Patents by Inventor Gerd Wiessner

Gerd Wiessner 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).

  • Device for altering the control timing of gas exchange valves of an internal combustion engine, especially an apparatus for hydraulic rotational angle adjustment of a camshaft relative to a crankshaft
    Patent number: 6619248
    Abstract: A device (1) for hydraulic rotational angle adjustment of a camshaft relative to a crankshaft of an internal combustion engine including a drive unit (4) connected with the crankshaft and an output unit (5) non-rotatably connected with the camshaft. The drive unit (4) stands in power transmitting connection with the output unit (5) through at least two pressure chambers (6, 7) formed inside the device (1) which bring about, under action by pressure under continuous compensation for external pressure leakages, a relative rotation or a hydraulic clamping of the output unit (5) in relation to the drive unit (4). In addition, the device (1) has a coil spring (8) arranged outside the device which is provided for adaptation of its adjustment speeds in both adjustment directions.
    Type: Grant
    Filed: July 12, 2002
    Date of Patent: September 16, 2003
    Assignee: INA-Schaeffler KG
    Inventors: Thomas Bertelshofer, Gerd Wiessner, Jurgen Schwab, Thomas Kleiber