Vehicle steering systems
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United States of America Patent
Stats
-
Nov 7, 1989
Grant Date -
N/A
app pub date -
Sep 11, 1987
filing date -
Sep 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A steering system for a tow tractor having steerable front and rear road wheels is disclosed. The steering system comprises a steering wheel for turning the front road wheels and a hydrauclic servo valve for turning the rear road wheels through an angle proportional to the turning of the front road wheels. A rear mechanical push-pull cable is used for signaling a feedback angular quantity of the turning of the rear road wheels to the servo valve. A front mechanical push-pull cable is used for signaling an input angular quantity of the turning of the front road wheels to the servo valve. A hydraulic clutch is used for remotely engaging and disengaging the front mechanical system having at least two steering modes for the front and rear road wheels. A method of operating a vehicle having mechanical controls for steerable front and rear road wheels is disclosed that eliminates the dangers of a failure mode inherent in an electronic control over hydraulic four-wheel steering device.
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