Vehicle suspension damper with remote control

Claim 1

A vehicle suspension damper comprising: a pressure cylinder and a piston assembly comprising a piston and piston rod; working fluid within said pressure cylinder; a passageway through said piston for allowing said working fluid to pass from one side of said piston to the other side of said piston; a linearly actuatable valve within said piston for controlling the flow of fluid through said passageway, said valve comprising a double-headed poppet which is force-balanced with respect to the flow of fluid acting upon the valve by the flow of fluid impinging upon the valve urging each poppet of the double-headed poppet in opposite axial directions with equal force; a fluid motor within said piston for controlling said valve, with said motor comprising a pressure responsive rolling diaphragm and a cup-shaped cylindrical piston driven by said rolling diaphragm; and an axial passage through said piston rod for communicating pressure signals from a fluid controller to said fluid motor whereby the damper is able to respond very quickly to signals from the fluid controller because only inertial forces and friction need be overcome to move the valve.