Starved lubrication of a spur gear pair

Liu, Huaiju; Zhu, Caichao; Sun, Zhangdong; Song, Chaosheng

doi:10.1016/j.triboint.2015.07.030

Cited by 69 publications

(41 citation statements)

References 19 publications

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“…The contact analysis of coated gear pairs would be even more difficult when considering the complicated gear kinematics and tooth surface roughness. Liu et al [12,13], Li et al [14,15], and Evans et al [16,17] have studied gear tribology problems without the consideration of coating. Liu et al [18] provided a discrete convolute, fast Fourier transform (DC-FFT) method for fast calculation of the surface deformation and subsurface stress components.…”

Section: Introductionmentioning

confidence: 99%

Tribological behavior of coated spur gear pairs with tooth surface roughness

Liu

Zhu

et al. 2018

Friction

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Abstract:Coating is an effective way to reduce friction and wear and to improve the contact-fatigue lives of gear components, which further guarantees a longer service life and better reliability of industrial machinery. The fact that the influence coefficient linking the tractions and stress components could not be expressed explicitly increases the difficulty of coated solids contact analysis. The complicated tribological behavior between tooth surfaces influenced by lubrication and surface roughness further adds difficulty to the coated gear pair contact problems. A numerical elastohydrodynamic lubricated (EHL) contact model of a coated gear pair is proposed by considering the coupled effects of gear kinematics, coating properties, lubrication, and surface roughness. The frequency response function and the discrete convolute, fast Fourier transformation (DC-FFT) method are combined to calculate the surface deformation and the subsurface stress fields at each meshing position along the line of action (LOA). The Ree-Eyring fluid is assumed to incorporate the non-Newtonian effect, which is represented in the generalized Reynolds equation. Influences of the ratio between the Young's modulus of the coating and the substrate on the contact performance, such as pressure, film thickness, tooth friction coefficient, and subsurface stress field, are studied. The effect of the root mean square (RMS) value of the tooth surface roughness is studied by introducing the roughness data, deterministically measured by an optical profiler.

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Section: Introductionmentioning

confidence: 99%

Tribological behavior of coated spur gear pairs with tooth surface roughness

Liu

Zhu

et al. 2018

Friction

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“…In fact, the starved condition may happen during the railway operation condition. The EHL analysis of the starved problems had been successfully solved by many researchers without considering surface roughness . In this model, in order to consider the effect of starvation, a modification on Reynolds equation by introducing the fractional film content θ to the wedge form is applied based on the work presented by Jakobsson and Floberg and Olsson who introduced the concept of fractional film content.…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical investigation on the high‐speed wheel/rail adhesion under the starved interfacial contaminations with surface roughness

2020

Lubrication Science

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This paper presents a new numerical model of wheel/rail in rolling contact to study the adhesion mechanism under the starved interfacial contaminations at high speed considering surface roughness. A thermal starved mixed elastohydrodynamic lubrication (EHL) theory is hired in the model. The empirical equations for analysing the contact force of rough surfaces that are based on amount of accurate finite element analysis (FEA) of an elastic‐plastic single‐asperity contact over a rigid flat are proposed. Multilevel method is used to solve the modified Reynolds equations, and sweeping column method is used to solve energy and heat conduction equations. The pressure field, the fractional film content, and the temperature field are obtained through the present model. In addition, the influences of train speed, surface roughness amplitudes, and inlet film thickness on the adhesion coefficient are investigated. The results from the present model have been compared with those from flooded analyses for water and oil‐contamination cases. The numerical results show that the inlet film thickness and the train speed had a significant effect on the wheel/rail adhesion ability.

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“…Beilicke et al examined the influence of diamond‐like carbon (DLC) coatings on tribological behaviour for helical gear using the transient thermal EHL model. Liu et al proposed a thermal starved EHL model of a spur gear pair and discussed the effects of inlet‐supply oil and working conditions on the lubrication performance. Ouyang et al conducted a finite line contact tribo‐dynamic model of spur gear pair.…”

Section: Introductionmentioning

confidence: 99%

Thermal elastohydrodynamic lubrication analysis of helical gear pair under starved lubrication condition

Liu

Zhang

et al. 2019

Lubrication Science

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In the present study, thermal starved elastohydrodynamic lubrication (EHL) model is developed for a helical gear pair. The influences of inlet oil‐supply layer, input speed, lubricant viscosity, and surface roughness on the lubrication behaviour are investigated. The minimum film thickness, temperature rise of teeth surfaces and oil film, and the friction coefficient are predicted along the line of action (LOA). Results show that the effects of inlet oil‐supply layer, input speed, and lubrication viscosity on the tribological performance are remarkable. Under the starved lubrication, the influence of inlet oil supply on the temperature rise is insignificant. Meanwhile, the effect of surface roughness has been discussed. It reveals that the roughness texture along the entrainment velocity direction has significant influence on the lubrication characteristics. The results provide the tribological guidance for design of a helical gear pair in engineering.

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Starved lubrication of a spur gear pair

Cited by 69 publications

References 19 publications

Tribological behavior of coated spur gear pairs with tooth surface roughness

Tribological behavior of coated spur gear pairs with tooth surface roughness

Numerical investigation on the high‐speed wheel/rail adhesion under the starved interfacial contaminations with surface roughness

Thermal elastohydrodynamic lubrication analysis of helical gear pair under starved lubrication condition

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