| 摘要 |
A transmission device including a planetary gear train (7) with a ring gear (8) connected to the input (2a), and a sun wheel (9) counter-rotationally locked by a free-wheel (16). A planet pinion carrier (13) is connected to the output shaft (2ab). The ring gear(8) and the planet pinion carrier (13) may be coupled via a clutch (18a) which is compression-actuated by fly-weights (29) to ensure direct drive. When the clutch is released by an axial thrust (Pac) caused by the helical gearing and countering that of the fly-weights, the sun-wheel (9) is immobilized by the free-wheel (16) and the device operates as a reducing mechanism. The planetary gear train is arranged as an oil pump delivering through a duct (58) and through the stack of clutch discs (19, 22). When the clutch is actuated by the fly-weights, the delivery path is closed off, and the meshing motion between the gears forming the oil pump tends to be eliminated as a result. Therefore, the frictional process of the discs need only immobilize the gears to achieve direct drive. Ratio changes may be made more flexible, and clutch wear and heating may be reduced. |
