| 摘要 |
An internal combustion engine includes a piston ( 2 ) and a crankshaft ( 33 ). The crankshaft ( 33 ) includes: a journal ( 33 A) as a rotation center; a crank pin ( 33 B) that is located eccentrically with respect to the journal ( 33 A) and rotates integrally with the journal ( 33 A), the crank pin ( 33 b) connecting the piston ( 2 ) to the crankshaft ( 33 ); and a counter weight ( 33 C) that is located eccentrically with respect to the journal ( 33 A) in a direction opposite to the crank pin ( 33 ) and rotates uniformly with the journal ( 33 A). A cutout ( 11 ) through which the counter weight ( 33 C) passes is formed in a wall ( 1 ) of a cylinder bore that accommodates the piston ( 2 ) so as to be free to move reciprocally along the wall ( 1 ). As a result, the bottom dead center position of the piston can be lowered, and the overall height of the engine can be decreased.
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