Patent ID: 8147366

Claim:
A power output apparatus that outputs power to a drive shaft, said power output apparatus comprising: a power generation source capable of outputting power to a predetermined rotational element; an electric motor capable of outputting power; an accumulator capable of supplying and receiving electric power to and from said electric motor; a continuously variable transmission device capable of steplessly changing the speed of power inputted to an input shaft and outputting the power to an output shaft; a planetary gear mechanism that includes: a first input element connected to said output shaft of said continuously variable transmission device; a second input element rotatable in a direction opposite to a rotational direction of said rotational element in conjunction with said rotational element; and an output element connected to said drive shaft; a first connection and disconnection device that performs a connection and releases the connection between said input shaft of said continuously variable transmission device and a rotating shaft of said electric motor; a second connection and disconnection device that performs a connection and releases the connection between the rotating shaft of said electric motor and said rotational element; and an element fixing device capable of non-rotatably fixing said first input element of said planetary gear mechanism.