Transfer case with integrated viscous coupling

Details Transfer case with integrated viscous coupling Transfer case with integrated viscous coupling

1994-09-12

1997-01-28

Marmor, Charles A.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Control of differential planetary gearing

475 74, 475 91, 192 5841, 180247, 180250, F16H 4826

Patent

active

055973698

ABSTRACT:
A transfer case for a four-wheel drive vehicle adapted to provide two- to four-wheel drive on-demand in the high range or four-wheel drive in the low range. The transfer case includes an input shaft coupled to the sun gear of a planetary gear set, a main drive shaft, a first output and a second output. Provided in fixed association with the main drive shaft is a viscous fluid coupling chamber, and associated with the chamber is a drive sprocket. A range clutch sleeve and locking clutch assembly is slidably disposed on the main drive shaft between the planetary gear set and the rotary member for selectively providing two- to four-wheel on-demand high range power, neutral, and four-wheel drive low range power. Inner and outer relatively rotational drum housings surround the aft end of the main drive shaft for defining an annular viscous fluid coupling chamber therebetween. The inner drum is splined to the main drive shaft for rotation with that shaft while the outer drum is fixedly connected with the rotary member for providing torque to the second output.

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1988 Acustar, Inc. Brochure, New Process Gear Division, Model 249 Electric Shift Full-Time 4WD Transfer Case (pp. 1 and 2).

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