Patents by Inventor Michael D Gandrud
Michael D Gandrud has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9410544Abstract: In open-circuit hydraulic systems (1), the cross-sections of the supply lines (6) and input valves of the hydraulic pump (3) have to be large, so that sufficient flow flux can be provided. This hinders a reduction of the size of the pump and the whole hydraulic system. It is suggested that the supply flow (7) of a hydraulic pump (3) is charged by a second, charging pump (2), to a mid-pressure level (7). The cross-sections of the supply flow areas can thus be decreased.Type: GrantFiled: October 24, 2012Date of Patent: August 9, 2016Assignee: Danfoss Power Solutions ApSInventors: Onno Kuttler, Luke Wadsley, Michael D. Gandrud, Pierre Joly
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Patent number: 9188114Abstract: In open-circuit hydraulic systems (1), the cross-sections of the supply lines (6) and input valves of the hydraulic pump (3) have to be large, so that sufficient flow flux can be provided. This hinders a reduction of the size of the pump and the whole hydraulic system. It is suggested that the supply flow (7) of a hydraulic pump (3) is charged by a second, charging pump (2), to a mid-pressure level (7). The cross-sections of the supply flow areas can thus be decreased.Type: GrantFiled: October 30, 2008Date of Patent: November 17, 2015Assignee: Danfoss Power Solutions ApSInventors: Onno Kuttler, Luke Wadsley, Michael D. Gandrud, Pierre Joly
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Patent number: 8469677Abstract: A hydraulic power unit having a power shaft that rotates a cam. The cam actuates a piston assembly that contains a plurality of pistons wherein each piston has a piston body and fluid working chamber. An electrically actuated bypass valve is fluidly connected and in communication between an outlet check valve and a fluid working chamber of each piston such that when actuated the electrically actuated bypass valve directs fluid away from the outlet port into a reservoir to be returned to an inlet port.Type: GrantFiled: October 1, 2007Date of Patent: June 25, 2013Assignee: Sauer-Danfoss Inc.Inventor: Michael D. Gandrud
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Patent number: 7640897Abstract: A method of cooling a radiator in an internal combustion engine wherein a plurality of fan assemblies is provided. Specifically, each fan assembly has a housing with an interior containing a fan blade and an exterior having six sides to form a hexagonal perimeter. The fan assemblies are then arranged side by side to form a cluster of fan assemblies in order to maximize the amount of fan assemblies that may be provided on an enclosure. The cluster of fan assemblies is then placed adjacent to a radiator to control the air flow over the radiator in order to cool the engine.Type: GrantFiled: November 9, 2007Date of Patent: January 5, 2010Assignee: Sauer-Danfoss, Inc.Inventors: Michael D. Gandrud, Chad J. Daniel, Simon L. Nielsen, Jeff L. Herrin
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Publication number: 20090263258Abstract: A hydraulic power unit that uses a quantity of media within a cavity adjacent to and surrounding a hydraulic assembly in the housing of the hydraulic power unit to reduce the overall noise of the unit. Additionally, the cavity either seals the media from the moving parts of the hydraulic assembly or isolates the media from the moving parts of the hydraulic assembly to ensure damage to the hydraulic assembly does not result.Type: ApplicationFiled: February 27, 2007Publication date: October 22, 2009Applicant: SAUER-DANFOSS INC.Inventor: Michael D. Gandrud
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Patent number: 7594377Abstract: An assembly having a frame supported by a plurality of ground engaging wheels. Mounted to the frame is an operator control system that is connected to a controller that is powered by an electrical source. The controller is operatively connected to a blade assembly and a ground drive assembly and adjusts the ground speed of the assembly based upon the cutting load of the blade.Type: GrantFiled: October 27, 2006Date of Patent: September 29, 2009Assignee: Sauer-Danfoss Inc.Inventors: Lynn T. Jansen, Michael D. Gandrud
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Publication number: 20090113888Abstract: In open-circuit hydraulic systems (1), the cross-sections of the supply lines (6) and input valves of the hydraulic pump (3) have to be large, so that sufficient flow flux can be provided. This hinders a reduction of the size of the pump and the whole hydraulic system. It is suggested that the supply flow (7) of a hydraulic pump (3) is charged by a second, charging pump (2), to a mid-pressure level (7). The cross-sections of the supply flow areas can thus be decreased.Type: ApplicationFiled: October 30, 2008Publication date: May 7, 2009Applicant: Sauer-Danfoss ApSInventors: Onno Kuttler, Luke Wadsley, Michael D. Gandrud, Pierre Joly
