EP4547912A1 - Hydraulischer antrieb und verfahren zum regenerativen absenken eines elements einer arbeitsmaschine - Google Patents
Hydraulischer antrieb und verfahren zum regenerativen absenken eines elements einer arbeitsmaschineInfo
- Publication number
- EP4547912A1 EP4547912A1 EP23735286.9A EP23735286A EP4547912A1 EP 4547912 A1 EP4547912 A1 EP 4547912A1 EP 23735286 A EP23735286 A EP 23735286A EP 4547912 A1 EP4547912 A1 EP 4547912A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydraulic
- valve
- connection
- chamber
- consumer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- 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
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- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
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- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
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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
- 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
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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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
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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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
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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
- F15B2211/20—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
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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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20569—Type of pump capable of working as pump and motor
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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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
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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
- F15B2211/30525—Directional control valves, e.g. 4/3-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
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
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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
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
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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
- F15B2211/31—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
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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
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
- F15B2211/31529—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having a single pressure source and a single output member
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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
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
- F15B2211/31547—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having multiple pressure sources and multiple output members
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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
- F15B2211/40—Flow control
- F15B2211/41—Flow control characterised by the positions of the valve element
- F15B2211/411—Flow control characterised by the positions of the valve element the positions being discrete
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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
- F15B2211/40—Flow control
- F15B2211/41—Flow control characterised by the positions of the valve element
- F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41509—Flow control characterised by the connections of the flow 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
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41563—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a return line
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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
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
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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
- F15B2211/70—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
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
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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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
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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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/76—Control of force or torque of the output member
- F15B2211/761—Control of a negative load, i.e. of a load generating hydraulic energy
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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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Definitions
- the present invention relates to a hydraulic drive and a method for regenerative lowering of an element of a work machine.
- Mobile work machines such as excavators, telehandlers, reach stackers, and others, have booms with which heavy loads can be lifted and then lowered again after the load has been transported or moved.
- the lowering process can take place very quickly and can be positioned less precisely, or it can be carried out more slowly and can be positioned more precisely.
- a load is lowered dissipatively by setting a volume flow via an adjustable aperture, through which the speed can be controlled very well.
- the proposed drive and control arrangements can expand existing systems in such a way that a regenerative lowering of an active load is possible and the Potential energy can be recovered in significant parts.
- the arrangement can ensure that additional consumers can continue to be controlled.
- the solution presented can in particular be designed to be modular as a possible platform and transferable to various applications.
- a return line is provided in a hydraulic drive between a linear consumer, for example a lifting cylinder, and the hydraulic machine in order to return hydraulic fluid (hydraulic fluid, for example hydraulic oil) to drive the hydraulic machine, and at the same time a switching valve between the hydraulic machine and the valve block (directional valve arrangement). to block the connection of the hydraulic machine to the valve block.
- the hydraulic drive is provided for or in a work machine which has a hydraulic linear consumer and at least one further hydraulic consumer, the linear consumer having a first chamber and being arranged in such a way that a volume flow of pressurized hydraulic fluid into the first chamber causes a movement of a Elements (lifting or lowering, depending on whether the hydraulic fluid flows into or out of the first chamber) of the work machine (e.g. excavator).
- the element is, for example, a boom, a lifting platform or similar of the work machine.
- the linear consumer in particular has one or more hydraulic cylinders (hydraulic cylinders). In principle, it can be provided that the linear consumer has several hydraulic cylinders and thus several chambers, the pressurization of which causes the same movement (e.g.
- the hydraulic drive has an adjustable hydraulic machine, which can be pivoted to zero (ie a pivot angle of the hydraulic machine can assume both positive and negative values), and a hydraulic pump, the drives of which are mechanically coupled (mechanical energy or power can therefore be transferred between the hydraulic machine and the hydraulic pump).
- the mechanical coupling takes place in particular via a shaft and/or a gear.
