Gas injector for the direct injection of gaseous fuel into a combustion chamber

Patent metadata

Field	Value
Publication number	US-9683519-B2
Application number	US-201514599112-A
Country	US
Kind code	B2
Filing date	Jan 16, 2015
Priority date	Jan 17, 2014
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A gas injector for the direct injection of gaseous fuel into a combustion chamber of an internal combustion engine, which includes a valve seat, a valve needle having a sealing region, the valve needle releasing a first cross-sectional area at the valve seat in response to a lift, a component surrounding the valve needle, and a gas control region, which is situated directly next to the sealing region, the gas control region providing a constant cross-sectional area between the valve needle and the component surrounding the valve needle across a lift length from a first lift position to a second lift position.

First claim

What is claimed is:

1. A gas injector for directly injecting gaseous fuel into a combustion chamber of an internal combustion engine, comprising:
a valve seat;
a valve needle having a sealing region, the valve needle releasing a first cross-sectional area at the valve seat in response to a lift;
a component surrounding the valve needle; and
a gas control region, which is situated at the valve needle directly next to the sealing region;
wherein the gas control region provides a constant cross-sectional area between the valve needle and the component surrounding the valve needle across a lift length from a first lift position to a second lift position, wherein the valve needle provides a second cross-sectional area that is larger than the constant cross-sectional area at a lift length greater than the second lift position.

2. The injector of claim 1 , wherein the gas control region is cylindrical.

3. The injector of claim 2 , wherein the gas control region has at least one flattened region at the outer periphery.

4. The injector of claim 2 , wherein the gas control region has multiple recesses running in the axial direction.

5. The injector of claim 1 , wherein the gas control region has multiple through openings running in the axial direction.

6. The injector of claim 1 , wherein the component surrounding the valve needle has an inner cylinder region and the cross-sectional area is an annular gap.

7. The injector of claim 1 , wherein the lift length from the first lift position to the second lift position amounts to maximally one third of an overall lift, wherein the overall lift is between a starting position when the valve needle is engaged with the valve seat and an end position that represents a position along an axis of the injector of maximal displacement of the valve needle from the valve seat .

8. The injector of claim 1 , wherein the valve needle at the gas control region includes a guide region.

9. The injector of claim 2 , wherein the gas control region has multiple flattened regions at the outer periphery.

10. A gas-operated internal combustion engine, comprising:
a gas injector for directly injecting gaseous fuel into a combustion chamber, including:
a valve seat;
a valve needle having a sealing region, the valve needle releasing a first cross-sectional area at the valve seat in response to a lift;
a component surrounding the valve needle; and
a gas control region, which is situated at the valve needle directly next to the sealing region;
wherein the gas control region provides a constant cross-sectional area between the valve needle and the component surrounding the valve needle across a lift length from a first lift position to a second lift position, and wherein the valve needle provides a second cross-sectional area that is larger than the constant cross-sectional area at a lift length greater than the second lift position.

11. The injector of claim 1 , wherein a radius of the gas control region is larger than a radius of a region of the valve needle above the gas control region.

12. The gas-operated internal combustion engine of claim 10 , wherein a radius of the gas control region is larger than a radius of a region of the valve needle above the gas control region.

Assignees

• Bosch Gmbh Robert

Inventors

• Jaegle Felix
• Ohlhafer Olaf
• Schoefer Joerg
• Giezendanner-Thoben Robert

Classifications

• Y02T10/30

  Use of alternative fuels, e.g. biofuels · CPC title

• F02M21/0269

  Outwardly opening valves, e.g. poppet valves · CPC title

• Y02T10/32

  Cross-Sectional Technologies · mapped topic

• F02M21/0275 Primary

  for in-cylinder direct injection, e.g. injector combined with spark plug · CPC title

• F02M45/08

  Injectors peculiar thereto · CPC title