Power unit case configured to house both an engine and a transmission, and power unit including same
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United States of America Patent
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Aug 24, 2010
Grant Date -
Mar 6, 2008
app pub date -
Aug 14, 2007
filing date -
Aug 30, 2006
priority date (Note) -
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Abstract
A power unit case for a power unit, including an internal combustion engine and a transmission, makes it possible to enhance the lubrication of a desired meshing portion of a group of transmission gears, while reducing the size of the engine. In the power unit case, a main shaft is arranged above a space between a crankshaft and a counter shaft arranged at a position substantially horizontally behind the crankshaft. A gear-ratio selecting member is arranged above a group of transmission gears on the counter shaft whose upper portion rotates toward a meshing portion between groups of transmission gears, and a lubricating projection that projects downwardly is formed in the transmission case above each of the transmission gears on the counter shaft and at a location on a ceiling surface of the transmission case where the gear-ratio selecting member is supported.
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