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Proposal and Verification of Friction Coefficient Calculation Model by True Contact and Oil Film (Evaluation of Piston Ring and Sleeve)

Article of Honda R&D Technical Review Vol.33 No.1

Summary

The investigation of sliding parts takes into account the coefficient of friction of the parts. When the parts are in a relatively high-speed region, such as the piston rings and sleeves in an engine, sliding test performance itself is a challenge and the tribological properties cannot readily be determined. Therefore, surface roughness and waviness after initial familiarity were applied to a stochastic method proposed by Liu, et al., and the oil film thickness reduction coefficient of Gupta, et al., was used in high-speed regions. In addition, a new calculation model was proposed that takes into sliding, which becomes a determining factor in higher-speed regions. As conventionally performed, sliding tests could not readily be implemented in high-speed regions. However, a newly developed drum cam test apparatus has made such testing possible to implement. The validity of this model was verified by comparison and the results of sliding tests up to 8 m/s. The results verified that the coefficient of friction in this model match very closely with the results of tests using ordinary sleeve material of cast gray iron (FC250) in high-speed regions up to 8 m/s. In addition, it has become possible to obtain the coefficient of friction in high-speed regions, which had not been possible to determine up to now. It has also become possible to predict the coefficient of friction in high-speed regions where the velocities are equal to or higher than in the verification tests.

Reference

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Author (organization or company)

Hideharu KOGA(Innovative Research Excellence Power Unit & Energy)、Kenji MATSUMOTO(Innovative Research Excellence Power Unit & Energy)、Yuki ONO(Innovative Research Excellence Power Unit & Energy)