Link 1 turns about fixed axis A and carries roller 2 which rotates about axis C-C. Roller 2 is in contact at point D with toroidal wheel e whose generatrix is a circular arc described from point A. Wheel e is keyed to shaft 3 and rotates about fixed axis B-B. The transmission ratio from roller 2 to shaft 3 is i₂₃=ω₂/ω₃=n₂/n₃=(b-R*sin(φ))/r₂ where ω₂, ω₃, n₂ and n₃ are the angular velocities and speeds (in rpm) of roller 2 and shaft 3, b is the distance from axis A to axis B-B, R is the radius of arc d-d on wheel e, r2 is the radius of roller 2 and φ is the variable angle between the plane of roller 2 and a plane passing through axis A and parallel to axis B-B.
$3470$CF,IV$