Solenoid device

A solenoid device for moving a shaft in an axial direction with a magnetic force generated by excitation of a coil, the solenoid device comprising:

• a yoke comprising a first cylindrical part that extends in the axial direction;
• a core positioned on the other side in the axial direction with respect to the yoke and comprising a second cylindrical part that extends in the axial direction;
• the shaft moving in the axial direction inside the second cylindrical part;
• a bobbin disposed on an outer side of the first cylindrical part and the second cylindrical part in a radial direction;
• the coil wound on the bobbin;
• a plunger moving in the axial direction inside the first cylindrical part;
• a lid positioned on one side in the axial direction with respect to the yoke and the plunger;
• and
• a housing housing the shaft, the yoke, the core, the bobbin, the coil, the plunger, and the lid,
• wherein the housing comprises a cylindrical housing body part, and
• the housing body part comprises:
• a first opening that opens at an end on one side in the axial direction;
• and
• a first inner wall part that is adjacent to the first opening and expands in a cylindrical shape in the axial direction on the outer side in the radial direction on an inner wall of the housing body part on one side in the axial direction,
• wherein the first inner wall part comprises an annular first step part that extends in the radial direction at an end on the other side in the axial direction,
• the first cylindrical part of the yoke comprises an annular first flange part that protrudes toward the outer side in the radial direction on one side of the first cylindrical part in the axial direction,
• the lid has a disk shape and comprises an annular circumferential edge part that extends toward the outer side in the radial direction,
• the yoke and the lid are fixed to the housing in a state where a first end surface of the first flange part on the other side in the axial direction is in contact with the first step part of the housing body part, and a surface on the other side in the axial direction of the circumferential edge part of the lid is in contact with a first end surface of the first flange part on one side in the axial direction,
• the second cylindrical part of the core has a first space, which opens on one side in the axial direction and is recessed toward the other side in the axial direction for inserting or removing the plunger that moves,
• the plunger has a second through hole that penetrates along the axial direction,
• the second through hole has a third opening that opens on the other side of the second through hole in the axial direction and is positioned on the outer side in the radial direction with respect to the shaft, as viewed in the axial direction,
• the first flange part of the yoke has a hole that opens at least on one side in the axial direction and extends toward the other side in the axial direction, and
• a second space, which communicates the second through hole with the hole when the plunger has moved to a retreat position in contact with the lid, is provided between an inner surface of the lid on the other side in the axial direction and the plunger and the yoke.