| 摘要 |
A tightening structure for locking, comprising a nut, a bolt, and a hole for passing the bolt therethrough, wherein, to more firm the locking, a recessed part symmetrical with respect to an axis and formed in a generally trapezoidal shape in cross section is formed in the nut on an inner washer side, a projected part symmetrical with respect to the axis and formed in a generally trapezoidal shape in cross section is formed on the washer on an inner nut side, and the recessed part of the nut is fitted to the projected part of the washer, and a hole in the washer is positioned on the inner side of the projected part and the center position of the hole is positioned eccentric to the center position of the projected part of the washer.
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