Fuel delivery injector

Patent metadata

Field	Value
Publication number	US-11002234-B2
Application number	US-202016864025-A
Country	US
Kind code	B2
Filing date	Apr 30, 2020
Priority date	May 12, 2016
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

A fuel delivery injector includes a housing, an inlet port fluidly coupled to a cavity to direct fuel vapor and liquid fuel into the cavity, and an outlet port fluidly coupled to the cavity to direct fuel vapor and liquid fuel out of the cavity. A magnetic assembly is fixedly positioned within the cavity, and a pumping assembly includes a bobbin and a piston. A return spring is coupled to the pumping assembly to bias the pumping assembly to a home position. A valve is positioned within the piston and is movable between an open position and a closed position. The liquid fuel entering the housing through the inlet port flows from the inlet port to the cavity and fuel vapor entering the housing through the inlet port is directed through a conduit to the outlet port.

First claim

What is claimed is:

1. A fuel delivery injector, comprising:
a housing defining a cavity and including a sleeve having an outlet;
an inlet port fluidly coupled to the cavity to direct liquid fuel and fuel vapor into the cavity along an inlet port axis;
an outlet port offset from the inlet port and fluidly coupled to the cavity to divert liquid fuel and fuel vapor away from the inlet port axis and out of the cavity;
a magnetic assembly fixedly positioned within the cavity;
a pumping assembly including a bobbin and a piston;
the bobbin including a coil configured to be coupled to an electrical power supply, wherein the bobbin is configured to move the pumping assembly within the cavity in response to interaction between a magnetic field created by the coil and the magnetic assembly, wherein the piston is coupled to the bobbin and configured to move within the sleeve;

a return spring coupled to the pumping assembly to bias the pumping assembly to a home position; and
a valve positioned within the piston portion between an inlet chamber and an outlet chamber and configured to move between an open position in which liquid fuel may flow between the inlet chamber and the outlet chamber and a closed position in which liquid fuel is restricted from flowing between the inlet chamber and the outlet chamber.

2. The fuel delivery injector of claim 1 , further comprising an end cap coupled to the upper portion of the housing, wherein the end cap includes the inlet port and the outlet port.

3. The fuel delivery injector of claim 2 , wherein the end cap includes a protrusion extending therefrom and terminating at an end face, the protrusion configured to redirect fuel vapor away from the inlet port toward the outlet port.

4. The fuel delivery injector of claim 2 , wherein the end cap further includes an electrical connector configured to electrically couple the coil to the electrical power supply.

5. The fuel delivery injector of claim 1 , wherein the inlet port extends along an inlet port axis that is coaxial with a central longitudinal axis of the housing.

6. The fuel delivery injector of claim 1 , wherein the inlet port extends along an inlet port axis that is offset from a central longitudinal axis of the housing.

7. The fuel delivery injector of claim 6 , wherein the magnetic assembly is positioned offset from the piston.

8. The fuel delivery injector of claim 1 , further comprising a filter element positioned within the inlet port.

9. An internal combustion engine, comprising:
a cylinder having a cylinder head;
a piston positioned within the cylinder and configured to reciprocate within the cylinder relative to the cylinder head; and
a fuel delivery injector coupled to the cylinder head, comprising:
a housing defining a cavity and extending along a central longitudinal axis, wherein the housing includes an upper portion and a lower portion including a sleeve having an outlet;
an inlet port fluidly coupled to the cavity to direct liquid fuel and fuel vapor into the cavity;
an outlet port fluidly coupled to the cavity to direct liquid fuel and fuel vapor out of the cavity;
a magnetic assembly fixedly positioned within the cavity;
a pumping assembly including a bobbin and a piston;
the bobbin including a coil configured to be coupled to an electrical power supply, wherein the bobbin is configured to move the pumping assembly within the cavity in response to interaction between a magnetic field created by the coil and the magnetic assembly, wherein the piston is coupled to the bobbin and configured to move within the sleeve;

a return spring coupled to the pumping assembly to bias the pumping assembly to a home position; and

a valve positioned within a piston portion between an inlet chamber and an outlet chamber and configured to move between an open position in which liquid fuel may flow between the inlet chamber and the outlet chamber and a closed position in which liquid fuel is restricted from flowing between the inlet chamber and the outlet chamber;
wherein the inlet port is configured so that the liquid fuel entering the housing through the inlet port flows from the inlet port to the cavity and fuel vapor entering the housing through the inlet port is directed through a conduit to the outlet port.

10. The internal combustion engine of claim 9 , wherein the fuel delivery injector further comprises an end cap coupled to the upper portion of the housing, wherein the end cap includes the inlet port and the outlet port.

11. The internal combustion engine of claim 10 , wherein the end cap of the fuel delivery injector includes a protrusion extending therefrom and terminating at an end face, the protrusion configured to redirect fuel vapor away from the inlet port toward the outlet port.

12. The internal combustion engine of claim 10 , wherein the end cap of the fuel delivery injector further includes an electrical connector configured to electrically couple the coil to the electrical power supply.

13. The internal combustion engine of claim 9 , wherein the inlet port of the fuel delivery injector extends along an inlet port axis that is coaxial with the central longitudinal axis.

14. The internal combustion engine of claim 9 , wherein the inlet port of the fuel delivery injector extends along an inlet port axis that is offset from the central longitudinal axis.

15. The internal combustion engine of claim 14 , wherein the magnetic assembly of the fuel delivery injector is positioned offset from the piston.

16. The internal combustion engine of claim 9 , wherein the inlet port of the fuel delivery injector is positioned offset from the central longitudinal axis, between the central longitudinal axis and the outlet port.

17. The internal combustion engine of claim 9 , further comprising a filter element positioned within the fuel delivery injector.

18. An internal combustion engine, comprising:
a cylinder;
an intake manifold coupled to the cylinder;
a piston positioned within the cylinder and configured to reciprocate within the cylinder; and
a fuel delivery injector coupled to the intake manifold, comprising:
a housing defining a cavity, wherein the housing includes an upper portion and a lower portion including a sleeve having an outlet;
an inlet port fluidly coupled to the cavity and extending along an inlet port axis to direct liquid fuel and fuel vapor into the cavity;
an outlet port offset from the inlet port and fluidly coupled to the cavity to divert fuel vapor away from the inlet port axis and out of the cavity;
a magnetic assembly fixedly positioned within the cavity;
a pumping assembly including a bobbin and a piston;
the bobbin including a coil configured to be coupled to an electrical power supply, wherein the bobbin is configured to move the pumping assembly within the cavity in response to interaction between a magnetic field created by the coil and the magnetic assembly, wherein the piston is coupled to the bobbin and configured to move within the sleeve;

a return spring coupled to the pumping assembly to bias the pumping assembly to a home position; and
a valve positioned within a piston portion between an inlet chamber and an outlet chamber and configured to move between an open position in which liquid fuel may flow between the inlet chamber and the outlet chamber and a closed position in which liquid fuel is restricted from flowing between the inlet chamber and the outlet chamber.

19. The internal combustion engine of claim 18 , wherein the inlet port of the fuel delivery injector is position

Assignees

• Briggs & Stratton Llc

Inventors

• Pitcel Michael D
• Procknow David W
• Zuehl Jacob
• Kratz David A

Classifications

• F04B53/129

  Poppet valves · CPC title

• F04B49/065

  and making use of computers · CPC title

• F02M57/027

  electric · CPC title

• F02M37/08 Primary

  electrically driven · CPC title

• F04B17/046

  the fluid flowing through the moving part of the motor · CPC title