Abstract: An arrangement for charging an accumulator with hydraulic fluid is provided. The accumulator is used in a hydraulic boom suspension system for a lift arm of a vehicle and the arrangement includes a first hydraulic pump arranged to supply hydraulic fluid to a hydraulic cylinder system of the lift arm, and a second hydraulic pump arranged to supply hydraulic fluid to a second hydraulic system. The second hydraulic pump is further arranged to supply hydraulic fluid for charging the accumulator.

Abstract: An electric vehicle comprises an electrical system and a hydraulic system. The electrical system comprises an electric power supply and an electric motor-generator connected to the drive train of the vehicle. The hydraulic system includes a pump, and a hydraulic actuator. At least one of the electrical system and the hydraulic system includes energy recovery means arranged to convert kinetic energy from the drive train to electrical energy or to convert kinetic energy from the hydraulic actuator into hydraulic pressure respectively. The electrical and hydraulic systems are connected such that the recovered energy may be converted from electrical to hydraulic energy and/or vice versa. The hydraulic system may further include a hydraulic accumulator.

Abstract: The invention relates to a wind energy system with at least one pitch adjustment system for adjusting the pitch of at least one rotor blade of the wind energy system, wherein the pitch adjustment system comprises at least one electrohydraulic drive that comprises an unregulated electromotor rotating in one direction of rotation for generating pressure.

Abstract: Provided is an electric construction machine adapted to prevent an electric current, after flowing in via a junction at which power transmission systems join together, from flowing into at least one connector to which an external power supply is not connected. Power transmission systems 71A, 71B, 71C connected to connectors 59A, 59B, 59C are all caused to join with a common system 73 at a junction before being connected to a control unit 35. The power transmission systems 71A, 71B, and 71C include switches 74Aa, 74Ab, 74Ba, 74Bb, 74Ca, 74Cb.

Abstract: A press for pressing workpieces can have a) at least two pressing tools and at least one slide that performs working movements with an associated working stroke, b) at least one hydraulic slide drive unit for the slide, which separates a first sub-chamber and a second sub-chamber of a working chamber, and c) at least one slide position measurement device. Additionally, the press can include d) at least one medium reservoir, e) at least one first hydraulic delivery device connected to the first sub-chamber and to the medium reservoir, and f) at least one second hydraulic delivery device. The press can further include g) at least one controllable hydraulic valve, and h) a control device that checks the volumetric flows, pressures, and flow direction of hydraulic medium as a function of the measured slide position and stored or desired movement profiles of the slide and/or of input information from users.

Abstract: A hydraulic drive system for driving a load includes a drive shaft; first and second hydraulic pumps driven by the drive shaft, and a control system that operates the hydraulic drive system in a plurality of modes including: a) a first mode where the second hydraulic pump pumps hydraulic fluid from a supply line to an accumulator; b) a second mode where the second hydraulic pump pumps hydraulic fluid from the accumulator to the supply line; c) a third mode where the second hydraulic pump pumps hydraulic fluid from the supply line to a reservoir; and d) a fourth mode where the second hydraulic pump pumps hydraulic fluid from the reservoir to the supply line. At least the second hydraulic pump is a variable displacement bidirectional pump.

Abstract: Methods and systems for improving operation of a vehicle driveline that includes an engine and an automatic transmission with a torque converter are presented. In one non-limiting example, the engine may be stopped while a vehicle in which the engine operates is rolling. A transmission coupled to the engine may be shifted as the vehicle rolls so that vehicle response may be improved if a driver requests an increase of engine torque.

Abstract: The present invention relates to a hydraulic valve arrangement for controlling/regulating at least one hydraulic consumer of a mobile machine, with a summation interconnection of at least two hydraulic valves and at least one consumer interconnection of hydraulic valves, wherein the outputs of the summation interconnection are hydraulically connected with the inputs of the consumer interconnection, wherein at least one backflow valve is provided in the consumer interconnection. According to the invention, the at least one backflow valve for throttling a consumer return volume flow opens or closes in dependence on a consumer inflow pressure and comprises at least one main piston arranged in a bushing and at least two further pistons arranged in a lid separate from the bushing.

Abstract: A subsea energy storage for well control equipment, wherein stored energy near a well on the sea floor monitors and activates well control equipment independently of, or in conjunction with, hydraulic energy. Energy to the subsea energy storage can be supplied by surface umbilical, remotely-operated vehicle, or by subsea electrical generation from stored hydraulic energy. Stored electrical energy may also recharge stored hydraulic energy. A subsea control system is configured to record data, compare the data to predetermined event signatures, and operate the well control equipment with stored electrical energy.

