Experimental investigation of porous bearings under different lubricant and lubricating conditions |
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Authors: | Email author" target="_blank">Ertu?rul?DURAKEmail author |
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Affiliation: | (1) Mechanical Engineering Dept., Suleyman Demirel University, 32260 Isparta, Turkey |
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Abstract: | The performance of porous bearing under different lubricants and lubricating conditions was experimentally investigated in
this study. In order to carry out the experiments, a new test rig was designed to determine the tribological properties of
based sintered bronze journal bearings that were manufactured by powder metallurgy (P/M) techniques. To determine the effects
of lubricating conditions with and without oil supplement (OS) on the tribological characteristics of these bearings under
static loading and periodic loadings, some experiments were carried out using different lubricants. In the tests, pure base
oil (SAE 20W50), two fully formulated commercial engine oils (SAE20W50) and lubricating oils with commercial additive concentration
ratio of3% were used. The worn surfaces of test bearings were examined using optical microscopy. Experimental results showed that the
change in friction coefficient was more stable and in smaller magnitude under static loading than that of periodic loading.
In addition, the friction coefficient and the wear rate conducted with base oil resulted in higher values than those of fully
formulated oils with and without OS lubricating conditions. The experimental results obtained in this study indicated that
the correct selection of lubricant and suitable running conditions were very important on the tribological characteristics
of porous bearings. |
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Keywords: | Powder Metallurgy Journal Bearings Static and Periodic Loading Friction Coefficient Wear With-Without Oil Supplement Lubricating Conditions |
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