Variable hole size nozzle and spray angle fuel injector and MHBIB

Patent metadata

Field	Value
Publication number	US-9957939-B2
Application number	US-201515514988-A
Country	US
Kind code	B2
Filing date	Oct 1, 2015
Priority date	Oct 2, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A fuel injector, comprising a nozzle body having a proximal end and a distal end, an upper row of nozzle holes being equally spaced about a first circumference of the nozzle body, and a lower row of nozzle holes located between the distal end and the upper row of nozzle holes, wherein the upper row has a first number of holes that is greater than a second number of holes in the lower row and wherein one of the first number of holes and the second number of holes is odd.

First claim

The invention claimed is:

1. A fuel injector, comprising:
a nozzle body having a proximal end and a distal end;
an upper row of nozzle holes at least a plurality of which being equally spaced about a first circumference of the nozzle body, and the nozzle holes of the upper row have one or more diameters; and
a lower row of nozzle holes located between the distal end and the upper row of nozzle holes, and each of the nozzle holes in the lower row has a diameter less than the one or more diameters of the nozzle holes of the upper row;
wherein the upper row has a first number of holes that is greater than a second number of holes in the lower row; and
wherein one of the first number of holes and the second number of holes is odd.

2. The fuel injector of claim 1 , wherein the nozzle holes of the upper row each have a first diameter and the nozzle holes of the lower row each have a second diameter, the first diameter has a ratio to the second diameter in the range of 3.2:1 to 1.5:1.

3. The fuel injector of claim 1 , wherein the nozzle holes of the upper row each have a first angle relative to a horizontal axis of the nozzle body and the nozzle holes of the lower row each have a second angle relative to the horizontal axis, the first angle having a ratio to the second angle in the range of 0.5:1 to 1.5:1.

4. The fuel injector of claim 1 , wherein the nozzle holes of the upper row are configured to provide a plume of fuel that corresponds to a shape of a piston bowl.

5. The fuel injector of claim 1 , further including a nozzle hole at a bottom center of the nozzle body with a third diameter equal to one of the first diameter or the second diameter.

6. The fuel injector of claim 1 , wherein each nozzle hole includes an inlet having an inlet diameter, an outlet having an outlet diameter, and a passage extending between the inlet and the outlet through the nozzle body, the inlet diameter being different from the outlet diameter.

7. A method, comprising;
injecting a plume of fuel into a combustion chamber toward an outer bowl of a piston; and
impinging the plume of fuel onto an inlet lip formed between the outer bowl and an inner bowl of the piston;
wherein the inlet lip redirects the fuel upon impact to provide turbulence and additional fuel-air mixing in a central region of the piston; and
wherein the outer piston bowl is configured to redirect injected fuel radially inward and upwards towards a piston crown.

8. A method, comprising;
operating a fuel injector in response to a low engine load condition such that a first fuel injection event occurs in which the fuel is injected into a combustion chamber from a nozzle of the injector having a plurality of holes arranged in a lower row and an upper row, the first fuel injection event injecting at least a portion of fuel from the lower row; and
operating the fuel injector in response to a high engine load condition such that a second fuel injection event occurs in which fuel is injected from the lower row and from the upper row;
wherein the fuel injected in the first fuel injection event maintains a predetermined air-fuel ratio in a central region of a piston; and
wherein operating the fuel injector in response to a low engine load condition includes directing the fuel through the lower row at a first angle relative to a plane containing a top surface of the piston, and operating the fuel injector in response to a high engine load condition includes directing the fuel through the upper row at a second angle relative to the plane, the first angle being larger than the second angle.

Assignees

• Cummins Inc

Inventors

• Mahato Chandan
• Husmeier Frank
• Henderson Foy C

Classifications

• F02M61/1826

  Discharge orifices having different sizes · CPC title

• F02M61/1806 Primary

  characterised by the arrangement of discharge orifices, e.g. orientation or size · CPC title

• F02M61/1813

  Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other · CPC title

• F02M61/1846

  Dimensional characteristics of discharge orifices · CPC title

• F02M61/1833

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