Patents Assigned to Danfoss
  • Pressure reduction valve
    Publication number: 20030094202
    Abstract: The invention concerns a pressure reduction valve (1) with a housing (2a, 2b), a valve element (6) being displaceable in the housing and acted upon in one direction by a pressure in a low-pressure chamber connected with an outlet (11) and in the opposite direction by the force of a spring (16), which is arranged in a spring chamber (17) in the housing (2a). It is endeavoured to improve the dynamic behaviour of the pressure reduction valve. For this purpose, a pilot flow path (7, 23, 21) connects the low-pressure chamber (5) and the spring chamber (17) with each other.
    Type: Application
    Filed: November 13, 2002
    Publication date: May 22, 2003
    Applicant: Sauer-Danfoss Holding A/S
    Inventors: Poul Erik Hansen, Svend Erik Thomsen, Thorkild Christensen
  • Process for producing a lubricant coated laquered wire used for forming the stator winding of an electrical refrigerating compressor
    Patent number: 6562767
    Abstract: A lubricant for wire, which is insulated by means of a lacquer coating, and which is used for forming the stator windings of an electrical refrigerating compressor, consists of one or more compounds of the formula CH3—Xn—R, wherein X is a linear or branched hydrocarbon group with n carbon atoms, wherein n is up to 22, and R may be hydrogen or a plurality of different radicals, either in a pure form or dissolved in a suitable solvent. The lubricant is applied to the wire to reduce its coefficient of friction, and it is remarkable for its compatibility with the environmentally unharmful refrigerants, such as R134a (1,1,1,2-tetrafluoroethane), which are used today in refrigerating compressors without capillary tube obstructions.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: May 13, 2003
    Assignee: Danfoss Compressors GmbH
    Inventors: Jürgen Bachmann, Lars L. Finsen, Poul Erik Hansen
  • Method and apparatus for creating clearance between two points
    Patent number: 6561024
    Abstract: A method and apparatus for creating a finite clearance space between two parts under blind assembly conditions involves threading an elongated sensor into a housing containing the part to be sensed by first placing a spacer element on an operative surface of the sensor wherein the spacer element has a radial thickness equal to the finite clearance space. The sensor is screwed unto the housing in a radial direction towards the operative surface of the sensor until the spacer element engages the operative surface, thereby specifically locating the operative surface a precise radial distance from the operative surface.
    Type: Grant
    Filed: February 20, 2001
    Date of Patent: May 13, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventor: Aaron Bell
  • Flow cell
    Patent number: 6557582
    Abstract: A flow cell having at least two inlet channels, each connectable with a reservoir and controllable via valves and ending in an inlet chamber is disclosed herein. Each of two ends of the inlet chamber is connected with a discharge channel through at least two outlet channels. Previously supplied fluid remaining in the inlet chamber is displaced into the discharge channel by newly supplied fluid. The at least two outlet channels establish fluid purity in the chamber via rapid fluid transfer.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: May 6, 2003
    Assignee: Danfoss A/S
    Inventor: Jens Peter Krog
  • Hydrostatic variable displacement pump having springs arranged outside the servocylinder pressure chamber
    Patent number: 6553891
    Abstract: A hydrostatic variable displacement pump has a swash plate (3), which is used to adjust the stroke of displacement pistons in a cylinder block. The swash plate has its angle position pivoted in relation to the stroke direction of the displacement pistons by means of a servosystem. The servosystem is fitted on the housing (6) of the variable displacement pump. The servosystem (4) has a pressure cylinder (18) and a servopiston (7), which together form a servocylinder pressure chamber (8). The servopiston (7) operates in the pressure cylinder (18), is subjected to compressive loading by means of a spring assembly (9,10) and has a piston with at least two servopiston surfaces (11, 12) subjected to the action of pressure.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: April 29, 2003
    Assignee: Sauer-Danfoss Inc.
    Inventors: Carsten Fiebing, Reinhardt Thoms
  • Method of manufacturing bimetal slippers
    Patent number: 6555777
    Abstract: A method of manufacturing male bimetal slippers includes the steps of forming a stem having opposite first and second ends; rigidly affixing a ball on the first end of the stem to form a male slipper body; and capacitance discharge welding a wear pad to the second end of the stem. To manufacture female bimetal slippers the method includes forming a slipper body of a first material, the body having opposite first and second ends, the first end having a ball socket formed therein; and capacitance discharge welding a wear pad of a second material to the second end of the body.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: April 29, 2003
    Assignee: Sauer-Danfoss Inc.
    Inventor: Robert J. Stoppek
  • Electric motor
    Publication number: 20030052559
    Abstract: Specified is an electric motor with a stator (1) that displays a rotating-field-generating rotating-field winding arrangement and a bore (3) in which is arranged a rotor.
