Patents Assigned to Sauer-Danfoss (Norborg) A/S
  • Electrical steering system
    Patent number: 6693405
    Abstract: An electrical steering system for a vehicle includes an electrically supplied steering motor arrangement which is connected with an inverter arrangement, whose output voltage is influenced by a computer arrangement, and a sensor arrangement. To reduce the cost of the steering system while also allowing the steering system to be steerable during braking in the case of a fault, the steering motor arrangement has a redundant steering motor which is connected with the computer arrangement via two separately run control circuits. The control circuits have separate electric supplies and the computer arrangement is redundant.
    Type: Grant
    Filed: October 30, 2001
    Date of Patent: February 17, 2004
    Assignee: Sauer-Danfoss Holding A/S
    Inventors: Mogens Blanke, Jesper Sandberg Thomsen, John Kristensen, Torben Frederiksen
  • Vehicle hydraulic driving system
    Patent number: 6688419
    Abstract: A hydraulic drive for a vehicle has a pressure source (7) generating a predetermined pressure for maintaining the operating pressure of a hydraulic motor (5), a braking cylinder (18) with a spring chamber (20) comprising a spring arrangement (19) for operating a braking arrangement (17) and a release chamber (21) that can be acted upon by pressurised fluid from the pressure source (7) against the force of the spring arrangement (19) with the purpose of retaining the braking device (17) in its release position, and comprises a braking control valve (22) that, in a release position, releases a flow from the pressure source (7) to the release chamber (21).
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: February 10, 2004
    Assignee: Sauer-Danfoss Holding A/S
    Inventors: Uffe Lykke Eriksen, Welm Friedrichsen
  • Axial piston unit for integrated wheel hub
    Patent number: 6688417
    Abstract: An integrated wheel hub assembly includes a hydrostatic spindle assembly that has a spindle with a hydrostatic rotational power unit and integral high-pressure passageways therein, a wheel hub rotatably supported by the spindle assembly, and an axle shaft extending through the spindle for transmitting power from the hydrostatic unit to the wheel hub through a planetary gear set reducer. For radial compactness, the swashplate of the hydrostatic power unit resides outside the wheel hub.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: February 10, 2004
    Assignee: Sauer-Danfoss Inc.
    Inventor: Jeffrey C. Hansell
  • Pump housing mounting flange with tangentially positioned mounting slots
    Patent number: 6688858
    Abstract: A pump housing assembly includes a housing, a hub portion, and a flange. The housing has an end cowling defining a transition from a central portion of the housing to a transverse end portion. The hub portion extends longitudinally outwardly from the transverse end portion of housing. The flange extends radially outwardly from the outward end of the hub and is in spaced longitudinal relation to the end of the cowling to create a space to receive a head of a mounting bolt. The flange has an outer periphery with a pair of tangentially extending slots having an open end. The space for receiving a head of a mounting bolt is less than the length of a shank of a mounting bolt, to minimize the length of the housing. The slots have a width sufficient to receive the movement of a shank into and out of the open ends of the slots.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: February 10, 2004
    Assignee: Sauer-Danfoss Inc.
    Inventors: Nick Boone, Larry Walker, David Dirks
  • Method for steering a vehicle and steering system therefore
    Patent number: 6684975
    Abstract: A method for steering a vehicle and a steering system (1) comprises: a vehicle, with a first wheel steering arrangement (10), and a second articulated steering arrangement (11), a steering unit (2) which is common for both steering (10, 11) arrangements and a sensor arrangement connected to a corrective device to sense a steering deflection of the second steering arrangement (11). A dead band is monitored by the steering deflection of the second steering (11) arrangement, a correction of the second steering (11) being effected when leaving the dead band and activating the first steering arrangement (10).
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: February 3, 2004
    Assignee: Sauer-Danfoss Holding A/S
    Inventor: Tom Rudolph
  • Hydromechanical transmission electronic control system for high speed vehicles
    Publication number: 20040014557
    Abstract: An electronic transmission control system is provided that can achieve a transmission ratio based on the operator inputs and the current vehicle operating conditions. The transmission constantly connects the engine to the load, and the transmission ratio is only varied by a change in command from the present invention. The transmission's mechanical function is solely to vary the ratio between its input and output. In using the present invention, an operator must select an operating mode, either automatic or manual, using a two-position switch. While in the automatic mode, the present invention determines the vehicle speed by considering the position of the throttle and the operator's use of brakes. In the manual mode, the present invention further considers the operator's selection of a gear condition.
    Type: Application
    Filed: May 12, 2003
    Publication date: January 22, 2004
    Applicant: Sauer-Danfoss Inc.
