Contact and elastohydrodynamic analysis of worm gears, Part 1: Theoretical formulation

Sharif, Khairi, Kong, S., Evans, Henry Peredur ORCID: https://orcid.org/0000-0002-6989-0190 and Snidle, Raymond Walter ORCID: https://orcid.org/0000-0001-9333-7195 2001. Contact and elastohydrodynamic analysis of worm gears, Part 1: Theoretical formulation. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215 (7) , pp. 817-830. 10.1243/0954406011524171

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Abstract

The paper presents the theoretical basis for modelling the contact conditions and elastohydrodynamic lubrication (EHL) of worm gears, the results of which are presented in Part 2. The asymmetric elongated contact that typifies worm gears is non-Hertzian and is treated using a novel three-dimensional elastic contact simulation technique. The kinematic conditions at the EHL contact are such that the surfaces have a slide-roll ratio equal to almost 2, and the sliding direction varies over the contact area. These considerations require a non-Newtonian, thermal analysis, and the appropriate form of a novel Reynolds equation is developed that can incorporate any form of the non-Newtonian relationship between shear stress and strain rate. A form that incorporates both limiting shear stress and Eyring shear thinning is utilized in which the two effects can be included both singly or together.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TJ Mechanical engineering and machinery
Uncontrolled Keywords:	worm gears; elastohydrodynamic; thermal; non-Newtonian
ISSN:	0954-4062
Last Modified:	10 May 2023 00:55
URI:	https://orca.cardiff.ac.uk/id/eprint/2106

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