Abstract: A high ratio traction drive transmission includes a sun roller, a traction ring, a plurality of traction planets in contact with the sun roller and the traction ring, at least one reaction roller in contact with at least one of the traction planets, and a carrier assembly coupled to at least one of the traction planets and the at least one reaction roller. The sun roller has a first longitudinal axis and the traction ring is aligned coaxially with a second longitudinal axis, wherein the first longitudinal axis is radially offset from the second longitudinal axis.

Abstract: A high ratio traction drive transmission includes a sun roller, a traction ring, a plurality of traction planets in contact with the sun roller and the traction ring, at least one reaction roller in contact with at least one of the traction planets, and a carrier assembly coupled to at least one of the traction planets and the at least one reaction roller. The sun roller has a first longitudinal axis and the traction ring is aligned coaxially with a second longitudinal axis, wherein the first longitudinal axis is radially offset from the second longitudinal axis.

Abstract: Provided herein is a continuously variable transmission (CVT) having a plurality of balls, each ball having a tiltable axis of rotation, each ball in contact with a first traction ring and a second traction ring, the CVT including: a main shaft aligned along a longitudinal axis of the CVT, the main shaft positioned radially inward of the balls, the first traction ring and the second traction ring; a cam driver operably coupled to the first traction ring; an axial thrust bearing operably coupled to the cam driver and the main shaft; an inner race member coupled to the axial thrust bearing and the cam driver; an outer race member coupled to the axial thrust bearing and the main shaft; and a passive preload ring coupled to the inner race member and the cam driver.

Abstract: A control system to control the operating conditions of a Continuous Variable Transmission configured to receive signals and execute commands based at least in part on a driver's torque or load request. The control system includes a ratio controller incorporating binary logarithmic processes applied to a commanded CVP ratio and an actual CVP ratio. The binary logarithmic processes provide linearized signals to a PID controller to thereby provide a commanded CVP ratio to form a commanded CVP shift actuator position.