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Improving the Fatigue Life of Connecting Rods in Chain Saw Engines
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English
Abstract
Steps taken to improve fatigue life of connecting rods in small high performance 2-stroke cycle engines are outlined.
Design and surface treatments to improve the life of conrod bolts are covered, and the design of the cracked joint for minimum stress in the bolts is derived. Optimum case-core ratio at the conrod joint for maximum strength and good break characteristics is worked out.
The hazards of rough spot face surfaces, out-of-square bolts, tight threads, insufficient or too much initial bolt tightening torque are shown. The inadequacy of shot peening in some cases and metallurgical and forging defects are also discussed.
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Authors
Citation
Bailey, J., "Improving the Fatigue Life of Connecting Rods in Chain Saw Engines," SAE Technical Paper 670009, 1967, https://doi.org/10.4271/670009.Also In
References
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- Bidwell Robinson Coleman Mattson Roberts Simpson Thompson “Fatigue Durability of Carburized Steel” American Society of Metals Cleveland 1957
- Roark Raymond J. “Formulas for Stress and Strain.” New York: Toronto; London McGraw-Hill 1954
- Walker R. A. Meyer G. “Fatigue in Bolts.” Machine Design Sept. 15 1966 183 186
- Hentenyi M. “Handbook of Experimental Stress Analysis,” John Wiley & Sons, Inc. 1960 490