Patent ID: 8994484
Filing Date: 2015-03-31
Classification: H01F

Abstract:
1. A linear solenoid comprising: a coil; a plunger that is made of a magnetic material, wherein the plunger is placed on a radially inner side of the coil and is movable in an axial direction; a yoke that is made of a magnetic material and is configured into a cup form, wherein the yoke includes an opening and a bottom wall portion and covers an outer peripheral portion of the coil; a stator core that includes: a stepped portion that is formed in an outer peripheral portion of the slide core and is stepped to reduce an outer diameter of one portion of the slide core located on one axial side of the stepped portion, which is axially opposite from the magnetically attracting core, in comparison to another portion of the slide core located on another axial side of the stepped portion where the magnetically attracting core is placed; and a ring core that is made of a magnetic material and includes: the second conducting portion conducts the magnetic flux between the second conducting portion and the bottom wall portion of the yoke in the axial direction; an outer diameter of the first conducting portion of the ring core is smaller than an inner diameter of the coil; and an axial extent of the coil overlaps with an axial extent of the first conducting portion of the ring core to place a portion of the coil on a radially outer side of the first conducting portion of the ring core.