Patent ID: 6251039
Filing Date: 2001-06-26
Classification: F16H

Abstract:
A continuous variable transmission comprising a toroidal transmission mechanism, a first planetary gearset and a second planetary gearset, the toroidal transmission mechanism being comprised of at least one pair of toroidal transmission units, each of which comprises an input disk revolving integrally with an input shaft, an output disk arranged confronting the input disk and supported for rotation on the input shaft, and power rollers arranged between the confronting input and output disks and supported for pivoting motion on a stationary case, the first planetary gearset being comprised of a hollow drive shaft connected integrally with the output disk and fitting over the input shaft for relative rotation, a first sun gear connected integrally with the hollow drive shaft, a first pinion, a first carrier connected integrally with the input shaft and supporting thereon the first pinion for rotation, and a first ring gear, the second planetary gearset being comprised of a second sun gear transmitted with a torque from the first pinion, a second pinion, a second carrier supporting thereon the second pinion for rotation, and a second ring gear, the first pinion in the first planetary gearset being of a dual pinion that is made with a first planet-gear meshing with the first sun gear and a second planet-gear meshing with both the first planet-gear and the first ring gear, the second pinion in the second planetary gearset being of a dual pinion that is made with a third planet-gear meshing with the second sun gear and a fourth planet-gear meshing with both the third planet-gear and the second ring gear, the first ring gear coming in engagement with the second carrier through a first clutch and the second ring gear coming in engagement with the stationary case through a second clutch, whereby the torque of the second carrier is transmitted to an output shaft that is connected integrally with the second carrier.