Shaft 1 with friction roller a rotates about fixed axis A and is in contact with ball 2 which, in turn, is in contact with friction disk b. Shaft 3 with disk b rotates about fixed axis B. The transmission ratio from shaft 1 to shaft 3 i₁₃=ω₁/ω₃=n₁/n₃=d/r where ω₁, ω₃, n₁ and n₃ are the angular velocities and speeds (in rpm) of shafts 1 and 3, r is the radius of roller a and d is the variable distance from the centre of ball 2 to axis B. The ball can be moved along roller a and disk b by a special carrier (not shown).
$3464$CF,IV$