Planetary gear transmission systems or components – Input from independent power sources – Including electric motor input
Patent
1992-09-30
1994-05-10
Wright, Dirk
Planetary gear transmission systems or components
Input from independent power sources
Including electric motor input
475 8, F16H 138
Patent
active
053103874
ABSTRACT:
A differential epicyclic power train comprising a differential epicyclic gear train coupled to two or more motors. The differential epicyclic gear train sums the inputs from the motors such that the output speed is a linear function of the input speeds of the respective motors. A brake/clutch assembly may be coupled between one or both of the motors and the differential epicyclic gear train. Various combinations of brake and clutch assemblies, and high and low power motors may be employed to achieved differing output speeds and power levels. The present invention optimizes the efficiency of the single output of the differential epicyclic gear train over the speed range of the motors. The efficiency of the power train is maximized by maximizing the amount of time each motor remains in higher efficiency regions of operation by limiting the speed range of a selected one of motors. The resulting efficiency is greater than the efficiency that is produced by a single high power variable speed motor. The present invention may be employed with motor drives of all types, but is particularly useful with motor drives for electric and hybrid automobiles, where vehicle efficiency is of prime importance, to maximize range, battery life and operating costs.
REFERENCES:
patent: 1130053 (1915-03-01), Barnum
patent: 1667718 (1928-05-01), Connell
patent: 3260133 (1966-07-01), Mattson
patent: 4579019 (1986-09-01), Gabriele
patent: 4685354 (1987-08-01), McCabria
patent: 4834319 (1989-05-01), Ewy et al.
Alkov L. A.
Denson-Low W. K.
Hughes Aircraft Company
Wright Dirk
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