An Improved Lubrication Model between Piston Rings and Cylinder Liners with Consideration of Liner Dynamic Deformations

Guoxing Li, Fengshou Gu, Tie Wang, Xingchen Lu, Li Zhang, Chunfeng Zhang and Andrew Ball
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Guoxing Li: Department of Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Fengshou Gu: Department of Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Tie Wang: Department of Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xingchen Lu: Department of Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Li Zhang: Shanxi Lu’an Taihang Lubricant Co., Ltd., Changzhi 046204, China
Chunfeng Zhang: Shanxi Lu’an Taihang Lubricant Co., Ltd., Changzhi 046204, China
Andrew Ball: Centre for Efficiency and Performance Engineering, University of Huddersfield, Huddersfield HD1 3DH, UK

Energies, 2017, vol. 10, issue 12, 1-22

Abstract: The friction pair of piston rings and cylinder liner is one of the most important friction couplings in an internal combustion engine. It influences engine efficiency and service life. Under the excitation of piston slaps, the dynamic deformation of cylinder liner is close to the surface roughness magnitudes, which can affect the friction and lubrication performance between the piston rings and cylinder assemblies. To investigate the potential influences of structural deformations to tribological behaviours of cylinder assemblies, the dynamic deformation of the inner surface due to pistons slaps is obtained by dynamic simulations, and then coupled into an improved lubrication model. Different from the traditional lubrication model which takes the pressure stress factor and shear stress factor to be constant, the model proposed in this paper calculated these factors in real time using numerical integration to achieve a more realistic simulation. Based on the improved piston rings and cylinder liner lubrication model, the minimum oil film thickness and friction force curves are obtained for an entire work cycle. It shows that the friction force obtained from the improved model manifests clear oscillations in each stoke, which is different from the smoothed profiles predicted traditionally. Moreover, the average amplitude of the friction forces also shows clear reduction.

Keywords: dynamic deformation; lubrication model; piston ring; cylinder liner; friction force (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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