Patents Assigned to Danfoss
  • Rotor arrangement for an electrical drive motor of a compressor, particularly a refrigerant compressor
    Publication number: 20050275305
    Abstract: The invention concerns a rotor arrangement for an electrical drive motor of a compressor, particularly a refrigerant compressor, with a rotor (15) having a rotor lamination (20) of stacked sheet plates, and a shaft (8), which is inserted in an axial recess (18) of the rotor lamination (20) and is unrotatably connected with the rotor lamination (20), the recess (28) being formed by openings in adjacent sheet plates (23, 25). It is endeavoured to simplify the manufacturing of such rotor arrangements. For this purpose, it is ensured that openings (24, 26) of different sizes are provided in the sheet plates (23, 15) at least two sheet plates (23) forming a first group, each having an opening (24), which is smaller than the cross-section of the shaft (8), the remaining sheet plates (25) forming a second group, each having an opening (26), which is larger than the cross-section of the shaft (8).
    Type: Application
    Filed: May 10, 2005
    Publication date: December 15, 2005
    Applicant: Danfoss Compressors GmbH
    Inventors: Marten Nommensen, Frank Iversen, Heinz Lassen, Christian Petersen, Beate Sonksen
  • High side NFET gate driving circuit
    Patent number: 6975146
    Abstract: A circuit that provides for a high side NFET gate driver that uses a circuit using only common capacitors, diodes, resistors, and transistors to create a high side NFET gate driver. The system is operated so that when there is a high input the NFET will turn off and when there is a low input the NFET will turn on.
    Type: Grant
    Filed: January 2, 2004
    Date of Patent: December 13, 2005
    Assignee: Sauer-Danfoss Inc.
    Inventor: Joseph J. Schottler
  • Hydraulic valve arrangement
    Patent number: 6971407
    Abstract: The invention concerns a hydraulic valve arrangement with a supply connection arrangement, which has a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, which has two working connections (A, B), which can be connected with a consumer, a directional valve and a compensation valve arranged between the directional valve and the supply connection arrangement, the pressure outlet of the compensation valve being connected with a pressure inlet of the directional valve. It is endeavoured to avoid dangerous situations, which occur because of uncontrolled pressures. For this purpose, it is ensured that the compensation valve has a relief outlet, which can be connected with the pressure outlet.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: December 6, 2005
    Assignee: Sauer-Danfoss APS
    Inventors: Thorkild Christensen, Carsten Christensen, Siegfried Zenker
  • Fully hydraulic steering
    Patent number: 6971472
    Abstract: The invention concerns a fully hydraulic steering with a steering member, a steering unit that can be activated by the steering member, said steering unit comprising a supply connection arrangement (P, T) with a pressure connection (P) and a tank connection (T), and a working connection arrangement (L, R) with two working connections (L, R), and a steering motor, which is connected with the working connection arrangement (L, R). It is endeavored to increase the possibilities of steering. For this purpose, it is ensured that an auxiliary force operated steering valve is arranged in parallel to the steering unit between the supply connection arrangement (P, T) and the working connection arrangement (L, R).
    Type: Grant
    Filed: December 4, 2003
    Date of Patent: December 6, 2005
    Assignee: Sauer-Danfoss ApS
    Inventors: Ove Pedersen, Bjarne Schmidt
  • Hydraulic valve arrangement
    Publication number: 20050257519
    Abstract: The invention concerns a hydraulic valve arrangement (1) with a control valve module (2) comprising a supply connection arrangement with a high-pressure connection (P) and a low-pressure connection (T) and a working connection arrangement with two working connections (A, B) as well as a control valve (3) between the supply connection arrangement and the working connection arrangement. It is endeavoured to improve the control behaviour of the valve arrangement. For this purpose, it is ensured that the control valve module (2) has a return compensation valve (15, 16) between the control valve (3) and at least one working connection (A, B).
