Patent ID: 7632205

Claim:
An infinitely variable gear transmission system comprising: a differential gear unit coupled to a power input from a prime mover of a vehicle; two hydraulic pumps; a single stage epicyclic gear unit drivably intercoupling a sun gear with a first output shaft of said differential gear unit, and a planet carrier with a second output shaft, said epicyclic gear unit including the sun gear, a ring gear, the planet carrier, and at least one planet gear mounted on said planet carrier to rotate with and relative to said planet carrier and meshed with the sun gear and ring gear; wherein, a hydraulic circuit having direction control valves and orifices, hydraulically intercoupling one of the hydraulic pumps coupled to the first output shaft of said differential gear unit, and the second hydraulic pump coupled to the second output shaft, and a control unit selectively controlling the direction of a fluid flow and a resistance exerted by the fluid pressure on the sun gear and the planet carrier to control the speed of the ring gear of said epicyclic gear unit coupled to a drive shaft of the vehicle, in both clockwise and anticlockwise direction, to provide the desired speed, during forward, reverse and over drive.