Abstract: The hydraulic system includes a reservoir configured to store hydraulic fluid, an actuator, a first conduit coupling the reservoir to the actuator, a second conduit having a first end and a second end, a first valve positioned between the first end of the second conduit and the first conduit, a second valve positioned between the second end of the second conduit and the first conduit, and a pump configured to drive the hydraulic fluid from the reservoir to the actuator. The hydraulic fluid flows through the first conduit to the actuator when the first valve is in a first position. The hydraulic fluid flows partially through the first conduit, through the second conduit, back to the first conduit, and to the actuator when the first valve is in a second position.

Abstract: An arrangement includes a combustion-free reciprocating engine having a cylinder closed by a cylinder head and a negative pressure chamber. A piston is coupled to a crankshaft via a connecting rod. The connecting rod and the crankshaft are integrated in a crankcase of the reciprocating engine. The cylinder head has an inlet valve and an outlet valve. The vacuum chamber is connectable to a working chamber of the cylinder via the outlet valve, to generate a negative pressure in the working chamber, and to the atmosphere (A) surrounding the reciprocating engine via the inlet valve to generate ambient pressure in the working chamber. A valve control controls the intake and the exhaust valves such that the piston is moved back and forth by alternately applying ambient pressure and negative pressure There is always a substantially constant pressure, in a region of the piston facing away from the cylinder head.

Abstract: The hydrogen compression system, comprises a source of gaseous hydrogen at a first pressure, and a mixing unit, adapted to mix hydrogen and an additional gaseous component at said first pressure, the additional gaseous component having an average molecular weight higher than hydrogen. A compression unit is adapted to compress a gaseous mixture comprising hydrogen and the additional gaseous component to a second pressure. A separation unit is fluidly coupled to the compression unit and adapted to separate compressed hydrogen from compressed additional gaseous component. An energy recovery arrangement is further provided to recover energy from the expansion of the compressed additional gaseous component from the second pressure to the third pressure. Disclosed is also a method for efficient hydrogen compression.

Abstract: A seal for a cavity plate in a microwave oven is described herein. The seal includes a seal body having an outward sealing surface defined around a seal perimeter. The outward sealing surface is configured to seal against inward facing walls of a microwave oven. The seal body also includes an inward sealing surface spaced inward from the outward facing surface. The inward sealing surface is configured to seal against an outer edge of a cavity plate. The seal further includes a plurality of seal supports extending from the seal body on a cavity side of the seal body for maintaining cavity spacing between a bottom microwave oven surface and the seal body.

Abstract: A working cylinder has a cylinder tube, a closure part and a further closure part disposed at cylinder tube ends. The closure part has a shaft portion and the cylinder tube has a cylinder tube end portion. The shaft portion and the cylinder tube end portion define a coupling portion where the shaft portion is axially inserted into the cylinder tube at the cylinder tube end portion. The shaft portion has a taper and is oversized, at least in part, relative to an inner diameter of the cylinder tube. The cylinder tube has an elastic circumferential expansion there. The coupling portion is constructed to axially couple the closure part and the cylinder tube. The cylinder tube end is bonded to the closure part by a circumferential annular weld seam that defines a sealing plane.

Abstract: The disclosure relates to a mobile crane, in particular an rough terrain crane, comprising a boom mounted so as to be pivotable about a horizontal pivot axis, a hydraulic luffing cylinder by means of which the boom can be luffed up and down about the pivot axis, a hydraulic control block for controlling the luffing cylinder and a first safety valve which is connected between the control block and the luffing cylinder and is configured to seal off a load-bearing cylinder chamber of the luffing cylinder in a blocking position. According to the disclosure, the crane further comprises a second safety valve, which is connected in series between the first safety valve and the control block and is configured to seal off the load-bearing cylinder chamber of the luffing cylinder in a blocking position.

Abstract: Provided is a fluid pressure actuator in which a bamboo shoot part is formed on a free end side of the sealing member to enable engaging and retaining a cover member that is separate from the fluid pressure actuator.

Abstract: An integrated pump device forms a module in which a motor, an oil pump rotated by a driving force of the motor, and a hydraulic parking lock actuator are integrally constructed. The hydraulic parking lock actuator operates to switch between an advance state and a retard state by hydraulic pressure supplied from the oil pump, and locks a parking lock mechanism of an automobile in the advance state and unlocks the parking lock mechanism in the retard state. The oil pump can supply oil for cooling or lubrication to an oil consumer via the hydraulic parking lock actuator.

Abstract: Pneumatic soft actuators, and methods and machines capable of modifying their performance and mechanical characteristics. Such a pneumatic soft actuator can be used to connect mechanical components and include an inflatable pouch formed by an airtight, flexible, non-stretchable membrane. The inflatable pouch has oppositely-disposed ends adapted to couple to the mechanical components, and has two lateral edges in which symmetrical folds are formed and define end geometries at the ends of the inflatable pouch. Inflation and deflation of the inflatable pouch increases and decreases, respectively, a distance between the ends of the inflatable pouch to induce relative motion between the mechanical components coupled to the ends of the inflatable pouch.

