| 摘要 |
The actuator comprises a tubular nut ( 22 ) coupled by means of an external thread ( 21 ) to the casing ( 12 ) of the actuator. The nut has an internal thread ( 23 ) opposite the external thread, for engaging a threaded rod ( 11 ) which is prevented from rotating with respect to the casing. A geared motor ( 13, 14 ) rotates a pinion ( 15 ) which, through two straight spur gears ( 161, 162 ), causes the nut ( 22 ) to bring about a screwing movement along a longitudinal axis (x), while the rod ( 11 ) translates rapidly in telescopic manner with respect to the casing ( 12 ). The spur gears have a pinion portion of greater diameter ( 161 a, 162 a) meshing with the pinion ( 15 ), and a splined shaft portion ( 161 b, 162 b) meshing with a pinion member ( 22 b) integral with the nut ( 22 ).
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