Abstract: A pump housing arrangement of a hydraulic assembly for a vehicle brake system includes a pump housing. At least one pump is arranged in the pump housing, and is configured to pump brake fluid for the vehicle brake system. A master brake cylinder for the vehicle brake system is also arranged in the pump housing.

Abstract: A hydraulic system for recovering hydraulic energy, the hydraulic system made of at least: a first actuator for generating hydraulic energy and providing fluid under pressure; a tank line for receiving the fluid under pressure drained from the first actuator; a second actuator driven by the fluid under pressure drained from the first actuator; a recovery line for supplying the fluid under pressure drained from the first actuator. The system further includes a pressure compensating valve which controls flow of fluid in the tank line and maintains a fluid pressure differential across a first directional control valve. The first pressure compensating valve is provided with a first fluid pressure sensing line in communication with the recovery line and a second fluid pressure sensing line in communication with the first actuator.

Abstract: This invention presents a method for conversion of heat to electrical power through absorption of heat from any types of fluids with temperatures both higher and lower than 0° C. Heat can be absorbed from fossil or renewable energy resources. The mechanism in this invention uses fluid internal energy and enthalpy difference to generate power, where a reciprocating piston-cylinder system provides the required force to rotate a turbine for power generation.

Abstract: A control system for a hydraulic system including an accumulator and a hydraulic transformer coordinates flow sharing within the hydraulic system. The hydraulic transformer includes first and second variable displacement pump/motor units mounted on a rotatable shaft. The rotatable shaft has an end adapted for connection to a first external load. The first variable displacement pump/motor unit includes a first side that fluidly connects to a pump and a second side that fluidly connects to a tank. The second variable displacement pump/motor unit includes a first side that fluidly connects to the accumulator and a second side that fluidly connects with the tank. A second external load may be hydraulically connected to the hydraulic system. Energy may be transferred to/from the pump, the accumulator, the first external load, and/or the second external load, as directed by the control system.

Abstract: A drive control system of a hydraulic excavator includes a control device. When accelerating a turning body to a target turning speed, the drive control device controls an operation of the electric motor driving device such that the electric motor outputs high efficiency torque by which a highest electric power efficiency is obtained at the target turning speed. The control device controls an operation of an oil pressure supply device such that residual torque obtained by subtracting the high efficiency torque from target torque is output from an oil-pressure motor.

Abstract: A damper operation control device of a working vehicle, includes: a boom pivotably supported on a vehicle body; a bucket pivotably supported on a tip end of the boom; a lift cylinder which drives the boom; an accumulator connected to the lift cylinder through a branched oil passage; a switching valve connected to the branched oil passage between the lift cylinder and the accumulator, the switching valve switching between a connected state and a disconnected state between the lift cylinder and the accumulator; and a controller which performs switch control of the switching valve, wherein the controller includes: a state detecting unit which detects whether the bucket is in a loaded state; and a switching valve control unit which switches the switching valve to the connected state when the state detecting unit detects that the bucket is in the loaded state.

Abstract: A control system for a hydraulic system including an accumulator and a hydraulic transformer coordinates flow sharing within the hydraulic system. The hydraulic transformer includes first and second variable displacement pump/motor units mounted on a rotatable shaft. The rotatable shaft has an end adapted for connection to a first external load. The first variable displacement pump/motor unit includes a first side that fluidly connects to a pump and a second side that fluidly connects to a tank. The second variable displacement pump/motor unit includes a first side that fluidly connects to the accumulator and a second side that fluidly connects with the tank. A second external load may be hydraulically connected to the hydraulic system. Energy may be transferred to/from the pump, the accumulator, the first external load, and/or the second external load, as directed by the control system.

Abstract: A harvester is provided for felling and processing a tree, the harvester including traction devices and a harvester head. The harvester includes an integrated hydraulic system for operating the traction devices and the harvester head. More particularly, the harvester includes an integrated load sense system for operating the traction devices and the harvester head.