    Type: Application
    Filed: August 6, 2002
    Publication date: March 20, 2003
    Applicant: Danfoss Compressors GmbH
    Inventor: Niels Christian Weihrauch
  • Method for controlling a floor heating system
    Patent number: 6533186
    Abstract: A method for controlling a floor heating system, in which a heating circuit in a room is supplied with a heat carrying fluid within a cycle for a supply period, with the supply period being chosen in dependence of the room temperature. To operate the floor heating more favorably with regard to the energy consumption, at least one additional parameter is registered next to the room temperature. The cycle duration and the duration of the supply period are chosen in dependence of the room temperature and the parameter.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: March 18, 2003
    Assignee: Danfoss A/S
    Inventors: Christian Neve, Jørgen Seerup, Eva Kühne
  • Hydromechanical transmission
    Patent number: 6533695
    Abstract: A hydromechanical transmission includes a hydrostatic transmission with coaxially arranged fixed and variable displacement hydrostatic units connected to a planetary gear set. The input shaft of the variable unit extends coaxially through the hollow shaft member of the fixed unit to drive the ring gear of the planetary gear set. The hollow shaft member drives the sun gear of the planetary gear set. An input clutch can be provided to allow the hydromechanical transmission to achieve zero output speed. A charge pump driven by the input shaft of the variable unit can be utilized to insure that the hydraulic units are primed whenever the input shaft turns. The input torque can be applied from either end of the variable unit. A power takeoff shaft option is available from the end of the transmission opposite the input.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: March 18, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Frederic W. Pollman, Steven H. Gluck, Lyle R. Bretz, Thomas D. Pierce, John D. Moline, Bradly Roetman, Michael Todd
  • Mass flow measuring apparatus and method of measuring a mass flow
    Publication number: 20030033888
    Abstract: A mass flow measuring apparatus (1) is described, having tube (2), which at a first position (P1) is coupled as regards oscillation to a first energy converter (4) and at a second position (P2) is coupled as regards oscillation to a second energy converter (5), and having an evaluating device, the first and the second position (P1, P2) being spaced (L) from one another , the energy converters (4, 5) each being operable as oscillation generator and oscillation detector and the energy converters (4, 5) working alternately as oscillation generators. A method can therefore be carried out in which the tube (2) is caused to oscillate alternately at the first position (P1) and at the second position (P2), signals being measured at the second and the first position (P2, P2).
    Type: Application
    Filed: July 12, 2002
    Publication date: February 20, 2003
    Applicant: Danfoss A/S
    Inventor: Henning Max Hansen
  • Closed circuit swing control system
    Patent number: 6520731
    Abstract: A control system for swing cylinders to position a boom on a backhoe or the like includes a pair of double acting hydraulic cylinders on the backhoe frame operatively connected to the boom for swinging the boom with respect to the frame, a closed circuit pump arranged in a closed circuit with the hydraulic cylinders such that the control on the pump is the sole means of controlling the cylinders.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: February 18, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventor: Ian J. C. MacLeod
  • Adjusting means for an axial piston machine of inclined-axis construction
    Patent number: 6520066
    Abstract: An inclined-axis variable displacement unit comprises an output shaft (1), mounted in a housing (4), and a cylinder block (10), the cylinder block (10) being connected to the output shaft (1) via a synchronizing articulation (18), and via working pistons (11) which can be displaced in the cylinder block (10), the cylinder block (10) being mounted in a pivoting body (5) which can be pivoted in relation to the axis of the output shaft (1) by an adjusting means, it being the case that the adjusting means is arranged on that side of the pivoting body (5) on which the output shaft is located.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: February 18, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Eckhard Skirde, Vladimir Galba
  • Hydrostatic variable displacement pump having a compact housing to facilitate swash plate installation
    Patent number: 6517322
    Abstract: A hydrostatic variable displacement pump of swash plate construction has a cylinder block 2, in a housing 1, with displacement pistons 3 guided therein, a swash plate 4 and at least a first bearing 5 and a second bearing 6, which supports the angle adjustable swash plate 4. The housing 1 has a first opening, through which the swash plate can be introduced. The first bearing 5 has a removable outer race 13 which is designed such that, following installation of the second bearing 6 of the swash plate 4 in the bearing seat 8, it fixes said swash plate in the bearing seat 7 of the first bearing 5. The servomechanism 9, 10 is integrated in a cover 10 which closes off the housing 1 on the side of the first bearing 5.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: February 11, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Carsten Fiebing, Reinhardt Thoms
  • Control device for a proportionally adjustable hydraulic pump and a variable displacement pump for a hydrostatic drive
    Publication number: 20030024240
    Abstract: A control device apparatus for a proportionally adjustable hydraulic pump of a closed hydraulic circuit, including an axial piston pump adjustable from a zero position in two pivoting directions, with an electro hydraulic valve configuration for the activation of a piston of the hydraulic pump from both sides and with a feedback device, connected to the piston and whereby the angular pivoting position of the piston can be fed back to the valve configuration as a control signal, the valve configuration having a valve for each pivoting direction of the piston, and the feedback device comprising two mechanical feeler elements, each connected to one of the valves and in sliding engagement with the piston in such a way that the feeler elements are actuated when it leaves the zero position.
