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Research Papers: Hydrodynamic Lubrication

Research on the Profile Design of Surface Texture in Piston Ring of Internal Combustion Engine

[+] Author and Article Information
Yin Bifeng

Professor
School of Automobile and Traffic Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: ybf@ujs.edu.cn

Gao Dashu

School of Automobile and Traffic Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: kudoai@foxmail.com

Sun Shao

School of Automobile and Traffic Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: suns1960@163.com

Xu Bo

School of Automobile and Traffic Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: xuboujs@foxmail.com

Jia Hekun

School of Automobile and Traffic Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: human_cm@126.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 14, 2017; final manuscript received April 7, 2018; published online May 7, 2018. Assoc. Editor: Joichi Sugimura.

J. Tribol 140(6), 061701 (May 07, 2018) (9 pages) Paper No: TRIB-17-1230; doi: 10.1115/1.4039957 History: Received June 14, 2017; Revised April 07, 2018

In this paper, a profile design of surface texture was applied for improving the tribological performance of piston ring–cylinder pair. The design of texture pattern was implemented by numerous textures of different depths in sliding speed direction to imitate the outline of barrel-shaped ring. The thickness and pressure distribution of oil film were obtained through a joint solution of modified Reynolds equation and other governing equations for textured surface. The results indicate that the novel texture pattern has the best overall performance in oil film thickness and friction force compared with normal surface textures, and the average friction power is 10.04% and 16.85% less than normal surface textures and barrel-shaped ring in the whole working cycle. Extra microhydrodynamic lubrication can be observed in the middle region of textured piston ring through the pressure distribution of oil film. At last, the experiment was conducted in a motored test rig and exhibited up to 3% reduction in friction power.

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Figures

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Fig. 4

Diagram of radial direction force balance for piston ring

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Fig. 3

Schematic diagram of different schemes on the piston ring: (a) the normal texturing scheme, (b) the novel texturing scheme, and (c) the barrel-shaped ring scheme

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Fig. 2

Schematic diagram of dimple geometry on the piston ring: (a) dimples array extended on the piston ring and (b) cross section of ring–liner part

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Fig. 1

Schematic diagram of the novel texture pattern

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Fig. 5

The gas pressure variations with crank angle

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Fig. 6

The minimum oil film thickness ratio of different schemes for the whole working cycle

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Fig. 7

The minimum oil film thickness ratio of different schemes near TDC

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Fig. 8

The dimensionless friction force of different schemes for the whole working cycle

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Fig. 9

The dimensionless asperity friction force of different schemes near TDC

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Fig. 13

A picture of the engine on the test bench

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Fig. 14

The appearance of textured piston ring: (a) normal texturing scheme and (b) novel texturing scheme

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Fig. 15

The increase rate of friction power compared with the barrel-shaped ring of original machine

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Fig. 10

The average friction power for different schemes

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Fig. 11

The 3D pressure distribution of oil film for different schemes at −270 °CA: (a) the normal texturing scheme hp = 2 μm, (b) the normal texturing scheme hp = 10 μm, (c) the novel texturing scheme, and (d) the barrel-shaped ring scheme

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Fig. 12

The 3D pressure distribution of oil film for different schemes near TDC (10 °CA): (a) the normal texturing scheme hp = 2 μm, (b) the normal texturing scheme hp = 10 μm, (c) the novel texturing scheme, and (d) the barrel-shaped ring scheme

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