| 摘要 |
A two-stroke diesel or gas fueled multi-cylinder engine utilizes a re-circulating type constant pressure feed lubrication system and is equipped with a supercharger or turbocharger combination connected in series to assist in charging the cylinders with air and also assists in scavenging the exhaust gases. The piston head is domed to assist the flow of the scavenging air in an upward direction toward the inside of the cylinder, and to facilitate the flow of exhaust gases to atmosphere. The scavenging port and exhaust port openings are formed in the same plane through the walls of the cylinder above the bottom dead center position of the piston head. The lower side of the scavenging port opening inclines inwardly and upwardly toward the cylinder wall so that the flow of scavenging air creates a turbulent action as it enters inside the cylinder for efficient scavenging of the exhaust gases. The scavenging port and exhaust port openings are both uncovered and covered simultaneously by the reciprocating piston passing thereby. A sealing "O" ring is installed into an annular groove formed in each boss of the piston adjacent the end portions of the wristpin to prevent the escape of lubricating oil and it should also be noted that the oil scraper ring which is installed in an annular groove around the bottom edge portion of the piston skirt with drain holes extending through the groove remains below the exhaust port and scavenging port openings at all times to prevent lubricating oil from escaping therethrough.
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