Lubrication Science最新文献

Influence of Lubrication Viscosity on Dynamic Characteristics of Full-Ceramic Bearings

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2025-01-03 DOI: 10.1002/ls.1738

Zhan Wang, Zhenpeng Liu, Zinan Wang, Peng Zhou, Shiyu Xing

{"title":"Influence of Lubrication Viscosity on Dynamic Characteristics of Full-Ceramic Bearings","authors":"Zhan Wang, Zhenpeng Liu, Zinan Wang, Peng Zhou, Shiyu Xing","doi":"10.1002/ls.1738","DOIUrl":"https://doi.org/10.1002/ls.1738","url":null,"abstract":"<div>\u0000 \u0000 <p>Full-ceramic bearings possess numerous exceptional attributes, such as enhanced rigidity and superior resistance to wear. Nevertheless, full-ceramic bearings consistently encounter elevated temperatures for extended periods of high-speed operation, which easily affect the processing performance of the equipment. Lubrication viscosity has a significant effect on bearing heat generation, so it is meaningful to approach the effect of lubrication viscosity with respect to the dynamics of full-ceramic bearings. Full-ceramic angular contact ball bearings are treated as research objects to analyse their optimal working condition in this article. A coupled fluid–solid simulation model is constructed for analysis of the fluid and solid in the bearing cavity. First, at the conditions of different lubricant viscosity, the oil volume distribution, temperature field distribution in the bearing cavity is analysed. Then, the vibration characteristics of the inner ring is examined by constructing a dynamic model of the inner ring. Meanwhile, temperature and vibration variation of full-ceramic bearings are verified through experiments under different rotational speeds. The results show that the lubricant volume distribution inside the bearing cavity is nonuniformly distributed, which the lubricant is mainly located in the outer ring groove position. Moreover, elevating the lubricant viscosity within a certain range promotes the enhancement of bearing lubrication properties. The maximum error of the bearing temperature between the simulation results and the experiment is 7.592%. Ultimately, the simulation analysis is validated through experiments, and it provides a theoretical foundation for selecting optimal parameters for the oil–air lubrication of full-ceramic bearing.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 3","pages":"237-249"},"PeriodicalIF":1.8,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lubrication Performance and Wear Mechanism of Double-Circular-Arc Spiral Bevel Gears for Nutation Drive in Mixed Lubrication

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-12-19 DOI: 10.1002/ls.1737

Bin Lin, Ling Pan, Jiating Tang, Shiyang Tan, Jun Zhang

{"title":"Lubrication Performance and Wear Mechanism of Double-Circular-Arc Spiral Bevel Gears for Nutation Drive in Mixed Lubrication","authors":"Bin Lin, Ling Pan, Jiating Tang, Shiyang Tan, Jun Zhang","doi":"10.1002/ls.1737","DOIUrl":"https://doi.org/10.1002/ls.1737","url":null,"abstract":"<div>\u0000 \u0000 <p>A thermal elastohydrodynamic lubrication model is combined with a wear model under mixed lubrication to investigate the lubrication performance and wear characteristics of double-circular-arc spiral bevel gears for nutation drive. Moreover, the effects of operating conditions on the characteristic parameters of the film are analysed under the mixed lubrication point-contact conditions. Furthermore, the characteristics of gears in terms of friction coefficient and wear depth are discussed. According to the results, the performance of lubrication and wear during the mutual meshing of the convex tooth surface of the external bevel gear and the concave tooth surface of the inner bevel gear is better than that during the mutual meshing of the other pair of tooth surfaces. The minimum film thickness of the whole meshing process occurs near the inner of the bevel gear due to the joint action of the load and the end edge effect. Moreover, an increase in torque at a certain rotational speed is favourable to the lubrication performance of the meshing process. The wear depth in the double-circular-arc spiral bevel gears' meshing process is heavily influenced by the roughness of the tooth surface.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 3","pages":"222-236"},"PeriodicalIF":1.8,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wear Simulations of Involute Harmonic Gear Under Mixed Lubrication Condition

