{"id":7144,"date":"2019-10-15T11:06:31","date_gmt":"2019-10-15T09:06:31","guid":{"rendered":"https:\/\/www.apexdyna.nl\/?p=7144"},"modified":"2019-10-15T11:06:31","modified_gmt":"2019-10-15T09:06:31","slug":"pinion-with-curvic-plate-coupling","status":"publish","type":"post","link":"https:\/\/www.apexdyna.nl\/en\/news\/pinion-with-curvic-plate-coupling","title":{"rendered":"Pinion with Curvic Plate coupling"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-6966\" src=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Concave-Teeth-300x211.png\" alt=\"\" width=\"300\" height=\"211\" srcset=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Concave-Teeth-300x211.png 300w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Concave-Teeth-150x106.png 150w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Concave-Teeth.png 352w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>Why would you use a pinion with a Curvic plate coupling? This type of coupling for high-end pinions offers a number of significant advantages and has been introduced by Apex Dynamics. We would like to give some attention to this superior coupling and explain the different types in this article.<\/p>\n<p><!--more--><\/p>\n<p>Apex Dynamics introduced pinions with a Curvic coupling in 2016 in response to a clear market demand. The main reasons for this development were :<\/p>\n<ul>\n<li>in order to be able (always) to change the pinion of the drive afterwards (FLEXIBILITY),,<\/li>\n<li>to have a backlash-free, centered connection (ACCURACY), and<\/li>\n<li>to have about 20 teeth on the pinion (LOADABILITY).<\/li>\n<\/ul>\n<h2>Specifications Curvic plate coupling<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-6965\" src=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Concave-Convex-300x125.png\" alt=\"\" width=\"300\" height=\"125\" srcset=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Concave-Convex-300x125.png 300w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Concave-Convex-150x63.png 150w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Concave-Convex.png 388w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>The teeth of the pinion are convex ground (barrel-shaped) while the base plate (or APC High Torque flange) are concave ground (hourglass-shaped). That is for an optimal connection and even distribution of the load between the parts.<\/p>\n<p>But if it brings such large benefits, why don&#8217;t we see this type of coupling more often?<br \/>\nThe main reasons for this are that high-quality machines, high-quality materials and highly trained personnel are required to produce a good Curvic coupling. We therefore see these couplings in demanding markets such as aerospace and energy plants.<\/p>\n<h2>The origin of the Curvic plate coupling<\/h2>\n<p>The principle of this coupling was invented by the very successful German engineer Albert Hirth (1858 &#8211; 1935). He started the companies Norma Compagnie GmbH (ball bearings, later taken over by SKF), Fortuna Werke (packaging machines) and KACO (Seals for the automotive), in addition to his Hirth AG (camshafts and gears). In his life he applied for more than 350 patents and was therefore called the &#8220;Swabian Edison&#8221;. At the age of 73 he applied for a patent for a &#8220;four-color pen with one-hand operation&#8221;. Don&#8217;t we all know that one?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-7136\" src=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/P54-Mustang-300x197.jpg\" alt=\"\" width=\"300\" height=\"197\" srcset=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/P54-Mustang-300x197.jpg 300w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/P54-Mustang-150x99.jpg 150w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/P54-Mustang-600x394.jpg 600w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/P54-Mustang.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>Now, 100 years later, the names Hirth-Minimeter and Hirth-coupling are still known! The principle of the Hirth coupling was picked up by an American manufacturer of gearboxes, it was improved and renamed Curvic coupling. Curvic couplings were first mass-produced in 1942 to meet the need for couplings that require extreme accuracy and maximum load capacity, along with a high production speed. The outbreak of World War II accelerated the introduction and the number of applications. For example: the crankshafts and turbines of the P54 Mustang or B29, among others, were equipped with curvic couplings.<\/p>\n<p>The development of the Curvic coupling stems directly from the production of spiral conical gears, which were made on the same machines and with similar production methods. The term &#8220;Curvic&#8221; refers to cams on a circle that have a characteristic curved shape when viewed perpendicular to the coupling.