PRESSURE OIL SUPPLY CIRCUIT STRUCTURE IN POWER TRANSMISSION DEVICE OF VEHICLE

PROBLEM TO BE SOLVED: To reduce wastefulness (a pump loss) of a mechanical pump, by reducing a supply flow rate of the mechanical pump driven by an engine, and compensating for flow rate shortage by an electric pump when the flow rate shortage is caused due to the reduction of the supply flow rate.SOLUTION: This pressure oil supply circuit structure includes the mechanical pump 120 driven by the engine and the electric pump 130 rotatingly driven in both reciprocal directions by a motor, as an oil pump device, and is formed as a circuit constitution capable of compensating for a shortage flow rate by the pressure oil supplied by the rotational driving to the other direction of the electric pump 130 when the supply flow rate to a low pressure use device part D2 of the pressure oil supplied when driving the mechanical pump 120 is insufficient, and supplying pressure oil to a specific operation mechanism pressure supply part D1-1 by rotational driving to one direction of the electric pump 130 when the mechanical pump 120 is not driven.