| 摘要 |
The invention relates to a vibration damper, especially for damping retraction or extension springing forces on motor vehicles, which includes a pressure medium cylinder (2), in which a piston (3) with a piston rod (3) is axially slidably arranged. The piston divides the pressure medium cylinder (2) into a retraction chamber (5) and an extension chamber (6), in which an electrorheological or magnetorheological fluid is contained as a pressure medium. The retraction (5) and extension chambers (6) are connected with one another at least by a throttle gap (7), in the region of which at least one field force generating element (17) is arranged. At least one further non-return check valve (14) is arranged in a further gap (13) between the pressure medium chambers (5, 6). The invention is characterized in that the length of the throttle gap (7) is divided by a gap intersection or gating point (10) into a first throttle gap section (11) and a second throttle gap section (12). In that regard, the second throttle gap section (12) is connected with the extension chamber (6) and the first throttle gap section (11) is connected with the retraction chamber (5). Still another bypass gap (13) is provided parallel to the first gap section (11), and a non-return check valve (14) that is open toward the retraction chamber (5) is arranged in the bypass gap (13).
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