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US 2004/0200946 A1Published application
Vibration damper with amplitude-selective damping force
AssigneeZF Sachs AG
InventorsRobert Pradel, Helmut Baalmann
Life of this patent
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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.
Claims6
A vibration damper comprising:
- a cylinder filled with damping medium;
- a piston rod guided in the cylinder in an axially movable manner, the piston rod carrying a piston which divides the cylinder into a work space on the piston rod side and a work space remote from the piston rod;
- a housing which is axially movable in one of the work spaces, the housing containing an axially movable separating piston which separates the housing into a first work chamber and a second work chamber;
- a bypass connecting at least one of the work spaces to the first work chamber;
- and
- a switchable valve controlling the bypass.
3 more elements
Dependencies are inferred from the claim text.