Abstract: A power source apparatus includes a controller that carries out horsepower control to determine a flow rate of a hydraulic pump in accordance with a discharge pressure of the hydraulic pump detected by a pump pressure determination sensor. In horsepower control, the controller determines the flow rate such that a maximum input setting for the hydraulic pump defined by the discharge pressure and the flow rate is greater than a maximum output of the engine when the discharge pressure is a first discharge pressure, gradually becomes smaller as the discharge pressure changes from the first discharge pressure towards a higher pressure, and becomes smaller than the maximum output of the engine when the discharge pressure is a second discharge pressure.

Abstract: A subsea energy storage for well control equipment, wherein stored energy near a well on the sea floor monitors and activates well control equipment independently of, or in conjunction with, hydraulic energy. Energy to the subsea energy storage can be supplied by surface umbilical, remotely-operated vehicle, or by subsea electrical generation from stored hydraulic energy. Stored electrical energy may also recharge stored hydraulic energy. A subsea control system is configured to record data, compare the data to predetermined event signatures, and operate the well control equipment with stored electrical energy.

Abstract: A device for transferring a hydraulic working pressure in a pressure fluid for pressure actuating hydraulic units of deep sea systems, in particular deepwater wells, includes a first pressure chamber (19) for the pressure fluid, a displaceable piston arrangement (9, 11, 13) for changing the volume of the pressure chamber (19), and at least one second pressure chamber (21) in a cylinder arrangement (1). The surrounding pressure of the deep sea can be applied to the second pressure chamber for a displacement of the piston arrangement (9, 11, 13) generating the working pressure in the first pressure chamber (19). A pressure accumulator (37) is associated with the cylinder arrangement (1). The displaceable separating element (41) of the pressure accumulator separates a chamber (45) connected to the seawater from an actuating chamber (43) containing an actuating fluid and connected to the second pressure chamber (21) to apply the deep sea pressure to the second pressure chamber by the actuating fluid.

Abstract: A subsea actuator comprising a plurality of chambers and at least three pressure levels, including an ambient pressure (medium), a substantially higher than ambient pressure (high), and an at or near surface atmospheric pressure or at a partial or full vacuum (low) to achieve a precise control of the actuator's closing force, speed, and stroke/position. The actuator enables full operations in emergency situations via manual or ROV operations; and can be operated (one way) to extend without supplied fluids in the event of high pressure failure emergency.

Abstract: An apparatus for recuperation of hydraulic energy from an actuator comprises a first hydraulic machine having a first drive and a second hydraulic machine having a second drive mechanically coupled to the first drive. The first hydraulic machine is in hydraulic communication with an actuator, and the second hydraulic machine (20) is in hydraulic communication with an accumulator.

Abstract: The present invention provides a distributed combined cooling, heating and power generating apparatus with an internal combustion engine by combining solar energy and alternative fuel and a method thereof, the apparatus comprising: an energy storage system for combined reaction between solar energy and alternative fuel, a solar fuel internal combustion engine generating system, a lithium bromide refrigeration system for absorbing exhaust heat of flue gas of solar fuel, a reaction device for recovering exhaust heat of flue gas, a heat exchanger for recovering exhaust heat of exhaust gas and a cylinder jacket and water plate heat exchanger.

Abstract: A device is for a release module for attaching a pipe string to a heave compensated, load bearing unit arranged on a floating installation, where two or more hydraulic cylinder units form an extendable connection between the heave compensated, load bearing unit and a portion of the pipe string.

Abstract: The fluid expansion engine uses a liquid working fluid contained by primary pressurized cylinders. A heat exchange system alternately cycles hot and cold through the primary pressurized cylinders. As a result, the liquid working fluid in the cylinders reciprocally expands and contracts. The work done by the fluid expansion engine is extracted via a hydraulic pump and gearbox connected to secondary pressurized cylinders attached to the primary pressurized cylinders.

Abstract: A pressure intensifier for ejecting fluid at a constant flow rate includes a hydraulic pump, a hydraulic motor, a supply channel, a first control unit, and a second control unit. The hydraulic pump pumps an introduced fluid to eject the fluid through an ejection channel. The hydraulic motor is driven by the introduced fluid and drives the hydraulic pump to cause the fluid ejected by the hydraulic pump to be intensified. The supply channel allows the hydraulic pump and the hydraulic motor to be supplied with the fluid. The first control unit opens or closes the supply channel, and the second control unit operates the first control unit to cause the first control unit to close the supply channel if the fluid ejected through the ejection channel is larger than a predetermined pressure.

