| 摘要 |
A multi-regime continuously variable ratio transmission system has coaxial system input and output shafts ( 16, 24 ), a continously variable ratio transmission unit (V) connected coaxially to the system input shaft (16) and having a coaxial variator output shaft ( 18 ) and a mixing epicyclic gear train (E 1 ) having an input sun gear (S 1 ) drivably connected to the variator ouput shaft ( 18 ), a planet carrier (C 1 ) drivably connected to the system input shaft ( 16 ) and a planet gear (P 1 ) mounted on the planet carrier ((C 1 ). The planet gear (P 1 ) drives a first intermediate output shaft ( 22 ) arranged coaxially with the system input shaft ( 16 ) and selectively connectable to the system output shaft via a first clutch (H) in high-regime operation of the transmission. The planet gear (P 1 ) also provides the input for a second epicyclic gear train (E 2 ) having an output (C 2 ) which is selectively connectable to the system output shaft via a braking element (L) for low-regime operation of the transmission. The arrangement minimises the number of gear meshes, thereby minimising transmission losses and the absence of an annulus in the mixing epicyclic gear train (E 1 ) allows more freedom in the choice of gear sizes, thereby permitting reduced gear speeds.
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