{"id":71719,"date":"2026-07-21T08:22:46","date_gmt":"2026-07-21T06:22:46","guid":{"rendered":"https:\/\/www.km77.com\/revista\/?p=71719"},"modified":"2026-07-21T08:22:54","modified_gmt":"2026-07-21T06:22:54","slug":"motivo-coches-sin-limpiaparabrisas-trasero","status":"publish","type":"post","link":"https:\/\/www.km77.com\/revista\/engendro-mecanico\/motivo-coches-sin-limpiaparabrisas-trasero\/","title":{"rendered":"Por qu\u00e9 algunos coches no llevan limpiaparabrisas trasero"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Al fijarse en el parque automovil\u00edstico actual, llama la atenci\u00f3n un detalle de equipamiento que parece distribuirse de forma asim\u00e9trica entre los diferentes segmentos del mercado.&nbsp;Mientras que la pr\u00e1ctica totalidad de los veh\u00edculos de tipo SUV, compactos y familiares cuentan con un brazo limpiaparabrisas en la luneta trasera, <strong>las berlinas tradicionales de tres vol\u00famenes <\/strong>(con maletero separado) prescinden por completo de este elemento. A primera vista, un conductor podr\u00eda interpretar esta omisi\u00f3n como un simple ahorro de costes por parte de los fabricantes o como un peaje est\u00e9tico para no romper la fluidez de las l\u00edneas de la zaga.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sin embargo, la realidad es que esta decisi\u00f3n responde directamente a las leyes de la aerodin\u00e1mica.\u00a0No es que las berlinas no necesiten limpiar su cristal trasero por capricho, sino que, debido a su fisonom\u00eda, <strong>el propio flujo del aire<\/strong> ayuda a mantener la luneta libre de agua y suciedad durante la marcha.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ca\u00edda del techo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Para comprender por qu\u00e9 un SUV o un compacto requiere obligatoriamente un limpialuneta, hay que examinar c\u00f3mo se comporta la corriente de aire cuando el veh\u00edculo rueda a alta velocidad.&nbsp;En los coches con un dise\u00f1o de dos vol\u00famenes (donde el techo termina de forma abrupta y vertical en el port\u00f3n trasero), el flujo de aire que recorre la carrocer\u00eda <strong>se corta de golpe<\/strong> al llegar al final del techo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esta interrupci\u00f3n dr\u00e1stica de las l\u00edneas de flujo genera una zona de baja presi\u00f3n inmediatamente detr\u00e1s del veh\u00edculo, lo que en din\u00e1mica de fluidos se conoce como una <strong>zona de succi\u00f3n o vac\u00edo aerodin\u00e1mico<\/strong>. Este vac\u00edo aspira las corrientes de aire turbulentas que provienen de los bajos del coche y de los laterales. Al circular sobre asfalto mojado, este remolino posterior succiona de forma constante el agua pulverizada, el holl\u00edn de los escapes, el polvo y la suciedad de la carretera, incrust\u00e1ndolos directamente sobre la superficie de la luneta trasera. Sin un brazo mec\u00e1nico y un sistema de lavado dedicado, la visibilidad hacia atr\u00e1s quedar\u00eda anulada en pocos kil\u00f3metros de conducci\u00f3n lluviosa.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.km77.com\/revista\/wp-content\/uploads\/2026\/07\/full-1024x683.jpg\" alt=\"\" class=\"wp-image-71730\" srcset=\"https:\/\/www.km77.com\/revista\/wp-content\/uploads\/2026\/07\/full-1024x683.jpg 1024w, https:\/\/www.km77.com\/revista\/wp-content\/uploads\/2026\/07\/full-980x653.jpg 980w, https:\/\/www.km77.com\/revista\/wp-content\/uploads\/2026\/07\/full-480x320.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><figcaption class=\"wp-element-caption\">Mercedes-AMG CLA 45 4MATIC+. Imagen de km77<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Autolimpieza aerodin\u00e1mica<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">El escenario f\u00edsico cambia por completo al analizar la silueta de una berlina cl\u00e1sica de tres vol\u00famenes.\u00a0En estos veh\u00edculos, el aire que fluye por el techo no se desprende de forma ca\u00f3tica, sino que <strong>acompa\u00f1a suavemente la sutil curvatura<\/strong> <strong>descendente<\/strong> de la luneta trasera hacia el tercer volumen (la tapa del maletero). Este dise\u00f1o permite que el flujo de aire permanezca pegado a la superficie del cristal durante m\u00e1s tiempo, barriendo y empujando de forma pasiva las gotas de lluvia gracias a la propia velocidad del coche.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La zona de baja presi\u00f3n y el consiguiente remolino de succi\u00f3n que levanta la suciedad del asfalto tambi\u00e9n existen en las berlinas, pero <strong>se desplazan por completo hacia atr\u00e1s<\/strong>, localiz\u00e1ndose exclusivamente en la pared vertical del paragolpes y los pilotos traseros, lejos de la zona acristalada.\u00a0Al no existir un vac\u00edo tan grande sobre la luneta, el agua sucia pulverizada por las ruedas traseras <strong>es menos probable que termine arremolinarse<\/strong> contra el cristal.\u00a0Por tanto, a\u00f1adir un motor el\u00e9ctrico, un brazo mec\u00e1nico y un surtidor en esa zona no aporta demasiado valor (al menos a velocidades altas) y penaliza ligeramente la aerodin\u00e1mica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Al fijarse en el parque automovil\u00edstico actual, llama la atenci\u00f3n un detalle de equipamiento que parece distribuirse de forma asim\u00e9trica entre los diferentes segmentos del mercado.&nbsp;Mientras que la pr\u00e1ctica totalidad de los veh\u00edculos de tipo SUV, compactos y familiares cuentan con un brazo limpiaparabrisas en la luneta trasera, las berlinas tradicionales de tres vol\u00famenes (con [&hellip;]<\/p>\n","protected":false},"author":93,"featured_media":71777,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[3912],"tags":[7975,22],"class_list":["post-71719","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engendro-mecanico","tag-de-todo-un-poco","tag-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Por qu\u00e9 algunos coches no llevan limpiaparabrisas trasero<\/title>\n<meta name=\"description\" content=\"Analizamos los fundamentos de la din\u00e1mica de fluidos que determinan la ausencia del limpiaparabrisas trasero en las berlinas de tres vol\u00famenes frente a su obligatoriedad t\u00e9cnica en los SUV y compactos.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.km77.com\/revista\/engendro-mecanico\/motivo-coches-sin-limpiaparabrisas-trasero\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Por qu\u00e9 algunos coches no llevan limpiaparabrisas trasero\" \/>\n<meta property=\"og:description\" content=\"Analizamos los fundamentos de la din\u00e1mica de fluidos que determinan la ausencia del limpiaparabrisas trasero en las berlinas de tres vol\u00famenes frente a su obligatoriedad t\u00e9cnica en los SUV y compactos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.km77.com\/revista\/engendro-mecanico\/motivo-coches-sin-limpiaparabrisas-trasero\/\" \/>\n<meta property=\"og:site_name\" content=\"Revista km77\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-21T06:22:46+00:00\" \/>\n<meta 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