Abstract: A hydraulic control circuit includes an oil pump for generating a hydraulic pressure by being rotated by power of a driving force source, a line pressure oil passage in which at least a line pressure generated by adjusting the hydraulic pressure generated by the oil pump is supplied, a driving force source stopping unit that stops the rotation of the driving force source, and a hydraulic pressure reduction suppressing unit that is provided in the line pressure oil passage and suppresses a reduction of the line pressure accompanying reverse rotation of the driving force source when the rotation of the driving force source is stopped by the driving force source stopping unit.

Abstract: A powertrain for a machine may include a flywheel and a drivetrain having multiple configurations to permit the flywheel to be mechanically connected both upstream and downstream of a transmission. A bypass clutch may be used to selectively couple the flywheel directly to the engine, while a flywheel clutch may be used to selectively couple the flywheel directly to a lower powertrain. In both upsteam and downstream modes of operation, the transmission is bypassed to increase flywheel energy storage and use, as well as expanding the functionality of the flywheel.

Abstract: A method for transferring brake fluid into a wheel brake cylinder of a brake system of a vehicle includes: controlling a switchover valve, via which a brake circuit having the wheel brake cylinder is connected to a main brake cylinder, into a closed state; subsequently reducing a booster force of a brake force booster, which is exerted upon an adjustable piston of the main brake cylinder; controlling a high-pressure switchover valve to a partially opened state after the reduction of the booster force of the brake force booster; and sucking in brake fluid via the partially opened, high-pressure switchover valve and pumping the brake fluid into the at least one wheel brake cylinder.

Abstract: In a hydraulic circuit for a vehicle including an electric pump power steering system (EHPS), a hydraulic pressure supply system including a cylinder to store a second hydraulic pressure while a vehicle is traveling and supply the stored second hydraulic pressure to a clutch circuit as a third hydraulic pressure when being supplied with hydraulic pressure after storing the second hydraulic pressure. The hydraulic circuit also includes a connecting path to connect, at the start of the vehicle, the cylinder and the EHPS system to allow a first hydraulic pressure to be supplied to the cylinder by drive of a motor. It is therefore possible to reduce electric power consumed during idling stop mode and shorten a recovery time from the idling stop mode.

Abstract: Systems and methods for efficiently operating a hydraulically actuated device/system are described herein. For example, systems and methods for efficiently operating a gas compression and expansion energy storage system are disclosed herein. Systems and methods are provided for controlling and operating the hydraulic actuators used within a hydraulically actuated device/system, such as, for example, a gas compression and/or expansion energy system, within a desired efficiency range of the hydraulic pump(s)/motor(s) used to supply or receive pressurized hydraulic fluid to or from the hydraulic actuators. In such a system, a variety of different operating regimes can be used depending on the desired output gas pressure and the desired stored pressure of the compressed gas. Hydraulic cylinders used to drive working pistons within the system can be selectively actuated to achieve varying force outputs to incrementally increase the gas pressure within the system for a given cycle.

Abstract: The invention relates to a method for operating a preferably serial hydraulic hybrid drive system (1), comprising an internal combustion engine (8), a first expulsion machine (11), a second expulsion machine (12), a pressure accumulator (20) and an isolating valve device (30). For the purpose of optimization it is proposed that for various operating modes in each case a total efficiency level is read out from characteristic maps. These total efficiency levels are compared with one another. The operating mode with the best total efficiency level is subsequently selected.

Abstract: A ride control system and method where the system includes first hydraulics for equalizing pressure between ride control accumulators and boom cylinder head side, and second hydraulics for providing low pressure drop connection between ride control accumulators and boom cylinder head side. When ride control is engaged, the first hydraulics equalizes pressure between ride control accumulators and boom cylinder head side to within a pressure threshold, then the second hydraulics provides the low pressure drop connection between ride control accumulators and boom cylinder head side. Ride control system can include third hydraulics for providing fluid connection between boom cylinder rod side and tank; where after first hydraulics equalizes pressure to within pressure threshold, then third hydraulics provides connection between boom cylinder rod side and tank. The ride control system can also monitor the condition of the ride control accumulators.

Abstract: A slewing-type working machine includes: an electric storage device capable of being charged with regenerative electric power for regenerating slewing energy of an upper slewing body while functioning as an electric power source for an electric slewing motor; an electric storage device and electric storage device controller detecting whether the electric storage device is under a normal condition with sufficient capacity to regenerate the slewing energy or under an abnormal condition without sufficient capacity; and a controller controlling a velocity of the electric slewing motor based on a result of detection by the electric storage device and electric storage device controller, wherein the controller performs a velocity limiting control for limiting a maximum velocity of the electric slewing motor when the electric storage device is under the abnormal condition.

