Patent ID: 6932734

Claim:
A planetary gear apparatus comprising: a pair of internal ring gears interconnected to be driven together; a pair of planetary gear assemblies each meshingly engaged respectively with one of said pair of internal ring gears, each comprising a plurality of sets of planet gears; each of said sets of planet gears having an outer planet gear meshingly engaged respectively with one of said pair of internal ring gears and an inner planet gear meshingly engaged with another inner planet gear; and, a pair of sun gears each meshingly engaged respectively with one of said planetary gear assemblies, each of said pair of sun gears meshingly engaged respectively with one of said pair of inner planet gears the sun gears being interconnected with each other such that when a driving force is applied to the internal ring gears and an equal force is applied to the sun gears, the inner and outer planet gear of each pair of planetary gears do not rotate about their own axes, but the entire planetary gear assemblies rotate synchronously with their respective sun gears to deliver full and unbiased traction to both outputs, and when the equal force applied to one of said pair of sun gears causes it to rotate faster than its associated respective ring gear, an interconnection between the sun gears causes the other sun gear to change its speed oppositely, and the sets of planet gears associated with the faster rotating sun gear rotate reversely with respect to the internal ring gear, and the sets of planet gears associated with the slower rotating sun gear rotate forward with respect to the internal ring gear to accommodate the speed differential between the sun gears while both internal ring gears are driven at the same speed.