| 摘要 |
The epicyclic train is able to operate as a speed reducing gear when sun-wheel ( 5 ) is stuck by a one-way clutch ( 8 ), and in direct drive when clutch ( 10 ) is engaged. The whole coupling and control structure for the ratio change is essentially grouped on the sun-wheel element ( 5 ) which is slidingly movable and integral with an inverter control means ( 111 ) which engages brake ( 9 ) when disengaging clutch ( 10 ), and conversely. The brake ( 9 ) is mounted mechanically in parallel with a one way clutch ( 8 ), and allows speed reducing operation when the torque applied to the input shaft ( 31 ) is a retarding torque. The one-way clutch is mounted in parallel with an axially unslidable bearing ( 54 ) between a stator shaft ( 21 ) and a support ( 51 ) coupled for common rotation with and mutual slidability with respect to the sun-wheel element ( 5 ). For actuation of the control member ( 111 ) there is provide an hydraulic actuator ( 116 ), spring ( 114 ), and involvement of the helical teeth axial thrust (F 1 , F 2 ). Useful for simplifying the control, keeping a possibility of other selective couplings, allowing other operating conditions, with the other rotary elements ( 6, 7 ) of the train, and avoiding the thrust bearings.
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