valve 605 in the second parallel passage 32b, and the third sub-relief passage 34b is branched. Since the relief passage 34c is branched from the upstream side of the check valve 705 in the third parallel passage 32c, the relief passage 34c reaches the tilt cylinder TS or the rotation mechanism R from the sub relief passages 34b, 34c and the switching valves 6, 7. The passage does not communicate within the switching valves 6 and 7. Due to this and the presence of the check valves 605 and 705, when the tilt cylinder TS and the rotation mechanism R operate simultaneously, the working fluid in the tilt cylinder TS is second and third sub-relief passages 34b.
- the hydraulic fluid from the parallel flow path is guided to the sub-relief passage at any position other than the neutral position in any of the second and third switching valves.
- the type of actuator connected to the switching valve and the type of operation performed by the actuator it may be necessary to introduce high-pressure hydraulic fluid.
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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)
- Forklifts And Lifting Vehicles (AREA)
Abstract
Description
23…メインリリーフ流路
24…メインリリーフ弁
31…高圧流路
32a…(第1の)パラレル流路
32b…(第2の)パラレル流路
32c…(第3の)パラレル流路
33…戻り流路
34a…(第1の)サブリリーフ流路
34b…(第2の)サブリリーフ流路
34c…(第3の)サブリリーフ流路
5…切換弁(第1の流体制御弁)
6…切換弁(第2の流体制御弁)
7…切換弁(第3の流体制御弁)
505、605、705…逆止弁
81…サブリリーフ弁
Claims (1)
- 複数の切替弁と、
液圧供給源から高圧の作動液の供給を受け、中立状態にある前記複数の切替弁を貫通する高圧流路と、
この高圧流路から分岐させてなり前記各切替弁に作動液を導くためのパラレル流路と、
前記高圧流路を経て全ての切替弁を通過した作動液及び各切替弁から吐出された作動液を受けタンクに導く戻り流路と、
前記液圧供給源と最も上流側に位置する切換弁との間の部位と前記戻り流路とを連通するメインリリーフ通路と、
前記メインリリーフ通路中に設けられ、前記高圧流路の液圧が所定の第1の液圧を上回るときに開弁するメインリリーフ弁と、
前記パラレル通路から分岐して前記切換弁に達し、切換弁が中立状態以外の所定の状態にあるときにタンクに連通するサブリリーフ通路と、
前記サブリリーフ通路中に設けられ、前記パラレル流路の液圧が前記第1の液圧より低い第2の液圧を上回るときに開弁するサブリリーフ弁と、
前記パラレル通路における前記サブリリーフ通路との分岐と前記切換弁との間に設けた液圧供給源に向かう作動液の流れを抑制する逆止弁と
を具備することを特徴とする流体制御装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017526822A JP6477881B2 (ja) | 2015-07-06 | 2015-07-06 | 流体制御装置 |
CN201580081465.7A CN108368863A (zh) | 2015-07-06 | 2015-07-06 | 流体控制装置 |
EP15897680.3A EP3321514A4 (en) | 2015-07-06 | 2015-07-06 | FLUID CONTROL DEVICE |
US15/741,868 US10557484B2 (en) | 2015-07-06 | 2015-07-06 | Fluid control device |
PCT/JP2015/069437 WO2017006417A1 (ja) | 2015-07-06 | 2015-07-06 | 流体制御装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2015/069437 WO2017006417A1 (ja) | 2015-07-06 | 2015-07-06 | 流体制御装置 |
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WO2017006417A1 true WO2017006417A1 (ja) | 2017-01-12 |
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PCT/JP2015/069437 WO2017006417A1 (ja) | 2015-07-06 | 2015-07-06 | 流体制御装置 |
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US (1) | US10557484B2 (ja) |
EP (1) | EP3321514A4 (ja) |
JP (1) | JP6477881B2 (ja) |
CN (1) | CN108368863A (ja) |
WO (1) | WO2017006417A1 (ja) |
Cited By (1)
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JP7001481B2 (ja) * | 2018-01-12 | 2022-01-19 | Kyb株式会社 | 制御弁 |
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- 2015-07-06 US US15/741,868 patent/US10557484B2/en not_active Expired - Fee Related
- 2015-07-06 WO PCT/JP2015/069437 patent/WO2017006417A1/ja active Application Filing
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WO2020100236A1 (ja) | 2018-11-14 | 2020-05-22 | 株式会社島津製作所 | 流体制御装置 |
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Also Published As
Publication number | Publication date |
---|---|
EP3321514A1 (en) | 2018-05-16 |
US20180202472A1 (en) | 2018-07-19 |
CN108368863A (zh) | 2018-08-03 |
EP3321514A4 (en) | 2019-03-27 |
JP6477881B2 (ja) | 2019-03-06 |
US10557484B2 (en) | 2020-02-11 |
JPWO2017006417A1 (ja) | 2018-03-01 |
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