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Research Papers: Hydrodynamic Lubrication

Research on the Status of Lubricating Oil Transport in Piston Skirt-Cylinder Liner of Engine

[+] Author and Article Information
Jun Sun, Xiang Huang

School of Automotive and
Transportation Engineering,
Hefei University of Technology,
Hefei 230009, China

Guangsheng Liu, Xiaoyong Zhao

School of Mechanical Engineering,
Hefei University of Technology,
Hefei 230009, China

Enming Miao

School of Instrument Science and
Opto-Electronics Engineering,
Hefei University of Technology,
Hefei 230009, China

Guixiang Zhu, Yunqiang Li

Weichai Power Co., Ltd,
Weifang 261001, China

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 21, 2017; final manuscript received December 28, 2017; published online February 6, 2018. Assoc. Editor: Joichi Sugimura.

J. Tribol 140(4), 041702 (Feb 06, 2018) (10 pages) Paper No: TRIB-17-1328; doi: 10.1115/1.4038960 History: Received August 21, 2017; Revised December 28, 2017

The status of the lubricating oil transport in the piston skirt-cylinder liner has important influence on the lubrication of piston assembly frictional pair, the consumption of lubricating oil, the emission, and the performance degradation of lubrication oil. In this paper, based on the model of piston secondary motion, fluid lubrication and lubricating oil flow, the status of the lubricating oil transport between the piston skirt and the cylinder liner on different engine operating condition is calculated, and the quantity of lubricating oil retained on the surface of cylinder liner is mainly analyzed when the piston skirt moves from the top dead center to the bottom dead center. The results show that the variation of the quantity of retained lubricating oil is almost same in the corresponding stroke on different engine operating condition; the quantity of retained lubricating oil is dissimilar at different moment and is equal in principle at the piston top and bottom dead center. The quantity of lubricating oil retention is dissimilar at different moment in the intake stroke or expansion stroke, but the quantity of lubricating oil retention is equal in principle at the top and bottom dead center on different engine operating condition. When the engine is on the same load condition, as the engine rotational speed increasing, the quantity of retained lubricating oil is decreased in the whole intake stroke and the middle and later parts of expansion stroke, but the quantity of retained lubricating oil is increased in the front part of expansion stroke. When the engine is on the same rotational speed condition, the quantity of retained lubricating oil increases with the increasing engine load in the front part of expansion stroke, it does not vary with the engine load in principle in the middle and later part of expansion stroke, the variation that the quantity of retained lubricating oil varies with the engine load is dissimilar in the intake stroke on different engine rotational speed condition.

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Figures

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Fig. 1

Schematic diagram of the structure and load of piston

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Fig. 4

Eccentricity of piston at the top of piston skirt on different engine operating conditions: (a) 0% load, (b) 60% load, and (c) 100% load

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Fig. 5

Eccentricity of piston at the bottom of piston skirt on different engine operating conditions: (a) 0% load, (b) 60% load, and (c) 100% load

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Fig. 2

Schematic diagram of the lubricating oil retained on the surface of cylinder liner

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Fig. 3

Indicator diagram on different engine operating conditions: (a) 1200 r/min, (b) 2200 r/min, and (c) 3200 r/min

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Fig. 6

Minimum oil film thickness of piston skirt on different engine operating conditions: (a) 0% load, (b) 60% load, and (c) 100% load

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Fig. 7

Maximum oil film pressure of piston skirt on different engine operating conditions: (a) 0% load, (b) 60% load, and (c) 100% load

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Fig. 8

Quantity of retained lubricating oil in intake stroke on different engine operating conditions: (a) 0% load, (b) 60% load, and (c) 100% load

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Fig. 9

Quantity of retained lubricating oil in expansion stroke on different engine operating conditions: (a) 0% load, (b) 60% load, and (c) 100% load

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