| 摘要 |
A transmission unit (8) for a rotor (4) of an aircraft (1) capable of hovering, comprising: a sun gear (14) rotating about a first axis (A) and connectable to a drive input member (10); a fixed crown wheel (13); and at least three planet gears (15), which can rotate about respective second axes (B) and can each mesh with the sun gear (14) and the crown wheel (13); the second axes (B) being, in turn, rotatable about the first axis (A); and a spider (16) operatively connected to the planet gears (15), rotating about the first axis (A) and connectable to the drive shaft (5); the transmission unit (8) comprises at least three bearings (21), each interposed between a respective planet gear (15) and the spider (16); at least one bearing (21) comprises a number of rolling bodies (27) shaped like barrel rollers and made of a ceramic material. |
