Tapered gear 1 rotates about fixed axis A and has teeth whose generating lines are parallel to the elements of the pitch cone of gear 1. Tapered pin wheel 2 rotates about fixed axis B and has pins a located along a helix of the pitch cone of wheel 2. When driving pin wheel 2 rotates, pins a mesh with the teeth of gear 1. The mechanism transmits rotation from wheel 2 to gear 1, on parallel axes A and B, with a variable transmission ratio equal to i₂₁=ω₂/ω₁=(d-l sin(ϕ))/(l sin(ϕ)) 0) where ω₁ and ω₂ are the angular velocities of gear 1 and wheel 2, d is the distance between axes A and B, ϕ is one half of the included angle of the pitch cones, and l is the distance from apex 0 of cone 2 to the centre of pins a.
$2588$PG,3L$