| 摘要 |
<p>An electric actuator having an electric motor (1) operable to determine the output force generated on an output member (9) by a spring (10); a drive shaft (2) arranged to be driven by the electric motor (1) and having first (3) and second (4) drive means, a non-rotational but axially movable intermediate member (7) which is threadedly engaged with first driven means (24) arranged to be driven by the first drive means (3); the spring (10) being located between the intermediate member (7) and the output member (9) and arranged so that axial movement of the intermediate member (7) is transmitted to the output member (9) so long as the latter is free to move and, when the output member (9) is restrained from movement, generates the output force on the output member (9) upon continued operation of the electric motor (1); a stop (17) carried by the intermediate member (7) and positionally adjustable with respect thereto in the direction in which the intermediate member (7) is axially movable, and second driven means (12) engageable with the second drive means (4), the first driven means (12) being engageable with the stop (17) to arrest its rotation and, hence, through the second drive means (12), to arrest further operation of the electric motor (1) in its direction to increase the output force generated on the output member.</p> |
