Power transmission apparatus for vehicle

Details Power transmission apparatus for vehicle Power transmission apparatus for vehicle

1984-11-13

1987-06-30

Pekar, John A.

Motor vehicles

Having four wheels driven

74732, 74733, 180248, B60K 1734

Patent

active

046763368

ABSTRACT:
In a power transmission apparatus for use in a vehicle of the type in which its front and rear wheels are driven by the same engine, a first rotary shaft transmitting drive force to the front wheels and a second rotary shaft transmitting drive force to the rear wheels are coupled to each other through a hydraulic oil pump which is driven according to the rotation speed difference between the first and second rotary shafts and delivers hydraulic oil of an amount corresponding to the rotation speed difference. The pressure of hydraulic oil delivered from the pump is controlled by hydraulic control means so as to automatically change over between the two-wheel drive mode in which the front or rear wheels only are driven and the four-wheel drive mode in which both the front and rear wheels are driven.

REFERENCES:
patent: 2872992 (1959-02-01), Schirmer

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