Patents by Inventor Christoph Margraf

Christoph Margraf 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).

  • Patent number: 10759265
    Abstract: A transmission having five planetary gearsets and seven shift elements for achieving various ratios between drive and output shafts. A forward gearset has three shafts. Two intermediate gearsets have four shafts. Two main gearsets have at least four shafts. Depending on the shift states of the second and third shift elements, the forward gearset can generate two rotational speeds at the output side, which transfer from a forward gearset shaft to an intermediate gearset shaft. Depending on the shift states of the first to fifth shift elements, the intermediate gearset can generate eight rotational speeds at the output side, which pass from another intermediate gearset shaft to a main gearset shaft. Depending on the shift states of the seven shift elements, the main gearset can generate up to fourteen forward and two reverse gears at the output side, which are transferred by another main gearset shaft to the output shaft.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: September 1, 2020
    Assignee: ZF FRIEDRICHSHAFEN AG
    Inventors: Peter Ziemer, Kai Bornträger, Christoph Margraf, Stefan Brom, Andreas Beisswenger, Michael Trübenbach, Johannes Glückler
  • Publication number: 20200271213
    Abstract: A shaft (W) for a motor vehicle transmission (G) may have axial bore holes positioned within the shaft and configured to guide fluid within the shaft. The shaft may have first, second, and third axial sections (W1, W2, W3), the second axial section being axially between the first and third axial sections. Fluid enters the axial bore holes in the second axial section and exits the axial bore holes in the first and third axial sections. One of the axial bore holes (B2; B1, B1a) is arranged, at least partially, in the first axial section and is radially spaced from an axis of rotation (WA) of the shaft. Another of the axial bore holes (B1RS; B_SE5, B3a) is arranged, at least partially, in the third axial section. The one of the axial bore holes (B2; B1, B1a) is coaxial with the other of the axial bore holes (B1RS; B_SE5, B3a).
    Type: Application
    Filed: February 20, 2020
    Publication date: August 27, 2020
    Inventors: Christoph Margraf, Carl Schilling, Martin Brehmer, Oliver Angele, Manuel Steinmann, Sebastian Freis, Stefan Benz-Breitweg, Robert Reiser, Christian Staiger, Felix Fink, Tamas Gyarmati
  • Publication number: 20200079206
    Abstract: A transmission having five planetary gearsets and seven shift elements for achieving various ratios between drive and output shafts. A forward gearset has three shafts. Two intermediate gearsets have four shafts. Two main gearsets have at least four shafts. Depending on the shift states of the second and third shift elements, the forward gearset can generate two rotational speeds at the output side, which transfer from a forward gearset shaft to an intermediate gearset shaft. Depending on the shift states of the first to fifth shift elements, the intermediate gearset can generate eight rotational speeds at the output side, which pass from another intermediate gearset shaft to a main gearset shaft. Depending on the shift states of the seven shift elements, the main gearset can generate up to fourteen forward and two reverse gears at the output side, which are transferred by another main gearset shaft to the output shaft.
    Type: Application
    Filed: November 16, 2017
    Publication date: March 12, 2020
    Inventors: Peter ZIEMER, Kai BORNTRÄGER, Christoph MARGRAF, Stefan BROM, Andreas BEISSWENGER, Michael TRÜBENBACH, Johannes GLÜCKLER
  • Publication number: 20200056680
    Abstract: A multi-speed transmission having drive and output shafts, front-mounted planetary gearsets, rear-mounted planetary gearsets and six shift elements. Selective engagement of shift elements selectively renders a drive shaft speed and speeds generated in the front gearsets for achieving a reverse gear and twelve forward gears via the rear gearsets transmissible as an output speed to the output shaft. Four shift elements are assigned to the front gearsets and two are assigned to the rear gearsets. At least one front gearset is rigidly connected to an element of the rear gearsets, resulting in six different output speeds of the front gearsets being transmissible to the rear gearsets. If normalized to the drive shaft input speed, one output speed is smaller than 0, three output speeds are between 0 and 1, one output speed is equal to 1 and one output speed is greater than 1.
