Torque limiting fluid drive

Claim 1

IN AN OVERLOAD PROTECTED FLUID COUPLING, VANED IMPELLER AND RUNNER SHELLS MOUNTED IN OPPOSED ROTATABLE RELATION, SAID IMPELLER AND RUNNER SHELLS BEING RESPECTIVELY MOUNTED ON ALIGNED INPUT AND OUTPUT SHAFTS AND BEING AXIALLY SPACED TO DEFINE A RADIALLYEXTENDING FIRST SPACE THEREBETWEEN FOR EXHAUSTING FLUID FROM SAID COUPLING, MEANS FOR SUPPLYING HYDRAULIC FLUID TO SAID COUPLING, A CASING CONNECTED TO SAID IMPELLER SHELL AND EXTENDING IN SURROUNDING RELATION TO SAID RUNNER SHELL TO DEFIINE AN ANNULAR SPACE AROUND SAID OUTPUT SHAFT IN FLUID FLOW COMMUNICATION WITH SAID FIRST SPACE FOR EXHAUSTING FLUID FROM SAID COUPLING AND A VALVE ON SAID FLUID COUPLING AND POSITIONED IN SAID ANNULAR SPACE TO CONTROL FLUID FLOW THERETHROUGH, SAID VALVE INCLUDING MEANS OPERATIVELY CONNECTED TO ONE OF THE RUNNER SHELL AND OUTPUT SHAFT ACTUATING THE VALVE TOWARD A CLOSED POSITION UPON AN INCREASE IN OUTPUT SPEED AND ACTUATING THE VALVE TOWARD AN OPEN POSITION UPON A DECREASE IN OUTPUT SPEED.