    Inventors: Ryan R. Carlson, Manfred Maiers, Steven H. Gluck
  • Tooth set for a hydraulic machine
    Patent number: 6672854
    Abstract: The invention concerns a tooth set for a hydraulic machine, particularly a steering unit, with a toothed ring, having teeth, which are formed by means of inserts arranged in a housing, and a gear wheel arranged inside the toothed ring. It is endeavoured to simplify the production of such a tooth set. For this purpose, each inset (10) has, at least at its ends, a plate-like shape and the ends are fixed in the housing (11) in corresponding slots (17, 18).
    Type: Grant
    Filed: June 14, 2002
    Date of Patent: January 6, 2004
    Assignee: Sauer-Danfoss Holding A/S
    Inventors: Axel Patsch, Tage Christiansen, Hans Christian Petersen, Jørgen Pedersen
  • Method of steering a vehicle
    Patent number: 6668967
    Abstract: The invention concerns a method of steering a vehicle, particularly an articulated vehicle, in which a valve element of a main valve is moved so that it releases or closes connections between a supply connection arrangement and a working connection arrangement in dependence of a steering direction and a steering angle. To improve the steering comfort, the movement speed of the valve element is controlled.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: December 30, 2003
    Assignee: Sauer-Danfoss Holding A/S
    Inventors: Ole Vincentz Sørensen, Svend Giversen, Lars Mortensen, Johan van Beek
  • Swing cylinder oscillation control circuit and valve for oscillating booms
    Patent number: 6666125
    Abstract: A swing cylinder oscillation control circuit and valve for oscillating booms connects two hydraulic cylinders with a shuttle valve and two check valves to provide the higher cylinder pressure to a fluid inlet and a lower cylinder pressure to a fluid outlet of a fast-opening and a slow-closing check valve. The fast-opening and slow-closing check valve uses a poppet and spring to set a valve opening pressure and uses internal flow connections to a large diameter piston that works with mechanically adjustable piston and poppet strokes to control the time for valve closing.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: December 23, 2003
    Assignee: Sauer-Danfoss Inc.
    Inventor: Bruce E. Gunzenhauser
  • METHOD OF MAKING CLOSED CAVITY PISTONS
    Publication number: 20030226876
    Abstract: A method of securing a cap on a piston body includes forming a first annular V-shaped surface at an open end of a cylindrical piston body; forming a second annular V-shaped surface on an annular surface of an oil conduit in the interior center of the piston body; forming a cap to close the open end of the piston body and forming a pair of annular surfaces therein which are flat in shape and in contact with first and second annular V-shaped surfaces on the piston body; placing the cap over the open end of the piston body and thereby placing the annular surface on the cap and the body in close intimate contacting relation; and welding the respective annular surface of the cap and the piston body together by subjecting the cap and body to an extreme high current density to fuse respective contacting annular surfaces together.
    Type: Application
    Filed: June 10, 2002
    Publication date: December 11, 2003
    Applicant: Sauer-Danfoss Inc.
    Inventor: Robert J. Stoppek
  • Hydraulic valve system
    Publication number: 20030226597
    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: Application
    Filed: May 27, 2003
    Publication date: December 11, 2003
    Applicant: Sauer-Danfoss (Nordborg) A/S
    Inventor: Martin Raadkjaer Joergensen
  • Vehicle steering system and method of steering
    Publication number: 20030229430
    Abstract: A method for steering a vehicle, in which a steering motor (4) is activated in dependence of the activation of a steering member (1), a steering motor angle and a steering member angle are detected and an error in the correlation between the steering member (1) and the steering motor (4) is compensated, stored data being used for said compensation of the error. Further, the invention concerns a steering arrangement (100).
    Type: Application
    Filed: June 6, 2003
    Publication date: December 11, 2003
    Applicant: Sauer-Danfoss (Nordborg) A/S
    Inventor: Johan van Beek
  • Steering system and method for steering a vehicle
    Patent number: 6655492
    Abstract: A steering system and a method for steering a vehicle, that has a wheel steering and an articulated steering. The steering system (1) has a steering unit (2), a first steering motor arrangement (7), which acts upon steered wheels, a second steering motor arrangement (8), which acts upon a converting kit, and a selection valve (6), which connects the steering unit (2) with either the first steering motor arrangement (7) or the second steering motor arrangement (8) in such a way that a steering will activate either the wheel steering or the articulated steering.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: December 2, 2003
    Assignee: Sauer-Danfoss Holding A/S
    Inventors: Torben Juul, Tom Rudolph
  • Device for attenuating the pitching of an engine-driven vehicle
    Patent number: 6654675
    Abstract: The invention relates to a device for damping the pitching of an engine-driven vehicle with a chassis and axles 5, at least one of which is mounted fixedly on the chassis. The aim of the invention is to provide a simplified corresponding device. To this end, the torque of at least one wheel borne on the axles (5) is influenced on the basis of the size of the pitching in such a way that the pitching. is damped.
