Patent ID: 9297471
Filing Date: 2016-03-29
CPC Classification: F02M,F16K

Claim Text:
1. A solenoid valve comprising: a coil that is configured into a tubular form, wherein the coil generates a magnetic field when the coil is energized; a stator core that is received on a radially inner side of the coil, wherein the stator core generates a magnetic attractive force when the coil is energized; an armature that has one end surface, which is opposed to the stator core, wherein the armature is magnetically attracted to the stator core by the magnetic attractive force when the coil is energized; a valve element that is moved along with the armature to open and close a liquid passage; a spring chamber that is formed in the stator core; a spring that is received in the spring chamber and urges the armature in a direction away from the stator core; and an armature chamber that receives the armature, wherein: the armature chamber includes: the armature includes a primary communication passage that communicates between the first armature chamber and the second armature chamber; an opening end of the primary communication passage, which opens on a side where the first armature chamber is located, is placed at a corresponding location of the armature, which is opposed to the spring chamber; the armature includes a secondary communication passage that communicates between the first armature chamber and the second armature chamber; an opening end of the secondary communication passage, which opens on the side where the first armature chamber is located, is placed in a corresponding portion of the one end surface of the armature, which is opposed to the stator core, and the opening end of the secondary communication passage is radially outwardly displaced from the spring chamber; when the armature is magnetically attracted to the stator core by the magnetic attractive force at a time of energizing the coil, the armature is entirely kept away from the stator core throughout the time of energizing the coil to maintain the first armature chamber between the armature and the stator core and to communicate the first armature chamber with the spring chamber; wherein the primary communication passage includes: a spring receiving hole that receives the spring and has one end, which opens on the side where the first armature chamber is located; and a connection hole that communicates between the second armature chamber and the spring receiving hole; and the spring receiving hole includes a bottom wall surface and an inner peripheral wall surface; and the connection hole opens in the inner peripheral wall surface of the spring receiving hole.