Patents by Inventor Alexander Dreher
Alexander Dreher 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: 10663044Abstract: The disclosure relates to an actuator having a planetary roller screw drive comprising a housing having a cylinder chamber and a fluid reservoir forming one common volume and the housing is filled with a hydraulic fluid. The planetary roller screw drive comprises a spindle having a profiling, which meshes with a plurality of planetary rollers, which are arranged around the spindle and are supported at both ends in a planetary roller carrier. The planetary rollers mesh with an inner profiling of an internal ring gear surrounding the planetary rollers and the planetary rollers are supported in a sleeve surrounding the internal ring gear. According to the disclosure, the planetary roller carrier and/or the sleeve comprise one or more flow ducts connecting the interior and the exterior of a chamber defined radially by the sleeve and axially by the planetary roller carriers to one another.Type: GrantFiled: March 14, 2016Date of Patent: May 26, 2020Assignee: SCHAEFFLER TECHNOLOGIES AG & CO. KGInventors: Peter Greb, Alexander Dreher, Lars Schumann, Lászlo Mán
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Publication number: 20180340597Abstract: The disclosure relates to an actuator having a planetary roller screw drive comprising a housing having a cylinder chamber and a fluid reservoir forming one common volume and the housing is filled with a hydraulic fluid. The planetary roller screw drive comprises a spindle having a profiling, which meshes with a plurality of planetary rollers, which are arranged around the spindle and are supported at both ends in a planetary roller carrier. The planetary rollers mesh with an inner profiling of an internal ring gear surrounding the planetary rollers and the planetary rollers are supported in a sleeve surrounding the internal ring gear. According to the disclosure, the planetary roller carrier and/or the sleeve comprise one or more flow ducts connecting the interior and the exterior of a chamber defined radially by the sleeve and axially by the planetary roller carriers to one another.Type: ApplicationFiled: March 14, 2016Publication date: November 29, 2018Applicant: Schaeffler Technologies AG & Co. KGInventors: Peter Greb, Alexander Dreher, Lars Schumann, Lászlo Mán
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Patent number: 10125851Abstract: A spindle drive unit, in particular for an actuator having a planetary screw drive (PWG) for actuating a clutch of a motor vehicle by an actuating element is provided, where the drive unit has an e-motor with a rotor and a stator and where a spindle provided with a pitch is connected non-rotatingly to the rotor and is drivable by the rotor around an axis of rotation. The spindle is designed as a threaded rod and a rotor carrier that holds the rotor is screwed onto the threaded rod, and the rotor carrier is rotationally secured and axially fixed on the spindle by a lock nut.Type: GrantFiled: November 3, 2014Date of Patent: November 13, 2018Assignee: Schaeffler Technologies AG & Co. KGInventors: Lars Schumann, Lazlo Man, Peter Greb, Alexander Dreher
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Patent number: 10107308Abstract: A piston-cylinder unit (40) for hydraulic actuation of a clutch in a vehicle, including a piston (42), a cylinder (41) and a sealing element (43). The piston cylinder unit is fluidically linked to a fluid circuit (44), the piston (42) is axially displaceable in the cylinder, and the sealing element is arranged sealingly between the piston and the cylinder, characterized in that a sensor is arranged in or on the piston-cylinder unit, by which sensor a pressure can be measured in the interior of the piston-cylinder unit and/or in the fluidically linked fluid circuit. A method for operating the piston-cylinder unit is also provided.Type: GrantFiled: October 16, 2014Date of Patent: October 23, 2018Assignee: SCHAEFFLER TECHNLOGIES AG & CO. KGInventors: Alexander Dreher, Marco Treder
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Publication number: 20170108056Abstract: A modular concept is proposed for an actuator, in particular a clutch and/or transmission actuator. An electric motor is provided with a universal flange. Through this flange it is possible to connect an electrohydraulic or electromechanical actuating link. A clutch and/or a transmission setting device can then be actuated by means of the resulting actuator. In particular, for use for an electrohydraulic actuator, the motor housing may also have a receptacle for a pressure sensor. This receptacle may already be closed, or may be closed for the connection to a mechanics module.Type: ApplicationFiled: March 13, 2015Publication date: April 20, 2017Inventors: Peter Greb, Lászlo Mán, Lars Schumann, Alexander Dreher
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Publication number: 20160290455Abstract: A spindle drive unit, in particular for an actuator having a planetary screw drive (PWG) for actuating a clutch of a motor vehicle by an actuating element is provided, where the drive unit has an e-motor with a rotor and a stator and where a spindle provided with a pitch is connected non-rotatingly to the rotor and is drivable by the rotor around an axis of rotation. The spindle is designed as a threaded rod and a rotor carrier that holds the rotor is screwed onto the threaded rod, and the rotor carrier is rotationally secured and axially fixed on the spindle by a lock nut.Type: ApplicationFiled: November 3, 2014Publication date: October 6, 2016Applicant: Schaeffler Technologies AG & Co., KGInventors: Lars Schumann, Lazlo Man, Peter Greb, Alexander Dreher
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Publication number: 20160195112Abstract: A piston-cylinder unit (40) for hydraulic actuation of a clutch in a vehicle, including a piston (42), a cylinder (41) and a sealing element (43). The piston cylinder unit is fluidically linked to a fluid circuit (44), the piston (42) is axially displaceable in the cylinder, and the sealing element is arranged sealingly between the piston and the cylinder, characterized in that a sensor is arranged in or on the piston-cylinder unit, by which sensor a pressure can be measured in the interior of the piston-cylinder unit and/or in the fluidically linked fluid circuit. A method for operating the piston-cylinder unit is also provided.Type: ApplicationFiled: October 16, 2014Publication date: July 7, 2016Applicant: Schaeffler Technologies AG & Co. KGInventors: Alexander Dreher, Marco Treder
