| 摘要 |
<p>A fastening body with loosening preventing ability, where pretension is reliably introduced at an appropriate position and whose fastening ability is improved. A fastening body with loosening preventing ability is constituted of a bolt (3), a washer (12), and a nut (11). The washer (12) has a circular-conical cylinder body (12c) formed by providing a bolt through-hole (12b) vertically in a decentered (S) truncated circular cone, the truncated circular cone being formed at the center of a base section (12a) and being reduced in diameter in the direction axially upward of the bolt (3), the through-hole having a diameter slightly greater than the nominal diameter of the bolt (3). On the washer (12) rises an arc-like standing wall (12d) that is formed by cutting a part of the circular conical tubular body (12c) such that only a thick wall section (12e) remains in an arc that is smaller than a semicircle. In the nut (11), a truncated circular cone-like hole section (11a) in which the truncated circular cone fit is provided at a half portion of the nut, the half portion being on the side facing the washer (12). The fastening body is adequate for applications that are subjected to excessive vibration and where maintenance is indispensable.</p> |
