Drive system for two pairs of wheels

Details Drive system for two pairs of wheels Drive system for two pairs of wheels

1987-12-21

1990-01-23

Hill, Mitchell J.

Motor vehicles

Having four wheels driven

180247, 180248, 180249, B60K 17346, B60K 2308, B60T 832

Patent

active

048952176

ABSTRACT:
A drive system for a four-wheel drive motor vehicle, in particular an agricultural tractor, includes a gradually lockable differential for the front wheels, a gradually lockable differential for the rear wheels, and a gradually lockable center differential in the drive to the front and rear differential gears. The degree of locking of the respective differentials is controlled by a control circuit based upon their relative rotational speeds, the steering angle and the temperature in the center differential. In an alternative embodiment, brakes on each wheel and on the shafts connecting the center differential to the front and rear differential are used to supplement or replace the differential locks.

REFERENCES:
patent: 3400777 (1968-09-01), Hill
patent: 3748928 (1973-07-01), Shiber
patent: 3923113 (1975-12-01), Pagelin
patent: 4318823 (1982-03-01), Wetrich et al.
patent: 4552241 (1985-11-01), Suzuki
patent: 4644823 (1987-02-01), Mueller
patent: 4700797 (1987-10-01), Leiber
patent: 4776444 (1988-10-01), Worner

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