Patents Assigned to Sauer - Danfoss Holdings A/S
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Publication number: 20040175283Abstract: A rotary fluid pressure device has a first oil passage with relatively high pressure fluid therein surrounding the gear set; a plurality of second oil passageways connecting the first oil passageway to the expanding and contracting oil chambers; and fluid non-return valves in each of the second oil passageways to permit the flow of oil therethrough only in a direction from the first oil passageway to the oil chambers.Type: ApplicationFiled: March 16, 2004Publication date: September 9, 2004Applicant: Sauer-Danfoss Holding A/SInventors: H. C. Petersen, Jorgen Pedersen
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Patent number: 6768322Abstract: Device for measuring an electrical current (I) that flows through a strip conductor (1), with a current-less measuring conductor (3) extending in the flow direction of the current, along and in the proximity of a measuring section (2) of the strip conductor (1), one end of the measuring conductor (3) being electrically connected with one end of the measuring section (2), the other end of the measuring section being provided with a first measuring point (4), and with a second measuring point (5) being electrically connected with the other end of the measuring section (2), characterised in that the measuring section (2) is rectilinear, that the second measuring point (5) is connected directly with the measuring section (2), and a voltage (U) is taken from the measuring points (4, 5).Type: GrantFiled: August 21, 2002Date of Patent: July 27, 2004Assignee: Sauer-Danfoss Holding A/SInventors: Walter Trümpler, Horst Kohnle, Reiner Hinken
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Patent number: 6749037Abstract: A vehicle driving arrangement with at least two axes, each having at least one driven wheel that can be acted upon with a torque of a motor, the motor/motors of each axis being arranged in a supply line, the supply lines being parallel to each other and connected with a pump device, and a valve arrangement being arranged in at least one supply line. It is desired to improve the operability of a hydraulically driven vehicle. For this purpose, the valve arrangement in one supply line has a pressure reducing valve that limits the pressure difference over the other supply line to a maximum value.Type: GrantFiled: May 23, 2001Date of Patent: June 15, 2004Assignee: Sauer-Danfoss Holding A/SInventor: Per Nielsen Lindholdt
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Publication number: 20040074707Abstract: A brake appliance for gerotor motors has a disc assembly brake comprising interacting discs that are subjected to opposing forces from pressurized fluid in one direction to disengage the discs, and from primary and secondary spring forces in the other direction to engage the discs.Type: ApplicationFiled: October 21, 2002Publication date: April 22, 2004Applicant: Sauer-Danfoss Holding A/SInventors: Christian Jessen, Tom Tychsen
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Publication number: 20040067148Abstract: A valve member includes an axially movable spool valve rotatably mounted in the valve member to cause the way that fluid is communicated between the inlet and outlet ports of the device and the volume chambers thereof. An outer surface of the spool has a configuration to react to fluid pressure to effect the timing between the gear set and the valving of valve member and that the timing therebetween will be adjusted when the spool valve is moved axially. A valve actuator comprising a spring loaded plunger controlled by fluid pressure at the inlet and outlet ports is in physical contact with one end of the valve spool.Type: ApplicationFiled: October 8, 2002Publication date: April 8, 2004Applicant: Sauer-Danfoss Holding A/SInventors: H. C. Petersen, Tom Tychsen
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Publication number: 20040062672Abstract: A rotary fluid pressure device has a first oil passage with relatively high pressure fluid therein surrounding the gear set; a plurality of second oil passageways connecting the first oil passageway to the expanding and contracting oil chambers; and fluid non-return valves in each of the second oil passageways to permit the flow of oil therethrough only in a direction from the first oil passageway to the oil chambers.Type: ApplicationFiled: September 26, 2002Publication date: April 1, 2004Applicant: Sauer-Danfoss Holding A/SInventors: H. C. Petersen, Jorgen Pedersen
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Patent number: 6712176Abstract: The invention concerns a hydraulic dual circuit steering system with first circuit having a first control unit and a first steering motor connected with the control unit via working connections, a second circuit having a second control unit and a second steering motor connected with the control unit via working connections, a changeover valve, which in a first position activates the first circuit and deactivates the second circuit and in a second position activates the second circuit and deactivates the first circuit. To improve the steering behaviour, in the first position of the changeover valve the working connections of the second circuit and in the second position of the changeover valve the working connections of the first circuit are connected with a pressure source.Type: GrantFiled: December 27, 2000Date of Patent: March 30, 2004Assignee: Sauer-Danfoss Holding A/SInventors: Siegfried Zenker, Carsten Christensen
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Patent number: 6693405Abstract: 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: GrantFiled: October 30, 2001Date of Patent: February 17, 2004Assignee: Sauer-Danfoss Holding A/SInventors: Mogens Blanke, Jesper Sandberg Thomsen, John Kristensen, Torben Frederiksen
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Patent number: 6688419Abstract: 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: GrantFiled: November 28, 2001Date of Patent: February 10, 2004Assignee: Sauer-Danfoss Holding A/SInventors: Uffe Lykke Eriksen, Welm Friedrichsen
