| 摘要 |
<p>A solenoid valve comprises a solenoid portion 10 and a valve portion 20. The solenoid portion 10 is constructed by a stator core 12, an electromagnetic coil 14 and a plunger 15. The valve portion 20 is constructed by a valve sleeve 21 and a spool 25 axially forming plural lands 26a-26c in series. The plunger 15 is axially moved by electromagnetic attraction and drives the spool 25. There are formed the same pressurized areas at the plunger 15 and the land of the spool 25 closest to the plunger 15. Therefore, the volume in an intermediate space B between the plunger 15 and the spool 25 is constant and contaminants in the oil are not sucked into the intermediate space B.</p> |
