{"id":341,"date":"2023-06-21T06:22:21","date_gmt":"2023-06-21T06:22:21","guid":{"rendered":"https:\/\/physigeek.com\/pt\/rodas-de-friccao\/"},"modified":"2023-06-21T06:22:21","modified_gmt":"2023-06-21T06:22:21","slug":"rodas-de-friccao","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/rodas-de-friccao\/","title":{"rendered":"Rodas de fric\u00e7\u00e3o"},"content":{"rendered":"<p>Este artigo explica o que s\u00e3o rodas de fric\u00e7\u00e3o e para que s\u00e3o utilizadas. Assim, voc\u00ea encontrar\u00e1 a defini\u00e7\u00e3o de rodas de fric\u00e7\u00e3o, suas caracter\u00edsticas e seu funcionamento. Adicionalmente, s\u00e3o apresentados os diferentes tipos de rodas de fric\u00e7\u00e3o e as f\u00f3rmulas deste tipo de mecanismo. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-son-las-ruedas-de-friccion\"><\/span> O que s\u00e3o rodas de fric\u00e7\u00e3o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>Rodas de fric\u00e7\u00e3o<\/strong> s\u00e3o duas rodas usadas para transmitir movimento rotacional. Em outras palavras, as rodas de fric\u00e7\u00e3o s\u00e3o os elementos de um mecanismo que transmite movimento circular por fric\u00e7\u00e3o entre duas rodas.<\/p>\n<p> As rodas de fric\u00e7\u00e3o s\u00e3o, portanto, um sistema de transmiss\u00e3o por fric\u00e7\u00e3o, uma vez que o movimento de uma roda para outra \u00e9 transmitido gra\u00e7as ao atrito (ou atrito) entre elas.<\/p>\n<p> Um sistema de roda de fric\u00e7\u00e3o tem duas partes:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Roda motriz (ou roda de entrada)<\/strong> : \u00e9 a roda que transmite o movimento de rota\u00e7\u00e3o \u00e0 outra roda. De um modo geral, o eixo da roda motriz est\u00e1 acoplado a um motor, de modo que o motor transmite o movimento rotacional desejado \u00e0 roda motriz e esta \u00e0 roda motriz.<\/span><\/li>\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Roda motriz (ou roda de sa\u00edda)<\/strong> : \u00e9 a roda que gira gra\u00e7as ao movimento de rota\u00e7\u00e3o que lhe \u00e9 transmitido pela roda motriz.<\/span> <\/li>\n<\/ul>\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"530\" height=\"401\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/roues-a-friction.png\" alt=\"rodas de fric\u00e7\u00e3o\" class=\"wp-image-5999\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/roues-a-friction-300x227.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/roues-a-friction.png 530w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<p> Como voc\u00ea pode ver na imagem acima, duas rodas de fric\u00e7\u00e3o est\u00e3o em contato e, portanto, quando a roda acionada gira, isso causa atrito entre as duas rodas, o que faz com que a roda acionada gire.<\/p>\n<p> Al\u00e9m disso, o sentido de rota\u00e7\u00e3o entre duas rodas girat\u00f3rias consecutivas \u00e9 oposto. Ou seja, se uma roda de fric\u00e7\u00e3o girar no sentido hor\u00e1rio, a outra roda girar\u00e1 no sentido anti-hor\u00e1rio. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tipos-de-ruedas-de-friccion\"><\/span> Tipos de rodas de fric\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Os <strong>tipos de rodas de fric\u00e7\u00e3o<\/strong> s\u00e3o:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Rodas de fric\u00e7\u00e3o externas<\/strong> \u2013 O contato entre as duas rodas de fric\u00e7\u00e3o ocorre na parte externa de ambas as rodas. O sentido de rota\u00e7\u00e3o entre as rodas de fric\u00e7\u00e3o \u00e9 invertido.<\/span><\/li>\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Rodas de Fric\u00e7\u00e3o Interna<\/strong> : Uma roda de fric\u00e7\u00e3o est\u00e1 dentro da outra, de modo que o contato entre as duas rodas ocorre na superf\u00edcie interna da roda maior e na superf\u00edcie externa da roda menor. Neste tipo de rodas de fric\u00e7\u00e3o, ambas as rodas giram na mesma dire\u00e7\u00e3o.<\/span><\/li>\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Rodas de fric\u00e7\u00e3o frutoc\u00f4nicas<\/strong> : As rodas de fric\u00e7\u00e3o possuem o formato de um cone truncado e o contato entre as rodas \u00e9 feito em suas superf\u00edcies laterais. Os eixos das rodas de fric\u00e7\u00e3o n\u00e3o s\u00e3o, portanto, paralelos. Neste caso as rodas de fric\u00e7\u00e3o t\u00eam sentido de rota\u00e7\u00e3o oposto.