Single cavity toroidal traction drive continually variable transmission

摘要

An automatic transmission for an automotive vehicle includes a traction drive variator having an input disc, an output disc, and rollers driveably engaged with the discs and adapted to vary continuously the ratio of the speeds of the output disc and input disc. The input disc is reversed and overdriven by a gearset whose ring gear is connected to an input shaft; carrier is held permanently; and sun gear drives the input disc. A planetary gear unit driven by the output disc produces a speed reduction in response to alternate engagement of a forward drive brake and reverse drive brake.