- a hydraulic machine is a hydraulic machine that can act as both a hydraulic pump and a hydraulic motor, depending on the set (positive/negative) swivel angle.
- the hydraulic pump can only act as a hydraulic pump, so if it is an adjustable pump it cannot be pivoted to zero.
- a valve block which can also be referred to as a main valve, which has a first hydraulic valve input connection, a second hydraulic valve input connection, a first hydraulic consumer connection (or output connection) which is hydraulically connected to the first chamber of the linear consumer can be connected or connected, and has at least one further hydraulic consumer connection (or output connection), which can be hydraulically connected or connected to the at least one further consumer.
- the first hydraulic valve input port is hydraulically connected to the first hydraulic consumer port in a controllable manner and the second hydraulic valve input port is hydraulically connected to the at least one further hydraulic consumer port in a controllable manner.
- controllable refers to the fact that the valve block can be controlled so that the hydraulic connection is adjustable between a closed and an open state.
- the valve block can, for example, be a single structural unit, e.g. be viewed as a single (main) valve, or be constructed modularly from several components, e.g. individual (sub) valves.
- the valve block preferably comprises or is a directional control valve arrangement which has the first and a second hydraulic valve inlet connection and which has a first directional control valve on which the first hydraulic consumer connection (or output connection) is provided, and at least one second directional control valve, on which at least one further hydraulic consumer connection is provided.
- the first directional control valve is hydraulically connected to the first valve input port and at least a second one Directional valve is hydraulically connected to the second valve input port.
- the directional valves of the directional valve arrangement can therefore be supplied with hydraulic fluid independently of one another (ie 2-circuit hydrosystem) via the valve input connections, which can be passed on to various consumers through the directional valves.
- the directional valve arrangement is an example of a modular design of the valve block.
- the first consumer connection in particular the first directional control valve
- the second valve input connection can be hydraulically connected to the second valve input connection.
- a switching valve e.g. a switching valve or proportional valve
- a summing valve can be provided in the valve block, in particular in the directional control valve arrangement.
- the second valve input connection is then hydraulically connected to the first consumer connection, in particular the first directional control valve, via the connection or summing valve. It is also conceivable that this functionality may be integrated into the first directional control valve.
- the first directional control valve is then hydraulically connected directly to the second valve input connection. Such configurations can be useful in order to be able to temporarily make the combined hydraulic power of the hydraulic machine and the hydraulic pump available to the linear consumer.
- the at least one further consumer connection in particular the at least one second directional control valve
- a switching valve e.g. a switching valve or proportional valve
- a summing valve can be provided in the valve block, in particular in the directional control valve arrangement, or this functionality can optionally be integrated into the at least one second directional control valve.
- the hydraulic fluid is supplied by the hydraulic machine and the hydraulic pump.
- the hydraulic pump working connection is (directly) hydraulically connected to the second valve input connection.
- a switching valve is arranged in the connection between the hydraulic machine working port and the first valve input port or is hydraulically connected between the hydraulic machine working port and the first valve input port, which is in a passage state in which the first valve input port and the Hydraulic machine working connection are hydraulically connected, and can be switched into a blocking state in which the first valve input connection and the hydraulic machine working connection are hydraulically separated. If there is no regenerative lowering or outside the lowering phase, the switching valve is particularly in the passage position. condition, so that the hydraulic machine can supply the valve block, in particular the directional valve arrangement, with hydraulic fluid, for example for lifting a load using the linear consumer.
- the hydraulic machine working connection is hydraulically connected to a return line, which is set up to produce a volume flow of pressurized hydraulic fluid from the first chamber of the linear consumer during the lowering phase when it is connected (i.e. when the first chamber is hydraulically connected to the hydraulic drive is).
- a suitable means e.g. valve
- a return line directional control valve is preferably provided as part of the hydraulic drive (see below).
