Patent ID: 8181548

Claim:
A power transmission apparatus comprising: a rotating electric device that includes a rotor and a stator; a speed reducer that reduces a speed of rotation output from the rotating electric device, and that is lubricated by oil; and a case in which the rotating electric device and the speed reducer are housed; wherein the speed reducer includes: a first drive gear provided on a first shaft connected to the rotating electric device; a first driven gear that engages with the first drive gear, and that is provided on a second shaft that is parallel to the first shaft; a second drive gear provided on the second shaft; and a second driven gear that engages with the second drive gear, and that rotates coaxially with the first shaft so that a rotational speed of the second driven gear is lower than a rotational speed of the first shaft; a lower end of the stator is disposed at a position lower than a lower end of the second driven gear and a lower end of the first driven gear, in the case; a lower end of the rotor is disposed at a position higher than the lower end of the second driven gear and the lower end of the first driven gear, in the case; and the lower end of the stator, the lower end of the second driven gear, the lower end of the first driven gear, and the lower end of the rotor are disposed in a stated order in a direction from a lower position to an upper position, in the case.