Patent ID: 8920276

Claim:
A controller for varying gear ratios in a transmission system coupled to an engine and including at least one planetary gear train disposed within a housing, the controller comprising: a ratio control gear set including: a sun gear; a planet carrier including one or more planet gears meshed with the sun gear, the planet carrier configured to rotatably connect to an output shaft of the engine; and a ring gear meshed with the planet gears and configured to mesh with a sun gear of the planetary gear train; and a ratio control pump including: a body configured to rigidly connect to the housing; and a rotor rigidly coupled to the sun gear of the ratio control gear set and configured to co-act with the body to pump fluid; and a relief valve connected to the ratio control pump and configured to restrict fluid egress from the ratio control pump, wherein the rotor is configured to slip with respect to the body while the relief valve selectively restricts fluid egress from the pump.