    Type: Application
    Filed: October 24, 2017
    Publication date: February 20, 2020
    Inventors: Peter ZIEMER, Kai BORNTRÄGER, Christoph MARGRAF, Andreas BEISSWENGER, Stefan BROM
  • Patent number: 10527108
    Abstract: A rotating shifting element arrangement for an automatic transmission of a vehicle, having a cylinder element (2), is proposed, in which an actuating piston (3) for actuating a shifting element (1) is arranged in an axially movable way, a compensating cavity (4) of the shifting element (1) being provided by way of the actuating piston (3) and an oil dam (5), and wherein the oil dam (5) is fixed radially outside the piston face (6) of the actuating piston (3).
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: January 7, 2020
    Assignee: ZF FRIEDRICHSHAFEN AG
    Inventor: Christoph Margraf
  • Patent number: 10480641
    Abstract: A system for locking and releasing a shifting position of a shifting element that is hydraulically actuatable by an actuating pressure is provided. The shifting element is arranged coaxially with a transmission shaft. The system includes a stop valve. The stop valve is subjectable to a control pressure that is separate from the actuating pressure of the shifting element. The stop valve is arranged radially inside the shifting element in the transmission housing.
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: November 19, 2019
    Assignee: ZF FRIEDRICHSHAFEN AG
    Inventors: Peter Ziemer, Josef Haupt, Christoph Margraf, Markus Herrmann, Thilo Schmidt, Ulrich Doerr, Christian Sibla, Stefan Beck, Maik Wiesner, Stefan Brom
  • Publication number: 20190293153
    Abstract: A multi-speed transmission has drive and output shafts, three front-mounted and two rear-mounted planetary gear sets, and shift elements which can be engaged to selectively implement at least eleven forward gears and one reverse gear. The front gear sets are connected to one element of the rear gear sets. Five shift elements are assigned to the front gear sets and two are assigned to the rear gear sets, such that the front gear sets transmit seven output speeds to the rear gear sets. If normalized to the input speed of the drive shaft, at least one output speed of the front gear sets is less than 0, one output speed is greater than 1, one output speed is equal to 0, one output speed is equal to 1 and two output speeds are between 0 and 1.
    Type: Application
    Filed: November 9, 2017
    Publication date: September 26, 2019
    Inventors: Peter ZIEMER, Kai BORNTRÄGER, Christoph MARGRAF, Andreas BEISSWENGER, Stefan BROM
  • Publication number: 20190293154
    Abstract: A multi-speed transmission having drive and output shafts, three front-mounted and two rear-mounted planetary gearsets, six shift elements which are selectively engaged to render a speed of the drive shaft and speeds generated in the front gearsets to achieve at least one reverse and twelve forward gears via at least one of the rear gearsets transmissible as the output shaft speed. Four shift elements are assigned to the front gearsets and two shift elements are assigned to the rear gearsets. At least one of the front gearsets is fixed to an element of the rear gearsets, resulting in six different output speeds of the front gearsets being transmissible to at least one of the rear gearsets. If normalized to the input speed of the drive shaft, one of the six output speeds is less than 0, four are between 0 and 1, and one is equal to 1.
    Type: Application
    Filed: November 9, 2017
    Publication date: September 26, 2019
    Inventors: Peter ZIEMER, Kai BORNTRÄGER, Christoph MARGRAF, Andreas BEISSWENGER, Stefan BROM
  • Patent number: 10221922
    Abstract: An automatic transmission has a first clutch shaft that constantly connects first and fourth planetary gear sets, a second clutch shaft that constantly connects second and third planetary gear sets, and a third clutch shaft that constantly connects the third and first planetary gear sets. A drive shaft is constantly connected to the fourth planetary gear set; an output shaft is constantly connected to the third planetary gear set. The first planetary gear set is directly connected to two shift elements, the second planetary gear set is directly connected to four shift elements, the third planetary gear set is directly connected to two shift elements, the fourth planetary gear set is directly connected to four shift elements. The drive shaft is directly connected to only one shift element. The output shaft is directly connected to only one shift element. A seventh shift element is directly connected to the drive shaft and the second and fourth planetary gear sets.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: March 5, 2019
    Assignee: ZF FRIEDRICHSHAFEN AG
    Inventors: Josef Haupt, Martin Brehmer, Christoph Margraf, Stefan Beck, Christian Sibla
  • Patent number: 10161509
    Abstract: A hydraulic control device for controlling multiple torque-transferring shift elements of an automatic transmission, where each of the shift elements features at least one hydraulic actuator, which includes one actuating pressure chamber, at least one stop valve and at least one hydraulic shift device with multiple pressure adjusting devices connected to the different shift elements. Thereby, the stop valve is configured and arranged in such a manner that the actuators of at least two shift elements are hydraulically connectable to the pressure adjusting devices through a common stop valve. In a first shifting position, all actuating pressure chambers of the at least two shift elements are tightly sealed by the stop valve. In a second shifting position, all actuating pressure chambers of the at least two shift elements are connected through the stop valve to the pressure adjusting device allocated to the respective shift element.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: December 25, 2018
    Assignee: ZF FRIEDRICHSHAFEN AG
    Inventors: Stefan Beck, Christian Sibla, Christoph Margraf, Peter Ziemer
  • Publication number: 20180080506
    Abstract: A rotating shifting element arrangement for an automatic transmission of a vehicle, having a cylinder element (2), is proposed, in which an actuating piston (3) for actuating a shifting element (1) is arranged in an axially movable way, a compensating cavity (4) of the shifting element (1) being provided by way of the actuating piston (3) and an oil dam (5), and wherein the oil dam (5) is fixed radially outside the piston face (6) of the actuating piston (3).
