Precombustion chamber gas engine

Patent metadata

Field	Value
Publication number	US-11566559-B2
Application number	US-202117472040-A
Country	US
Kind code	B2
Filing date	Sep 10, 2021
Priority date	Dec 8, 2016
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A precombustion chamber gas engine includes a main-chamber forming portion forming a main combustion chamber, a precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via a plurality of nozzle holes, and an ignition device disposed in the precombustion chamber and having an ignition portion spaced from a main chamber central axis of the main combustion chamber at a predetermined distance. In a plan view, the precombustion chamber has a near-ignition region including the ignition portion and a far-ignition region opposite to the near-ignition region separated by a borderline passing through a precombustion chamber central axis of the precombustion chamber and perpendicular to a straight line passing through the precombustion chamber central axis and the ignition portion. The distance between the precombustion chamber central axis and a precombustion-chamber-side opening end, connected to the precombustion chamber, of a specific far nozzle hole which is at least one nozzle hole in the far-ignition region is shorter or longer than the distance between the precombustion chamber central axis and a precombustion-chamber-side opening end of a specific near nozzle hole which is at least one nozzle hole in the near-ignition region.

First claim

The invention claimed is:

1. A precombustion chamber gas engine comprising:
a main-chamber forming portion forming a main combustion chamber;
precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via a plurality of nozzle holes; and
an ignition device disposed at an upper portion of an interior of the precombustion chamber and having an ignition portion spaced from a main chamber central axis of the main combustion chamber at a predetermined distance,
wherein, in a plan view, the precombustion chamber has a near-ignition region in which the ignition portion is disposed and a far-ignition region opposite to the near-ignition region, the near-ignition region and the far-ignition region being separated by a borderline passing through a precombustion chamber central axis of the precombustion chamber and perpendicular to a straight line passing through the precombustion chamber central axis and the ignition portion,
wherein the plurality of nozzle holes includes a specific far nozzle hole which is at least one nozzle hole in the far-ignition region and a specific near nozzle hole which is at least one nozzle hole in the near-ignition region, and a nozzle hole length of the specific far nozzle hole is shorter than a nozzle hole length of the specific near nozzle hole, and
wherein the precombustion chamber is formed so as to deviate the precombustion chamber central axis from the main chamber central axis so that a distance between the main chamber central axis and a precombustion-chamber-side opening end of the specific far nozzle hole is longer than a distance between the main chamber central axis and a precombustion-chamber-side opening end of the specific near nozzle hole in the precombustion-chamber forming portion.

2. The precombustion chamber gas engine according to claim 1 ,
wherein the specific near nozzle hole includes a nearest nozzle hole closest to the ignition portion among the plurality of nozzle holes in the near-ignition region in a plan view, and
wherein the specific far nozzle hole includes a farthest nozzle hole farthest from the ignition portion among the plurality of nozzle holes in the far-ignition region in a plan view.

3. The precombustion chamber gas engine according to claim 1 ,
wherein the precombustion chamber is formed so as to deviate the precombustion chamber central axis from the main chamber central axis so that a distance between the main chamber central axis and a precombustion-chamber-side opening end of the specific far nozzle hole is longer than a distance between the main chamber central axis and a precombustion-chamber-side opening end of the specific near nozzle hole in the precombustion-chamber forming portion.

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Nomura Kazutoshi
• Takemoto Daisuke
• Yamada Satoshi
• Yuuki Akihiro
• Sasaki Shunya

Classifications

• F02B19/12

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

• F02B19/16

  Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10 · CPC title

• F02B19/10 Primary

  with fuel introduced partly into pre-combustion chamber, and partly into cylinder · CPC title

• F02M21/02

  for gaseous fuels · CPC title

• F02B19/18 Primary

  Transfer passages between chamber and cylinder · CPC title