Motor vehicles – Having four wheels driven
Patent
1986-10-30
1987-09-29
Pekar, John A.
Motor vehicles
Having four wheels driven
180 751, B60K 1734
Patent
active
046963650
ABSTRACT:
A four wheel drive vehicle with dirigible front wheels, comprising a main propelling drive transmission, and a front wheel drive transmission connected to the main transmission. The front wheel drive transmission is switchable between a first four wheel drive mode in which the front wheels and the rear wheels are driven at a substantially equal peripheral speed and a second four wheel drive mode in which the front wheels are driven at a higher peripheral speed than the rear wheels. The front wheel drive transmission includes a piston operable by a hydraulic control system including a control valve mechanically interlocked to a steering section of the vehicle for switching the front wheel drive transmission from the first drive mode to the second drive mode. The piston, which normally is biased toward a position for the first drive mode, is movable against the biasing force to a position for the second drive mode when the front wheels are steered to an angle exceeding a predetermined angle.
REFERENCES:
patent: 3763947 (1973-10-01), Longshore
patent: 4420059 (1983-12-01), Suzuki
patent: 4484653 (1984-11-01), Horikoshi et al.
patent: 4508190 (1985-04-01), Uchiyama
patent: 4574910 (1986-03-01), Miki et al.
patent: 4591177 (1986-05-01), Perlini
patent: 4605087 (1986-08-01), Ashauer et al.
Hirata Kazuo
Ishida Mikio
Ishiizumi Seiichi
Ishimori Shozo
Miki Hiroyuki
Kubota Ltd.
Pekar John A.
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