Patents by Inventor Ewald Ast

Ewald Ast 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).

  • Method and device for coolant oil feeding to a multiple-disc shifting element of an automatic transmission
    Patent number: 6907973
    Abstract: A system and method for supplying cooling fluid for frictional elements, for example multiple disc clutches and multiple disc brakes, in automatic transmissions. The cooling fluid flows through the multiple disc clutch or brake in a predefined manner radially inward or outward, whereby a defined flow through the clutch or brake packet is ensured through a defined pressure difference in the cooling fluid between the cooling fluid supply and the discharge of the cooling fluid. A preferred embodiment of device for supplying the cooling fluid is designed as a ring-shaped channel that partially or fully encloses the clutch or the brake.
    Type: Grant
    Filed: May 14, 2003
    Date of Patent: June 21, 2005
    Assignee: ZF Freidrichshafen AG
    Inventors: Peter Schiele, Gert Bauknecht, Peter Ziemer, Ulrich Dorr, Ewald Ast
  • System and method for supplying cooling fluid for friction elements in automatic transmissions
    Publication number: 20040003977
    Abstract: A system and method for supplying cooling fluid for frictional elements, for example multiple disc clutches and multiple disc brakes, in automatic transmissions. The cooling fluid flows through the multiple disc clutch or brake in a predefined manner radially inward or outward, whereby a defined flow through the clutch or brake packet is ensured through a defined pressure difference in the cooling fluid between the cooling fluid supply and the discharge of the cooling fluid. A preferred embodiment of device for supplying the cooling fluid is designed as a ring-shaped channel that partially or fully encloses the clutch or the brake.
    Type: Application
    Filed: May 14, 2003
    Publication date: January 8, 2004
    Inventors: Peter Schiele, Gert Bauknecht, Peter Ziemer, Ulrich Dorr, Ewald Ast