Two identical conical disks 1 form an adjustable sheave that rotates about fixed axis A-A and whose side members (disks) 1 can be brought closer together or spread farther apart along axis A-A. Similar conical disks 2 rotate about and slide along fixed axis B-B. Flexible link 3, in the form of a wide V-belt, flexible but rigid to some extent laterally, runs over the sheaves with movable side disks 1 and 2. The transmission ratio between the sheaves is variable and depends on the positions of the side disks, causing the belt to climb to a larger radius on one sheave and to move to a smaller radius on the other. In each position i₁₂=ω₁/ω₂=n₁/n₂=R₂/R₁ where ω₁, ω₂, n₁ and n₂ are the angular velocities and speeds (in rpm) of sheaves 1 and" 2, and R₁ and R₂ are the variable radii of the circles of contact of the V-belt with the sheaves. Thus, the mechanism provides an infinitely variable transmission ratio.
$3515$SFL,BD$