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WO/2021/193187A1 |
A work vehicle in which a cargo handling device is operated by an electrical operation lever, wherein the engine is prevented from stalling regardless of the type of system installed in the vehicle body. A wheel loader 1 comprising a c...
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WO/2021/191494A1 |
A load sensing control system for controlling a hydraulic system comprises at least one pressure sensor (101-106) configured to measure pressure of at least one hydraulic cylinder (111-113) of the hydraulic system, a torque controlled el...
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WO/2021/194356A1 |
Construction or worksite machines and related apparatus for use on such machines in various examples have at least one hydraulic cylinder for operating a lift/lower element; at least one hydraulic pump that has at least one electric moto...
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WO/2021/187007A1 |
In order to facilitate a manufacturing operation and an assembly operation, an arm first direction switching valve 41 incorporates an arm regeneration passage 43 through which oil discharged from a rod chamber a4 when an arm hydraulic cy...
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WO/2021/187181A1 |
A coupler cylinder (21) is driven between a lock state and an unlock state of a bucket (6) due to working oil being supplied. A main pump (23) supplies working oil to the coupler cylinder (21). A pressure-raising valve (25) controls the ...
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WO/2021/186998A1 |
A control device controls the motion of a valve body of a valve device provided in a hydraulic system, wherein: the control device has a stroke command calculation unit that calculates a stroke command for the valve body on the basis of ...
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WO/2021/184848A1 |
Disclosed are a hydraulic operating mechanism and a control valve thereof. The control valve of the hydraulic operating mechanism comprises a high-pressure oil port, working oil ports and a low-pressure oil port, and the control valve fu...
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WO/2021/179356A1 |
A transverse vibration rolling system for a double-layer metal composite ultra-thin strip and a manufacturing method. The transverse vibration rolling system comprises a first roller (1), a second roller (2), a first hydraulic vibrator (...
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WO/2021/174931A1 |
Disclosed are a device and system with a control logic for automatically switching between high and low pressure, and a control method therefor. The device with a control logic for automatically switching between high and low pressure co...
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WO/2021/175945A1 |
The invention relates to a method for controlling the flow rate and/or pressure in a hydraulic installation comprising a control valve with control unit, the control unit determining a control deviation between a setpoint value and an ac...
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WO/2021/172098A1 |
A fluid pressure drive unit (100) is provided with: a bottom-side check valve (30) that is provided in a bottom-side passage (15) and is opened as a result of hydraulic oil discharged from a rod-side port (20B) of a pump (20) being guide...
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WO/2021/169175A1 |
An oilway structure for achieving precise control of a double-acting cylinder, comprising a double-acting cylinder (1), an oil inlet pipeline (2), an oil outlet pipeline (3), a first accumulator (71), and a second accumulator (72). One e...
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WO/2021/166325A1 |
The purpose of this invention is to enable a valve to be appropriately driven in a valve drive system. To achieve this purpose, a valve drive system (S1) is provided with a gas-actuated valve (71) that forms a flow channel for a fluid (F...
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WO/2021/165150A1 |
The hydraulic servo actuator contains a piston rod (3) and two pistons (K1, K2) which are arranged in tandem thereon and each of which is movably mounted in a separate hydraulic cylinder (Z1, Z2). Two separate redundant hydraulic circuit...
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WO/2021/168127A1 |
A hydraulic control assembly includes means for holding pressure in a cylinder to inhibit boom or arm drop of a machine in the event that a hose between the cylinder and a main control valve (MCV) ruptures. The pressure holding means of ...
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WO/2021/149415A1 |
An electrohydraulic circuit (1) and an aircraft comprise: a supply oil path (90) connecting an oil supply device (10) that supplies hydraulic oil, and a drive unit (20) driven by the hydraulic pressure of the hydraulic oil supplied from ...
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WO/2021/150534A1 |
A controller may identify a command to move an implement in a particular direction and an amount of time for the implement to move in the particular direction. The controller may determine an estimated velocity of the implement moving in...
