Motor vehicles – Having four wheels driven
Patent
1992-07-07
1994-03-15
Hill, Mitchell J.
Motor vehicles
Having four wheels driven
180244, 180247, B60K 1734, B62D 1102
Patent
active
052939561
ABSTRACT:
A four wheel drive working vehicle having a front wheel transmission switchable between a standard position for driving front wheels at substantially the same speed as rear wheels, and an accelerating position for driving the front wheels at a higher speed than the rear wheels; right and left side brakes for acting on the right and left rear wheels, respectively; a control device for switching the front wheel transmission from the standard position to the accelerating position when the front wheels are steered in excess of a first predetermined angle rightward or leftward from a straight running position, and for operating one of the right and left side brakes inwardly with respect to turning of the vehicle when the front wheels are steered in excess of a second predetermined angle rightward or leftward from the straight running position; and a governor for governing operation of the control device in response to a running speed of the vehicle. The governor is operable to prohibit control of the front wheel transmission and side brakes when a propelling transmission is set to a high speed position, to allow control of the front wheel transmission and prohibit control of the side brakes when the propelling transmission is set to an intermediate speed position, and to allow control of the front wheel transmission and side brakes when the propelling transmission is set to a low speed position.
REFERENCES:
patent: 4669559 (1987-06-01), Fukui
patent: 4723622 (1988-02-01), Toshkuni et al.
patent: 4723623 (1988-02-01), Teraoka
patent: 4792009 (1988-12-01), Iritani
Hill Mitchell J.
Kubota Corporation
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