Solenoid valve

A solenoid valve comprising:

• a valve portion including
• a sleeve extending in an axial direction, and
• a spool arranged in the sleeve to slide in the axial direction;
• and
• a solenoid portion including
• a coil that generates a magnetic force when being energized,
• a magnetic yoke housing the coil, the magnetic yoke having a side wall extended in the axial direction and a bottom formed to extend in a direction intersecting the axial direction,
• a plunger that slides in the axial direction, and
• a stator core, wherein a shaft is disposed at an end of the spool adjacent to the solenoid portion in the axial direction so as to transmit a thrust of the solenoid portion to the valve portion,
• the stator core includes
• a magnetic attraction core arranged to face a distal end surface of the plunger in the axial direction and configured to attract magnetically the plunger by the magnetic force generated by the coil,
• a sliding core having
• a core portion arranged inside the coil in a radial direction orthogonal to the axial direction and housing the plunger, and
• a magnetic flux transfer portion formed radially outward from a core end which is an end portion of the core portion in the axial direction and faces the bottom so as to transfer magnetic flux between the yoke and the core portion, and
• a magnetic flux passage suppresser configured to suppress passage of magnetic flux between the sliding core and the magnetic attraction core,
• the solenoid portion has a base portion made of a magnetic pipe arranged inside the yoke to be in contact with the yoke,
• the base portion has
• a first inner diameter portion having a first inner diameter in the radial direction,
• a second inner diameter portion located between the first inner diameter portion and the bottom in the axial direction and having a second inner diameter smaller than the first inner diameter,
• a connection surface connecting the first inner diameter portion and the second inner diameter portion in the radial direction,
• the first inner diameter portion is fastened to a first outer peripheral surface of an end portion of the sleeve adjacent to the solenoid portion in the axial direction,
• the second inner diameter portion is located radially outside a second outer peripheral surface of an end portion of the magnetic attraction core adjacent to the valve portion in the axial direction, and
• the connection surface and a sleeve end surface of the sleeve adjacent to the solenoid portion in the axial direction are spaced from each other in the axial direction.