| 摘要 |
<p>Damper for a motor vehicle suspension, of the type comprising a cylinder (2) containing a hydraulic fluid, a piston (1) activated by a rod (3) defining, in the cylinder, a first chamber (2a) and a second chamber (2b), the said second chamber containing the rod, a reservoir of hydraulic fluid (11) capable of communicating with the first chamber (2a) via a restriction (23) during a fast compression movement. A control valve (3) is capable of opening a fluid passage between the first chamber (2a) and the second chamber (2b), the said control valve (30) being subjected, on the one hand, to the pressure of the hydraulic fluid situated in the first chamber (2a) and tending to open the valve, and, on the other hand, to the action, tending to close the valve, of a return spring (35) and of the substantially constant pressure of a fluid contained in a reference chamber (28), one wall of which can move with the control valve. An external compensating envelope (46) is integrally connected to the rod (3) and encloses the damper leaktightly, the compensating envelope being connected by a duct (52, 44, 51) to an external source of variable pressure.
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