초록 ▼

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 overdri

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.

대표청구항 ▼

[ We claim:] [1.] A continuously variable transmission for a motor vehicle having a power source, comprising:an input shaft;an output shaft;a traction drive variator including a first disc, a second disc, and rollers driveably engaging the first disc and second disc at variable radial positions, for

[ We claim:] [1.] A continuously variable transmission for a motor vehicle having a power source, comprising:an input shaft;an output shaft;a traction drive variator including a first disc, a second disc, and rollers driveably engaging the first disc and second disc at variable radial positions, for varying the rotational speed at the second disc in relation to the speed at the first disc;a first gearset driveably connected to the input shaft and variator for overdriving the first disc in relation to the speed of the input shaft;a clutch for alternately driveably connecting and releasing the input shaft and first gearset;a planetary gear unit driveably connected to the second disc and output shaft for producing greater torque and slower rotational speed at the output shaft than the torque and speed at the second disc;a reverse drive brake for alternately holding against rotation and releasing a first component of the planetary gear unit, thereby producing reverse drive; anda forward drive brake for alternately holding against rotation and releasing a second component of the planetary gear unit, thereby producing forward drive.