Vibration damper with adjustable damping force

US8307965B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Andreas Föster · Schweinfurt, DE
• Alfred Wirth · Schweinfurt, DE
• Heinz-Joachim Gilsdorf · Gerolzhofen, DE
• Thomas Kutsche · Schweinfurt, DE

Key dates

• Filing date: Oct 12, 2006
• Grant date: Nov 13, 2012
• Expiry date: Jun 17, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/516
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The vibration damper with an adjustable damping force includes a cylinder filled with a damping medium, a piston rod axially movable in the cylinder and carrying a piston which divides the cylinder into a first working space on the piston rod side and a second working space on the side away from the piston rod, a first adjustable damping valve which is connected to at least one of the two working spaces by means of a fluid connection, at least one second valve which is connected hydraulically in parallel to the first adjustable damping valve, and a third damping valve arranged in series to and upstream from both the first and second valves, the third damping valve moving in a closing direction as a function of a flow velocity of the damping medium through the third damping valve.