Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/20—Drives; Control devices
  • E02F9/22—Hydraulic or pneumatic drives
  • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/08—Superstructures; Supports for superstructures
  • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
  • E02F9/12—Slewing or traversing gears
  • E02F9/121—Turntables, i.e. structure rotatable about 360°
  • E02F9/123—Drives or control devices specially adapted therefor
• • 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
  • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
  • F15B1/02—Installations or systems with accumulators
  • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
• • 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
  • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
  • F15B1/02—Installations or systems with accumulators
  • F15B1/027—Installations or systems with accumulators having accumulator charging devices
  • F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
• • 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
  • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
  • F15B21/14—Energy-recuperation means
• • 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
• • 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
  • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
  • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
• • 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
• • 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
  • F15B2211/31—Directional control characterised by the positions of the valve element
  • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
  • F15B2211/32—Directional control characterised by the type of actuation
  • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
• • 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
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/63—Electronic controllers
  • F15B2211/6303—Electronic controllers using input signals
  • F15B2211/6306—Electronic controllers using input signals representing a pressure
• • 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
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/63—Electronic controllers
  • F15B2211/6303—Electronic controllers using input signals
  • F15B2211/6306—Electronic controllers using input signals representing a pressure
  • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
• • 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
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/63—Electronic controllers
  • F15B2211/6303—Electronic controllers using input signals
  • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
• • 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
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/665—Methods of control using electronic components
• • 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
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/665—Methods of control using electronic components
  • F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
• • 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
  • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
  • F15B2211/7058—Rotary output members
• • 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
  • F15B2211/80—Other types of control related to particular problems or conditions
  • F15B2211/85—Control during special operating conditions
  • F15B2211/853—Control during special operating conditions during stopping
• • 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
  • F15B2211/80—Other types of control related to particular problems or conditions
  • F15B2211/88—Control measures for saving energy

