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Title: Lubrication of thrust cones
Author: Barragan de Ling, Flor de Maria
Awarding Body: Cardiff University
Current Institution: Cardiff University
Date of Award: 1994
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This thesis presents the development of a computer model for the analysis of elastohydrodynamic lubrication (EHL) of thrust cones and the generation of a film thickness database to be used in a design package for crowned thrust cones. The term thrust cones refers to conical axial thrust components used with single helical gears. The geometry and kinematics are derived from first principles. The EHL model is based on finite-differences. A number of models are considered beginning with a rigid surface/isoviscous lubricant assumption and evolving in stages to a full isothermal, asymmetric EHL analysis with the inclusion of a thermal estimate. The results for perfectly conical thrust cones include a parametric variation of cone angle, variation of load and speed according to the propeller law, and variation of contact temperature. The results show that the lubricant film, although relatively thick in the central region of the contact, decreases severely at the transverse edges of the contact area for some of the conditions considered. A similar analysis of thrust cones having one crowned surface shows a significant improvement in predicted minimum oil film thickness. It is therefore proposed to adopt crowned thrust cones as a basis for a design method. A range of typical thrust cone operating conditions has been analysed and a total of 101 symmetrical, isothermal EHL results for circular and elliptical contacts have been obtained. These form the basis of a film thickness database for incorporation into a Thrust-Cone-Design-Aid-Package.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available