A High Ratio Multi-Moded Vehicle Transmission Utilizing a Traction Toroidal Continuously Variable Drive and Traction Planetary

A novel transmission has been designed, built, and tested utilizing a traction continuously variable drive and a planetary traction fixed ratio drive. This paper describes the design of the transmission both in terms of power flow concept and in new component construction. The continuously variable drive and planetary are combined in a scheme whereby three modes of power flow are meshed to provide a high continuously variable ratio range of more than 20:1 overall. Neutral and reverse are available with no additional hardware. The transmission was installed in a half ton pick-up truck for testing the concept as a high ratio vehicle transmission.