Abstract: The present invention relates to a system for adding energy comprising a plurality of pedaling devices wherein each pedaling device being configured: to receive a force in up and down directions and allow for the flow of compressed air from the corresponding pedaling device to an air storage tank, wherein connection of the air storage tank to the pedaling devices allows storing of the compressed air and the summing of the energy generated by each pedaling device. Each pedaling device comprises, a plurality of air compression cylinders and pistons for generating air pressure; wherein the pistons are provided with an escapement device.

Abstract: Disclosed herein are an apparatus and a method for supplying a fuel to an engine of a ship. The apparatus for supplying a fuel to an engine of a ship includes: a high pressure pump pressurizing a liquefied natural gas (LNG) and supplying the pressurized LNG to the engine; a hydraulic motor driving the high pressure pump; and a lubricating pump supplying lubricating oil to the high pressure pump.

Abstract: A hybrid system, consisting of an internal combustion engine (1) with added-on and/or integrated hydraulic pumps (2) to supply consumers (5) and/or the drive unit (12), at least one engine control unit (3) for electronic engine regulation and/or fuel-injection regulation, at least one hydraulic control unit (4) to control at least one hydraulic consumer (5), at least one pressure sustaining valve (6), at least one reversing valve (7) and at least one hydraulic pressure accumulator (8).

Abstract: The invention is an accumulator system in which multiple elastomeric accumulators are attached in series or parallel in order to generate total differential pressure in excess of that generated in a non-series system. Also disclosed is a “stacked” accumulator system. The system stores energy when the accumulators deform from their original shape in response to the flow of a pressurized fluid. The stored energy is available for use when the fluid is released from the accumulators and the accumulators return to their original shape.

Abstract: A rotational machine such as a turbocompressor has a fluid recovery system for recovering leaked working fluid such as gaseous helium in a helium circuit which has leaked past a shaft seal, a purifier being provided for removing contaminants from the working fluid, and turbocompressor may have one fluid such as helium or hydrogen working through one turbo component such as a turbine thereof and a second working fluid such as air or helium working through a second turbo component such as a compressor thereof, the rotational machine being installable in an engine of a flying machine.

Abstract: An apparatus can include a pressure vessel that defines an interior region that can contain a liquid and/or a gas. A piston is movably disposed within the interior region of the pressure vessel. A divider is fixedly disposed within the interior region of the pressure vessel and divides the interior region into a first interior region on a first side of the divider and a second interior region on a second, opposite side of the divider. The piston is movable between a first position in which fluid having a first pressure is disposed within the first interior region and the first interior region has a volume less than a volume of the second interior region, and a second position in which fluid having a second pressure is disposed within the second interior region and the second interior region has a volume less than a volume of the first interior region.

Abstract: A hydraulic drive system for driving a load includes a drive shaft; first and second hydraulic pumps driven by the drive shaft, and a control system that operates the hydraulic drive system in a plurality of modes including: a) a first mode where the second hydraulic pump pumps hydraulic fluid from a supply line to an accumulator; b) a second mode where the second hydraulic pump pumps hydraulic fluid from the accumulator to the supply line; c) a third mode where the second hydraulic pump pumps hydraulic fluid from the supply line to a reservoir; and d) a fourth mode where the second hydraulic pump pumps hydraulic fluid from the reservoir to the supply line. At least the second hydraulic pump is a variable displacement bidirectional pump.

Abstract: A temperature compensated accumulator and method for use thereof downhole in a well. The accumulator may include a housing with separate bulkhead and piston assemblies. Thus, one assembly may include a hydraulic fluid chamber separated from a gas precharge pressure chamber by a piston and the other assembly may include an ambient pressure chamber separated from an atmospheric chamber by another piston. Additionally a pressure relief and check valve assembly may be located at a pressure relief chamber between the other assembly sections. Thus, venting to or from the gas precharge pressure chamber may take place upon exposure to a predetermined decreased or elevated temperature so as to maintain a substantially constant precharge level for the accumulator, for example, in spite of dramatic changes in downhole temperatures.

