Driving bevel pinion 1 is keyed to shaft a and rotates about fixed axis A. Pinion 1 meshes with bevel gear 2 which is rigidly attached to (or integral with) carrier 5. Carrier 5 is connected by turning pairs B to bevel planet gears 3 which mesh with bevel sun gears 4 and 6, keyed to shafts b and d. Shafts b and d rotate about fixed axis C-C. The speeds n₁, n₄ and n₆ of shafts a, b and d (in rpm) are related by the equation n₄=2(z₁/z₂)n₁-n₆ where z₁ and z₂ are the numbers of teeth of gears 1 and 2.
$2910$CxG,DR$