Transfer case with dual planetary gear reduction unit

Details Transfer case with dual planetary gear reduction unit Transfer case with dual planetary gear reduction unit

1988-05-23

1989-06-06

Braun, Leslie A.

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74674, 74705, F16H 344, F16H 3706

Patent

active

048360538

ABSTRACT:
A dual planetary gear reduction assembly for a two-wheel/four drive vehicle transfer case mechanism providing an exact two-to-one gear reduction ratio during full-time four wheel drive operation. The dual planetary is uniquely designed to provide a grounded carrier supporting inner and outer sets of planetary gears operative to rotate an ungrounded annulus gear and a meshing annulus plate in the same direction as the input shaft. A sun gear, having a predetermined number of helical teeth, is formed on the input shaft while the annulus gear has a predetermined number of internal teeth exactly twice the number of sun gear teeth. A clutch collar is internally splined on the output shaft and has external splines operative, when the collar is shifted into its low-range mode, to engage internal splines on the annulus plate and drive the transfer case output shaft at the two-to-one gear reduction ratio.

REFERENCES:
patent: 2194823 (1940-03-01), Dooley
patent: 2458070 (1949-01-01), Gilbert
patent: 2588462 (1952-03-01), Baker et al.
patent: 2653491 (1953-09-01), Creber
patent: 2933952 (1960-04-01), Schou
patent: 3060765 (1960-04-01), Rinsoz
patent: 4074591 (1978-02-01), Dick
patent: 4188838 (1980-02-01), Nakao et al.
patent: 4677873 (1987-07-01), Eastman et al.
patent: 4690015 (1987-09-01), Nagano et al.
patent: 4711136 (1987-12-01), Yoshinaka et al.
patent: 4782721 (1988-11-01), Dick

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