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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 8033107 | Hydrostatic drive having volumetric flow equalisation A hydrostatic drive with first and second hydraulic pumps and a dual-acting hydraulic cylinder. The dual-acting hydraulic cylinder has a first working chamber defined by a first piston surface and a second working chamber defined by a second piston surface. The firs... | 10/11/2011 |
| 7971435 | Hyrdaulic transmission A hydraulic transmission comprises a hydraulic pump and a hydraulic motor, which are mounted onto a center section to be fluidly connected to each other through a closed fluid circuit formed in the center section. A neutral valve is connected to the closed fluid cir... | 07/05/2011 |
| 7926265 | Hydrostatic drive The invention relates to a hydrostatic drive. The hydrostatic drive (1) includes a hydraulic pump (3) and a hydraulic motor (7). The hydraulic pump (3) may be connected by way of a first working line (5) to a first working line con... | 04/19/2011 |
| 7874153 | Hydrostatic drive and method of braking a hydrostatic drive The invention relates to a hydrostatic drive (1) and to a method of braking a hydrostatic drive (1). In the hydrostatic drive (1), in a closed circuit a hydraulic pump (3) is connected by a first and a second working line (11, 12) ... | 01/25/2011 |
| 7707829 | Flushing system having a single charge relief valve A flushing system for a transmission is disclosed. The system has a first pump and a first actuator connected to the first pump to form a first loop. The system also has a second pump and a second actuator connected to the second pump to form a second loop. The syst... | 05/04/2010 |
| 7637102 | Hydraulic circuit having a multifunction selector An open hydraulic circuit comprising a main pump (P), a hydraulic motor (M), two main ducts (10, 12) constituting a feed main duct and a discharge main duct and connected to the pump or to a reservoir (R) via a feed selector (14). The circuit further c... | 12/29/2009 |
| 7607298 | Hydrostatic drive The invention relates to a hydrostatic drive comprising a hydraulic pump (1) and at least one hydraulic engine (3). Said hydraulic engine (3) is contacted to a closed circuit via a first working line (5) and a second working line (6 | 10/27/2009 |
| 7543449 | Hydraulic system for linear drives controlled by a displacer element The invention concerns a hydraulic system for linear drives with a differential cylinder, in particular for mobile machines which through the use of displacement-control of the drives avoids the many and diverse disadvantages of the state of the art and renders poss... | 06/09/2009 |
| 7523609 | Hydrostatic transmission There is provided a hydrostatic transmission (HST) in which a hydraulic pump unit operatively driven by a driving power source and a hydraulic motor unit arranged spaced apart from the hydraulic pump unit and operatively driving a driving-wheel are fluidly connected... | 04/28/2009 |
| 7430860 | Hydrostatic transmission circuit Improvement in a hydrostatic valve assembly for use in a hydrostatic transmission, for controlling fluid transfer between a first, second and third line, wherein two of the lines define first and second pressure lines within a closed loop circuit. The valve assembly... | 10/07/2008 |
| 7430861 | Shift controlled bypass orifice for hydrostatic transmission A shift controlled bypass orifice for a hydrostatic transmission includes a pump valve body with high pressure ports through which hydraulic fluid flows between a pump and a motor, a bypass orifice extending between the high pressure ports and the outside of the pum... | 10/07/2008 |
| 7406824 | Hydrostatic transmission circuit with replenishing for a vehicle The circuit comprises a main hydraulic pump (52), two main ducts (50, 54), a booster pump (56), a hydraulic motor (10; 20) which comprises two elementary motors (11, 12; 21, 22) for driving a first displacement member (1, 2)... | 08/05/2008 |
| 7401466 | Hydraulic drive, in particular for two-cylinder thick matter pumps The invention relates to a hydraulic drive, especially for two-cylinder thick matter pumps. Said hydraulic drive comprises at least one main pump (10) embodied as a hydraulic variable displacement pump, and two hydraulically actuatable drive cylinders (20,... | 07/22/2008 |
| 7371055 | Tandem pump unit The present invention provides a tandem pump unit that includes: a first hydraulic pump and a second hydraulic pump respectively having a first pump shaft and a second pump shaft respectively having adjacent ends connected together so that the first and second pump ... | 05/13/2008 |
| 7361000 | Tandem pump unit The present invention provides a tandem pump unit that includes: a first hydraulic pump and a second hydraulic pump respectively having a first pump shaft and a second pump shaft respectively having adjacent ends connected together so that the first and second pump ... | 04/22/2008 |
| 7320577 | Dual pump transmission A dual pump apparatus for use on a vehicle or industrial application having a housing in which a pair of hydraulic pumps are mounted, having a cooling fan mounted on the primary or secondary input shaft on the opposite side of the pulley used to engage the prime mov... | 01/22/2008 |
| 7316114 | Valve for a hydraulic drive apparatus An improved valve for use in a hydrostatic drive apparatus for a vehicle such as a zero turn vehicle. For each hydraulic drive system in the vehicle, a valve is located between the high and low pressure sides of the closed hydraulic circuit connecting the hydraulic ... | 01/08/2008 |
| 7302799 | Drive system for a vehicle The invention proposes a drive system for a vehicle, in particular for a tracked vehicle, having a drive machine and at least one load, which is mechanically coupled to an output drive of the drive machine, at least one control means being associated with the at lea... | 12/04/2007 |
| 7302798 | Hydraulic system, reservoir and pump suction enhancer for motor vehicle A hydraulic system for a motor vehicle is provided with a pump suction enhancer includes a body section defining a small chamber, a venturi tube passage exposed to the small chamber at an inner end thereof and connected to the suction port of the oil pump, and a noz... | 12/04/2007 |