<\/p>\n<p>The three basic types of Curvic couplings are<\/p>\n<ul>\n<li>fixed Curvic coupling<\/li>\n<li>semi-universal\u00a0coupling<\/li>\n<li>disconnect coupling<\/li>\n<\/ul>\n<p>In all cases, this type of coupling offers good precision centering, a high load-bearing capacity and it is free of backlash.<\/p>\n<h2>Fixed Curvic plate couplings<\/h2>\n<p>The fixed Curvic coupling is a high-precision rigid connection of two elements. The fixed Curvic coupling is widely used in the construction of built-up turbine and compressor blades for air and space crafts and industrial gas-steam turbines. Crankshafts can be made from individual, interchangeable parts through this coupling. The fixed Curvic coupling is also used by many large machine manufacturers for precision indexing mechanisms.<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 33.3333%; text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6968\" src=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_1-277x250.png\" alt=\"\" width=\"166\" height=\"150\" srcset=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_1-277x250.png 277w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_1-138x125.png 138w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_1-554x500.png 554w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_1.png 651w\" sizes=\"auto, (max-width: 166px) 100vw, 166px\" \/><\/td>\n<td style=\"width: 33.3333%; text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6969\" src=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_2-300x250.png\" alt=\"\" width=\"179\" height=\"150\" srcset=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_2-300x250.png 300w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_2-150x125.png 150w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_2.png 558w\" sizes=\"auto, (max-width: 179px) 100vw, 179px\" \/><\/td>\n<td style=\"width: 33.3333%; text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6970\" src=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_3-226x250.png\" alt=\"\" width=\"136\" height=\"150\" srcset=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_3-226x250.png 226w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_3-113x125.png 113w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_3-452x500.png 452w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Curvic-precissie_3.png 566w\" sizes=\"auto, (max-width: 136px) 100vw, 136px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Semi-universal curvic plate couplings<\/h2>\n<p>The semi-universal coupling is also a precision coupling but is loosely coupled to allow a maximum of 2 degrees of skew of axes together with an axial play. The teeth of one part usually have a curved profile to keep the load centered and to transmit an almost uniform movement.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6971 aligncenter\" src=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Semi-universele-curvic-plate-koppelingen-300x242.png\" alt=\"\" width=\"300\" height=\"242\" srcset=\"https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Semi-universele-curvic-plate-koppelingen-300x242.png 300w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Semi-universele-curvic-plate-koppelingen-150x121.png 150w, https:\/\/www.apexdyna.nl\/wp-content\/uploads\/Semi-universele-curvic-plate-koppelingen.png 552w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<h2>Curvic plate disconnect coupling<\/h2>\n<p>The decoupling couplings are designed and made in such a way that the correct &#8216;tooth contact&#8217; is maintained while the coupling switches on and off. In the larger sizes, a spiral-shaped surface is used to achieve this. For small couplings, this action is approached by a specially located tooth bearing. The two parts of a switch or overload coupling are usually held in place by spring pressure. Switch couplings are nowadays used in a large number of applications, including cars, agricultural machines and tool changers. Couplings can be produced by sawing or grinding, depending on the required accuracy.<\/p>\n<p>For more information about Curvic-plate pinions, <a href=\"https:\/\/www.apexdyna.nl\/en\/contact\/\">please contact Apex Dynamics<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why would you use a pinion with a Curvic plate coupling? This type of coupling for high-end pinions offers a number of significant advantages and has been introduced by Apex Dynamics. We would like to give some attention to this superior coupling and explain the different types in this article.<\/p>\n","protected":false},"author":5,"featured_media":6966,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11],"tags":[],"class_list":["post-7144","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pinion with Curvic Plate coupling for high-precision applications<\/title>\n<meta name=\"description\" content=\"There are 3 versions of the Curvic coupling for high-precision applications, we discuss the benefits and why considering this special design.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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