Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
FEASIBILITY ANALYSIS OF QUANTITATIVE THERMOGRAPHY FOR FAILURES AND THE LACK OF LUBRICATION DETECTION IN CYLINDRICAL SPUR GEARS
Submission Author:
João Manoel de Oliveira Neto , PB , Brazil
Co-Authors:
João Manoel de Oliveira Neto, Juscelino Maribondo, Wanderley Amorim Júnior
Presenter: João Manoel de Oliveira Neto
doi://10.26678/ABCM.COBEM2021.COB2021-1199
Abstract
Gear failures generally result from contact fatigue caused by cyclical stresses originated by tooth contact. Additionally, the lack of gear lubrication increases the temperature of the arrangement, which may cause gear failure. In this framework, this paper aims to verify the feasibility of using quantitative thermography in its active and passive modes to analyze these anomalies. The experiments were performed in a controlled environment to detect the lack of lubrication and faults in the pinion teeth surfaces of a spur gear transmission. Although thermography detected the lack of lubrication, our data indicate that this technique was not able to detect pinion defects This work reveals that quantitative thermography is not efficient in identifying small flaws in the teeth surfaces of cylindrical spur gears. Although the temperature gradient associated with the lubricated and non-lubricated pinion was obtained, it was not expressive enough to distinguish the difference between a small flaw and an environmental temperature change (operation of a heat-generating source, such as an oven) or instabilities in the mechanical system (misalignments, imbalances, and clearances). We conclude that thermography is not a practical technique to determine the deficiency of the system's lubrication.
Keywords
Active Thermography, passive thermography, Spur Gears, tooth flaws, lubrication
