| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it possible to easily suppress generation of a gap between a crankcase and a crank bush and suppress generation of striking sound.SOLUTION: In an internal combustion engine comprising: an aluminum or aluminum alloy crankcase; a pair of right and left iron roller bearings 20R and 20L provided on right and left sidewalls of the crankcase, respectively; a pair of right and left iron crank bushes 21R and 21L interposing between the right and left sidewalls of the crankcase and the right and left roller bearings 20R and 20L, respectively; and a crankshaft 2 supported by being inserted into the right and left roller bearings 20R and 20L, the right and left crank bushes 21R and 21L are attached to the right and left sidewalls of the crankcase via a flange portion formed in a radial direction, respectively, and are fastened to the sidewalls by bolts 50 from an axial direction of the crankshaft 2.</p> |
