{"id":2246,"date":"2023-11-14T12:50:52","date_gmt":"2023-11-14T12:50:52","guid":{"rendered":"https:\/\/www.motointegrator.pt\/blog\/\/?p=2246"},"modified":"2026-07-14T09:36:08","modified_gmt":"2026-07-14T09:36:08","slug":"porque-e-que-o-diferencial-uiva","status":"publish","type":"post","link":"https:\/\/www.motointegrator.pt\/blog\/porque-e-que-o-diferencial-uiva\/","title":{"rendered":"Porque \u00e9 que o diferencial uiva?"},"content":{"rendered":"<p>O diferencial \u00e9 uma engrenagem que se encontra principalmente nos ve\u00edculos de tra\u00e7\u00e3o traseira como diferencial do eixo traseiro. No entanto, tamb\u00e9m pode encontrar em ve\u00edculos todo-o-terreno e nos eixos dianteiros de ve\u00edculos com tra\u00e7\u00e3o \u00e0s quatro rodas. <u>Em geral, o diferencial raramente necessita de repara\u00e7\u00e3o. No entanto, n\u00e3o deve ser negligenciado. <\/u>Se ocorrerem danos, o especialista reconhec\u00ea-los-\u00e1 facilmente. Por outro lado, pode ser dif\u00edcil para os leigos reconhecerem uma falha no diferencial.<\/p>\n<h2>Fun\u00e7\u00e3o do diferencial<\/h2>\n<p>As engrenagens de diferencial ou de eixo s\u00e3o necess\u00e1rias quando um eixo \u00e9 acionado atrav\u00e9s de um eixo cardan. Nos ve\u00edculos de tra\u00e7\u00e3o dianteira, tamb\u00e9m \u00e9 necess\u00e1rio um diferencial, mas neste caso est\u00e1 integrado na caixa de velocidades manual ou autom\u00e1tica, uma vez que a pot\u00eancia \u00e9 transmitida \u00e0s rodas dianteiras diretamente da caixa de velocidades atrav\u00e9s dos <a href=\"\/produtos\/eixos-e-articulacoes-de-transmissao-10405\/\">veios de transmiss\u00e3o<\/a>. Existem dois tipos de diferenciais de eixo:<\/p>\n<ul>\n<li>com veios de transmiss\u00e3o externos<\/li>\n<li>com veios de transmiss\u00e3o internos (veios acoplados)<\/li>\n<\/ul>\n<p>No caso de veios de transmiss\u00e3o internos ou veios acoplados, o bloco diferencial tamb\u00e9m \u00e9 constitu\u00eddo por &#8220;extens\u00f5es&#8221; laterais nas quais os veios acoplados rodam. Desta forma, os veios acoplados tamb\u00e9m recebem \u00f3leo para lubrifica\u00e7\u00e3o.<\/p>\n<h2>Os diferenciais necessitam de manuten\u00e7\u00e3o?<\/h2>\n<p>Desde, pelo menos, o final dos anos 90, os fabricantes de autom\u00f3veis afirmam que o \u00f3leo dos eixos n\u00e3o precisa de ser mudado durante a vida \u00fatil do ve\u00edculo. Do seu ponto de vista, isso pode ser verdade. De facto, a vida \u00fatil de uma caixa de velocidades defeituosa termina a certa altura e o \u00f3leo teria &#8220;durado&#8221; at\u00e9 l\u00e1. No entanto, os fabricantes de autom\u00f3veis partem do princ\u00edpio de que a idade m\u00e9dia m\u00e1xima de um ve\u00edculo se situa entre os oito e os dez anos. Al\u00e9m disso, a quilometragem dos autom\u00f3veis aumentou consideravelmente nas \u00faltimas d\u00e9cadas.<\/p>\n<p>Enquanto h\u00e1 10 ou 15 anos era mais comum os ve\u00edculos desta idade terem uma quilometragem superior a 200.000 km, atualmente este valor normalmente atinge-se ap\u00f3s apenas alguns anos. Este facto tamb\u00e9m aumenta o desgaste do \u00f3leo. Por isso, o n\u00edvel de \u00f3leo nas mudan\u00e7as deve ser verificado regularmente. As mudan\u00e7as de \u00f3leo devem ser efectuadas ap\u00f3s um determinado intervalo de tempo ou de quilometragem, salvo indica\u00e7\u00e3o em contr\u00e1rio. Para muitos ve\u00edculos mais antigos, \u00e9 suficiente um \u00f3leo hipoide (\u00f3leo hidr\u00e1ulico) com uma viscosidade entre SAE 75 e SAE 90. Para os diferenciais autoblocantes, deve ser utilizado um \u00f3leo hipoide especial. Em qualquer caso, o \u00f3leo deve ser aprovado pelo fabricante do ve\u00edculo.