Solenoid valve and manufacturing method therefor
By providing a mountain-shaped mountain portion ( 5 a ) protruded from a surface of a plunger ( 5 ) facing a valve seat to the inside of a rubber member ( 8 ), a dimensional change amount of a valve seat abutting portion ( 8 a ) in an opening and closing direction decreases, and thus it is possible to suppress change in characteristic. Also, it is possible to secure a rubber deformation amount sufficient for absorbing impact when the valve seat abutting portion ( 8 a ) collides with the valve seat, thereby suppressing an operation sound.
1. A solenoid valve comprising:
a solenoid unit for generating electromagnetic attracting force;
a spring for generating biasing force in a direction opposite to a direction of the electromagnetic attracting force;
a plunger for reciprocating in directions of opening and closing a fluid passage by the electromagnetic attracting force and the biasing force;
a valve seat provided in the fluid passage;
a pin for restricting movement of the plunger caused by the electromagnetic attracting force;
a rubber member provided on a surface of the plunger facing the valve seat and on a surface of the plunger facing the pin and for abutting on the valve seat and the pin along with reciprocating movement of the plunger; and
a mountain-shaped mountain portion protruded from the surface of the plunger facing the valve seat to an inside of the rubber member, wherein
the rubber member includes a concave portion on a side surface, the concave portion being an open cavity.
2. The solenoid valve according to claim 1 , wherein the concave portion has a semicircular cross section.
3. The solenoid valve according to claim 1 , wherein the pin is made of resin.
4. The solenoid valve according to claim 1 , wherein at least one of a surface of the pin which abuts on the rubber member and a surface of the rubber member which abuts on the pin has a convex shape or a concave shape.
5. The solenoid valve according to claim 1 , wherein the solenoid valve controls a flow rate of evaporation gas flowing from a canister to an engine of a vehicle.
6. A method of manufacturing a solenoid valve, the solenoid valve including:
a solenoid unit for generating electromagnetic attracting force;
a spring for generating biasing force in a direction opposite to a direction of the electromagnetic attracting force;
a plunger for reciprocating in directions of opening and closing a fluid passage by the electromagnetic attracting force and the biasing force;
a valve seat provided in the fluid passage;
a pin for restricting movement of the plunger caused by the electromagnetic attracting force;
a rubber member provided on a surface of the plunger facing the valve seat and on a surface of the plunger facing the pin and for abutting on the valve seat and the pin along with reciprocating movement of the plunger; and
a mountain-shaped mountain portion protruded from the surface of the plunger facing the valve seat to an inside of the rubber member,
the method comprising:
molding the rubber member integrally with the plunger after applying an adhesive to the mountain portion provided on the plunger, the rubber member including a concave portion on a side surface,
wherein the concave portion remains an open cavity after assembling the solenoid valve.
7. The method of manufacturing the solenoid valve according to claim 6 , wherein the concave portion is molded on the side surface of the rubber member by a mold which opens in a same direction as a reciprocating direction of the plunger and forced extraction is performed.