A THOROUGH COMPARISON OF TWO INDUSTRIAL GEAR OILS WITH A NATURAL AND MINERAL BASE
Journal Title: Tribologia - Year 2009, Vol 227, Issue 5
Abstract
At ITeE PIB in Radom, an ecological industrial gear oil, denoted as Arol P220, has been formulated. The oil is based on the mixture of rapeseed and castor oils, and is a substitute for a VG 220 commercial gear oil with a mineral base. Arol P220 fulfils the most important requirements of the domestic standard PN-C-96056:1990 concerning the physico-chemical characteristic and tribological performance. However, greater and greater attention is being put on other properties not included in the mentioned standard. They are friction, resistance of gears to scuffing under severe conditions, resistance of gears to pitting and micropitting, fatigue life of rolling elements of bearings, gear vibrations, thermo-oxidative stability of the oil after long-lasting gear experiments, and physico-chemical oil stability during a long-lasting storage. This is why a number of additional tests were performed four-ball tests (pure sliding and rolling contacts), gear tests and physico-chemical analyses. The ecological oil and its commercial, mineral equivalent were compared. Standardised and the authors test methods were carried out, not included in the PN-C-96056:1990 standard. The results show that Arol P220 reduces friction and improves the resistance of gears to micropitting compared with the mineral oil. Under conditions of dip lubrication (the gear pitting tests), the ecological oil reduces the level of vibrations in comparison with the mineral oil, but during the gear micropitting tests (spray lubrication) a reverse trend is observed. However, there are significant drawbacks to the ecological oil. They are the unfavourable change (drop) in the viscosity index during long-lasting storage, worse thermo-oxidative stability (much viscosity rise) after the gear experiments, and a drop in the resistance of gears to scuffing under very large loads. The worst drawback is a significant acceleration of pitting of bearing balls. When removal of these drawbacks appears impossible, they can be partly compensated by a shorter time of storage and exploitation of the ecological oil and using it for lubrication of gears working under moderate conditions.<br/><br/>
Authors and Affiliations
Waldemar Tuszyński, Elżbieta Rogoś, Andrzej Urbański
Keywords
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