<\/p>\n<h2>Porque \u00e9 que o diferencial faz barulho?<\/h2>\n<p>Podem distinguir-se tr\u00eas ru\u00eddos diferentes num diferencial:<\/p>\n<ul>\n<li>um zumbido<\/li>\n<li>um uivo ou assobio<\/li>\n<li>um ru\u00eddo de rangido<\/li>\n<\/ul>\n<p>O zumbido do diferencial indica rolamentos do pinh\u00e3o com defeito. Os ru\u00eddos de uivo ou assobio s\u00e3o mais f\u00e1ceis de identificar. No entanto, podem ter v\u00e1rias causas. Mais uma vez, pode ser um dos rolamentos. Tamb\u00e9m a folga da engrenagem planet\u00e1ria no interior da caixa do diferencial do eixo pode ser a causa. \u00c9 at\u00e9 poss\u00edvel que a caixa de velocidades esteja a funcionar em seco ou quase seco.<\/p>\n<p>Outras causas poss\u00edveis s\u00e3o uma regula\u00e7\u00e3o incorrecta das mudan\u00e7as, rolamentos de roda defeituosos ou pneus de m\u00e1 qualidade no eixo. No entanto, se n\u00e3o for este o caso, deve ser tida em conta a idade do ve\u00edculo, a falta de manuten\u00e7\u00e3o e as condi\u00e7\u00f5es de utiliza\u00e7\u00e3o. Se o assobio ou o rangido do diferencial come\u00e7arem ap\u00f3s uma mudan\u00e7a de \u00f3leo, a causa pode ser um \u00f3leo mau ou uma viscosidade incorrecta do \u00f3leo.<\/p>\n<p>O mais perigoso \u00e9 o ru\u00eddo de rangido, pois pode significar que introduziram-se aparas de metal entre as engrenagens. Isto, por sua vez, indica um n\u00edvel de abras\u00e3o bastante elevado, pelo que as engrenagens planet\u00e1rias t\u00eam de ser substitu\u00eddas.<\/p>\n<div class=\"product-slider\" style=\"--swiper-theme-color: #d80812;--swiper-navigation-size: 22px;--swiper-navigation-sides-offset: -25px;\"><div class=\"slider-title\"><svg id=\"fi_9219671\" enable-background=\"new 0 0 64 64\" height=\"512\" viewBox=\"0 0 64 64\" width=\"512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><g><g><path d=\"m25.308 61.679c-3.514 0-6.373-2.859-6.373-6.373s2.859-6.372 6.373-6.372 6.373 2.858 6.373 6.372-2.859 6.373-6.373 6.373zm0-8.745c-1.308 0-2.373 1.064-2.373 2.372 0 1.309 1.064 2.373 2.373 2.373s2.373-1.064 2.373-2.373c0-1.308-1.064-2.372-2.373-2.372z\"><\/path><path d=\"m47.462 61.679c-3.514 0-6.372-2.859-6.372-6.373s2.858-6.372 6.372-6.372 6.373 2.858 6.373 6.372-2.86 6.373-6.373 6.373zm0-8.745c-1.308 0-2.372 1.064-2.372 2.372 0 1.309 1.064 2.373 2.372 2.373 1.309 0 2.373-1.064 2.373-2.373 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class=\"swiper-button-prev\"><\/div><div class=\"swiper-button-next\"><\/div><\/div><\/div>\n<h2>Quais s\u00e3o as consequ\u00eancias destas defici\u00eancias?<\/h2>\n<p>\u00c9 t\u00e3o dif\u00edcil de prever como de identificar claramente a avaria sem conhecimentos t\u00e9cnicos e um teste efectuado por um mec\u00e2nico competente. \u00c9 de notar que, nos ve\u00edculos novos, algumas transmiss\u00f5es de veios j\u00e1 come\u00e7am a uivar. Neste caso, \u00e9 frequente tentar reajustar a caixa de velocidades, mas sem sucesso. Este ru\u00eddo de uivo ou assobio pode durar v\u00e1rias centenas de milhares de quil\u00f3metros sem danos significativos para o diferencial. Em qualquer caso, a veda\u00e7\u00e3o do veio e os rolamentos (folga dos rolamentos) devem ser verificados.