Patent ID: 8376905

Claim:
A vehicle drive device, comprising: a speed change mechanism; a fluid transmission device provided closer to an engine attachment side than the speed change mechanism is and including a lock-up clutch; an electric motor having a rotor and a stator and connecting the rotor to an input portion of the fluid transmission device; and an engine power cut-off clutch that transmits or cuts off a driving force of an engine to or from the fluid transmission device, wherein: the lock-up clutch includes a plurality of friction plates and a hydraulic actuator that presses the friction plates, and is disposed closer to the engine attachment side than a torus is in the fluid transmission device, and the friction plates are disposed between an outer diameter portion of the torus and a front cover of the fluid transmission device; the engine power cut-off clutch includes a plurality of friction plates and a hydraulic actuator that presses the friction plates, is disposed closer to the engine attachment side than the torus is in the fluid transmission device, and is formed with a diameter smaller than an outer diameter of the lock-up clutch; the electric motor is disposed so as to axially overlap the engine power cut-off clutch friction plates on an outer diameter side of the engine power cut-off clutch; each of the lock-up clutch actuator and the engine power cut-off clutch actuator includes a piston that presses the friction plates, and a fluid-tight engagement pressure chamber to which an engagement pressure for operating the piston to engage the clutch is supplied; the engagement pressure chamber of the engine power cut-off clutch actuator is formed by the engine power cut-off clutch piston and the front cover; and the engagement pressure chamber of the lock-up clutch actuator is formed by the lock-up clutch piston and a turbine hub.