| 摘要 |
<p>An actuator includes a screw mechanism (13) having a threaded nut (16) rotatable by an electric motor (11) about a longitudinal axis (x) and a screw (17) translatable along the axis between an axially extended position and an axially retracted position. The screw (17) is connectable to a wire (W) of a Bowden cable (C) having an outer sheath (S). The actuator has a casing (20) with a first, fixed transversal surface (18). A cup (50) is mounted axially slidably on the casing (20) and has a second transversal surface (51) adapted for resting against an end of the sheath (S). A spring (53) is compressed between the first, fixed transversal surface (18) and the sliding cup (50). The cup (50) is capable of reaching an axially extended position, corresponding to a released brake condition, and an axially retracted position towards the first fixed transversal surface (18), against the bias of the spring (53), corresponding to a brake actuated condition.</p> |
