Abstract: A continuously variable transmission, which comprises a drive race for receiving power input, a driven race for transmitting power output and a set of rollers between the races. Each roller in the set is capable of rotating to transfer motion from the drive race to the driven race, is capable of tilting about a first tilt axis to vary a ratio of the continuously variable transmission, and is capable of tilting about a second tilt axis different from the first tilt axis. The transmission further comprises a ratio change actuator acting on each roller of the set for tilting the roller about its second tilt axis, a tilt of the roller about its second tilt axis inducing a reaction force on the roller tending to tilt the roller about its first tilt axis and thus provoke a ratio change.

Abstract: A continuously variable transmission, which comprises a drive race for receiving power input, a driven race for transmitting power output and a set of rollers between the races. Each roller in the set is capable of rotating to transfer motion from the drive race to the driven race, is capable of tilting about a first tilt axis to vary a ratio of the continuously variable transmission, and is capable of tilting about a second tilt axis different from the first tilt axis. The transmission further comprises a ratio change actuator acting on each roller of the set for tilting the roller about its second tilt axis, a tilt of the roller about its second tilt axis inducing a reaction force on the roller tending to tilt the roller about its first tilt axis and thus provoke a ratio change.

Abstract: A toric-drive transmission comprising a drive disk for receiving a power input. A driven disk transmits a power output. A roller device has a roller displaceably mounted between the drive disk and the driven disk. The roller has three rotational degrees of freedom. A first degree of freedom transmits motion from the drive disk to the driven disk to convert the power input to the power output. A second degree of freedom varies a ratio of the power output to the power input as a function of an orientation of the roller along the second degree of freedom. A third degree of freedom initiates a rotation of the roller about the second degree of freedom. A controller system is operatively connected to the roller device for changing the orientation of the roller in the second degree of freedom by actuating a displacement of the roller in the third degree of freedom.

Abstract: A toric-drive transmission comprising a drive disk for receiving a power input. A driven disk transmits a power output. A roller device has a roller displaceably mounted between the drive disk and the driven disk. The roller has three rotational degrees of freedom. A first degree of freedom transmits motion from the drive disk to the driven disk to convert the power input to the power output. A second degree of freedom varies a ratio of the power output to the power input as a function of an orientation of the roller along the second degree of freedom. A third degree of freedom initiates a rotation of the roller about the second degree of freedom. A controller system is operatively connected to the roller device for changing the orientation of the roller in the second degree of freedom by actuating a displacement of the roller in the third degree of freedom.