US 9,200,559 B2Granted

Combustion chamber for large gas engine

AssigneeKawasaki Jukogyo Kabushiki Kaisha

InventorsHiroyoshi Ishii, Tetsuo Tokuoka

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Abstract

Provided is a combustion chamber applied in a gas engine including: a main combustion chamber including, at a central portion of its ceiling, an auxiliary combustion chamber; and a piston. A peripheral portion of a top surface of the piston is a flat surface. A raised portion, which has a curved surface and which is a solid of revolution, is formed at a central portion of the top surface, the raised portion being joined to the flat surface of the peripheral portion via a curved surface. When the piston is positioned at a top dead center, nozzle holes of the auxiliary combustion chamber jet out flame jets to a portion at which the raised portion of the top surface of the piston and the flat surface of the peripheral portion of the top surface of the piston are joined together.

Claims11

Dependent claims

A gas engine combustion chamber applied in a gas engine including:

a main combustion chamber including, at a central portion of its ceiling, an auxiliary combustion chamber having nozzle holes exposed within the main combustion chamber;
and a piston inserted in the main combustion chamber in a slidable manner, wherein
a peripheral portion of a top surface of the piston is a flat surface,
a raised portion is formed at a central portion of the top surface of the piston, the raised portion being raised upward from the peripheral portion,
the nozzle holes of the auxiliary combustion chamber are formed such that, when the piston is positioned at a top dead center, central axes of the respective nozzle holes are directed to a portion, of the piston, at which the raised portion and the flat surface are joined together, and
when the piston is positioned at the top dead center, the nozzle holes of the auxiliary combustion chamber jet out a nozzle gas to the portion, of the piston, at which the raised portion and the flat surface are joined together.

3 more elements

A piston for use in a gas engine, wherein

a peripheral portion of a top surface of the piston is a flat surface,
a raised portion which is a solid of revolution, whose axis of revolution is a central axis of the piston, is formed at a central portion of the top surface, the raised portion being continuously raised upward from a portion at which the raised portion and the flat surface are joined together to a center of the central portion, the raised portion including an upward protruding top portion with a curved surface, and
the raised portion and the flat surface are smoothly continuous with each other.

Dependencies are inferred from the claim text.

Facts

Application: 13/519,414Filed 27 Dec 2010
Priority: JP 2009-29763328 Dec 2009
Published: US 2013/0019837 A124 Jan 2013
Granted: 1 Dec 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

F02B 19/10
Engines characterised by precombustion chambers: with fuel introduced partly into pre-combustion chamber, and partly into cylinder
F01B 3/0085
Details: pistons
F02B 19/18
Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10: transfer passages between chamber and cylinder
F02B 43/04
Engines characterised by means for increasing operating efficiency: for improving efficiency of combustion