US 12,065,995 B2
Fuel injection device
Takatoshi Iizuka, Hitachinaka (JP); Takao Miyake, Hitachinaka (JP); and Masashi Sugaya, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd, Hitachinaka (JP)
Appl. No. 18/281,013
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Feb. 2, 2022, PCT No. PCT/JP2022/004025
§ 371(c)(1), (2) Date Sep. 8, 2023,
PCT Pub. No. WO2022/239329, PCT Pub. Date Nov. 17, 2022.
Claims priority of application No. 2021-080913 (JP), filed on May 12, 2021.
Prior Publication US 2024/0151199 A1, May 9, 2024
Int. Cl. F02M 61/12 (2006.01); F02M 45/08 (2006.01); F02M 61/18 (2006.01)
CPC F02M 61/12 (2013.01) [F02M 45/08 (2013.01); F02M 45/083 (2013.01); F02M 61/1806 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A fuel injection device, comprising:
a nozzle holder where an injection hole-forming member is provided;
a fixed core disposed in the nozzle holder;
an anchor disposed opposite the fixed core; and
a valve member movably disposed in the nozzle holder,
wherein
the valve member includes:
a plunger rod provided with a shaft portion that opens and closes an injection hole provided in the injection hole-forming member, and an engaging portion that engages with the anchor during a valve opening operation, and
a spacer having an accommodating portion in which the engaging portion is accommodated and forming a predetermined gap between the engaging portion and the anchor when the valve is closed,
an upper shaft portion having a smaller diameter than a diameter of the engaging portion is provided on a rear end portion side of the plunger rod in the axial direction with respect to the engaging portion of the plunger rod,
the spacer includes:
a small-diameter portion in which is formed a small-diameter hole into which the upper shaft portion provided to the plunger rod is inserted,
a large-diameter portion where the accommodating portion is formed and which is formed larger than the diameter of the small-diameter portion, and
a stepped surface connecting the small-diameter portion and the large-diameter portion,
a gap between the accommodating portion and the engaging portion is formed larger than a gap between the small-diameter portion and the upper shaft portion, and
the accommodating portion and the engaging portion are in line contact or point contact.