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WO/2021/149416A1 |
Provided are a selector valve, an electro-hydraulic circuit and an aircraft that are lightweight and capable of suppressing an overload. A selector valve 30, an electro-hydraulic circuit 1 and an aircraft comprise a sleeve 32, which is p...
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WO/2021/144143A1 |
PROBLEM: To enable to arbitrarily change a hydraulic pump which supplies pressure oil to a hydraulic actuator at first in a hydraulic control system equipped with the hydraulic actuator using both first and second hydraulic pumps as a pr...
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WO/2021/141874A1 |
An example valve includes a first port fluidly coupled to a source of fluid, a second port fluidly coupled to an actuator, a third port fluidly coupled to a reservoir, and a fourth port configured to export a load-sense (LS) fluid signal...
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WO/2021/140821A1 |
A hydraulic pump system provided with: a hydraulic pump the discharge flow rate of which can be changed; a regulator device for adjusting the discharge flow rate of the hydraulic pump; an operation device having an operation tool; a lock...
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WO/2021/136691A1 |
A valve arrangement is described comprising a housing arrangement (12), (18), a first spool valve (1a, 1b) having a first spool (3a, 3b) and a second spool valve (2a, 2b) having a second spool (4a, 4b), wherein the first spool valve (1a,...
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WO/2021/131701A1 |
This control system for a work machine comprises: a plurality of hydraulic pumps that discharge hydraulic oil; a hydraulic cylinder that operates a work machine element; a plurality of flow rate control valves that are respectively conne...
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WO/2021/131700A1 |
A control system for a work machine according to the present invention is provided with: a hydraulic pump; a hydraulic cylinder that causes a work machine element to operate within a movable range on the basis of hydraulic oil supplied f...
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WO/2021/131277A1 |
Provided is a work machine that, if the pressure difference between a hydraulic pump and an actuator is great and the required flow rate of the actuator is small, can improve the control precision of the actuator. An auxiliary flow rat...
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WO/2021/132514A1 |
The present invention limits a speed change in the operation speed of a low-load hydraulic actuator (MT) having a low operation pressure. A work machine (1) is provided with: a plurality of hydraulic actuators; a plurality of direction s...
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WO/2021/132569A1 |
A first piston (114) of a first cylinder (110) and a second piston (134) of a second cylinder (130) are connected so as to achieve the same amount of displacement. One pressure-receiving area of the first piston (114) is the smallest, an...
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WO/2021/124767A1 |
A hydraulic circuit (5) is provided with an integrated controller (7) for controlling the discharge amount of a variable-capacity pump (51) by means of a hydraulic signal in accordance with a negative control pressure, and a travel detec...
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WO/2021/118064A1 |
A non-powered fluid pressure-intensifying apparatus according to the present invention, which can itself intensify the pressure of introduced fluid and discharge same without a separate external power supply or adjustment device, may com...
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WO/2021/114669A1 |
A boom hydraulic system, comprising an oil tank (10), a hydraulic pump (1), boom cylinders (8), a multi-way valve (9), and a reversing valve (4). The hydraulic pump comprises a sealed working chamber (11) and an oil outlet channel (12), ...
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WO/2021/114668A1 |
Provided are an open hydraulic pump and open hydraulic system; the open hydraulic pump has a sealed working chamber (1), and an oil outlet passageway (2) and a first oil suction passageway (3), each of which are in communication with the...
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WO/2021/111739A1 |
A working fluid supply system (100) is provided with: first and second oil pumps (10, 11) driven by an engine (50); a switching valve (24) for connecting a discharge passage (17) of the second oil pump (11) with a supply passage (14) and...
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WO/2021/110866A1 |
The invention relates to a hydraulic system for a hydraulically actuatable working machine, comprising a switch valve block with multiple valve block inlets for connecting to a respective pressure outlet of one or more hydraulic fluid pu...
