Patent ID: 7609011

Claim:
An electric force transmission device capable of transmitting a motor generator's driving force into drive shafts of a vehicle, comprising: a first motor generator; a second motor generator; an output shaft that outputs a driving force generated from the transmission device; a first rotating member coupled to the first motor generator; a second rotating member coupled to the second motor generator; a third rotating member coupled to the output shaft; a differential device having the first, the second, and the third rotating members and having two degrees of freedom that, when rotating states of two of the three rotating members are determined, a rotating state of the other is determined, and in which the third rotating member is laid out to be located between the first and the second rotating members on an alignment chart; and a controller configured to control the first motor generator and second motor generator such that, when a driving achieved by only power from the first motor generator and the second motor generator is equivalent to driving started from a state of an output rotational speed of zero, before the driving is started, the first motor generator and the second motor generator are rotated oppositely to each other, while keeping the state of the output rotational speed at zero.