Four-speed hydromechanical compound transmission

Claim 1

A FOUR-SPEED HYDROMECHANICAL COMPOUND TRANSMISSION FOR VEHICLES, INCLUDING: TWO JUXTAPOSED COAXIALLY PLACED CONTROLLABLE HYDRODYNAMIC TORQUE CONVERTERS, EACH OF SAID CONVERTERS HAVING AN IMPELLER, MEANS FOR JOINTLY DRIVING SAID IMPELLERS, TWO CONCENTRIC SHAFTS, EACH OF SAID CONVERTERS HAVING A TURBINE WHEEL, THE TURBINE WHEEL OF ONE OF SAID CONVERTER BEING MOUNTED ON ONE OF SAID SHAFTS, THE TURBINE WHEEL OF THE SECOND CONVERTER BEING MOUNTED ON THE SECOND OF SAID SHAFTS, ONE OF SAID CONVERTERS BEING CAPABLE OF HIGH-TORQUE CONVERSION FOR STARTING, THE SECOND CONVERTER HAVING A HIGH EFFICIENCY OVER A BROAD RANGE AT HIGH SPEEDS, A COUNTERSHAFT, A FIRST SPUR GEAR PAIR HAVING A GEARWHEEL MOUNTED ON ONE OF SAID CONCENTRIC SHAFTS, SAID FIRST SPUR GEAR PAIR HAVING A SECOND GEARWHEEL MOUNTED ON SAID COUNTERSHAFT, A SECOND SPUR GEAR PAIR HAVING ONE GEARWHEEL MOUNTED ON THE SECOND CONCENTRIC SHAFT, SAID SECOND SPUR GEAR PAIR HAVING A SECOND GEARWHEEL MOUNTED ON SAID COUNTERSHAFT, ONE GEAR WHEEL OF EACH OF SAID SPUR GEAR PAIRS BEING ROTATABLE ON THE RESPECTIVE SHAFT AND THE OTHER GEARWHEEL OF EACH OF SAID SPUR GEAR PAIRS BEING MADE FAST ON THE RESPECTIVE SHAFT, A CLUTCH OPERATIVELY INTERPOSED BETWEEN EACH OF SAID GEARWHEELS WHICH ARE ROTATABLE ON THE RESPECTIVE SHAFTS, AND THE RESPECTIVE SHAFT FOR SELECTIVELY CLUTCHING SAID GEARWHEELS TO THE RESPECTIVELY SHAFTS, AND CLUTCH MEANS OPERATIVELY INTERPOSED BETWEEN SAID CONCENTRIC SHAFTS FOR CLUTCHING AND DECLUTCHING SAID CONCENTRIC SHAFTS.