| SAUER-DANFOSS INC. Patent applications |
| Patent application number | Title | Published |
|---|
| 20110283881 | CYLINDER BLOCK ASSEMBLY FOR A HYDRAULIC DEVICE - A cylinder block assembly for a hydraulic device. The cylinder block assembly includes a cylinder block with a plurality of piston bores disposed therethrough. Circumferential grooves are disposed around the piston bore such that an elastic bushing may be disposed within the piston bore using a slip fit so that when the elastic material deforms the material deforms into the circumferential groove. By deforming into the circumferential groove the elastic bushing is locked in place and axial movement of the bushing in the bore is prevented. | 11-24-2011 |
| 20110079293 | HYDRAULIC SYSTEM WITH LEAKAGE FLUID REMOVAL - Hydraulic system with a hydraulic machine, in particular an axial piston or radial piston unit, with rotating and moving machine components which are arranged in a housing. The housing is connected to a high-pressure and a low-pressure line of a working circuit, which is supplied with pressure fluid by means of a charge pump. The leakage fluid which occurs in the housing collects in a leakage fluid reservoir which is arranged below the rotating and moving hydraulic machine components in the working position of the hydraulic machine and is connected fluidically to the housing. The leakage fluid is pumped out of the leakage fluid reservoir into the low-pressure line of the working circuit by the charge pump. | 04-07-2011 |
| 20100293937 | HYDRAULIC DRIVE WITH AN INDEPENDENT CHARGE PUMP - The invention relates to a hydraulic drive ( | 11-25-2010 |
| 20100132352 | 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 valve when the first stage of the pressure control is at a minimum pressure the second stage determines the minimum charge pressure setting for the hydrostatic transmission. | 06-03-2010 |
| 20100116579 | BENT AXIS HYDROMODULE WITH BOLT ON TRUNNION BEARING CARRIERS - A bent axis hydromodule that utilizes a bearing carrier assembly between the trunnion of a yoke and the frame of the bent axis hydromodule. The bearing carrier receives the trunnion and is secured to the frame by at least one fastening element that extends axially perpendicular to the trunnion axis that causes the fastening element preload force to be in the same direction as primary loading of that joint. | 05-13-2010 |
| 20090308065 | HYDRAULIC OUTPUT DRIVE SHAFT GENERATOR - The invention relates to a mobile machine having a traction drive and working hydraulics. The drive unit has a radial piston pump which is driven by a drive set and supplies working hydraulics. The radial piston pump is arranged on the axis of the output drive shaft of the drive set, between the drive set and a gearbox which is connected thereto via the output drive shaft. The drive set, the radial piston pump and the gearbox in this case form a compact drive unit. | 12-17-2009 |
| 20090263258 | VIBRATION DAMPENING MEDIA IN HYDRAULIC POWER UNITS - A hydraulic power unit that uses a quantity of media within a cavity adjacent to and surrounding a hydraulic assembly in the housing of the hydraulic power unit to reduce the overall noise of the unit. Additionally, the cavity either seals the media from the moving parts of the hydraulic assembly or isolates the media from the moving parts of the hydraulic assembly to ensure damage to the hydraulic assembly does not result. | 10-22-2009 |
| 20090242054 | SELECTABLE DETENT ASSEMBLY WITH NEUTRAL PROTECTION - A selectable detent assembly that has a housing with a plurality of passageways. Within the housing is a selector spool that is disposed within a selector passageway and is rotatable to provide a plurality of rotational positions including a no detent position, a kick down position, and a continuous detent position. A pilot check valve is disposed within the housing and provides a fluid flow path from a pilot passageway to the selector passageway and a detent passageway. A detent arming piston is disposed within the detent passageway and is connected to a directional control valve spool. Thus, depending on the rotational position of the selector spool, the selector spool can either provide a continuous flow path through the selector passageway to a tank, a flow path that is controlled by the axial position of the selector spool or prevent flow to the tank in order to operate the detent arming piston. | 10-01-2009 |
| 20090212766 | 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 movable member. A magnet is disposed within the spherical portion of the movable member and positioned adjacent a three axis sensor such that the magnet moves in a hemispherical pattern along the three axis sensor to operate a device. | 08-27-2009 |
| 20090155095 | RADIAL PISTON PUMP - The invention relates to a radial piston pump having external loading. Said 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 pistons which are mounted in a longitudinally movable manner in the cylinder bores, with the displacement pistons having a piston head with a short casing height, and being mounted with their piston base on the eccentric, in such a way that the piston head, during its longitudinal movement, pivots in a predetermined angle range &r about the longitudinal central axis of the associated cylinder bore. | 06-18-2009 |
