Transmission

Claim 2

IN A TRANSMISSION ASSEMBLY, A FIRST GEAR UNIT PROVIDING A PLURALITY OF RATIO DRIVES, A SECOND GEAR UNIT PROVIDING A PLURALITY OF RATIO DRIVES, CONNECTED IN SERIES WITH SAID FIRST UNIT, CONTROL MEANS TO SELECTIVELY ENGAGE A RATIO DRIVE IN SAID FIRST UNIT AND A RATIO DRIVE IN SAID SECOND UNIT TO PROVIDE A PLURALITY OF COMBINATION RATIO DRIVES NORMALLY TRANSMITTING THE FULL POWER APPLIED TO SAID FIRST UNIT, MEANS RESPONSIVE TO A PREDETERMINED VALUE OF TORQUE BEING TRANSMITTED BY SAID UNITS OPERATIVELY CONNECTED TO SAID CONTROL MEANS TO PARTIALLY DISENGAGE THE DRIVE RATIO ENGAGED IN SAID FIRST UNIT TO CONTINUE TO TRANSMIT TORQUE AND TO LIMIT THE TORQUE TRANSMITTED TO A PREDETERMINED MAXIMUM SAFE VALUE TO PREVENT DAMAGE TO THE TRANSMISSION ASSEMBLY.

Claim 3

IN A TRANSMISSION ASSEMBLY, MULTIRATIO TRANSMISSION DRIVE TRAIN MEANS HAVING MULTIRATIO GEARING AND A PLURALITY OF GROUPS OF FLUID ACTUATED RATIO FRICTION ENGAGING DEVICES EACH HAVING A PLURALITY OF SAID DEVICES OPERATIVE FOR PROVIDING EACH OF A PLURALITY OF DRIVE TRAIN RATIOS ON THE ENGAGEMENT OF AT LEAST TWO OF SAID RATIO ENGAGING DEVICES ONE IN EACH GROUP, A SOURCE OF FLUID UNDER PRESSURE, MEANS TO CONTROL THE PRESSURE OF THE FLUID FROM SAID SOURCE TO PROVIDE A LOW AND A HIGH FLUID PRESSURE, VALVE MEANS TO CONTROL THE SUPPLY OF FLUID FROM SAID SOURCE IN EACH RATIO POSITION TO ENGAGE TWO OF SAID FLUID ACTUATED RATIO ENGAGING DEVICES TO PROVIDE EACH DRIVE RATIO, CONTROL MEANS EFFECTIVE ONLY DURING THE ENGAGING MOVEMENT OF ONE OF SAID RATIO ENGAGING DEVICES TO INSURE DISENGAGEMENT OF ANOTHER OF SAID RATIO ENGAGING DEVICES OPERATIVE IN EACH DRIVE TRAIN RATIO, SAID CONTROL MEANS BEING EFFECTIVE WHEN SAID ONE RATIO ENGAGING DEVICE IS ENGAGED TO ENGAGE SAID OTHER RATIO ENGAGING DEVICE, AND MEANS TO MODIFY THE ACTION OF SAID CONTROL MEANS TO EFFECT DISENGAGEMENT AND ENGAGEMENT OF SAID OTHER RATIO ENGAGING DEVICE WHEN THE ENGAGING PRESSURE AT SAID ONE RATIO ENGAGING DEVICE IS CHANGED BETWEEN SAID LOW PRESSURE AND SAID HIGH PRESSURE OF SAID SOURCE.

Claim 4

IN A TRANSMISSION ASSEMBLY, MULTIRATIO TRANSMISSION DRIVE TRAIN MEANS HAVING MULTIRATIO GEARING AND A PLURALITY OF GROUPS OF FLUID ACTUATED RATIO FRICTION ENGAGING DEVICES EACH HAVING A PLURALITY OF SAID DEVICES OPERATIVE FOR PROVIDING EACH OF A PLURALITY OF DRIVE TRAIN RATIOS ON THE ENGAGEMENT OF AT LEAST TWO OF SAID RATIO ENGAGING DEVICES ONE IN EACH GROUP, A SOURCE OF FLUID UNDER PRESSURE, MEANS TO CONTROL THE PRESSURE OF THE FLUID FROM SAID SOURCE TO PROVIDE A LOW AND A HIGH FLUID PRESSURE, VALVE MEANS TO CONTROL THE SUPPLY OF FLUID FROM SAID SOURCE IN EACH RATIO POSITION TO ENGAGE TWO OF SAID FLUID ACTUATED RATIO ENGAGING DEVICES TO PROVIDE EACH DRIVE RATIO, CONTROL MEANS EFFECTIVE ONLY DURING THE ENGAGING MOVEMENT OF ONE OF SAID RATIO ENGAGING DEVICES TO INSURE DISENGAGEMENT OF ANOTHER OF SAID RATIO ENGAGING DEVICES OPERATIVE IN EACH DRIVE TRAIN RATIO, SAID CONTROL MEANS BEING EFFECTIVE WHEN SAID ONE RATIO ENGAGING DEVICE IS ENGAGED TO ENGAGE SAID OTHER RATIO ENGAGING DEVICE, AND MEANS TO MODIFY THE ACTION OF SAID CONTROL MEANS TO EFFECT DISENGAGEMENT AND ENGAGEMENT OF SAID OTHER RATIO ENGAGING DEVICE WHEN THE ENGAGING PRESSURE AT SAID ONE RATIO ENGAGING DEVICE IS CHANGED BETWEEN SAID LOW PRESSURE AND SAID HIGH PRESSURE OF SAID SOURCE.