- the hydraulic drive preferably has a control which is set up to control the switching valve during the lowering phase, to switch it to the blocking state, to control the valve block (in particular the first directional control valve), so that a hydraulic connection is established from the first valve input connection to the first consumer connection is closed, and to control the hydraulic machine to change the swivel angle so that it can or will be operated as a hydraulic motor. These steps take place simultaneously or at least overlapping. If the first consumer connection or the first directional valve can be hydraulically connected to the second valve input connection, the valve block or the directional valve arrangement (in particular the first directional valve and/or the switching valve and/or the summing valve) is controlled by the control during the lowering phase, so that this connection is closed.
- the valve block or the directional valve arrangement in particular the first directional valve and/or the switching valve and/or the summing valve
- the hydraulic drive preferably has an electrical machine which is coupled to the hydraulic machine and the hydraulic pump (in order to drive them or to be driven by them, or is mechanically coupled to the drives, for example drive shafts, the hydraulic machine and the hydraulic pump), wherein If necessary, the control is further preferably set up to control the electrical machine and / or an inverter of the electrical machine, in particular so that the electrical machine acts as an electrical generator during the lowering phase.
- the use of an electric machine to drive the hydraulic machine and the hydraulic pump is advantageous because if the hydraulic machine recovered power exceeds the power required by the hydraulic pump, the excess power can be converted into electrical power by the electrical machine, which can be operated as a generator.
- the electrical energy obtained can be stored in a battery, for example.
- the hydraulic drive has a return line directional control valve which is hydraulically connected to the return line and is hydraulically connectable or connected to the first chamber of the linear consumer and is set up (when connected to the linear consumer) to provide a hydraulic passage between the return line and to close or at least partially open the first chamber in a controllable and/or adjustable manner.
- the return directional control valve is further preferably a proportional valve.
- the control is optionally set up to control the return line directional control valve during the lowering phase and to partially or completely open the hydraulic passage between the return line and the first chamber. Outside the lowering phase, the passage of the return directional control valve is preferably closed. Accordingly, no hydraulic fluid can flow from the linear consumer to the hydraulic machine working connection outside of the lowering phase. If the return line directional valve is a proportional valve (i.e. has intermediate positions), the volume flow from the linear consumer to the hydraulic machine working connection and thus the lowering speed can be controlled.
- the hydraulic drive preferably has a circulation directional control valve which is hydraulically connected to the hydraulic pump working connection and a tank connection of the hydraulic pump and is designed to provide a hydraulic passage between the hydraulic pump working connection and the tank connection of the hydraulic pump in a controllable manner either to close or at least partially open.
- the circulation directional control valve is further preferably a proportional valve.
- the control is set up to control the circulation directional control valve during the lowering phase, to partially or completely open the hydraulic passage between the hydraulic pump working connection and the tank connection.
- hydraulic neutral circulation losses can be avoided.
- the hydraulic pump is a fixed displacement pump.
- the hydraulic pump is an adjustable hydraulic pump. In this case, neutral circulation losses can be avoided even without a circulation directional control valve.
- the hydraulic drive has a compensating directional control valve that is hydraulically connectable or connected to the first chamber and the second chamber and which, when connected, is designed to provide a hydraulic passage between the first Chamber and the second chamber can either be closed or at least partially opened in a controllable manner.
- the compensating directional control valve is further preferably a proportional valve.
- the control is set up to control the compensating directional control valve during the lowering phase and to partially or completely open the hydraulic passage between the first chamber and the second chamber.
- the second chamber is approximately the second chamber of a double-acting hydraulic cylinder.
- the second chamber can be filled accordingly with hydraulic fluid from the first chamber, so that no further supply of hydraulic fluid is necessary.
- the second chamber can again comprise several sub-chambers, for example if the linear consumer comprises several hydraulic cylinders, which together cause the movement (raising/lowering) of the element of the work machine.
- the switching valve and/or possibly the control is set up so that outside the lowering phase, the switching valve is or is switched to the open state.