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Publication number: 20090091301Abstract: An operating system for an electric motor associated with a hydraulic pump for moving a load and method of operating the same. The operating system includes a power source that is electrically connected to the electric motor wherein a capacitor charge and discharge circuit is used in association with a capacitor in order to store energy within the capacitor as the operating system is in use.Type: ApplicationFiled: October 8, 2007Publication date: April 9, 2009Applicant: Sauer-Danfoss Inc.Inventors: Michael D. Gandrud, Jeff Herrin
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Publication number: 20090038564Abstract: A method of cooling a radiator in an internal combustion engine wherein a plurality of fan assemblies is provided. Specifically, each fan assembly has a housing with an interior containing a fan blade and an exterior having six sides to form a hexagonal perimeter. The fan assemblies are then arranged side by side to form a cluster of fan assemblies in order to maximize the amount of fan assemblies that may be provided on an enclosure. The cluster of fan assemblies is then placed adjacent to a radiator to control the air flow over the radiator in order to cool the engine.Type: ApplicationFiled: November 9, 2007Publication date: February 12, 2009Applicant: SAUER-DANFOSS INC.Inventors: Michael D. Gandrud, Chad J. Daniel, Simon L. Nielsen, Jeff L. Herrin
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Patent number: 7317290Abstract: AC inverters that are electrically connected to a direct current source to convert the direct current source such that the transistor power module of an inverter can power a plurality of AC motors wherein the motors can be located remote from the inverters or within the inverter housings.Type: GrantFiled: December 29, 2004Date of Patent: January 8, 2008Assignee: Sauer-Danfoss Inc.Inventors: Michael D Gandrud, Torben Frederiksen, Jeff Herrin
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Patent number: 7316115Abstract: A system for operating a hydromechanical transmission having a movable input member that transmits a signal to a control unit that uses predefined logic to determine if a hydrostatic transmission should be in a first low speed mode that uses displacement control or if it should be in a second high speed mode that uses a power, torque, or speed control scheme.Type: GrantFiled: January 5, 2005Date of Patent: January 8, 2008Assignee: Sauer-Danfoss Inc.Inventors: Lynn T Jansen, Michael D. Gandrud
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Patent number: 7300260Abstract: A positive displacement piston unit is provided that utilizes a magnetorheological (MR) or electrorheological (ER) fluid as the transmission fluid. Each cylinder of the invention has an intake port connected to the suction port of the hydrostatic pump and an output port connected to the pressure port. Flow of the transmission fluid through the cylinder is controlled by an electromagnet or electrode located in close proximity to the intake and output ports of the cylinder. By energizing the electromagnet or electrode, the viscosity of the transmission fluid can be increased such that the portion of the fluid immediately near the electromagnet or electrode substantially solidifies. The solidified portion of the transmission fluid disables fluid through the particular passage, thereby restricting flow of the transmission fluid to the cylinder. As such, the present invention does not require the use of mechanical cylinder valves to control the flow of the transmission fluid.Type: GrantFiled: October 31, 2003Date of Patent: November 27, 2007Assignee: Sauer-Danfoss Inc.Inventor: Michael D Gandrud
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Patent number: 7182583Abstract: An electro-hydraulic power unit is disclosed that includes a housing filled with hydraulic fluid. A hydraulic power unit is disposed within the housing, the power unit having a mechanical power shaft. Additionally, an electric machine is disposed within the housing adjacent to the hydraulic power unit, the electric machine having a rotor secured to the mechanical power shaft of the hydraulic power unit. Hydraulic fluid within the housing passes over the electric machine, thus cooling the electric machine and providing for improved efficiency and performance.Type: GrantFiled: August 26, 2004Date of Patent: February 27, 2007Assignee: Sauer-Danfoss Inc.Inventors: Michael D. Gandrud, Torben Frederiksen, Hans Esders
