Abstract
Gearless transmission is motivated by the recent global trend of compactness and lower vibration. Continuously Variable Transmission (CVT) has been becoming the right solution to answer the problem. However, CVT models typically yield non-holonomic equations. And the non-holonomic equations, in turn, are cumbersome.
This paper presents a mechanism of gearless transmission for low torsion. The transmission consists of two curved cones and a planetary disk. The power transmission is conducted by contact surfaces between the cones and the disk. The gear ratio (i ) and the torque magnitude (M(t)) are influenced by the disk orientation (q). The diameters of planetary disk and cones are also affecting the driven cone.
Equations dealing with CVT Kinematics are derived and mechanical-hydraulic model is discussed. The mechanical-hydraulic models represent the hydraulic control system which commonly uses Proportional Integration and Differentiation (PID) compensation. Finally, the dynamic characteristics of CVT are presented in term of gear ratio and velocity.
This transmission design could be applied in automotive fields by concerning the maximum torque transmitted. The mechanism could be developed in design and manufacture to accommodate the need of power transmission.