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Keywords = piston pin bore

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12 pages, 4710 KiB  
Article
Measurement of Piston Pin-Bore Oil Film Pressure under Engine Operation
by Takumi Iwata, Michiyasu Owashi, Masakuni Oikawa, Yuji Mihara, Kunihiko Kobayashi and Naoki Yamakawa
Lubricants 2022, 10(10), 258; https://doi.org/10.3390/lubricants10100258 - 13 Oct 2022
Cited by 3 | Viewed by 3231
Abstract
Thin-film sensors were used to measure the oil film pressure distribution at the piston pin-bore interface in order to ascertain the stress distribution on the piston pin of a gasoline engine during actual operation. Thin-film sensors have been manufactured by a sputtering method [...] Read more.
Thin-film sensors were used to measure the oil film pressure distribution at the piston pin-bore interface in order to ascertain the stress distribution on the piston pin of a gasoline engine during actual operation. Thin-film sensors have been manufactured by a sputtering method to a total film thickness of about 3–6 μm. The features of thin-film sensors have been utilized to successfully measure the oil film pressure on engine main bearings, connecting rod bearings and piston skirts of both diesel and gasoline automotive engines. However, as engine lubrication conditions have become more severe year by year, it has become necessary to develop thin-film pressure sensors with higher durability. The use of diamond-like carbon (DLC) coating for the protective film of the thin-film sensor has enabled accurate measurement of oil film pressure under engine operating conditions. The AVL EXCITETM Power Unit was used in simulations with the application of elastic fluid lubrication theory. The calculated values were compared with measured data, and a comparison was made of the effect of the model constraint condition. Full article
(This article belongs to the Special Issue Friction and Wear of Coatings/Films)
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