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8176995 |
Reduced-impact sliding pressure control valve for pneumatic hammer drill
A method and means of minimizing the effect of elastic valve recoil in impact applications, such as percussive drilling, where sliding spool valves used inside the percussive device are subject to...
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8176838 |
Hydraulic machine arrangement
A hydraulic machine arrangement includes at least one hydraulic machine having a plurality of pistons reciprocating within corresponding cylinders. The pistons can be driven by a cam to operate the...
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8167586 |
Valve assembly with low resistance pilot shifting
A valve arrangement for placing a supply of motive fluid in alternating communication with first and second motive fluid chambers. The valve arrangement includes a power valve including a supply...
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8166915 |
Device for removing at least one teat cup from a teat of an animal
A device for removing at least one teat cup (1a) from a teat of an animal includes i) a cylinder (2) provided with a movable piston (3) dividing an inner space of the cylinder in a first...
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8166865 |
Brake boost sensor feeler
A sensor feeler device for a brake booster. The sensor feeler device (4) includes an axially moveable cylinder (40), the movement of which can be controlled by the control rod which is itself...
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8167580 |
Axial piston machine with hydrostatic support of the holding-down device
An axial piston machine is provided. A housing of the machine receives an eccentric disk and a rotatably mounted cylinder drum. The drum has cylinders and pistons. The pistons are reciprocatable in...
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8162632 |
Fluid pump
A pump is disclosed, having a pumping chamber in the rotor. The rotor is rotatable between first, second, third and fourth positions. When the rotor is in the first position, an inlet cam assembly...
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8161741 |
System and methods for optimizing efficiency of a hydraulically actuated system
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...
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8156738 |
Hydrostatic transmission having two axial piston units
The invention relates to a hydrostatic transmission having two bent axis- or swashplate-type axial piston units which are operated alternately as a pump and as a motor, with the two axial piston...
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8151688 |
Hydraulic circuit of construction machine
A throttle path for returning a part of pilot oil to a tank is formed by a tank path provided in a valve block of a control valve and a notch provided in a spool thereof. The above path is opened...
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8151900 |
Percussion equipment driven by a pressurized incompressible fluid
A percussion apparatus driven by a pressurized incompressible fluid includes a body with two coaxial bores for slidably mounting of a tool, and separately slidably mounting a striking piston having...
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8152483 |
Variable capacity compressor
The variable capacity compressor has a rotor 21, as a rotating member, fixed to a drive shaft 10 and rotating integrally with the drive shaft 10, a swash plate 24, as a tilting member, tiltably and...
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8152477 |
Electrokinetic pump designs and drug delivery systems
One embodiment of the present invention provides a piston assembly having a piston housing filled with an electrolyte; a housing within the piston housing that divides the piston housing into a...
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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...
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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...
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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 pushed...
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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, via...
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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...
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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 a...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 heat-exchange...
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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...
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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...
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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...
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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 the...
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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...
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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...
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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...
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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...
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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...
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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...
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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),...
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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 direction...
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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 valve,...
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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...
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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...
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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...
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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...
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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, such...
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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...
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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...
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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...
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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...
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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 means...
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