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Reliability design of a crankshaft subjected to repetitive loads.

Author(s) : WOO S. W., OH S., KIM C., et al.

Summary

Based on the field data from units sold in the market and laboratory data from a tailored set of accelerated life tests, a crankshaft from a compressor used in side-by-side refrigerators was redesigned to improve reliability. Using standard mass and energy conservation balances, a variety of loads were estimated and analyzed for the refrigerator cycles. Experimental data indicated that the failure modes and mechanisms for the failures were locking of the compressor due to crankshaft wear. These modes were similar to those found in the failures in the field samples. Failure analysis, accelerated life tests, and corrective actions were used to identify the sources of the failures. Redesigns of the compressor shaft included redesigns of hole position and grooves of the crank shaft for oil lubrication, hardening the crankshaft, and eliminating interference of the thrust washer. The estimated life, B1, of the new design is now guaranteed to be over 10 years with the annual failure rate of 0.01%.

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Pages: ICR07-B2-141

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Details

  • Original title: Reliability design of a crankshaft subjected to repetitive loads.
  • Record ID : 2008-0125
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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