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Click on “Download PDF” for the PDF version or on the title for the HTML version. If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options. Power Steering for Agricultural TractorsPublished by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org 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. (Download PDF) (Export to EndNotes)
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