| 摘要 |
<p>The open-ring shaped casting core has a formed-on surface at core bend for forming oil supply opening (9), which is provided in right side region of a pin boss support. A piston (1) includes pin bosses (6,7), which is formed onto piston crown (2) by pin boss support. A formed-on surface for forming an oil drain opening (10) is formed in left side region of support. An oblong formed-on-surface is provided between surface for drain opening and left end of the core, to form continuation of a cooling channel (8).</p> |
