Abstract:
Circuit hydraulique ouvert comprenant une pompe principale (P), un moteur hydraulique (M), deux conduites principales d'alimentation et d'échappement (10, 12) reliées à la pompe ou à un réservoir (R) par un sélecteur d'alimentation (14). Le circuit comprend un dispositif de valve multifonction comprenant un sélecteur multifonction (20) pour relier la conduite principale à la plus haute pression à un limiteur de pression (24) et la conduite principale à la plus basse pression à des moyens de gavage (16) et pour relier les conduites principales entre elles en les raccordant au limiteur de pression lorsque la pression dans ces conduites principales est sensiblement égale.
Abstract:
The invention relates to a hydroelectric pressure intensifier in which the plunger piston (8) and/or the driving spindle (9) of said plunger piston and/or the piston rod (3) of the working piston (2) are driven by electrical means, especially electromotors such as linear motors (11).
Abstract:
A device for mutually independent control of regulating devices (1-6) for controlling fluid flow between a hydrocarbon reservoir (50) and a well (51) comprises a flow controller (54) and a hydraulic actuator (56). The actuator (56) is flow-relatedly arranged in series with at least two associated control valves (20-25) in a path (18, 19) between two hydraulic pipes (11, 14). The control valves (20, 25) are controlled to open for the flow of hydraulic liquid to the actuator (56) by the pressure in the two hydraulic pipes (11, 14), and the combination of two hydraulic pipes (11, 14) which are connected to an actuator (56) is different for independently controllable regulating devices (1-6).
Abstract:
A combine hydraulic damper and truck positioner mechanism (20) for a landing gear (22) of an airplane. The landing gear being swingingly attached to the airplane for reciprocating movement of the landing gear between an extended position and a retracted position. The landing gear including an elongate main strut (24) having one end swingingly attached to the airplane and a longitudinally spaced second end (36). The landing gear futher including a truck beam assembly (26) pivotally attached to the strut second end. The truck beam assembly having at least two wheels (30) journaled thereto. The combined damper and truck positioner mechanism including a housing (60) having one end (68) adapted to be fastened to the strut. The housing having an interior bore (66) with a predetermined cross-sectional area. The combined damper and truck positioner mechanism further including a piston (64) having a first piston head end (90) and a longitudinally spaced second end (112) adapted to be fastened to the truck beam assembly. The piston head being slidably received within the bore for sliding movement of the piston in response to pivoting movement of the truck beam assembly when the piston second end is attached to the truck beam assembly. The combined damper and truck positioner mechanism also including a damping assembly (54) in fluid communication with the housing. The damping assembly maintaining a substantially constant fluid pressure withint the housing to dampen loads associated with the sliding movement of the piston when the landing gear is in the extended position.
Abstract:
A system and method for controlling a damping system. The system has at least two dampers for damping between sprung (207) and unsprung masses (202, 204, 206) in the compression and rebound directions. Sensors generate signals based on position (224) and other parameters of motion representative of the displacement between the sprung and unsprung masses. The process determines the appropriate compression and rebound forces to be applied at the wheels (202). A regulator responds to at least one of the independent compression and rebound control signals for adjusting, respectively, at least one of compression and rebound resisting forces of the dampers between the masses. Compliance for the dampers is emulated with software to produce the desired compliance forces. The distributed controller includes a processor that is responsive to signals representative of the position signals for forming the compression and rebound control signals for the regulator as a function of motion between the masses or a motion of a vehicle in which the dampers are located. The system has the capability of locking the suspension when parked.
Abstract:
A device for mutually independent control of regulating devices (1-6) for controlling fluid flow between a hydrocarbon reservoir (50) and a well (51) comprises a flow controller (54) and a hydraulic actuator (56). The actuator (56) is flow-relatedly arranged in series with at least two associated control valves (20-25) in a path (18, 19) between two hydraulic pipes (11, 14). The control valves (20, 25) are controlled to open for the flow of hydraulic liquid to the actuator (56) by the pressure in the two hydraulic pipes (11, 14), and the combination of two hydraulic pipes (11, 14) which are connected to an actuator (56) is different for independently controllable regulating devices (1-6).
Abstract:
The hydraulic controlling device proposed has a differentially acting cylinder (11), the annular space (14) in the cylinder being acted on continuously by pressure produced by a pump (16). The pressure space (18) in front of the piston large area is connected to the pump by a connection line (41). Branching off from this connection line (41) is a side line (19) leading to a control valve (21). The other side of this control valve is connected to a return line (26). Appropriate control of the control valve enables the pressures in the side line (19) and hence in the pressure spaces (14, 18) of the differentially acting cylinder to be varied.
Abstract:
A hydropneumatic actuator applicable to linear actuations, comprising arrangements the purpose of which is to create internally and regeneratively a hydraulic pressure from the movement of the movable parts. These arrangements make it possible to slow the movement by finely adjusting its speed when this is required for the usage. The actuator comprises an annular pneumatic piston (Pp) provided with a movable tube (21) crimped in the internal bore of the piston, the pneumatic piston (Pp) being able to be moved in an external cylinder (Cy) under the effect of a pressure differential applied to the exterior by pneumatic connections (X1, X2). The actuator is further provided with a coaxial hydraulic piston (Ph) provided with a rod (10) sliding in a fixed coaxial lining (19, 20) separating the two pistons which remain attached to each other by a mechanical connection (1 1) between the end of the rod (10) of the hydraulic piston and the end of the movable tube (21). The actuator further includes electrical or pneumatic control valves, adjustable chokes, non-return valves, and an oil reservoir (15) kept under pressure by a spring (16) adjustable by a screw (1). The reservoir can be connected through valves, adjustable chokes and non-return valves to both sides of the hydraulic piston (Ph).
Abstract:
Disclosed is an oil pressure or air pressure type pressure-intensifying cylinder that includes a pilot valve provided to pass through first and second operation chambers in which an operation piston and a pressure intensifying piston are slidably mounted disposed in the front and rear sides of a cylinder body, the pilot valve being switched by the air pressure difference or the oil pressure difference in the chambers, and a check valve provided in the second operation chamber driving the pressure intensifying piston, whereby when the cylinder is driven in forward direction with low load, the check valve and the pilot valve are all closed but only the operation piston is advanced.