Four-wheel drive vehicle

Details Four-wheel drive vehicle Four-wheel drive vehicle

1988-10-27

1991-04-09

Hill, Mitchell J.

Motor vehicles

Having four wheels driven

With manually operated means for disengaging drive to one or...

180248, 180249, 180250, B60K 1735, B60K 17352

Patent

active

050056638

ABSTRACT:
A vehicle equipped with four-wheel drive has a transfer case including a center-differential which delivers driving power to both front and rear axle assemblies when needed and is shiftable between a two-wheel and a four-wheel drive mode of operation and between a differential-locked and a differential-unlocked drive mode of operation. A free wheeling drive mechanism with a clutch member is incorporated in an output shaft of an axle differential in association with wheels non-driven in the two-wheel drive mode of operation and is adapted to disconnect when the vehicle is in the two-wheel drive mode of operation. A controller causes a forced drive mode shift of the center-differential from the four-wheel differential-underlined drive mode of operation either to the four-wheel differential-locked or to the two-wheel drive mode of operation when the disconnection of the free-wheeling drive mechanism is detected while the vehicle is in the four-wheel differential-unlocked drive mode of operation.

REFERENCES:
patent: 4690239 (1987-09-01), Takahashi et al.
patent: 4729450 (1988-03-01), Morisawa et al.
patent: 4744435 (1988-05-01), Schnurer
patent: 4751856 (1988-06-01), Nakamura et al.
patent: 4779698 (1988-10-01), Iwata
patent: 4792012 (1988-12-01), Morisawa et al.
patent: 4817753 (1989-04-01), Hiketa
patent: 4867262 (1989-09-01), Takada et al.

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