| 摘要 |
A piston is disclosed having both downwardly and upwardly inclined piston ring grooves, the grooves being angled less than approximately ten degrees with respect to a horizontally extending axis. In a preferred embodiment, the grooves are less than approximately three degrees in inclination and in a most preferred embodiment, the inclination is less than approximately one degree. The grooves for the combustion seal are angled upwardly from an outer diameter of the piston to adjust for thermal drooping of the piston rings received within the grooves. The grooves for the oil-control seal are angled downwardly so that oil is scraped downwardly, but the oil control ring hydroplanes over the oil when the piston moves upwardly.
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