{"id":4815,"date":"2013-10-24T12:54:32","date_gmt":"2013-10-24T16:54:32","guid":{"rendered":"http:\/\/74.220.216.78\/?p=4815"},"modified":"2019-03-11T12:17:41","modified_gmt":"2019-03-11T16:17:41","slug":"bushing-pv-calculations","status":"publish","type":"post","link":"https:\/\/daemar.com\/fr\/bushing-pv-calculations.html\/","title":{"rendered":"Bushing PV Calculations"},"content":{"rendered":"<p><a href=\"https:\/\/daemar.com\/fr\">Home<\/a> &gt;&gt; <a href=\"https:\/\/daemar.com\/fr\/slide.html\">Slide<\/a> &gt;&gt; <a href=\"https:\/\/daemar.com\/fr\/bushings_dryslide_62.html\">Dryslide Bushings<\/a> &gt;&gt; Bushing PV Calculations<\/p>\n<div class=\"row-fluid\">\n<div class=\"rhcol span7\">\n<h1>PV Calculations<\/h1>\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"rhcol span1\"><\/div>\n<div class=\"rhcol span4\">\n<div class=\"toggle-box\"><h3 class=\"toggle-title sws_toggle1\">Technical Resources<\/h3><div class=\"toggle-content\"><\/p>\n<ul>\n<li><a href=\"http:\/\/catalog.daemar.com\/category\/bushings-bearings\">Bushing Online Catalogue<\/a><\/li>\n<li><a title=\"Bushing Design Notes\" href=\"https:\/\/daemar.com\/fr\/bushings_dryslide_design_notes_142.html\/\">Design Notes<\/a><\/li>\n<li><a title=\"Bushing Checking Methods\" href=\"https:\/\/daemar.com\/fr\/bushing-checking-methods-141.html\/\">Checking Methods<\/a><\/li>\n<li><a title=\"Bushing Installation Guide\" href=\"https:\/\/daemar.com\/fr\/bushing-installation-guide_143.html\/\">Installation Guide<\/a><\/li>\n<li><a title=\"Bushing Interchange\" href=\"https:\/\/daemar.com\/fr\/bushing-interchange.html\/\">Interchange<\/a><\/li>\n<li><a title=\"Dryslide Design Sheet\" href=\"https:\/\/daemar.com\/fr\/dryslide-design-sheet.html\/\">Application Data<\/a><\/li>\n<li><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2015\/08\/DMR_Bushing_PV_Comparison_T0G-090.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Bushing Material PV Comparison<\/a><\/li>\n<\/ul>\n<p><\/div><\/div>\n<\/div>\n<\/div>\n<hr style=\"border: 1px solid #cecece;\" \/>\n<p>&nbsp;<\/p>\n<div class=\"row-fluid\">\n<div class=\"rhcol span5\">\n<p>The load factor PV has considerable influence on determining the bearings useful operating life. PV is determined by multiplying the specific bearing load or pressure(p) by the sliding speed (v). Bearing materials are rated by a PV limit, with the PV limit representing the highest combination of load and speed under which the bearing material will operate. The PV unit of measure is N\/mm\u00b2 x m\/s.<\/p>\n<p>To determine P in an application: the specific bearing load (P) is determined by dividing the bearing load by the pressure supporting are of the bearing. The units for P are N\/mm\u00b2. The pressure supporting area depends on the specific geometry of the bearing, the following are formula for the most common types of bearing geometry.<\/p>\n<\/div>\n<div class=\"rhcol span7\"><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-pv-calculations.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4975\" title=\"PV calculations for Bushings \" alt=\"dmr-bushing-pv-calculations\" src=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-pv-calculations.jpg\" width=\"360\" height=\"480\" srcset=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-pv-calculations.jpg 600w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-pv-calculations-225x300.jpg 225w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-pv-calculations-400x533.jpg 400w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><\/div>\n<p>&nbsp;<\/p>\n<\/div>\n<hr style=\"border: 1px solid #cecece;\" \/>\n<p>&nbsp;<\/p>\n<div class=\"row-fluid\">\n<div class=\"span6 rhcol\">\n<p><strong>CALCULATION OF THE USEFUL LIFE<\/strong><\/p>\n<p>The operating life of a dry application TH sliding bushing is inversely<br \/>\nproportional to the load factor (p x v) but, in order to achieve a<br \/>\nclose approximation of the figure, the following corrective factors<br \/>\nmust be introduced:<br \/>\n\u2022 Ka = constant relative to the type of application<br \/>\n\u2022 fp = load correction factor<br \/>\n\u2022 fc = application characteristics and temperature correction factor<br \/>\n\u2022 fd= bearing size correction factor<br \/>\n\u2022 fm = shaft material correction factor<\/p>\n<p><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-calculation.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4977\" title=\"Calculation of life for a bushing\" alt=\"dmr-bushing-calculation\" src=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-calculation-300x112.jpg\" width=\"300\" height=\"112\" srcset=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-calculation-300x112.jpg 300w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-calculation-400x150.jpg 400w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-calculation.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<\/div>\n<div class=\"rhcol span6\"><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-direction.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4986\" title=\"bushing direction\" alt=\"dmr-bushing-direction\" src=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-direction.jpg\" width=\"300\" height=\"300\" srcset=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-direction.jpg 300w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-direction-150x150.jpg 150w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-direction-200x200.jpg 200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/div>\n<div class=\"rhcol span6\"><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-charastics.