Patents Assigned to Danfoss
  • Leakage compensation arrangement in a control device for a fully hydraulic steering system
    Patent number: 7028469
    Abstract: A leakage compensation system in a control device (S) has a fully hydraulic steering system (1) with a supply connection arrangement having a high-pressure connection (P) and a low-pressure connection (T). A working connection arrangement has two working connections (CL, CR), a control section between the supply connection arrangement (P, T) and the working connection arrangement (CL, CR). A control element (2) for activating the control section, a steering member (3) and an auxiliary fluid path (12) has a valve arrangement (A6, A7), through which hydraulic fluid can be supplied or drained off.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: April 18, 2006
    Assignee: Sauer-Danfoss ApS
    Inventors: Bendt Porskrog, Niels Arbjerg
  • Hydraulic valve system
    Patent number: 7028710
    Abstract: A hydraulic valve system (1) has a supply connection arrangement, having a high-pressure connection (P) and a low-pressure connection, with a working connection arrangement, having two working connections (A, B), with a control valve (3), which is arranged between the supply connection arrangement and the working connection arrangement, and with a non-return valve (24, 28) for each working connection (A, B). The valve being arranged between the control valve (3) and the working connection arrangement. A tappet (36) mechanically opening the valve element (25, 29) of said non-return valve.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: April 18, 2006
    Assignee: Sauer-Danfoss ApS
    Inventor: Martin Raadkjaer Joergensen
  • Backflow preventer
    Publication number: 20060076062
    Abstract: A backflow assembly including a housing with a passage having at least one check valve positioned therein to permit fluid flow in one direction while preventing fluid flow in the reverse direction. The check valve includes a valve head connected to a stem having an outer surface. A hump extends radially outward from the outer surface of the stem. The stem is guided by a bushing during opening and closing of the valve. The bushing includes at least one retention member that moves along the outer surface of the stem during opening and closing of the valve. The interaction between the retention member and the hump on the outer surface of the stem causes a higher friction loss during opening and closing of the valve than other portions of the outer surface.
    Type: Application
    Filed: October 7, 2004
    Publication date: April 13, 2006
    Applicant: Danfoss Flomatic Corporation
    Inventor: Bo Andersson
  • Electro active elastic compression bandage
    Publication number: 20060079824
    Abstract: This invention relates to an elastic bandage for supporting a body extremity such as a leg. Such bandages are used to overcome problems with fluid retention and swelling in the legs, occurring as a consequence of varicose veins, vascular incompetence, pregnancy, etc. It is a task of this invention to supply an active support for a body extremity such as a leg, which can be used by a person underneath the clothes and will not reduce the mobility of the patient. This task is solved in that an elastic bandage comprises an elastic layer for surrounding a body extremity to exert compressive force on the extremity, the bandage being, at least partly, formed by elastomeric actuation elements, whereby electrical control of the compressive force is possible, and where the control is due to a signal from some sensing system.
    Type: Application
    Filed: February 24, 2004
    Publication date: April 13, 2006
    Applicant: Danfoss A/S
    Inventors: Jakob Munch-Fals, Mohamed Benslimane, Peter Gravesen, Theiss Stenstroem
  • Vehicle with an attachment
    Patent number: 7025148
    Abstract: The invention concerns a vehicle with an attachment, which has a lifting drive with at least one hydraulic cylinder and a control device, the control device having a position sensor and a position generator. It is endeavored to improve the position control of the attachment. For this purpose, the control device has a trajectory generator, which generates a trajectory in dependence of a desired position value and an acceleration limit, said trajectory being optimized with regard to a time specification, and a follower, which controls the lift drive in dependence of the trajectory.
    Type: Grant
    Filed: March 11, 2004
    Date of Patent: April 11, 2006
    Assignee: Sauer-Danfoss APS
    Inventor: Poul Erik Hansen
  • Low input torque rotor for vane pump
    Publication number: 20060073031
    Abstract: A vane-type fluid displacement unit having a housing, a drive shaft extending through the housing, a rotor secured to the drive shaft and disposed within the housing, the rotor having at least one non-smooth top or bottom surface, and at least one vane secured to the rotor.
    Type: Application
    Filed: September 17, 2004
    Publication date: April 6, 2006
    Applicant: Sauer-Danfoss Inc.
    Inventors: Michael Betz, Eric Bretey, Robert Klinkel, Kevin Landhuis
  • Compressor intended to compress coolant fluid for a refrigeration or air conditioning installation
    Publication number: 20060070398
    Abstract: A compressor intended to compress coolant fluid for a refrigeration or air conditioning installation, comprising a substantially vertical body consisting of a casing intended to receive in particular a lubricating liquid in its bottom portion forming a reservoir, and means of heating the lubricating liquid. The means of heating the lubricating liquid and means of acoustic insulation and thermal insulation situated below the heating means are placed close to the bottom wall of the casing.
