{"id":14213,"date":"2025-01-21T16:00:44","date_gmt":"2025-01-21T15:00:44","guid":{"rendered":"https:\/\/www.idolz.com\/?p=14213"},"modified":"2025-12-02T08:56:23","modified_gmt":"2025-12-02T07:56:23","slug":"how-it-works-alternator-pulley","status":"publish","type":"post","link":"https:\/\/www.idolz.com\/en\/how-it-works-alternator-pulley\/","title":{"rendered":"How it works: Alternator pulley"},"content":{"rendered":"<p>An <strong><a href=\"https:\/\/www.idolz.com\/en\/dolz-enlarges-its-product-mix-by-adding-the-new-alternator-pulleys-range\/\" target=\"_blank\" rel=\"noopener\">overrunning alternator pulley<\/a> (OAP)<\/strong> can play an important part in the smooth running of the modern <strong>internal combustion (IC) engine.<\/strong>\u00a0Today, more and more vehicle manufacturers design the belt drive systems with these pulleys because of the <strong>torsional vibrations<\/strong> produced in modern engines (specially on diesel applications).<\/p>\n<p>Let\u2019s dive into\u00a0this crucial component in modern vehicles and get a comprehensive overview of what a<strong> car alternator<\/strong> is, exactly how an alternator pulley works and what are the main types.<\/p>\n<p>&nbsp;<\/p>\n<h2>What is a car alternator?<\/h2>\n<p>&nbsp;<\/p>\n<p>With the battery and the voltage regulator, the <strong>alternator<\/strong> is one of the three <strong>major components needed<\/strong> to generate <strong>power <\/strong>for the electrical components.<\/p>\n<p>Its primary role is to<strong> convert mechanical energy <\/strong>from the engine<strong> into electrical energy.<\/strong> It is connected to the engine by a belt, so when the car is running the alternator generates, by using a rotating magnetic field, the electrical power to feed the system and charge the battery of the car.<\/p>\n<p>Alternator has many different components, and each has their own dedicated function. Among the <strong>three major components<\/strong> are:<\/p>\n<ul>\n<li>Rotor<\/li>\n<li>Stator<\/li>\n<li>Rectifier (several diodes)<\/li>\n<\/ul>\n<p>Besides these key components the <strong>automotive alternator<\/strong> also includes a voltage regulator and an alternator pulley.<\/p>\n<p>&nbsp;<\/p>\n<p><img class=\"aligncenter wp-image-14221 \" src=\"https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator-1024x683.png\" alt=\"car alternator\" width=\"864\" height=\"576\" srcset=\"https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator-200x133.png 200w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator-300x200.png 300w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator-400x267.png 400w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator-600x400.png 600w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator-768x512.png 768w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator-800x533.png 800w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator-1024x683.png 1024w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/12\/Elements-alternator.png 1200w\" sizes=\"(max-width: 864px) 100vw, 864px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2>How alternator pulley works<\/h2>\n<p>&nbsp;<\/p>\n<p>With the ever-increasing number of <strong>auxiliary systems<\/strong> that require more powerful alternators and, since the alternator contributes to the fuel consumption the increasing requirements on emissions have started an interest in developing <strong>alternator pulleys<\/strong> to deal with engine torsional fluctuations.<\/p>\n<p>An alternator pulley is a device that allows a vehicle&#8217;s alternator to be turned by a belt, which is driven off of the engine&#8217;s accessory drive system. That is, <strong>when the engine remains idle, it remains at enough speed<\/strong> to produce sufficient power for maintaining the battery&#8217;s charge.<\/p>\n<p>Today, an increasing proportion of cars are equipped with Overrunning Alternator Pulleys (OAP).<\/p>\n<p>&nbsp;<\/p>\n<blockquote>\n<p style=\"text-align: center;\"><em>Related content: <\/em><a href=\"https:\/\/www.idolz.com\/en\/quick-guide-to-front-end-accessory-drive-system-performance\/\" target=\"_blank\" rel=\"noopener\"><em>Quick Guide: FEAD system performance<\/em><\/a><\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<h3>Types of alternator pulleys<\/h3>\n<p>&nbsp;<\/p>\n<p>There are 3 major types of alternators pulley: solid pulley, OAP and OAD<strong>\u2122<\/strong>.<\/p>\n<ul>\n<li><strong>Solid Alternator Pulley<\/strong>: It used to be the automotive industry standard during many years, evolving from the <a href=\"https:\/\/www.idolz.com\/en\/understanding-the-water-pump-drive-exploring-its-location-and-operation\/\" target=\"_blank\" rel=\"noopener\">V-belt type<\/a> to the <a href=\"https:\/\/www.idolz.com\/en\/car-auxiliary-drive-belt\/\" target=\"_blank\" rel=\"noopener\">poly-V type<\/a>. The only function of the Solid Pulley is to<strong> drive the alternator.<\/strong> And unlike the other pulleys, <strong>it does not incorporate a protective cap<\/strong>.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>OAP<\/strong>: The Overrunning Alternator Pulley,\u00a0or &#8220;one-way clutch\u201d,<strong> allows the alternator to wheel freely when the drive belt speed is suddenly decreased<\/strong>. That is, allows the rotor of the alternator to coast to a stop when the engine is shut down. This \u201coverrunning\u201d feature eliminates chirping sounds that happen during engine shutdown quickly causing the belt to slip at the alternator pulley.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>OAD\u2122<\/strong>: The <a href=\"https:\/\/www.litens.com\/\" target=\"_blank\" rel=\"noopener\">Litens OAD<strong>\u2122<\/strong><\/a> not only has a one-way clutch inside, <strong>it also incorporates a patented internal spring mechanism <\/strong>(a torsion spring) <strong>required to absorb energy<\/strong>. Its design is tuned (engine specific) to absorb base engine vibrations (cylinder firing pulses) before they reach the alternator rotor and therefore negatively affect the accessory drive.