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Patent number: 7111458Abstract: A loop flushing circuit in a closed circuit hydraulic system has a variable displacement hydraulic pump that is fluidly connected to a hydraulic motor. The flushing flow in the closed circuit is controlled by an electronically proportional flow control valve. The electronically proportional flow control valve is controlled by a control that ensures that the control valve being used is connected to a low pressure side of the closed loop flushing circuit.Type: GrantFiled: July 11, 2003Date of Patent: September 26, 2006Assignee: Sauer-Danfoss Inc.Inventor: Michael D. Gandrud
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Patent number: 7038339Abstract: 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: GrantFiled: March 31, 2004Date of Patent: May 2, 2006Assignee: Sauer-Danfoss Inc.Inventor: Michael D. Gandrud
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Patent number: 7011113Abstract: 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: GrantFiled: March 4, 2004Date of Patent: March 14, 2006Assignee: SAuer-Danfoss Inc.Inventor: Michael D. Gandrud
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Patent number: 6931847Abstract: A priority circuit is provided that is in communication with an open circuit pump and priority and auxiliary systems. The circuit comprises a first valve with an inlet in communication with the pump, an outlet in communication the priority system, and a load sensing inlet in communication with the priority system, wherein the first valve modulates to maintain a predetermined pressure differential between pressure at the load sensing inlet and pressure at the outlet. The circuit further comprises a second valve with an inlet in communication with the pump, an outlet in communication with the auxiliary system, and a load sensing inlet in communication with the priority system, wherein the second valve is normally closed and opens when pressure at the load sensing inlet of the second valve is less than pressure at the inlet of the second valve minus the predetermined pressure differential of the first valve.Type: GrantFiled: March 4, 2004Date of Patent: August 23, 2005Assignee: Sauer-Danfoss, Inc.Inventors: Charles D. Throckmorton, Michael D. Gandrud, Jimmy W. Bolinger
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Patent number: 6925892Abstract: The present invention is directed towards a hydraulic power unit including a housing, an internal hydraulic power means, an external hydraulic power means, and a mechanical power shaft associated with the hydraulic power means. In addition, the hydraulic power unit comprises a transducer adapted for measuring torque mounted in the housing in a non-contact relation to the mechanical power shaft adjacent a portion of the shaft imposed with a magnetic field. The hydraulic power unit further comprises a controller associated with the transducer to monitor the measured torque and adjust the operation of the hydraulic power unit accordingly.Type: GrantFiled: December 17, 2003Date of Patent: August 9, 2005Assignee: Sauer-Danfoss, Inc.Inventor: Michael D Gandrud
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Patent number: 6817253Abstract: A hydraulic power unit in a housing has a power shaft associated with the power unit. A transducer adapted for measuring torque is mounted in the housing. A stationary portion of the transducer is mounted in non-contact relation to the shaft. A method for measuring torque in the power unit involves placing the transducer in the position described.Type: GrantFiled: March 14, 2002Date of Patent: November 16, 2004Assignee: Sauer-Danfoss Inc.Inventor: Michael D. Gandrud
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Patent number: 6750621Abstract: The present invention discloses a system for non-contact measurement of vibrational motion in a vibratory compacting machine. The system includes a vibrating element such as a roller drum adapted for vibrational motion and a non-contact sensor positioned a distance from the vibrating element and adapted for sensing the vibrational motion of the vibrating element. The present invention also discloses a method for non-contact measurement of vibrational motion of a vibrating element in a vibrating element that includes sensing position information of the roller drum with a non-contact sensor positioned a distance from the vibrating element and determining at least one vibration characteristic based on the position information sensed with the non-contact sensor.Type: GrantFiled: September 10, 2001Date of Patent: June 15, 2004Assignee: Sauer-Danfoss Inc.Inventor: Michael D. Gandrud