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Priority claimed from JP34721793Aexternal-prioritypatent/JP3406039B2/en
Application filed by Yamaha Motor Co LtdfiledCriticalYamaha Motor Co Ltd
Priority claimed from JP18488895Aexternal-prioritypatent/JPH0913978A/en
Application grantedgrantedCritical
Publication of TW268075BpublicationCriticalpatent/TW268075B/en
The present invention relates to a supercharged engine of the crankcase compression type in which an air chamber formed inside the crankcase which connects to the combustion chamber serves as a compression chamber with the connecting rod between the crankshaft and the piston forming a compressor element by changing an effective internal volume of the crankcase in which at least that end of the connecting rod that connects to a respective piston pin of the piston head has a strength higher than other regions of the connecting rod, or the connecting rod comprises the cylindrical ends, a linkage connecting the two endsand having a compressing face, and a hollow to reduce the weight of the linkage.