| 摘要 |
A balance weight system of a crankshaft includes a first balance weight in which a mass center thereof ranges from approximately +78 to approximately +82 degrees based on the horizontal line, a ninth balance weight in which a mass center thereof ranges from approximately −82 to approximately −78 degrees, a second balance weight in which a mass center thereof ranges from approximately +86.5 to approximately +89 degrees, a eighth balance weight in which a mass center thereof ranges from approximately −89 to approximately −86.5 degrees, and at least one balance weight group of which size of rotational inertia moment thereof ranges from approximately 13 to approximately 17% compared with the first or ninth balance weight, wherein rotational inertia moment size of the second and eighth balance weights ranges from approximately 15 to approximately 25% compared with the first and ninth balance weights.
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