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8146481 Actuator, actuator control method, and actuator control program  
An actuator in which overshooting has been reduced is provided. A cylinder is divided by a piston to provide first and second chambers, and first and second control valves 41, 43, which adjust...
8146482 Hydraulic circuit having holding valve of external pilot pressure operation type  
A hydraulic circuit having a holding valve of an external pilot pressure operation type is provided, which can make a double check valve, which is installed to prevent an actuator from being...
8146356 Procedure to align working equipment mounted to a liftable and lowerable hoisting frame of a working machine  
The procedure, provides a simple and retro-fittable manner to align working equipment, mounted to a liftable and lowerable hoisting frame of a working machine in a tilting way to comply with...
8137078 Axial piston machine  
An axial piston machine, especially an air-conditioning compressor for motor vehicles, including a power unit which is rotatably driven by a shaft and in which the rotary movement is converted,...
8136644 Arrangement, device and method at a disturbance-eliminating valve for damper  
An electronically-controlled damper arrangement includes a valve assembly. The valve assembly features a valve slide that carries at least two pistons. The first piston controls flow through two...
8136441 Hydraulic machine, in particular hydraulic motor, with a reciprocating movement, and differential piston for such a machine  
Hydraulic machine, in particular hydraulic motor, comprising a casing, a differential piston (4) having a region of large cross section and a region of smaller cross section, which can slide with...
8136634 Piston arrangement  
A piston arrangement is disclosed for metering valves, flow-rate sensors or hydraulic motors. The piston arrangement comprises a housing, at least one recess in the housing, and a first piston...
8132497 Hydraulic machine, in particular hydraulic motor, and metering device comprising such a motor  
A hydraulic machine includes a casing with a body and a cover; a separation member which can make a reciprocating movement and defines two chambers; hydraulic switching elements including a...
8133036 Fluid powered motor  
A low pressure fluid powered motor or pump comprises a non-rotatable cover (k); an undulating lobe cam track (e) attached to the cover (k) and defining multiple crests and troughs; a rotatable...
8132868 Hydraulic regenerative braking system for a vehicle  
A hydraulic regenerative braking system and method for a vehicle include a variable displacement hydraulic machine operable as a pump or a motor (22). The hydraulic machine facilitates connections...
8128380 Axial piston pump or motor of the swashplate or bent axis type  
An axial piston machine, in particular an axial piston pump, of the swashplate or bent axis type, is described, wherein a fixed control plate (12), which comprises at least one control passage...
8127659 Compressible fluid pressure actuator driving mechanism and control apparatus thereof  
Fluid pressures of a plurality of compressible fluid pressure actuators that drive a joint through antagonistic driving are controlled by a main-fluid pressure control device, and at the time of...
8122718 Systems and methods for combined thermal and compressed gas energy conversion systems  
The invention relates to systems and methods including an energy conversion system for storage and recovery of energy using compressed gas, a source of recovered thermal energy, and a...
8122906 Pressure driven apparatus for sequential control of a cementing head  
A pressure-driven apparatus sequential controls a multiphase operation, e.g., of a cementing head. A transmission arm including a pawl is supported on a cam shaft connected to a pawl cylinder...
8122714 Variable hydraulic motor driving device  
A hydraulic motor 11 is switched to a high-speed mode when pressure oil is supplied to a pressure chamber 23 of a tilt piston 17 based on the transmission of a speed signal to a high-low speed...
8118058 Variable frequency and amplitude dither for electronically controlled valves  
A method is disclosed that includes allowing both frequency and amplitude of a periodic waveform to be adjusted. The method also includes creating the periodic waveform having the frequency and...
8117934 Transmission shift mechanism with single-end actuation  
A shift mechanism for a transmission having a first and a second combination of gears is disclosed. The shift mechanism has a rod member and a hydraulic actuator operatively connected to an end of...
8117842 Systems and methods for compressed-gas energy storage using coupled cylinder assemblies  
In various embodiments, a pneumatic cylinder assembly is coupled to a mechanism that converts motion of a piston into electricity, and vice versa, during expansion or compression of a gas in the...
8117959 Swash plate type compressor  
A swash plate includes a boss, which is mounted on the drive shaft, and a plate portion, which extends from the boss to be inclined with respect to the drive shaft. A rotary valve includes a...
8118256 Brake shutoff valve test  
A system, apparatus and method of verifying operation of a vehicle fluid brake system shutoff valve is provided, wherein the shutoff valve is adapted to enable or inhibit the transmission of fluid...
8109198 Hydraulic control apparatus  
A hydraulic control apparatus 1 includes a switch valve 11, a valve support chamber 35, a flow control valve 12 movable within the valve support chamber 35, an on-off valve 13 movable within the...
8109197 Hydraulic control system and method  
A control system for controlling the movement of a system such as a hydraulic servo controlled gimbal systems. The system includes a plurality of actuators and sensors that sense the position of...
8109085 Energy storage and generation systems and methods using coupled cylinder assemblies  
In various embodiments, pneumatic cylinder assemblies are coupled in series pneumatically, thereby reducing a range of force produced by or acting on the pneumatic cylinder assemblies during...
8100046 Procedure for the loading of a working cylinder, control module for it, working cylinder and utilization of the same  
The invention demonstrates how energy saving working cylinders are loaded with fluid under pressure in order, for example, to power devices for tensioning (toggle joint tensioning apparatus),...
