Patents Assigned to ZF Sacha AG
  • Vibration damper with amplitude-selective damping force
    Patent number: 7156214
    Abstract: Vibration damper includes a cylinder filled with a damping medium in which a piston rod with a piston is guided in an axially movable manner, wherein the piston divides the cylinder into a work space on the piston rod side and a work space remote of the piston rod. A bypass connects at least one of the two work spaces with a first work chamber in a housing in which an axially movable separating piston separates the first work chamber from a second work chamber, the bypass being controlled by a switchable valve.
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: January 2, 2007
    Assignee: ZF Sacha AG
    Inventors: Robert Pradel, Helmut Baalmann