- the switching valve can, for example, be set up in such a way that it is automatically switched to the open state by a spring or similar if no further control signal is present.
- active control could be carried out by the controller.
- the return line directional valve and/or optionally the control is set up so that outside the lowering phase the hydraulic passage between the first chamber and the return line is closed, and/or is the compensation directional valve and/or optionally the control set up so that outside the lowering phase the hydraulic passage between the first chamber and the second chamber is closed, and/or the circulation directional control valve and/or optionally the control is set up so that outside the lowering phase the hydraulic passage between see the hydraulic pump working connection and the hydraulic pump tank connection being closed.
- the closed position is assumed automatically, for example by a corresponding preload with a spring, if there is no other control, or alternatively or additionally that a corresponding control takes place by the control.
- Figure 1 shows a hydraulic drive according to a preferred embodiment of the invention.
- Figure 2 shows a hydraulic drive according to another preferred embodiment of the invention.
- Figure 3 shows the sequence of a preferred embodiment of the method according to the invention.
- FIG. 1 shows a hydraulic drive according to a preferred embodiment of the invention.
- the hydraulic drive forms an open 2-circuit hydraulic system.
- the hydraulic drive comprises a hydraulic machine 4, a hydraulic pump 6, a valve block, namely, for example, a directional valve arrangement 8, and a switching valve 10.
- the hydraulic machine 4 and the Hydraulic pump 6 or its drive shafts are mechanically coupled to one another, that is, they can be driven together. This coupling can take place, for example, via a drive shaft or a gearbox.
- the speeds of the hydraulic machine 4 and the hydraulic pump 6 are therefore the same or at least have a certain relationship to one another.
- the hydraulic machine 4 and the hydraulic pump 6 are preferably driven by an electrical machine 12, which is connected via an inverter 14 to an electrical energy supply, for example a DC voltage system and/or a battery.
- the inverter 14 can, for example, convert direct current from the electrical power supply into alternating current for the electrical machine when the electrical machine acts as an electric motor, and vice versa convert alternating current into direct current when the electrical machine acts as an electrical generator.
- the hydraulic machine 4 is adjustable, i.e. a pivot angle of the hydraulic machine is adjustable. Furthermore, the hydraulic machine 4 can be swiveled to zero, so it can be operated both as a hydraulic pump (e.g. corresponding to positive swivel angles) and as a hydraulic motor (e.g. corresponding to negative swivel angles). Such a hydraulic machine is also referred to as “mooring capable”.
- the hydraulic machine 4 has a (hydraulic) hydraulic machine working connection 16 and a tank connection 18, which is connected here to a tank 20. In pump operation, the hydraulic machine, for example driven by the electric machine 12, generates a flow of hydraulic fluid (from the tank) from the tank connection 18 to the hydraulic machine working connection 16.
- a volume flow of hydraulic fluid from the hydraulic machine working connection 16 to the tank connection 18 generates a torque or a mechanical power on the drive axle of the hydraulic machine 4, with which the hydraulic pump 6 can be driven (at least partially), and, if excess mechanical power is generated, for example the electrical machine 12 can also be driven.
- the hydraulic pump 6 here is a fixed displacement pump and has a tank connection 23 (here hydraulically connected to the tank 20) and a hydraulic pump working connection 22.
- the hydraulic pump 6 is set up, when driven, to pump hydraulic fluid from the tank connection 23 to the hydraulic pump working connection 22.
- the directional valve arrangement 8 has a first valve inlet connection 24 and a second valve inlet connection 25, via which the directional valve arrangement can be supplied with hydraulic fluid.
- the directional control valve arrangement 8 includes a first directional control valve 26 and at least one second directional control valve 28, wherein the first directional control valve 26 is hydraulically connected to the first valve input connection 24 and the at least one second directional control valve 28 is hydraulically connected to the second valve input connection 25 (each in Not shown individually).
- the directional control valve arrangement can include more than two directional control valves.
