US 12,117,091 B2
Solenoid valve
Hiroyuki Iwanaga, Tokyo (JP); Yoshinari Kasagi, Tokyo (JP); and Kenta Furukawa, Tokyo (JP)
Assigned to EAGLE INDUSTRY CO., LTD., (JP)
Appl. No. 17/918,311
Filed by Eagle Industry Co., Ltd., Tokyo (JP)
PCT Filed Mar. 31, 2021, PCT No. PCT/JP2021/013996
§ 371(c)(1), (2) Date Oct. 11, 2022,
PCT Pub. No. WO2021/210405, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 2020-072401 (JP), filed on Apr. 14, 2020.
Prior Publication US 2023/0151903 A1, May 18, 2023
Int. Cl. F16K 31/06 (2006.01); F16K 47/00 (2006.01)
CPC F16K 31/06 (2013.01) [F16K 31/0613 (2013.01); F16K 31/0689 (2013.01); F16K 31/0693 (2013.01); F16K 47/0111 (2021.08); F16K 31/0606 (2013.01); F16K 2200/30 (2021.08)] 7 Claims
OG exemplary drawing
 
1. A solenoid valve comprising:
a valve unit including a sleeve in which a spool is accommodated so as to be movable in an axial direction; and
a solenoid unit including a plunger to be brought into contact with and separated from a stator by an electromagnetic force to drive the spool in the axial direction, a solenoid molded body disposed on an outer periphery of the plunger and of the stator, and a solenoid casing that accommodates the solenoid molded body,
wherein the plunger is disposed in an accommodation space of which at least a part is defined by the stator inside the solenoid unit, and
the solenoid valve further comprises a first breathing flow passage extending at least in a circumferential direction on the outer periphery of the stator to communicate with an outside of the solenoid valve,
a second breathing flow passage extending in the axial direction from part of the first breathing flow passage in the circumferential direction to communicate with a first space defined by the stator, the sleeve, and the spool,
a third breathing flow passage extending in the axial direction on an inner periphery of the stator to allow communication between the first space and the accommodation space,
wherein the first breathing flow passage is formed in an annular shape, and communicates with the outside of the solenoid valve through an axial communication passage extending in the axial direction toward an opening formed in the solenoid casing or in the sleeve, and
the axial communication passage is formed on a vertically lower side on the outer periphery of the stator in case the plunger is moved in a horizontal direction.