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| Number | Title | Issue Date |
| 8051651 | Hydraulic flow control system A hydraulic system for use in a work vehicle with a powered implement is disclosed. In one embodiment, the hydraulic system may include a first hydraulic circuit including a first hydraulic pump with a low pressure and low flow output, switch and valve; a second hyd... | 11/08/2011 |
| 8046991 | System for selectively routing transmission fluid to a torque converter A torque converter coupled to a transmission has a torque converter operating mode and a lockup operating mode. A first pump may be configured to supply transmission fluid to a plurality of electro-hydraulic transmission components. A second pump may be configured t... | 11/01/2011 |
| 7621123 | Actuator control system and method Actuator control system and method comprising an electric motor driving a hydraulic pump in fluid delivery communication with a source of hydraulic fluid; a variable speed controller operatively coupled to the motor for driving the pump at variable speeds; an extern... | 11/24/2009 |
| 7610754 | Fluid pressure unit and fluid pressure unit control method In a hydraulic unit (A) including a hydraulic pump configured to be driven by a motor (2) and a hydraulic cylinder (3) for actuating a chuck, a fixed displacement hydraulic pump is combined with an adjustable speed motor (2) for driving the pump... | 11/03/2009 |
| 7481053 | Hydraulic pressurizer system A hydraulic pressurizer system comprises a drive source, which drives a hybrid vehicle, a mechanical oil pump, which is driven by the drive source, an electrical motor, which is activated by a 12V battery, an electrical oil pump, which is driven by the electrical mo... | 01/27/2009 |
| 7469534 | Load control structure for work vehicle A load control structure for a work vehicle comprises: a device for detecting operating position of a manually operated speed change operating element; an engine load detection device for detecting load on an engine of the work vehicle; a swash plate position detect... | 12/30/2008 |
| 7412827 | Multi-pump control system and method A hydraulic control system for a work machine is disclosed. The hydraulic control system has a first pump, a second pump, an operator control device, and a controller. The first and second pumps are configured to pressurize a fluid. The operator control device is mo... | 08/19/2008 |
| 7360357 | Hydraulic steering system with input horsepower limiting circuit and increased fan speeds at low engine RPM A hydraulic system that provides hydraulic fluid to a power steering system of a vehicle at a substantially constant flow rate and can also divert excess hydraulic fluid to the air cooling fan of an associated vehicle at low engine speeds is disclosed. The resulting... | 04/22/2008 |
| 7316111 | Multi-purpose hydraulic system A hydraulic system including a first pump, a second pump, an auxiliary passage, and a supplemental apparatus. The first pump is in fluid communication with a first valve, and the second pump is in fluid communication with a second valve. The auxiliary passage is in ... | 01/08/2008 |
| 7281370 | Fan revolution speed control method Temperature of each cooling target fluid is detected. When the flow rate of a cooling target fluid passing through a cooling system is high, the fan revolution speed of a cooling fan of the cooling system is controlled to achieve a target fan revolution speed so tha... | 10/16/2007 |
| 7272928 | Hydraulic circuit of construction machinery To keep one of three hydraulic pumps unaffected by variations in torque of the remaining hydraulic pumps when the three hydraulic pumps are used, displacements of the first and second hydraulic pumps are controlled based on their own delivery pressures P1,P | 09/25/2007 |
| 7260931 | Multi-actuator pressure-based flow control system A hydraulic control system for a work machine is disclosed. The hydraulic control system has a fluid actuator, a supply of pressurized fluid, and a control valve movable to selectively pass pressurized fluid to the fluid actuator. The hydraulic control system also h... | 08/28/2007 |
| 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 with a source of fluid pressurized by gravity from the load. The recu... | 07/31/2007 |
| 7204087 | Hydraulic tool A hydraulic tool has a motor, a valve, a hydraulic intensifier, and a supply connector. The hydraulic intensifier is arranged between the valve and the motor. The valve and the motor are arranged behind one another in a longitudinal direction of the tool. The hydrau... | 04/17/2007 |
| 7189046 | Transport for swap body A transport (1) or an associated trailer (2) with a loadable swap body (3, 4) having a support frame and support legs (5) attached to the frame and moveable between a resting position and a support position wherein that the swap body (... | 03/13/2007 |
| 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 first hydraulic actuator and a second hydraulic actuator are in flui... | 01/16/2007 |
| 7155908 | Hydraulic system for heavy equipment option apparatus The present invention is directed to controlling an operation oil supplied to an option apparatus without changing a design of a control valve assembly which controls an operation oil supplied to a traveling motor, etc. when additionally engaging an option apparatus... | 01/02/2007 |
| 7130721 | Electrohydraulic control system Consistent with an aspect of the disclosure, a method for controlling a hydraulic cylinder is provided. The hydraulic cylinder is provided with a chamber and configured to receive fluid from a valve. The method includes receiving a user input and determining a desir... | 10/31/2006 |
| 7127887 | Oil pressure circuit for working machines A joining directional control valve 13 is disposed to supply, to an arm cylinder 4, not only a hydraulic fluid delivered from a first hydraulic pump 1, but also a hydraulic fluid delivered from a second hydraulic pump 2 when an arm direct... | 10/31/2006 |
| 7121266 | Fuel pump cutoff shuttle valve A fuel pump cutoff shuttle valve is located between a multiple fuel pump arrangement. The valve has a first tubular member with a hollow, biased sliding member inside that moves according to the fuel pressures of the pumps. The fuel that flows through the valve memb... | 10/17/2006 |
| 7107766 | Hydraulic pressurization system The present invention relates to a hydraulic pressurization system, in particular for application to pressurization devices operating in accordance with the high hydrostatic pressure principle. In particular, the present invention provides a pressurization system fo... | 09/19/2006 |