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-12-10 DOI: 10.1002/ls.1735

Yi Shen, Tao He, Jiangkai Feng

{"title":"Wear Simulations of Involute Harmonic Gear Under Mixed Lubrication Condition","authors":"Yi Shen, Tao He, Jiangkai Feng","doi":"10.1002/ls.1735","DOIUrl":"https://doi.org/10.1002/ls.1735","url":null,"abstract":"<div>\u0000 \u0000 <p>Harmonic gears are widely used in precise space technology, robotic, medical equipment and other fields, while the magnitude of surface topography changes due to wear is usually comparable to or larger than the original surface roughness and elastic deformation, leading to severe transmission failures. This paper reports a numerical approach to simulate the lubrication status considering wear evolution based on mixed elastohydrodynamic lubrication (EHL) and Archard models, in which the Reynolds equation is solved with finite difference method and surface deformation is calculated by the discrete convolution-fast Fourier transform (DC-FFT) algorithm. The interfacial pressure and film thickness distributions are validated by comparison with available results from literature. The harmonic gear lubrication and wear performances are calculated, including effects of machined surface, velocity, load, wear time and material properties, and the results suggest that avoiding long-term and high-torque working with a large wear coefficient can effectively prevent surface wear failure, which is beneficial for increasing the harmonic gears' lifespan.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 3","pages":"208-221"},"PeriodicalIF":1.8,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of LaF3 on the Properties of Pb-Free Cu-Based Self-Lubricating Composites

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-12-04 DOI: 10.1002/ls.1734

Cong Liu, Yanguo Yin, Rongrong Li, Haoping Wang, Liang Li

{"title":"Effect of LaF3 on the Properties of Pb-Free Cu-Based Self-Lubricating Composites","authors":"Cong Liu, Yanguo Yin, Rongrong Li, Haoping Wang, Liang Li","doi":"10.1002/ls.1734","DOIUrl":"https://doi.org/10.1002/ls.1734","url":null,"abstract":"<div>\u0000 \u0000 <p>A strategy involving the use the rare-earth compound LaF<sub>3</sub> with good lubrication and stability properties as a filler in the preparation of Cu-based composites was proposed to solve the problem of poor wear resistance in Pb-free Cu-Bi materials. The influence and regulatory mechanism of LaF<sub>3</sub> content on the mechanical and tribological properties of these composites were studied. The results indicate that LaF<sub>3</sub> has a good refining effect on Cu alloy grains, and LaF<sub>3</sub> and Bi are distributed in a network along the grain boundaries of the Cu alloy in the material. As the LaF<sub>3</sub> content increases, the mechanical properties and friction coefficient of the composite gradually decrease, and the wear rate first declines and then increases. The wear resistance of Cu-Bi composite containing LaF<sub>3</sub> mainly depends on the mechanical support provided by the matrix. When the LaF<sub>3</sub> content is higher than 6%, the composite strength is extremely low, and the increase in lubricant content at the friction interface does not play a decisive role in the material wear behaviour. The material wear rate increases with the increase in LaF<sub>3</sub> content. Therefore, using 6% LaF<sub>3</sub> is recommended to improve the wear resistance of the material and maintain a balance among its mechanical properties, antifriction and wear resistance.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 3","pages":"198-207"},"PeriodicalIF":1.8,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Diisooctyl Phosphate-Modified Ultra-Small Zinc Oxide Nanoparticle and Investigation of Its Tribological Properties as Additive in Alkylnaphthalene

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-11-10 DOI: 10.1002/ls.1731

Zhenghao Li, Shuguang Fan, Ningning Song, Guangbin Yang, Chunli Zhang, Laigui Yu, Yujuan Zhang, Shengmao Zhang

