Power unit for a motorcycle
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 23, 2003
Grant Date -
Apr 4, 2002
app pub date -
Oct 3, 2001
filing date -
Oct 3, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The power unit for a motorcycle comprising an engine unit having a casing in which a crankshaft and a countershaft are rotatably supported in parallel to each other, and a transmission unit having a casing in which a transmission input shaft and a transmission output shaft are rotatably supported in parallel to each other to define a dry belt drive-type transmission device. The transmission input shaft of the transmission unit is being connected to the countershaft of the engine unit so as to be rotatable together with the countershaft. A cooling fan chamber is provided at a joined portion of the casing of the engine unit to the casing of the transmission unit, said cooling fan chamber is communicated with an inside and outside of the casing of the transmission unit. A cooling fan is disposed in said cooling fan chamber so as to rotate together with the connecting portion of the countershaft and the transmission input shaft in a vicinity of said connection section. The cooling fan introduces cooling air into the casing of the transmission unit.
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