Piston, method of construction, and piston body portions thereof
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United States of America Patent
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Mar 13, 2018
Issued Date -
N/A
app pub date -
Apr 12, 2016
filing date -
Dec 23, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A method of constructing a piston, piston formed thereby, and piston body portions are provided. The method includes providing an upper crown portion at least one annular upper rib depending from the upper combustion wall to a free end having a tapered peak. The method further includes providing a lower crown portion having at least one annular lower rib extending to a free end having a tapered peak. Then, moving the upper crown portion and the lower crown portion toward one another and initiating contact between the upper crown portion and the lower crown portion at their respective tapered peaks. Then, continuing moving the upper crown and the lower crown further toward one another after making initial contact at their respective tapered peaks and forming a friction weld joint between the free ends of the at least one upper rib and the at least one lower rib free end.
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