{"title":"Preparation of Diisooctyl Phosphate-Modified Ultra-Small Zinc Oxide Nanoparticle and Investigation of Its Tribological Properties as Additive in Alkylnaphthalene","authors":"Zhenghao Li, Shuguang Fan, Ningning Song, Guangbin Yang, Chunli Zhang, Laigui Yu, Yujuan Zhang, Shengmao Zhang","doi":"10.1002/ls.1731","DOIUrl":"https://doi.org/10.1002/ls.1731","url":null,"abstract":"<div>\u0000 \u0000 <p>ZnO nanoparticle surface-modified by diisooctyl phosphate (P204) was prepared by liquid-phase in situ surface modification technique with zinc acetate as the raw material, P204 as the modifier and anhydrous ethanol as the solvent. The morphology and microstructure of the P204-ZnO nanoparticle were characterised by transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectrometry. Its thermal stability was evaluated by thermogravimetric analysis; and its tribological properties as the additive in alkylnaphthalene were evaluated with an SRV-5 friction and wear tester in reciprocal sliding mode. The results show that the as-prepared P204-ZnO nanoparticle has an average particle size of about 4 nm and a P204 content of about 42% (mass fraction); and the surface modifier is grafted onto the surface of ZnO nanoparticle by physical adsorption. With a mass fraction of 0.5% in alkylnaphthalene base oil, P204-ZnO nano-additive can mildly reduce the friction coefficient and drastically reduce the wear rate of the steel–steel sliding pair. This is due to the formation of the composite tribofilm via the adsorption and deposition of the nano-additive on rubbed steel surfaces as well as the tribochemical reactions of the modifier P204 yielding phosphate and of steel substrate yielding iron oxides. The as-formed composite tribofilm with a thickness of about 20 nm, consisting of phosphate and iron oxides as the binder as well as deposited ZnO nanoparticle as the filling phase, is responsible for the excellent friction-reducing and antiwear abilities of P204-ZnO nano-additive for the steel sliding contact.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 3","pages":"189-197"},"PeriodicalIF":1.8,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Role of Functionalized CuO Additive in Enhancing Tribological Performance of Plastic Oil Lubricant

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-11-07 DOI: 10.1002/ls.1732

Soumya Sikdar, Pradeep L. Menezes

{"title":"The Role of Functionalized CuO Additive in Enhancing Tribological Performance of Plastic Oil Lubricant","authors":"Soumya Sikdar, Pradeep L. Menezes","doi":"10.1002/ls.1732","DOIUrl":"https://doi.org/10.1002/ls.1732","url":null,"abstract":"<div>\u0000 \u0000 <p>The study investigated the potential of waste plastic oil (PO) as an alternative to petroleum-based lubricants, specifically mineral oil. The rheological properties, dispersion stability, friction, and wear performance of PO were examined and compared with mineral oil. Results showed that PO demonstrated similar lubrication performance to mineral oil. To enhance the lubrication performance of PO, the study incorporated various concentrations of nano CuO solid lubricant additives, resulting in the formation of CuO nano lubricants. These lubricants showed an improvement in friction and wear by 20% and 44% compared with PO. Furthermore, the CuO solid lubricant additives were functionalized and incorporated in the same concentrations into PO, resulting in the formation of functionalized nano lubricants, which further lowered the friction and wear by 28% and 91% compared with PO. The novelty of the paper is that a simple chemical functionalization process that not only helped in improving its dispersion stability of additives in the PO, but also enhanced the wear performance. The mechanisms behind the enhancement of friction and wear performance were discussed. Based on these findings, it can be concluded that incorporating functionalized nano additives in PO improve friction and wear performance in mechanical components, promoting wider utilisation of PO.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 2","pages":"170-188"},"PeriodicalIF":1.8,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143248737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lubrication Prediction of Sphere-Gradient Coated Half Space Interfaces

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-11-05 DOI: 10.1002/ls.1728

Xiaoya Gong, Tao He

引用次数: 0

Study on the Performance of Different Crystal Forms Nano MoS2 as Lubricant Additives in Reducing Wear and Friction

