Engine piston having an insulating air gap

Details Engine piston having an insulating air gap Engine piston having an insulating air gap

2006-08-18

2010-02-02

McMahon, M. (Department: 3741)

Internal-combustion engines

Particular piston and enclosing cylinder construction

Piston

Reexamination Certificate

active

07654240

ABSTRACT:
A piston for an internal combustion engine has an upper crown with a top and a bottom surface, and a lower crown with a top and a bottom surface. The upper crown and the lower crown are fixedly attached to each other using welds, with the bottom surface of the upper crown and the top surface of the lower crown forming a mating surface. The piston also has at least one centrally located air gap formed on the mating surface. The air gap is sealed to prevent substantial airflow into or out of the air gap.

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