| 摘要 |
The invention relates to a transmission unit (1) for drive units used to achieve at least two operational states: a first operational state for the transmission of power with at least two gear steps, and a second operational state for braking. The transmission unit comprises an input shaft (E) and an output shaft (A); a first, hydraulic transmission part (2); and a second mechanical transmission part (3), with the two parts being arranged in series. The hydraulic part (2) comprises at least two blade wheels (a primary blade wheel (4) and a secondary blade wheel (5)), which together form at least one toroid operating space (6) which can be filled with operating fluid. The two blade wheels (4, 5) are coupled to the input shaft (E) of the transmission unit and to the mechanical part (3) via at least pan of the first operational state in such a way that power is transmitted from the primary blade wheel (4) to the mechanical part (3) via the secondary blade wheel (5). The invention is characterized i n that elements (PK, PB) are included which, in a second operational state, hold and support the first (4) of the two blade wheels (4 , 5) in relation to the fixed transmission parts (9) and connect the other, secondary blade wheel (5) with the second mechanical transmission par t (3).
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