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Research Papers

Analysis of Lubricating Performance for Involute Gear Based on Dynamic Loading Theory

[+] Author and Article Information
Shi H. Yuan

e-mail: yuanshihua@bit.edu.cn

Hui L. Dong

e-mail: 10903078@bit.edu.cn

Xue Y. Li

e-mail: bitlxy@163.com
Science and Technology on Vehicle Transmission Laboratory, Beijing Institute of Technology,
Beijing 100081, China

1Contributed by the National Natural Science Foundation (51175038) for publication in the Journal of Mechanical Design.

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received April 16, 2012; final manuscript received September 24, 2012; published online October 26, 2012. Assoc. Editor: Qi Fan.

J. Mech. Des 134(12), 121004 (Nov 15, 2012) (9 pages) doi:10.1115/1.4007842 History: Received April 16, 2012; Revised September 24, 2012

An integrated model for gear pair that combines the dynamic load with the mixed elastohydrodynamic lubrication (EHL) theory is proposed in this paper covering the film squeeze effect as well as the friction force generated from the rough surfaces. Comparisons between the two models of load which are, respectively, based on minimum elastic potential energy (MEPE) criterion and dynamic motion equations built up in this paper are discussed. The results show that at low speed the loads calculated by the two models are similar. However, with increasing speed, the load exhibits dynamic characteristics gradually and reaches the highest value at resonant speed. Besides, the effects of the helix angle and the lubricant viscosity are also analyzed. Increasing the ambient viscosity could intensify the film stiffness and viscous damping. Gear with larger helix angle could weaken the impact phenomenon at the shift points where one tooth-pair disengages. Moreover, it is symmetric with regard to the pressure and film thickness across the face width for spur gear. Differently, the pressure for helical gear has a higher value at the dedendum of pinion where the film becomes thinner. In addition, speeding up the pinion would generally result in higher dynamic load and film pressure but thicker film thickness.

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References

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Figures

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Fig. 1

Dynamic model of a gear pair

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Fig. 2

Schematics of the meshing helical gear

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Fig. 3

Coordinate of lubrication models

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Fig. 4

Flowchart of computation program

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Fig. 5

Variation of dynamic load factor

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Fig. 6

The profile errors es(t)

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Fig. 7

Effect of lubricant ambient viscosity

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Fig. 8

Dynamic load and relative displacement

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Fig. 10

Variation of friction coefficient along LoA

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Fig. 9

Variation of load-sharing factors along LoA

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Fig. 11

Pressure distribution at pitch point

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Fig. 12

Pressure distribution and film shape along y-axis

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Fig. 13

Pressure and film thickness along LoA

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