| 摘要 |
<p>A stacked compound planetary gear (10) train for an upgraded powertrain system for a helicopter that provides an increased reduction ratio to accommodate the increased horsepower output of the augmented powerplant system (102A, 102B) while concomitantly providing a baseline RPM output to the main rotor shaft (106). The stacked compound planetary gear train (10) includes a driving sun gear (12), a set N of primary planetary pinions (14), a plurality of secondary planetary pinions (16), a compound drive shaft (18) supporting each respective primary (14) and secondary (16) planetary pinion combination, a fixed ring gear (20) interacting with the secondary planetary pinions (16), and a planetary carrier assembly (22) disposed in rotatable combination with the compound drive shafts (18) and operative to provide the output of the stacked compound planetary gear train (10) to the main rotor shaft (106) of the helicopter. The set N of primary planetary pinions (14) includes a plurality N/2 of upper primary planetary pinions (14U) and a plurality N/2 of lower primary planetary pinions (14L). The upper and lower primary planetary pinions (14U, 14L) are disposed in a staggered, biplanar relationship wherein each upper primary planetary pinion (14U) overlaps the immediately adjacent lower primary planetary pinions (14L).</p> |
