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Research Papers: Elastohydrodynamic Lubrication

Parametric Studies of Mechanical Power Loss for Helical Gear Pair Using a Thermal Elastohydrodynamic Lubrication Model

[+] Author and Article Information
Mingyong Liu

Hubei Agricultural Machinery Engineering
Research and Design Institute,
Hubei University of Technology,
Wuhan 430068, China
e-mail: lmy8508@hbut.edu.cn

Peidong Xu

Hubei Agricultural Machinery Engineering
Research and Design Institute,
Hubei University of Technology,
Wuhan 430068, China
e-mail: 463176132@qq.com

Chunai Yan

Dongfeng Passenger Vehicle Company,
Wuhan 430058, China
e-mail: 664874648@qq.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 17, 2018; final manuscript received June 21, 2018; published online August 20, 2018. Assoc. Editor: Yi Zhu.

J. Tribol 141(1), 011502 (Aug 20, 2018) (14 pages) Paper No: TRIB-18-1024; doi: 10.1115/1.4040723 History: Received January 17, 2018; Revised June 21, 2018

In this study, a comprehensive mechanical efficiency model based on the thermal elastohydrodynamic lubrication (TEHL) is developed for a helical gear pair. The tribological performance of the helical gear pair is evaluated in terms of the average film thickness, friction coefficient, mechanical power loss, mechanical efficiency, etc. The influence of basic design parameters, working conditions, thermal effect, and surface roughness are studied under various transmission ratios. Results show that the contribution of thermal effect on the tribological performance is remarkable. Meanwhile, the rolling power loss constitutes an important portion of the total mechanical power loss, especially around the meshing position where the pitch point is located in the middle of contact line and the full elastohydrodynamic lubrication (EHL) state with the friction coefficient less than 0.005. The proper increase of normal pressure angle and number of tooth can improve the tribological performance. The influence of helix angle on the mechanical efficiency is less significant. A positive addendum modification coefficient for pinion and a negative addendum modification coefficient for wheel are good for improving the mechanical efficiency. The results provide the tribological guidance for design of a helical gear pair in engineering.

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References

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Figures

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Fig. 1

A pair of meshing helical gear pair

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Fig. 2

The variation of contact line for helical gear pair along the LOA

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Fig. 3

The variation of geometrical and kinematic parameters for helical gears in Ref. [3]

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Fig. 4

The measured surface roughness profile in RMS = 0.1002 μm

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Fig. 5

Comparison EHL results between current study and Xu's results [3]

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Fig. 6

Variation of average film thickness, friction coefficient, and geometrical and kinematic parameters for three typical transmission ratios (tr = 0.5, tr = 1.0, and tr = 1.5)

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Fig. 7

Variation of the traction force, mechanical power loss along the tooth surface for three typical transmission ratios (tr = 0.5, tr = 1.0, and tr = 1.5)

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Fig. 8

Time varying contact line of helical gear pair with transmission ratio tr = 1.0

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Fig. 9

Distribution of pressure, film thickness, oil film temperature, and shear stress for transmission ratio tr = 1.0 at meshing position P

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Fig. 10

Effect of working conditions on the lubrication performance and mechanical power loss along the LOA

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Fig. 11

Influence of normal pressure angle on the lubrication performance and mechanical power loss under several transmission ratios

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Fig. 12

Influence of helix angle on the lubrication performance and mechanical power loss under several transmission ratios

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Fig. 13

Influence of normal module on the lubrication performance and mechanical power loss under several transmission ratios

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Fig. 14

Influence of addendum modification on the lubrication performance and mechanical power loss under several transmission ratios

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Fig. 15

Effect of surface roughness on the average film thickness, friction coefficient and traction force along the LOA with the transmission ratio tr = 1.0

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Fig. 16

Effect of surface roughness on the mechanical power loss and mechanical efficiency along the LOA with the transmission ratio tr = 1.0

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