Hydraulic actuator for a vehicle roll control system

摘要

A hydraulic actuator (34) for a vehicle roll control system including a torsion bar; the hydraulic actuator being attachable to the torsion bar and comprising a housing (56); a piston (62) making a sealing sliding fit inside the housing to define a first fluid chamber (58) and a second fluid chamber (60); a piston rod (64) connected to the piston and extending through the second fluid chamber and out of the housing; and a check valve system (400) which allows fluid flow from the first fluid chamber to the second fluid chamber when the fluid pressure in the first fluid chamber exceeds the fluid pressure in the second fluid chamber; wherein the check valve system includes a fluid passage (404) between the first fluid chamber and the second fluid chamber, and a check valve (406,408) which closes the fluid passage when the fluid pressure in the second fluid chamber is substantially the same as or greater than the fluid pressure in the first fluid chamber. Reduces the risk of air entering the second fluid chamber.