Patent ID: 7997392

Claim:
Vibration damper, which includes a pressure medium cylinder, in which a piston with a piston rod is arranged in an axially slidable manner, which piston divides the pressure medium cylinder into a retraction chamber and an extension chamber, in which an electrorheological or magnetorheological fluid is contained as a pressure medium, whereby the retraction chamber and the extension chamber are connected with one another at least by a throttle gap in the region of which at least one field force generating element is arranged, whereby at least one non-return check valve is arranged in a bypass gap, characterized in that a length of the throttle gap is divided by a gap intersection point into a first throttle gap section and a second throttle gap section, wherein the second throttle gap section is connected with the extension chamber and the first throttle gap section is connected with the retraction chamber, and wherein the bypass gap is connected parallel to the first gap section between the gap intersection point and the retraction chamber.