Evaluation of thermo-oxidized Jatropha bio-oil in lubrication of actual wet clutch materials

Author:

Farfan-Cabrera Leonardo I1ORCID,Gallardo-Hernández Ezequiel A2ORCID,Pérez-González José3,Marín-Santibáñez Benjamín M4,Lewis Roger5ORCID,González-Lamas Ana K2

Affiliation:

1. Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey, N.L., México.

2. Instituto Politécnico Nacional, SEPI-Escuela Superior de Ingeniería Mecánica y Eléctrica, U.P. Adolfo López Mateos, Grupo de Tribología, Ciudad de México, Mexico

3. Instituto Politécnico Nacional, Escuela Superior de Física y Matemáticas, Laboratorio de Reología y Física de la Materia Blanda, U.P. Adolfo López Mateos, Ciudad de México, Mexico

4. Instituto Politécnico Nacional, Escuela Superior de Ingeniería Química e Industrias Extractivas, U.P. Adolfo López Mateos, Ciudad de México, Mexico

5. Department of Mechanical Engineering, The University of Sheffield, UK

Abstract

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.

Publisher

SAGE Publications

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering

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