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Particles Wear-Out Behavior of Reciprocating Engine Crankshaft During the Initial Running-in Operation

Article of Honda R&D Technical Review Vol.27 No.1

Summary

Reciprocating engines are popular in automobile and small airplane applications, and their reliability relies on the operating life of the crankshaft journal bearings.
Traditionally, reciprocating engines have been designed based on an assumed journal wear rate, which is calculated on the basis of the maximum load, maximum velocity, average project area and maximum oil temperature over the entire sliding surface of a journal bearing. A prediction of journal wear rate suggests that engine parts have some allowances to carry loads. From the perspective of energy conservation, it is desirable to minimize, if not eliminate, such gap. However there have been few attempts to examine the real loads on engine journals. Therefore it may be worthwhile to examine engine parts for excessive margins incorporated in the conventional design of reciprocating engines.
This research is intended to propose a method for measuring the load and the pressure distribution on the journal bearing surface with the intention of modernizing the engine design on the basis of tribological data rather than assumption. From this study, the reliability of engine bearings will increase if the wear particles generated during the initial running-in operation.

Reference

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Author (organization or company)

Kenji MATSUMOTO(Automobile R&D Center)

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