8100145 LIFD valve assembly  
An LIFD valve assembly has a pressure balance device a pressure balance slide of which is urged in the opening direction by a pressure downstream of a metering aperture and in the closing...
8100045 Hydraulic cylinder rod position sensor  
A fluid pressure cylinder assembly has a sensor to provide a signal indicating the amount of extension of a piston rod from the cylinder. The sensor includes a sleeve that is fixed relative to a...
8096228 Bent axis dual yoke hydromodule  
A bent axis hydromodule that has a yoke that is rotatable about trunnions and rotating kits having rotating kit shafts that are in fluid communication with the yoke. Servo piston porting is...
8096787 Straight-line piston fluid engine with wobble drive valve actuation  
An axial piston fluid engine having single-acting cylinders incorporating swivel-joint attachment of the cylinders to rotary control valves wherein straight-line piston movement is established for...
8096227 Hydraulic system having regeneration modulation  
A hydraulic system for a machine is disclosed. The hydraulic system may have an actuator with a first chamber and a second chamber. The hydraulic system may also have a first valve, a second...
8091355 Flow compensated restrictive orifice for overrunning load protection  
A hydraulic circuit for an actuator that has a piston and piston rod that will move a load in a first direction, and which can be externally loaded in an opposite direction, includes a flow...
8092191 Control system for reciprocating device  
A control system for a reciprocating device which includes a switching valve for directing fluid supply under pressure to one of two drive lines in an alternating manner, means for alternating the...
8091467 Hydraulic valve circuit with damage-control override  
Hydraulic valve circuits capable of variably limiting respective maximum hydraulic pressures at which an assembly of bidirectional hydraulic power devices can move respective clamping members,...
8091577 Valve  
A valve seat 20 is arranged between the supply circuit 8 and a downstream circuit 18. A valve body 21 blocks a fluid flow between the supply circuit 8 and the downstream circuit 18 by contacting...
8087903 Hydraulic rotary machine  
In a hydraulic rotary machine having rotational shaft provided within a casing a rotational shaft, a cylinder block rotationally interlocked with the rotational shaft and formed with a plural...
8087345 Positive displacement injection pump  
A reciprocating drive mechanism having a housing with upper and lower internal chambers with a spool slidably positioned inside the upper internal chamber. There is at least one fluid inlet and...
8082838 Air spring pneumatic product rejection system  
A double-acting cylinder and piston mechanism comprising a cylinder (1) substantially closed at both ends by front (5) and rear (7) end walls, a piston (8) axially displaceable within the cylinder...
8082837 Control system for reciprocating device  
A control system for a reciprocating device includes a switching valve, a toggle for operating the valve, a trigger associated with the reciprocating device to actuate the toggle, and biasing...
8079831 Submersible pump having a two-step control hydraulic valve  
A submersible pump includes a pump valve configured to switch the pump between first and second states in which a piston is respectively extended and retracted. The pump valve includes first and...
8079298 Compact hydraulic mechanism with radial pistons  
A hydraulic mechanism including a cylinder block having radial pistons and mounted to rotate in a stationary casing, and a distribution cover that forms a portion of the casing that has feed and...
8074557 Electrohydraulic booster  
An electrohydraulic booster comprises an electromechanical transducer and a hydromechanical power stage which is connected to a pressurized medium supply and encompasses a cylinder and a piston...
8069772 Systems and methods for controlling hydraulic actuators  
Methods and systems for controlling a hydraulic motor are described. By way of illustration, a motor control system has a first input configured to receive a step/direction command signal. A...
8069928 Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device  
A percussive device and method having, inside a machine housing (3), a reciprocally moveable percussive piston (2), the movement of which is controlled by a control valve (5), which is arranged to...
8066491 Reciprocating pump with electronically monitored air valve having battery and solenoid electronic monitoring  
An air operated pump (10) uses a magnet (14) mounted in the valve cup (16) of the air motor (18) and two reed sensors (20) mounted in the valve cover (22) to monitor the speed and position of the...
8065930 Hydraulic actuator for transmissions having reduced noise  
The present invention provides a three position hydraulic piston assembly for a gear ratio change mechanism for a transmission exhibiting reduced gear shift noise. The three position hydraulic...
8066474 Variable guide vane actuator  
A variable guide vane actuator for positioning the guide vanes of a turbine engine in a hypersonic missile uses compressor exhaust to drive a linked, floating piston assembly that is coupled to...
8061959 Board inverter  
The present invention relates to a board inverter and a boarding inverting system. The board inverter includes a support, a first board picking device, an second board picking device and a...
8061261 Antagonistic fluid control system for active and passive actuator operation  
An antagonistic fluid control system, wherein the system may comprise multiple antagonistic pressure control valves operable with a single actuator, or multiple pressure control valves operable...
8065037 Control method and system for hydraulic machines employing a dynamic joint motion model  
A control method and system for controlling a hydraulically actuated mechanical arm to perform a task, the mechanical arm optionally being a hydraulically actuated excavator arm. The method can...
8061262 Pneumatic stepper motor  
A stepper motor suitable for use in a medical imaging environment has (a) a cylindrical central gear having an external surface with circumferentially distributed and radially directed teeth, (b)...
8056465 Active implement down force system providing reduced heat generation  
A line connects the tractor hydraulic power beyond supply to the pressure reduction valve that is connected to the implement cylinder ends and automatically controls implement down pressure. Fluid...