摘要 |
PROBLEM TO BE SOLVED: To provide a crankshaft saving material and weight. SOLUTION: A crank arm part M of the crankshaft K is formed from a tentative shape m formed to be symmetrical with respect to the center axis by increasing widths fa-fd of parts generating a relatively low possibility of compressive stress to the widths Fa-Fd in order to reduce thickness, and a prescribed function part B is formed on the crank arm part M to reduce torque imbalance caused by reduction of thickness and keep balance.
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