Fuel injection device

Patent metadata

Field	Value
Publication number	US-10151285-B2
Application number	US-201615523974-A
Country	US
Kind code	B2
Filing date	Feb 16, 2016
Priority date	Mar 9, 2015
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A fuel injection device injecting a fuel from an injection hole to a combustion chamber of an internal combustion engine includes a valve body including a fuel passage through which the fuel flows to the injection hole and a seat portion facing the fuel passage, a valve member moving in the valve body in an axial direction of the valve body and opening and closing the injection hole by being removed from and seated on the seat portion, a dividing member defining a pressure control chamber placed at a position opposite to the injection hole with respect to the valve member, and an outer peripheral member surrounding an exterior of an outer periphery of the dividing member. The pressure control chamber controls a movement of the valve member by a pressure of the fuel that is introduced. The outer peripheral member and the valve body constitute the fuel passage.

First claim

The invention claimed is:

1. A fuel injection device injecting a fuel that is supplied from an injection hole to a combustion chamber of an internal combustion engine, the fuel injection device comprising:
a valve body including
a fuel passage through which the fuel flows to the injection hole, and
a seat portion facing the fuel passage;

a valve member moving in the valve body in an axial direction of the valve body, the valve member opening and closing the injection hole by being removed from and seated on the seat portion;
a dividing member defining a pressure control chamber placed at a position opposite to the injection hole with respect to the valve member, the pressure control chamber controlling a movement of the valve member by a pressure of the fuel that is introduced; and
an outer peripheral member surrounding an exterior of an outer periphery of the dividing member, the outer peripheral member and the valve body constituting the fuel passage, wherein:
the outer peripheral member includes a collecting passage placed at a position outward of the fuel passage, and the collecting passage collects the fuel leaked from the fuel passage between the outer peripheral member and the valve body; and
the collecting passage is a cylindrical hole that extends in an axial direction of the outer peripheral member.

2. The fuel injection device according to claim 1 , wherein
the outer peripheral member includes an outer peripheral wall that is a cylindrical shape and surrounds an exterior of the fuel passage, and
the outer peripheral member has a length in the axial direction that is shorter than an outer diameter of the outer peripheral member.

3. The fuel injection device according to claim 2 , wherein
the valve body includes the fuel passage that is a cylindrically-hollowed shape and receives the valve member, and
the outer peripheral wall has an inner diameter that is the same as an inner diameter of the valve body.

4. The fuel injection device according to claim 2 , wherein
the outer peripheral wall has a wall thickness that is the same as a wall thickness of a peripheral wall portion surrounding the fuel passage in the valve body.

5. The fuel injection device according to claim 1 , wherein
the valve member moves in a direction that the valve member is separated from the seat portion by a distance less than or equal to a maximum stroke that is previously established, and starts an injection of the fuel injected from the injection hole, and
the dividing member includes a limiting portion limiting the movement of the valve member from the valve member exceeding the maximum stroke.

6. The fuel injection device according to claim 1 , further comprising:
an orifice member placed at a position opposite to the valve body with respect to the outer peripheral member, the orifice member including an inflow inlet through which the fuel flows to the pressure control chamber; and
a pressing member arranged in the pressure control chamber, the pressing member preventing an entering of the fuel from the inflow inlet to the pressure control chamber while being pressed to the orifice member by the pressure of the fuel in the pressure control chamber.

7. The fuel injection device according to claim 1 , wherein
the dividing member is selected to be one of plural members that are different in length along a moving direction that the valve body moves.

8. The fuel injection device according to claim 7 , wherein
the outer peripheral member is selected to be one of the members that are different in length along the moving direction, and
the outer peripheral member has the length corresponding to the length of the dividing member.

Assignees

• Denso Corp

Inventors

• Seki Kazuho

Classifications

• F02M55/008

  Arrangement of fuel passages inside of injectors · CPC title

• F02M47/027 Primary

  Electrically actuated valves draining the chamber to release the closing pressure · CPC title

• F02M47/00

  Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure (fuel- injectors actuated by the pressure in engine working cylinders F02M49/00) · CPC title

• F02M61/04

  having valves {, e.g. having a plurality of valves in series} · CPC title

• F02M55/007

  Venting means · CPC title