G EAR C LEAR T ECHNOLOGY CVT DESIGN GOALS Truly continuously variable Highly efficient Transmit torque both forward and backward Able to transmit high torque levels, scaleable Able to shift under load Purely mechanical, no hydraulic pumps or electrical motors Computer control not required Clutches must be synchronized during all clutching

G EAR C LEAR T ECHNOLOGY Exponential relationship caused by roller gear/cam gear pair

G EAR C LEAR T ECHNOLOGY Exponential relationship caused by roller gear/cam gear pair

G EAR C LEAR T ECHNOLOGY Central gear ratio changes a fixed amount per degree rotation – exponential Angle between outer gears sets the ratio Each individual gear mesh is exponential and product is linear – overall linear ratio

G EAR C LEAR T ECHNOLOGY EXPONENTIAL RELATIONSHIP The ratio variability comes from exponential roller gear and cam gear pairs that function as noncircular gears Roller/cam pairs are located on three centers of rotation two fixed centers one translating to provide the varying ratio. two power paths are used, left and right side

G EAR C LEAR T ECHNOLOGY CLUTCH CONTROL Band clutch that is synchronized to the output by the exponential gears and tightened by an internal cam The cam is made up of telescoping segments driven in a nonlinear fashion by the location of the translating axle

G EAR C LEAR T ECHNOLOGY Power Flow Diagram