A shovel includes a main pump, a hydraulic actuator, and an accumulator part. The hydraulic actuator is configured to be driven with hydraulic oil discharged by the main pump. The accumulator part is configured to store the hydraulic oil discharged from the hydraulic actuator and discharge the hydraulic oil to the intake side of the main pump.

A pressure amplifier (1) is described comprising a housing (2), an amplification piston (5) in the housing (2) having a high pressure area (9) in a high pressure chamber (5) and a low pressure area (8) in a low pressure chamber (3), and a switching valve (11) having a pressured control valve element having a larger pressure area (16) and a small pressure area (17). Such a pressure amplifier should have a high operating frequency. To this end the valve element (10) and the amplification piston (5) are located in a same bore (3, 4) in the housing (2).

The present disclosure provides a control valve assembly arranged between a main control valve and a hydraulic function on a mobile machine. The control valve assembly includes a fluid source, a first supply valve, a first return valve, a second supply valve, and a second return valve. The control valve assembly further includes a controller configured to determine if an actual motion parameter of the hydraulic function is different than a desired motion parameter based on the determination of a motion sensor. The controller configured to selectively move at least one of the first supply valve, the first return valve, the second supply valve, and the second return valve to adjust the actual motion parameter of the hydraulic function and compensate for a difference between the actual motion parameter and the desired motion parameter.

A pressure supply device in accordance to one or more aspects includes an elongated body having an internal bore extending from a power end to a discharge end having a discharge port, two or more gas generators connected to the power end and a hydraulic fluid disposed in the bore between a piston and the discharge end. The ignition of one of the gas generators drives the piston to exhaust a partial volume of the hydraulic fluid that is less than the total operational volume of the hydraulic fluid under pressure to operate at a connected device.

A hybrid swing drive system (1) of a hydraulic construction machine includes a variable displacement hydraulic swing pump (3) operable by a prime mover (2); a hydraulic swing motor (16) for performing a swing function of the machine; an accumulator (10); a controller (244); a swing control valve assembly (15) disposed in a first hydraulic path extending from the swing pump to the swing motor, the swing control valve assembly having a first position fluidly connecting the swing pump to a first side of the swing motor and a second position fluidly connecting the swing pump to a second side of the swing motor; and an accumulator control valve (12) having an open position fluidly connecting the accumulator to the first hydraulic path at an accumulator control valve connection point and a closed position fluidly isolating the accumulator from the first hydraulic path.

A pressure compensating device includes a diaphragm and a holding element. The holding element has a bearing surface facing the diaphragm. A cohesive or materially-bonded connection is formed at the bearing surface between the diaphragm and the holding element. The diaphragm is fixed to the bearing surface of the holding element by the cohesive connection. A cover which is fixed to the holding element has at least one first receiving device or receptacle at least partly receiving the diaphragm. The cover presses the diaphragm at least partly onto the cohesive connection and presses the cohesive connection onto the bearing surface of the holding element. A housing component having a pressure compensating device and a control unit having a housing are also provided.

A hydraulic control system for a machine is provided. The hydraulic control system includes a fluid reservoir, a pump motor and an accumulator. The pump motor is configured to provide pressurized fluid and to receive fluid to provide a power output. The hydraulic control system further includes a hydraulic actuator having a first and a second chamber, a first valve, a regenerative valve, and a controller. The controller is in communication with the first valve and the regenerative valve to selectively actuate the regenerative valve to allow flow of a first portion of the fluid from the first chamber to the second chamber. The controller is further configured to selectively actuate the first valve to allow flow of a second portion of the fluid from the first chamber through the pump motor to provide the power output to a shaft of a power source.

A hydraulic charging and driving system (4), aircraft employing the same, and corresponding methods, for extending and retracting a hydraulic actuator (2), comprising: a motor assembly (22); and an accumulator assembly (20), the motor assembly (22) and the accumulator assembly (20) being hydraulically coupled to each other; wherein the motor assembly (22) is arranged to recharge the accumulator assembly (20) with hydraulic fluid at a relatively slow rate that is slower than the rate at which the accumulator assembly (20) is arranged to discharge when actuating the hydraulic actuator (2). The system may further comprise a selector valve (24). The accumulator assembly (20) may comprise an accumulator chamber (30), and a compression means (32) provided within the accumulator chamber (30). The motor assembly (22) may comprise a motor (42) arranged to vary a volume of a hydraulic charging chamber (38) of the motor assembly (22).

A hydraulic control system for a machine is provided. The hydraulic control system includes a fluid reservoir, a pump motor and an accumulator. The pump motor is configured to provide pressurized fluid and to receive fluid to provide a power output. The hydraulic control system further includes a hydraulic actuator having a first and a second chamber, a first valve, a regenerative valve, and a controller. The controller is in communication with the first valve and the regenerative valve to selectively actuate the regenerative valve to allow flow of a first portion of the fluid from the first chamber to the second chamber. The controller is further configured to selectively actuate the first valve to allow flow of a second portion of the fluid from the first chamber through the pump motor to provide the power output to a shaft of a power source.

This present disclosure relates to a device for recovering hydraulic energy in an implement with a mooring pump for operation as pump or as motor, with a high-pressure accumulator and with a throttle differential circuit for connecting the bottom side of a working cylinder with the rod side of the working cylinder of the implement, and to a corresponding implement.