Patent ID: 6648310
Filing Date: 2003-11-18
Classification: F16F

Abstract:
A shock absorber, comprising: a cylinder defining a working space filled with damping medium; a piston rod arranged in the cylinder as a displacer and having a piston which subdivides the working space filled with damping medium into first and second working chambers, said piston rod having a cross-sectional area ADS; an outer tube arranged concentrically with the cylinder so as to form together with the cylinder an annular space outside said cylinder, said annular space having a cross-sectional area ADR, wherein the cross-sectional area ADR is substantially equal to the cross-sectional area ADS; and seals arranged so as to seal off the annular space from the atmosphere, wherein the outer tube together with the piston rod execute a synchronous movement relative to the cylinder as a function of reciprocating movement of the shock absorber, at least one of the seals of the annular space being arranged in a fixed location with respect to the cylinder, and at least another one of the seals being arranged in a fixed location with respect to the outer tube, so that the annular space has a volume which varies as a function of reciprocating position of the shock absorber, the cylinder having at least one flow connection so as to connect the annular space to at least one of the working chambers, said outer tube and said piston rod forming an annular chamber which is isolated from said annular space, said annular chamber being connected to atmosphere.