<\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\">Among its main <strong>benefits<\/strong>, there are:<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\n<li>Less tensioner motion<\/li>\n<li>Improves engine feel by reducing NVH<\/li>\n<li>More robust accessory drive.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p style=\"padding-left: 40px;\">In other words, the different parts of the system as the alternator, the <a href=\"https:\/\/www.idolz.com\/en\/water-pumps\/\" target=\"_blank\" rel=\"noopener\">water pump<\/a> or other accessories bearings will last much longer.<\/p>\n<p>With that being said, as these pulley types are not interchangeable,\u00a0it is very important <strong>only to use the pulley type that the vehicle was originally equipped with<\/strong>. Always replace the OE pulley technology with the same Aftermarket technology.<\/p>\n<p>&nbsp;<\/p>\n<h2>DOLZ Leading range of OAPs and OAD\u2019s\u2122<\/h2>\n<p>&nbsp;<\/p>\n<p>We are continuously engaged in the development of innovative products to provide our global customer base with the necessary parts for timely and professional repairs.<\/p>\n<p><img class=\"size-medium wp-image-14032 aligncenter\" src=\"https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-211x300.jpg\" alt=\"\" width=\"211\" height=\"300\" srcset=\"https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-200x285.jpg 200w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-211x300.jpg 211w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-400x570.jpg 400w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-600x855.jpg 600w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-719x1024.jpg 719w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-768x1094.jpg 768w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-800x1139.jpg 800w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-1079x1536.jpg 1079w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS-1200x1709.jpg 1200w, https:\/\/www.idolz.com\/wp-content\/uploads\/2023\/10\/DOLZ-LITENS.jpg 1438w\" sizes=\"(max-width: 211px) 100vw, 211px\" \/><\/p>\n<blockquote>\n<p style=\"text-align: center;\"><em>New to Range<\/em><em>: <\/em><a href=\"https:\/\/www.idolz.com\/en\/dolz-enlarges-its-product-mix-by-adding-the-new-alternator-pulleys-range\/\" target=\"_blank\" rel=\"noopener\"><em>270+ DOLZ Alternator Pulleys<\/em><\/a><\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<p>With a comprehensive<strong> portfolio featuring over 270 references, <a href=\"https:\/\/www.idolz.com\/en\/\" target=\"_blank\" rel=\"noopener\">DOLZ<\/a><\/strong> offers a full range that includes both cutting-edge technologies available in the market: OAP pulleys (Overrunning Alternator Pulley) and OAD\u2122 pulleys (Overrunning Alternator Decoupler). <b>Our product range:<\/b><\/p>\n<ul>\n<li><a href=\"https:\/\/www.idolz.com\/en\/water-pumps\/\" target=\"_blank\" rel=\"noopener\">Water pumps<\/a><\/li>\n<li><a href=\"https:\/\/www.idolz.com\/en\/timing-belt-kits\/\" target=\"_blank\" rel=\"noopener\">Timing Drive Kits<\/a><\/li>\n<li>Alternator Pulleys<\/li>\n<li><a href=\"https:\/\/www.idolz.com\/en\/thermostats\/\" target=\"_blank\" rel=\"noopener\">Thermostats<\/a><\/li>\n<\/ul>\n<p>Selecting the best supplier is a must. Do not hesitate to <strong><a href=\"https:\/\/www.idolz.com\/en\/contact\/\" target=\"_blank\" rel=\"noopener\">contact us<\/a> <\/strong>if you have any questions or need further information about our product lines, commercial details, or technical specifications (including replacement guidelines)<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/www.idolz.com\/wp-content\/uploads\/2025\/01\/EN-DOLZ-New-To-Range-December-25.pdf\">Before you go, don&#8217;t miss out! Download this month&#8217;s New-To-Range with<\/a> over 33 fresh references\u2013 just one click away!<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.idolz.com\/en\/contact\/\" target=\"_blank\" rel=\"noopener\"><img class=\"aligncenter wp-image-5679 size-full\" src=\"https:\/\/www.idolz.com\/wp-content\/uploads\/2021\/04\/CTA-BLOG-Contacto-EN.jpg\" alt=\"Contact us\" width=\"800\" height=\"300\" srcset=\"https:\/\/www.idolz.com\/wp-content\/uploads\/2021\/04\/CTA-BLOG-Contacto-EN-200x75.jpg 200w, https:\/\/www.idolz.com\/wp-content\/uploads\/2021\/04\/CTA-BLOG-Contacto-EN-300x113.jpg 300w, https:\/\/www.idolz.com\/wp-content\/uploads\/2021\/04\/CTA-BLOG-Contacto-EN-400x150.jpg 400w, https:\/\/www.idolz.com\/wp-content\/uploads\/2021\/04\/CTA-BLOG-Contacto-EN-600x225.jpg 600w, https:\/\/www.idolz.com\/wp-content\/uploads\/2021\/04\/CTA-BLOG-Contacto-EN-768x288.jpg 768w, https:\/\/www.idolz.com\/wp-content\/uploads\/2021\/04\/CTA-BLOG-Contacto-EN.jpg 800w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>An overrunning alternator pulley (OAP) can play an important part [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":14214,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[412],"tags":[415,416],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v16.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How it works: Alternator pulley Alternator Pulley | Industrias Dolz<\/title>\n<meta name=\"description\" content=\"In what follows, you&#039;ll see what a car alternator is, exactly how an alternator pulley works and what are the main types.\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.idolz.com\/en\/how-it-works-alternator-pulley\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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