Patent ID: 7111711
Filing Date: 2006-09-26
Classification: F16F

Abstract:
1. A vibration damper comprising: a cylinder containing a damping medium; a piston rod extending from said cylinder; a piston connected to said piston rod, said piston having a piston rod side and a side away from said piston rod, said piston separating said cylinder into a working space on said piston rod side and a working space on said side away from said piston rod; a bypass connecting said working spaces when said piston is in a limited range of positions; at least one first through-channel for flow in a first direction between said working spaces through said piston, each said first through-channel having an outlet side; a first valve disk covering said outlet side and having a first pressure-actuated surface upon which pressure can act to lift said first valve disk from a closed position to an open position to permit flow in said first direction, and a second pressure actuated surface which is separated from said first pressure-actuated surface when said first valve disk is in said closed position and can be acted on by damping medium flowing in said first direction via said bypass so that the pressure on said first and second pressure actuated surfaces of said first valve disk is additive; and a sealing sleeve received in said cylinder and extending from said first valve disk into the working space on said piston rod side.