Stress Analyses of the Big End of Diagonally Split Connecting Rod. Shapes of Serrations.

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  • 斜め割り連接棒大端部の強度について　セレーション形状に関する基礎的考察
  • ナナメワリ レンセツボウ ダイタンブ ノ キョウド ニ ツイテ セレーション

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The big end of a connecting rod of medium-speed diesel engines is frequently diagonally split to reduce its width to enable easy assembly and disassembly. Accordingly, shearing forces occur along the interface between the shank and cap. To support these shearing forces, serrations which have shapes similar to screw threads are machined at both contact surfaces. It is reported that failure is sometimes observed around serrations, which seems to be caused by stress concentrations at the root of serrations and the relative displacement between mating surfaces. In this study, the strength of serrations subjected to basic loading, such as compression, shear and bending, is analyzed by FEM which deals with elastic contact problems, where the effects of the configuration of serration, pitch errors of the serration occurring during machining and coefficients of friction at contact surfaces are estimated. In addition, the effects of the distance between the serration and the blind hole in which a crank pin bolt is tapped, are also discussed by employing the axisymmetric model.

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