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QI Xiumei
GAO Chuangkuan
College of Mechanical Engineering, Taiyuan
University of Technology,
Taiyuan 030024, China
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EFFECT OF FRICTIONAL FORCE
ON GEARING CONTACT FATIGUE STRENGTH*
Abstract: The model for computing
frictional coefficient between two teeth faces at the state of
mixed elastohydrodynamic lubrication is established. And then
more than 80 sets of numerical calculations and six sets of disc
fatigue tests are completed. The results show that when the film
thickness ratio λ <1.6, frictional coefficient µ is drastically
decreased as λ rises; Thereafter it decreases smoothly until
λ=4.5. When λ>4.5, however, it goes up again with λ, which
indicates that the excessive film thickness ratio will
deteriorate gearing contact fatigue strength. At the end, the
formulae for determining the frictional coefficients are formed.
Key words:
Involute spur gear Contact fatigue strength Mixed
elastohydrodynamic lubrication
Frictional coefficient Fatigue tests
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