{TAIL ~ A planetary gear mechanism} combines the rotational drive force of a first shaft rotationally driven by a first rotary electric machine and the rotational drive force of a second shaft rotationally driven by {HEAD ~ a second rotary electric machine} and transmits the combined rotational drive force to a drive shaft with the rotational speed increased 
{ TAIL ~ A planetary gear mechanism } combines the rotational drive force of a first shaft rotationally driven by a first rotary electric machine and the rotational drive force of a second shaft rotationally driven by { HEAD ~ a second rotary electric machine } and transmits the combined rotational drive force to a drive shaft with the rotational speed increased
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