LINEAR ACTUATOR FOR ADJUSTING A SPRING OF A SHOCK ABSORBER ASSEMBLY, SPRING, AND VEHICLE SUSPENSION DAMPER ASSEMBLY COMPRISING SUCH A ACTUATOR

摘要

The damper and spring unit comprises a damper (10) with a cylinder (14) and a rod (16), a spring (12) arranged around the damper (10) and a linear actuator (20) provided to vary in a manner controlled the axial position of a lower end of the spring (12) relative to the cylinder (14) of the damper (10). The actuator (20) comprises an inner cylindrical member (22) adapted to be assembled around the cylinder (14) of the damper (10), an outer cylindrical member (24), which is assembled axially sliding relative to the inner cylindrical element (22) and which is adapted to support the lower end of the spring (12), and a working chamber (26) adapted to be filled with fluid under pressure to adjust the axial position of the outer cylindrical element ( 24) relative to the inner cylindrical member (22). The working chamber (26) is delimited, either radially or axially, only by the inner cylindrical member (22) and the outer cylindrical member (24). The outer cylindrical member (24) is provided with a support flange (28) adapted to support the lower end of the spring (12). The support flange (28) is positioned below the upper end of the outer cylindrical member (24), so that the outer cylindrical member (24) is at least partly arranged within the the volume of the spring (12), and extends radially outwardly relative to the outer cylindrical member (24), so that the inner diameter (Di) of the spring (12) is greater than the outside diameter (De) of the outer cylindrical member (24).