- the directional valve arrangement shown is designed, for example, as a modular directional valve block, which can supply several directional valve sections, which can be supplied with hydraulic fluid via input sections in which the valve input connections are provided.
- Each directional valve section corresponds to a directional valve, with respective consumer connections.
- the directional valves of the individual directional valve sections can generally be operated or controlled independently of one another.
- the directional control valves each have, for example, two consumer connections; in general, the directional control valves can also have a different number of consumer connections independently of one another, that is, in general they have at least one consumer connection. If the valve block is not constructed modularly, but rather as a (at least partially) uniform structural unit, the valve block is set up to implement the functionalities that are described below in connection with the directional control valve arrangement
- the first directional control valve 26 and the at least one second directional control valve 28 each have two consumer connections, i.e. hydraulic connections to which hydraulic lines that lead to respective consumers can be connected.
- the first directional control valve 26 and the at least one second directional control valve 28 are designed to completely or partially open or block hydraulic passages or connections from the valve input connections to the consumer connections, depending on how they are controlled, so that the flow of hydraulic fluid can be controlled to each of the consumer connections or to consumers connected to them.
- the first consumer connection 34 can be hydraulically connected to the second valve input connection 25 and/or that the at least one further consumer connection can be hydraulically connected to the first valve input connection (via at least one suitable switching valve and/or at least a suitable summing valve and/or a corresponding functionality of the directional control valves).
- the hydraulic pump working port 22 is hydraulically connected to the second valve input port 25.
- the hydraulic machine working port 16 is connected to the first valve input port 24 via the switching valve 10.
- the switching valve 10 can be switched into an open state (state shown in the figure) and a blocked state. In the open state, the switching valve 10 is open, i.e. there is an (open) hydraulic connection between the hydraulic machine working port 16 and the first valve inlet port 24, so hydraulic fluid can flow between these ports. In the blocked state, the switching valve 10 is closed, i.e. there is no hydraulic connection between the hydraulic machine working port 16 and the first valve inlet port 24, so no hydraulic fluid can flow between these ports.
- the switching valve 10 can be actuated electrically or electromagnetically, for example, and in a further advantageous embodiment the switching valve 10 can also be controlled or actuated electro-hydraulically by, for example, so-called pressure control elements.
- a hydraulic linear consumer 30 or hydraulic cylinder (here a differential cylinder) is shown, which is hydraulically connected to the first directional control valve 26.
- consumer connections of the first directional control valve 26 are hydraulically connected to working connections or chambers of the linear consumer 30.
- a first consumer connection 34 is hydraulically connected to a first chamber 38 and a second consumer connection 36 is hydraulically connected to a second chamber 40.
- the linear consumer can also be referred to as the first hydraulic consumer or as the hydraulic primary consumer.
- another hydraulic consumer 32 (also a differential cylinder here as an example) is shown, which is hydraulically connected to the at least one second directional control valve 28.
- more consumers 32 than those shown can be provided, which are hydraulically connected to corresponding second directional control valves.
- at least one further hydraulic consumer is provided, which also serves as at least one second hydraulic consumer or can be referred to as a hydraulic secondary consumer.
- the linear consumer 30 is set up in such a way, in particular arranged on a work machine in which the hydraulic drive is used, that when hydraulic fluid is fed into the first chamber 38 of the linear consumer by appropriate control of the first directional control valve 26 (and corresponding hydraulic fluid from the second Chamber 40 is passed), a load is lifted (not shown). This can be done, for example, using a boom on the work machine. The load is lifted against the effect of gravity, assuming the machine is in a normal working position. The hydraulic fluid in the first chamber is under a corresponding pressure (caused by the load).
- a return line directional valve 42 which here is a 2/2-way valve with an intermediate position (proportional valve), is preferably provided.
- One port of the return line directional valve is hydraulically connected to the first chamber and the other port of the return line directional valve is hydraulically connected to the hydraulic machine working port 16 via a return line 46.
