Patent ID: 7737595

Claim:
A hybrid vehicle comprising: an internal combustion engine; a first drive shaft which transmits a driving force of the internal combustion engine; a generator connected to the first drive shaft; a motor; a second drive shaft which transmits the driving force of the motor to wheels; and an engaging/disengaging means which implements engagement/disengagement between the second drive shaft and the first drive shaft, wherein the motor includes a first rotor having a plurality of permanent magnets arranged in a circumferential direction, a second rotor which is disposed coaxially with the first rotor and provided relatively rotationally with respect to the first rotor and which has a plurality of permanent magnets arranged in the circumferential direction, and a relative rotational force generating means which generates a driving force for relatively rotating the first rotor and the second rotor by a working fluid, one rotor is relatively rotated with respect to the other rotor through the intermediary of the relative rotational force generating means to change the phase difference between the two rotors thereby to allow the intensity of a resultant magnetic flux of the permanent magnets of the two rotors to be changed, and the phase difference between the two rotors is balanced at a predetermined phase difference which causes the intensity of the resultant magnetic flux to be lower than a maximum intensity by a magnetic force acting between the permanent magnets of the first rotor and the permanent magnets of the second rotor in a state in which the relative rotational force generating means stops generating the driving force, the engaging/disengaging device is a means which is operated by a working fluid, and the hybrid vehicle further comprises an electrically-operated first pump provided to be able to supply a working fluid to the relative rotational force generating means and the engaging/disengaging means, a second pump which is a mechanical pump driven by the internal combustion engine or an electrically-operated pump and which is provided to be able to supply a working fluid to the engaging/disengaging device, and a supply switching means for selectively switching a source of supply of the working fluid to the engaging/disengaging means to either the first pump or the second pump.