Patents by Inventor Holger Pieper

Holger Pieper 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: 9759100
    Abstract: A device for changing the relative angular position of a camshaft with respect to a crankshaft of an internal combustion engine, wherein the drive element is rotatably mounted with respect to the crankshaft and is driven by the camshaft. Between the drive element and the camshaft at least two hydraulic chambers are formed, wherein the hydraulic chambers can be pressurized with a pressurized fluid in order to set a defined relative rotational position between the drive element and the camshaft. The device includes a housing element, wherein a pressure reservoir having a pressure chamber for pressurized fluid is arranged on the housing element and wherein the basic form of the pressure reservoir is substantially cylindrical.
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: September 12, 2017
    Assignees: Volkswagen AG, Schaeffler Technologies AG & Co. KG
    Inventors: Ali Bayrakdar, Uwe Elfers, Thomas Mueller, Holger Pieper
  • Patent number: 9587524
    Abstract: A device for changing the relative angular position of a camshaft with respect to a crankshaft of an internal combustion engine, wherein the drive element is rotatably mounted with respect to the crankshaft and is driven by the camshaft. Between the drive element and the camshaft at least two hydraulic chambers are formed, wherein the hydraulic chambers can be pressurized with a pressurized fluid in order to set a defined relative rotational position between the drive element and the camshaft. The device includes a housing element, wherein a pressure reservoir having a pressure chamber for pressurized fluid is arranged on the housing element and wherein the basic form of the pressure reservoir is substantially cylindrical.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: March 7, 2017
    Assignees: Volkswagen AG, Schaeffer Technologies AG & Co. KG
    Inventors: Ali Bayrakdar, Uwe Elfers, Thomas Mueller, Holger Pieper
  • Publication number: 20150315938
    Abstract: A device for changing the relative angular position of a camshaft with respect to a crankshaft of an internal combustion engine, wherein the drive element is rotatably mounted with respect to the crankshaft and is driven by the camshaft. Between the drive element and the camshaft at least two hydraulic chambers are formed, wherein the hydraulic chambers can be pressurized with a pressurized fluid in order to set a defined relative rotational position between the drive element and the camshaft. The device includes a housing element, wherein a pressure reservoir having a pressure chamber for pressurized fluid is arranged on the housing element and wherein the basic form of the pressure reservoir is substantially cylindrical.
    Type: Application
    Filed: July 10, 2015
    Publication date: November 5, 2015
    Inventors: Ali Bayrakdar, Uwe Elfers, Thomas Mueller, Holger Pieper
  • Publication number: 20130055979
    Abstract: A device for changing the relative angular position of a camshaft with respect to a crankshaft of an internal combustion engine, wherein the drive element is rotatably mounted with respect to the crankshaft and is driven by the camshaft. Between the drive element and the camshaft at least two hydraulic chambers are formed, wherein the hydraulic chambers can be pressurized with a pressurized fluid in order to set a defined relative rotational position between the drive element and the camshaft. The device includes a housing element, wherein a pressure reservoir having a pressure chamber for pressurized fluid is arranged on the housing element and wherein the basic form of the pressure reservoir is substantially cylindrical.
    Type: Application
    Filed: February 8, 2011
    Publication date: March 7, 2013
    Applicants: Schaeffler Technologies AG & Co. KG, Volkswagen AG
    Inventors: Ali Bayrakdar, Uwe Elfers, Thomas Mueller, Holger Pieper