FASTENING NUT

WIPO Patent Application WO/2019/131685

A1

Provided is a nut in which, by moving the fastening force in bolt-nut fastening toward the open side of the nut and increasing the load sharing among the threads from the third thread on, it is possible to reduce the load on the first engaged thread, which bears the maximum load, and extend the fatigue life of the bolt with respect to crack-axis fracturing. A first embodiment of the nut is configured such that, with regard to the shape of the nut in a longitudinal sectional view, a space having a convex shape on the top is formed concentrically, centering on the thread axis, on the fastening-side nut face. The convex space is a structure in which a convex space is formed as a shape connected by straight lines, curved lines, or a combination of both. By forming said space such that, when L2 is the depth of the convex space from the nut face and L1 is the axial-direction length of the nut from the first root of a complete thread portion to the nut face, said convex space depth L2 is in the range of L1 < L2 ≤ L1 + 5 lengths of the thread pitch, more of the stress on the threads of the nut during fastening is moved to the third thread on toward the open side of the nut and load concentration on the first engaged thread of the nut and the bolt is reduced.

MATSUO MAKOTO (JP)
HAYASHIDA TATSUAKI (JP)
IWAMOTO YOSHINAO (JP)

PCT/JP2018/047682

July 04, 2019

December 25, 2018

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MATSUO IND CORPORATIONS (JP)
IMOTT INC (JP)

F16B31/02; F16B33/06; F16B37/00

JPS57177922A	1982-11-01
JPS5945320U	1984-03-26
JP2003004016A	2003-01-08
JP2005282668A	2005-10-13
JPS59166010U	1984-11-07
JPS61136013A	1986-06-23
JPS465709Y1	1971-03-01
JP2010209714A	2010-09-24
US5927921A	1999-07-27

AOKI, Atsushi et al. (JP)

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