    Type: Application
    Filed: September 19, 2017
    Publication date: March 22, 2018
    Inventor: Christoph Margraf
  • Publication number: 20180045282
    Abstract: An automatic transmission has a first clutch shaft that constantly connects first and fourth planetary gear sets, a second clutch shaft that constantly connects second and third planetary gear sets, and a third clutch shaft that constantly connects the third and first planetary gear sets. A drive shaft is constantly connected to the fourth planetary gear set; an output shaft is constantly connected to the third planetary gear set. The first planetary gear set is directly connected to two shift elements, the second planetary gear set is directly connected to four shift elements, the third planetary gear set is directly connected to two shift elements, the fourth planetary gear set is directly connected to four shift elements. The drive shaft is directly connected to only one shift element. The output shaft is directly connected to only one shift element. A seventh shift element is directly connected to the drive shaft and the second and fourth planetary gear sets.
    Type: Application
    Filed: October 24, 2017
    Publication date: February 15, 2018
    Inventors: Josef Haupt, Martin Brehmer, Christoph Margraf, Stefan Beck, Christian Sibla
  • Patent number: 9803723
    Abstract: An automatic transmission has a first clutch shaft that constantly connects first and fourth planetary gear sets, a second clutch shaft that constantly connects second and third planetary gear sets, and a third clutch shaft that constantly connects the third and first planetary gear sets. A drive shaft is constantly connected to the fourth planetary gear set; an output shaft is constantly connected to the third planetary gear set. The first planetary gear set is directly connected to two shift elements, the second planetary gear set is directly connected to four shift elements, the third planetary gear set is directly connected to two shift elements, the fourth planetary gear set is directly connected to four shift elements. The drive shaft is directly connected to only one shift element. The output shaft is directly connected to only one shift element.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: October 31, 2017
    Assignee: ZF FRIEDRICHSHAFEN
    Inventors: Josef Haupt, Martin Brehmer, Christoph Margraf, Stefan Beck, Christian Sibla
  • Publication number: 20170268660
    Abstract: A system for locking and releasing a shifting position of a shifting element that is hydraulically actuatable by an actuating pressure is provided. The shifting element is arranged coaxially with a transmission shaft. The system includes a stop valve. The stop valve is subjectable to a control pressure that is separate from the actuating pressure of the shifting element. The stop valve is arranged radially inside the shifting element in the transmission housing.
