Thermal Elastohydrodynamic Analysis of a Worm Gear

This study explores the elastohydrodynamic lubrication (EHL) between the contacting tooth flanks of a worm gear with nonconjugate meshing action. The contact is characterized by a slender-like elliptical shape and high sliding. The geometry and contact conditions for the considered worm gear were ob...

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Bibliographic Details
Published in:Machines (Basel) 2023-01, Vol.11 (1), p.89
Main Authors: Tošić, Marko, Larsson, Roland, Stahl, Karsten, Lohner, Thomas
Format: Article
Language:English
Subjects:
Design factors
elastohydrodynamic lubrication (EHL)
Entrainment
Film thickness
finite element method (FEM)
Flanks
Gear teeth
Geometry
Heat
Kinematics
Lubricants & lubrication
Machine Elements
Maskinelement
Reynolds equation
slender contact
Velocity
worm gear
Worm gears
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Summary:This study explores the elastohydrodynamic lubrication (EHL) between the contacting tooth flanks of a worm gear with nonconjugate meshing action. The contact is characterized by a slender-like elliptical shape and high sliding. The geometry and contact conditions for the considered worm gear were obtained using tooth contact analysis. Based on that, the complete area of the worm gear contact was analyzed using a validated numerical EHL model considering non-Newtonian, thermal, and transient effects. The geometrical and kinematic design factors that influence EHL film formation in worm gears were identified and discussed. The results show the specific characteristics of worm gear EHL contacts, such as the very slender contact in the tooth root flank area, which diminishes the effect of the entrainment speed on film thickness. EHL film formation could be supported by increasing conformity between the flanks to make the contact less slender. By comparing the film thickness results against analytically obtained ones, relatively large differences were observed except for one formula for minimum film thickness.
ISSN:2075-1702
2075-1702
DOI:10.3390/machines11010089