    Type: Application
    Filed: September 28, 2005
    Publication date: April 6, 2006
    Applicant: DANFOSS COMMERCIAL COMPRESSORS
    Inventors: Jean De Bernardi, Yves Rosson
  • Elastomer actuator and a method of making an actuator
    Publication number: 20060066183
    Abstract: A tubular elastomer actuator with a shape in a cross-sectional view which shape exposes at most one single axis of symmetry of a specific length, e.g. an oval shape. The actuator could be made from a sheet made from a plurality of plate shaped elements which are laminated together and rolled. Each plate shaped element may have a corrugation that gives the element an anisotropic structure, and contains an electrode on only one surface. The actuator displacement is the result of shrinkage displacement of the plate shaped elements upon the application of electrical field across their thickness.
    Type: Application
    Filed: September 18, 2003
    Publication date: March 30, 2006
    Applicant: Danfoss A/S
    Inventors: Mohamed Benslimand, Peter Gravesen
  • Room heating system
    Publication number: 20060065754
    Abstract: A room heating system includes a heatable floor having a floor heating system, and a room thermostat having a room air sensor and being connected with a regulating unit for the floor heating system. The temperature control in a room is improved by providing the room thermostat with a surface temperature sensor, which determines a temperature on the surface of the floor from a distance.
    Type: Application
    Filed: September 22, 2005
    Publication date: March 30, 2006
    Applicant: Danfoss A/S
    Inventors: Lasse Joergensen, Lars Dam, Jesper Hansen
  • Hydraulic machine
    Publication number: 20060067848
    Abstract: The invention concerns a hydraulic machine with a toothed set comprising a toothed ring with an inner toothing, whose circumferential surface extends in parallel with its axis, and a gear wheel (3) with an outer toothing, whose circumferential surface (24) extends in parallel with its axis, at least one tooth flank having an edge as an axial end of a section, which is located between the circumferential surface and a surface directed radially inwards. It is endeavoured to reduce the wear. For this purpose it is ensured that in the radial direction an edge (22, 23) ends so as to be offset inwards in relation to the circumferential surface (24).
    Type: Application
    Filed: September 27, 2005
    Publication date: March 30, 2006
    Applicant: Sauer-Danfoss ApS
    Inventors: Rene Andersen, Kim Hansen, Claus Johansen
  • Piston compressor, particularly hermetical refrigerant compressor
    Publication number: 20060067844
    Abstract: The invention concerns a piston compressor (1), particularly a hermetical refrigerant compressor, with a compression chamber (2), which is bordered by a cylinder (3), a piston (4) and a valve plate arrangement (5), which has a suction valve arrangement (14, 15) and a pressure valve arrangement (16, 17). It is endeavoured to provide a piston compressor with a good efficiency. For this purpose, it is ensured that the suction valve arrangement (14, 15) opens into the compression chamber (2) in a central area of the cylinder (3) and the pressure valve arrangement (16, 17) has a plurality of pressure openings (16), which are located in an annular area surrounding the suction valve arrangement (14, 15).
    Type: Application
    Filed: September 27, 2005
    Publication date: March 30, 2006
    Applicant: Danfoss Compressors GmbH
    Inventor: Frank Iversen
  • Four wheel traction control valve
    Patent number: 7017703
    Abstract: 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 series, and the right front motor and left rear motor in series. A valve system has a first relief valve line providing flow from a right rear motor inlet side to a left rear motor inlet side, and a second relief valve line providing flow from a left rear motor inlet side to a right rear motor inlet side. A first check valve line provides flow from a right rear motor outlet side to the right rear motor inlet side, and a second check valve line provides flow from a left rear motor outlet side to the left rear motor inlet side.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: March 28, 2006
    Assignee: Sauer-Danfoss Inc.
    Inventor: Ryan D. Smalley
  • Capillary carrier with leak supervision
    Publication number: 20060054230
    Abstract: In a capillary carrier with an inlet and an outlet, a channel is formed and extends between the inlet and the outlet. At least one capillary tube is arranged within the channel, and sealing elements, by which the capillary tube is sealingly fixed to the channel, are arranged at least near an inlet portion and an outlet portion of the capillary tube. An area is formed limited by a part of the channel, the sealing elements and the exterior of the capillary tube, which is in connection with the exterior of the carrier through a fluid communication pad, whereby a possible fluid leak across the sealing elements will be led to this area, and from there to the exterior of the carrier.
