Patent ID: 6968816

Claim:
An oil flow control valve comprising: a spool valve including a sleeve formed with oil input/output ports and a spool adapted to displace axially in the interior of the sleeve to switch over the input/output ports; an electromagnetic actuator, the electromagnetic actuator including a coil which when energized generates a magnetic force, a plunger disposed axially movably, and a stator which conducts the magnetic force generated by the coil to an axial position of the plunger opposed to the stator, the plunger being attracted to the stator with the magnetic force generated by the coil; a shaft which transmits an axial movement of the plunger to the spool, and transmits an axial movement of the spool to the plunger; and an urging means for urging the plunger and the spool in a direction in which an opposed distance between the plunger and the stator becomes longer, the electromagnetic actuator further including a first volume varying chamber formed axially in the plunger on the side opposed to the stator, and a second volume varying chamber formed axially in the plunger on the side different from the first volume varying chamber, the spool valve including a third volume varying chamber formed axially in the spool on the electromagnetic actuator side and a fourth volume varying chamber formed axially in the spool on the side different from the third volume varying chamber, the sleeve including a breathing hole communicating with an external oil path, and the first and second volume varying chambers being brought into communication with the breathing hole at least through both the interior of the shaft and the interior of the plunger.