Patent ID: 6179005
Filing Date: 2001-01-30
Classification: F16K,Y10T

Abstract:
A spool valve type electromagnetic valve comprising:a linear solenoid;a valve body provided with a bore and having a connecting end that is connected to the linear solenoid, said valve body including an inlet port, an outlet port and a drain port that are in fluid communication with the bore;a spool fitted in the bore for sliding movement, said spool being urged in one direction by a spring which applies an urging force to the spool, said spool being in a counter balanced condition by an output force of the linear solenoid and an urging force of the spring, the spool being moved to effect an inverse proportional control of an opening area of a passage extending from the inlet port to the outlet port relative to an opening area of a passage extending from the outlet port to the drain port;said linear solenoid comprising a resin-made bobbin, a rear yoke around which a coil is wound, a plunger movably fitted in the rear yoke, a front yoke positioned in the resin-made bobbin in coaxial alignment with both the rear yoke and the connecting end of the valve body, the front yoke, the rear yoke and the resin-made bobbin forming an insert molded integrated structure, and an alignment facilitating portion provided between the front yoke and the valve body.