Abstract: Hydraulic transmission apparatus including a pressurized fluid source and at least one hydraulic motor fed by said pressurized fluid source. The motor has two motor ducts for feed/discharge, and one casing duct. The motor can be operated in assisted mode, in which it generates torque or in unassisted mode in which it does not generate any torque and its pistons are maintained in the retracted position under the effect of the pressure in the casing duct. The apparatus further includes an accumulator suitable for feeding: the motor ducts during a stage of passing from the unassisted mode to the assisted mode in order to facilitate deployment of the pistons; and the casing duct during a stage of passing from the assisted mode to the unassisted mode in order to facilitate retraction of the pistons. This apparatus thus enables the motor to be positively clutched/declutched quickly.

Abstract: An apparatus has a tank with an open top, a tank wall, and a closed bottom. A first ringwall extends from the bottom such that a first annular space is defined by the first ringwall and the tank wall, and a second annular space is defined by the first ringwall. A second ringwall extends in the second annular space and defines a third annular space between the first ringwall and the second ringwall and further defines a cylindrical space. A conduit extends into the cylindrical space. A pod disposed into the cylindrical space has a closed chamber and a displacement chamber. An inner riser disposed in the third annular space has an open bottom, and an outer riser is disposed in the first annular space and has a closed top, a wall, and an open bottom.

Abstract: A hydraulic motor that can be operated in both directions, the hydraulic motor comprising two two-way hydraulic ports each of which can be connected, selectively depending on the direction of rotation in which the motor is to be actuated, either to a source of pressurized liquid or to a device for collecting the liquid at a lower pressure, the hydraulic motor comprising a drain port communicating with an interior space of the motor case, which comprises: an intermediate pipe into which the drain pipe of the case opens, a first non-return valve positioned between the intermediate pipe and a first two-way hydraulic port and able to open toward the first two-way hydraulic port; and a second non-return valve positioned between the intermediate pipe and a second two-way hydraulic port and able to open toward the second two-way hydraulic port.

Abstract: A hydraulic actuator includes an energy recuperation device which harvests the energy generated from the stroking of a shock absorber. The energy recuperation device can function in a passive energy recovery mode for the shock absorber or an active mode for the shock absorber. The energy that is generated by the energy recuperation device can be stored as fluid pressure or it can be converted to another form of energy such as electrical energy.

Abstract: A hydraulic system for a machine is disclosed. The system includes an actuator configured to move a portion of the machine, a pump configured to supply pressurized fluid to the actuator, an accumulator fluidly coupled to the actuator, a valve arrangement configured to selectively direct the fluid discharged from the actuator to the accumulator for storage and to selectively direct the stored fluid from the accumulator to the actuator, and a controller. The controller is configured to determine an accumulator pressure, an actuator pressure, and an operational parameter associated with an implement system. Further, the controller is configured to determine an accumulator control mode. The controller determines an accumulator pressure leakage rate when the accumulator control mode is neutral.

Abstract: A hydraulic arrangement for supplying a consumer or actuator includes a first supply device that has at least one pump with an adjustable delivery volume. The hydraulic arrangement further includes a second supply device that is connected in parallel to the first supply device. The second supply device includes a loadable accumulator and a digitally regulated switching valve arrangement.

Abstract: An apparatus and method for providing a controllable supply of fluid, and optionally power and/or communication signals, to a subsea equipment are provided. The fluid may be a water-based fluid, oil-based fluid, or chemicals. The apparatus includes a reservoir disposed on a seabed for storing a supply of fluid for delivery to the subsea well equipment. A subsea pumping device is configured to receive the fluid from the reservoir, pressurize the fluid, and deliver the pressurized fluid to an accumulator of a hydraulic power unit disposed on the seabed. The hydraulic power unit can store the pressurized fluid and control an output of the pressurized fluid to the subsea well equipment, thereby providing a subsea fluid source for the subsea equipment.

Abstract: A hydraulic hybrid safety system with an over-center bent-axis rotary pump/motor, a yoke and a calibrated orifice. The yoke has a zero yoke angle and a plurality of non-zero yoke angles. In addition, the pump/motor has zero torque when the yoke angle is at the zero yoke angle and non-zero torque when the yoke is at a non-zero yoke angle. The system also has at least one accumulator and at least one hydraulic line. The at least one accumulator is configured to provide hydraulic pressure and rotate the yoke via the at least one hydraulic line. The calibrated orifice is located within the at least one hydraulic line and limits the rotational speed of the yoke to a predetermined maximum value.