<\/p>\n<p>N\u00e3o \u00e9 necess\u00e1rio substituir imediatamente os an\u00e9is de veda\u00e7\u00e3o (Simmerring) se a caixa de velocidades estiver simplesmente a &#8220;suar&#8221;. No entanto, se se formarem grandes gotas de \u00f3leo, a perda de \u00f3leo tamb\u00e9m \u00e9 elevada e os vedantes devem ser substitu\u00eddos com urg\u00eancia. Se a folga for demasiado grande, as engrenagens t\u00eam de ser substitu\u00eddas. No entanto, isto \u00e9 relativamente caro. Se a folga aumentar, pode ocorrer um ru\u00eddo de batida ao arrancar ou ao mudar de velocidade. Em geral, pode-se limitar o ru\u00eddo de assobio ou rangido atrav\u00e9s da mudan\u00e7a de velocidades. Se o n\u00edvel de \u00f3leo estiver correto e o ru\u00eddo de batida acima mencionado for acompanhado por um ru\u00eddo sibilante, isso significa que a folga numa das engrenagens ou num rolamento est\u00e1 a aumentar.<\/p>\n<h3>Repara\u00e7\u00e3o do diferencial<\/h3>\n<p>S\u00e3o necess\u00e1rias v\u00e1rias ferramentas especiais para a repara\u00e7\u00e3o. Trata-se, por exemplo, de ferramentas para retirar os rolamentos e de calibres para ajustar a folga. Tal como acontece com a caixa de velocidades, a repara\u00e7\u00e3o deve efectuar um especialista. No entanto, pode obter pe\u00e7as sobressalentes baratas, kits de veda\u00e7\u00e3o e outros componentes para o diferencial do eixo do seu ve\u00edculo, de forma econ\u00f3mica e com qualidade de equipamento original, na nossa extensa loja de pe\u00e7as autom\u00f3veis online.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O diferencial \u00e9 uma engrenagem que se encontra principalmente nos ve\u00edculos de tra\u00e7\u00e3o traseira como diferencial do eixo traseiro. No entanto, tamb\u00e9m pode encontrar em ve\u00edculos todo-o-terreno e nos eixos dianteiros de ve\u00edculos com tra\u00e7\u00e3o \u00e0s quatro rodas. Em geral, o diferencial raramente necessita de repara\u00e7\u00e3o. No entanto, n\u00e3o deve ser negligenciado. Se ocorrerem danos, [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":15651,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3294,641,451],"tags":[3328,3332,3334,3333,3329,3330,3336,3335,3331],"class_list":["post-2246","post","type-post","status-publish","format-standard","has-post-thumbnail","category-automovel","category-carrossel","category-engrenagem-diferencial","tag-caixa-de-velocidades-a-uivar","tag-diferencial-automovel-com-defeito","tag-diferencial-defeituoso","tag-diferencial-ruido-automovel","tag-engrenagem-diferencial","tag-ruido-diferencial","tag-ruido-no-diferencial","tag-sintomas-de-defeito-do-diferencial","tag-sintomas-de-diferencial-defeituoso"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Engrenagem do diferencial: porque \u00e9 que uiva?<\/title>\n<meta name=\"description\" content=\"Na maioria dos ve\u00edculos, a engrenagem do diferencial nunca ser\u00e1 motivo de repara\u00e7\u00e3o. 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