Patent ID: 6832590
Filing Date: 2004-12-21
Classification: F02B

Abstract:
An internal combustion engine, comprising:a crankshaft; a mainshaft of a transmission, said mainshaft holding a transmission gear train; a clutch, said clutch being disposed on an extension of said mainshaft; and a countershaft of the transmission, said countershaft for holding a gear train to be meshed with the transmission gear train, wherein power is transmitted in order from the crank shaft to the clutch, the main shaft, and the countershaft, and said mainshaft is disposed substantially directly below said crankshaft, and wherein a crank chamber is defined by upper and lower case members, said crankshaft is held between the upper and the lower case members, the mainshaft is adapted to be attached on the lower case member, and at least a part of a crank bearing and a main bearing are shifted with respect to each other so as to be located at different axial positions.