Drive device for vehicle

摘要

There is provided a drive device for a vehicle. A forward clutch that is engaged during forward driving is provided in a power transmission path between an engine and a drive wheel. A spring is incorporated in an engagement oil chamber of the forward clutch, thereby causing the forward clutch to be held in a slipping state or an engaged state through the spring force even during an idling stop that suffers from reduced control oil pressure. This arrangement can prevent the forward clutch from producing an engagement shock during an engine restart. In addition, an input clutch driven by an electric actuator is provided in the power transmission path. With this arrangement, neutral control can be performed by disengaging the input clutch even if the forward clutch which is to be held in a slipping state or an engaged state is provided.

主权项

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.