Control system for a selectable four-wheel drive transmission

Details Control system for a selectable four-wheel drive transmission Control system for a selectable four-wheel drive transmission

1997-06-23

1999-12-07

Graham, Matthew C.

Motor vehicles

Having four wheels driven

180248, B60K 1734

Patent

active

059967196

ABSTRACT:
A transmission is provided for a tractor having a rear permanently engaged drive axle and a front selectively engaged drive axle and includes a coupling for selectively applying torque to the front drive axle of the vehicle to switch between two wheel drive and four-wheel drive in dependence upon slipping of the wheels of the rear axle. The coupling includes first and second gears, arranged to rotate with the rear and front axles, respectively, and having teeth which mesh with one another, and a rotary fluid valve sensitive to the rear wheel slip dependent relative angular position of the first and second members for actuating a jacking device that is operative to enable and disable the transmission of drive torque through the coupling to the front axle.

REFERENCES:
patent: 4605084 (1986-08-01), Haynes et al.
patent: 4781265 (1988-11-01), Weiler et al.

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