Injection valve

Patent metadata

Field	Value
Publication number	US-9541041-B2
Application number	US-201313960715-A
Country	US
Kind code	B2
Filing date	Aug 6, 2013
Priority date	Aug 15, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

An injection valve for injecting fuel into a combustion chamber of an internal combustion engine comprises a valve seat, a valve element, at least one injection opening formed in the valve seat and leading to the combustion chamber, the at least one injection opening opened or closed by a stroke motion of the valve element, a catalytic coating provided in a region of the injection valve which faces the combustion chamber, and at least one protuberance which is elongated in a direction of the combustion chamber and projects into the combustion chamber.

First claim

The invention claimed is:

1. An injection valve for injecting fuel into a combustion chamber of an internal combustion engine, comprising:
a valve seat protruding into the combustion chamber along a central longitudinal axis of the injection valve, the valve seat having a first protuberance and a second protuberance extending therefrom, the first protuberance distinct from and adjacent to the second protuberance of the valve seat;
a valve element;
a plurality of injection openings formed in the valve seat, arranged between the first and second protuberances in a radial direction, and leading to the combustion chamber, the injection openings opened or closed by a stroke motion of the valve element; and
a catalytic coating provided in a region of the injection valve which faces the combustion chamber; wherein
the first and second protuberances are elongated in a direction of the combustion chamber and project into the combustion chamber; and
the first protuberance is a single protuberance, being the only protuberance located radially interior to the plurality of injection openings, wherein the second protuberance comprises a plurality of protuberances arranged in a circle around the first protuberance projecting into the combustion chamber.

2. The injection valve as claimed in claim 1 , wherein in relation to a longitudinal axis of the injection valve, the protuberances have an axial extent which is at least 50% of an extent of said protuberances in a direction perpendicular to the longitudinal axis of the injection valve.

3. The injection valve as claimed in claim 1 , wherein the first protuberance is arranged radially on an inside in relation to a longitudinal axis of the injection valve, and the second protuberance is arranged radially on an outside in relation to the longitudinal axis of the injection valve.

4. The injection valve as claimed in claim 3 , wherein the first protuberance has a substantially conical geometry which tapers in the direction of the combustion chamber.

5. The injection valve as claimed in claim 3 , wherein the second protuberance is an encircling collar in relation to the longitudinal axis of the injection valve, the encircling collar being a single protuberance in a continuous annular shape.

6. The injection valve as claimed in claim 3 , wherein the plurality of injection openings is arranged obliquely to the longitudinal axis of the injection valve.

7. The injection valve as claimed in claim 1 , wherein the protuberances are formed on the valve seat, and wherein the second protuberance extends toward a cylinder a shorter distance than the first protuberance.

8. The injection valve as claimed in claim 1 , wherein the catalytic coating is formed on the first and second protuberances.

9. The injection valve as claimed in claim 1 , wherein the catalytic coating is formed around the plurality of injection openings, and the catalytic coating is formed only in regions which do not protrude.

10. The injection valve as claimed in claim 1 , wherein the valve element comprises a valve needle and a valve ball arranged at one end of the valve needle.

11. The injection valve as claimed in claim 1 , wherein in relation to a longitudinal axis of the injection valve, the second protuberance has an axial extent which is less than or equal to an extent of said protuberance in a direction perpendicular to the longitudinal axis of the injection valve.

12. A fuel injector, comprising:
a valve mechanism and a valve seat, the valve seat protruding out towards a combustion chamber in a region around a central longitudinal axis of the fuel injector;
a first protuberance extending out from the valve seat at the central longitudinal axis of the fuel injector, the first protuberance distinct from and abutting the protruding out of the valve seat;
a second protuberance extending out from the valve seat in a radial direction around the first protuberance;
a plurality of injector openings arranged between the first protuberance and the second protuberance in a radial direction; and
a catalytic coating formed on the first and second protuberances, the catalytic coating being composed of a material capable of catalytic conversion of adhered fuel and soot particles, wherein the second protuberance comprises a plurality of protuberances arranged in a circle around the first protuberance projecting into the combustion chamber.

13. The fuel injector of claim 12 , wherein the catalytic coating is formed around the plurality of injector openings, and the catalytic coating is additionally formed in regions of the valve seat which do not protrude.

14. The fuel injector of claim 12 , wherein the first protuberance has a length that is at least 50% of a width of the first protuberance, and wherein the second protuberance has a length that is at least 50% of a width of the second protuberance.

15. The fuel injector of claim 12 , wherein the plurality of injector openings is arranged obliquely to a longitudinal axis of the fuel injector.

16. The fuel injector of claim 12 , wherein the valve mechanism comprises a valve needle and a valve ball arranged at one end of the valve needle.

17. The fuel injector of claim 12 , wherein the valve seat is made of a first material and the first and second protuberances are made of a second material, the second material having a higher heat conductance than the first material.

18. A system, comprising:
an engine including a combustion chamber; and
a direct fuel injector for injecting fuel into the combustion chamber, the fuel injector comprising:
a valve mechanism and a valve mechanism seat, the valve mechanism seat extending out towards the combustion chamber in a region around a central longitudinal axis of the fuel injector;
a first protuberance extending out from the valve mechanism seat into the combustion chamber at the central longitudinal axis of the fuel injector, the first protuberance distinct from and contiguous to the extending out of the valve mechanism seat;
a second protuberance extending out from the valve mechanism seat into the combustion chamber in a radial direction around the first protuberance;
a plurality of injector openings formed in the valve mechanism seat and arranged between the first protuberance and the second protuberance in a radial direction; and
a catalytic coating formed on the first protuberance and the second protuberance, the catalytic coating being composed of a material capable of catalytic conversion of adhered fuel and soot particles, wherein the first protuberance has a length that is at least 50% of a width of the first protuberance, and wherein the second protuberance has a length that is at least 50% of a width of the second protuberance;
wherein the valve mechanism seat is made of a first material and the first and second protuberances are made of a second material, the second material having a higher heat conductance than the first material.

Assignees

• Ford Global Tech Llc

Inventors

• Grieser Klemens
• Berkemeier Oliver
• Wojahn Jens
• Linsel Jan
• Hohenboeken Kay

Classifications

• F02M27/02 Primary

  by catalysts · CPC title

• F02M63/0036

  with spherical or partly spherical shaped valve member ends · CPC title

• F02M2200/90

  Selection of particular materials · CPC title