| 摘要 |
PURPOSE:To suppress decrease in oil viscosity by recirculating a surplus flow to a suction side through a bypass passage by a flow control valve changed in accordance with a delivery pressure of a pump, and recirculating the surplus flow through a cooling passage in addition to recirculating the surplus flow through the bypass passage, in the case of further increasing rotation of the pump to open the valve to a prescribed amount or more by increasing the delivery pressure, so as to cool pressure oil. CONSTITUTION:In a valve storage hole 1f, a supply passage 1c communicating with a delivery side of a pump 1 and a bypass passage 11 communicating with a suction side of the pump 1 are separated in the axial line direction, to open a cooling passage 12, communicating with a suction chamber of the pump 1, separated in the axial line direction from the supply passage 1c. A spool in slidably fitted to the valve storage hole 1f in order to close a communication path between the supply passage 1c and the bypass passage 11 and a communication path between the supply passage 1c and the cooling passage 12 and further in order to make opening degree adjustable of the respective communication paths. |
