{"id":4946,"date":"2025-06-10T16:58:37","date_gmt":"2025-06-10T11:28:37","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=4946"},"modified":"2025-07-26T15:27:05","modified_gmt":"2025-07-26T09:57:05","slug":"sliding-contact-bearing","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/me\/machine-design\/sliding-contact-bearing","title":{"rendered":"Sliding Contact Bearing"},"content":{"rendered":"<h2 style=\"text-align: justify;\">Thick Film Lubrication<\/h2>\n<p style=\"text-align: justify;\">In this, two surface of bearing in relative motion are completely separated by a film of fluid. Thus surface friction has no role, it has two types:<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_1 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.madeeasy.in\/study\/me\/machine-design\/sliding-contact-bearing\/#Hydrodynamic-Bearing\" >Hydrodynamic Bearing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.madeeasy.in\/study\/me\/machine-design\/sliding-contact-bearing\/#Hydro-Static-bearing\" >Hydro-Static bearing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.madeeasy.in\/study\/me\/machine-design\/sliding-contact-bearing\/#Thin-Film-Lubrication\" >Thin Film Lubrication<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.madeeasy.in\/study\/me\/machine-design\/sliding-contact-bearing\/#Measurement-of-Viscosity\" >Measurement of Viscosity<\/a><\/li><\/ul><\/nav><\/div>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Hydrodynamic-Bearing\"><\/span>Hydrodynamic Bearing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In hydrodynamic bearing, load-supporting fluid is created by shape and relative motion of sliding surfaces. It is not necessary to supply the lubricant under pressure. The only requirement is sufficient and continuous supply. Its main application is in engine<a href=\"https:\/\/study.madeeasy.in\/ce\/fluid-mechanics\/efficiencies-centrifugal-pump\/\" target=\"_blank\" rel=\"noopener\"> centrifugal pump<\/a>.<\/p>\n<p style=\"text-align: justify;\"><strong> Remember:<\/strong><\/p>\n<ul style=\"text-align: justify;\">\n<li><a href=\"https:\/\/study.madeeasy.in\/me\/machine-design\/bearing-material-properties\/\" target=\"_blank\" rel=\"noopener\">Bearing<\/a> which operate without lubricant is called zero film bearing.<\/li>\n<li>Journal Bearing: It is a sliding contact bearing working on hydro-dynamic lubrication, support the load in<br \/>\nradial direction. It has two types:<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4947 size-full\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2025\/06\/Journal-Bearing.jpg\" alt=\"Journal Bearing\" width=\"476\" height=\"149\" srcset=\"https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2025\/06\/Journal-Bearing.jpg 476w, https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2025\/06\/Journal-Bearing-300x94.jpg 300w\" sizes=\"auto, (max-width: 476px) 100vw, 476px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Hydro-Static-bearing\"><\/span>Hydro-Static bearing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In this system, load supporting fluid film separating two surfaces is created by external source like pump supplying sufficient fluid under pressure. Thus, it is also called externally pressurized bearing, it is used in centrifuges ball mills and vertical turbo generator.<\/p>\n<p style=\"text-align: justify;\"><strong> Advantages:\u00a0<\/strong><\/p>\n<ul style=\"text-align: justify;\">\n<li>High load carrying capacity<\/li>\n<li>Starting friction is absent<\/li>\n<li>There is no rubbing action<\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Thin-Film-Lubrication\"><\/span>Thin Film Lubrication<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Lubricant film is relatively thin and there is partial to metal contact. In this lubrication, under excessive load, less oil supply, low speed, misalignment, boundary lubrication will occur. Performance of bearing under boundary lubrication will depend upon.<\/p>\n<ol>\n<li style=\"text-align: justify;\">Chemical composition of lubricating oil.<\/li>\n<li style=\"text-align: justify;\">Surface roughness.<\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><strong> Remember:<\/strong><\/p>\n<p style=\"text-align: justify;\">Under excessive load and low speed, hydro-dynamic bearing also operates under boundary lubrication.<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Measurement-of-Viscosity\"><\/span>Measurement of Viscosity<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: center;\">Saybolt Universal Second (SUS), Zk = 0.22t &#8211; 180\/t<\/p>\n<p style=\"text-align: center;\">Here, Zk = Kinematic viscosity, t = <a href=\"https:\/\/study.madeeasy.in\/ce\/fluid-mechanics\/viscosity\/\" target=\"_blank\" rel=\"noopener\">Viscosity<\/a> in SUS<\/p>\n<p style=\"text-align: center;\"><a class=\"btn btn-danger\" role=\"button\" href=\"https:\/\/study.madeeasy.in\/me\/machine-design\/type-of-rolling-contact-bearing\/\" target=\"_blank\" rel=\"noopener\">&lt;&lt; Previous<\/a> | <a class=\"btn btn-success\" role=\"button\" href=\"https:\/\/study.madeeasy.in\/me\/machine-design\/mckee-investigation\/\" target=\"_blank\" rel=\"noopener\"> Next &gt;&gt;<\/a><br \/>\n<strong> Must Read: <\/strong> <a href=\"https:\/\/study.madeeasy.in\/me\/machine-design\/strength-of-welded-joints\/\" target=\"_blank\" rel=\"noopener\"><strong>What is Machine Design?<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thick Film Lubrication In this, two surface of bearing in relative motion are completely separated by a film of fluid.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1543,10],"tags":[1573,1572,1574],"class_list":["post-4946","post","type-post","status-publish","format-standard","hentry","category-machine-design","category-me","tag-hydro-static-bearing","tag-hydrodynamic-bearing","tag-measurement-of-viscosity"],"_links":{"self":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/4946","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/comments?post=4946"}],"version-history":[{"count":0,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/4946\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/media?parent=4946"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/categories?post=4946"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/tags?post=4946"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}