Experimental simulation of gear contact along the line of action

Kleemola, Jaakko; Lehtovaara, Arto

doi:10.1016/j.triboint.2009.06.007

Cited by 35 publications

(30 citation statements)

References 17 publications

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“…Here, the film thickness trend is shown as an indicative reference for steady-state conditions to screen the effect of the main operating parameters (load, velocity, and temperature) and transient behaviour in lubrication condition. In a previous study [5], gear contact was simulated along the line of action at discrete, steady state, with contacts using a twin-disc test device, where contact resistance measurements were recorded. The results showed that the trends of the calculated thermal -values along the line of action correspond well with the measured mean contact resistance.…”

Section: Resultsmentioning

confidence: 99%

“…Film thickness, which protects the gear from failure such as wear, scuffing, micropitting, and pitting, is strongly dependent on oil and surface temperatures in the gear contact inlet zone [4,5]. Studies have been made to calculate [6,7] and measure [8,9] gear (surface) temperatures; however, the surface temperature of an instantaneous contact point is very difficult to estimate either theoretically or experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…These sensors have a definite value in contact research, even though they require considerable effort for their manufacture and calibration together with the fact that they have a limited lifetime [10] and pressure level. The (electrical) contact resistance measurements have been used in many different kinds of test devices [1,5,[11][12][13][14][15][16] to measure relative changes of film thickness in lubricated contacts. Kleemola and Lehtovaara [5] simulated gear contacts along the line of action using a twin-disc test device, where contact resistance measurements were recorded.…”

Section: Introductionmentioning

confidence: 99%

“…The (electrical) contact resistance measurements have been used in many different kinds of test devices [1,5,[11][12][13][14][15][16] to measure relative changes of film thickness in lubricated contacts. Kleemola and Lehtovaara [5] simulated gear contacts along the line of action using a twin-disc test device, where contact resistance measurements were recorded. It was concluded that the trends of calculated thermal -values of real gears correspond well with the measured mean contact resistance.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of lubrication conditions in gear contacts using contact resistance and bulk temperature measurements

Kleemola

Lehtovaara

2010

Proceedings of the Institution of Mechanical Engineers, Part J:

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Lubrication conditions have a major effect on lifetime and friction in gear contacts. Monitoring of relative changes in protecting film thickness provides an opportunity to understand the operating conditions before an initial fault appears. In this study, the lubrication conditions were detected on-line using contact resistance and bulk temperature measurements, which were applied to a modified FZG gear test device. Measurements were made with polished gear surfaces at operating conditions that are typical of industrial gears. The presented mean contact resistance includes the data points in different positions along the line of action and thus also considers transient effects. The bulk temperature and trend curves of the mean contact resistance at different pitch line velocities, loads, and oil inlet temperatures are reported and discussed as measures for analysing the lubrication condition.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of lubrication conditions in gear contacts using contact resistance and bulk temperature measurements

Kleemola

Lehtovaara

2010

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The micropitting may be exacerbated by the use of different types of anti-wear additives. Kleemola and Lehtovaara [15] developed a twin-disc test device to investigate the effects of three parameters, friction coefficient, temperature and lubrication conditions, on micropitting. Their results showed that higher sliding led to a higher temperature increase and lower film thickness.…”

Section: Review Of Recent Micropitting Researchmentioning

confidence: 99%

Experimental and analytical study of gear micropitting initiation and propagation under varying loading conditions

Al-Tubi

Long

Zhang³

et al. 2015

Wear

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Micropitting damage is one of the failure modes commonly observed in gears leading to destructive failures, which in turn results in unplanned shutdown and expensive replacement, such as those observed in wind turbine gearboxes. This study investigates gear micropitting initiation and propagation when subjected to varying torque loads under a constant rotational speed. The study employs both experimental gear testing and analytical evaluation based on the ISO Technical Report of Gear Micropitting, ISO/TR 15144-1:2010 and the recently revised ISO/TR 15144-1:2014. Initiation and propagation of micropitting are assessed in testing by quantifying the development of micropits and their progressive rate after specific numbers of running cycles at step-up torque levels. The analytical study is conducted to validate the prediction of micropitting using the ISO/TR recommended procedures by comparing the results with the occurrence of micropits in the tested gears.The gear test results show that micropitting initiates at the pinion dedendum but escalates at the addendum, because of the greater severity of progressive micropitting at the dedendum of the mating wheel where the tip relief area first comes into mesh. The analytical results, based on varying surface roughness measurements obtained from the tested gears, confirm that the maximum contact stresses and minimum specific lubricant film thicknesses occur in these regions. The specific lubricant film thickness varies considerably because of changes of surface roughness after gears are subjected to various running cycles under varying torque levels. It has found that the excessive loading, gear tooth micro-geometry, surface roughness and lubricant film thickness are the main factors affecting micropitting.

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Evaluation of the Effect of Friction in Gear Contact Stresses

Patil

Karuppanan

2020

Tribology in Materials and Applications

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Experimental simulation of gear contact along the line of action

Cited by 35 publications

References 17 publications

Evaluation of lubrication conditions in gear contacts using contact resistance and bulk temperature measurements

Evaluation of lubrication conditions in gear contacts using contact resistance and bulk temperature measurements

Experimental and analytical study of gear micropitting initiation and propagation under varying loading conditions

Evaluation of the Effect of Friction in Gear Contact Stresses

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