| 摘要 |
<p>The jack has a reduction gear (1) driven by a motor (M), and a screw (12) engaging with a fixed nut (13), rotated by the reduction gear. A rotary output gear (3) is driven by at least one satellite gear (6) through a toothed endless belt (8). The screw is fixed to the output gear and the lengthwise extension (L) of the gear corresponding to the screw's travel. The reduction gear has a fixed input gear (2) and a satellite carrier (4) driven by the motor and equipped, in addition to the first satellite driving the output gear, by at least one other satellite (5) meshing with the input gear. The engagement between the second satellite gear and the fixed input gear is also formed by a toothed belt (7). The carrier (4) has two diametrically-opposite arms (4A,4B) containing shafts (10) for the two sets of satellite gears.</p> |
