Four-wheel coordinated steering multi-purpose tractor

Details Four-wheel coordinated steering multi-purpose tractor Four-wheel coordinated steering multi-purpose tractor

1990-06-08

1992-02-25

Hill, Mitchell J.

Motor vehicles

Having four wheels driven

With means for steering all driven wheels

180234, 180140, 280 91, 280 99, 56DIG22, B60K 17358

Patent

active

050905120

ABSTRACT:
A four-wheel mobile vehicle including provision for controlling the steering position of each of the four (4) wheels so that every wheel's rolling axis will intersect at a common point around which the vehicle will turn. The control is provided by a pair of cables, one on each side of the vehicle which interconnect a pair of front and back wheels to turn each pair through similar angles in the opposite direction.
The variance in angular turning between wheels on opposite sides of the vehicle is caused by wrapping the cables on each side around an identical cam pulley, one on each side, both of which are mounted on a common shaft so that their angular rotation is always identical while their winding radius is changing. The pair of cables are separately driven at different rates by a pair of double-acting hydraulic cylinders connected in parallel to a conventional power steering unit whereby the winding in and paying-out of the cable on the cam pulleys at different radiuses causes the wheels on opposite sides to turn at different rates.

REFERENCES:
patent: 2763331 (1956-09-01), Le Tourneau
patent: 2910131 (1959-10-01), Krotz
patent: 3504928 (1970-04-01), Reimer
patent: 3596730 (1971-08-01), Cecce
patent: 4043419 (1977-08-01), Larson et al.
patent: 4289214 (1981-09-01), Spence
patent: 4364577 (1982-12-01), Tateyama et al.
patent: 4373603 (1983-02-01), Nelson
patent: 4852679 (1989-08-01), Fry
patent: 4914894 (1990-04-01), Gieger
patent: 4957183 (1990-09-01), Mullet et al.

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