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-11-05 DOI: 10.1002/ls.1727

Runling Peng, Wei Wang, Hang Du, Jinyue Liu, Zhan Gao, Junde Guo, Wei Cao

{"title":"Study on the Performance of Different Crystal Forms Nano MoS2 as Lubricant Additives in Reducing Wear and Friction","authors":"Runling Peng, Wei Wang, Hang Du, Jinyue Liu, Zhan Gao, Junde Guo, Wei Cao","doi":"10.1002/ls.1727","DOIUrl":"https://doi.org/10.1002/ls.1727","url":null,"abstract":"<div>\u0000 \u0000 <p>In order to investigate the anti-friction and anti-wear performance of different crystal forms nano MoS<sub>2</sub> in paraffin oil. Freeze-drying method combined with hydrothermal was used to prepare different crystal forms nano MoS<sub>2</sub> and their microstructures were characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The anti-friction and anti-wear performance of MoS<sub>2</sub> nanoparticles as lubricat additives under different working conditions was investigated by the ball-and-disk friction and wear testing machine and the mechanism of friction and wear reduction was investigated. The results showed that the thickness of the floral sheet MoS<sub>2</sub> flakes was about 10 nm and the particle size of the spherical MoS<sub>2</sub> was about 90 nm. When the addition concentration was 3 wt%, the friction coefficient of the floral sheet MoS<sub>2</sub> in paraffin oil was lower at 0.094, which was 29.3% lower than that of the pure paraffin oil, the width of the abrasion marks was 24.2% lower than that of the pure paraffin oil and the wear rate was 71.6% lower than that of the pure paraffin oil; The friction coefficient of the spherical MoS<sub>2</sub> with 2.5 wt% addition was 0.082, which was 38.3% lower than the friction coefficient of pure paraffin oil, 24.1% lower than that of paraffin oil in terms of wear scar width and 81.9% lower than that of paraffin oil in terms of wear rate.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 2","pages":"158-169"},"PeriodicalIF":1.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143248518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Thermal Analysis of Greased Rolling Bearing Considering Surface Topography and Plastic Deformation

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-11-05 DOI: 10.1002/ls.1730

Jiaqi Li, Linxue An, Yuping Huang, Zhenshun Li, Ben An, Ben Guan, Rui Li

引用次数: 0

Experimental Study on Enhancement in the Tribological Behaviour of Military Grade Lubricant Using Titanium Dioxide Nanoadditives for Aerospace Applications

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2024-10-28 DOI: 10.1002/ls.1729

M. Senthil Kumar, A. Elayaperumal, Sankaraiah Mada, H. Sathyanarayana

{"title":"Experimental Study on Enhancement in the Tribological Behaviour of Military Grade Lubricant Using Titanium Dioxide Nanoadditives for Aerospace Applications","authors":"M. Senthil Kumar, A. Elayaperumal, Sankaraiah Mada, H. Sathyanarayana","doi":"10.1002/ls.1729","DOIUrl":"https://doi.org/10.1002/ls.1729","url":null,"abstract":"<div>\u0000 \u0000 <p>The coefficient of friction of low carbon chromium alloy steel with military grade lubricant was high, resulting in increased heat generation and temperature rise of the lubricant in the aircraft power transmission units such as engine gearbox, accessory gearbox and so on. To address this, the current research proposes the addition of TiO<sub>2</sub> nanoparticles to MIL grade lubricant as an additive to enhance the tribological performance. In this experimental study, TiO<sub>2</sub> nanolubricant was prepared using various surfactants for better suspension of TiO<sub>2</sub> nanoparticles, and properties were evaluated for both base lubricant and nanolubricant. The tribological experiments were conducted using a four ball tester, a shear stability tester and a reichert tester. In a four ball test, TiO<sub>2</sub> nanolubricant resulted in a 27.3% reduction in wear scar diameter by the addition of TiO<sub>2</sub> nanoparticles to the base lubricant. In a shear stability test, TiO<sub>2</sub> nanolubricant showed 80% better shear stability than the base lubricant. In the reichert test, the coefficient of friction was reduced by 13% with the TiO<sub>2</sub> nanolubricant. The experimental findings demonstrated that the TiO<sub>2</sub> nanoparticles, as an additive to a military grade lubricant, have superior tribological properties for aerospace applications.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 2","pages":"117-128"},"PeriodicalIF":1.8,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143253568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0