<\/span> <\/li>\n<\/ul>\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-104 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center has-text-color has-medium-font-size\" style=\"color:#4fd12f\"> <strong>Rodas de fric\u00e7\u00e3o externas<\/strong> <\/p>\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"200\" height=\"151\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/roues-a-friction-externe.png\" alt=\"rodas de fric\u00e7\u00e3o exteriores\" class=\"wp-image-6005\"><\/figure>\n<\/div>\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center has-text-color has-medium-font-size\" style=\"color:#4fd12f\"> <strong>Rodas de fric\u00e7\u00e3o interna<\/strong> <\/p>\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"197\" height=\"181\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/roues-a-friction-interieure.jpeg\" alt=\"rodas de fric\u00e7\u00e3o interna\" class=\"wp-image-6006\"><\/figure>\n<\/div>\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center has-text-color has-medium-font-size\" style=\"color:#4fd12f\"> <strong>Rodas de fric\u00e7\u00e3o c\u00f4nicas<\/strong> <\/p>\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"200\" height=\"121\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/roues-a-friction-coniques.jpeg\" alt=\"rodas de fric\u00e7\u00e3o troncoc\u00f4nicas\" class=\"wp-image-6007\"><\/figure>\n<\/div>\n<\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Formula-de-las-ruedas-de-friccion\"><\/span> F\u00f3rmula da roda de fric\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Nas rodas de fric\u00e7\u00e3o, o di\u00e2metro da roda motriz multiplicado pela sua velocidade angular \u00e9 igual ao di\u00e2metro da roda motriz multiplicado pela sua velocidade angular. Portanto, a <strong>f\u00f3rmula para rodas de fric\u00e7\u00e3o<\/strong> \u00e9:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-3ae6afc13ded27f9c89e88eb1be7ed29_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_1\\cdot N_1 =D_2\\cdot N_2\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"137\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p style=\"margin-bottom:5px\"> Ouro: <\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-e263b7d8b237ebc903b5820b6c594a43_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_1\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"21\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 o di\u00e2metro da roda motriz. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-19d2ebf084401984e1f91e613f4b237f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N_1\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"20\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 a velocidade angular da roda motriz. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-c21fc78dd1af9a1401c06279b02a57cb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"D_2\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"22\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 o di\u00e2metro da roda motriz. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-fdc675066062105e48ad32d7da96e52b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N_2\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"21\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 a velocidade angular da roda motriz.<\/span><\/li>\n<\/ul>\n<p> Da mesma forma, da f\u00f3rmula anterior, podemos deduzir que a rela\u00e7\u00e3o entre a velocidade de sa\u00edda e a velocidade de entrada \u00e9 equivalente \u00e0 raz\u00e3o entre o di\u00e2metro de entrada e o di\u00e2metro de sa\u00edda. Assim, em todas as rodas de fric\u00e7\u00e3o, a seguinte equa\u00e7\u00e3o \u00e9 v\u00e1lida:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-1d5bd4f003ec5fc632bc04ba3c0df09f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\cfrac{N_2}{N_1}=\\cfrac{D_1}{D_2}\" title=\"Rendered by QuickLaTeX.com\" height=\"41\" width=\"70\" style=\"vertical-align: -15px;\"><\/p>\n<\/p>\n<p> Por outro lado, a rela\u00e7\u00e3o de transmiss\u00e3o (i) entre duas rodas de fric\u00e7\u00e3o \u00e9 definida como a raz\u00e3o entre a velocidade de rota\u00e7\u00e3o da roda motriz e a velocidade de rota\u00e7\u00e3o da roda motriz.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-f7fc7fe70b04d0f7dcb2dd63ef0f14ca_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"i=\\cfrac{N_2}{N_1}=\\cfrac{D_1}{D_2}\" title=\"Rendered by QuickLaTeX.com\" height=\"41\" width=\"102\" style=\"vertical-align: -15px;\"><\/p>\n<\/p>\n<p> Assim, de todas essas express\u00f5es podem ser deduzidas as seguintes rela\u00e7\u00f5es das rodas de fric\u00e7\u00e3o:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\">Se o di\u00e2metro da roda motriz for maior que o di\u00e2metro da roda motriz, a velocidade de rota\u00e7\u00e3o entre as rodas de fric\u00e7\u00e3o aumenta.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\">Se o di\u00e2metro da roda motriz for menor que o di\u00e2metro da roda motriz, a velocidade de rota\u00e7\u00e3o entre as rodas de fric\u00e7\u00e3o diminui.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\">Se o di\u00e2metro da roda motriz for igual ao di\u00e2metro da roda motriz, a velocidade de rota\u00e7\u00e3o entre as rodas de fric\u00e7\u00e3o \u00e9 mantida.