Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1987-09-11
1989-11-07
Hill, Mitchell J.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
280 91, B62D 714
Patent
active
048785563
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.
REFERENCES:
patent: 3007537 (1961-11-01), Exley et al.
patent: 3392987 (1968-07-01), Muller et al.
patent: 3414286 (1968-12-01), Muller et al.
patent: 3446307 (1969-05-01), Logus
patent: 3903983 (1975-09-01), Yeske
12-page publication "Steering System Adjustment Procedure for T&TD-225 SL and T&TD-300 SL Paymovers"; International Harvester Co. of Chicago, IL.
1-page disclosure of Parker Hydraulic and Pneumatic Cylinder.
1-page (front and back) document "Model S-4R Rotary Mechanical Servo Valve by Olsen Controls, Inc. of Bristol, CT".
1 page of Atlas Fluid Control Corporation hydraulic directional control valve.
1 page entitled "Closed-center Hydraulic System", dated Aug. 1982.
Hill Mitchell J.
Stewart & Stevenson Services, Inc.
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