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D. Kvarda, M. Omasta, I. Křupka, M. Hartl, "Understanding Grease Retentivity in Wheel-Rail Contact", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 9.13, 2024, doi:10.4203/ccc.7.9.13

Keywords: friction, grease, flange lubrication, retentivity, tribology, wheel-rail contact.

Abstract

This study investigated wheel flange grease retentivity, defined as the distance or duration over which grease can efficiently lubricate a contact surface. The grease analyzed was BECHEM EcoRail 2009, which consists of a bentonite thickener and a synthetic ester base oil. Experiments were conducted using a Mini-Traction Machine in a ball-on-disc configuration. The effects of temperature, air humidity, load, slip, speed, and lubricant quantity on retentivity were examined. The results indicated that increasing load and slip led to a decrease in retentivity, which could be attributed to the frictional energy absorbed by the lubricant. An increase in velocity resulted in a decrease in retentivity when measured over time, but an increase in retentivity when measured by sliding distance. A linear increase in retentivity was observed with a higher amount of lubricant. Temperature increases led to an enhancement in retentivity, provided the temperature stayed within the operational range of the grease. Air humidity impacted retentivity only when condensation occurred, which resulted in an increase in retentivity.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 7 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 9.13 Understanding Grease Retentivity in Wheel-Rail Contact D. Kvarda, M. Omasta, I. Křupka and M. Hartl Institute of Machine and Industrial Design, Brno University of Technology, Czech Republic doi:10.4203/ccc.7.9.13 Full Bibliographic Reference for this paper D. Kvarda, M. Omasta, I. Křupka, M. Hartl, "Understanding Grease Retentivity in Wheel-Rail Contact", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 9.13, 2024, doi:10.4203/ccc.7.9.13 Keywords: friction, grease, flange lubrication, retentivity, tribology, wheel-rail contact. Abstract This study investigated wheel flange grease retentivity, defined as the distance or duration over which grease can efficiently lubricate a contact surface. The grease analyzed was BECHEM EcoRail 2009, which consists of a bentonite thickener and a synthetic ester base oil. Experiments were conducted using a Mini-Traction Machine in a ball-on-disc configuration. The effects of temperature, air humidity, load, slip, speed, and lubricant quantity on retentivity were examined. The results indicated that increasing load and slip led to a decrease in retentivity, which could be attributed to the frictional energy absorbed by the lubricant. An increase in velocity resulted in a decrease in retentivity when measured over time, but an increase in retentivity when measured by sliding distance. A linear increase in retentivity was observed with a higher amount of lubricant. Temperature increases led to an enhancement in retentivity, provided the temperature stayed within the operational range of the grease. Air humidity impacted retentivity only when condensation occurred, which resulted in an increase in retentivity. download the full-text of this paper (PDF, 8 pages, 960 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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