Definitions

• the present invention relates to a fluid pressure circuit, for example, a fluid pressure circuit that controls a fluid actuator in response to an operation command.
• a fluid pressure circuit as described in Patent Citation 1 swings an upper structure using a swing motor that is a hydraulic motor, and is mainly composed of a pump, the swing motor, a control valve, a regulating valve, and an accumulator.
• the swing motor is rotated by oil fed from the pump.
• the control valve is provided between the pump and the swing motor. The control valve can switch the direction in which the oil fed from the pump passes through the swing motor. Depending on the flow direction, the rotation direction of the swing motor is switched.
• the opening degree of the regulating valve is regulated according to the pressure of the accumulator. Accordingly, the hydraulic circuit can store an appropriate amount of the oil in the accumulator. Meanwhile, when the rotation of the swing motor is stopped and the regulating valve receives a very high pressure, the opening degree of the regulating valve widens instantaneously, and the deviation from a target flow rate is increased, so that the fluid pressure for stopping the rotation of the swing motor is lost, which is a risk.
• the present invention has been made in view of such problems, and an object of the present invention is to provide a fluid pressure circuit capable of supplying a fluid to a regenerative system with good responsiveness.
• a fluid pressure circuit is a fluid pressure circuit including: a pressure supply source; an actuator device actuated by a fluid from the pressure supply source; a direction switching valve provided in a main flow passage between the pressure supply source and the actuator device; a regenerative system connected to the main flow passage via a branch flow passage; and a control valve that controls a flow rate from the main flow passage to the branch flow passage, wherein a throttle that throttles the fluid from the main flow passage is disposed in the branch flow passage, and the control valve receives a main fluid pressure of the main flow passage and a branch fluid pressure of the branch flow passage obtained by the throttle, and is controlled by a differential pressure between the main fluid pressure and the branch fluid pressure.
• control valve is controlled using the differential pressure between the pressure of the main flow passage and the pressure of the branch flow passage.
• the throttle is a variable throttle that is controlled based on information obtained from the regenerative system.
• the fluid pressure circuit can supply an appropriate amount of the fluid to the regenerative system.
• the information obtained from the regenerative system is an electric signal obtained from a sensor disposed on a regenerative system side. According to this preferable configuration, since the opening degree of the variable throttle is controlled in response to the electric signal from the sensor on the regenerative system side, the configuration is simple.
• the throttle is provided in an actuation position of a 3-port, 2-position electromagnetic valve.
• the fluid pressure circuit can supply the fluid to the regenerative system with good responsiveness during regeneration while causing the actuator device to actuate smoothly.
• a mode for implementing a fluid pressure circuit according to the present invention will be described below based on an embodiment.
• FIGS. 1 to 11 A fluid pressure circuit according to an embodiment of the present invention will be described with reference to FIGS. 1 to 11 .
• a hydraulic circuit serving as the fluid pressure circuit according to the embodiment is a hydraulic circuit that controls rotation of a hydraulic motor in response to an operation command in a work machine, a construction machine, a cargo handling vehicle, an automobile, and the like, and is incorporated into, for example, a swing device 101 of a hydraulic excavator 100 illustrated in FIG. 1 .
• an undercarriage 102 and a swing body 103 are connected to each other via the swing device 101.
• the swing body 103 is swingable in response to the rotation of a hydraulic motor 4 (refer to FIG. 2 ) of the swing device 101.
• the hydraulic motor 4 is driven by a hydraulic circuit 110 (refer to FIG. 2 ).
• the hydraulic circuit 110 will be described.
• the hydraulic circuit 110 is composed of the hydraulic pump 2 serving as a fluid supply source driven by a drive mechanism 1 such as an engine or an electric motor; a direction switching valve 3; the hydraulic motor 4; a remote control 5; flow diverter valves 6 and 7; an electromagnetic proportional valve 8; relief valves 9 and 10; pressure sensors 11 to 13; an accumulator 14 serving as an auxiliary device; a controller 15; a tank 16; check valves 17 to 20; shuttle valves 21 and 22; oil passages 23 to 45; and electric signal line 46 to 52.
• the accumulator 14 is provided as an example of an auxiliary device, but is not limited thereto.
• the hydraulic pump 2 is coupled to the drive mechanism 1 such as an internal combustion engine, and is rotated by power from the drive mechanism 1 to supply pressure oil to a downstream side through the oil passage 23.
• the pressure oil discharged from the hydraulic pump 2 flows into the direction switching valve 3 through the oil passage 24.
• the direction switching valve 3 is a 6-port, 3-position, closed-center electromagnetic direction switching valve, and all ports are closed in a state where a spool is in a neutral position.
• the remote control 5 is an electric joystick.
• the remote control 5 When the operation lever 5-1 is operated in a right direction A or a left direction B, the remote control 5 outputs an electric signal proportional to an operation amount of the operation lever 5-1.
• the electric signal is input to the controller 15 through the electric signal line 46.
• An arithmetic circuit of the controller 15 outputs an electric signal, which corresponds to the electric signal input from the remote control 5, to the electric signal line 47 or the electric signal line 48.
• the electric signal output from the controller 15 to the electric signal line 47 or the electric signal line 48 is proportional to the operation amount of the operation lever 5-1.
• the electric signal output from the controller 15 is applied to a solenoid 3-1 of the direction switching valve 3 through the electric signal line 47. Accordingly, the spool of the direction switching valve 3 moves, and the direction switching valve 3 is switched to a first swing position 3-3.
• the pressure oil fed from the hydraulic pump 2 flows into the hydraulic motor 4 through the direction switching valve 3 and the oil passages 25 and 26, and when the pressure oil passes through the hydraulic motor 4, the pressure oil is discharged to the tank 16 through the oil passages 27 and 28, the direction switching valve 3, and the oil passage 29. At this time, the hydraulic motor 4 is rotated in a clockwise direction.
• the electromagnetic proportional valve 8 is configured such that the opening area variably changes substantially in proportion to the electric signal input from the controller 15 through the electric signal line 51.
• the controller 15 when the controller 15 outputs an electric signal to the electromagnetic proportional valve 8, the controller 15 also outputs an electric signal to the hydraulic pump 2 to reduce the amount of the pressure oil fed from the hydraulic pump 2. Accordingly, the energy required to drive the hydraulic pump 2 can be reduced.
• the flow rate Q1 is the total flow rate of the pressure oil discharged from the hydraulic motor 4 by the pumping action due to the inertial force acting on the swing body 103 when the operation lever 5-1 is returned to the neutral position at once from a state where the operation lever 5-1 is operated to the maximum amount.
