| 摘要 |
1. Step-up transmission to rotate a power transmission shaft comprising a housing (1) containing an output shaft (9) integral with a large ring gear (12) ; an input shaft (13), equipped with a drive pinion (28) and a plurality of drive shafts (A, B), each of which is equipped with an intermediate pinion (23a, 23b), in constant mesh with said ring gear (12) and associated with a drive pinion (27, 31), rotated by said drive pinion (28) ; each driven pinion (27, 31) is associated with a clutch (29, 32) ; transmission wherein said clutches (29, 32) of said shafts (A, B) are of a type which is engaged when deactivated ; this enables said transmission in inert condition to lock and immobilize angular movement of said output shaft (9) with respect to said input shaft (13) via said drive shafts (A, B).
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