| 摘要 |
A linear actuator comprises rotary motion producing means ( 1,2,3,4,5 ); linear motion producing means ( 6,7,10,11,12 ) coupled with the rotary motion producing means for converting rotary motion to linear motion; a driven member ( 18 ) movable linearly by the linear motion providing means from a first position to a second position; and backdrive means ( 22 ) for returning the driven member to the first position. The arrangement is such that the linear motion producing means includes torque reaction means ( 13,15,16,17 ) which, in normal operation, is in an activated condition and provides a torque reaction path to enable the driven member to be moved from the first to the second position but which, in the event of a fault, is in a de-activated condition so that it no longer provides the torque reaction path and the back-drive means can move the driven member to the first position, without disengaging the rotary motion producing means from the linear motion producing means.
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