{"id":486475,"date":"2024-11-05T12:13:49","date_gmt":"2024-11-05T12:13:49","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/agma-940-a09\/"},"modified":"2024-11-05T12:13:49","modified_gmt":"2024-11-05T12:13:49","slug":"agma-940-a09","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/agma\/agma-940-a09\/","title":{"rendered":"AGMA 940-A09"},"content":{"rendered":"<p>\n<u><strong>SCOPE<\/strong><\/u><\/p>\n<p>\tThis information sheet provides specific design considerations for epicyclic gear drives which use double helical gearing.\u00a0 Double helical epicyclic gear units have special concerns and complexities in their design, manufacturing and assembly.\u00a0 These include:<\/p>\n<ul>\n<li>\n<p>\t\tassembly protocols of the gear elements;<\/li>\n<li>\n<p>\t\tapex runout, sometimes referred to as axial runout or apex wobble;<\/li>\n<li>\n<p>\t\teffects which influence gear face load distribution;<\/li>\n<li>\n<p>\t\tspecial considerations for load sharing;<\/li>\n<li>\n<p>\t\tspecial considerations applicable to floating ring designs.<\/li>\n<\/ul>\n<p>\tDouble helical epicyclic gear units with pitchline velocities in excess of 35 meters per second and aircraft propulsion gears are excluded.<\/p>\n<p>\tThis information sheet is a supplement to ANSI\/AGMA 6123-B06 covering design issues of double helical epicyclic units which are not covered in that standard.<\/p>\n<p>\n<u><strong>FOREWORD<\/strong><\/u><\/p>\n<p>\t[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of AGMA Information Sheet 940-A09, <em>Double Helical Epicyclic Gear Units<\/em>.]<\/p>\n<p>\tThe purpose of this information sheet is to provide specification, comparison and design data for double helical epicyclic gear units as a supplement to ANSI\/AGMA 6123-B06, <em>Design Manual for Enclosed Epicyclic Gear Drives<\/em>.\u00a0 While the scope of ANSI\/AGMA 6123-B06 includes only spur and single helical epicyclic drives, a significant portion of the material presented is applicable to the double helical configuration and will be referenced by this information sheet.<\/p>\n<p>\tThe double helical epicyclic configuration is generally used when it is desired to maximize power density.\u00a0 This information sheet will discuss the considerations and complexities of the double helical epicyclics which include application, arrangements, meshing\/assembly, load sharing, lubrication and components (gearing, bearings, splines and carriers).<\/p>\n<p>\tThe formulas presented or referenced in this information sheet contain numerous terms whose individual values can vary significantly depending on application, system effects, accuracy and manufacturing methods.\u00a0 Proper evaluation of these terms is essential for realistic rating.\u00a0 The knowledge and judgment required to properly evaluate the various rating factors comes primarily from years of accumulated experience in designing, testing, manufacturing and operating similar gear units.\u00a0 The detailed treatment of the general rating formulas for specific product applications is best accomplished by those experienced in the field.<\/p>\n<p>\tThis information sheet is dedicated to Don McVittie. His participation and inspiration led to the development of this information sheet.\u00a0 Mr. McVittie was the first Chairman of the Epicyclic Enclosed Drives Committee.\u00a0 His thoroughness and enthusiasm for gearing, along with his contributions, as well as the contributions of his fellow committee members brought out the best information from the committee as a whole.<\/p>\n<p>\tThe first draft of AGMA 940-A09 was made in May, 2005.\u00a0 It was approved by the AGMA Technical Division Executive Committee in January, 2009.<\/p>\n<p>\tSuggestions for improvement of this document will be welcome.\u00a0 They should be sent to the American Gear Manufacturers Association, 1001 N. Fairfax Street, 5th Floor, Alexandria, Virginia\u00a0 22314.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Double Helical Epicyclic Gear Units<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/agma\/\"><b>AGMA<\/b><\/a><\/td>\n<td>2009<\/td>\n<td>29<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":486486,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2659],"product_tag":[],"class_list":{"0":"post-486475","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-agma","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/486475","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/486486"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=486475"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=486475"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=486475"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}