Invention Application
US20160208735A1 COMPLEX-SHAPED FORGED PISTON OIL GALLERIES 审中-公开
复合型活塞式活塞油箱

COMPLEX-SHAPED FORGED PISTON OIL GALLERIES
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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