Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8176734 | Hydrostatic transmission having proportional pressure variable displacement pump for loop charge and fan flow supply A hydrostatic transmission having a hydraulic pump that is fluidly connected to a hydraulic motor. The transmission also has a pressure control valve that has first and second stages and is fluidly connected to the hydraulic pump. By utilizing the pressure control v... | 05/15/2012 |
| 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 units being adjustable together with a pivotable dual yoke or by means ... | 04/17/2012 |
| 8142170 | Radial piston pump A radial piston pump having external loading. The radial piston pump has an inner eccentric which is attached to a rotatable driveshaft, a cylinder block which has positionally fixed cylinder bores aligned radially with respect to the driveshaft, and displacement pi... | 03/27/2012 |
| 8122783 | Joystick and method of manufacturing the same A joystick having a movable member that includes a shaft portion and a spherical portion wherein the shaft portion has a diameter less than the spherical portion. An actuating member is secured to the shaft portion of the movable member to provide actuation of the m... | 02/28/2012 |
| 8117837 | Hydrostatic transmission having integrated pressure compensated load sensing auxiliary pump A hydrostatic transmission using a hydrostatic pump, a hydrostatic motor, and a pressure compensating load sensing auxiliary pump. The hydrostatic pump is fluidly connected to the hydrostatic motor using fluid lines and a center section. The hydrostatic pump additio... | 02/21/2012 |
| 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 integrated within the yoke and positioned about the trunnion such that servo... | 01/17/2012 |
| 8080888 | Hydraulic generator drive system A hydraulic generator drive system. The drive system has a control system that utilizes a first loop control that receives a signal associated with hydraulic pump or motor output and sends a command signal to a pump controller in order to control the hydraulic pump.... | 12/20/2011 |
| 8001776 | Hydraulic circuit arrangement with a device for limiting control and method for pressure control by controlling displacement The invention relates to a hydraulic circuit arrangement for setting the delivery volume of a pump, with an electrically activatable control-valve unit, by means of which, alternately, an active side of a servo system can be acted upon with pressure and, at the same... | 08/23/2011 |
| 7987035 | Method of operating a vehicle and apparatus comprising the same An engine management system and a method of operating the same within a vehicle. The system uses a plurality of software modules one of which communicates with the vehicle engine to communicate information and additionally communicates with at least one other softwa... | 07/26/2011 |
| 7966924 | Non-linear feedback in a dual yoke hydromodule A variable displacement bent axis unit comprising a housing and a yoke pivotally disposed therein wherein the yoke has a cam member attached thereto. A control mechanism that changes the displacement of the unit has a control valve disposed therein that engages the ... | 06/28/2011 |
| 7806040 | Ball supported swashplate for axial piston hydraulic machine An axial piston hydraulic machine having a housing with a cylinder block with reciprocating pistons disposed therein. The reciprocating pistons are rotatably connected to a swashplate at a first end of the swashplate. At a second end of a swashplate support balls ar... | 10/05/2010 |
| 7757579 | Joystick device with redundant sensor processing A joystick device having a grip assembly pivotably connected to a base assembly. The base assembly having sensing elements that detect the movement of the grip assembly as it pivots about the base assembly. Disposed within the base assembly and the sensing elements ... | 07/20/2010 |
| 7730826 | Swashplate type axial piston device having apparatus for providing three operating displacements An axial piston hydraulic device. The device has a housing that uses a servo piston in order to control the displacement of a swashplate within the device. By using a servo member disposed within a cavity of an end cap on the housing the axial piston hydraulic devic... | 06/08/2010 |
| 7730722 | Low power HMT with by-pass valve A method of operating a vehicle with a hydrostatic circuit. The method includes providing a hydrostatic circuit having first and second hydraulic kits that are fluidly connected to one another by first and second fluid lines. A by-pass valve is placed between the fi... | 06/08/2010 |
| 7717245 | Self-actuating clutch A hydromechanical transmission having a self actuating clutch assembly. The self-actuating clutch assembly comprises a first and second gear clutching elements and a shaft clutching element that engages a shaft. The shaft clutching element is a cone clutch that is a... | 05/18/2010 |
| 7716821 | Method of manufacturing a circuit board assembly for a controller A method of manufacturing a circuit board assembly for a controller. The method includes providing first and second printed circuit boards wherein the first printed circuit board has a plurality of copper pads containing slots therein that correspond to a plurality ... | 05/18/2010 |
| 7594868 | Split-power transmission with mode shift An operating system for a vehicle having an engine that provides an input shaft into a split-power transmission to actuate an output shaft that drives an axle and wheels of the vehicle. The split-power transmission uses a power summing device in order to provide a p... | 09/29/2009 |
| 7594377 | Means of adjusting ground speed of a vehicle based on load on blade assembly An assembly having a frame supported by a plurality of ground engaging wheels. Mounted to the frame is an operator control system that is connected to a controller that is powered by an electrical source. The controller is operatively connected to a blade assembly a... | 09/29/2009 |
| 7578362 | Vehicles with dual path hydromechanical transmissions A vehicle having a frame with an engine mounted thereon. The engine has an output shaft that is connected to the input shaft of at least one hydromechanical transmission with a drive belt. A second hydromechanical transmission can then be used in association with th... | 08/25/2009 |
