JPS60194612U

JPS60194612U - Fastening structure

Info

Publication number: JPS60194612U
Application number: JP8456884U
Authority: JP
Inventors: 須山　精人; 槙前　辰己
Original assignee: マツダ株式会社
Priority date: 1984-06-06
Filing date: 1984-06-06
Publication date: 1985-12-25

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１〜３図は本考案の１実施例を示すもので、第１図は
該実施例が適用されたヘッドボルトによる締結構造を示
す要部概略縦断面図、第２図はヘッドボルトの螺合部分
周辺を示す第１図の要部拡大図、第３図は該ボルト表面
付近に作用する応力の分布を従来例と比較して示すグラ
フである。また、第４〜６図は従来例を示すもので、第
４図はヘッドボルトによる締結構造を示す要部概略縦断
面図、第５図は該ヘッドボルトの表面付近の応力分布を
示すグラフ、第６図はヘッドボルトの螺合部周辺を示す
要部拡大図である。２・・・シリンダブロック（締結部材）、２ｂ・・・雌
ねじ部のねじ山、２ｂ’・・・正規の雌ねじ部のねじ山
、５ａ・・・雄ねじ部のねじ山、５ａ′・・・正規の雄
ねじ部のねじ山、５ｂ・・・谷部、５ｂ’・・・正規の
谷部、Ｘ・・・ボルト挿入側端部、Ｌ・・・谷径、Ｌ′
・・・正規の谷径、Ｒ・・・曲イ半径、Ｒ′・・・正規
の曲率半径、Ｈｏ。鴇・・・ねじ山の高さ、Ｈ１′、Ｈ２′・・・正規のね
じ山の高さ。（恨Figures 1 to 3 show one embodiment of the present invention. Figure 1 is a schematic vertical cross-sectional view of the main part showing a fastening structure using a head bolt to which this embodiment is applied, and Figure 2 is a diagram showing a screw thread of the head bolt. FIG. 1 is an enlarged view of the main part showing the vicinity of the joining part, and FIG. 3 is a graph showing the distribution of stress acting near the bolt surface in comparison with a conventional example. 4 to 6 show conventional examples; FIG. 4 is a schematic vertical cross-sectional view of the main part showing a fastening structure using a head bolt; FIG. 5 is a graph showing the stress distribution near the surface of the head bolt; FIG. 6 is an enlarged view of the main part showing the vicinity of the threaded part of the head bolt. 2... Cylinder block (fastening member), 2b... Thread of female thread, 2b'... Thread of regular female thread, 5a... Thread of male thread, 5a'... Regular Thread of male thread, 5b...trough, 5b'...regular valley, X...bolt insertion side end, L...trough diameter, L'
... Regular valley diameter, R... Curvature radius, R'... Regular curvature radius, Ho. Toki: Height of the thread, H1', H2': Height of the regular thread. (Grudge

Claims

[Scope of utility model registration request]

A fastening structure in which a bolt having a male thread is transformed into a fastening member having a female thread in a plastic range, wherein the valley of the male thread part of the bolt is formed at the bolt insertion side end of the threaded part in a state where the male thread and the female thread are completely screwed together. The diameter and radius of curvature of the trough are each larger than that of a regular male thread, and
A fastening structure characterized in that the heights of the threads of the male threaded part and the female threaded part at the bolt insertion side end are lower than those of the regular male thread and female thread.