Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Patent
1994-09-29
1995-12-26
Okonsky, David A.
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
1231932, 123668, F02B 7711, F02B 7508
Patent
active
054778204
ABSTRACT:
Heat engine piston and combustion chamber construction enclosing a gas combustion zone, comprising: a piston body having a crown facing said gas combustion zone; combustion chamber surfaces cooperating with said piston to complete enclosure of said zone; and a thermal diffusivity coating on said crown and combustion chamber surfaces having an effective thickness to operate as a thermal diode to restrict heat transfer to said piston body and combustion chamber and to restrict heat transfer to said combustible charge prior to combustion. A method of thermally managing heat generated by an internal combustion engine, the engine having combustion chamber walls for combusting a gaseous mixture of air and fuel, a cooling jacket for cooling said walls, and a piston moveable along a portion of said walls, comprising: increasing the compression ratio of the engine to induce engine-knock for an uncoated chamber; coating at least the crown of the piston of said combustion chamber walls with a low thermal diffusivity layer that functions as a heat diode to restrict heat transfer in both directions normal to the coating; operating said engine with said coating chamber wall and increased compression ratio, whereby fresh intake of combustible mixture to said combustion chamber will be drawn thereinto at a lower temperature and volumetric efficiency with less heat from said combustion being wasted to said cooling jacket.
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Ford Motor Company
Malleck Joseph W.
May Roger L.
Okonsky David A.
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