Hybrid vehicle drive apparatus

A hybrid vehicle drive apparatus in which an alternating current motor is connected to a crank shaft between an internal combustion engine and a transmission,

• wherein said alternating current motor comprises:
• a motor housing connected between the internal combustion engine and the transmission;
• a stator constituted by arranging a plurality of stator pieces so as to form a ring shape, each of said stator pieces is constituted by stator core teeth;
• a stator hold ring having an opening portion corresponding to an outer peripheral shape of said stator core teeth arranged so as to form a ring shape and structured such that said stator is press-fitted to said opening portion and contacts the outer peripheral shape of said stator core teeth;
• and
• fixing means for fixing said stator hold ring to said motor housing, and
• wherein a coefficient of thermal expansion of said stator core teeth substantially coincides with a coefficient of thermal expansion of said stator hold ring so that a fitting condition between the outer peripheral shape of said stator core teeth and said opening portion is not loosed by the temperature change of said stator core teeth and said stator hold ring.