| 摘要 |
<p>Described herein is a planetary gear train (6) for an aircraft (1) capable of fixed-point flight, comprising: a sun gear (7) that can turn about a first axis (A) and comprises a plurality of first teeth (11); a fixed crown wheel (8) comprising a plurality of second teeth (12); and at least two planetary gears (9a, 9b, 9c, 9d, 9e), each comprising a plurality of third teeth (13), the planetary gears (9a, 9b, 9c, 9d, 9e) each meshing with the crown wheel (8) and the sun gear (7) and being able to turn about respective second axes (B), which are in turn able to turn about the first axis (A); at least two third teeth (13) simultaneously mesh with respective second teeth (12) and a further two third teeth (13) simultaneously mesh with respective first teeth (11); the third teeth (13) comprise a first side (16a) and a second side (16b), which have, respectively, a first pressure angle (±1) and a second pressure angle (±2) different from one another; and the number (ZP) of the third teeth (13) of each planetary gear (9a, 9b, 9c, 9d, 9e) is different from the absolute value of the semidifference ((ZC-ZS)/2) between the number (ZS) of the first teeth (11) of the sun gear (7) and the number (ZS) of the second teeth (12) of the crown wheel (8).</p> |
