Power loss in FZG gears: Mineral oil vs. biodegradable ester and carburized steel vs. austempered ductile iron vs. MoS2-Ti coated steel

• Type: Article in International Conference Proceedings Book
• Date: 2005

Authors

Martins, RC (Author) Other; Moura, PS (Author) Other; Seabra, JO (Author) FEUP

Conference proceedings International

Title: International Conference on Gears, Pts 1 and 2: EUROPE INVITES THE WORLD

Pages: 1467-1486

International Conference on Gears

Garching, GERMANY, SEP 14-16, 2005

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 14 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-000-5YB

Abstract (EN): The aim of this work is the assessment of the energetic behavior in gear applications of two industrial gear oils when combined with three different gear materials: Garburized steel, austempered ductile iron (ADI) and MoS2/Ti coated steel. Two lubricants, a reference paraffinic mineral oil with an additive package for extra protection against micropitting and a biodegradable non-toxic saturated ester, are selected and characterized in terms of their physical properties. Power loss gear tests are performed on the FZG test rig using type C gears, for wide ranges of applied torque and input speed, in order to compare the energetic performance of all lubricant/material combinations. Lubricant samples, collected during and at the end of the gear tests, are analyzed by Direct Reading Ferrography (DR3) and the evolution of wear particles indexes during the tests is assessed. Weigh loss measurements are also performed. An energetic model of the FZG test gearbox integrating the mechanisms of power dissipation and heat evacuation is used, allowing the determination of its operating equilibrium temperature. The XL parameter, in the average friction coefficient equation proposed by Hohn et al.[1], is determined for each lubricant - material combination, using an optimization routine that correlates experimental and model results. The influence of lubricants and material / surface coating combinations on the friction coefficient between the gear teeth is discussed taking into consideration the operating conditions (torque, speed and temperature).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 20