Abstract: A piston assembly includes a piston head. The piston assembly further includes an upper connecting rod rotatably coupled to the piston head. The piston assembly also includes a shoe positioned between the upper connecting rod and an inner wall of the piston head.

Abstract: The control valve includes a valve body; a spool hole formed in the valve body; a spool slidably fitted in the spool hole; a pilot chamber into which a pilot fluid to actuate the spool is led; a discharge passage to discharge a hydraulic fluid to an outside of the valve body; a spiral groove to communicate with the discharge passage, the spiral groove being formed in a spiral shape on an outer periphery of the spool; and at least one axial groove to cause the pilot chamber and the spiral groove to communicate with each other, the axial groove being formed along an axial direction of the spool on an inner surface of the spool hole.

Abstract: A coupler for a reciprocating pump includes comprising two collar elements. Each collar element includes a semi annular body, an exterior channel extending on the exterior surface of the semi-annular body, and an interior channel extending along the interior surface of the semi-annular body, the interior channel having a depth and width to accommodate both an end of a liquid pump rod and an end of a reciprocating drive.

Abstract: A safety system for a machine includes a pressurizing device; at least one hydraulic cylinder, the at least one hydraulic cylinder including a pressure chamber and a piston having a head and a rod, the piston being movable within the pressure chamber along a longitudinal direction; a first pressure sensor and a second pressure sensor being designed to measure the pressure within the pressure chamber via a first channel having a first opening and a second channel having a second opening, which both extend into the pressure chamber, and are spaced apart as seen in the longitudinal direction; a seal device arranged circumferentially around the head of the piston, and a hydraulic system being fluidically connected to a head side and a rod side of the at least one hydraulic cylinder, the hydraulic system being fluidically connected to a hydraulic fluid reservoir and the pressurizing device.

Abstract: A variable impedance actuator is provided with a bladder-style actuator having a first end and a second end, and a jamming brake located inside the bladder-style actuator and connected to the first end and the second end of the bladder-style actuator. The bladder-style actuator and the jamming brake are independently controlled.

Abstract: A stability and control augmentation system (SCAS) actuator is operable for actuating a flight control surface of an aircraft. The SCAS actuator includes an actuator housing having a first aperture, a second aperture and a hydraulic chamber therebetween. A piston extends through the actuator housing. Fluid inlets are in fluid communication with regions of the hydraulic chamber. A first end portion of the piston is arranged to slide through the first aperture without a seal between the first end portion and the first aperture. A second end portion of the piston is arranged to slide through the second aperture without a seal between the second end portion and the second aperture. An intermediate portion of the piston is arranged to slide in the hydraulic chamber without a seal between the intermediate portion and the hydraulic chamber.

Abstract: A housing for a hydraulic unit, in particular a master brake cylinder for a hydraulic motor vehicle brake system, has at least a first and a second separate formed elements which are arranged on at least one side of the housing for a spatially clearly defined mounting of the housing and introduction of clamping forces into an external holding device.

Abstract: In accordance with one aspect of the present disclosure, a reservoir tank for a brake system can be provided, and the reservoir tank includes an upper body provided with an oil injector through which oil is injected, a lower body provided with a port through which oil is supplied to a master cylinder and coupled to the upper body to form an oil space, and a partition provided in the oil space to prevent the oil from being gathered at one side, wherein the partition includes a plurality of first partitions formed vertically and a second partition provided between the plurality of first partitions and provided with a communication space formed therein to communicate with the port.

Abstract: A method for actuating a fluid actuator in a motor vehicle seat system having a motor vehicle seat and a pneumatic system for actuating a seat function. The pneumatic system has a pump and the fluid actuator housed in the motor vehicle seat. The pump motor is an electric motor controlled by a PWM signal and is set up to fill the fluid actuator with fluid within a filling phase. The pneumatic system is set up to withdraw fluid from a fluid actuator filled with fluid, in an emptying phase. The fluid actuator runs through a plurality of filling phases and emptying phases in succession. The duty cycle of the PWM signal is set to a working level during a filling phase and is lowered to a lower level between filling phases. The lower level is dimensioned such that the rotor of the pump motor can still rotate.

Abstract: The present invention relates to an inflatable, moveable structure comprising: a fluid source; at least one chamber comprising a substantially inelastic outer membrane defining a cavity extending therebetween, in which the or each cavity is in fluid communication with the fluid source, and in which the or each chamber further comprises at least one first valve located on and extending through the outer membrane thereof; and a control system.

Abstract: A mobile machine such as a tractor has an engine and hydraulic supply system including a pump supply with a pump (MP) driven by the engine to provide a pressurized fluid at a pump supply pressure PSP. The hydraulic supply system has an electronic load sensing system (E-LS) to regulate the pump supply pressure. The E-LS is arranged to increase a stand-by pressure differential of the pump supply once the engine is determined to be running following start-up. This enables the hydraulic supply system to be configured with a reduced hydro-mechanically defined stand-by pressure differential so that it places a reduced load on the engine when it is started. The E-LS may be arranged to inhibit LS control of the pump supply when the engine is started, with LS functionality only commenced once the engine is running. Reduced load on the engine during start-up can improve cold starting.