    Type: Application
    Filed: May 11, 2005
    Publication date: November 24, 2005
    Applicant: Sauer-Danfoss ApS
    Inventors: Knud Jensen, Carl Dixen
  • Hydromechanical transmission with differential steer
    Patent number: 6966859
    Abstract: A transmission has an HMT which is in parallel with an HST both driving two planetaries which are used for forward/reverse and for differential steer. A two or three mode HMT is created by having a first HST in parallel with two or three mechanical power paths defined by separate clutches. One clutch has a speed reversing gear to produce reverse output speed. A four-element planetary sums the parallel flow and delivers variable speed and torque to two output shafts. The differential steer is created by two planetaries connected with the outputs of the HMT and a second HST. The planetaries have a speed reversing gear on one power path connection. The second HST controls the differential speed between the output shafts by adding speed to one and subtracting speed from the other.
    Type: Grant
    Filed: June 22, 2004
    Date of Patent: November 22, 2005
    Assignee: Sauer-Danfoss, Inc.
    Inventor: Frederic W. Pollman
  • Method for regulating a most loaded circuit in a multi-circuit refrigeration system
    Publication number: 20050252222
    Abstract: A method for regulating a most loaded circuit of a refrigeration system is provided. Each circuit includes at least one case and an EEPR valve. At least one controller communicates with the EEPR valves for receiving signals from the circuits corresponding to operating conditions for each circuit, and for issuing command signals to the EEPR valves and compressor. The operation of each circuit is monitored and a load signal is calculated for each circuit. The load signals for each circuit are compared and the most loaded circuit is determined. The EEPR valve of the most loaded circuit is adjusted to be approximately 100 percent open and a suction pressure of the compressor is adjusted to move a circuit temperature of the most loaded circuit to a target temperature. The process of selecting and regulating the most loaded circuit is repeated after a predetermined period of time.
    Type: Application
    Filed: May 12, 2004
    Publication date: November 17, 2005
    Applicant: Danfoss A/S
    Inventors: Lars Jessen, Christian Bendtsen
  • Dual check-relief valve
    Patent number: 6964163
    Abstract: A dual check and high pressure relief valve that is able to perform the function of a hydrostatic high pressure relief valve and a check valve. The new valve has two poppets separated by a spring that are within two seats within a guide and secured by a plug. By adjusting the seats the relief pressure setting is set. The dual check and high pressure relief valve has three separate passageways that allow fluid flow between different combinations of the passages depending upon the function desired within the hydrostatic circuit. A dashpot is also included between the two poppets to provide positive dampening of the system.
    Type: Grant
    Filed: November 10, 2003
    Date of Patent: November 15, 2005
    Assignee: Sauer-Danfoss, Inc.
    Inventor: Kevin J. Landhuis
  • Discharge check valve assembly for use with hermetic scroll compressor
    Publication number: 20050238518
    Abstract: A discharge check valve assembly for use with a hermetic scroll compressor having a compressor shell is provided. The discharge check valve assembly includes a valve housing and a valve seat located within the valve housing. The valve housing is configured to mount the discharge check valve assembly to the compressor shell. The discharge check valve assembly also includes a discharge fitting and a valve subassembly. The discharge fitting is configured to mount to the compressor shell and configured to connect to a connecting tube in fluid communication with a high-pressure system. The valve subassembly has a valve member movable between an open position and a closed position. Additionally, the valve subassembly is configured to be inserted through the discharge fitting into the valve housing.
    Type: Application
    Filed: April 19, 2005
    Publication date: October 27, 2005
    Applicant: Danfoss Maneurop S.A.
    Inventors: Pierre Ginies, Pierre Soulas, Holger Nicolaisen
  • Method and hydromachine for controlling a displacement
    Publication number: 20050238521
    Abstract: The invention concerns a method and a hydromachine with a commutation device and with expanding and contracting pressure chambers passed by fluid and formed by displacement arrangements. With the method and the hydromachine, it is endeavoured to control a displacement in the hydromachine to keep pressure fluctuations small. For this purpose, the hydromachine has a group of devices, comprising a commutation device and at least two displacement devices, at least two of the devices being adjusted in relation to each other.
