Spark ignited internal combustion engine and manufacturing...

Details Spark ignited internal combustion engine and manufacturing... Spark ignited internal combustion engine and manufacturing...

2011-06-07

2011-06-07

Cronin, Stephen K (Department: 3747)

Internal-combustion engines

Precombustion and main combustion chambers in series

With injection means particularly positioned relative to...

C123S279000, C123S305000

Reexamination Certificate

active

07954471

ABSTRACT:
There is provided a spark ignited internal combustion engine having a geometric compression ratio of 13.0 or greater. The engine comprises combustion chambers having a cylinder stroke volume of 0.3 liter or greater, with the spark plug in the chamber ceiling having its spark point in the combustion chamber, and a cavity being formed on the top surface of the piston. At least part of the cavity defines a spherical surface that a hypothetical sphere having its center at the spark point contacts when the piston is at top dead center. The cavity is formed so that V2/V1≧0.31, where V1is top-dead-center combustion chamber volume, and V2is the volume of the part of the hypothetical sphere not interfering with the combustion chamber floor or ceiling at top dead center. The flame thus spreads with less interference, shortening combustion duration and reducing fuel consumption.

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