Hydrostatic-mechanical vehicle drive

Claim 1

IN A TRANSMISSION HAVING AN INPUT AND A PAIR OF OUTPUTS, A PAIR OF FLUID PUMPS, FIRST DRIVE MEANS CONNECTING SAID INPUT TO EACH SAID PUMPS, A PAIR OF FLUID MOTORS, MEANS HYDRAULICALLY CONNECTING A FIRST OF SAID PUMPS TO A FIRST OF SAID MOTORS AND HYDRAULICALLY CONNECTING A SECOND OF SAID PUMP TO A SECOND OF SAID MOTORS, EACH OF SAID MOTORS HAVING A ROTATABLE OUTPUT, FIRST AND SECOND PLANETARY GEARSETS ASSOCIATED WITH SAID FIRST AND A SECOND OUTPUTS RESPECTIVELY, EACH OF SAID GEARSETS INCLUDING A SUN GEAR MEMBER AND RING GEAR MEMBER CONNECTED BY PINIONS AND INCLUDING A CARRIER MEMBER FOR SAID PINIONS, ONE OF SAID MEMBERS OF EACH GEARSET PROVIDING A FIRST INPUT MEMBER AND ANOTHER OF SAID MEMBERS PROVIDING A SECOND INPUT MEMBER AND THIRD OF SAID MEMBERS PROVIDING AN OUTPUT MEMBER, DRIVE MEANS CONNECTING THE OUTPUT MEMBER OF EACH GEARSET AND AN ASSOCIATED TRANSMISSION OUTPUT, TORQUE TRANSMITTING MEANS OPERATIVELY CONNECTED TO SAID FIRST DRIVE MEANS, A SELECTIVELY ENGAGEABLE CLUTCH HAVING FIRST FRICTION MEANS OPERATIVELY CONNECTED TO SAID TORQUE TRANSMITTING MEANS AND HAVING SECOND FRICTION MEANS OPERATIVELY CONNECTED TO SAID SECOND INPUT OF EACH OF SAID GEARSETS, A SELECTIVELY ENGAGEABLE FRICTION DRIVE ESTABLISHING DEVICE OPERATIVELY CONNECTED TO BOTH OF SAID SECOND INPUT MEMBER OF SAID GEARSETS WHEN ENGAGED TO HOLD SAID SECOND INPUT MEMBERS FROM ROTATION WHEN ONLY SAID FIRST INPUTS OF SAID GEARSETS AND DRIVEN AND TO THEREBY CONDITION SAID TRANSMISSION FOR AN ALL HYDROSTATIC LOW DRIVE RANGE, DISPLACEMENT CONTROL MEANS OPERATIVELY CONNECTED TO EACH SAID PUMP AND MOVABLE FROM ZERO DISPLACEMENT TO A HIGH DISPLACEMENT TO VARY THE DISPLACEMENT OF EACH SAID PUMP TO VARY THE SPEED OF SAID MOTOR AND THE HYDROSTATIC LOW DRIVE RANGE BETWEEN LOW AND HIGH SPEED RATIO, REVERSING VALVE MEANS HYDRAULICALLY CONNECTED TO EACH SAID PUMP AND MOTOR MOVABLE THE REVERSE THE DIRECTION OF OUTPUT OF EACH OF SAID MOTORS AS SAID FRICTION MEANS OF SAID CLUTCH ARE ENGAGED AND SAID FRICTION DRIVE ESTABLISHING DEVICE IS RELEASED TO CONDITION SAID TRANSMISSION FOR SPLIT HYDRAULIC AND MECHANICAL TORQUE HIGHER RANGE DRIVE AND AT AN INITIAL LOW SPEED RATIO SUBSTANTIALLY THE SAME AS THE HIGH SPEED RATIO IN SAID HYDROSTATIC LOW RANGE DRIVE, AND EACH SAID DISPLACEMENT CONTROL MEANS BEING SUBSTANTIALLY MOVABLE TOWARDS ZERO DISPLACEMENT TO REDUCE THE SPEED OF SAID OUTPUTS OF SAID MOTORS UNTIL A ZERO DISPLACEMENT SAID MOTORS HYDRAULICALLY ARREST THE ROTATION OF SAID FIRST INPUT MEMBER OF EACH GEARSET TO CONDITION SAID TRANSMISSION FOR AN ALL-MECHANICAL DRIVE WITH AN INPUT TO OUTPUT RATIO DIFFERENT FROM THE HIGH RATIO IN THE HYDROSTATIC DRIVE RANGE.