Fuel injector having turbulence-reducing sac
AssigneeCaterpillar Inc.
InventorsBryan D. Moore, Sana Mahmood, Daniel R. Ibrahim
Life of this patent
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Abstract
A nozzle for a fuel injector is disclosed. The nozzle may have an internal axial nozzle bore. The nozzle may also have at least one orifice passing from the nozzle bore radially outward through a wall of the nozzle at a tip end. Further, the nozzle may have a sac volume formed in the tip end and defined by a bore radius and a tip radius. The bore radius may be generally perpendicular to the central bore. The tip radius may be generally parallel to the central bore. The tip radius may be less than the bore radius.
Claims20
A nozzle for a fuel injector, comprising:
- an axial nozzle bore located inside the nozzle;
- at least one orifice passing radially outward through a wall of the nozzle at a tip end;
- and
- a sac volume formed in the nozzle at the tip end, the sac volume being defined by a bore radius and a tip radius, wherein:
- the bore radius is generally perpendicular to the nozzle bore;
- the tip radius is generally parallel to the nozzle bore;
- and
- the tip radius is less than the bore radius.
A nozzle for a fuel injector, comprising:
- an axial nozzle bore located inside the nozzle;
- at least one orifice passing radially outward through a wall of the nozzle at a tip end;
- and
- a sac volume formed in the nozzle at the tip end, the sac volume having a generally elliptical cross-section.
A fuel injector, comprising:
- an injector body having a central bore;
- a needle valve element having a base end and a tip end, the needle valve element located in the central bore;
- a control chamber located at the base end of the needle valve element;
- and
- a nozzle connected to the injector body, the nozzle having:
- an axial nozzle bore configured to slidingly receive the needle valve element;
- at least one orifice passing radially outward through a wall of the nozzle at a tip end;
- a sac volume formed in the nozzle at the tip end and having a generally elliptical cross-section, the sac volume being defined by a bore radius and a tip radius, wherein:
- the bore radius is generally perpendicular to the central bore;
- the tip radius is generally parallel to the central bore;
- the tip radius is less than the bore radius;
- and
- an angle formed between an interior sac wall at a downstream entrance to the at least one orifice and an annular wall of the orifice is approximately 105 degrees.
Dependencies are inferred from the claim text.