- the return line directional control valve 42 is adjustable between a closed end position and an open end position, whereby in the closed end position (position shown in the figure) there is no hydraulic connection between the first chamber and the return line or the hydraulic machine working connection and when adjusting in the direction of the open end position, a through opening is increasingly opened or the return line directional control valve 42 is increasingly opened, so that a hydraulic connection exists between the first chamber and the return line or the hydraulic machine working connection and is opened as the cross section increases . In the open end position, the through opening is completely open.
- the return line directional control valve 42 or its adjustment is, for example, electrically controllable, that is, the return line directional control valve 42 can be actuated, for example, electrically or electromagnetically, wherein in a further advantageous embodiment the return line directional control valve 42 is also controlled electro-hydraulically by, for example, so-called pressure control elements or can be operated.
- the closed end position can be a position that is assumed automatically (especially special outside the lowering phase when there is no further control signal, for example, as illustrated, by a biasing element (e.g. spring) that causes a movement into the closed end position.
- pressurized hydraulic fluid is passed from the first chamber 38 of the linear consumer 30 through the return line directional valve 42 and the return line 46 to the hydraulic machine working connection 16, so that the hydraulic machine 4 can be operated as a motor to convert hydraulic energy into mechanical energy (torque, speed).
- the load is reduced accordingly so that potential energy is converted into mechanical energy.
- the mechanical energy is used to drive the hydraulic pump 6 or the generator-operated electrical machine 12.
- the first directional control valve 26 is controlled during the regenerative lowering so that there is no hydraulic connection between the first valve input connection 24 and the first consumer connection 34. If the first consumer connection 34 can be connected hydraulically 25 to the second valve input connection, this connection is closed during the regenerative lowering, the directional valve arrangement is controlled during the regenerative lowering so that there is no hydraulic connection between the second valve input connection 25 and the first consumer connection 34 exists. Preferably, the first directional control valve 26 is additionally controlled during the regenerative lowering so that there is no hydraulic connection between the first valve input connection 24 and the second consumer connection 36 (if the directional control valve arrangement is set up so that such a connection can be established).
- the hydraulic supply of the at least one further consumer 32 is ensured by the hydraulic pump 6, which continues to supply the directional valve arrangement with hydraulic fluid via the second valve input connection 25.
- a compensating directional valve 44 which here is a 2/2-way valve with an intermediate position, is also preferably provided between the first chamber 38 and the second chamber 40 is arranged.
- One connection of the compensating directional valve is hydraulically connected to the first chamber (and therefore also to the first consumer connection) and the other connection of the compensating directional valve is hydraulically connected to the second chamber (and therefore also to the second consumer connection).
- the compensation directional control valve 44 like the return directional control valve 42, is adjustable between a closed end position (no hydraulic connection between the first and second chambers) and an open end position, with a passage starting from the closed end position, in which the passage is closed, is increasingly opened (hydraulic connection with increasing cross-section between the first and second chambers).
- the compensating directional control valve 44 can be actuated electrically or electromagnetically, for example, and in a further advantageous embodiment the compensating directional control valve 44 can also be controlled or actuated electro-hydraulically by, for example, so-called pressure control elements.
- the closed end position can be a position that is assumed automatically (in particular outside the lowering phase when there is no further control signal, for example, as illustrated, by a biasing element (e.g. spring) that causes a movement into the closed end position.
- the compensating directional control valve 44 allows hydraulic fluid to be directed between the chambers. In particular, it is possible to direct hydraulic fluid from the first into the second chamber during regenerative lowering, so that a supply via the first directional valve or the directional valve arrangement 8, which is only hydraulically supplied by the hydraulic pump due to the closed switching valve, is not necessary.
- the speed of lowering can be controlled by appropriately controlling the return directional control valve 42 and/or the compensating directional control valve 44, i.e. by controlling the cross sections of the respective passages.
- the compensation directional control valve 44 is designed here as a separate valve. Alternatively, the compensation directional control valve or its functionality could also be integrated in the first directional control valve 26.
