Speed-changing device

Details Speed-changing device Speed-changing device

2007-12-20

2008-11-11

Pang, Roger (Department: 3681)

Planetary gear transmission systems or components

Input from independent power sources

Including electric motor input

C475S150000

Reexamination Certificate

active

07448976

ABSTRACT:
A transmission is provided which has a very compact system configuration and is capable of exerting high energy efficiency over all speed regions from a low speed region to a high speed region, while providing improved operability free from a torque shortage. To this end, the transmission has an input shaft, an intermediate output shaft, a planetary gear mechanism, a first pump-motor, and a second pump-motor connected to the first pump-motor, the input shaft being coupled to a first element of the planetary gear mechanism, the second pump-motor being coupled to a second element of the planetary gear mechanism, the intermediate output shaft being coupled to a third element of the planetary gear mechanism, and the transmission further comprising a switching mechanism for selectively coupling the first pump-motor to either the input shaft or the intermediate output shaft.

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