Patent ID: 7487798
Filing Date: 2009-02-10
Classification: F16K,Y10T

Abstract:
1. A linear solenoid valve for generating an electromagnetic force in proportion to an amount of current supplied to a solenoid and displacing a valve element under the generated electromagnetic force, comprising: a valve casing including a valve body having an inlet port and an outlet port for passage of a fluid under pressure therethrough, and a housing joined to said valve body; a solenoid mounted in said housing and having a coil wound around a coil bobbin, a fixed core, a movable core that is attracted to said fixed core when said coil is energized, and a tubular yoke surrounding said movable core; a valve mechanism mounted in said valve body and having a valve element responsive to displacement of said movable core, for selectively bringing said inlet port and said outlet port into and out of fluid communication with each other, wherein said housing includes a bottom having a protruding support extending a predetermined distance toward said movable core, and said movable core has an annular boss extending a predetermined distance toward the bottom of said housing, wherein a circumferential surface of said annular boss of said movable core and a wall surface of the bottom of said housing are positioned in partially overlapping relation to each other, wherein said annular boss is disposed in an annular space defined by said tubular yoke, the bottom of said housing and said protruding support of said housing, wherein the annular space extends past an end surface of the coil bobbin adjacent to the wall surface of the bottom of the housing, wherein the annular boss of the moveable core is moveable within the annular space and past the end surface of the coil bobbin adjacent to the wall surface of the bottom of the housing, and wherein said movable core comprises a shaft that extends axially through said movable core and displaces in unison with said movable core, an end of said shaft protruding from said movable core by a predetermined length toward the bottom of said housing inside said annular boss, said end being inserted in a hole defined in said protruding support.