Patent ID: 8413783

Claim:
A power transmission device installed in a vehicle, comprising: a clutch that transmits power from a motor to an axle; a first pump that is driven by power from the motor to generate and output fluid pressure; a second pump that receives and is driven by a supply of electric power to generate and output fluid pressure; a line pressure generating valve that is operated by operation fluid input to an operation input port, and regulates fluid pressure output from the first pump to generate a line pressure for engaging the clutch; and a switching valve that switches between a first connection state, wherein when the first pump is driving, operation fluid output from the second pump is supplied to the operation input port of the line pressure generating valve and a supply of operation fluid from the second pump to the clutch is cut off, and a second connection state wherein, when the first pump is not driving, operation fluid output from the second pump is supplied to the clutch and the supply of operation fluid from the second pump to the operation input port of the line pressure generating valve is cut off.