| 7299891 | Hydraulic drive mechanism for mobile vehicles To make operating a hydraulic drive mechanism above its admissible maximum rotational speed without separating the mechanical connection to the drive wheel possible, the motor (1) is adjusted in displacement to almost no displacement and the pressure-medium s... | 11/27/2007 |
| 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 |
| 7231764 | Exchange and/or scavenging device for a circuit comprising at least one hydraulic motor The device comprises a replenishing valve (24) having an opening control chamber suitable for being connected to a main duct (12, 14) of the circuit, and a closing control chamber, the pressure in said chambers making it possible to cause the moving me... | 06/19/2007 |
| 7229256 | Dual pump transmission A dual pump apparatus having two pumps mounted in a housing, where the housing comprises two elements mounted on opposite sides of a hydraulic mounting member or center section. The pumps are mounted on one side of the hydraulic mounting member in a pump cavity, and... | 06/12/2007 |
| 7225617 | Bypass mechanism for a hydraulic drive apparatus A hydraulic drive apparatus having a center section located in a housing includes a hydraulic pump and motor disposed thereon and in fluid communication with a hydraulic porting system in the center section. The pump is driven by an input shaft extending out of the ... | 06/05/2007 |
| 7225618 | Axle driving system An axle driving system which houses in a housing thereof a hydrostatic transmission, axles, and a driving gear train for connecting output means of the hydraulic transmission and axles, so as to transmit power from a driving source to the hydrostatic transmission an... | 06/05/2007 |
| 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 |
| 7191594 | Hydrostatic stepless transmission A hydrostatic stepless transmission comprises a hydraulic pump and a hydraulic motor, at least one of the hydraulic pump and motor being variable in displacement; a closed circuit for fluidly connecting the hydraulic pump and motor to each other therethrough, the cl... | 03/20/2007 |
| 7185577 | Tandem pump unit The present invention provides a tandem pump unit that includes: a first hydraulic pump and a second hydraulic pump respectively having a first pump shaft and a second pump shaft respectively having adjacent ends connected together so that the first and second pump ... | 03/06/2007 |
| 7174996 | Hydraulic fluid feeder Supplying fluids different in pressure from one end of a revolving shaft without providing a diagonal hole in the revolving shaft for supply holes for feeding hydraulic fluid and lubricating oil. The time for manufacturing and the cost of providing a hydraulic fluid... | 02/13/2007 |
| 7168247 | Charge pump A charge pump for hydraulic drive device such as a hydrostatic transmission or integrated hydrostatic transaxle using hydraulic porting having high and low pressure sides mounted in a sump to connect a hydraulic pump and motor. The charge pump comprises a body conne... | 01/30/2007 |
| 7140169 | Feeder controls for a forage harvester An agricultural harvesting machine, such as a forage harvester comprises a set of feedrolls (20, 21, 26, 27) for feeding harvested crop material to a rotating cutterhead (36). The feedrolls are driven by a hydraulic drive means comprising a hydrostatic... | 11/28/2006 |
| 7133758 | Neutral start interlock A neutral start interlock for a hydrostatic drive system that uses potentiometers to electronically monitor at least the position of the hydrostatic displacement control such that the engine will not start unless such control is in the neutral position. ... | 11/07/2006 |
| 7127889 | Zero turn transaxle A hydraulic drive apparatus having a pair of hydraulic pumps and a pair of hydraulic motors mounted on a common center section in a housing is disclosed. Each hydraulic motor is engaged to an adjustable swash plate located in the transmission housing for adjusting t... | 10/31/2006 |
| 7121092 | Bypass mechanism for a hydraulic drive device A pair of zero-turn, hydrostatic transaxles (HZTs) that may be joined to form an integrated, zero-turn, hydrostatic transaxle. Each of the hydrostatic transaxles are further comprised of a casing carrying a hydraulic pump driven by an input shaft, a hydraulic motor ... | 10/17/2006 |
| 7114332 | Clutch apparatus for a hydrostatic continuously variable transmission and transmission incorporating same A hydrostatic continuously variable transmission includes a hydraulic pump and a hydraulic motor, supported by a common support shaft, and hydraulically connectable to each other through a hydraulic circuit including an inside passage and an outside passage. A clutc... | 10/03/2006 |
| 7111458 | Electrical loop flushing system A loop flushing circuit in a closed circuit hydraulic system has a variable displacement hydraulic pump that is fluidly connected to a hydraulic motor. The flushing flow in the closed circuit is controlled by an electronically proportional flow control valve. The el... | 09/26/2006 |
| 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 |
| 7089644 | Method for manufacturing transaxles A method of manufacturing a plurality of left hand control hydrostatic transaxles and a plurality of right hand controlled hydrostatic transaxles. The method includes the steps of: providing a plurality of substantially identical axle modules; providing a plurality ... | 08/15/2006 |
| RE39158 | Hydraulic system, manifold and volumetric compensator A hydraulic system manifold having a body, a counterbalancer in the body and a flow controller in the body is disclosed. The body has first and second pump ports, first and second cylinder ports, first and second compensator ports and first and second supply conduit... | 07/11/2006 |
| 7069723 | Anti-reaction valve device, and control unit and hydraulically powered system comprising anti-reaction valve device An anti-reaction valve device is configured to open such that a plunger and a sheet member move away from each other in association with first and second set difference pressures. Two anti-reaction valve devices are provided between two pipes fluidically connected t... | 07/04/2006 |
