Speed-changing device

Details Speed-changing device Speed-changing device

2004-04-30

2008-08-26

Pang, Roger (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid pump and motor in one of plural paths to or from...

C475S078000, C475S083000

Reexamination Certificate

active

07416503

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 shaft3, an intermediate output shaft8, a planetary gear mechanism9, a first pump-motor7, and a second pump-motor15connected to the first pump-motor7, the input shaft3being coupled to a first element (planetary carrier12) of the planetary gear mechanism9, the second pump-motor15being coupled to a second element (sun gear19) of the planetary gear mechanism9, the intermediate output shaft8being coupled to a third element (ring gear16) of the planetary gear mechanism9, and the transmission further comprising a switching mechanism (synchromesh mechanism6) for selectively coupling the first pump-motor7to either the input shaft3or the intermediate output shaft8.

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