<\/span> <\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ventajas-y-desventajas-de-las-ruedas-de-friccion\"><\/span> Vantagens e desvantagens das rodas de fric\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Abaixo est\u00e3o as vantagens e desvantagens das rodas de fric\u00e7\u00e3o como sistema de transmiss\u00e3o.<\/p>\n<p> <strong><u style=\"text-decoration-color:#4fd12f\">Vantagens das rodas de fric\u00e7\u00e3o:<\/u><\/strong><\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:15px\"> <span style=\"color:#101010;font-weight: normal;\">As rodas de fric\u00e7\u00e3o s\u00e3o f\u00e1ceis de fabricar, por isso seu pre\u00e7o costuma ser barato.<\/span><\/li>\n<li style=\"margin-bottom:15px\"> <span style=\"color:#101010;font-weight: normal;\">As rodas de fric\u00e7\u00e3o requerem muito pouca manuten\u00e7\u00e3o.<\/span><\/li>\n<li style=\"margin-bottom:15px\"> <span style=\"color:#101010;font-weight: normal;\">\u00c9 um sistema de transmiss\u00e3o de movimento silencioso.<\/span><\/li>\n<\/ul>\n<p> <strong><u style=\"text-decoration-color:#4fd12f\">Desvantagens das rodas de fric\u00e7\u00e3o:<\/u><\/strong><\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:15px\"> <span style=\"color:#101010;font-weight: normal;\">As rodas de fric\u00e7\u00e3o n\u00e3o conseguem transmitir for\u00e7a significativa entre os eixos, pois o funcionamento deste tipo de mecanismo est\u00e1 relacionado \u00e0 for\u00e7a de atrito produzida entre as duas rodas.<\/span><\/li>\n<li style=\"margin-bottom:15px\"> <span style=\"color:#101010;font-weight: normal;\">Existe o risco das rodas derraparem ou deslizarem umas contra as outras.<\/span><\/li>\n<li style=\"margin-bottom:15px\"> <span style=\"color:#101010;font-weight: normal;\">O desgaste das rodas de fric\u00e7\u00e3o \u00e9 muito alto em compara\u00e7\u00e3o com outros sistemas de transmiss\u00e3o, pois a transmiss\u00e3o por fric\u00e7\u00e3o desgasta muito os elementos do mecanismo.<\/span> <\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Aplicaciones-de-las-ruedas-de-friccion\"><\/span> aplica\u00e7\u00f5es de rodas de fric\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Por fim, veremos para que servem as rodas de fric\u00e7\u00e3o, pois al\u00e9m de entender o que s\u00e3o as rodas de fric\u00e7\u00e3o, tamb\u00e9m \u00e9 importante saber para que servem.<\/p>\n<p> Rodas de fric\u00e7\u00e3o s\u00e3o usadas como sistema de transmiss\u00e3o quando pouco esfor\u00e7o \u00e9 necess\u00e1rio. Por exemplo, um d\u00ednamo de bicicleta, equipamento de som ou alguns mecanismos simples de m\u00e1quinas usam rodas de fric\u00e7\u00e3o.<\/p>\n<p> Em geral, as rodas de fric\u00e7\u00e3o n\u00e3o podem ser usadas para transmitir alta pot\u00eancia porque podem escorregar ou deslizar umas contra as outras. Outro exemplo de utiliza\u00e7\u00e3o de rodas de fric\u00e7\u00e3o \u00e9 o mecanismo interno de algumas impressoras, que deve transmitir pequenas for\u00e7as.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que s\u00e3o rodas de fric\u00e7\u00e3o e para que s\u00e3o utilizadas. Assim, voc\u00ea encontrar\u00e1 a defini\u00e7\u00e3o de rodas de fric\u00e7\u00e3o, suas caracter\u00edsticas e seu funcionamento. Adicionalmente, s\u00e3o apresentados os diferentes tipos de rodas de fric\u00e7\u00e3o e as f\u00f3rmulas deste tipo de mecanismo. O que s\u00e3o rodas de fric\u00e7\u00e3o? Rodas de fric\u00e7\u00e3o s\u00e3o &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/rodas-de-friccao\/\"> <span class=\"screen-reader-text\">Rodas de fric\u00e7\u00e3o<\/span> Leia mais &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","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":"","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":"","footnotes":""},"categories":[10],"tags":[],"class_list":["post-341","post","type-post","status-publish","format-standard","hentry","category-maquinas-e-mecanismos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u25b7 Rodas de fric\u00e7\u00e3o: o que s\u00e3o, tipos, f\u00f3rmula, aplica\u00e7\u00f5es...<\/title>\n<meta name=\"description\" content=\"Aqui voc\u00ea descobrir\u00e1 o que s\u00e3o rodas de fric\u00e7\u00e3o, suas caracter\u00edsticas, f\u00f3rmula, tipos de rodas de fric\u00e7\u00e3o e para que servem.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/physigeek.com\/pt\/rodas-de-friccao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u25b7 Rodas de fric\u00e7\u00e3o: o que s\u00e3o, tipos, f\u00f3rmula, aplica\u00e7\u00f5es...\" \/>\n<meta property=\"og:description\" content=\"Aqui voc\u00ea descobrir\u00e1 o que s\u00e3o rodas de fric\u00e7\u00e3o, suas 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