    Type: Application
    Filed: July 21, 2015
    Publication date: September 21, 2017
    Applicant: ZF Friedrichshafen AG
    Inventors: Peter Ziemer, Josef Haupt, Christoph Margraf, Markus Herrmann, Thilo Schmidt, Ulrich Doerr, Christian Sibla, Stefan Beck, Maik Wiesner, Stefan Brom
  • Patent number: 9726233
    Abstract: A hydraulic system for operating an automatic transmission for motor vehicles includes a hydraulic actuator for operating a clutch and a stop valve, whereas the actuator has a pressurizable actuating pressure chamber, which can be closed in a pressure-tight manner by means of the stop valve, such that the clutch pressure is maintained independent of the other pressures of the hydraulic system. The stop valve includes a closure device that is movable by means of a hydraulic control pressure (p_S) into a closed position, in which an actuating pressure chamber port, and thus the actuating pressure chamber, is closed by means of the closure device. The closure device is movable into an open position at least by means of the force of a spring, in which the actuating pressure chamber port is opened. Thereby, the stop valve features a shiftable locking device, by means of which the closure device can be fixed in the closed position.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: August 8, 2017
    Assignee: ZF Friedrichshafen AG
    Inventors: Christoph Margraf, Stefan Brom
  • Patent number: 9470274
    Abstract: A claw shifting element for a motor vehicle transmission includes a sliding sleeve that is axially fixed in its two end positions by frictional locking.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: October 18, 2016
    Assignee: ZF Friedrichshafen AG
    Inventors: Peter Ziemer, Martin Brehmer, Christoph Margraf, Benjamin Schneider
  • Publication number: 20160230880
    Abstract: A hydraulic control device (101) for controlling multiple torque-transferring shift elements (K_A, K_B, K_C) of an automatic transmission, whereas each of the shift elements features at least one hydraulic actuator (4A, 4B, 4C), which includes one actuating pressure chamber (7A, 7B, 7C), features at least one stop valve (110) and at least one hydraulic shift device (8) with multiple pressure adjusting devices (23A, 23B, 23C) allocated to the different shift elements. Thereby, the stop valve is formed and arranged in such a manner that the actuators of at least two shift elements are hydraulically connectable to the pressure adjusting devices through a common stop valve, whereas, in a first shifting position of the stop valve, all actuating pressure chambers of the at least two shift elements are tightly sealed by the stop valve.
    Type: Application
    Filed: September 17, 2014
    Publication date: August 11, 2016
    Applicant: ZF Friedrichshafen AG
    Inventors: Stefan Beck, Christian Sibla, Christoph Margraf, Peter Ziemer
  • Publication number: 20160230849
    Abstract: The invention relates to a multi-speed automatic transmission in planetary design with one drive shaft (AN), one output shaft (AB), four planetary gear sets (RS1, RS2, RS3, RS4) and several shift elements (A to F). A first clutch shaft (3) constantly connects the first planetary gear set (RS1) to the fourth planetary gear set (RS4), a second clutch shaft (5) constantly connects the second planetary gear set (RS2) to the third planetary gear set (RS3), a third clutch shaft (6) constantly connects the third planetary gear set (RS3) to the first planetary gear set (RS1). The drive shaft (AN) is constantly connected to the fourth planetary gear set (RS4); the output shaft (AB) is constantly connected to the third planetary gear set (RS3).
    Type: Application
    Filed: March 19, 2014
    Publication date: August 11, 2016
    Applicant: ZF Friedrichshafen AG
    Inventors: Josef HAUPT, Martin BREHMER, Christoph MARGRAF, Stefan BECK, Christian SIBLA
  • Publication number: 20160178018
    Abstract: A hydraulic system for operating an automatic transmission for motor vehicles includes a hydraulic actuator for operating a clutch and a stop valve, whereas the actuator has a pressurizable actuating pressure chamber, which can be closed in a pressure-tight manner by means of the stop valve, such that the clutch pressure is maintained independent of the other pressures of the hydraulic system. The stop valve includes a closure device that is movable by means of a hydraulic control pressure (p_S) into a closed position, in which an actuating pressure chamber port, and thus the actuating pressure chamber, is closed by means of the closure device. The closure device is movable into an open position at least by means of the force of a spring, in which the actuating pressure chamber port is opened. Thereby, the stop valve features a shiftable locking device, by means of which the closure device can be fixed in the closed position.
    Type: Application
    Filed: December 16, 2015
    Publication date: June 23, 2016
    Inventors: Christoph Margraf, Stefan Brom
  • Publication number: 20150068344
    Abstract: A claw shifting element (1) comprising a sliding sleeve (3), with which the sliding sleeve (3) is axially fixed in its two end positions by frictional locking, is proposed.
    Type: Application
    Filed: September 12, 2014
    Publication date: March 12, 2015
    Inventors: Peter Ziemer, Martin Brehmer, Christoph Margraf, Benjamin Schneider