    Type: Application
    Filed: July 24, 2002
    Publication date: February 6, 2003
    Applicant: Sauer-Danfoss Inc.
    Inventor: Wilhelm Gollner
  • Axle driving apparatus
    Publication number: 20030027677
    Abstract: An axle driving apparatus comprising a housing being defined by two separable elements joined together along a parting plane; the housing rotatably supporting a pair of axle shafts, each of the axle shafts having a longitudinal axis; the parting plane of the housing being parallel to the longitudinal axes of the axle shafts; and a hydrostatic transmission disposed in the housing and including a pump, a motor, and a member having pump and motor mounting surfaces thereon.
    Type: Application
    Filed: September 27, 2002
    Publication date: February 6, 2003
    Applicant: SAUER-DANFOSS INC.
    Inventor: Alan W. Johnson
  • Axle driving apparatus
    Publication number: 20030027676
    Abstract: An axle assembly has a housing. A hydrostatic transmission separate from the housing is mounted therein. Horizontal axle shafts are rotatably supported in the housing. The hydrostatic transmission includes a center section separate from the housing with fluid conduits connected to hydrostatic rotatable cylinder blocks. A drive shaft extends from one of the blocks and is operatively connected to the axle shafts. Check valves are associated with the conduits to affect fluid flow and are positioned to move in a vertical path at right angles to the axle shafts.
    Type: Application
    Filed: September 27, 2002
    Publication date: February 6, 2003
    Applicant: SAUER-DANFOSS INC.
    Inventor: Alan W. Johnson
  • Center section for integrated transaxles
    Publication number: 20030019680
    Abstract: A center section for separate mounting within the housing of an integrated transaxle comprising, a member having first and second hydrostatic unit mounting surfaces thereon, at least a pair of fluid ports in each of the mounting surfaces, and internal passageways in the member connecting at least one of the fluid ports on one of the mounting surfaces with at least one of the fluid ports on the other of the mounting surfaces.
    Type: Application
    Filed: September 27, 2002
    Publication date: January 30, 2003
    Applicant: SAUER-DANFOSS INC.
    Inventor: Alan W. Johnson
  • Electronic bore pressure optimization mechanism
    Patent number: 6510779
    Abstract: An electronic bore pressure optimization mechanism for dynamically varying the cylinder block piston bore pressure profile in a multiple piston hydraulic unit includes a valve means having a variable orifice disposed in the end cap for metering fluid between leading and trailing pistons in a transition region or between a piston in a transition region and a high or low pressure source; and means for generating a control error signal to the valve means so as to adjust the size of the variable orifice based upon the control signal.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: January 28, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Dennis M. Greene, Jeff L. Herrin
  • Electronic connection cover for a hydraulic component housing utilizing a sealed printed circuit board
    Patent number: 6512677
    Abstract: An electronic connection cover for a hydraulic component has a housing structure having an interior compartment and an electronic control element in the interior compartment. The housing structure has a face for interfacing a hydrostatic component housing. A printed circuit board is affixed to the face of the housing structure with a printed circuit thereon on a side thereof opposite to the housing structure. The printed circuit is connected to the electronic control element. Electrical contacts extend from the printed circuit through the printed circuit board and the electronic connection cover for external connection to an exterior circuit. A seal element is located between the printed circuit board and the electronic control circuit which surrounds the area where the electrical contacts extend through the printed circuit board.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: January 28, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Thomas J. Bergherr, John Fischbach
  • Steering system for a vehicle
    Patent number: 6505701
    Abstract: A steering system (1) for a vehicle with a first steering arrangement (6), with a first sensor (7), with a second steering arrangement (8), which includes an articulated steering, which has a second sensor (9), and with a steering unit (5). To improve the steering comfort, the steering unit (5) is fixedly connected with the first steering arrangement (6) and the second steering arrangement (8) is connected with a follow-up arrangement, which comprises the first sensor (7), a control device (10) and a valve arrangement (11).
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: January 14, 2003
    Assignee: Sauer-Danfoss Holding A/S
    Inventors: Torben Juul, Tom Rudolph, Jørgen Clausen