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7634911 Energy recovery system  
An energy recovery system for a machine is disclosed. The energy recovery system may have a pump configured to provide a flow of pressurized fluid. The energy recovery system may also have a first...
7614224 Hydraulic system for industrial vehicle  
A hydraulic circuit of a hybrid type industrial vehicle drivable by an engine and an electric motor is disclosed. A generator motor is driven by the engine and generates electricity. A cargo...
7565801 Swing drive device and work machine  
A swing control circuit is provided separately from a hydraulic actuator control circuit. The swing control circuit includes a swing pump motor connected to closed circuits of a swing motor through...
7516613 Hydraulic drive system  
A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of...
7472546 Regenerative braking system for a work machine  
A regenerative braking system for a work machine includes a ground driven hydraulic pump coupled to a drive system, the ground driven hydraulic pump being configured to absorb shaft power from the...
7444809 Hydraulic regeneration system  
A hydraulic system for a work machine is provided. The hydraulic regeneration system has a tank, a primary source, a first actuator, an accumulator, and a first valve mechanism. The tank is...
7441406 Fluid circuit and industrial truck having a fluid circuit  
The invention relates to a fluid circuit for load displacement, having a fluid supply line for conveying fluid from a fluid tank by means of a fluid pump to at least one fluid store of a consumer,...
7434391 Excavator and a machine for material transfer  
The invention relates to an excavator or to a machine for material transfer comprising an element movable via at least one hydraulic cylinder. In accordance with the invention, one or more...
7409826 Compact hydrostatic energy recuperation system and method of operation  
A compact hydrostatic energy recuperation system comprises hydrostatic converter with first and second pump-motors, which shafts fastened by coupling. The first pump-motor having greater...
7401464 Energy regeneration system for machines  
First and second displacement variable regenerating hydraulic motors are provided in third and fourth flow rate control lines which function as discharge flow paths for oil discharged,...
7387182 Turbine generator regenerative braking system  
A turbine generator regenerative braking system may be used to slow or stop a rotating shaft or wheel, wherein energy may be recovered as electricity generated by a turbine generator and stored in...
7374005 Opposing pump/motors  
Two motors are arranged on opposing sides of a common shaft, drive plates of the pump/motors being rigidly coupled to each other, for example by being in hard contact with opposing sides of the...
7325398 Closed circuit energy recovery system for a work implement  
A closed circuit hydraulic system includes a fluid reservoir, a hydraulic cylinder having a cylinder rod, a bidirectional variable displacement hydraulic pump that pumps fluid to either extend or...
7296407 Hydraulic service module  
A hydraulic service module is provided for a hydraulic fluid system, which includes a fluid reservoir for storing an appropriate amount of a hydraulic fluid. The hydraulic service module comprises...
7290389 Hydraulic drive system and improved filter sub-system therefor  
A hydraulic drive system ( 11 ) of the type including a hydrostatic pump-motor unit ( 35 ) having a pumping mode in which the unit pressurizes, from its port (A), a high pressure accumulator ( 41...
7269944 Hydraulic system for recovering potential energy  
A hydraulic system may include a hydraulic actuator. The hydraulic system may also include a pump having a pump inlet and a pump outlet, and the pump may be configured to supply fluid to the...
7263828 Fluid machine  
An expansion-and-compressor device of a fluid machine has a pump mode operation in which the expansion-and-compressor device is rotated by a driving force from a driving source to compress working...
7249457 Hydraulic gravitational load energy recuperation  
A hydraulic system has gravitional load energy recuperation by opening a recuperation piloted valve with a pilot pressure supplied by a hydraulic pump so as to drive a recuperation hydraulic motor...
7234298 Hybrid hydraulic system and work machine using same  
A hydraulic system and work machine are provided, the hydraulic system including at least one hydraulic cylinder with a first port and a second port connected by a first fluid passage. A first...
7232192 Deadband regenerative braking control for hydraulic hybrid vehicle powertrain  
A system for braking the wheels of a hydraulic hybrid vehicle includes a brake pedal having a range of pedal displacement including a deadband displacement range, an accumulator containing fluid at...
7201095 Vehicle system to recapture kinetic energy  
A fluid drive system that can be used to drive a vehicle and has energy regeneration and storage capabilities. The fluid drive system includes an electrical energy supply source mounted on the...
7197871 Power system and work machine using same  
Engineers are constantly seeking methods to reduce undesirable emissions, noise, and vibrations created by power systems. In the present invention, a power system includes at least one hydraulic...
7181910 Hydraulic lifting device for battery-operated industrial trucks  
Hydraulic lifting device for battery-operated industrial trucks, with at least one hydraulic lifting cylinder, a hydraulic pump working as a pump in the load lifting operation mode, supplying the...
7162869 Hydraulic system for a work machine  
A hydraulic system for a work machine is disclosed. The hydraulic system includes a tank adapted to store a supply of fluid and a source of pressurized fluid in fluid communication with the tank. A...
7147239 Wheel creep control of hydraulic hybrid vehicle using regenerative braking  
A system according to this invention opposes creep in a hydraulic hybrid motor vehicle. An accumulator contains fluid at high pressure, and a reservoir contains fluid at lower pressure. An engine...
7124576 Hydraulic energy intensifier  
Hydraulic circuits used to manipulate tools in, for example construction equipment, uses less power for a retraction of a hydraulic cylinder than for an extension of that cylinder. Provided is a...
