the shaft 54 of drive motor 53 and is splined to the hub of gear 21 and to the end of an internal coaxial shaft 27 the shaft 27 is provided in common mesh with coupling 25 and extends through coaxial bores in other elements of the mechanism rearward where it meshes by splines with planet carrier 28 a set of differential gears combines the torque of the shafts 2 amp 27 one example of the gear set comprises output planet gears 43 which spin on bearings mounted on axially disposed spindles secured to carrier 28 planet gears 43 are in common mesh with sun gear 45 which is in turn keyed onto shaft 2 ring gear 44 is also in common mesh with planet gears 43 and the hub of gear 44 rotates on a bearing mounted on the neck of carrier 28 the hub of gear 44 is supported in bearing set 46 and is integral to output shaft 47 shaft 47 will of course be coupled to drive a load in this embodiment the diametrical ratio between ring gear 44 and sun gear 45 is 4 5 1 although other ratios are of course possible parallel or u201c split torque u201d transmission of torque is accomplished by the transmission of one torque reaction through gear 21 gears 10 cones 7 disk 1 shaft 2 and sun gear 45 to the differential planet gears 43 and then another torque reaction through shaft 27 through carrier 28 to planet gears 43 which is the other parallel torque path the differential action of planet gears 43 combines the two separate torques and directs a single torque to ring gear 44 in this manner the main.