Vibration damper with amplitude-selective damping force

US7156214B2 · kind B2 · utility

Assignee

• ZF Sacha AG · DE

Inventors

• Robert Pradel · Schweinfurt, DE
• Helmut Baalmann · Bergrheinfeld, DE

Key dates

• Filing date: Apr 8, 2004
• Grant date: Jan 2, 2007
• Expiry date: Dec 10, 2024

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/466
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

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.