| 摘要 |
PURPOSE:To satisfactorily prevent looseness of a bolt by providing a solid part around the through hole of a block to give sufficient compression rigidity so as to enable the bolt to be elongated sufficiently. CONSTITUTION:A connecting rod is joined with a cap 20 by screwing a bolt 172 and a nut 174 with each other. The bolt 172 has a sufficient length and a part around a through-hole in a block 26 is solid and has sufficient compression rigidity. With the bolt 172 tightened, it can be expected that the bolt is elongated sufficiently, whereby satisfactorily preventing looseness of the bolt 172.
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