| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain a spool valve from being stuck due to inclusion of foreign matter in hydraulic oil. <P>SOLUTION: This control valve is composed of: a valve housing hole 17 provided at an oil pump 10; a bottomed cylindrical valve element 18 movably housed in the valve housing hole 17; a variable orifice 14 provided at an oil discharge passage of the oil pump 10; a pressure supply hole 19 for supplying downstream side pressure of the variable orifice 14 to the left side of the valve housing hole 17; a pressure supply hole for supplying upstream side pressure of the orifice 14 to the right side of the valve housing hole 17; a spring 20 which supports the valve body 18 to the right side; a drained oil passage 21 which is opened at the valve housing hole 17 and drains the high pressure working oil in the valve housing hole 17 to the low pressure side; and a communicating hole 23 which communicates the inside with the outside of a cylindrical portion 18a in a diametrical direction. <P>COPYRIGHT: (C)2007,JPO&INPIT |