    Type: Application
    Filed: April 15, 2005
    Publication date: October 27, 2005
    Applicant: Sauer-Danfoss ApS
    Inventors: Martin Nordborg, Kim Hansen, Heinrich Arnaud
  • Electrical and electronic component cabinet for a refrigeration compressor
    Publication number: 20050229621
    Abstract: Cabinet for a refrigeration compressor delimiting an inner space designed to receive electrical and electronic components, characterized by having at least one support for the electrical and electronic components and a protective cap having an open side face delimited by an edge whose shape at least partially matches the shape of the side wall of compressor, cap being intended to be applied by its open side face against the side wall of the compressor, thus forming one of the walls of the cabinet. The cabinet accommodates the electrical and electronic command, control, and protection components on refrigeration compressors ensuring that the electrical and electronic components are held at their operating temperature and that tightness and vibrations are at an acceptable level.
    Type: Application
    Filed: April 20, 2004
    Publication date: October 20, 2005
    Applicants: DANFOSS COMMERCIAL COMPRESSORS, CARRIER CORPORATION
    Inventors: Jean De Bernardi, Michel Augagneur, Renaat Vandelanotte, Yves Rosson
  • GAS DISTRIBUTION DEVICE
    Publication number: 20050229627
    Abstract: Device for distributing suction gas for a parallel compressor installation, said installation having at least two refrigeration compressors, at least one oil level equalization tube providing a communication between the oil pans provided in the bodies of the compressors, at least one suction gas distribution device comprising an essentially straight distribution tube, and branch tubes. The branch tubes have at least one portion forming an angle of between 55° and 65° with the axis of the distribution tube. The present invention uses a special geometry for equalizing the pressures in the oil pans of each compressor and thus using simple equalization channels.
    Type: Application
    Filed: April 20, 2004
    Publication date: October 20, 2005
    Applicants: DANFOSS COMMERCIAL COMPRESSORS, CARRIER CORPORATION
    Inventors: Jean De Bernardi, Mickael Euthine
  • Axial valve
    Patent number: 6955331
    Abstract: An axial valve has a housing, an inlet, an outlet, a valve seat between the inlet and the outlet, and a valve element cooperating with the valve seat, and is controlled by a pilot valve arranged between the inlet and the outlet, with the valve element being moveable parallel to a flow path from the inlet to the outlet and surrounding an interior space. Without changing the external measurements of the valve an increased through flow is achieved in that a first section of the flow path leads through the interior space and a pressure space is arranged between the housing and the valve element, in which pressure space in the closed condition of the pilot valve a closing pressure is formed and applied to the valve element.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: October 18, 2005
    Assignee: Danfoss A/S
    Inventors: Soeren Michael Larsen, Erik Casper Joergensen, Michael Birkelund
  • Axial piston hydraulic power unit with pseudo slippers
    Publication number: 20050226737
    Abstract: A combination of a bull nose type and slipper type axial piston pumps. The pseudo slipper axial piston pump has an elongated piston body with a bore disposed therethrough. The bore has a spring within to create a hold down mechanism. Swivelably connected to the piston body is a pseudo slipper that engages an anti-frictional thrust bearing having first and second race elements in parallel relation with a bearing element therebetween. The anti-frictional thrust bearing then controls the angle of the swashplate.
    Type: Application
    Filed: April 7, 2004
    Publication date: October 13, 2005
    Applicant: Sauer-Danfoss, Inc.
    Inventors: Michael Gandrud, Kevin Landhuis
  • Nozzle, especially an atomizing nozzle for an oil burner
    Patent number: 6953161
    Abstract: A nozzle, especially an atomizing nozzle for an oil burner, has a housing with a nozzle opening, and a distributing insert which from the interior of the housing lies on the housing in the area of the nozzle opening and is held in the housing with the help of a deformed housing section. To better assure the functioning of the nozzle an elastically deformable element is arranged between the housing section and the distributing insert.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: October 11, 2005
    Assignee: Danfoss A/S
    Inventors: Birthe Noergaard Laursen, Chinh Minh Trinh
  • Stator for a line-start electric motor
    Publication number: 20050218748
    Abstract: The invention concerns a stator for a line-start electric motor, with a rotor accommodating chamber, in which a rotor is accommodated to be rotatable, and which has accommodating chambers for conducting rods and accommodating chambers for permanent magnets, and with a stator winding comprising several windings, which, during operation of the line-start electric motor under the influence of the rotor, generate a magnetic field with a main axis. In order to increase the efficiency of the line-start electric motor, the rotor accommodating chamber has no constant inner radius, but, in the area of a vertical to the main axis, has a larger inner radius than in the adjacent areas.
