Patents by Inventor Thomas Aisenpreis

Thomas Aisenpreis 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).

  • Hydraulic circuit arrangement for operating a hydrodynamic torque converter
    Patent number: 8172053
    Abstract: A hydraulic circuit arrangement for operating a hydrodynamic torque converter (1, 10) with a converter bridging clutch (11). The circuit arrangement comprises a hydraulic switching unit (3, 14) having at least one valve for controlling an inflow flow and a return flow of oil to the converter (1, 10) and the converter bridging clutch (11), an oil cooler (4, 15), a first line (5, 12) for acting upon the converter bridging clutch (11) with an engagement pressure (PWKzu) and a second line (6, 13) for acting upon the converter bridging clutch (11) with a disengagement pressure (PWKauf). The circuit arrangement comprises a bypass line (8, 17) which is connected directly with the oil cooler (4, 15) so as to bypass the hydraulic switching unit (3, 14).
    Type: Grant
    Filed: May 18, 2009
    Date of Patent: May 8, 2012
    Assignee: ZF Friedrichshafen AG
    Inventors: Horst Leichsenring, Berron Hairston, Jochen Birkle, Thomas Aisenpreis
  • HYDRAULIC CIRCUIT ARRANGEMENT FOR OPERATING A HYDRODYNAMIC TORQUE CONVERTER
    Publication number: 20090298647
    Abstract: A hydraulic circuit arrangement for operating a hydrodynamic torque converter (1, 10) with a converter bridging clutch (11). The circuit arrangement comprises a hydraulic switching unit (3, 14) having at least one valve for controlling an inflow flow and a return flow of oil to the converter (1, 10) and the converter bridging clutch (11), an oil cooler (4, 15), a first line (5, 12) for acting upon the converter bridging clutch (11) with an engagement pressure (PWKzu) and a second line (6, 13) for acting upon the converter bridging clutch (11) with a disengagement pressure (PWKauf). The circuit arrangement comprises a bypass line (8, 17) which is connected directly with the oil cooler (4, 15) so as to bypass the hydraulic switching unit (3, 14).
    Type: Application
    Filed: May 18, 2009
    Publication date: December 3, 2009
    Applicant: ZF FRIEDRICHSHAFEN AG
    Inventors: Horst LEICHSENRING, Berron Hairston, Jochen Birkle, Thomas Aisenpreis