| 摘要 |
A continually variable transmission includes a fluid coupling having an impeller driven from a power source and connected to the input sheave of a fixed speed ratio change drive mechanism, and an impeller connected to the input sheave of a variable speed ratio belt drive mechanism. A coupling bypass clutch mechanically connects the impeller and the turbine. A compound planetary gear set has its sun gear driven from the output sheave of the variable drive mechanism and its ring gear connected to the output sheave of the fixed ratio mechanism, which is mounted on a one-way clutch and selectively drives the ring gear through a low mode clutch. One planet pinion set is continuously engaged with the ring gear, a second planet pinion set is continuously engaged with the first planet pinion set and with the ring gear. A pinion carrier rotatably supports both pinion sets and its connectable through a high mode clutch to the output of the variable belt mechanism. A final drive gear set connects the carrier to a differential mechanism through speed reduction gearing. One of the components of the high mode clutch may be mounted on a one-way clutch. A hill retard clutch selectively connects the carrier to the output of the variable drive mechanism. |
