Planetary gear transmission systems or components – Plural power paths to planetary gearing – Plural planetary units
Patent
1991-08-09
1992-12-15
Braun, Leslie A.
Planetary gear transmission systems or components
Plural power paths to planetary gearing
Plural planetary units
475230, 475242, 475248, 475252, F16H 350, F16H 356, F16H 370, F16H 374
Patent
active
051711940
ABSTRACT:
A bifurcated variable ratio drive transmission employs a pair of series connected differential gear stages. In a fist stage, torque flow from the engine output shaft is bifurcated into major and minor flow branches; in the second stage, the branches are combined. An engine output shaft drives an input ring gear of the first stage with the ring gear engaging a plurality of stepped planet gears. The planet gears in turn, drive both a sun gear of the first stage and a transfer ring gear. A major portion of torque flow is transmitted to the second stage through the transfer ring gear while a minor portion of torque flow passes from the sun gear of the first stage to the sun gear of the second stage. The transfer ring gear is fixed to a carrier to which are mounted pairs of radially spaced interengaged planet gears. Torque flow from the sun gear is amplified through the second stage planet gear pairs and combined with torque flow from the second stage carrier to drive the second stage ring gear which is connected to an output shaft.
REFERENCES:
patent: 2641143 (1953-06-01), Saraceni
patent: 3429200 (1969-02-01), Green
patent: 4235125 (1980-11-01), Perlin
patent: 4334440 (1982-06-01), Fonck
patent: 4598610 (1986-07-01), Kim
patent: 4625588 (1986-12-01), Brickley
patent: 4700589 (1987-10-01), Coronel
patent: 4854190 (1989-08-01), Won
patent: 4916975 (1990-04-01), Combastet
patent: 5013289 (1991-05-01), Van Maanen
Braun Leslie A.
Henn David E.
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