{"title":"Lubrication of gears","authors":"A. Kubo","doi":"10.1108/eb052267","DOIUrl":"https://doi.org/10.1108/eb052267","url":null,"abstract":"","PeriodicalId":158456,"journal":{"name":"Japanese journal of tribology","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114761489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1080/10402009608983505
Yoshio Kumada, K. Hashizume, Y. Kimura
Higher performance of recent automotive engines requires their bearings to operate under more severe conditions like higher speeds, higher loads and higher temperatures. To meet this requirement, plain bearings with circumferential microgrooves have been developed. Experimental evaluation as well as theoretical analysis has revealed that the ease of initial wear and deformation at the ridges leads to superior conformabilily, increased oil flow along the microgrooves achieves lower bearing temperature, and the oil retained in the microgrooves prevents seizure tinder starved lubricating conditions. Presented at the 50th Annual Meeting in Chicago, Illinois May 14–19, 1995
{"title":"Performance of plain bearings with circumferential microgrooves","authors":"Yoshio Kumada, K. Hashizume, Y. Kimura","doi":"10.1080/10402009608983505","DOIUrl":"https://doi.org/10.1080/10402009608983505","url":null,"abstract":"Higher performance of recent automotive engines requires their bearings to operate under more severe conditions like higher speeds, higher loads and higher temperatures. To meet this requirement, plain bearings with circumferential microgrooves have been developed. Experimental evaluation as well as theoretical analysis has revealed that the ease of initial wear and deformation at the ridges leads to superior conformabilily, increased oil flow along the microgrooves achieves lower bearing temperature, and the oil retained in the microgrooves prevents seizure tinder starved lubricating conditions. Presented at the 50th Annual Meeting in Chicago, Illinois May 14–19, 1995","PeriodicalId":158456,"journal":{"name":"Japanese journal of tribology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134073322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1299/JSMEKANTO.2003.9.243
T. Makino, T. Kawase
The authors measured the traction at work on a rolling/sliding contact part where there was spin for two types of synthetic naphthene oil at average hertz surface pressures of 1.0∼1.6 GPa, oil temperatures of 40∼120°, peripheral velocities of 10∼20 m/s, and slide/roll ratios of 0-10%. They also calculated traction with spin by combining the calculated traction based on Johnson & Tevaarwerk's non-linear viscoelastic model with consideration of the distribution of slide speed within the ellipse of contact, and then compared this traction-with-spin calculation to the test results. The comparison showed that if one can precisely forecast traction without spin with a wide-ranging slide/roll ratio, then one can also forecast with much precision the traction with spin using the current method. Regarding the effects of load, oil temperature, and peripheral velocity, the study also showed that while load and peripheral velocity have a major effect when there is spin, oil temperature has a small effect.
{"title":"Effects of spin on traction characteristics","authors":"T. Makino, T. Kawase","doi":"10.1299/JSMEKANTO.2003.9.243","DOIUrl":"https://doi.org/10.1299/JSMEKANTO.2003.9.243","url":null,"abstract":"The authors measured the traction at work on a rolling/sliding contact part where there was spin for two types of synthetic naphthene oil at average hertz surface pressures of 1.0∼1.6 GPa, oil temperatures of 40∼120°, peripheral velocities of 10∼20 m/s, and slide/roll ratios of 0-10%. They also calculated traction with spin by combining the calculated traction based on Johnson & Tevaarwerk's non-linear viscoelastic model with consideration of the distribution of slide speed within the ellipse of contact, and then compared this traction-with-spin calculation to the test results. The comparison showed that if one can precisely forecast traction without spin with a wide-ranging slide/roll ratio, then one can also forecast with much precision the traction with spin using the current method. Regarding the effects of load, oil temperature, and peripheral velocity, the study also showed that while load and peripheral velocity have a major effect when there is spin, oil temperature has a small effect.","PeriodicalId":158456,"journal":{"name":"Japanese journal of tribology","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130962082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Martin Rojas-Campanur, J. Lara‐Romero, F. Chiñas-Castillo, G. Alonso-Núñez
Lubricants for metalworking applications make extensive use of water-soluble additives to reduce friction and wear. In order to do such task, these additives must form a lubricating film that separates the contact surfaces thus imparting good surface finish to the worked parts. This paper presents a study on the tribological performance of aqueous solutions of rosin acids. Tests were carried out on a pin-on-disk tribometer for a steel-aluminum contact while keeping load, entrainment speed, sliding distance, temperature and concentration of the additive constant to study the lubrication effect of the additive-containing solutions. Chemical analysis of the wear track indicates the in-contact formation of an organic film caused by the additive interaction and aluminium surface. A substantial friction and wear reduction is observed.
{"title":"Tribological Performance of Rosin Acids Additive in Water Based Lubricants","authors":"Martin Rojas-Campanur, J. Lara‐Romero, F. Chiñas-Castillo, G. Alonso-Núñez","doi":"10.2474/TROL.2.29","DOIUrl":"https://doi.org/10.2474/TROL.2.29","url":null,"abstract":"Lubricants for metalworking applications make extensive use of water-soluble additives to reduce friction and wear. In order to do such task, these additives must form a lubricating film that separates the contact surfaces thus imparting good surface finish to the worked parts. This paper presents a study on the tribological performance of aqueous solutions of rosin acids. Tests were carried out on a pin-on-disk tribometer for a steel-aluminum contact while keeping load, entrainment speed, sliding distance, temperature and concentration of the additive constant to study the lubrication effect of the additive-containing solutions. Chemical analysis of the wear track indicates the in-contact formation of an organic film caused by the additive interaction and aluminium surface. A substantial friction and wear reduction is observed.","PeriodicalId":158456,"journal":{"name":"Japanese journal of tribology","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122975005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A crystal surface (or interface with foreign substances) is generally known to have an atomic arrangement different from that of an internal crystal structure. The properties of substances depend more largely on the arrangement (or crystal structure) of constituent elements than on constituent elements per se. The recent high-degree integration of electronic devices has greatly increased the importance of knowing the exact crystal structures of surfaces and interfaces or controlling them into desired structures. Additionally, nanostructures such as carbon nanotubes can be considered as substances consisting entirely of surfaces, thus showing the close relationship between nanotechnology and surface science. This experiment is intended to investigate the surface structures of a crystal (Si(111) surface) placed in an ultrahigh vacuum using reflection high-energy electron diffraction (RHEED). Also to be studied are the structures of the crystal surfaces with other substances (Ag/Au) deposited on it.
{"title":"Reflection high-energy electron diffraction, RHEED","authors":"A. Ichimiya","doi":"10.1351/goldbook.r05238","DOIUrl":"https://doi.org/10.1351/goldbook.r05238","url":null,"abstract":"A crystal surface (or interface with foreign substances) is generally known to have an atomic arrangement different from that of an internal crystal structure. The properties of substances depend more largely on the arrangement (or crystal structure) of constituent elements than on constituent elements per se. The recent high-degree integration of electronic devices has greatly increased the importance of knowing the exact crystal structures of surfaces and interfaces or controlling them into desired structures. Additionally, nanostructures such as carbon nanotubes can be considered as substances consisting entirely of surfaces, thus showing the close relationship between nanotechnology and surface science. This experiment is intended to investigate the surface structures of a crystal (Si(111) surface) placed in an ultrahigh vacuum using reflection high-energy electron diffraction (RHEED). Also to be studied are the structures of the crystal surfaces with other substances (Ag/Au) deposited on it.","PeriodicalId":158456,"journal":{"name":"Japanese journal of tribology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130302710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：