Piston assembly
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United States of America Patent
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Mar 22, 2016
Grant Date -
Jan 1, 2015
app pub date -
Jun 23, 2014
filing date -
Jul 1, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A piston assembly includes: a piston skirt; and a piston crown formed by a casting method and coupled to an upper portion of the piston skirt by using a stud bolt, wherein oil galleries are formed between an upper wall of the piston skirt and an upper wall of the piston crown, wherein an annular part having a circular ring shape and a plurality of ribs having a linear shape and radially arranged to form oil channels for flowing cooling oil are formed on the upper wall of the piston crown, and the plurality of ribs are divided into outer ribs and inner ribs by the annular part.
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