Granted Patent B2

US 7,137,577 · App. 10/982,647 · Granted Nov 21, 2006

Abstract

Claims (18)

1. A nozzle for a low pressure fuel injector, the fuel injector delivering fuel to a cylinder of an engine, the nozzle comprising:

a nozzle body defining a valve outlet and a longitudinal axis;

a metering plate connected to the nozzle body and in fluid communication with the valve outlet;

the metering plate defining a nozzle cavity receiving fuel from the valve outlet through an entrance orifice, the nozzle cavity defined by a bottom wall and a side wall;

the metering plate defining a plurality of exit cavities receiving fuel from the nozzle cavity, each exit cavity radially spaced from the longitudinal axis and oriented along a radial axis, each exit cavity meeting the nozzle cavity at an exit orifice; and

each exit orifice including an annular wall extending around the exit orifice and projecting up from the bottom wall into the nozzle cavity.

2. The nozzle of claim 1 , further comprising another annular wall extending around the entrance orifice and projecting into the nozzle cavity.

3. The nozzle of claim 1 , wherein the annular wall follows a zig-zag line around the exit orifice.

4. The nozzle of claim 1 , wherein the annular wall includes vertical serrations.

5. The nozzle of claim 1 , wherein the bottom wall in the area adjacent each exit orifice includes a plurality of linear grooves.

6. The nozzle of claim 5 , wherein the grooves extend in a direction non-aligned with the radial axis of the adjacent orifice.

7. The nozzle of claim 5 , wherein the grooved area of the bottom wall extends completely up to the exit orifice.

8. The nozzle of claim 1 , wherein the annular wall is intermittent.

9. The nozzle of claim 1 , wherein the annular wall is continuous.

10. The nozzle of claim 5 , wherein the grooves extend in a direction perpendicular to the radial axis of the adjacent orifice.

11. The nozzle of claim 5 , wherein the grooved area is square or rectangular in shape.

12. The nozzle of claim 1 , wherein the bottom wall in the area adjacent each exit orifice includes a plurality of annular grooves.

13. The nozzle of claim 12 , wherein the grooved area leaves a flat area adjacent the exit orifice.

Assignments (17)