The invention relates to a vibration damper for damping spring retraction and/or spring extension forces on motor vehicles, which includes an inner pressure medium cylinder (1), in which a piston (2) with a piston rod (3) is axially slidably arranged, which divides the inner pressure medium cylinder (1) into a retraction chamber (4) and an extension chamber (5), in which an electrorheological fluid as a pressure medium is contained, wherein the retraction chamber (4) and the extension chamber (5) is connected through at least one throttle gap (6) between the inner cylinder tube (1) and an electrode tube (7) arranged coaxially thereto, and that the electrode tube (7) is surrounded coaxially by a spaced-apart further outer tube (8), which together with the electrode tube (7) forms a gas pressure chamber (9), which is connected through a bottom valve (10) with the retraction chamber (4). The invention is characterized in that at least two axially linear or helically shaped seal means (11) are arranged between the inner cylinder tube (1) and the electrode tube (7), wherein the seal means divide the throttle gap (6) into at least two similar valve partial gaps (12, 13), and that a first throttled non-return valve (14) which opens toward the gas pressure chamber (9) is arranged between the extension chamber (5) and the gas pressure chamber (9).
Vibration Damper
03.03.2016
Patent
Elektronische Ressource
Englisch