Patent ID: 8814741
Filing Date: 2014-08-26
Classification: B60W,F16H,Y10T

Abstract:
1. A drive device for a vehicle provided with an engine that is automatically shut down under a predetermined shutdown condition and is automatically restarted under a predetermined restart condition, the drive device comprising: a friction engagement mechanism that is provided in a power transmission path between the engine and a drive wheel and moves a hydraulic piston in an engagement direction to bring a friction plate into an engaged state and moves the hydraulic piston in a disengagement direction to cancel the engaged state of the friction plate; an oil pump that is driven by the engine and delivers hydraulic oil to the friction engagement mechanism for moving the hydraulic piston in the engagement direction or the disengagement direction; and an input clutch that is provided in the power transmission path and is switched to a disengaged state that disconnects the power transmission path or to an engaged state that connects the power transmission path on the basis of a shift operation performed by a driver, wherein a biasing unit for biasing the hydraulic piston toward an engagement direction is provided in the friction engagement mechanism to hold the friction engagement mechanism in a slipping state or an engaged state during an engine shutdown that causes the oil pump to be deactivated, and wherein the input clutch is switched to a disengaged state when a neutral position is selected, thereby disconnecting the engine from the drive wheel even during an engine shutdown that causes the friction engagement mechanism to be put into a slipping state or an engaged state.