Patent ID: 6619445
Filing Date: 2003-09-16
Classification: F16F

Abstract:
A telescopic vibration damper comprisinga pressure tube enclosing a working chamber filled with a damping medium and having a base, a piston rod arranged to move axially in said pressure tube, said piston rod carrying a piston which moves in said working chamber, an intermediate tube in which said pressure tube is arranged to move axially, an annular chamber between said pressure tube and said intermediate tube, said annular chamber being filled with said damping medium, a flow connection between the working chamber and the annular chamber, said flow connection comprising a bottom valve in said base, said bottom valve opening when said piston rod moves toward said base, a separating piston fixed to said base of said pressure tube and engaging said intermediate tube, said separating piston displacing a volume as said pressure tube moves axially in said intermediate tube, and a compensating chamber accommodating the volume displaced by said separating piston as said pressure tube moves axially in said intermediate tube, the working chamber and the annular chamber being hydraulically separated from the compensating chamber by the separating piston.