| 摘要 |
PURPOSE:To stabilize the maneuverability in a high speed running, and to secure a constant flow rate to a power steering device, by providing a bypass solenoid valve to convert the opening area of a bypass passage according to the car speed, and a bypass control valve to reduce the opening area from the bypass according to the increase of the pressure difference. CONSTITUTION:In a flow rate control device which has a flow rate control valve 15 to control the pressure oil to a power steering device from a pump 10 at a constant flow rate according to the pressure difference at the front side and the rear side of a measuring orifice 13, a bypass passage 23 to bypass the oil flowing through a leading-in passage 22 combining the downstream of the measuring orifice 13 and the flow rate control valve 15, to the lower pressure side, is provided. And the system is composed that the opening area of the bypass passage 23 is to be controlled by a bypass solenoid valve 25 according to the car speed, and the opening area from the bypass passage 23 to the lower pressure side is controlled by a bypass control valve 30 to reduce according to the increase of the pressure difference of the oil pressure at the bypass solenoid valve 25 and at the downstream of the measuring orifice 13. |