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Patent number: 8220606Abstract: The invention relates to a dual clutch transmission with two friction clutches and a method for controlling it, where the two friction clutches are actuated utilizing electromechanical disengaging units. To counteract lockup of the dual clutch transmission in the event of a failure of an electric motor, the functional capability of the electric motors is monitored. If the function of an electric motor is deficient, a signal is generated in the control device that brings about in the program sequence of the transmission control system a disengagement of all of the gears that are situated in a sub-drivetrain whose friction clutch is actuated by the affected electric motor. In this way it is possible to prevent lockup of the dual clutch transmission during a malfunction of an electric motor during a state in which torque is being transmitted to the sub-drivetrain.Type: GrantFiled: November 10, 2008Date of Patent: July 17, 2012Assignee: Schaeffler Technologies AG & Co. KGInventor: Alexander Dreher
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Patent number: 8201679Abstract: An actively closed friction clutch actuated by a lever actuator and having an adjusting means, the lever actuator taking the form of a roller displaced radially by a spindle, which roller acts on a unilaterally suspended lever, the latter being displaced axially and acting axially on a clamping means such as a lever, lever spring or diaphragm spring. The adjusting means for compensating friction lining wear is enabled by an end stop position widened axially relative to a stop position of the lever, which end stop position is enabled by means of an engageable/disengageable stop. To distinguish the two stop positions, the force/travel characteristic line of the lever actuator is detected by the controller of the lever actuator.Type: GrantFiled: March 5, 2009Date of Patent: June 19, 2012Assignee: Schaeffler Technologies AG & Co. KGInventors: Dirk Burkhart, Alexander Dreher
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Patent number: 8100812Abstract: The invention relates to a process for controlling an automated friction clutch with a wear adjustment device that adjusts extended clutch stroke by a discrete magnitude through the wear of friction lining at maximum transmittable torque of the friction clutch. To guarantee safe self-adjustment, also during a long operation period under the maximum clutch torque, under specified preconditions, for instance, during the start of the internal combustion engine and without gear engagement, the friction clutch is closed for maximum clutch torque.Type: GrantFiled: April 3, 2009Date of Patent: January 24, 2012Assignee: Schaeffler Technologies GmbH & Co. KGInventors: Laszlo Man, Alexander Dreher, Dirk Burkhart
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Publication number: 20090258757Abstract: The invention relates to a process for controlling an automated friction clutch with a wear adjustment device that adjusts extended clutch stroke by a discrete magnitude through the wear of friction lining at maximum transmittable torque of the friction clutch. To guarantee safe self-adjustment, also during a long operation period under the maximum clutch torque, under specified preconditions, for instance, during the start of the internal combustion engine and without gear engagement, the friction clutch is closed for maximum clutch torque.Type: ApplicationFiled: April 3, 2009Publication date: October 15, 2009Applicant: LUK LAMELLEN UND KUPPLUNGSBAU BETEILIGUNGS KGInventors: Laszlo Man, Alexander Dreher, Dirk Burkhart
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Publication number: 20090223772Abstract: An actively closed friction clutch actuated by a lever actuator and having an adjusting means, the lever actuator taking the form of a roller displaced radially by a spindle, which roller acts on a unilaterally suspended lever, the latter being displaced axially and acting axially on a clamping means such as a lever, lever spring or diaphragm spring. The adjusting means for compensating friction lining wear is enabled by an end stop position widened axially relative to a stop position of the lever, which end stop position is enabled by means of an engageable/disengageable stop. To distinguish the two stop positions, the force/travel characteristic line of the lever actuator is detected by the controller of the lever actuator.Type: ApplicationFiled: March 5, 2009Publication date: September 10, 2009Applicant: LuK Lamellen und Kupplungsbau Beteiligungs KGInventors: Dirk Burkhart, Alexander Dreher
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Publication number: 20090186742Abstract: The invention relates to a dual clutch transmission with two friction clutches and a method for controlling it, where the two friction clutches are actuated by means of electromechanical disengaging units. To counteract lockup of the dual clutch transmission in the event of a failure of an electric motor, the functional capability of the electric motors is monitored. If the function of an electric motor is deficient or lacking, a signal is generated in the control device that brings about in the program sequence of the transmission control system a disengagement of all of the gears that are situated in a sub-drivetrain whose friction clutch is actuated by the affected electric motor. In this way it is possible to prevent lockup of the dual clutch transmission during a malfunction of an electric motor during a state in which torque is being transmitted to the sub-drivetrain, even if the disengaging device is of self-holding design or is locked up during the malfunction.Type: ApplicationFiled: November 10, 2008Publication date: July 23, 2009Applicant: LuK Lamellen und Kupplungsbau Beteiligungs KGInventor: Alexander Dreher