Measurement of Oil Film Thickness Between W-N Helical Gear Tooth Profiles Using Laser Transmission Method

[+] Author and Article Information
Yang Ji-Bin

National Tribology Laboratory, Tsinghua University, Beijing 100084, People’s Republic of China

Qi Yu-Lin, Chen Chen-Wen

Department of Mechanical Engineering Harbin Institute of Technology, Harbin 150006, People’s Republic of China

J. Tribol 112(4), 708-711 (Oct 01, 1990) (4 pages) doi:10.1115/1.2920319 History: Received May 24, 1989; Revised December 04, 1989; Online June 05, 2008


In this experiment, it was the first time that the center oil film thickness between W-N helical gear tooth profiles has been measured indirectly through measuring the change of gaps of a pair of unloaded involute spur gears mounted on the extended shafts of W-N gear box by means of laser transmission method. During the measurement of every time, it was calibrated separately, so that all errors could be eliminated completely except ones of measuring apparatus. The accuracy of this method has reached 0.1 μm (dynamic) and 0.01 μm (static), respectively. Measurement results were identical with theoretical ones. This method is also suitable for the measurement of center oil film thickness between tooth profiles and deformation of any cylindrical spur and helical gears.

Copyright © 1990 by The American Society of Mechanical Engineers
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