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Friction

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Response of grease film at low speeds under pure rolling reciprocating motion

  • Yiming Han
  • Jing WangEmail author
  • Shanshan Wang
  • Qian Zou
  • Gary Barber
Open Access
Research Article
  • 35 Downloads

Abstract

Using an optical interferometric technique, the grease film distribution under a pure rolling reciprocating motion is observed on a ball-disk test rig, to explore the transient response of grease, which is expected to fill the contact with thickener fiber and run for a long time under steady-state conditions. It is found that the reciprocating motion reduces the accumulation of the thickener fiber gradually with time. The maximum film thickness forms around the stroke ends. After 1,000 working cycles, very severe starvation occurs so that either the central or minimum film thickness becomes nearly constant over one working period. Thus, the life of grease lubrication under a transient condition is far below that under steady-state conditions. However, it is also found that by selecting a smaller stroke length, the thickener fiber spreads out in the contact instead of being removed from the contact at the 1,000th working period. When increasing the maximum entraining speed of the reciprocating motion to a certain value, during which the thickener fiber is not expected to accumulate under a steady-state condition, severe starvation occurs very quickly, causing surface damage.

Keywords

grease lubrication reciprocation pure rolling grease starvation thickener fiber 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China through grants No. 51875298 and No. 51275253.

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Copyright information

© The author(s) 2018

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Yiming Han
    • 1
  • Jing Wang
    • 1
    Email author
  • Shanshan Wang
    • 1
  • Qian Zou
    • 2
  • Gary Barber
    • 2
  1. 1.School of Mechanical and Automotive EngineeringQingdao University of TechnologyQingdaoChina
  2. 2.School of Engineering and Computer ScienceOakland UniversityRochesterUSA

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