| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw tightening structure having high fatigue strength, and a screw manufacturing method capable of easily realizing the screw tightening structure. SOLUTION: By assuming that meshing parts Ej of a crest of a male screw and a trough of a female screw exist by the number of only M in a fitting part of the male screw B and the female screw N in this screw tightening structure 1, a male screw pitch adjustment amountκis determined so that t(1) becomes substantially equal to t(M) in accordance with male screw tightening load F, a tightening formal coefficient v, and a bottom applied load coefficient u when a load burden rate t(j) in each meshing part from the first to the Mth is approximated with t(j+2)=-t(j)+ 2+(cN+cB)/(aN+aB)}×t(j+1), [j=1,..., M-2] t(2)= 1+(cN+cB)/(aN+aB)}×t(1)-L0, t(1)+t(2)+t(3)+...+ t(M-2)+t(M-1)+t(M)=1+u, wherein L0=(v×cN+u×cB+κ×pN/F)/aN+aB) by a difference.
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