Power transmitting device for four-wheel drive vehicle

Details Power transmitting device for four-wheel drive vehicle Power transmitting device for four-wheel drive vehicle

1993-03-17

1994-10-11

Hill, Mitchell J.

Motor vehicles

Having four wheels driven

Including pump and fluid motor, or generator and electric...

74665T, 180 76, 180243, B60K 17348

Patent

active

053538897

ABSTRACT:
A power transmitting device for a four-wheel drive vehicle which includes main driven wheels driven directly by an engine and speed-change transmission, a left sub-driven wheel driven through a first hydraulic pressure clutch, a right sub-driven wheel driven through a second hydraulic pressure clutch, a first hydraulic pump driven in operative association with the main driven wheels, a second hydraulic pump driven in operative association with the left sub-driven wheel, a third hydraulic pump driven in operative association with the right sub-driven wheel, a first oil passage which connects a discharge port of the first hydraulic pump to intake ports of the second and third hydraulic pumps, and a second oil passage which connects the first oil passage to a working chamber in the first hydraulic pressure clutch and a working chamber in the second hydraulic pressure clutch. The three hydraulic pumps and hydraulic circuit are arranged such that the vehicle operates in a four-wheel drive mode only when the vehicle is first starting to travel and when the speed of the vehicle is increased. The vehicle operates in a main driven wheel drive mode when the vehicle is travelling at a constant speed and when the speed of the vehicle is reduced.

REFERENCES:
patent: 4681180 (1987-07-01), Oyama et al.
patent: 5117936 (1992-06-01), Nakamura et al.

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