Patent ID: 8651827

Claim:
An electromagnetically-driven valve mechanism comprising: a valve member disposed at a fluid inlet port; a movable plunger operated by an electromagnetic force; a spring member biasing the movable plunger in a direction opposite the electromagnetic force; and an electromagnetic drive mechanism for operating the valve member through the movable plunger against the spring member by electromagnetically biasing the movable plunger to open and close the fluid inlet port; the electromagnetic drive mechanism including a core portion adapted to receive the movable plunger inserted therethrough, an annular or cylindrical electromagnetic coil portion attached around the core portion, a cylindrical yoke portion surrounding the outside of the electromagnetic coil portion, a resin-molded body composed of the electromagnetic coil portion and the yoke portion, a connector portion formed integrally with the resin-molded body so as to be used for connection with external equipment, and an external connection terminal made of a conductor and mounted to the connector portion; wherein a welded portion that connects an end of a lead line forming the electromagnetic coil portion and one end of the external connection terminal is disposed externally of the yoke portion; the core portion is mounted in a cylindrical space defined by an inner circumferential surface of the resin-molded body; the resin-molded body is fixedly press-fitted into an outer circumference of the core portion at an open end of the yoke portion; and an inner diameter of a section of the inner circumferential surface of the resin-molded body that contacts the core portion at a bottom wall of the yoke portion is a smallest inner diameter of the inner circumferential surface of the resin-molded body.