| 摘要 |
<p>A continuously variable transmission comprises coaxial system input and output shafts (16, 20), a continuously variable ratio transmission unit (variator) (V) connected coaxially to the system input shaft (16) and having a coaxial variator output shaft (18) and a mixing planetary gear train (G1). The mixing planetary gear train has an input sun gear (S 1) drivably connected to the variator output shaft (18), a planet carrier (C 1) drivably connected to the system input shaft (16), a first planet gear (P 1) mounted on the planet carrier (C 1) and drivingly engaged with the input sun gear (S 1), a second planet gear (P2) mounted on the planet carrier (C 1) and arranged to rotate with the first planet gear (P 1) and drivingly engaged with an output sun gear (S2) connected to an output shaft (20). The ratio R1 (the number of teeth on the input sun gear ÷ by the number of teeth on the first planet gear) is set to be greater than R2 (the number of teeth on the output sun gear ÷ by the number of teeth on the second planet gear). This ensures that the variator always transmits less than 100% of the engine power, which allows the variator to be made more compact.</p> |
