| 摘要 |
<p>The invention discloses a linear actuator comprising a DC motor controlled from a control unit. The driving shaft of this actuator is linked by connecting means to a worm screw shaft (23) directly meshing with a toothed wheel (32) in the axis of which is mounted a linking shaft (36), a portion of which forms a screw and co-operates with a nut (38) secured to an anchoring device (44) to which is connected the unit to be controlled in such a way that the rotating movement of the driving shaft directly generates a linear translation movement of the anchoring device, force limiting means being further provided to avoid the screw being blocked at the end of travel of the linking shaft. These force limiting means comprise a set of spring washers (52) mounted on the free end of the linking shaft (36) between a first element (53) secured to this shaft and a second element acting as a stop (45, 46), such that the accumulated kinetic energy at the end of travel is immediately restored in the opposite direction avoiding the risk of blocking the screw.</p> |