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WO/2021/110853A1 |
The invention relates to a switch valve block for a hydraulically actuatable working machine, comprising multiple valve block inlets for connecting to a respective pressure outlet of one or more hydraulic fluid pump(s), multiple valve bl...
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WO/2021/112728A1 |
The present invention regards an electro-hydraulic linear actuator (1) and a method of controlling the operation of the electro-hydraulic linear actuator (1). The electro-hydraulic linear actuator (1) comprises one single cylinder housin...
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WO/2021/112750A1 |
The present invention regards an electro-hydraulic linear actuator (1) and a method of controlling the operation of the electro-hydraulic linear actuator (1). The electro-hydraulic linear actuator (1) comprises one single cylinder housin...
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WO/2021/104966A1 |
The present invention relates to an electrohydrostatic system having a hydraulic cylinder comprising a first cylinder chamber and a second cylinder chamber. Furthermore, the electrohydrostatic system has a fluid hydraulic supply device f...
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WO/2021/103578A1 |
A pneumatic hydraulic safety system, comprising an air storage tank (4), a pressure switch (9), a two-position two-way switching valve (10), a three-position five-way reversing valve (11), a shuttle valve (12), a two-position two-way pne...
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WO/2021/099025A1 |
The invention relates to an electrohydraulic actuator for use under water, having: an electrically driven pump; at least one hydraulic cylinder that comprises at least one or two cylinder chambers and a slidable piston which delimits the...
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WO/2021/090627A1 |
Provided is a construction machine in which a hydraulic actuator is driven by a closed-circuit hydraulic pump, and with which a shortage of oil film in the closed-circuit hydraulic pump can be prevented, reliability can be improved, and ...
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WO/2021/088391A1 |
A hydraulic system for achieving a sequential operation of an engineering vehicle mechanism, comprising: an electric motor (1), a hydraulic pump (2), an electromagnetic reversing valve (3), a sequence valve I (4), a hydraulic execution e...
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WO/2021/092001A1 |
Aspects of the disclosure relate to a hydraulic amplifier (100). The hydraulic amplifier may include a piston body (110) having a movable piston (210) that divides an interior of the piston body into a first chamber (222) and a second ch...
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WO/2021/084493A1 |
An actuating device (10) comprises a first (14) and a second (16) working chamber supplied with pressurized air from a source (18) of pressurized air by means of a first (20) and a second (22) pressure regulator, respectively, for regula...
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WO/2021/086859A1 |
A hydraulic actuator system includes a load sense assembly that is configured to transmit a load sense signal to a variable pump to vary a flow of pressurized fluid from the variable pump in response to the load sense signal to generate ...
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WO/2021/085016A1 |
A regeneration device comprising a regeneration valve for controlling the flow rate of a working liquid discharged from one port of a cylinder, a check valve for allowing a flow for regenerating the working liquid from the regeneration v...
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WO/2021/082169A1 |
A hydraulic power system for a downhole device, comprising: a first motor (10), a first hydraulic pump (11), a second hydraulic pump (12), a first main oil circuit A, a second main oil circuit B, a switching control module (13) and a fir...
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WO/2021/085257A1 |
This multiple-control valve unit (1A) includes a housing (2) having a plurality of mutually parallel spools (3) embedded therein. A plurality of pilot chambers (31, 32) corresponding to both ends of the spools (3) are formed inside the h...
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WO/2021/082274A1 |
A hydraulic control system (1), an outrigger device, and a control method. The hydraulic control system (1) comprises: an oil cylinder (13); a main reversing valve (11) and an auxiliary reversing valve (12), the first valve port (111) of...
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WO/2021/082275A1 |
The present application provides a leveling control system and method for a working bucket of an aerial lift truck, and an aerial lift truck. The leveling control system comprises: an inclination measurement device, which measures the in...
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WO/2021/078754A1 |
The invention relates to a method for operating a pressure wave generator (1) with a pressure chamber (2), said pressure wave generator (1) comprising • a closure element (9) which in a closed position closes the pressure chamber (2) r...
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