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Research Papers: Hydrodynamic Lubrication

Influence of Skirt Profile Structure of Gasoline Engine Piston on the Friction and Wear Characteristics Under Standard Conditions

[+] Author and Article Information
Jian Zhang

College of Electromechanical Engineering,
Binzhou University,
Binzhou 256600, Shandong, China
e-mail: zhangjian3829@163.com

Zhongyu Piao

College of Mechanical Engineering,
Zhejiang University of Technology,
Hangzhou 310012, Zhejiang, China
e-mail: piaozy@zjut.edu.cn

Shiying Liu

Shandong Binzhou Bohai Piston Co., Ltd.,
Binzhou 256600, Shandong, China
e-mail: lsy_bz@163.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 1, 2017; final manuscript received July 16, 2017; published online September 29, 2017. Assoc. Editor: Joichi Sugimura.

J. Tribol 140(2), 021703 (Sep 29, 2017) (11 pages) Paper No: TRIB-17-1164; doi: 10.1115/1.4037360 History: Received May 01, 2017; Revised July 16, 2017

Different profile structures were designed for a high-power engine piston, and engine tests were carried out to analyze and compare the influences of the widest point position and contraction rate on the skirt wear property. The results show that the lower position of the widest point will cause poor guidance, and at the same time the rapid radial reduction in both the upper and lower parts will increase the swing angles and the kinetic energy; the uniformity of wear loads can be improved effectively by increasing the height of the widest point and the width of the maximum diameter region; the degree of wear of the skirt can be considered through a comparison of the outer diameter variation.

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References

Figures

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Fig. 1

Profile structures of piston: (a) profile schemes and (b) skirt geometry

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Fig. 2

The micromorphology and composition of the skirt surface coating: (a) surface coating, (b) micromorphology, and (c) composition analysis

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Fig. 3

Morphology and thickness of skirt section: (a) cross section morphology and (b) local magnification

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Fig. 4

The roughness of the skirt surface with coatings

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Fig. 5

The structural curve of cylinder: (a) cylinder 1 view 0–180 deg and (b) cylinder 1 view 90–270 deg

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Fig. 7

Flowchart of the software simulation

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Fig. 9

The developer crack detection results

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Fig. 10

Wear morphology of the skirt on the thrust side: (a) profile 1: cylinder 1, (b) profile 1: cylinder 2, (c) profile 2: cylinder 1, (d) profile 2: cylinder 2, (e) profile 3: cylinder 1, and (f) profile 3: cylinder 2

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Fig. 11

Lateral traces on the cylinder surface: (a) cylinder 1 and (b) cylinder 4

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Fig. 12

The roughness of the cylinder surface after test

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Fig. 13

Micromorphology of the main area wear of profile 1: (a) outer surface and (b) cross section

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Fig. 14

Micromorphology of the main wear area of profile 2: (a) outer surface and (b) cross section

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Fig. 15

Micromorphology of the main wear area of profile 3: (a) outer surface and (b) cross section

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Fig. 16

The micromorphology and composition of the transverse wear part on cylinder surface: (a) micromorphology and (b) composition analysis

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Fig. 17

The micromorphology and composition of the normal wear part on cylinder surface: (a) micromorphology and (b) composition analysis

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Fig. 18

Structure and variation of the profile on the thrust side: (a) profile 1, (b) profile 2, and (c) profile 3

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Fig. 19

Wear morphology comparison on the thrust side: (a) ruler, (b) profile 1, (c) profile 2, and (d) profile 3

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Fig. 20

Comparison of the swing angle

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Fig. 21

Comparison of kinetic energy: (a) the whole process and (b) expansion stroke

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Fig. 22

Comparison of maximum pressures of the piston skirt

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Fig. 23

Friction loss comparison of piston skirt

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