HOOD-LIFTING ACTUATOR WITH DISARMABLE RETURN BRAKING ARRANGEMENT

摘要

The invention relates to an activated-stroke actuator comprising a body (12) that houses a mobile assembly consisting of a piston (13), a rod (16) that penetrates the end of the body (12) and a sliding element (17) that moves inside body (12). The actuator further comprises a means for propelling the piston (13) in response to an activation command, and a return braking arrangement. The return braking arrangement consists of at least one bearing ball (18) fitted into an annular cavity (19) defined by the inner surface of the body (12) and by the sliding element (17), a return spring (22) connecting the sliding element (17) to the piston (13) and a connecting element (23) connecting the bearing ball (18) to the piston (13). The bearing ball (18) is positioned by the connecting element (23) in a first segment (20) in the annular cavity (19) when the return spring (22) is extended, and in a second segment (21), of decreasing radial height, when the return spring (22) is compressed. Thus, the braking arrangement is disarmed when the force applied to the piston (13) returns to a value that is lower than a threshold value.