- a single-acting hydraulic cylinder can also be used (so that only the first chamber is pressurized with hydraulic fluid, with only the first consumer connection on the first directional valve that can be connected or connected to the first chamber is provided and the second consumer connection can be dispensed with).
- the compensation directional control valve 44 can be dispensed with.
- a circulation directional control valve 48 which here is a 2/2-way valve with an intermediate position, is preferably provided between the hydraulic pump working connection 22 and the tank connection 23 of the hydraulic pump 6.
- One connection of the circulation directional control valve is hydraulically connected to the hydraulic pump working connection 22 (and therefore also to the valve input connection 24) and the other connection of the circulation directional control valve is connected to the tank connection 23 of the hydraulic pump 6 (and therefore also to the tank). hydraulically connected.
- the circulation directional control valve 48 like the return directional control valve 42 and the compensation directional control valve 44, is adjustable between a closed end position (no hydraulic connection between the hydraulic pump working connection 22 and the tank connection 23) and an open end position, with one passage starting from the closed end position in which the passage is closed, is increasingly opened (hydraulic connection with increasing cross section between the hydraulic pump working connection 22 and the tank connection 23).
- the circulation directional valve 48 can be actuated electrically or electromagnetically, for example, and in a further advantageous embodiment the circulation directional valve 48 can also be controlled or actuated electro-hydraulically by, for example, so-called pressure control elements.
- the circulation directional control valve 48 can be controlled to assume an at least partially open position. This is useful because neutral circulation losses can be reduced.
- the closed end position can be a position that is assumed automatically (in particular outside the lowering phase when there is no further control signal, for example, as illustrated, by a biasing element (e.g. spring) that causes a movement into the closed end position.
- the hydraulic drive can further comprise an (electronic) control 50, which is set up to control the hydraulic machine 4, the switching valve 10 and the directional control valve arrangement 8 or the first directional control valve 26 and optionally the at least one second directional control valve 28.
- the controller 50 can be set up to control the electrical machine 12 or the inverter 14, the return directional control valve 42, the compensation directional control valve 44 and the circulation directional control valve 48, if available. In any case, control can take place via appropriate control lines (not shown).
- the controller 50 is set up to control the switching valve 10 during a regenerative lowering or during a lowering phase, so that it is switched to the blocking state, and to control the adjustable hydraulic machine 4 or its pivot angle, so that the hydraulic machine 4 acts as a hydraulic motor.
- the swivel angle is swiveled through zero, so that the hydraulic machine generates a torque on the drive shaft for a given direction of rotation.
- the return line directional control valve 42 is controlled by the controller 50 to switch to an at least partially open position.
- the controller 50 also controls the first directional control valve 26 to switch to a state in which there is no hydraulic connection between the first valve input connection 24 and the first consumer connection 34.
- the compensating directional control valve 44 is controlled to switch to an at least partially open position.
- the lowering speed can be controlled by a suitable choice of the open position of the return line directional control valve 42 and, if necessary, the open position of the compensation directional control valve 44.
- the controller 50 can optionally control the circulation valve 48 to switch to an at least partially open position.
- the controller 50 can optionally control the electrical machine 12 or the inverter 14 to reduce the power output or torque output of the electrical machine 12.
- the electric machine 12 can act as an electric generator.
- FIG. 2 shows a hydraulic drive according to another preferred embodiment of the invention. This essentially corresponds to the embodiment shown in FIG. 1, so that only differences will be discussed below and reference is otherwise made to the description of FIG. 1.
- the hydraulic pump 6 of the embodiment of Figure 2 is an adjustable hydraulic pump. Furthermore, no circulation directional control valve is provided. Since the hydraulic pump 6 is adjustable, the delivery volume flow of the hydraulic pump (at a given speed) can be adjusted, approximately corresponding to a pivot angle of the hydraulic pump 6. In particular, if during a regenerative lowering the at least one further consumer 32 requires little or no hydraulic power, the pivot angle of the hydraulic pump 6 can be adjusted to zero or close to zero, so that no or only a small delivery volume flow is generated. Accordingly, neutral circulation losses can be reduced in the hydraulic drive of FIG. 2 even without a circulation directional control valve.
