Patent ID: 8635923

Claim:
A vehicle drive system, comprising: a first gear train for transmitting a driving force outputted from a first drive source as a torque to an output shaft, the first gear train establishing a plurality of shift stages; a second gear train for transmitting a driving force outputted from a second drive source as a torque to the output shaft, the second gear train establishing a plurality of shift stages; and a main connecting-disconnecting mechanism connecting and disconnecting a predetermined rotational element provided at the first gear train and a predetermined rotational element provided at the second gear train; wherein the vehicle drive system is configured to transmit the torque from the first drive source to the output shaft via the first gear train, the main connecting-disconnecting mechanism, and the second gear train, and to transmit the torque from the second drive source to the output shaft via the second gear train when the predetermined rotational element at the first gear train and the predetermined rotational element at the second gear train are connected by the main connecting-disconnecting mechanism; wherein the vehicle drive system is configured to transmit the torque from the first drive source to the output shaft via the first gear train, and to transmit the torque from the second drive source to the output shaft via the second gear train when the predetermined rotational element at the first gear train and the predetermined rotational element at the second gear train are disconnected by the main connecting-disconnecting mechanism; wherein the first gear train includes an input shaft for first gear train to which the torque from the first drive source is inputted, a first drive gear for first gear train idly provided to be rotatable relative to the input shaft for first gear train, a second drive gear for first gear train idly provided to be rotatable relative to the input shaft for first gear train and having a diameter different from a diameter of the first drive gear for first gear train, a first connecting-disconnecting mechanism for first gear train selecting one of the first drive gear for first gear train and the second drive gear for first gear train for connecting and disconnecting the selected drive gear relative to the input shaft for first gear train, a first idler gear for first gear train meshed with the first drive gear for first gear train, a second idler gear for first gear train meshed with the second drive gear for first gear train and integrally rotating with the first idler gear for first gear train, a first driven gear for first gear train idly provided to be rotatable relative to the output shaft and meshed with the first drive gear for first gear train, and a second connecting-disconnecting mechanism for first gear train connecting and disconnecting the first driven gear for first gear train relative to the output shaft; and wherein the predetermined rotational element provided at the first gear train is the first drive gear for first gear train.