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Patent number: 6684975Abstract: 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: GrantFiled: December 26, 2001Date of Patent: February 3, 2004Assignee: Sauer-Danfoss Holding A/SInventor: Tom Rudolph
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Patent number: 6672854Abstract: 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: GrantFiled: June 14, 2002Date of Patent: January 6, 2004Assignee: Sauer-Danfoss Holding A/SInventors: Axel Patsch, Tage Christiansen, Hans Christian Petersen, Jørgen Pedersen
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Patent number: 6668967Abstract: 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: GrantFiled: December 27, 2000Date of Patent: December 30, 2003Assignee: Sauer-Danfoss Holding A/SInventors: Ole Vincentz Sørensen, Svend Giversen, Lars Mortensen, Johan van Beek
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Patent number: 6655492Abstract: 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: GrantFiled: December 26, 2001Date of Patent: December 2, 2003Assignee: Sauer-Danfoss Holding A/SInventors: Torben Juul, Tom Rudolph
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Patent number: 6654675Abstract: 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: GrantFiled: August 19, 2002Date of Patent: November 25, 2003Assignee: Sauer-Danfoss Holding A/SInventors: Søren Pedersen, Per Nielsen Lindholdt, Welm Friedrichsen, Asger Flintholm
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Patent number: 6629020Abstract: A control device for the position (x) of a valve slide (3), with a d.c. voltage (UB) operated set point transmitter (11), which produces a set point value (Uw) proportional to the position (w) of a control lever (10) and the operating d.c. voltage (UB), with an actual value transmitter (15) operated with the same d.c. voltage (UB) as the set point transmitter (11), which produces an actual value signal (Ux) proportional to the position (x) of the valve slide (3) and the operating d.c. voltage (UB), the proportionality factors (k1, k2) being equal to the dependence of the set point and actual value signals (Uw, Ux) on the position (x) of the valve slide (3) or the position (w) of the control lever (10), respectively, and on the operating d.c.Type: GrantFiled: April 3, 2000Date of Patent: September 30, 2003Assignee: Sauer-Danfoss Holding A/SInventor: Flemming Thomsen
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Patent number: 6619937Abstract: The invention concerns a hydraulic machine (1) with a tooth set (2), having a gear wheel (3), which is arranged to be rotating and orbiting in a toothed ring (4), the tooth set (2) being arranged between two plates (10, 11) in the axial direction. It is desired to extend the life of such a machine, also when operated with an impurified hydraulic fluid. For this purpose, at least a section (9′) of the circumferential surface of one of the two components, toothed ring (4) and gear wheel (3), is made of a material, which is substantially harder than the material of the part of the other component, gear wheel (3) and toothed ring (4), bearing on this section.Type: GrantFiled: June 12, 2002Date of Patent: September 16, 2003Assignee: Sauer-Danfoss Holding A/SInventors: Welm Friedrichsen, Hans-Erik Kiil, Claus Tjørnly Rasmussen
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Patent number: 6595314Abstract: A hydraulic steering system (1) for a vehicle with two steering motor arrangements, particularly an articulated vehicle with wheel steering, with a hydraulic steering unit (2) having a measuring motor section (22, 23), with a selection valve (6), which connects an outlet (L, R) of the steering unit (2) with either a first steering motor arrangement (7) that preferably acts upon steered wheels, or a second steering motor arrangement (9) that preferably acts upon a converting kit, and which is hydraulically operable via a pilot valve (14), and with a pump (4), which is connected with the steering unit (2) and the pilot valve (14). This permits the vehicle to be steerable in connection with an emergency.Type: GrantFiled: December 26, 2001Date of Patent: July 22, 2003Assignee: Sauer-Danfoss Holding A/SInventors: Torben Juul, Tom Rudolph, Jørgen Clausen
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Patent number: 6581717Abstract: A hydraulic steering arrangement with a steering handwheel which is connected with a hydraulic steering unit, and with a steering motor connected with a pump via a steering valve. In a steering arrangement of this kind, a simple construction is desired, though under maintenance of the required security. For this purpose, the steering valve can optionally be operated by a steering handwheel or by a hydraulic pressure generated by a control pressure generator.Type: GrantFiled: January 17, 2001Date of Patent: June 24, 2003Assignee: Sauer Danfoss Holding A/SInventors: Ole Vincentz Sørensen, John Børsting, Lars Mortensen, John Kristensen, Peter Peistrup
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Patent number: 6572353Abstract: A hydraulic motor has a housing with an inner toothed ring, and an outer toothed wheel eccentrically mounted within the ring, with pressure pocket space between the teeth of the ring and the wheel. The wheel is eccentrically rotatably and orbitally mounted within the ring. A rotary slide valve is mounted within the wheel. A valve plate with an open center is adjacent the wheel. A rotary slide valve is positioned within the open center of the valve plate. Fluid under pressure in passageways is provided to a front group of pressure pocket spaces to cause the wheel to rotate. An output shaft is operatively connected to the wheel.Type: GrantFiled: November 16, 2001Date of Patent: June 3, 2003Assignee: Sauer-Danfoss Holding A/SInventor: Gunnar L. Hansen
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Publication number: 20030094202Abstract: 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: ApplicationFiled: November 13, 2002Publication date: May 22, 2003Applicant: Sauer-Danfoss Holding A/SInventors: Poul Erik Hansen, Svend Erik Thomsen, Thorkild Christensen