- the controller 50 is preferably set up to control the hydraulic pump 6 or its pivot angle. If no or only little hydraulic power is required by the at least one second consumer 32 during the regenerative lowering, unlike in Figure 1 where the circulation directional control valve is at least partially opened, the controller 50 can set the pivot angle of the adjustable hydraulic pump to zero or close to zero, i.e. control the adjustable hydraulic pump accordingly.
- Figure 3 shows the sequence of a preferred embodiment of the method according to the invention. Steps that are carried out during a lowering phase are shown here. It is a method for the regenerative lowering of an element of a work machine, which is driven by a hydraulic drive according to the invention (e.g. according to Figures 1 to 2). A supply or removal of hydraulic fluid to the linear consumer causes the element to be raised or lowered.
- step 100 the switching valve is switched to the blocking state.
- step 110 a volume flow of hydraulic fluid is directed from the first chamber to the working port of the hydraulic machine and in step 120 the hydraulic connection from the first valve inlet port to the first consumer port is closed.
- step 130 the pivot angle of the hydraulic machine is changed so that it acts as a hydraulic motor.
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- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
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- Analytical Chemistry (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022206509.3A DE102022206509A1 (de) | 2022-06-28 | 2022-06-28 | Hydraulischer Antrieb und Verfahren zum regenerativen Absenken eines Elements einer Arbeitsmaschine |
| PCT/EP2023/067258 WO2024002941A1 (de) | 2022-06-28 | 2023-06-26 | Hydraulischer antrieb und verfahren zum regenerativen absenken eines elements einer arbeitsmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4547912A1 true EP4547912A1 (de) | 2025-05-07 |
| EP4547912B1 EP4547912B1 (de) | 2026-03-11 |
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ID=87036627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23735286.9A Active EP4547912B1 (de) | 2022-06-28 | 2023-06-26 | Hydraulischer antrieb und verfahren zum regenerativen absenken eines elements einer arbeitsmaschine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4547912B1 (de) |
| CN (1) | CN119731390A (de) |
| DE (1) | DE102022206509A1 (de) |
| WO (1) | WO2024002941A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998013603A1 (en) * | 1996-09-25 | 1998-04-02 | Komatsu Ltd. | Hydraulic oil recovery/reutilization system |
| US9151019B2 (en) | 2009-09-15 | 2015-10-06 | Sumitomo Heavy Industries, Ltd. | Hybrid type construction machine |
| JP5687150B2 (ja) | 2011-07-25 | 2015-03-18 | 日立建機株式会社 | 建設機械 |
| DE102016003390A1 (de) | 2015-10-23 | 2017-04-27 | Liebherr France Sas | Vorrichtung zur Rückgewinnung hydraulischer Energie bei einem Arbeitsgerät und ein entsprechendes Arbeitsgerät |
| JP6891079B2 (ja) * | 2017-09-15 | 2021-06-18 | 川崎重工業株式会社 | 建設機械の油圧駆動システム |
-
2022
- 2022-06-28 DE DE102022206509.3A patent/DE102022206509A1/de active Pending
-
2023
- 2023-06-26 CN CN202380060233.8A patent/CN119731390A/zh active Pending
- 2023-06-26 WO PCT/EP2023/067258 patent/WO2024002941A1/de not_active Ceased
- 2023-06-26 EP EP23735286.9A patent/EP4547912B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024002941A1 (de) | 2024-01-04 |
| CN119731390A (zh) | 2025-03-28 |
| DE102022206509A1 (de) | 2023-12-28 |
| EP4547912B1 (de) | 2026-03-11 |
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