汽缸失活对活塞压缩环和连杆轴承摩擦学性能的影响外文文献.pdfVIP

Tribology International 120 (2018) 243–254 Contents lists available at ScienceDirect Tribology International journal homepage: /locate/triboint Effect of cylinder deactivation on tribological performance of piston compression ring and connecting rod bearing N. Morris a, M. Mohammadpour a, R. Rahmani a, *, P.M. Johns-Rahnejat a, H. Rahnejat a, b D. Dowson a Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Leicestershire, UK b School of Mechanical Engineering, University of Leeds, Leeds, UK A R T I C L E I N F O A B S T R A C T Keywords: Thermo-mixed-hydrodynamics of compression rings and big-end bearings are presented. Frictional losses under Cylinder deactivation normal engine operating conditions for a gasoline engine and those with cylinder deactivation (CDA) are pre- Piston compression ring dicted. With CDA, the combustion chamber pressure increases in the active cylinders, whilst some residual Big-end bearing pressure remains in the deactivated ones. For the former, the increased in-cylinder temperatures reduce viscous Friction friction, whilst reducing the load carrying capacity, promoting increased boundary interactions. In deactivated Power loss cylinders, lower contact temperatures yield increased viscous friction. Overall, a 5% improvement in expended