Patents by Inventor Rolf Frech

Rolf Frech 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).

  • Hybrid vehicle
    Patent number: 8006787
    Abstract: In a hybrid vehicle having at least one electric motor which is usable as a generator and charges a vehicle battery during a recuperation phase, there is provided an additional actuating element independent of a brake system which is used to transfer the electric motor into its recuperation state without activating the brake system. Alternatively, the additional actuating element may operate in conjunction with the brake system, such that the brake pedal may also be used to transfer the electric motor into its recuperation state.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: August 30, 2011
    Assignee: Dr. Ing. h.c.F. Porsche Aktiengesellschaft
    Inventors: Rolf Frech, Markus Goehring
  • Hybrid Vehicle
    Publication number: 20090029823
    Abstract: In a hybrid vehicle having at least one electric motor which is usable as a generator and charges a vehicle battery during a recuperation phase, there is provided an additional actuating element independent of a brake system which is used to transfer the electric motor into its recuperation state without activating the brake system. Alternatively, the additional actuating element may operate in conjunction with the brake system, such that the brake pedal may also be used to transfer the electric motor into its recuperation state.
    Type: Application
    Filed: July 7, 2008
    Publication date: January 29, 2009
    Applicant: Dr. Ing. h.c.F. Porsche Aktiengesellschaft
    Inventors: Rolf FRECH, Markus Goehring
  • Arrangement for the tensioning and adjusting of a camshaft chain drive
    Patent number: 5120278
    Abstract: An internal-combustion engine has a camshaft drive in which the outlet camshaft driven by the crankshaft drives the inlet camshaft via a chain. For the tensioning of the chain, two hydraulic pistons are pressed in opposite directions with respect to one another against the loose end and the load end of the interior side of the chain. For adjustment of the relative camshaft rotating position, the unit consisting of the hydraulic piston and the chain is shifted transversely to the camshafts so that the loose end is shortened and the load end is lengthened, or vice versa.
    Type: Grant
    Filed: March 4, 1991
    Date of Patent: June 9, 1992
    Assignees: Dr. Ing. h.c.F. Porsche AG, Hydraulik-Ring GmbH
    Inventors: Alfred Trzmiel, Wolfgang Stephan, Johann-Georg Ulrich, Rolf Frech, Freidhelm Hage