Full time power transfer case

Details Full time power transfer case Full time power transfer case

1990-02-14

1991-07-09

Diehl, Dwight

Planetary gear transmission systems or components

Variable speed or direction transmission combined with...

Variable speed or direction is planetary transmission

475 86, F16H 3708

Patent

active

050301829

ABSTRACT:
An automatic power shift transfer case for a four wheel drive vehicle has a front high-low range planetary gear set and a rear differential planetary gear set aligned symmetrically about the transfer case central shaft axis. The front and rear planetary gear sets are arranged in a back-to-back substantially mirror image manner so as to share a common carrier interposed therebetween. The front planetary gear set with either its low or high range clutch applied selectively delivers a corresponding speed through the common carrier to the rear planetary gear set. The torque flow is split in a predetermined manner wherein a minimum torque to maximum may be selectively delivered to the rear axle, via a rear planetary gear set modulating clutch while the remaining torque is normally delivered to the front axle. Lock-up of the modulating clutch allows the front axle to be disconnected providing a two-wheel drive mode.

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patent: 4878399 (1989-11-01), Kameda
patent: 4898259 (1990-02-01), Fujitani et al.

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