| CPC H01F 7/081 (2013.01) [F16K 31/0675 (2013.01); H01F 7/16 (2013.01); F16K 31/0613 (2013.01); H01F 2007/086 (2013.01)] | 6 Claims |
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1. A solenoid valve, comprising:
a valve portion; and
a solenoid portion, wherein
the valve portion includes
a tubular sleeve extending along an axial direction with a port opening in a direction intersecting the axial direction, and
a spool that is inserted into the sleeve and slides in the axial direction so as to adjust an opening area of the port according to a position of the spool in the axial direction, wherein the spool includes a first portion and an end portion, and the end portion having a smaller diameter than the first portion,
the solenoid portion includes
a tubular coil portion that generates magnetic force when energized,
a magnetic yoke that have a side surface portion along the axial direction and a bottom portion formed along a direction intersecting the axial direction, and that accommodates the coil portion,
a columnar plunger that slides in the axial direction;
a stator core has
a tubular magnetic attraction core arranged in the axial direction to face a distal end surface of the plunger and configured to attract magnetically the plunger by a magnetic force generated by the coil portion,
a sliding core having a tubular core portion arranged inside the coil portion in a radial direction orthogonal to the axial direction and accommodating the plunger, and a magnetic flux transfer portion formed from a core end portion which is an axial end portion of the core portion and faces the bottom portion toward an outside in the radial direction so as to transfer magnetic flux between the yoke and the core portion, and
a magnetic flux passage suppressing portion configured to suppress passage of magnetic flux between the sliding core and the magnetic attraction core; and
a shaft that is provided between the plunger and the spool in the axial direction, inside the magnetic attraction core in the radial direction so as to transmit a thrust of the solenoid portion to the spool,
an axial length from a stator core end surface, which is an end surface of the stator core on the valve portion side, to the bottom portion of the yoke is equal to or longer than a total length of the shaft and the plunger in the axial direction,
when the shaft and the plunger move to the bottom portion side, the stator core end surface and a spool end surface, which is an end surface of the spool on the solenoid portion side come into contact with each other so as to restrict a movement of the spool to the solenoid portion side,
a groove portion, which communicates a space formed by the stator core, the spool, and the shaft with an accommodating portion in which the end portion of the spool on the solenoid portion side is accommodated when the stator core end surface and the spool end surface come into contact with each other, is formed on at least one of the stator core end surface and the spool end surface,
a communication hole is formed in the accommodating portion to communicate an inside and an outside of the accommodating portion,
the end portion of the spool has a larger diameter than a diameter of the shaft, and the spool end surface comes into contact with the stator core end surface,
the end portion of the spool is that portion of the spool that is closest to the shaft,
when the tubular coil portion of the solenoid portion is not energized, there is a gap between a tip of the shaft and the spool end surface, which is the end surface of the spool on the of the solenoid portion side, and
the end portion of the spool, having a smaller diameter than the first portion of the spool, is closer to the tubular coil portion than the first portion and includes the spool end surface.
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