Pre-chamber arrangement for a gas engine and a gas engine

Patent metadata

Field	Value
Publication number	US-11261778-B2
Application number	US-201917282010-A
Country	US
Kind code	B2
Filing date	Oct 7, 2019
Priority date	Oct 11, 2018
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A pre-chamber arrangement ( 100 ) for a gas engine ( 1 ), including a pre-chamber body ( 20 ) accommodating a volume ( 30 ); and a supply device ( 50 ) for supplying a gaseous medium ( 52 ) into the pre-chamber volume ( 30 ); wherein the pre-chamber body ( 20 ) has a bottom portion ( 22 ) with channels ( 40 ) for allowing gas to flow between the pre-chamber volume ( 30 ) and a main combustion chamber ( 10 ) of the gas engine ( 1 ). Each channel ( 40 ) extends along a channel axis (C) from an inner opening ( 42 ) facing the pre-chamber volume ( 30 ) to an outer opening ( 44 ) configured to face the main combustion chamber ( 10 ). The bottom portion ( 22 ) has a curved outer surface ( 24 ). The channels ( 40 ) are obliquely arranged in relation to a radius (r) of the bottom portion ( 22 ). The bottom portion has flat surfaces ( 46 ) surrounding the outer openings of the channels.

First claim

The invention claimed is:

1. A pre-chamber arrangement for a gas engine, the arrangement comprising:
a pre-chamber body accommodating a volume extending longitudinally along a centre axis; and
a supply device for supplying a gaseous medium into the pre-chamber volume wherein the pre-chamber body comprises a bottom portion comprising a curved outer surface;
the bottom portion of the pre-chamber body extends into the main combustion chamber;
channels in the bottom portion for allowing gas to flow between the pre-chamber volume and a main combustion chamber of the gas engine;
the bottom portion, of the pre-chamber body extends into the main combustion chamber;
each channel extends along a respective channel axis from an inner opening facing the pre-chamber volume to an outer opening of the channel configured to face the main combustion chamber;
wherein the channels are arranged such that the respective channel axis of each channel does not intersect the centre axis of the pre-chamber volume, and in that the bottom portion comprises flat surfaces surrounding the outer openings of the channels.

2. The arrangement according to claim 1 , wherein the bottom portion comprises at least six channels.

3. The arrangement according to claim 1 , wherein the channels are arranged with the respective channel axis extending at an angle in the range of 5-15 degrees in relation to a radius of the bottom portion, the radius of the bottom portion extending from where the channel axis intersects the outer opening of the channel.

4. The arrangement according to claim 1 , wherein the inner opening has an oval or elliptical shape.

5. The arrangement according to claim 1 , wherein each channel has a constant cross-sectional diameter.

6. The arrangement according to claim 1 , wherein the outer opening of each channel comprises a rounding or a chamfer.

7. The arrangement according to claim 1 , wherein each channel extends obliquely downwards from the pre-chamber volume towards the main combustion chamber.

8. A gas engine, comprising at least one cylinder, wherein the gas engine further comprises a pre-chamber arrangement according to claim 1 .

Assignees

• Scania Cv Ab

Inventors

• Lejon Svante
• Axelsson Pål

Classifications

• F02B19/12

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

• F02B19/18 Primary

  Transfer passages between chamber and cylinder · CPC title

• F02B2710/00

  Gas engines · CPC title

• F02B19/1023

  pre-combustion chamber and cylinder being fed with fuel-air mixture(s) · CPC title

• F02B19/08

  the chamber being of air-swirl type · CPC title