Sistemi Sospensioni S.p.a.

Gianfranco De Lillo

Walter Bruno

Massimo Trinchera

A piston () comprises a first pair of passive flow-control valves () [namely, a first compensation valve () and a first rebound valve ()], a second pair of passive flow-control valves () [namely, a second compensation valve () and a second rebound valve ()], and a flow-dividing solenoid valve () shiftable between a first operating position [in which it allows flow of a damping fluid between an upper chamber and a lower chamber of a shock absorber through the first pair of passive flow-control valves () and second pair of passive flow-control valves ()] and a second operating position [in which it allows the flow of the damping fluid between the upper chamber and lower chamber through only the second pair of passive flow-control valves ()]. The solenoid valve () is normally open (i.e., it is normally kept in the first operating position).

Piston for a damping-adjustable shock-absorber, particularly for a vehicle suspension, provided with four passive flow-control valves and with a flow-dividing solenoid valve

A flow-control passive valve controls flow of fluid between an upstream space at high pressure and downstream space at low pressure. The valve comprises a valve body in fluid communication with the upstream and downstream spaces and within which are defined first and second spaces. A movable member is slidably received in a body chamber, and a force is applied to the member tending to keep it in a given 'non-working' position. Metering discs meter the flow from the upstream to downstream space through the body and comprise first, second, and third fixed restrictors and first and second variable restrictors. Pressure in the first space is lower than that in the upstream space via a pressure drop through the first fixed restrictor while pressure in the second space is variable between the pressure in the first space and that in the downstream space depending on the position of the member.

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Asti, Italy

Gianfranco De Lillo