Worm 1 rotates about fixed axis C and meshes with worm wheel 2 which is rigidly attached to the carrier, designed as housing 3. Bevel planet gears 4, of the same size, rotate freely on studs of housing 3 and mesh with bevel sun gears 5 and 6 which are keyed to axle shafts B and A. These axle shafts are connected to driving links (not shown) of the mechanism. When the driving links rotate in the same direction at the same speed, sun gears 5 and 6 rotate at the same speed as housing 3. If the driving links have different speeds, then, when sun gears 5 and 6 rotate, planet gears 4 rotate about their axes. The speeds n₁, n₄ and n₆ of worm 1, and gears 4 and 6 (in rpm) are related by the equation n₁=(z₂/z₁)((n₄+n₆)/2) where z₁ is the number of threads (starts) of worm 1 and z₂ is the number of teeth of worm wheel 2.
$2913$CxG,DR$