Hydrostatic power transmission system

Claim 1

IN A HYDROSTATIC POWER TRANSMISSION SYSTEM ADAPTED TO DELIVER DRIVING TORQUE FROM AN INTERNAL COMBUSTION ENGINE TO A DRIVEN MEMBER, A PAIR OF HYDROSTATIC FLUID DISPLACEMENT UNITS DISPOSED IN A COMMON HYDROSTATIC FLUID CIRCUIT AND DEFINING A POWER FLOW PATH BETWEEN SAID ENGINE AND SAID DRIVEN MEMBER, FLUID PRESSURE SENSITIVE MEANS FOR VARYING THE RELATIVE DISPLACEMENT OF SAID UNITS, A DRIVEN SPEED PRESSURE SIGNAL SOURCE, A SOURCE OF A PRESSURE SIGNAL THAT IS RELATED TO ENGINE TORQUE, A HYDRAULIC PASSAGE MEANS EXTENDING FROM A HIGH PRESSURE REGION OF SAID SYTEM TO SAID PRESSURE SENSITIVE MEANS, RATIO CONTROL VALVE MEANS DISPOSED IN AND PARTLY DEFINING SAID PASSAGE MEANS FOR CONTROLLING DISTRIBUTION OF PRESSURE TO OPPOSED PORTIONS OF SAID PRESSURE SENSITIVE MEANDS TO EFFECT CHANGES IN SAID RELATIVE DISPLACEMENT, SAID RATIO CONTROL VALVE MEANS COMMUNICATING WITH EACH SIGNAL SOURCE AND RESPONDING TO CHANGES IN THE MAGNITUDE OF SAID SIGNALS, AND LIMIT VALVE MEANS COMMUNICATING WITH SAID ENGINE TORQUE PRESSURE SIGNAL SOURCE AND RESPONDING TO SAID ENGINE TORQUE PRESSURE SIGNAL FOR OVERRULING THE PRESSURE DISTRIBUTING ACTION OF SAID RATIO CONTROL VALVE MEANS THEREBY SUPPRESSING ENGINE SPEED DURING THE INITIAL STAGES OF THE PERIOD OF ACCELERATION OF SAID DRIVEN MEMBER.