| 主权项 |
1. A solenoid valve, comprising:
a tubular sleeve that has a supply port to which hydraulic fluid is supplied and an output port that outputs the hydraulic fluid; a spool valve that is housed in a valve hole formed in the sleeve so as to be movable in an axial direction of the solenoid valve, and that changes a flow passage area between the supply port and the output port by moving in the axial direction; a solenoid portion that operates upon reception of a supply of exciting current to push the spool valve toward one axial side; and an elastic member that urges the spool valve toward the solenoid portion, wherein a housing portion that is a bottomed hole is formed in an end portion of the spool valve so as to extend along a central axis of the spool valve, the end portion being on an opposite side of the spool valve from the solenoid portion, and a columnar piston member is slidably housed in the housing portion, the spool valve has an introduction hole through which a pressure of the hydraulic fluid output from the output port is introduced into a space between a bottom face of the housing portion and one end face of the piston member, an opening in an end portion of the sleeve, the end portion being on an opposite side of the sleeve from the solenoid portion, is closed by a plug, the plug has a protrusion that protrudes toward the spool valve and that is formed at a center portion of the plug, and a distal end face of the protrusion faces the other end face of the piston member, and the distal end face of the protrusion of the plug is located in the housing portion of the spool valve regardless of weather the solenoid portion is in a non-operating state or in an operating state. |
