Normal and tangential oil film stiffness of modified spur gear with non-Newtonian elastohydrodynamic lubrication

A new normal stiffness model of the oil film is established by the viscous-elastic fluid between a spur gear drive being equivalent to a massless spring element, and the tangential stiffness model is proposed according to the hypothesis of equal shear stress on laminar element surfaces. Effects of o...

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Bibliographic Details
Published in:Tribology international 2017-05, Vol.109, p.319-327
Main Authors: Zhou, Changjiang, Xiao, Zeliang, Chen, Siyu, Han, Xu
Format: Article
Language:English
Subjects:
Contact force
Contact pressure
Contact stresses
Curvature
Elastohydrodynamic lubrication
Finite element method
Lubrication
Mathematical models
Modified spur gear
Non-Newtonian EHL
Normal and tangential stiffness
Oil film
Parameter modification
Shear rate
Shear stress
Spur gears
Stiffness
Studies
Variation
Viscosity
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Summary:A new normal stiffness model of the oil film is established by the viscous-elastic fluid between a spur gear drive being equivalent to a massless spring element, and the tangential stiffness model is proposed according to the hypothesis of equal shear stress on laminar element surfaces. Effects of operating parameters (contact force and rotation speed) and geometry parameters (module, tooth number, pressure angle and modification) on the oil film stiffness from the root to the tip are investigated. The results show that the amplitude and fluctuation of the stiffness are closely related to the shear rate, effective viscosity and curvature radii. It is indicated that the rational parameter match is valid in mesh impact reduction and stationarity enhancement. •New normal and tangential models of the oil film between the mesh teeth are proposed.•Effects of various operating and geometry parameters on the oil film stiffness are investigated.•Amplitude and fluctuation of the stiffness are closely related to the shear rate, effective viscosity and curvature radii.•Rational parameter match is valid in mesh impact reduction and stationarity enhancement.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2016.12.045