| 摘要 |
PROBLEM TO BE SOLVED: To prevent a plug member filling up an opening part from dropping out after drilling of a lubricant passage installed in a crankshaft of a small-sized engine. SOLUTION: In the crankshaft where the lubricant passage 9 installed inside is formed at an outer surface of a crank web 2 is communicated with an opening, the plug member 11 is filled up inside the opening, and a counter weight 16 is adhered to the crank web 2, the plug member 12 is prevented from dropping out with the counter weight 16. COPYRIGHT: (C)2003,JPO
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