Patent ID: 9662952
Date: 2017-05-30
CPC Classifications: B60G,F16F

Claim:
1. A vibration damper for damping spring retraction and/or spring extension forces on motor vehicles, comprising: an inner pressure medium cylinder; a piston with a piston rod axially slidably arranged in the inner pressure medium cylinder, wherein the piston divides the inner pressure medium cylinder into a retraction chamber and an extension chamber; a pressure medium comprising an electrorheological fluid contained in the retraction and extension chambers; an electrode tube arranged coaxially around the inner pressure medium cylinder; at least one throttle gap between the inner pressure medium cylinder and the electrode tube, wherein the retraction chamber and the extension chamber are connected through the at least one throttle gap; an outer tube that coaxially surrounds and is spaced-apart from the electrode tube, wherein the outer tube together with the electrode tube form a gas pressure chamber, which is connected through a bottom valve with the retraction chamber; at least two axially linear or helically shaped seal means arranged between the inner pressure medium cylinder and the electrode tube, wherein the seal means divide the throttle gap into at least two similar valve partial gaps; and a first throttled non-return valve which opens toward the gas pressure chamber and is arranged between the extension chamber and the gas pressure chamber.