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

Allmaier, Hannes

doi:10.3390/lubricants10030036

Cited by 8 publications

(7 citation statements)

References 46 publications

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“…NSGA-II was used to optimize the production of raw materials and the preparation process of CSCPG. The tribological performance and service life of CSCPG before and after optimization were compared, and the following conclusions were obtained: (1) The USFD method was used to screen those factors that may affect the tribological properties and service life of CSCPG during the preparation process. It was found…”

Section: Discussionmentioning

confidence: 99%

“…With the popularization of ultra-precision machining technology in the field of bearing processing, surface roughness and machining accuracy are no longer the main factors restricting bearing quality. More bearing failures are caused by lubrication failures, and bearing lubrication has gradually become a key factor in the reliability and efficiency of mechanical systems [1]. Therefore, how to improve bearing lubrication status to reduce bearing friction and extend bearing life while meeting the requirements of various extreme working conditions has significant theoretical significance and engineering application value.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of the Tribological Performance and Service Life of Calcium Sulfonate Complex—Polyurea Grease Based on Unreplicated Saturated Factorial Design

Zhang,

Mo,

Liu

et al. 2023

Lubricants

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In order to further extend the service life of calcium sulfonate complex–polyurea grease (CSCPG) while ensuring its tribological performance, this article starts with the production of raw materials and the preparation process of the grease and explores the factors that significantly affect the tribological performance and service life of CSCPG based on unreplicated saturated factorial design (USFD). The Kriging prediction model is used along with the optimization objectives of friction coefficient and service life, and nondominated sorting genetic algorithm II (NSGA-II) was used for a multi-objective optimization solution. The tribological and service life tests were conducted before and after optimization. The results show that the viscosity of the base oil and the content of the nano-solid friction reducers have a significant impact on the tribological properties of CSCPG. The content of polyurea thickeners and antioxidants, as well as the thickening reaction temperature, have a significant impact on the service life of CSCPG. When the friction coefficient and service life are optimized as objectives and are compared to the initial group, the friction coefficient of CSCPG could be reduced by 5.3%, and the service life could be extended by 3.8%. The Kriging prediction model based on USFD has high accuracy and can be used to guide the preparation and performance optimization of CSCPG.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of the Tribological Performance and Service Life of Calcium Sulfonate Complex—Polyurea Grease Based on Unreplicated Saturated Factorial Design

Zhang,

Mo,

Liu

et al. 2023

Lubricants

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“…It is of interest to compare the performance of structures with different anti-friction layer materials [6,18]. Also of interest is the study of the performance of different lubricants in the structure and consideration of lubricant viscosity [38,49,50].…”

Section: About the Materialsmentioning

confidence: 99%

Influence Analysis of Lubricant Recesses on the Working Capacity of the Bridge Span Spherical Bearing

Nosov

Kamenskikh

2022

Lubricants

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The load on transport and logistics systems is increasing every year. This is due to car park growth around the world. Thus, increasing bridge structure durability is an urgent task for bridge-building companies. This study analyses the contact deformation of spherical bearing elements through an anti-friction polymer layer with different geometrical configurations of recesses for the lubricant, i.e., annular grooves and spherical holes. The material of the anti-friction layer (a modified polytetrafluoroethylene (PTFE)) is modelled within the framework of the deformation theory of plasticity. The procedure of automating the numerical model construction depends on the input parameters, including the thickness of the layer, the basic geometrical parameters of the recesses for the lubricant, and the distance between the rows of recesses, etc. The influence of the arrangement of filling sliding anti-friction layers on recesses for lubricants in the form of spherical holes on the contact deformation behaviour of bridge bearings has been considered. The reduction of lubricant volume in the sliding anti-friction layer with the geometry of recesses in the form of spherical holes ranges from 26 to 48.4%, depending on the filling scheme, has been found. In this case, structures with lubrication recesses in the form of spherical holes have several advantages, including a more uniform distribution of contact parameters in the interface areas of the steel plates with the anti-friction layer, reduction of the maximum level of the plastic deformation intensity, displacements along the normal relative to the free end of the sliding layer, and the settlement of the bearing.

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“…It is well known that rail lubrication can reduce the friction coefficient of the contact interface between the wheel and the rail to about 0.1, thus alleviating the rail wear and fatigue damage. It is an effective method to maintain good wear properties during service even in the small-radius curved rails [11][12][13][14]. Commonly, the friction modification between the wheel and the rail could be divided into two kinds, i.e., rail side lubrication and top-ofrail (TOR) friction modification.…”

Section: Introductionmentioning

confidence: 99%

Effects of Lubricating Conditions on Wear Performance of U77MnCrH Rail

Liang,

Wei,

et al. 2024

Metals

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With the rapid development of railway towards being high speed and having heavy load capacity, the wheel–rail wear and rolling contact fatigue in the curve section with a small radius of freight have become the key problems in urban railways, which need to be solved urgently. The aims of this study were to compare the wear resistance with three different lubricating conditions on wheel–rail wear based on the wheel–rail rolling contact simulation tests. The wear loss, microhardness, and microstructure of the contacted surface of the rail were detected systematically. The results showed that the wear rates of rail were reduced by 71% for grease lubrication and 55% for solid lubrication, compared to those without lubrication. At the same time, the thickness of plastic deformation layer of rail samples were about 167 μm for the dry state, 138 μm for the solid lubrication state, and 128 μm for the oil lubrication state, respectively. It indicates that the thickness of the plastic deformation layer was significantly reduced under both grease and/or solid lubricating conditions. In addition, the microstructure of the deformation layer with two kinds of lubricated states was coarser and denser than that without lubricants. The average grain size of the deformation layer was approximately 0.22 μm under dry conditions and 0.32 μm under lubricated conditions. It also indicated that the changes in lubricants did not have a significant effect on the average grain size of the deformation layer. The results of the present study could provide theoretical reference for the development and design of lubricants used as rail materials.

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

Cited by 8 publications

References 46 publications

Optimization of the Tribological Performance and Service Life of Calcium Sulfonate Complex—Polyurea Grease Based on Unreplicated Saturated Factorial Design

Optimization of the Tribological Performance and Service Life of Calcium Sulfonate Complex—Polyurea Grease Based on Unreplicated Saturated Factorial Design

Influence Analysis of Lubricant Recesses on the Working Capacity of the Bridge Span Spherical Bearing

Effects of Lubricating Conditions on Wear Performance of U77MnCrH Rail

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