Vehicle with selective hydraulic drive means

Claim 1

A SELF-PROPELLED VEHICLE COMBINATION HAVING A POWER PLANT INCLUDING AT LEAST ONE FIRST GROUND-ENGAGING ELEMENT AND AT LEAST ONE SECOND GROUND-ENGAGING ELEMENT, AN INFINITELY VARIABLE SPEED RATIO REVERSIBLE HYDROMECHANICAL POWER TRANSMISSION UNIT HAVING A POWER INPUT SHAFT DRIVENLY CONNECTED TO SAID POWER PLANT AND A POWER OUTPUT SHAT DRIVINGLY CONNECTED TO SAID FIRST GROUND-ENGAGING ELEMENT, SAID TRANSMISION UNIT COMPRISING A HOUSING WITH A MULTICYLINDER HYDRAULIC PUMP DRIVENLY CONNECTED TO SAID POWER INPUT SHAFT, SAID PUMP HAVING A MECHANICAL FORCE REACTING MEANS POSITIONED FOR TRANSMITTING MECHANICALLY AT LEAST A PORTION OF THE POWER FROM SAID POWER INPUT SHAFT TO SAID POWER OUTPUT SHAFT, A MULTICYLINDER HYDRAULIC MOTOR DRIVINGLY CONNECTED TO SAID POWE OUTPUT SHAFT, SAID TRANSMISSION UNIT HAVING HYDRAULIC CONNECTING MEANS FOR COMMUNICATIVELY CONNECTING SAID PUMP WITH SAID MOTOR FOR HYDRAULICALLY TRANSMITTING POWER FROM SAID POWER INPUT SHAFT TO SAID POWER OUTPUT SHAFT IN PARALLEL RELATION WITH POWER TRANSMITTED BY SAID MECHANICAL FORCE REACTING MEANS, SAID HYDROMECHANICAL POWER TRANSMISSION UNIT HAVING A SOURCE OF FLUID PRESSURE POWER-TAKE-OFF IN SIAD HYDRAULIC CONNECTING MEANS, A SECOND GYDRAULIC MOTOR DRIVINGLY CONNECTED TO SAID SECOND GROUND-ENGAGING ELEMENT, SECOND HYDRAULIC CONNECTING MEANS COMMUNICATIVELY CONNECTING SAID SECOND HYDRAULIC MOTOR TO SAID SOURCE OF FLUID PRESSURE POWER-TAKE-OFF OF SAID HYDROMECHANICAL POWER TRANSMISSION UNIT, AND ADJUSTABLE MEANS IN SAID SECOND CONNECTING MEANS FOR ESTABLISHING REVERSE FLOW TO SAID SECOND MOTOR WHEREBY SAID POWER PLANT ENERGIZES SAID HYDROMECHANICALLY SAID FIRST GROUND ENGAGING ELE DRIVE HYDROMECHANICALLY SAID FIRST GROUND ENGAGING ELEMENT AND HYDROSTATICALLY DRIVE SAID SECOND GROUND-ENGAGING ELEMENT FOR PROPELLING SAID VEHICLE IN A FORWARD OR REVERSE DIRECTION DEPENDING UPON THE POSITION OF SAID ADJUSTABLE MEANS.