Transient elastohydrodynamic lubrication analysis of spur gears running-in considering effects of solid particles and surface roughness

Huang, Xingbao; Wang, Youqiang

doi:10.1108/ilt-05-2015-0061

Cited by 7 publications

(4 citation statements)

References 19 publications

(19 reference statements)

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“…Therefore, to satisfy the flow continuity, a higher local pressure will be generated. Similar behaviour was also shown by Punit and Niraj [19] and Huang and Wang [30]. It can also be shown that the film and pressure profile shape for the wavy surface case are almost the same as previously described for the smooth surface case at various time steps; the only difference is that the waviness is imposed on the film and pressure profiles.…”

Section: (B) and 4(b)supporting

confidence: 85%

“…The minimum film thickness decreases as the surface wavelength decreases. In fact, this is due to greater flow resistance at sharp asperities, see Punit and Niraj [19] and Huang and Wang [30]. journal.ump.edu.my/ijame ◄ Figure 11 shows the characteristics of the lubricated conjunction presented by central and maximum pressure and central and minimum film thickness with time for various wavelength waviness ranging from 0.5 µm to 2.0 µm at an journal.ump.edu.my/ijame ◄ amplitude waviness of 0.12 µm for a deceleration/acceleration period of 14 ms and an inactive period of 7 ms.…”

Section: (B) and 4(b)mentioning

confidence: 99%

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Transient Elastohydrodynamic Lubrication of Rough Contact Surface for Intermittent Motion

Al-Samieh

2022

Int. J. Automot. Mech. Eng.

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The current study aims to study the characteristics of transient elastohydrodynamic lubrication of smooth and rough surface contacts subjected to intermittent motion for different inactive periods of motion and deceleration/acceleration periods to fulfill an identified need for such conjunction. In this case, the non-steady Reynolds’ equation, the film thickness equation with elastic deformation and taking into account the influence of surface roughness, and the load balance equation are simultaneously solved using the Newton-Raphson with Gauss-Seidel iterations method to determine the film profile and pressure distribution at various time steps. Surface contact of sinusoidal waves is presented with different amplitudes and wavelengths. The results indicated that surface waviness causes random oscillations in pressure and film profiles at different time steps. The greater the amplitude of the waviness, the more pressure and film profile variations occur. The magnitude of the pressure and film profile fluctuations becomes little noticeable as the wavelength of a wavy surface rises. The findings of this investigation also revealed that increasing the inactive duration for wavy surfaces results in zero minimum film thickness and surface contact. Squeezing action is ineffective in conveying loading capacity in this circumstance. The central and maximum pressure heights increase during the stop time interval as stop time increases. The centre film thickness increases at the end of the deceleration phase when the deceleration/acceleration period is reduced, but the minimum film thickness is unaffected. In fact, the minimum film thickness tends to be zero at the end of the deceleration phase, regardless of the deceleration/acceleration period. The central and maximum pressure increase during the stop time interval with the decrease of the deceleration/acceleration period. The difference between the results for smooth and wavy surface contacts is the appearance of fluctuations in film and pressure profiles, as well as the reduction of the film thickness and increase in pressure for the wavy surface when compared to contact with a smooth surface.

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Section: (B) and 4(b)supporting

confidence: 85%

Section: (B) and 4(b)mentioning

confidence: 99%

Transient Elastohydrodynamic Lubrication of Rough Contact Surface for Intermittent Motion

Al-Samieh

2022

Int. J. Automot. Mech. Eng.

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“…Beilicke et al 22 investigated the thermal EHL of a diamond-like carbon (DLC) coated helical gear using the limiting shear stress lubricant. Huang and Wang 23 studied the effect of solid particles in lubricant on the lubrication performance of spur gear running-in process. Ziegltrum et al 24 compared the influence of different lubricants on the load-dependent spur gear losses using the thermal EHL model.…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of a helical gear pair considering interfacial slip between lubricant and tooth surface

Liu

Deng

Zhou

et al. 2022

Lubrication Science

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In this study, an interfacial slip model including the limiting shear stress is proposed and applied to the thermal elastohydrodynamic lubrication (EHL) analysis of a helical gear pair. The main difference between the proposed model and the classical EHL model is that, the term of entrainment velocity in Reynolds equation is modified. The influences of interfacial slip, thermal effect, initial limiting shear stress and operating conditions on the tribological properties are evaluated. Due to the interfacial slip, the pressure distribution moves towards the inlet region, and the fluctuation distributions of entrainment velocity and film thickness are similar to the trigonometric function. The influence of thermal effect on interfacial slip cannot be ignored, especially in the case of high speed and heavy load. As the input torque and input rotational speed increase, the interfacial slip gradually extends to the whole meshing process.

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“…A considerable number of research effort has been devoted to the EHL analysis of gears, most of which are about spur gears 1–4 . In recent years, Huang et al 5 has studied the full numerical solution of the time‐varying non‐Newtonian thermal EHL under the impact of the actual gear meshing. Zhou et al 6 studied the effect of viscosity, rheological behaviour and synthetic radius of curvature on the film stiffness of spur gears under EHL.…”

Section: Introductionmentioning

confidence: 99%

Effect of reversing duration time and commutation meshing state on the elastohydrodynamic lubrication of reciprocating spur gear rack

Zhao

Liu

Wang

2022

Lubrication Science

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Reciprocating spur gear rack is prone to lubrication failure near the reversing dead center position. Ree‐Eyring lubrication fluid, multigrid method and multigrid integral method were used to calculate the pressure profile, film thickness and oil temperature rise. Compared with linear motion, the process of reciprocating commutative movement is more complicated and the lubrication state are more unstable. The effects of different reversing duration time and commutation meshing state on lubricant film were analysed. The results show that, the oil thickness during the gear reversing process is significantly reduced. While shortening the reversing time can improve the lubricating film thickness, it causes the instantaneous oil temperature to rise. Therefore, the gear tooth damage caused by high temperature can be avoided by prolonging the reversing duration time properly. The longer the reversing duration time, the minimum value of central film thickness and central pressure is closer to the meshing outlet area. No matter what the reversing time change, the minimum lubrication film thickness is in the reversing dead center position. So the reversing dead center is still the dangerous point for the lubrication failure of the spur gear rack mechanism. When the reversing dead center is in the leading tooth of double‐tooth meshing, the gear has the largest film thickness and the largest contact area. In addition, the synthetic radius of curvature and entrainment velocity become larger so the lubrication conditions have been improved. The results provide the theoretical basis and guidance for the reasonable design of the spur gear rack and the improvement of its lubricating performance.

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Transient elastohydrodynamic lubrication analysis of spur gears running-in considering effects of solid particles and surface roughness

Cited by 7 publications

References 19 publications

Transient Elastohydrodynamic Lubrication of Rough Contact Surface for Intermittent Motion

Transient Elastohydrodynamic Lubrication of Rough Contact Surface for Intermittent Motion

Tribological properties of a helical gear pair considering interfacial slip between lubricant and tooth surface

Effect of reversing duration time and commutation meshing state on the elastohydrodynamic lubrication of reciprocating spur gear rack

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