Auxiliary chamber type internal combustion engine

Patent metadata

Field	Value
Publication number	US-9803536-B2
Application number	US-201414539340-A
Country	US
Kind code	B2
Filing date	Nov 12, 2014
Priority date	Nov 13, 2013
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

Auxiliary chamber type internal combustion engine has a main combustion chamber and an auxiliary chamber having an injection port through which the main combustion chamber communicates. The auxiliary chamber has a passage sectional area which is smoothly decreased toward the injection port. Further, the engine has a fuel injector injecting a fuel into the auxiliary chamber; an ignition plug igniting the fuel in the auxiliary chamber; and a swirl generating portion swirling a gas in the auxiliary chamber. The swirl generating portion swirls only the gas flowing into the auxiliary chamber from the main combustion chamber.

First claim

What is claimed is:

1. An auxiliary chamber type internal combustion engine, comprising:
a main combustion chamber;
an auxiliary chamber having an injection port through which the main combustion chamber communicates, the auxiliary chamber having a passage sectional area which is smoothly decreased toward the injection port;
a fuel injection valve injecting a fuel into the auxiliary chamber;
an ignition plug igniting the fuel in the auxiliary chamber; and
a swirl generating portion disposed on an inner surface of the auxiliary chamber from which a gas flowing from the main combustion chamber to the auxiliary chamber separates, wherein
the swirl generating portion extends spirally in such a manner as to swirl only the gas flowing into the auxiliary chamber from the combustion chamber, and to swirl no gas flowing from the main combustion chamber to the auxiliary chamber.

2. An auxiliary chamber type internal combustion engine, according to claim 1 , further comprising:
a piston having a cavity at a position confronting the injection port.

3. An auxiliary chamber type internal combustion engine, according to claim 1 , wherein
the ignition plug has a grounding electrode which extends from a specified position to a center of the ignition plug, and
the ignition plug is arranged in such a manner that a distance between an injection nozzle of a sub fuel injector and the specified position becomes longest.

4. An auxiliary chamber type internal combustion engine, according to claim 1 , wherein:
the auxiliary chamber includes a cylindrical portion and circular cone portion, and
the circular cone portion is connected to the injection port.

5. An auxiliary chamber type internal combustion engine, according to claim 4 , wherein:
the swirl generating portion in disposed on an inner surface of the circular cone portion of the auxiliary chamber.

Assignees

• Denso Corp

Inventors

• Osaka Jun

Classifications

• F02B19/108

  with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber · CPC title

• F02B19/08 Primary

  the chamber being of air-swirl type · CPC title

• F02B19/1023

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

• Y02T10/125

  Cross-Sectional Technologies · mapped topic

• F02B19/165

  The shape or construction of the pre-combustion chambers is specially adapted to be formed, at least in part, of ceramic material (surface coverings of combustion-gas-swept parts F02B77/02; shaped ceramic products characterised by their composition or ceramic compositions C04B35/00; ceramic material for engine casings F02F7/0087) · CPC title