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Power Steering for Agricultural Tractors

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Power Steering for Agricultural Tractors. ASAE Distinguished Lecture No. 1, pp. 1-22. Winter Meeting of the American Society of Agricultural Engineers, 17 December 1975, Chicago, Illinois  903C0575.(doi:)
Authors:   R.A. Wittren
Keywords:   Reasons for Power Steering, Design Considerations, Hydromechanical Power Steering, Hydrostatic Power Steering, Selection of System Type, Determination of Power Requirements, Determination of Kingpin Torque, Surface and Soil Conditions, Tire Characteristics, Steering Geometry, Steering Torque Characteristics, Steering Ratio, Steering Effort, Sizing of Components, Actuators, Control Valves, Lines, Hoses, and Internal Passages, Orifices, Power Steering Pumps, Engineering Specifications, Safety, Costs, Reliability, Durability, and Warranty, Sound Levels, Test Procedures

This paper examines the market demand for tractors capable of higher than normal working speeds and discusses the evolution of such tractors in the market place over the past 20 years. The key engineering issues which have to be addressed in the construction of tractors of up to 80 kph (50 mph) speed capability are discussed in detail. Particular attention is paid to the areas of vehicle ride and handling, wheel and tire technology, steering, suspension and braking systems.

To illustrate that all necessary engineering requirements can be met in a vehicle that also develops comparable off road traction to that of a similar horsepower conventional tractor, the JCB Fastrac is discussed as a case study. Particular reference is made to the way in which the key vehicle systems above have been engineered into the vehicle.

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