• the set pressure Pst is a pressure required to stop the swing body 103 within a predetermined angle around the shaft of the hydraulic motor 4 when the swing body 103 is brought to a stop. Accordingly, after the operation lever 5-1 is operated to the neutral position, a risk of the swing body 103 swinging excessively or a risk of damage to the hydraulic circuit due to an excessive increase in pressure, namely, an accident caused by a so-called excessive swing flow is prevented.
• the oil passage 60-4 is connected to the oil passage 62 and the oil passage 63.
• the oil passage 60-5 is branched and connected to the oil passage 60-4.
• the oil passage 60-7 is connected to the oil passage 60-5 via the variable throttle 60-6.
• the oil passage 60-7 is connected to the oil passage 64. Accordingly, in the actuation position 60-2, the oil passage 62 and the oil passage 63 are in communication with each other, and the oil passage 64 is also in communication therewith.
• the flow control valve 60 variably changes a priority flow rate substantially in proportion to the electric signal from the controller 15.
• the priority flow rate is the amount of the pressure oil supplied to the oil passage 64 through the variable throttle 60-6.
• the opening area of the variable throttle 60-6 variably changes substantially in proportion to the electric signal from the controller 15.
• the spring 61-3 is disposed on the paper upper side of the spool (not illustrated), and biases the spool toward the paper lower side.
• the excess oil amount ⁇ Q and the set pressure Pst are set in advance by the override characteristic of each of the relief valves 9 and 10.
• the controller 15 of the present embodiment can output an electric signal for controlling the opening degree to an appropriate opening degree Ax using only the pressure value Px of the accumulator 14.
• the controller 15 reduces the output electric signal as the pressure value Px of the accumulator 14 decreases, and increases the output electric signal as the pressure value Px of the accumulator 14 increases.
• the spool moves to the paper lower side to the extent that the fluid pressure P2 increases, so that the opening degree between the oil passages 63 and 65 is widened and the opening degree between the oil passages 64 and 66 are narrowed. Therefore, the fluid pressure P2 increases instantaneously, the differential pressure ⁇ P between the fluid pressure P1 and the fluid pressure P2 decreases, so that the inflow of the pressure oil from the side of the oil passages 25 and 26 to the oil passage 64 can be reduced.
• the fluid pressure P2 decreases or the fluid pressure P1 increases, so that the differential pressure ⁇ P corresponding to the opening degree Ax of the variable throttle 60-6 can be regulated to a constant differential pressure ⁇ P10 or differential pressure ⁇ P20 regardless of whether the differential pressure ⁇ P is the differential pressure ⁇ P10 or the differential pressure ⁇ P20.
• the hydraulic circuit 110 can prevent the pressure oil from passing between the oil passages 64 and 66 in an amount more than or equal to the excess oil amount ⁇ Q, and maintain the amount of oil in the oil passages 25 and 26 required to obtain the set pressure Pst.
• the spool moves to the paper upper side to the extent that the fluid pressure P2 decreases, so that the opening degree between the oil passages 63 and 65 is narrowed and the opening degree between the oil passages 64 and 66 are widened. Therefore, since the fluid pressure P2 decreases instantaneously, and the differential pressure ⁇ P between the fluid pressure P1 and the fluid pressure P2 increases, the inflow of the pressure oil from the side of the oil passages 25 and 26 to the oil passage 64 can be increased.
• the fluid pressure P1 decreases or the fluid pressure P2 increases, so that the differential pressure ⁇ P corresponding to the opening degree Ax of the variable throttle 60-6 can be regulated to a constant differential pressure ⁇ P10 or differential pressure ⁇ P20 regardless of whether the differential pressure ⁇ P is the differential pressure ⁇ P10 or the differential pressure ⁇ P20.
• the hydraulic circuit 110 can suppress the discharge of the pressure oil from the relief valve 10 to the oil passage 27 side more than necessary, and the excess oil amount ⁇ Q is allowed to pass between the oil passages 64 and 66.
• the flow diverter valve 7 includes a flow control valve 70 and a pressure compensation valve 71 serving as a control valve, and the flow control valve 70 is connected to the controller 15 through the electric signal line 50. Since the other configurations have the same as the configurations of the flow diverter valve 6, duplicate descriptions will be omitted.
• the pressure compensation valve 61 is controlled using the differential pressure ⁇ P between the fluid pressure P1 of the oil passages 25 and 26 and the fluid pressure P2 of the oil passage 64.
• the hydraulic circuit 110 can supply the pressure oil to the regenerative system R with good responsiveness.
• the hydraulic circuit 110 uses the variable throttle 60-6 to control the amount of oil from the oil passages 25 and 26 to the oil passage 64. Therefore, the hydraulic circuit 110 can supply an appropriate amount of the pressure oil to the regenerative system R while maintaining the amount of oil in the oil passages 25 and 26 required to obtain the set pressure Pst.
• the hydraulic circuit 110 has a simple configuration since an electric signal corresponding to the pressure value Px on the accumulator 14 side is input to the controller 15 from the pressure sensor 13 and the opening degree Ax of the variable throttle 60-6 is controlled accordingly.
• the fluid pressure circuit is a hydraulic circuit in which oil is pumped
• the present invention is not limited thereto.
• a fluid other than oil may be used, and the fluid to be applied may be changed as appropriate.
• the actuator has been described as being a hydraulic motor, but is not limited thereto, and the actuator may be a hydraulic cylinder and may be changed as appropriate.
• the present invention is not limited thereto.
• a generator may be applied, and the configuration may be changed as appropriate as long as energy can be regenerated by the flow of a fluid.
• the configuration in which the control valve is a pressure compensation valve has been described; however, the present invention is not limited thereto, and the configuration may be changed as appropriate as long as the valve is operated by a pilot differential pressure.
• the configuration may be such that the control valve can regulate the opening degree on a branch flow passage side whereas the control valve is not involved in regulating the opening degree on a main flow passage side, and in such a configuration, the opening degree on the main flow passage side may be kept at a constant opening degree that allows the fluid to flow.
• the throttle is a variable throttle
• the present invention is not limited thereto, and the throttle may be a fixed throttle.
• the remote control is an electric joystick
• the present invention is not limited thereto, and the remote control may be, for example, a remote control valve that variably controls the pilot pressure acting on the direction switching valve.
• fluid pressure may be used as appropriate instead of an electric signal.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Fluid-Pressure Circuits (AREA)
• Operation Control Of Excavators (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=91195569

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Citations (1)

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• 2023
  • 2023-11-02 CN CN202380062695.3A patent/CN119836528A/zh active Pending
  • 2023-11-02 EP EP23894393.0A patent/EP4624765A1/fr active Pending
  • 2023-11-02 JP JP2024560043A patent/JPWO2024111381A1/ja active Pending
  • 2023-11-02 WO PCT/JP2023/039702 patent/WO2024111381A1/fr not_active Ceased

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