| 7578193 | Method of measuring vibration on a device A method of measuring vibration on an operational device. The method includes providing an operational device with a control unit and a vibration sensor having a three axis accelerometer, a digital signal processor, and a communications transceiver. The digital sign... | 08/25/2009 |
| 7456828 | Joystick device A joystick device is provided that is in electronic communication with a remotely located main electronic controller used to control heavy machinery and the like. The joystick device includes a base assembly having a first microprocessor in electronic communication ... | 11/25/2008 |
| D579878 | Microcontroller enclosure housing | 11/04/2008 |
| D579877 | Microcontroller enclosure housing | 11/04/2008 |
| 7440821 | Method of determining average current in a PWM drive A method of yielding the average current in a PWM driven coil for an electrohydraulic valve. The method includes transmitting a feedback signal into a Finite Impulse Response filter to take multiple signal samples in order to calculate and average value of current w... | 10/21/2008 |
| 7438800 | Arrangement for filtering hydraulic fluid An arrangement for filtering a hydraulic fluid having a bypass line connecting the feed channel to the discharge channel where the bypass line is opened by a pressure switching valve when a pressure change is caused by the contamination of the filter element. ... | 10/21/2008 |
| 7380492 | Hydrostatic variable displacement unit having a swash plate and a servo system having a spring arrangement A hydrostatic variable displacement unit is provided having a swash plate which serves to adjust the stroke of displacement pistons in a cylinder block and can be pivoted in its angular position by means of a servo system, the servo system having at least one servo ... | 06/03/2008 |
| 7377353 | Four wheel traction control valve system A hydrostatic propulsion system includes a hydrostatic circuit fluidly connecting left front and right front motors in parallel with an outlet of a pump, left rear and right rear motors in parallel with an inlet of the pump, left front motor and right rear motor in ... | 05/27/2008 |
| 7377354 | Four wheel traction control valve system A hydrostatic propulsion system includes a hydrostatic circuit fluidly connecting left front and right front motors in parallel with an outlet of a pump, left rear and right rear motors in parallel with an inlet of the pump, left front motor and right rear motor in ... | 05/27/2008 |
| 7353745 | Hydrostatic adjustment unit with swashplate, rotating cylinder block and a rotational speed signal transmitter A hydrostatic adjustment unit with a swash plate for adjusting the stroke of displacer pistons which are arranged in a rotating cylinder block is described. The displacer pistons each have a slider block which bears against a support face of the swash plate and is h... | 04/08/2008 |
| 7354368 | Method and means for shifting a hydromechanical transmission A method for achieving high quality shifts with one hydraulic unit near zero displacement when using dog clutches. This method includes selecting the proper displacement and vocation (whether the hydrostatic unit works as a pump or motor) of a low displacement hydra... | 04/08/2008 |
| 7317290 | Tandem battery powered inverter and method of implementing the same AC inverters that are electrically connected to a direct current source to convert the direct current source such that the transistor power module of an inverter can power a plurality of AC motors wherein the motors can be located remote from the inverters or within... | 01/08/2008 |
| 7316115 | Means and method for controlling a hydromechanical transmission in dual mode A system for operating a hydromechanical transmission having a movable input member that transmits a signal to a control unit that uses predefined logic to determine if a hydrostatic transmission should be in a first low speed mode that uses displacement control or ... | 01/08/2008 |
| 7316112 | Method of creating feedback control in a closed hydrostatic circuit and a control system therefore An improved rotary spool control system for a closed hydrostatic circuit and method to use the same. The control spool utilizes metering of the spool notches and specifically the metering of the servo drain notch wherein the drain notch is of irregular cross section... | 01/08/2008 |
| 7300260 | Special fluids for use in a hydrostatic transmission A positive displacement piston unit is provided that utilizes a magnetorheological (MR) or electrorheological (ER) fluid as the transmission fluid. Each cylinder of the invention has an intake port connected to the suction port of the hydrostatic pump and an output ... | 11/27/2007 |
| 7299738 | Axial piston machine having a device for the electrically proportional adjustment of the volumetric displacement An axial piston machine having a swashplate or an oblique axis which can be adjusted by means of servopistons and has a valve segment and an adjustment unit for the electrically proportional adjustment of the volumetric displacement. The adjustment unit comprises pr... | 11/27/2007 |
| 7299629 | Charge/auxiliary circuit for reducing power losses in hydrostatic systems A charge pump is provided with two independent outlets that can satisfy the pressure requirements of both a charge circuit and an auxiliary circuit. Preferably, the charge pump is a multiple roller vane pump that has at least one inlet and two outlets independent of... | 11/27/2007 |
| D553571 | Microcontroller enclosure housing | 10/23/2007 |
| 7283900 | Work vehicle steering system with flow-metering curve selection and associated method A steering system for a work vehicle adjusts the steering ratio in response to changes in the speed of the work vehicle. ... | 10/16/2007 |
| 7231825 | Accelerometer based tilt sensor and method for using same A tilt sensor and a method for the use of the tilt sensor to calculate the degree of tilt, whereby the tilt sensor has at least three accelerometers mounted to a base, the accelerometers are positioned in a common plane, and wherein each is preferably at an equally ... | 06/19/2007 |
| 7201183 | Valve arrangement in a hydraulic circuit, use of the same and arrangement for controlling a hydraulic vehicle drive A valve arrangement in a hydraulic circuit comprises a longitudinal duct 3 and a transverse duct 2. A throttle slide 10 can be displaced in the direction of the longitudinal duct 3. Arranged in the throttle slide 10 is a valve pist... | 04/10/2007 |
