US 11,982,253 B2
Fuel injector
Guy Hoffmann, Luxembourg (LU); and Cas Breedijk, Kanfen (FR)
Assigned to PHINIA Delphi Luxembourg SARL, Belvaux (LU)
Appl. No. 17/265,052
Filed by DELPHI AUTOMOTIVE SYSTEMS LUXEMBOURG S.A., Bascharage (LU)
PCT Filed Jul. 19, 2019, PCT No. PCT/EP2019/069466
§ 371(c)(1), (2) Date Feb. 1, 2021,
PCT Pub. No. WO2020/025354, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 1812530 (GB), filed on Aug. 1, 2018.
Prior Publication US 2021/0310455 A1, Oct. 7, 2021
Int. Cl. F02M 61/18 (2006.01); F02M 51/06 (2006.01); F02M 61/20 (2006.01)
CPC F02M 61/18 (2013.01) [F02M 51/0671 (2013.01); F02M 61/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fuel injector comprising:
a housing extending axially along an injector axis from a proximal end to a distal end and having a nozzle at the distal end, said nozzle ending by a nozzle tip from which fuel is sprayed;
a pintle having a pintle shaft which extends axially and also having an annular collar which projects radially from the pintle shaft, said annular collar having a collar surface, the pintle being axially movable between an open position and a closed position, thereby controlling flow of fuel at said nozzle tip; and
an armature that is axially guided in the housing between a proximal position and a distal position, the armature having an axial through-hole therein in which the pintle shaft is guided and an armature surface which engages the collar surface, thereby transferring an axial force which moves the pintle into the open position when the armature moves to the proximal position;
the armature further including a plurality of fuel channels that are disposed radially outside with respect to the through-hole;
wherein a first resilient member is provided which biases the pintle toward the distal end;
wherein a second resilient member is provided which biases the armature toward the distal end;
wherein the armature surface and the collar surface are slanted with respect to the injector axis; and
wherein the collar surface and the armature surface that engages the collar surface are both convex curved such that the collar surface has an arcuate protrusion that arcuately protrudes outwardly, the armature surface has an arcuate protrusion that arcuately protrudes outwardly, wherein the arcuate protrusion of the collar surface and the arcuate protrusion of the armature surface are spherical such that each corresponds to a portion of a surface of a sphere, wherein the arcuate protrusion of the armature surface extends from the through-hole to the fuel channels, and wherein the arcuate protrusion of the armature surface and the arcuate protrusion of the collar surface engage one another.