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4978\" title=\"characteristics for bushings \" alt=\"dmr-bushing-charastics\" src=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-charastics.jpg\" width=\"420\" height=\"210\" srcset=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-charastics.jpg 600w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-charastics-300x150.jpg 300w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-charastics-400x200.jpg 400w\" sizes=\"auto, (max-width: 420px) 100vw, 420px\" \/><\/a><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<div class=\"row-fluid\">\n<div class=\"span6 rhcol\"><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-material.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4982\" title=\"Bushing shaft material\" alt=\"dmr-bushing-material\" src=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-material.jpg\" width=\"300\" height=\"300\" srcset=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-material.jpg 300w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-material-150x150.jpg 150w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-material-200x200.jpg 200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/div>\n<div class=\"rhcol span6\">\n<p><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-shaft-diameter.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4985\" title=\"shaft diameter for bushings \" alt=\"dmr-bushing-shaft-diameter\" src=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-shaft-diameter-300x100.jpg\" width=\"300\" height=\"100\" srcset=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-shaft-diameter-300x100.jpg 300w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-shaft-diameter-400x133.jpg 400w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-shaft-diameter.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><strong>APPLICATION<\/strong><\/p>\n<p><span style=\"font-size: 13px; line-height: 19px;\">Having calculated the life of the bushing (Lh), the engineer has to<\/span><br \/>\ndecide whether to accept or reject the data obtained. If the estimated<br \/>\nlife is not acceptable, the sizes of the bushing are modified and a new<br \/>\ncheck is made following the sequence previously adopted.<br \/>\nFor a more detailed estimation of the operating life of DMR bushings<br \/>\nand other products in the series, please complete the Application<br \/>\nData Sheet at the back of the catalogue and fax it to your local<br \/>\nDaemar Technical Sales Representative.<br \/>\nFor applications that come close to the design limits, it is always<br \/>\nadvisable to carry out prototype testing.<\/p>\n<\/div>\n<\/div>\n<hr style=\"border: 1px solid #cecece;\" \/>\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"row-fluid\">\n<div class=\"span6 rhcol\">\n<p><strong>RUNNING-IN PERIOD<\/strong><\/p>\n<p>In order to complete the information and the calculations concerning the operating life of the bearings, consideration must be given to the operating method and the degree of wear on the bearings. The bearings have an initial running-in period during which the outer layer of the sliding surface is transferred onto the matting surface, compensating for the non-flatness of the contact and making the coefficient of friction stable.<\/p>\n<p>After the running-in phase, the porous bronze layer is gradually exposed. The surface of the exposed bronze increases with the number of operating hours until it reaches 90% of the contact surface. At this point , the bearing is considered to have reached the end of its useful life.<\/p>\n<p>If, after the running-in period, the bronze is exposed regularly over all the contact area, if confirms that the application was correct.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-image.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4984\" title=\"bushing running in period\" alt=\"dmr-bushing-running-period-image\" src=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-image-300x100.jpg\" width=\"300\" height=\"100\" srcset=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-image-300x100.jpg 300w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-image-400x133.jpg 400w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-image.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<\/div>\n<div class=\"span6 rhcol\"><a href=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-graph.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4983\" title=\"bushing wear chart \" alt=\"dmr-bushing-running-period-graph\" src=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-graph.jpg\" width=\"300\" height=\"300\" srcset=\"https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-graph.jpg 300w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-graph-150x150.jpg 150w, https:\/\/daemar.com\/fr\/wp-content\/uploads\/sites\/3\/2013\/10\/dmr-bushing-running-period-graph-200x200.jpg 200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Home &gt;&gt; Slide &gt;&gt; Dryslide Bushings &gt;&gt; Bushing PV Calculations PV Calculations &nbsp; &nbsp; The load factor PV has considerable influence on determining the bearings [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":4975,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[54,2],"tags":[],"class_list":["post-4815","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-resources","category-slide"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bushing PV Calculations - Daemar Inc \u2014 Joints Toriques - \u00c9tanch\u00e9it\u00e9 - Bagues de retenue - Coussinets - Caplugs - Cales de support - Clefs en barre<\/title>\n<meta name=\"description\" content=\"Bushing PV calculations has considerable influence on determining the bearings useful operating life.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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