| 摘要 |
There is described a helicopter (1) having a transmission (5) for transmitting motion from a driving member to a driven member; the transmission (5) has at least a first gear (8; 10) driven by the driving member, and a second gear (10; 12) meshing with the first gear (8) and in turn driving the driven member; the first and second gear (8, 10; 10, 12) have teeth (16, 17, 18) shaped so that the gears (8, 10) mesh with one another at at least two pairs of respective simultaneously meshing teeth (16, 17; 17, 18); the teeth (16, 17, 18) of at least one of the gears (8, 10, 12) have a profile (19) having an end portion (21) relieved with respect to a starting theoretical involute (E); and the pattern (G) of the distance between the points of the end portion (21) and the starting involute (E) along an axis (A, H) of the tooth (16, 17, 18) has at least a first and a second segment (B, C) sloping with respect to each other. |
