Worm 1 rotates about fixed axis A and its threads mesh with teeth a and b of gears 2 and 3 which rotate about fixed axes B and C. Teeth a and b are located on the end faces of gears 2 and 3, forming crown gears. Axes B and C are parallel to each other and are perpendicular to, but do not intersect, axis A. The transmission ratios of the mechanism are i₁₂=ω₁/ω₂=z₂/z₁ and i₁₃=ω₁/ω₃=z₃/z₁ where ω₁, ω₂ and ω₃ are the angular velocities of worm 1 and of gears 2 and 3, z₁ is the number of threads, or starts, on worm 1, and z₂ and z₃ are the numbers of teeth on gears 2 and 3. When driving worm 1 rotates, driven gears 2 and 3 rotate in opposite directions.
$2813$WG,4L$