Operating apparatus for four-wheel drive vehicle

Details Operating apparatus for four-wheel drive vehicle Operating apparatus for four-wheel drive vehicle

1990-04-02

1991-10-15

Herrmann, Allan D.

Planetary gear transmission systems or components

Differential planetary gearing

Differential or nondifferential planetary combined with...

180248, 180249, 475223, B60K 1734

Patent

active

050570625

ABSTRACT:
A transfer case operation mode shifting apparatus used on a vehicle equipped with part-time four-wheel drive which having a center-differential shiftable between a differential-locked and differental-free drive mode of operation and between a two-wheel and a four-wheel drive mode of operation and a transfer shiftable between a high-speed range and a low-speed range drive mode of operation. The transfer case is shifted in its drive mode of operation by an operation mode selecting member for selecting a desired drive mode of operation. A power drive operation mode shifting device is provided in cooperation with the drive mode selecting member and a controller to actually shift the transfer case from one drive mode of operation to another. The controller is adapted to detect that the center-differential gear assembly of the transfer case is in a differential-locked four-wheel drive mode of operation so as to inhibit a transition of the center-differential to a two-wheel drive mode of operation.

REFERENCES:
patent: 3895546 (1975-07-01), Yamaguchi et al.
patent: 4592442 (1986-06-01), Wilson et al.
patent: 4722414 (1988-02-01), Ruhringer et al.
patent: 4723622 (1988-02-01), Toshikuni et al.
patent: 4771853 (1988-09-01), Nishikawa
patent: 4804061 (1989-02-01), Kameda
patent: 4883138 (1989-11-01), Kameda et al.

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