The present invention relates to a two degrees-of-freedom compound planetary
gear train with two conjoined planetary gear trains and four torque-transfer
devices. The different combinations of states of various torque-transfer
devices yield multiple modes of opration. The planetary gear train allows
the addition of power of two prime-movers to drive the load. In addition
it also allows splitting the power from one prime-mover into requirements
of the energy storage system while catering to the output needs. This it
achieves in a manner so as to limit the re-circulating power to a fraction
of the input power. Other advantage of the transmission is that it provides
a high overdrive ratio, which permits regeneration even at moderate speeds.
The transmission obviates the need for a torque converter. The transmission
can oprate as multi-speed, fully automatic.
Indian patent application no. 1075/MUM/2004 European patent grant no. EP1817195B1
Inventors: B Seth and D Chachra