| 摘要 |
PURPOSE:To facilitate the assembly and disassembly of a fluid control unit, by enabling an electromagnetic flow rate control valve controlled in accordance with the speed of a vehicle, etc. to be directly incorporated in a valve hole in a pump body, and by incorporating a fixed restrictor orifice memter in a valve hole. CONSTITUTION:In an arrangement in which hydraulic pressure from a pump device 50 including an engine drive vane type pressure generating means 51 is fed to a reaction mechanism (not shown) is a power steering device, the pump body 52 of the pump device 50 are formed therein with valve first and second valve holes 53, 54 into which flow regulating spools 55, 56 are slidably fitted, respectively. A bypass passage 79 communicated to the suction side of the pump device 20 is connected to the second valve hole 54, and is opened and closed by the above-mentioned spool 56 which is urged by a spring 66. Further, hydraulic oil between a fixed oirifice 71a and a control section 72 whose opening area is changed in association with the operation of a solenoid valve 67 secured to an opening section on the front chamber 63 side defined by the spool 56, is led to the reaction mechanism. |