7107767 Hydraulic energy storage systems  
A hydraulic energy storage system for vehicles to provide higher efficiency, smaller package size, lower weight, unitary construction, durability and enhanced reliability while maintaining the...
7086226 Construction machine  
In order to provide a construction machine by which energy regeneration can be performed reliably and battery and electrical power generator can be miniaturized, a construction machine has an...
7082757 Pump/motor operating mode switching control for hydraulic hybrid vehicle  
A system for transmitting power hydraulically to and from the wheels of a motor vehicle includes an accumulator containing fluid at relatively high pressure, a reservoir containing fluid at lower...
7076946 Hydraulic kicker control piston  
A pump-motor unit ( 35 ) including a swashplate ( 95 ) having a neutral position (FIG. 3 ) and first and second displaced positions and comprising first ( 87 ) and second ( 89 ) pressure actuators...
7028934 Vertical roller mill with improved hydro-pneumatic loading system  
An accumulator assembly comprising at least two accumulators that are hydraulically interconnected to the same source of hydraulic fluid. Each accumulator containing an energy absorbing medium...
7007465 Mobile handling device  
The present invention relates to a mobile handling device with a hydraulic circuit, which hydraulic circuit (L) comprises a lifting cylinder ( 1 ) arranged in a lifting device ( 100 ) suitable for...
6973780 Controller for a hydraulic press and method for the operation thereof  
The invention relates to a controller for a hydraulic press, comprising a pressing cylinder ( 1 ), a reservoir ( 2 ), a valve group ( 3 ), a pressure medium reservoir ( 7 ) and a hydraulic pump ( 6...
6973782 Pressurized hydraulic fluid system with remote charge pump  
A pressurized hydraulic fluid system includes a charge pump, a hydraulic motor drivingly coupled to the charge pump, and a main hydraulic unit adapted to function as a pump to drive the hydraulic...
6971232 Hydraulic drive system and improved control valve assembly therefor  
A control valve assembly ( 43 ) for use in a system in which a pump-motor unit ( 35 ) can either receive drive torque from a drive-line ( 17 ) or transmit torque thereto. The system includes a high...
6962050 Hybrid machine with hydraulic drive device  
A hybrid machine with a hydraulic drive device having hydraulic actuators allowed to operate against and by external loads is provided. To this end, the hybrid machine comprises hydraulic cylinders...
6938414 Hydraulic powered arm system with float control  
The present invention relates to a hydraulically powered arm system with a hydraulic circuit, which hydraulic circuit (L) comprises a pressure source ( 6 ) and a lifting cylinder ( 1 ) arranged to...
6922989 Plural pressure oil energies selective recovery apparatus and selective recovery method therefor  
It is an object of the present invention to provide a plural pressure oil energies selective recovery apparatus which can selectively recover pressure oil energies stored in plural pressure oil...
6922990 Device arrangement structure for hybrid construction equipment  
A device arrangement structure for hybrid construction equipment capable of reducing devices of a charging system in size is provided. For this purpose, in the device arrangement structure: a...
6918247 Assisted hydraulic system for moving a structural member  
A system is provided having a hydraulic circuit configured to move one structural member relative to another, and an assist cylinder connected between the structural members and configured to...
6854268 Hydraulic control system with energy recovery  
A fluid control system may include a pump, a tank, and an actuator. A valve assembly may be configured to control fluid communication between the actuator, the tank, and the pump. An energy...
6848253 Control method at truck  
Method to control the lowering movement of the lifting cylinder or cylinders ( 1, 2 ) of a truck. When a lowering is to take place the pump ( 5 ) is started in the pumping direction for increasing...
6834737 Hybrid vehicle and energy storage system and method  
A system for providing a hybrid vehicle with a practical source of auxiliary power. The system includes two electric motor/generators connected to each other in such a fashion so that when one...
6789387 System for recovering energy in hydraulic circuit  
A method is provided for recovering energy in a hydraulic circuit. The hydraulic circuit includes a pump having a swashplate and being in fluid communication with a hydraulic actuator via a valve....
6739127 Hydraulic system pump charging and recirculation apparatus  
An apparatus for charging a hydraulic system from a fluid reservoir includes a pump having an inlet and an outlet, a first conduit fluidly connected to the pump inlet and fluidly connectable to the...
6725581 Construction equipment  
Compact, low-cost construction equipment capable of effectively recovering energy from a plurality of hydraulic actuators is provided. To this end, the construction equipment comprises: a hydraulic...
6719080 Hydraulic hybrid vehicle  
An automotive powertrain includes a hydraulic drive circuit including at least one of: (1) a hydraulic pump/motor having a shaft fixed to for rotation with the crankshaft of an internal combustion...
6666022 Drive device of working machine  
A drive apparatus comprises an engine, a hydraulic pump, an electric motor concurrently serving as a generator, a battery, a first control device that charges the battery with the electric power...
6655136 System and method for accumulating hydraulic fluid  
A hydraulic system is provided. The hydraulic system includes a a hydraulic actuator, a source of pressurized fluid, and a directional control valve controlling fluid flow into and out of the...
6652239 Motor controller for a hydraulic pump with electrical regeneration  
Disclosure is made of a precision hydraulic energy delivery system that directly couples the pump to a primary mover (motor) and a related motor control. The system provides flow control of a...
Matches 1 - 50 out of 171 1 2 3 4 >