| 20090151554 | HYDROSTATIC DISPLACEMENT UNIT - A hydrostatic displacement unit having pistons which are composed at least partially of a high-grade aluminum material which are made of one piece or a composite to reduce wear. | 06-18-2009 |
| 20090145120 | METHOD AND CIRCUIT ARRANGEMENT OF THE SUPPLY OF PRESSUE MEDIUM TO AT LEAST TWO HYDRAULIC CONSUMERS - The invention relates to a method and a circuit arrangement for controlling and regulating the supply of pressure medium to at least two hydraulic consumers, which are assigned in each case a directional valve for setting the flow and a setpoint signal source, by means of a pump with a variable displacement, which can be regulated by means of a displacement controller. The pump displacement is regulated according to the flow required by the setpoint signals. The individual load pressure of the consumers and of the consumer having the highest load pressure are determined. The directional valve of the highest loaded consumer is controlled to a valve-spool position y | 06-11-2009 |
| 20090133396 | 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 time, its passive side can be relieved to the tank, and with a device for pressure limiting pressure regulation, which comprises pressure limiting valves, by means of which the working lines of the pump can be connected to the servo lines. To reduce the servo pressure load and improve the reaction time, check valves which shut off in the direction of the servo system are provided, by means of which the two servo sides can be connected in each case to the charge pressure via a relief line. Moreover, the device for Pressure limiting pressure regulation comprises an orifice which can be positioned in a line leading to the passive servo side. The invention relates, furthermore, to a method for pressure. | 05-28-2009 |
| 20090126512 | METHOD FOR SENSING APPLIED FORCE FOR CONTROLLING THE MATERIAL REMOVAL RATE FOR A FLAT FINE MACHINED SURFACE - A method of adjusting the applied force for controlling the material removal rate on a work piece. A machining device having a load providing device, a force transducer and a force applying device wherein the force-applying device provides a load to the work piece to remove material. The force applied to the work piece by the load providing device and the position of the load providing device are sensed and transmitted to a master controller that adjusts the force applied to the work piece based upon these readings. | 05-21-2009 |
| 20090111591 | HYDROSTATIC BENT AXIS DRIVE UNIT HAVING A SYNCHRONIZING JOINT FOR THE ANGULARLY ADJUSTABLE DRIVE CONNECTION OF A CYLINDER BLOCK TO A DRIVESHAFT - The invention relates to a hydrostatic bent axis power unit having a synchronizing joint for the angularly adjustable drive-connection of a cylinder block, which has pistons, to a driveshaft. The synchronizing joint has a shank which is rotatable about its longitudinal axis and thereby defines the joint axis, on the ends of which shank at the drive input and drive output side are provided in each case laterally projecting roller carriers which define a roller axis, which is aligned approximately at right angles to the joint axis, for rollers which are provided on the roller carriers, and against the two ends of which shank bears in each case one connecting pin which is aligned in the direction approximately of the joint axis. In each case one securing element is provided at the two ends of the shank, which securing element both holds the connecting pin in the region of the joint axis in contact against the shank and also prevents the rollers from sliding off the roller carriers. | 04-30-2009 |
| 20090107135 | 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 first and second hydraulic lines and is controlled in order to actuate the by-pass valve when certain predetermined conditions are present in order to relieve pressure within the hydrostatic circuit. | 04-30-2009 |
| 20090091301 | LOAD LOWERING REGENERATIVE ENERGY SYSTEM WITH CAPACITOR CHARGE AND DISCHARGE CIRCUIT AND METHOD OF OPERATING THE SAME - An operating system for an electric motor associated with a hydraulic pump for moving a load and method of operating the same. The operating system includes a power source that is electrically connected to the electric motor wherein a capacitor charge and discharge circuit is used in association with a capacitor in order to store energy within the capacitor as the operating system is in use. | 04-09-2009 |
| 20090064856 | 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 are received and engage the housing. The support balls are located radially from the plurality of reciprocating pistons such that the distance between the axis of rotation of an input shaft and a piston axis of the plurality of pistons is significantly less than the radial distance between the axis of rotation of the shaft and the center points of the support balls, and wherein the pivot axis passing through the center points of the support balls lies in or near the plane passing through the piston/slipper ball joints. | 03-12-2009 |
