Thermal Barrier for a Piston
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United States of America Patent
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Issued Date -
Nov 27, 2014
app pub date -
May 22, 2014
filing date -
May 22, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
It is important to maintain the temperature in the ring pack area of the piston of an internal combustion engine below about 270° C. to maintain proper ring function and lubrication. Disclosed is a piston with a heat barrier groove between the piston top and the ring pack and a method to construct such a piston. The heat barrier groove extends inwardly toward the center of the piston a greater distance than the compression ring grooves. In one embodiment, a low thermal conductivity material is placed in the inner portion of the heat barrier groove and a split ring is place in the outer portion. In another embodiment, a gas is provided in the inner portion and the split ring is welded to the piston so that the inner portion of the heat barrier groove is sealed, i.e., welding at the upper and lower edges and at the gap.
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