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Measurement of Piston Skirt Oil-film Pressure when Piston Slap Noise Occurs

Article of Honda R&D Technical Review Vol.19 No.1

Summary

A small thin-film pressure sensor that does not affect the piston skirt surface geometry, stiffness, and mass was directly deposited onto the piston skirt surface by physical vapor deposition, and the oil-film pressure on the skirt surface which is closely related to the cylinder liner excitation force when piston slap noise occurs was measured. The oil-film pressure corresponding to the cylinder liner acceleration, which is an indicator of piston slap noise, was measured in an engine under running condition, and the accuracy of this measurement was confirmed. It was also possible to measure the change in the oil-film pressure distribution on the piston skirt surface corresponding to changes in engine speed and the piston pin offset. The difference of the oil-film pressure on the piston skirt surface when the piston collides with the cylinder liner, which was not possible to explain from cylinder liner acceleration alone, allowed the mechanism where the piston secondary motion differs to be identified. As a result, the accuracy of the piston secondary motion simulation was enhanced, enabling effective measures against piston slap noise to be studied.

Reference

(1) Künzel, R., Tunsch, M., Werkmann, M.: Piston Related Noise with Spark Ignition Engines – Characterization, Quantification and Mechanism of Excitation, SAE Paper, 2000-01-3311 (2000)
(2) Mihara, Y.: Development of Measuring Method for Oil Film Pressure of Engine Main Bearing by Thin Film Sensor, Dissertation, Musashi Institute of Technology (1995)
(3) Mihara, Y., Someya, T., Kobayashi, K., Kusunoki, T.: Development of a New Thin Film Sensor for the Measurement of Oil Film Pressure, Japanese Society of Tribologist, International Tribology conference Nagasaki 2000, p. 1621-1626 (2000)
(4) Mihara, Y., Someya, T.: Measurement of Oil-film Pressure in Engine Bearings Using a Thin-film Sensor, Society of Tribologists and Lubrication Engineers Paper, Vol. 45, p. 11-20 (2002)
(5) Satoh, K., Machida, K., Makino K.: Effect of Connecting Rod Big End Stiffness on Oil Film Pressure, HONDA R&D Technical Review, Vol. 12, No. 1, p. 33-38
(6) Machida, K., Makino, K., Satoh, K.: Analysis of Engine Plain Bearings Seizure by the Bearing Tester, HONDA R&D Technical Review, Vol. 12, No. 1, p. 39-44
(7) Kobayashi, T., Take, K., Kamiya, M., Takahashi, Y.: Piston Slap-noise Prediction by Three-dimensional Piston Secondary Motion Simulation, Honda R&D Technical Review, Vol. 19, No. 1, p.156-162

Author (organization or company)

Mitsuyoshi KAMIYA(Automobile R&D Center)、Toshiaki KOBAYASHI(Automobile R&D Center)、Kazuhide TAKE(Automobile R&D Center)、Yukitaka TAKAHASHI(Automobile R&D Center)、Yuji MIHARA(Musashi Institute of Technology)、Tsuneo SOMEYA(The University of Tokyo, Professor Emeritus)

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