Patent ID: 9689285
Date: 2017-06-27
CPC Classifications: F01L

Claim:
1. A solenoid valve for variable valve timing control devices which adjusts an amount of a working fluid fed or discarded to or from a variable valve timing control device equipped with a pushing member for pushing a rotor toward a direction of an advance angle, said solenoid valve comprising: a valve housing of cylindrical shape which includes a plurality of ports for supplying and discarding said working fluid to and from said variable valve timing control device; a spool moving within said valve housing in a direction of an axis thereof to adjust the fed or discarded amount of said working fluid flowing via said ports according to an amount of said movement, the spool including a plurality of lands each of which has a large-diameter portion, and recessed portions each of which has a small-diameter portion for connecting said plurality of lands with one another; a solenoid unit for driving said spool; and a groove portion for allowing the working fluid to flow through said groove portion toward the ports of the valve housing when the solenoid valve is controlled with a current which is close to an intermediate current value of control current supplied to the solenoid valve, the groove potion being formed in an edge portion of said plurality of lands so that the groove portion is formed discontinuously along a direction of a circumference of the land.