In this work, an assessment of the performance of thermo-oxidated Jatropha oil as a lubricant for actual wet clutch materials was performed and compared with a commercial automatic transmission fluid. For this, Jatropha oil, a commercial automatic transmission fluid and a blend of 20 vol% Jatropha oil–80 vol% automatic transmission fluid were subjected to thermo-oxidative aging at 26 °C and 100 °C, followed by a pin-on-disk testing with disk samples from an actual wet clutch. Evaluation of the film thickness at the sliding interface resulted in a boundary lubrication regime for all the tests. The changes in oxidation, viscosity, and a viscosity index of the samples were evaluated along with friction coefficients at various sliding speeds. Jatropha oil was the most sensitive to thermo-oxidation. Jatropha oil and the blend showed a higher viscosity increase than automatic transmission fluid with thermo-oxidation, while the viscosity index of all oils was decreased considerably, Jatropha oil and the blend being the most reduced. Finally, the anti-shudder property, as measured by the change in the friction coefficient with a sliding speed, of Jatropha oil and automatic transmission fluid was improved by thermo-oxidation at 26 °C but worsened at 100 °C, meanwhile it was barely affected in the blend. Therefore, these results indicate that using pure Jatropha oil as automatic transmission fluid would be unsuitable, but blending it with automatic transmission fluids in specific proportions may be apposite for improving the friction properties of wet clutches even under thermo-oxidative conditions.

在这项工作中，对热氧化的麻风树油作为实际湿式离合器材料的润滑剂的性能进行了评估，并与商用自动变速箱油进行了比较。为此，对麻风树油，一种商用自动变速箱油和20％（体积）的麻风树油-80％（体积）自动变速箱油的混合物进行了26°C和100°C的热氧化老化，然后进行销钉固定。使用来自实际湿式离合器的圆盘样品进行圆盘测试。评估滑动界面处的薄膜厚度会导致所有测试的边界润滑状态。评估了样品在不同滑动速度下的氧化，粘度和粘度指数的变化以及摩擦系数。麻风树油对热氧化最敏感。麻风树油和共混物比带有热氧化作用的自动变速箱油具有更高的粘度增加，而所有油的粘度指数均显着降低，麻风树油和共混物的降幅最大。最后，麻疯树油和自动变速箱油的摩擦系数随滑动速度的变化而测量，通过在26°C下进行热氧化改善，但在100°C下却变差，而几乎在混合中受到影响。因此，这些结果表明，使用纯麻风树油作为自动变速箱油是不合适的，但即使在热氧化条件下，按特定比例将其与自动变速箱油混合也可能会改善湿式离合器的摩擦性能。