| 摘要 |
<p>A shock absorber comprising a tubular working cylinder (12) destined to be mounted on a suspended part of a vehicle, a piston rod assembly (26) slideably received in the working cylinder (12) and having an end (28) destined to be mounted on a fixed part of a vehicle, the piston rod assembly (26) having at its free end a piston member (40) cooperating with the working cylinder (12) to divide the interior thereof into an upper (52) and a lower working chamber (50), valve means in the piston member (40) to permit controlled two-way flow between the upper and lower working chambers (52,50) characterized in that it further comprises a mass (58) mounted in the shock absorber and displaceable in response to a predetermined acceleration of the shock absorber from a first position in which the mass closes a passage (56,54,90) between the upper working chamber (52) and a reservoir (50 ; 22), a second position in which the passage (56,54,90) is open.</p> |
