Patent ID: 8154370

Claim:
A linear solenoid comprising: a coil to generate a magnetic force by being supplied with electricity; a plunger supported to slide in an axis direction; and a stator core integrally having a first magnetic core to attract the plunger using the magnetic force generated by the coil, a second magnetic core to transmit magnetism with the plunger in a radial direction, and a first blocker arranged between the first magnetic core and the second magnetic core, the first blocker restricting the first magnetic core and the second magnetic core from directly having magnetic combining with each other, wherein the plunger directly slides on an inner circumference face of the stator core, the second magnetic core has a second blocker distanced from the first blocker in the axis direction, the second blocker restricts the second magnetic core from forming a magnetic path, each of the first blocker and the second blocker is defined by forming an annular slot on an outer circumference face of the stator core, the plunger has a magnetic base and a nonmagnetic plating layer defined on a surface of the magnetic base, the nonmagnetic plating layer directly slides on the inner circumference face of the stator core, the magnetic base has a first projection projected in the radial direction and located in a range of the first blocker relative to entire stroke range of the plunger in the axis direction, a second projection projected in the radial direction and located in a range of the second blocker relative to entire stroke range of the plunger in the axis direction, and a plunger main tube located between the first projection and the second projection in the axis direction, the plunger main tube transmitting magnetism with the second magnetic core in the radial direction, the plating layer is arranged on at least outer faces of the first and second projections, the plating layer of the first projection slides on an inner circumference face of the first blocker at a first sliding section, the plating layer of the second projection slides on an inner circumference face of the second blocker at a second sliding section, and the plunger directly slides on the inner circumference face of the stator core only at the first sliding section and the second sliding section.