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Tribological evaluation of piston ring/cylinder liner assembly in automotive engines using GNP as a lubricant additive
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science ( IF 2 ) Pub Date : 2021-11-29 , DOI: 10.1177/09544062211055352
Gurtej Singh 1 , Mohammad Farooq Wani 1 , Mohammad Marouf Wani 1
Affiliation  

Friction and wear are the main causes of energy dissipation in automotive engines. To minimize the frictional power losses, it is extremely important to improve the tribological characteristics of ring/liner assembly which accounts for almost 40–50% frictional power losses. The present study attempts to mitigate friction and wear of the ring/liner tribo-pair using GNP/SAE 15W40 nano-lubricant. To simulate the ring/liner interface, the tribological performance of nano-lubricants was assessed using a tribometer based on ASTMG181 standard under various operating conditions. The coefficient of friction (COF) and wear rate lowered using graphene nano-lubricants (GNL). The tribological results showed that friction coefficient, wear rate, and surface roughness of piston ring improved in the range 17.71%–42.33%, 25%–40.62%, and 61%, respectively, under GNL lubricating conditions during the boundary lubrication. Further, the characterization of wear tracks of piston ring and cylinder liner confirmed tribo-film formation on worn surfaces resulting in decreased COF and wear rate.



中文翻译:

使用 GNP 作为润滑油添加剂的汽车发动机活塞环/气缸套组件的摩擦学评估

摩擦和磨损是汽车发动机能量耗散的主要原因。为了最大限度地减少摩擦功率损失,改善环/衬套组件的摩擦学特性非常重要,因为摩擦功率损失几乎占 40-50%。本研究尝试使用 GNP/SAE 15W40 纳米润滑剂减轻环/衬套摩擦副的摩擦和磨损。为了模拟环/衬里界面,使用基于 ASTMG181 标准的摩擦计在各种操作条件下评估纳米润滑剂的摩擦学性能。使用石墨烯纳米润滑剂 (GNL) 降低了摩擦系数 (COF) 和磨损率。摩擦学结果表明,活塞环的摩擦系数、磨损率和表面粗糙度分别提高了 17.71%~42.33%、25%~40.62% 和 61%,在边界润滑期间的 GNL 润滑条件下。此外,活塞环和气缸套磨损轨迹的表征证实了磨损表面上的摩擦膜形成,导致 COF 和磨损率降低。

更新日期:2021-11-29
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