Precombustion chamber gas engine

Patent metadata

Field	Value
Publication number	US-11300039-B2
Application number	US-201816649864-A
Country	US
Kind code	B2
Filing date	Aug 28, 2018
Priority date	Sep 29, 2017
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

A precombustion chamber gas engine includes a main-chamber forming portion forming a main combustion chamber, and a precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via a plurality of nozzle holes. The precombustion-chamber forming portion includes a cylindrical portion extending along an extension direction of a precombustion chamber central axis of the precombustion-chamber forming portion, and a tip portion closing a main-combustion-chamber-side end of the cylindrical portion and having the nozzle holes. The tip portion includes a thin region having a thickness T satisfying T<L where L is a length of each nozzle hole.

First claim

The invention claimed is:

1. A precombustion chamber gas engine comprising:
a main-chamber forming portion forming a main combustion chamber; and
a precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via a plurality of nozzle holes,
wherein the precombustion-chamber forming portion includes a cylindrical portion extending along an extension direction of a precombustion chamber central axis of the precombustion-chamber forming portion, and a tip portion closing a main-combustion-chamber-side end of the cylindrical portion and having the nozzle holes,
wherein the tip portion includes a thin region having a thickness T satisfying T<L where L is a length of each nozzle hole, and
wherein the thin region includes a recess formed in a region including a portion of the tip portion between a pair of nozzle holes adjacent each other in a circumferential direction of the tip portion.

2. A precombustion chamber gas engine comprising:
a main-chamber forming portion forming a main combustion chamber; and
a precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via a plurality of nozzle holes,
wherein the precombustion-chamber forming portion includes a cylindrical portion extending along an extension direction of a precombustion chamber central axis of the precombustion-chamber forming portion, and a tip portion closing a main-combustion-chamber-side end of the cylindrical portion and having the nozzle holes,
wherein the tip portion is located on a main combustion chamber side of a reference plane that extends in a direction perpendicular to the precombustion chamber central axis at a position away from an upper edge of a precombustion-chamber-side opening of each nozzle hole by a length predetermined times a diameter of each nozzle hole in a direction opposite to the main combustion chamber along the extension direction of the precombustion chamber central axis,
wherein the tip portion includes a thin region having a thickness T satisfying T<T 0 where T 0 is a thickness of the precombustion-chamber forming portion at the reference plane, and
wherein the thin region includes a recess formed in a region including a portion of the tip portion between a pair of nozzle holes adjacent each other in a circumferential direction of the tip portion.

3. The precombustion chamber gas engine according to claim 1 ,
wherein the thin region includes a tip of the tip portion.

4. The precombustion chamber gas engine according to claim 2 ,
wherein the thin region includes a tip of the tip portion.

5. The precombustion chamber gas engine according to claim 2 ,
wherein the thin region includes at least a part of a peripheral edge of a main-combustion-side opening of each nozzle hole in the tip portion.

6. The precombustion chamber gas engine according to claim 1 ,
wherein the thin region includes at least one outer recess formed in an outer peripheral surface of the tip portion facing the main combustion chamber.

7. The precombustion chamber gas engine according to claim 1 ,
wherein the thin region includes at least one inner recess formed in an inner peripheral surface of the tip portion facing the precombustion chamber.

8. The precombustion chamber gas engine according to claim 2 ,
wherein the thin region includes at least one outer recess formed in an outer peripheral surface of the tip portion facing the main combustion chamber.

9. The precombustion chamber gas engine according to claim 2 ,
wherein the thin region includes at least one inner recess formed in an inner peripheral surface of the tip portion facing the precombustion chamber.

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Kashiwagi Masahiro
• Watanabe Daigo
• Furukawa Yuta

Classifications

• F02B19/1014

  design parameters, e.g. volume, torch passage cross sectional area, length, orientation, or the like · CPC title

• F02B19/18 Primary

  Transfer passages between chamber and cylinder · CPC title

• F02B43/00

  Engines characterised by operating on gaseous fuels; Plants including such engines (engines characterised by the gas-air charge being ignited by compression ignition of an additional fuel F02B7/06; engines convertible from gas to other fuel consumption F02B69/04) · CPC title

• F02M21/0281

  Adapters, sockets or the like to mount injection valves onto engines; Fuel guiding passages between injectors and the air intake system or the combustion chamber · CPC title

• F02B19/12

  with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08) · CPC title