Abstract: An anti-roll system for wheeled vehicles has one selective, unidirectionally lockable device per each independent suspension assembly having telescoping members connected between the sprung and unsprung masses that are free to extend or contract during vehicle operation which results in minimal lateral acceleration of the vehicle's sprung mass as when traveling down a straight roadway. The telescoping members include a piston that partially defines first and second chambers interconnected through valves to one another and to a common reservoir. The valves are activated, by a control system signal, when the sprung mass is subjected to a lateral acceleration which exceeds a preset threshold as when rounding a curve, blocking flow from one or the other of the first or second chambers so as to lock the outboard device, with respect to the curve, only against contraction and to lock the inboard device only against extension.

Abstract: A high pressure sealing system is disposed between a housing and a reciprocating member. One version has a reciprocating plunger and in another version is a reciprocating piston associated with a free floating piston.

Abstract: A hydropneumatic suspension unit includes a large diameter flanged road arm spindle which is bolted to the vehicle hull; a road arm has one end rotatably mounted on the road arm spindle and another end mounting a road wheel; a gravity oriented oil barrier is defined with a free volume enclosed within the road arm to submerge a sealing system for an in-arm mechanically operated pneumatic spring which has a gas volume trapped behind the oil barrier to support the sprung mass of the vehicle; the seal system is defined by a pair of spaced O-rings and a packing ring which seals the outer surface of a reciprocating rod that displaces the seal oil barrier to vary gas compression and produce a resultant force equivalent to pressure times the area of the rod to counteract vertical forces on the road wheel.