| 20090044871 | LOW PRESSURE RISE RATE PILOT OPERATED POPPET RELIEF VALVE - A relief valve for a hydraulic machine that combines a poppet valve assembly and a pilot valve assembly together using a connector pin wherein internal fluid passageways within the poppet and pilot spools provide a fluid flow path between the inlet of the valve and a cavity disposed between the poppet and pilot. As a result of the internal passageways fluid is metered to the interior cavity to provide additional control and stability within the relief valve. | 02-19-2009 |
| 20090038564 | FAN DESIGN AND METHOD OF OPERATING - A method of cooling a radiator in an internal combustion engine wherein a plurality of fan assemblies is provided. Specifically, each fan assembly has a housing with an interior containing a fan blade and an exterior having six sides to form a hexagonal perimeter. The fan assemblies are then arranged side by side to form a cluster of fan assemblies in order to maximize the amount of fan assemblies that may be provided on an enclosure. The cluster of fan assemblies is then placed adjacent to a radiator to control the air flow over the radiator in order to cool the engine. | 02-12-2009 |
| 20090031893 | 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 device is able to provide three operating positions depending on the angle of the swashplate. | 02-05-2009 |
| 20090020004 | 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 of a pivotable dual swashplate. In order to minimize the dead volumes of the two axial piston units, the rotational axes of the two axial piston power units are offset with respect to the pivot axis of the dual yoke or of the swashplate by a magnitude such that, at all pivot angles, the power unit pistons, at dead centre, are located in the direct vicinity of the bore end of the cylinder block. | 01-22-2009 |
| 20090019435 | SYSTEM AND METHOD FOR OVER THE AIR PROGRAMMING - A method for programming computer code at a remote platform having a local computer. A home device sends a computer code to the local computer via wireless transmission wherein the computer code is stored within an alternate area of a flash memory. Once a complete copy of the computer code is recognized at the local computer the integrity of the computer code is checked and if proper, a new boot address is assigned at the local computer. At this time the local computer is rebooted such that when the computer restarts the alternate computer code is used thus effectively updating the computer software. | 01-15-2009 |
| 20080307956 | WEB-LESS VALVE PLATE - A hydraulic unit that uses first and second support structures to eliminate the use of webs within an arcuate inlet and outlet of a valve plate. Specifically, a valve plate body extends between an inner and outer diameter wherein the outer diameter in a first position is placed in close proximity to a first support structure and the inner diameter is placed in close proximity to a second support structure. Thus, stress of hydraulic fluid flowing through the arcuate inlet or outlet deflects the inner and outer diameters causing them to engage the first and second support structures such that stress is passed to the first and second support structures and the valve plate is stiffened. | 12-18-2008 |
| 20080283132 | GASKET WITH INTERNAL SCREEN AND METHOD OF MANUFACTURING THE SAME - A gasket for a hydraulic housing and a method of manufacturing the same. The gasket is made by taking a metal body having a first and second side and coating the first and second side with rubber. An area of the rubber is then burned off by a laser and then in that area the laser is used to create a plurality of openings that act to filter hydraulic fluid that flows through the gasket. | 11-20-2008 |
| 20080276997 | LOW RISE RATE DIRECT ACTING RELIEF VALVE - A relief valve assembly. The relief valve assembly has a housing that houses a sleeve element that surrounds a spool that has a spring guide disposed therein and is biased away from the spool by a spring. A fluid flow path is created from a valve exit of the assembly through the sleeve and spool via a series of openings, grooves and orifices in at least one position of the relief valve assembly. The fluid flow path acts to reduce pressure rise rate. | 11-13-2008 |
| 20080265199 | ZERO LEAKAGE BALANCE VALVE SYSTEM - A valve assembly for a hydraulic device. The valve assembly has a valve seat within a valve passageway used in combination with a spool. The spool has a first section wherein a flexible element is disposed within a cavity of the first section such that in a first position the spool and specifically the flexible element engages the valve seat to provide zero leakage from the valve passageway into a tank passageway. Additionally, the spool is designed to have an additional section at a second end to provide equal sealing areas at both the first and second ends of the spool to balance the forces within the valve passageway. | 10-30-2008 |
| 20080228336 | METHOD AND MEANS FOR SELF CALIBRATING A VALID OPERATING RANGE - A method of calibrating a valid operating range. The method includes loading a default calibration limit and then monitoring an input for new calibration limits provided by an input device. An algorithm then detects if the new calibration limits provide a fault and if not the algorithm rescales the output based upon the new calibration limits to increase the valid operating range. | 09-18-2008 |
