Vehicular high pressure direct injection type injector with valve seat body for fuel-atomization

Patent metadata

Field	Value
Publication number	US-9664160-B2
Application number	US-201314416230-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Dec 20, 2012
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

Disclosed herein is a vehicular high pressure direct injection type injector with valve seat body for fuel-atomization. A nozzle hole has an elliptical cross-section so that the fuel injection speed can be increased, whereby a fuel atomization effect can be maximized. Furthermore, a stepped hole is formed under the nozzle hole so that the nozzle hole can be fundamentally prevented from becoming clogged with combustion byproducts.

First claim

The invention claimed is:

1. A vehicular high pressure direct injection type injector with valve seat body for fuel-atomization, the injector comprising:
a cylindrical housing having a needle valve therein;
a magnetic coil arranged for reciprocating the needle valve;
a current supply line arranged for supplying current to the magnetic coil;
a return spring disposed at an upper end of the needle valve, the return spring arranged for applying a restoring force to the needle valve;
a valve seat body disposed at a lower end of the cylindrical housing; and
a ball disposed between the valve seat body and the needle valve,
wherein the valve seat body includes:
a valve seat surface structured to accommodate the ball in a seated position,
a nozzle hole located under the valve seat surface in a direction in which fuel is injected, and
a stepped hole formed under the nozzle hole in the direction in which fuel is injected, the stepped hole having a horizontal cross-sectional area that is greater than a largest horizontal cross-sectional area of the nozzle hole, each of the horizontal cross-sectional areas being in a plane perpendicular to the direction in which fuel is injected,

wherein a horizontal cross-section of the nozzle hole is shaped as an ellipse having a minor axis to a major axis ratio in a range of greater than 1:1 up to 1:3.5, and
wherein the nozzle hole has a reverse truncated conical shape with a side surface that is tapered in the direction in which fuel is injected, such that the horizontal cross-sectional area of the nozzle hole decreases in the direction in which fuel is injected.

2. The vehicular high pressure direct injection type injector with valve seat body for fuel-atomization as set forth in claim 1 , wherein the valve seat body includes a plurality of the nozzle holes.

Assignees

• Hyundai Kefico Corp

Inventors

• Park Jeong-Hwan
• Kim Hyoung-Jin

Classifications

• F02M51/0671 Primary

  the armature having an elongated valve body attached thereto · CPC title

• F02M61/1833

  Discharge orifices having changing cross sections, e.g. being divergent · CPC title

• F02M61/184

  Discharge orifices having non circular sections · CPC title

• F02M51/061 Primary

  using electromagnetic operating means · CPC title

• F02M51/06 Primary

  Injectors peculiar thereto {with means directly operating the valve needle} · CPC title