Patent ID: 7278522

Claim:
Controllable motion damper ( 4 ) with a damping piston ( 10 ′), said damping piston ( 10 ′) separating two damping chambers ( 12 , 13 ) from each other in a damping cylinder ( 10 ), and with a damping valve ( 15 ) disposed in a connecting channel ( 28 , 29 ) of the two damping chambers ( 12 , 13 ), the transmissivity of said damping valve ( 15 ) for a damping fluid contained in the motion damper ( 4 ) being controlled by a control device ( 21 , 16 ), characterized in that both damping chambers ( 12 , 13 ) are filled with an electromagnetically uninfluenceable damping fluid, the control device having a slide piston unit ( 21 ) filled with a magnetorheological fluid, said slide piston unit ( 21 ) having a slide piston ( 22 ) operatively coupled to the damping piston ( 10 ′), wherein, through the intermediary of the magnetorheological fluid, said magnetorheological fluid being influenceable by controllable magnetic field generators ( 30 ) with regard to its flow resistance, said slide piston ( 22 ) acts on an actuator ( 16 ) connected to the damping valve ( 15 ) for controlling the movement of the damping piston ( 10 ′).