| 摘要 |
A transmission comprises a first epicyclic train (23) having a first carrier member (23), which carries at least one first planet member (24) which is in driving engagement with a first annulus member (26) and with a first sun wheel (19) member and a second epicyclic train (34) comprising a second carrier member (33), which carries at least one second planet member (31) which is in driving engagement with a second annulus member (30) and with a second sun wheel (18) member wherein the first carrier member (23) is connected to the second annulus member (30) and the first (19) and second sun wheel (18) members being connected together, the first annulus (26) is connected to ground through a first electric motor (13) and the second sun wheel (18) is connected to ground through a second electric motor (15), one of said members of the first train (23) provides an input to said transmission and one of said members of the second train (34) provides an output of said transmission and there being control means to permit the speed of said motors (13, 15) to be varied to vary the output speed of the transmission.
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