Power transmission

Claim 1

A POWER TRANSMISSION COMPRISING IN SERIES POWER FLOW RELATION, FIRST AND SECOND, MASTER CLUTCHES OF THE FRICTION PLATE TYPE AND ARRANGED FOR SELECTIVE CONNECTION TO AN ELECTRIC INDUCTION MOTOR AND AN HYDRAULID TORQUE CONVERTER HAVING A TOROIDAL CIRCUIT, EACH MASTER CLUTCH INCLUDING A CHAMBER FOR RECEIVING PRESSURE OIL TO ENGAGE THE ASSOCIATED CLUTCH, THE FIRST MASTER CLUTCH BEING DIRECTLY CONNECTED TO THE MOTOR, A GEAR TRAIN CONNECTING THE SECOND MASTER CLUTCH TO THE MOTOR AND ARRANGED TO PROVIDE FOR A HIGHER ROTATIVE SPEED OF THE SECOND CLUTCH WHEN ENGAGED RELATIVE TO THAT OF THE FIRST CLUTCH WHEN ENGAGED, AND AN HYDRAULIC SYSTEM INCLUDING AN OIL SUPPLYING PUMP, THE TOROIDAL CIRCUIT, A REGULATING VALVE HAVING PRESSURE CONNECTIONS WITH THE FIRST AND SECOND CLUTCH CHAMBERS AND RELIEF OUTLET CONNECTIONS WITH THE PLATES OF THE FIRST AND SECOND CLUTCHES, BOTH OF SAID LAST NAMED CONNECTIONS INCLUDING A SELECTOR VALVE SHIFTABLE BETWEEN ONE POSITION DETERMINING AN ENGAGEMENT OF THE FIRST CLUTCH, A SUPPLY OF COOLING OIL TO THE PLATES THEREOF AND RELEASE OF THE SECOND CLUTCH AND ANOTHER POSITION DETERMINING AN ENGAGEMENT OF THE SECOND CLUTCH, A SUPPLY OF COOLING OIL TO THE PLATES THEREOF AND RELEASE OF THE FIRST CLUTCH, AND MEANS FOR INFINITELY CONTROLLING THE REGULATING VALVE TO VARY THE PRESSURE IN THE CHABER OF THE CLUTCH BEING ENGAGED.