| 7093383 | Automatic hydraulic load leveling system for a work vehicle A machine has a boom, that is pivotally raised and lowered by a first cylinder, and has a load carrier that is pivoted at the end of the boom by a second cylinder. As a machine operator commands movement of the boom, the position of the load carrier is automatically... | 08/22/2006 |
| 7089734 | Hydraulic system for wheeled loader An hydraulic system for a wheeled loader comprising a loader arm assembly which carries a working implement and which is connected to the body and which is movable between raised and lowered positions by means of a hydraulic ram means and in which a hydraulic accumu... | 08/15/2006 |
| 7069722 | Hydraulic system for a vehicle, a vehicle including such a hydraulic system and a suplementary unit for such a vehicle A hydraulic system for a vehicle has a hydraulic, load carrying assembly which has a movable structural element and a hydraulic device for actuating the structural element. The hydraulic system has a primary circuit having a servo device, a stationary hydraulic pump... | 07/04/2006 |
| 6997098 | Method and apparatus for driving hydraulic motors with agricultural tractors For connection to a hydraulic power supply of a tractor, wherein the tractor comprises a plurality of hydraulic supply circuits, and wherein each hydraulic supply circuit comprises a pair of quick couplers for connecting the hydraulic supply circuit to a hydraulic d... | 02/14/2006 |
| 6990807 | Auxiliary hydraulic drive system One preferred embodiment of the present invention, provides an auxiliary hydraulic drive system having a total hydraulic flow. The system includes a primary hydraulic pump operable to provide hydraulic flow for an implement, and a flow control valve in communication... | 01/31/2006 |
| 6959241 | Engine control device An engine control device capable of improving engine efficiency by operating the engine in an area where fuel consumption is small (good) while allowing high responsivity of the engine to be maintained. The object can be achieved by operating to match at a point on ... | 10/25/2005 |
| 6932583 | Multiple stage pump with multiple external control valves A multiple stage pump having valves downstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations. The multiple stage pump includes a first pump in a first stage ... | 08/23/2005 |
| 6931846 | Equalizing flow from pressure compensated pumps, with or without load sensing, in a multiple pump circuit A rotary flow combiner allows flow from multiple pressure compensated hydraulic pumps; with or without load sensing to be combined into a single outlet. The flows are combined in such a way that each input to the rotary flow combiner has equal flow. The flow from ea... | 08/23/2005 |
| 6763863 | Hydraulic circuits for tree-harvesting knuckle booms A hydraulic valve is used to judiciously shunt oil from lowering ends of the hoist and stick cylinders that have been plumbed to achieve near horizontal movement. This allows the use of cylinders that have unequal rod/bore ratios or to compensate for certain transie... | 07/20/2004 |
| 6732512 | Velocity based electronic control system for operating hydraulic equipment A control system for operating a hydraulic system includes a user input device which generates an input signal indicating desired movement of a hydraulic actuator. A mapping routine converts the input signal into a velocity command indicating desired actuator veloci... | 05/11/2004 |
| 6708490 | Hydraulic system for construction machine According to the invention, traveling bypass cut-off valves are disposed in center bypass passages respectively which are located between traveling direction control valves and working direction control valves disposed downstream of the valves, wherein, when at leas... | 03/23/2004 |
| 6681818 | Hydraulic circuits for tree-harvesting knuckle booms The two boom members and hydraulic cylinders of a knuckle boom tree harvesting machine are so arranged and proportioned that with a single control movement during reaching and retracting actions the working tool head is made to travel in an approximately ... | 01/27/2004 |
| 6658972 | Full force web severer A first given pressure is provided to a first side of an air pressure cylinder that in turn drives a cutting member under the influence of the first given pressure. A second given pressure is provided to a second side of the air pressure cylinder that is ... | 12/09/2003 |
| 6498973 | Flow control for electro-hydraulic systems In a work vehicle that has several hydraulic actuators a system and method for controlling and scaling flow between the actuators includes an electronic controller that is connected to several hand controls that provide a proportional signal indicating ho... | 12/24/2002 |
| 6477837 | Method for operating hydraulic drive apparatus A method for operating a hydraulic drive apparatus in which flows of oil discharged from a plurality of hydraulic drive sources each using a hydraulic pump are merged in order to drive an actuator. At least in a pressure control mode, one of the hydraulic... | 11/12/2002 |
| 6443196 | Hydraulic circuits for tree-harvesting knuckle booms The two boom members and hydraulic cylinders of a knuckle boom tree harvesting machine are so arranged and proportioned that with a single control movement during reaching and retracting actions the working tool head is made to travel in an approximately ... | 09/03/2002 |
| 6293765 | Tandem fixed displacement pump with torque control A tandem fixed displacement pump circuit with torque control includes first and second pumps that draw fluid from a reservoir to supply respective load circuits, pressure relief valves for each of the load circuits, and a pilot operated sequence valve tha... | 09/25/2001 |
| 6240353 | Industrial vehicle A control apparatus for an industrial vehicle is disclosed. The vehicle has a rear axle that is swingable during straight travel of the vehicle and can be fixed during turning of the vehicle. A damper looks or unlocks the rear axle. A controller has a mem... | 05/29/2001 |
| 6003313 | High pressure to low pressure exchange system for hydraulic drives A boom and drive train hydraulic system is described having a pressure source, preferably a pump operated by a motor, said pressure source providing hydraulic fluid at a high pressure to a first set of valves used to operate the drive train of the system.... | 12/21/1999 |
