Grease film evolution in rolling elastohydrodynamic lubrication contacts

Li, Xinming; Guo, Feng; Poll, Gerhard; Yang, Fei; Yang, Ping

doi:10.1007/s40544-020-0381-4

Cited by 29 publications

(19 citation statements)

References 49 publications

(94 reference statements)

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“…is approach was first pioneered by Tipei [33] for sliding contacts and recently employed for numerical predictions by Mohammadpour et al [34] and revealed good agreement with the measurements conducted by Johns-Rahnejat and Gohar [35]. Some references have studied the effect of starvation on oil film and its resulting fatigue in elastohydrodynamic contact [36,37]. Liu et al [38] studied the friction and wear behavior of laser textured surfaces in nonconformal contact under starved lubrication.…”

Section: Introductionmentioning

confidence: 93%

Effect of Lubricant Starvation on the Tribo-Dynamic Behavior of Linear Roller Guideway

Soleimanian

Mohammadpour

Ahmadian

2021

Shock and Vibration

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This paper presents an experimentally validated numerical approach linear roller guideways considering coupled vertical and horizontal (feed) motions and taking into account lubricant starvation. The inlet starvation is considered by incorporating potential flow method. Results show that starvation has pronounced effect on the lubricant film thickness, friction, and applied load on contact by up to 32%. Localised pressure values may vary by up to 100%. The severity of starvation effect is frequency dependent. It is also revealed that the starvation effect can be controlled by the amount of preload on linear guideway.

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Section: Introductionmentioning

confidence: 93%

Effect of Lubricant Starvation on the Tribo-Dynamic Behavior of Linear Roller Guideway

Soleimanian

Mohammadpour

Ahmadian

2021

Shock and Vibration

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“…With increasing operating times, the thickener in the contact is repeatedly overrolled by the rolling elements. This repeated mechanical working and the associated shear and thermal stress mechanically destroy the thickener on the raceway [36] and change significantly its rheological properties [37] like its viscosity. This process is irreversible due to the breakdown of the grease matrix and causes a viscosity loss of the lubricant in this part of the bearing.…”

Section: Lubrication In the Contactmentioning

confidence: 99%

Increase Service Life for Rail Wheel Bearings—A Review of Grease Lubrication for This Application

Allmaier

2022

Lubricants

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Billions of rolling bearings (RB) are in use today in a broad and diverse range of applications. In the mobility sector, RB help to reduce friction losses and increase efficiency. In rail applications, the rail wheel rolling bearing is a critical component, which requires a strict maintenance schedule. In this literature review, grease lubrication in RB is reviewed and potential ways to improve the service life of greases in RB are discussed with special emphasis on the application as rail wheel bearing. Understanding the discussed fundamental lubrication processes is the key to increase the service life of the rail wheel bearings and might provide a basis for future work that aims to make maintenance of these bearings condition-based (condition-based maintenance). This review is primarily intended for R&D professionals from rail (and related) industry and others being interested in a rather brief, but fundamental, overview of this subject.

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“…Define the slip ratio as ζ = Δu/u e = 1.0, Δu = u 2 --u 1 [31]. The Hertz contact half-width of the ball is b HZ and the calculated length in the x direction in the simulation is 6b HZ .…”

Section: Simulation Conditionsmentioning

confidence: 99%

Friction Properties and Distribution Rule of Lubricant Film of Full Ceramic Ball Bearing Under Different Service Condition

Sun¹

2021

Ceramics - Silikaty

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Full ceramic ball bearings are widely used in extreme and complex conditions, such as ultra-high/low temperature, ultrahigh speed, corrosion and insulation, because of their material specificity. In order to reveal the friction and lubrication properties, improve the service performance life of all ceramic ball bearings, a mathematical model of the oil lubrication for full ceramic ball bearings has been established in this paper. The distribution rule of the lubricant film in the contact area under different speeds and loads were analysed. The main factors influencing the peak mutation of the lubricant film pressure are clearly defined. The results are compared and analysed by using a ball-disc rolling lubricant film test machine. The study found that the thickness of the lubricant film of a full ceramic ball bearing is positively correlated with the bearing speed and negatively correlated with the bearing loads. The bearing speed has a relatively large effect on the change in the lubricant film thickness. The pressure of the lubricant film in the contact area is positively correlated with the bearing speed, but it is not affected by the bearing load. Unlike metal ball bearings, the thickness and pressure of the lubricant film have a greater relative rate of change in different positions in the contact area of full ceramic ball bearings. With an increase in the bearing speed, the necking-down effect has a greater influence on the peak mutation of the oil pressure. Only one pressure peak occurs in the oil film in the contact area. The results of this paper play an important role in revealing the friction and lubrication properties of full ceramic ball bearings and improving their service performance and life under oil lubrication conditions.

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Grease film evolution in rolling elastohydrodynamic lubrication contacts

Cited by 29 publications

References 49 publications

Effect of Lubricant Starvation on the Tribo-Dynamic Behavior of Linear Roller Guideway

Effect of Lubricant Starvation on the Tribo-Dynamic Behavior of Linear Roller Guideway

Increase Service Life for Rail Wheel Bearings—A Review of Grease Lubrication for This Application

Friction Properties and Distribution Rule of Lubricant Film of Full Ceramic Ball Bearing Under Different Service Condition

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