Some aspects of gear tribology

Snidle, Raymond Walter; Evans, Henry Peredur

doi:10.1243/09544062jmes1168

Cited by 27 publications

(11 citation statements)

References 49 publications

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“…For example, the shape in the tooth root induces a triaxial mechanical loading. The tooth shape and its roughness modify the surface mechanical loading applied to the flank at the contact zone between the two teeth [5,6]. Some studies have been conducted based on real roughness profiles [7] taking into account the elastohydrodynamic behaviour where the influence of the sliding speed and viscosity is analysed, for example.…”

Section: Introductionmentioning

confidence: 99%

Microgeometrical influences on micropitting fatigue damage: multi-scale analysis

Fabre

Barrallier

Desvignes

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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Effective prediction methods are needed by engineers to design parts used in fatigue conditions. In gears, surface fatigue damage is observed at two scales: pitting and micropitting. These two phenomena occur in response to the variation of the local loading on the contact zone between teeth. The loading is influenced by the shape of the teeth and their surface roughness, which induces stress raisers. The pertinent geometrical parameters that determine fatigue lifetime need to be identified, and in this situation improved knowledge is still required. In the current study, seven parameters are used to define a generic tooth roughness profile. The transient mechanical loading acting on this rough tooth in rolling/sliding contact with a smooth tooth is obtained using elastohydrodynamic code. The stress time history is determined by integration so that pitting and micropitting can be predicted using the Crossland fatigue criterion. The analyses were applied to results obtained for 32CrMoV13 quenched and tempered steel for about 50 variations of the generic roughness profile parameters. It was found that pitting (at the position of the maximum Hertzian shear stress) is influenced by four of the parameters, the extent to which the von Mises equivalent stress exceeds the material yield stress in the zone where micropitting occurs is influenced by two parameters, and the fatigue lifetime is influenced by three parameters.

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Section: Introductionmentioning

confidence: 99%

Microgeometrical influences on micropitting fatigue damage: multi-scale analysis

Fabre

Barrallier

Desvignes

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…5, which reflects the incompressible case of the PAO6. Moreover, it can be seen that the influence of roughness mainly affects the zones close to the surface 11,39 …”

Section: Resultsmentioning

confidence: 99%

“…Moreover, it can be seen that the influence of roughness mainly affects the zones close to the surface. 11,39 If the rough and smooth results are compared, the differences can be clearly seen, not only in the change of shape of the distribution but also the stress levels have clearly increased, passing from (σ VM /p 0 ) max = 0.56 to (σ VM /p 0 ) max = 0.86 (at x/a = 0.11 and z/a = 0.05) for the rough case. When the influence on the stress field has been seen, we can then go on to apply the fatigue criteria.…”

Section: R E S U L T S a N D Discussionmentioning

confidence: 98%

Influence of the rheological behaviour of the lubricant on the appearance of pitting in elastohydrodynamic regime

Otero

Ochoa

Tanarro

et al. 2012

Fatigue Fract Eng Mat Struct

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This paper analyses the influence of lubricant behaviour on the appearance of pitting. It attempts to study the effect of viscosity–pressure relation, compressibility, film thickness–roughness relation and friction coefficient on pitting failure of the contacting elements. To explain these effects, we first deal with the influence of the oil on the lubrication of the contact using elastohydrodynamic theory and secondly two multiaxial fatigue criteria are used, Crossland criterion and Dang Van criterion, to evaluate the influence of the rheology on the appearance of pitting. Finally, different applications are presented together with a discussion on the results obtained.

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“…Some of the engine parts and assemblies which showed improved tribological performance after depositing DLC coatings include fuel injection system, 13,35,36 piston assembly, [37][38][39] bearings, 40,41 valve train assembly, [42][43][44][45][46][47][48] and gears. 49,50 Because of their biocompatibility and outstanding material properties such as high hardness, low friction, corrosion resistance, and moderate wear of counterbodies, DLC coatings found number of applications in the field of biomedical engineering. 51 An extensive research is going on to optimize DLC coatings for various biomedical applications such as orthopedic, cardiovascular and dental implants.…”

Section: Applications Of Dlc Coatingsmentioning

confidence: 99%

Influence of intrinsic and extrinsic conditions on the tribological characteristics of diamond-like carbon coatings: A review

et al. 2016

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Tribological performance of industrial applications involving boundary lubrication regime can be improved by depositing surface coatings such as diamond-like carbon (DLC) on the interacting surfaces. DLCs are considered as hard coatings with unique combination of properties which results in minimizing the friction induced energy and material losses especially under starved lubrication conditions. In spite of high wear-resistance and ultralow friction coefficients, there are a lot of factors that can directly influence the tribological characteristics of DLC coatings. Although, many studies were conducted to comprehend the effects of intrinsic/extrinsic conditions on tribological behavior of these coatings, still there is a lack of understanding due to contradictory remarks. Therefore, there is a need to rearrange the published data in an organized manner for logical continuation of research. In this paper, a brief introduction of DLC coatings is presented followed by detailed discussion on conditions that can directly influence their tribological properties.

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Some aspects of gear tribology

Cited by 27 publications

References 49 publications

Microgeometrical influences on micropitting fatigue damage: multi-scale analysis

Microgeometrical influences on micropitting fatigue damage: multi-scale analysis

Influence of the rheological behaviour of the lubricant on the appearance of pitting in elastohydrodynamic regime

Influence of intrinsic and extrinsic conditions on the tribological characteristics of diamond-like carbon coatings: A review

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