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| Number | Title | Issue Date |
| 8042333 | Oil cooling circuit for continuously reciprocating hydraulic cylinders An oil cooling and filtering circuit connecting a reciprocating fluid power hydraulic cylinder to a reversible hydraulic pump or hydraulic directional valve. The circuit consists preferably of a three-way, three-position valve and a purge relief valve, which functio... | 10/25/2011 |
| 8033106 | Electrohydraulic transmission controller, transmission device, and a motor vehicle drive train An electrohydraulic transmission controller (7), a transmission device with an electrohydraulic transmission controller and a vehicle drive train that features an electrohydraulic transmission controller are disclosed. The electrohydraulic transmission contro... | 10/11/2011 |
| 7992385 | Hydraulic control device A hydraulic control device includes an oil pan; an oil pump; a strainer; a pressure regulating valve; an oil cooler; a cooler bypass valve with an input port that is connected with a cooler supply oil passage through which the hydraulic oil to be supplied to the oil... | 08/09/2011 |
| 7954317 | Hydraulic system A hydraulic system for an agricultural vehicle is proposed. The hydraulic system comprises a main hydraulic circuit, which is fed with hydraulic fluid by a main hydraulic pump, a variable displacement charge pump which supplies charge pressure to the main hydraulic ... | 06/07/2011 |
| 7937938 | Hydraulic reversing fan valve and machine using same A machine includes a hydraulic fan system for circulating cooling air through an engine compartment. Periodically, the fan rotation direction is briefly reversed in order to dislodge any material debris that may have accumulated at the inlet to the engine compartmen... | 05/10/2011 |
| 7856819 | Hydraulic circuit for a public works vehicle and vehicle comprising one such circuit The invention relates to a hydraulic circuit (20) for public works vehicles. The circuit comprises: a pump (21) which is driven by a heat engine (22) using a load sensing technique; a hydraulic motor (10) which is used to move one part of... | 12/28/2010 |
| 7849688 | Method and apparatus for retarding an engine A method and system for retarding an engine of a machine is provided. The machine has a hydraulic pump driven by the engine, a motor driven by the hydraulic pump, and a fan driven by the motor. The method includes sensing the operating speed of the engine with an en... | 12/14/2010 |
| 7845170 | Drive wheel with an integral fan for a hydraulic power unit A drive wheel with an integral fan mountable as a unit to a shaft of a hydraulic power unit for rotation therewith. Fan blades extending from the drive wheel circulate air when the drive wheel is rotated. One or more passageways extending through the drive wheel can... | 12/07/2010 |
| 7690197 | Hydraulic fluid cooling apparatus and method A hydraulic drive apparatus comprises a main pump for pumping hydraulic fluid through a hydraulic load, a charge pump for continuously pumping pressurized hydraulic fluid to the main pump, and a hydraulic fluid cooler. At least a portion to the hydraulic fluid pumpe... | 04/06/2010 |
| 7685816 | Cooling system for construction machine A cooling system for a construction machine, which can reduce noise of a cooling fan and can reliably produce cooling air at a required flow rate. The cooling system comprises a cooling fan 25 for producing cooling air introduced to an intercooler 2... | 03/30/2010 |
| 7654083 | Axle driving apparatus for a zero turn radius vehicle An axle driving apparatus includes a first housing having a plurality of cooling fins, an axle rotatably mounted in the first housing, a hydraulic stepless speed change assembly disposed within the first housing. The axle driving apparatus also includes a second hou... | 02/02/2010 |
| 7631496 | Hydraulic unit with integral oil cooler A hydraulic unit including an integrated fluid cooler. The fluid cooler includes a flow-through type heat exchanger. The hydraulic unit can include a pump, a motor, or both a pump and a motor. The fluid cooler can be carried by a housing of the hydraulic unit and a ... | 12/15/2009 |
| 7559198 | Cooling device for the hydraulic fluid of a site machine hydrostatic drive A cooling device for the hydraulic fluid of a site machine hydrostatic drive comprises a pump body and a rotor with vanes, keyed directly on a driving shaft which drives the pump, and driven in rotation in a way designed to send a flow of cooling air onto the pump b... | 07/14/2009 |
| 7421840 | Energy conversion and dissipation system A hydraulic energy conversion and dissipation system comprises a hydraulic retarder pump driven by a source of a mechanical energy needed to be dissipated for converting the mechanical energy into a waste hydraulic energy, a hydraulic flow retarder provided for conv... | 09/09/2008 |
| 7409827 | Working vehicle There is provided a working vehicle including: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump case accommodating the hydraulic pump main body and having an inner space capable of storing oil; a hyd... | 08/12/2008 |
| 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 |
| 7331760 | Fan revolution speed control method Actual temperatures of intake air, hydraulic oil, and coolant, to be cooled by a cooling fan, are detected. Target fan revolution speeds are determined by PI control units based on differences between the actual temperatures and target temperatures. The cooling fan ... | 02/19/2008 |
| 7328575 | Method and device for the pneumatic operation of a tool A device for the pneumatic operation of a tool includes a generally closed pressure fluid circuit (2), at least one compressor (5), for increasing the pressure of the pressure fluid in the circuit, the compressor (5) having an inlet and an outle... | 02/12/2008 |
| 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 an outer casing defining an enclosure therewithin including an air ch... | 11/20/2007 |
| 7284471 | Pressure control valve having intrinsic mechanical feedback system A method and system for controlling the dynamics of an actuatable load functioning or operable within a servo or servo-type system, wherein the dynamics of the load are controlled by way of a unique pressure control valve configured to provide intrinsic pressure reg... | 10/23/2007 |
