US 11,948,737 B2
Solenoid
Kazuhiro Sasao, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Dec. 30, 2021, as Appl. No. 17/566,230.
Application 17/566,230 is a continuation of application No. PCT/JP2020/026647, filed on Jul. 8, 2020.
Claims priority of application No. 2019-132578 (JP), filed on Jul. 18, 2019.
Prior Publication US 2022/0122754 A1, Apr. 21, 2022
Int. Cl. H01F 7/16 (2006.01); H01F 7/08 (2006.01); F16K 31/06 (2006.01)
CPC H01F 7/1607 (2013.01) [H01F 7/081 (2013.01); F16K 31/0675 (2013.01); H01F 2007/086 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A solenoid, comprising:
a coil portion configured to generate a magnetic force when energized;
a yoke including a side surface portion along an axial direction and a bottom portion formed along a direction intersecting the axial direction, and being configured to accommodate the coil portion;
a columnar plunger that slides in the axial direction;
a stator core including
a magnetic attraction core arranged in the axial direction to face a distal end surface of the plunger and configured to attract magnetically the plunger by a magnetic force generated by the coil portion,
a sliding core having a tubular core portion arranged inside the coil portion in a radial direction orthogonal to the axial direction and accommodating the plunger, and a first magnetic flux transfer portion formed from a core end portion which is an axial end portion of the core portion and faces the bottom portion toward an outside in the radial direction so as to transfer magnetic flux between the yoke and the core portion, and
a magnetic flux passage suppressing portion configured to suppress passage of magnetic flux between the sliding core and the magnetic attraction core; and
a second magnetic flux transfer portion that is disposed radially outside a magnetic attraction core end, which is an end in the axial direction of the magnetic attraction core and is opposite to a side facing the distal end surface, and is configured to transfer the magnetic flux between the magnetic attraction core and the side surface portion,
wherein
a first facing surface faces the bottom portion in the first magnetic flux transfer portion, and
a breathing groove communicating an inside and an outside of the first magnetic flux transfer portion in the radial direction is formed on a second facing surface facing the first magnetic flux transfer portion at the bottom portion so as to be positioned in a vertical direction when the solenoid is assembled.