公开(公告)号：US11215293B2

公开(公告)日：2022-01-04

申请号：US16648763

申请日：2018-09-21

Applicant: ADVICS CO., LTD.

Inventor： Junichi Fukuda ,  Koichi Hashida ,  Hidenori Hayakawa

IPC: F16K31/06 ,  F04B53/10 ,  H01F7/13 ,  H01F7/08 ,  H01F7/16

Abstract: A yoke is provided with a notch, notched from two points P1 and P2 on a circumference forming a sleeve-side insertion hole toward the outside of the circumference, the notch having a minimum distance between the points P1 and P2 as a width W and the distance from a straight line linking the points P1 and P2 in a direction orthogonal to the straight line as a length L. The width W of the notch is set on the basis of a target attraction force for attracting a plunger, the attraction force increasing with an increase in the width W, and the length L of the notch is greater than or equal to a prescribed length Ld where the attraction force increasing with an increase in the length L becomes constant at the target attraction force in the set width W irrespective of an increase in the length L.