| 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 |
| 7278261 | Pump apparatus An end cap adaptable for use with either a dual hydraulic pump unit having two pumps in a side-by-side arrangement or a pair of separate hydraulic pumps having separate housings. The internal structure of the end cap is arranged in such a manner to permit the separa... | 10/09/2007 |
| 7275368 | Fan revolution speed control method The invention is a fan revolution control method for controlling a pump-motor system, by controlling the fan revolution speed of a cooling fan adapted to be rotated by a fan motor to cool cooling target fluids. The pump-motor system drives the fan motor by a hydraul... | 10/02/2007 |
| 7269946 | HST drive circuit The present invention makes it possible, in an HST drive circuit wherein an HST pump and an HST motor have been separately stored in a pump case and a motor case, to efficiently cool the HST drive circuit. A cooling line for, while discharging a relief oil from a ch... | 09/18/2007 |
| 7240486 | Electro-hydraulic system for fan driving and brake charging An electro-hydraulic system for a machine may include a brake charging system including at least one accumulator. A fan drive system may include a fan and a fan motor. A fluid source may be in communication with the brake charging system and the fan drive system. Th... | 07/10/2007 |
| 7232518 | Filter device A filter device includes at least one filter unit (10), connectable to a hydraulic circuit (14), with at least one supply line (16), one discharge line (18), and at least one cooling unit (22). The cooling unit is connected to a se... | 06/19/2007 |
| 7222485 | Hydrostatic continuously variable transmission A hydrostatic continuously variable transmission comprises: a hydraulic pump; a power input shaft engaged with the hydraulic pump to transmit power from a power source to the hydraulic pump; a hydraulic motor in hydraulic communication with the hydraulic pump; a cas... | 05/29/2007 |
| 7220204 | Hydrostatic transaxle apparatus A hydrostatic transaxle apparatus comprises a housing in which an HST, a pair of axles, a differential unit differentially connecting the axles to each other, and a horizontal counter shaft interposed between the HST and the differential unit. The HST comprises axia... | 05/22/2007 |
| 7207173 | Method and apparatus for warm up control of autonomous inverter-driven hydraulic unit An apparatus for warm up control of an autonomous inverter-driven hydraulic unit has a warm up control section and a switch section. The warm up control section performs a predetermined process using a current speed and current pressure as input information and outp... | 04/24/2007 |
| 7191595 | Lubrication device Method and arrangement for providing a device for delivering lubricant (10a, 10b) to at least one lubrication point (17) and which includes a reservoir (9) for lubricant (10a, 10b) connected to th... | 03/20/2007 |
| 7185939 | Hydraulic drive system for vehicle roofs The invention relates to a hydraulic drive system used for the covers of vehicle openings, in particular for vehicle roofs with a construction that can be opened. In said system, the actuator that is designed to displace the cover is supplied with a bulk current, wh... | 03/06/2007 |
| 7178426 | Enhanced lubrication system for drive axle assemblies An improved lubrication system for drive axle assemblies is provided that uses a collector in connection with a filter plug to lower the dynamic lubricant level in the drive axle assembly and filter contaminants in the lubricant sump. The collector is affixed to a c... | 02/20/2007 |
| 7142967 | Features of main control computer for a power machine The present invention is directed to a computer based control system for controlling hydraulic and electromechanical actuators on a power machine, such as a skid steer loader. The computer based control system is configured to implement a number of features to enhan... | 11/28/2006 |
| 7121091 | Pump unit The present invention provides a pump unit including at least one hydraulic pump with inlet and outlet ports, a pump case for accommodating the hydraulic pump having an opening through which the hydraulic pump is insertable, and a lid, called a center section, closi... | 10/17/2006 |
| 7121970 | Control system for a hydro-mechanical transmission A variable relief valve is inserted in a hydraulic piping for connecting a first pump/motor to a second pump/motor. The variable relief valve is controlled such that when shifting the transmission from forward to reverse or vice versa, a relief set pressure of the v... | 10/17/2006 |
| 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 capability to efficiently store and restore energy at high power levels. | 09/19/2006 |
| 7086241 | Hydraulic power unit for a refrigeration system A hydraulic power unit for a refrigeration system. According to one aspect of the invention, the power unit is provided for driving the refrigeration system of a truck having an engine for propelling the truck and a power take off from the engine. The refrigeration ... | 08/08/2006 |
| 7082759 | Hydraulic drive vehicle A hydraulic driving vehicle comprises front and rear transaxles incorporating respective hydraulic motors, and a pump unit separated from the front and rear transaxles. The pump unit incorporates a hydraulic pump having a pump shaft. A hydraulic circuit is formed by... | 08/01/2006 |
| 7052429 | Internal expansion tank for hydrostatic transaxle An expansion chamber for a hydrostatic transaxle to provide for expansion of the hydraulic oil during operation of the transaxle, where the expansion chamber is formed as part of the housing inside the main sump by ribs or other members extending from the housing an... | 05/30/2006 |
| 7028472 | Pump unit The present invention provides a pump unit including at least one hydraulic pump with inlet and outlet ports, a pump case for accommodating the hydraulic pump having an opening through which the hydraulic pump is insertable, and a lid, called a center section, closi... | 04/18/2006 |
