Internal combustion engine with auxiliary combustion chamber

Details Internal combustion engine with auxiliary combustion chamber Internal combustion engine with auxiliary combustion chamber

2007-04-17

2007-04-17

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Precombustion and main combustion chambers in series

Precombustion chamber assembly inserted in spark plug hole

C123S260000, C123S286000

Reexamination Certificate

active

11071284

ABSTRACT:
An internal combustion engine includes a main combustion chamber and a small auxiliary combustion chamber. The main chamber is formed by a cylinder, the undersurface of a cylinder head, and the crown of a piston. A main ignition unit is disposed in the cylinder head, including a main body and a spark plug. The auxiliary chamber is formed within the main ignition unit. The main and auxiliary chambers are connected via a communication passage. The piston crown includes a cavity. When a fuel injection valve sprays fuel into the cavity on compression stroke, a tumble flow of fuel gas is generated to locally form a relatively rich air-fuel mixture near the communication passage. The air-fuel mixture partly flows into the auxiliary chamber as the piston travels upwardly. The air-fuel mixture in the auxiliary chamber is ignited by the spark plug so that a combustion flame propagates into the main chamber.

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