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research-article

Lubricant Selection for Minimum Traction in EHL Line Contacts During Accelerated Motion - A Numerical Approach

[+] Author and Article Information
Niraj Kumar

Department of Mechanical Engineering National Institute of Technology Kurukshetra Haryana, INDIA - 136119
niraj_me01336@yahoo.com

Punit Kumar

Department of Mechanical Engineering National Institute of Technology Kurukshetra Haryana, INDIA - 136119
punkum2002@yahoo.co.in

1Corresponding author.

ASME doi:10.1115/1.4036167 History: Received March 05, 2016; Revised January 06, 2017

Abstract

Transient thermal EHL line contact simulations are carried out to study the traction behavior during accelerated motion considering realistic shear-thinning and surface roughness effects. Using three lubricants with different inlet viscosity and shear-thinning parameters, the application of present analysis for lubricant selection is demonstrated. Owing to squeeze film action, the film evolution is delayed and start-up traction is found to increase much above the designed value. This effect increases with decreasing roughness wavelength especially at high amplitudes. The most shear-thinning test oil considered here yields the lowest traction coefficient with minimum variation in its value desirable for smooth and vibration-free operation.

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