Complex-shaped forged piston oil galleries
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United States of America Patent
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Sep 29, 2020
Grant Date -
Jul 21, 2016
app pub date -
Mar 23, 2016
filing date -
Feb 18, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A piston for an internal combustion engine including a cooling gallery and a complex combustion surface is provided. The piston includes an upper crown member joined to a lower member, for example by hybrid induction welding. A complex combustion bowl is formed in the upper crown member by forging. The combustion bowl includes at least one protrusion, and typically a plurality of protrusions spaced from one another. After the forging step and before the joining step, portions of an undercrown surface located opposite the spaces between the protrusions are machined, and portions located directly opposite the protrusions are left as-forged. The crown member is joined to the lower member, for example by hybrid induction welding.
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