    Type: Grant
    Filed: August 19, 2002
    Date of Patent: November 25, 2003
    Assignee: Sauer-Danfoss Holding A/S
    Inventors: Søren Pedersen, Per Nielsen Lindholdt, Welm Friedrichsen, Asger Flintholm
  • Hydraulic valve system
    Publication number: 20030205128
    Abstract: A hydraulic valve system (1) has a supply connection arrangement having a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, having two working connections (A, B) connectable with a motor (2), with a directional valve (4), which is arranged between the supply connection arrangement (P, T) and the working connection arrangement (A, B), and with a compensation valve (8), which is acted upon in a first operation direction by a spring (22) and a pressure in a pressure chamber (23), which is connected with a load-sensing line (LS), and in a second operation direction, which is opposite to the first operation direction, by a pressure at the directional valve (4).
    Type: Application
    Filed: April 22, 2003
    Publication date: November 6, 2003
    Applicant: Sauer-Danfoss (Nordborg) A/S
    Inventors: Siegfried Zenker, Thorkild Christensen
  • Hydraulic valve system
    Publication number: 20030205278
    Abstract: A hydraulic valve system (1) has a supply connection arrangement, having a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, having two working connections (A, B), which can be connected with a hydraulic motor (2), and a directional valve (4) between the supply connection arrangement (P, T) and the working connection arrangement (A, B), which is connected with the working connection arrangement (A, B) via working lines (17, 18), in which are arranged check valves (21, 22), which can be opened by means of pressure.
    Type: Application
    Filed: April 24, 2003
    Publication date: November 6, 2003
    Applicant: Sauer-Danfoss (Nordborg) A/S
    Inventors: Siegfried Zenker, Thorkild Christensen
  • Hydraulic valve system
    Publication number: 20030205279
    Abstract: A hydraulic valve system (1) with a supply connection arrangement, has a high-pressure connection (P) and a low-pressure connection (T), and a working connection arrangement, having two working connections (A, B), which can be connected with a motor, and a directional valve (4) and a compensation valve (9). A compensation valve (9) is arranged after the directional valve (4) in the flow direction and a pressure relief device (43) is arranged between the directional valve (4) and the low-pressure connection (T).
    Type: Application
    Filed: April 24, 2003
    Publication date: November 6, 2003
    Applicant: Sauer-Danfoss (Nordborg) A/S
    Inventors: Siegfried Zenker, Thorkild Christensen
  • Control system for hydrostatic pump
    Patent number: 6640687
    Abstract: A non-feedback proportional system is provided to achieve desired operating characteristics which will allow the control of a hydrostatic transmission to closely approximate the control performance of a displacement feedback control system by establishing certain parameters relating to (1) the servo spring rate; (2) the valve plate index; (3) valve plate crossport/trap; (4) valve plate porting geometry; (5) swashplate offset; and (6) piston bore volume.
    Type: Grant
    Filed: August 9, 2002
    Date of Patent: November 4, 2003
    Assignee: Sauer-Danfoss Inc.
    Inventors: Stephen C. Frantz, Shannon D. Carver, Craig C. Klocke, Dennis M. Greene
  • Hydraulic steering system
    Publication number: 20030196432
    Abstract: A hydraulic steering system (1) with a supply connection arrangement, having a high-pressure connection (P) and a low-pressure connection (T), and with a working connection arrangement (L, R), a directional valve (2) and a metering pump unit (3, 4) being arranged between the supply connection arrangement and the working connection arrangement, the metering pump arrangement having at least two hydraulically parallel-connected and mechanically parallel-operated metering pumps (3, 4) with a shut-off valve (6) in a hydraulic connection between the two metering pumps (3, 4), said shut-off valve (6) having a return spring (16) and a first control inlet (15) that is connected with the high-pressure connection (P).
    Type: Application
    Filed: April 2, 2003
    Publication date: October 23, 2003
    Applicant: Sauer-Danfoss (Nordborg) A/S
    Inventors: Poul Henning Holm Pedersen, Jorgen Clausen, Bjarne Schmidt
  • Hydraulic control system
    Publication number: 20030196545
    Abstract: A hydraulic control system (1) has a hydraulic motor (10), which is connected with a control valve (2) via two working lines (8, 9), the control valve (2) being connected with a low-pressure connection (T) and, via a compensation valve (4), with a high-pressure connection (P), to ensure that a return compensation valve (14, 15) is arranged in each working line, each return compensation valve (14, 15) having a nominal flow line (29), which extends unintersectedly in relation to the nominal flow line (28) of the compensation valve (4).
    Type: Application
    Filed: April 2, 2003
    Publication date: October 23, 2003
    Applicant: Sauer-Danfoss (Nordborg) A/S
    Inventors: Knud Meldgaard Jensen, Carl Christian Dixen, Henrik Kjer Kristiansen, Hans Jorgen Jensen, Jan Maiboll Buhl