Patent ID: 8479895

Claim:
A vibration damper with stroke-dependent damping force comprising: a cylinder in which a piston rod with a piston is guided so as to be axially movable, the piston dividing the cylinder into two work spaces filled with a damping medium; a bypass arranged between the two work spaces that is opened or closed depending on a position of the piston in the cylinder; and a damping valve in the piston for at least one through-flow direction, the damping valve formed by at least one valve body that at least partially covers a through-flow channel in the piston, the at least one valve body has a first pressure-actuated surface and a second pressure-actuated surface, the two pressure-actuated surfaces are constructed on opposite cover sides of the at least one valve body, the first pressure-actuated surface exerts a lifting force and the second pressure-actuated surface exerts a closing force on a valve disk, wherein an action of the second pressure-actuated surface depends on a position of the piston in relation to the bypass, and wherein the first pressure-actuated surface is larger than the second pressure-actuated surface that is connected to a control space, which is likewise filled with the damping medium, and to a connection channel that overlaps with the bypass depending on a stroke position of the piston, wherein the connection channel extends radially up to a lateral surface of the piston and opens into an axial open groove.