Hydraulic vibration damper piston with an integral...

Brakes – Internal-resistance motion retarder – Motion damped from condition detected outside of retarder

Reexamination Certificate

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C188S282600

Reexamination Certificate

active

07654369

ABSTRACT:
A vibration damper piston includes a piston body with a bore from which first and second apertures respectively provide paths to first and second chambers of the vibration damper. A valve spool in the bore defines a pilot chamber and controls fluid flow between the first and second apertures. First and second springs bias the valve spool in opposing directions. A control orifice provides a continuous fluid path between the first chamber and the pilot chamber, and a variable orifice provides another fluid path between the second chamber and the pilot chamber. An actuator is operably connected to adjust the variable orifice in response to a control signal.

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patent: 6575484 (2003-06-01), Rogala
patent: 6834736 (2004-12-01), Griesbach et al.
patent: 6860369 (2005-03-01), Weiffen et al.
patent: 6860370 (2005-03-01), Nakadate
patent: 7234386 (2007-06-01), Schedgick et al.

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