    Type: Application
    Filed: January 24, 2004
    Publication date: March 16, 2006
    Applicant: Danfoss A/S
    Inventors: Per Rasmussen, Heiko Arndt
  • Hydraulic cartridge valve solenoid coil for direct mount to a printed circuit board
    Patent number: 7011113
    Abstract: A hydraulic cartridge valve is provided that is moveably received within a manifold in fluid communication with a hydraulic unit, such as that which drives heavy machinery. The present invention comprises a solenoid coil secured to and operatively connected to the hydraulic cartridge valve. In addition, a circuit board is secured to and in electronic communication with the solenoid coil. A controller area network is electronically connected to the circuit board such that a computer controls the operation of the solenoid coil, thereby controlling the performance of the hydraulic cartridge valve. The solenoid coil is secured to the cartridge valve by a securing nut and has a plurality of pins for directly mounting the coil to the circuit board.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: March 14, 2006
    Assignee: SAuer-Danfoss Inc.
    Inventor: Michael D. Gandrud
  • Axial piston engine with integrated filling pump
    Publication number: 20060051229
    Abstract: The invention relates to an axial piston engine with a filling pump integrated in a receiving bore of the axial piston engine, which filling pump comprises a gerotor set with an externally toothed inner ring and an internally toothed outer ring and also an inner thrust plate and an outer thrust plate. The two thrust plates enclose the gerotor set between them and, on their surfaces facing away from the gerotor set, are in each case supported via a pressure field seal, which surrounds the pressure field regions formed in the thrust plates, in such a way on the housing walls axially enclosing the filling pump that lateral play in the form of axial mobility of the filling pump is guaranteed.
    Type: Application
    Filed: May 31, 2005
    Publication date: March 9, 2006
    Applicant: Sauer-Danfoss Inc.
    Inventors: Reinhardt Thoms, Carsten Fiebing
  • Method of manufacturing a magnetic strip magnet speed ring
    Patent number: 7007371
    Abstract: A method of manufacturing a speed ring in a continuous process using a magnetizing fixture and a trimming fixture. An unmagnetized magnetic strip is fed into the trolley of a magnetizing fixture, clamped stretched, and magnetized by a coil. The newly magnetized strip is then cut and fed into a trimming fixture. As the magnetized strip goes through the trimming fixture, it runs over a hall effect sensor which determines where a center of a pair of poles is located. Based on where a pair of poles is located the cutting blade of the trimming fixture is activated and a magnetic strip that can be turned into a speed ring is created.
    Type: Grant
    Filed: September 24, 2003
    Date of Patent: March 7, 2006
    Assignee: Sauer-Danfoss Inc.
    Inventors: Stanley N. Didier, Scott Kessler
  • JOYSTICK DEVICE WITH REDUNDANT PROCESSING
    Publication number: 20060044269
    Abstract: 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 is a microprocessor. The microprocessor verifies an output signal prior to transmitting to a remote controller.
    Type: Application
    Filed: July 14, 2005
    Publication date: March 2, 2006
    Applicant: SAUER-DANFOSS INC.
    Inventor: Jesper BLOCH
  • Motor actuator with torque control
    Patent number: 7005818
    Abstract: In a motor actuator, e.g., a valve actuator, comprising a reversible electrical motor, a drive circuit is providing a stop function, when the torque of the motor exceeds a predetermined maximum torque. The drive circuit is constructed as a two-terminal circuit connected in series with the reversible electrical motor, and the electrical power is supplied to the series connection with a mainly fixed voltage VCC and a polarity which provides the desired rotational direction of the motor. This provides the possibility of having the drive circuit positioned close to the motor and maintaining full torque control and stop function with two wire connections.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: February 28, 2006
    Assignee: Danfoss A/S
    Inventor: Jens Moeller Jensen
  • Hydraulic spool valve for use in a hydraulic vehicle drive
    Patent number: 7000387
    Abstract: A hydraulic spool valve is provided in which two inlet bores and an outlet bore lead into a housing. A spool-valve piston which is under the influence of compression springs on both sides can be displaced longitudinally in the housing. When a difference in pressure of the hydraulic fluid in the inlet bores occurs, the inlet bore which conducts the lower pressure in each case is connected to the outlet bore. The two compression springs are pre-stressed and have an additional expansion path. During the displacement of the spool-valve piston from a neutral central position into an extended intermediate position, the two compression springs therefore remain in operative connection with the spool-valve piston, in which case the spring forces counterbalance each other until the intermediate position is reached.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: February 21, 2006
    Assignee: Sauer-Danfoss (Neumunster) GmbH & Co. OHG
    Inventor: Axel Widemann
  • Fail safe valve
    Patent number: 6997430
    Abstract: The invention concerns a fail-safe valve having a valve element, and a control motor being connected with the valve element via a driveline. It is endeavored to ensure the tightness of the refrigeration system in a simple manner. For this purpose, it is ensured that the valve element is located inside and the control motor outside a closed valve housing, that the drive line has a magnetic coupling, which acts through the housing, and that the valve element is pressure-released. In addition, a resetting device is provided that causes the valve element to be returned to a predetermined position upon the undesired cessation of control motor operation.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: February 14, 2006
    Assignee: Danfoss A/S
    Inventors: Lars Denning, Kenneth Michelsen, Joergen Seindal Wiwe