    Type: Application
    Filed: February 28, 2005
    Publication date: October 6, 2005
    Applicant: Danfoss Compressors GmbH
    Inventor: Niels Weihrauch
  • Method and means of sealing an electrical conductor through the housing of a fluid filled motor
    Publication number: 20050218733
    Abstract: An electrical conductor is provided for a fluid filled motor having a housing. The electrical conductor comprises insulating elements received by a passage extending through the housing, and a terminal bolt passing through the insulating elements. The electrical conductor further comprises sealing means between the terminal bolt, insulating elements, and the housing, and a fastening nut secured to the terminal bolt compressing the sealing means to seal against fluid flow through the passage. A method of sealing said electrical conductor through the housing of a fluid filled motor also is provided.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 6, 2005
    Applicant: Sauer-Danfoss Inc.
    Inventor: Michael Gandrud
  • Hydrostatic displacer unit with a pivoting mechanism and a servo unit having pressure-reducing valves
    Publication number: 20050217736
    Abstract: The invention relates to a hydrostatic displacer unit with a pivoting mechanism for two conveying directions for the continuous variation of the stroke of displacement pistons and with a servo system by means of which the pivoting mechanism can be moved in opposite pivoting directions. The servo system comprises at least two servocylinders, by means of which servopjstons which actuate the pivoting mechanism can be moved, and an adjusting device in each case with a pressure-reducing valve for each servocylinder. The control pistons of the pressure-reducing valves are coupled mechanically along a common axis of movement by means of a spring arrangement.
    Type: Application
    Filed: March 24, 2005
    Publication date: October 6, 2005
    Applicant: Sauer-Danfoss Inc.
    Inventor: Reinhardt Thoms
  • Method for ignition of an oil burner and electronic ignition circuitry for oil burners
    Publication number: 20050214703
    Abstract: A method for ignition of an oil burner and electronic ignition circuitry for oil burners. Electronic ignition circuit for oil burners, for generating temporally spaced sparks. The electronic circuitry comprises circuitry for producing temporally spaced sparks with a spacing not corresponding to a half-period of the AC mains frequency or of a multiple of the AC mains frequency. The circuitry may be used in a method for ignition of an oil burner forming part of an oil burner system, where said oil burner comprises electronic circuitry for producing a first sequence of temporally spaced sparks for ignition of the oil. According to the method, the electronic circuitry is adjusted to subsequently produce a second sequence of temporally spaced sparks if it is detected that the ignition results in acoustic resonance in the oil burner system using said first sequence of temporally spaced sparks.
    Type: Application
    Filed: April 25, 2002
    Publication date: September 29, 2005
    Applicant: Danfoss A/S
    Inventor: Lars Andreasen
  • Pressure limiting valve in a hydraulic machine and hydraulic machine having a pressure limiting valve
    Publication number: 20050211308
    Abstract: In the housing 1 of a hydraulic machine, the pressure Pi acts in the chamber 2. For this purpose, a passage opening 4 is provided, which is formed as a valve seat 5. A valve body 6 can be displaced longitudinally in the housing 1 and forms a pressure-tight spring chamber for an inner valve spring 21. The spring chamber is connected to the chamber 2 via a pressure equalizing hole 9. The prestress of the inner valve spring 21 can be set by means of a setting screw 18. In addition, there is an outer valve spring 22. Both the valve springs load the valve body 6 with the effect of closing it. The pressure equalizing valve described combines a compact design with an advantageous flow characteristic. When a maximum value of p1 is reached, the valve body 6 lifts off the valve seat 5 and hydraulic fluid from the chamber 2 flows away via the valve chamber 3.
    Type: Application
    Filed: February 18, 2005
    Publication date: September 29, 2005
    Applicant: Sauer-Danfoss Inc.
    Inventors: Reinhardt Thoms, Bernd Hames, Markus Reimer