| 摘要 |
A transmission for changing the rotational speed of an engine input shaft to a driven output shaft. The transmission includes a first and second face gears. Each face gear has first and second sets of teeth formed on it. Each set of teeth forms an annular pattern about a central axis. The second set of teeth on each face gear is located within and concentric with the first set of teeth. An input gear, adapted to be driven by the engine output shaft, is disposed between and engaged with the first sets of teeth on the first and second face gears such that rotation of the input gear produces rotation of the first and second face gears in opposite directions about the central axis. An output pinion is rotatably mounted to a pinion shaft. The output pinion is disposed between and engaged with the second sets of teeth on the first and second face gears such that rotation of the face gears produces corresponding rotation of the output pinion about the pinion shaft. The pinion shaft is adapted to rotate a driven output shaft, such as a main rotor shaft on a helicopter, about an axis coincident with the central axis. The transmission of the present invention is designed such that rotation of the first and second face gears about the central axis produces corresponding rotation of the pinion shaft and driven output shaft about the central axis.
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