Patents by Inventor Gerd Pidde

Gerd Pidde 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: 5709628
    Abstract: A hydrostatic transmission has at least one pump, first and second motors connected to and driven by the pump and having respective first and second motor shafts, and a planetary-gear drive. This drive has a sun gear connected permanently to the first motor shaft, planet gears in mesh with the sun gear, a planet carrier carrying the planet gears and forming an output, and a ring gear meshing with the planet gears. First gearing and a first clutch are connected between the motor shafts and a brake connected to the ring gear is actuatable to arrest same. A second clutch is connected between the second motor shaft and the ring gear. In a first range the first clutch is closed, the second clutch is opened, and the brake is actuated to drive the sun gear with both shafts with the ring gear stopped. In a second range the first clutch is opened, the second clutch is closed, and the brake is released to drive the sun gear with the one shaft and the ring gear with the other shaft.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: January 20, 1998
    Inventors: Gerd Pidde, Detlef Tolksdorf