5222 ポリマー添加油の油膜形成能とEHLトラクション(S65-6 潤滑機構,S65 トライボロジーの基礎と応用)

概要

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Oil film thickness and traction characteristics were determined for some polymer containing oils with the EHL testers, in which the kinematic viscosity of the oils tested was adjusted at the same level under an experimental temperature and the concentration of polymer solution was adjusted at the same level. The base oil of the oils tested was PAO4 and the polymers employed were the specially designed polymethacrylates PMAs. When comparison was made between measurements and calculated results using the low shear viscosity of polymer solution under the high rolling speed region, the experimental data for the short alkyl chain PMA showed a better oil film formability than long alkyl chain PMAs at the same level kinematic viscosity. On the other hand, it is common that the measurements for polymer solutions deviated upwards from the calculated results. Moreover, under very low speed region, a decline in oil film thickness with rolling speed depends upon the polymer type. All the polymer containing oils showed somewhat higher coefficient of traction in high slide/roll ratios than the base oil.
2006-09-15