{"id":1073,"date":"2026-10-09T02:48:06","date_gmt":"2026-10-09T02:48:06","guid":{"rendered":"https:\/\/sun-gears.net\/sun-gear-bore-keyway-spline\/"},"modified":"2026-10-09T05:44:50","modified_gmt":"2026-10-09T05:44:50","slug":"sun-gear-bore-keyway-spline","status":"publish","type":"post","link":"https:\/\/sun-gears.net\/no\/sun-gear-bore-keyway-spline\/","title":{"rendered":"Sun Gear Bore, Keyway or Spline: Interface Choices"},"content":{"rendered":"
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KNOWLEDGE<\/div>\n

Sun Gear Bore, Keyway or Spline: Interface Choices<\/h1>\n

The center interface determines how torque enters the sun gear and how accurately the part stays on the planetary centerline.<\/p>\n

Technical Guide<\/span>Sun Gear<\/span>Planetary Gear<\/span><\/div>\n
Be om et tilbud<\/a>Knowledge Center<\/a><\/div>\n<\/div>\n
\"Sun<\/figure>\n<\/div>\n<\/section>\n
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Why this topic changes the sun gear decision<\/h2>\n<\/div>\n
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The key engineering question is bore, keyway and spline options. The center interface carries torque and also establishes how the sun gear is located relative to bearings, the carrier and the mating planets.<\/p>\n

A dimensionally correct interface can still produce poor tooth contact if it is eccentric to the external gear teeth. Fits and datums therefore belong in the same review as the gear geometry.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Practical design and replacement implications<\/h2>\n<\/div>\n
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For replacement work, measure the mating shaft or hub when possible. Service wear can change spline tooth thickness, keyway condition or bore size and should not be copied into the new drawing.<\/p>\n

For new designs, define engagement length, lead-in features, retention and service access along with the torque requirement.<\/p>\n<\/div>\n

\"Practical<\/figure>\n<\/div>\n<\/div>\n<\/section>\n
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What to control on the RFQ or drawing<\/h2>\n<\/div>\n
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Item<\/th>\nWhat to define<\/th>\n<\/tr>\n<\/thead>\n
Tooth system<\/td>\nTooth count, module\/DP, pressure angle, helix and profile shift\/modification when applicable.<\/td>\n<\/tr>\n
Planetary context<\/td>\nMating planet\/ring data and planet count when available.<\/td>\n<\/tr>\n
Center interface<\/td>\nBore, keyway, spline, hollow center or integrated shaft plus functional datums.<\/td>\n<\/tr>\n
Plikt<\/td>\nRated\/peak torque, speed, reversals\/shock, life, lubrication and environment.<\/td>\n<\/tr>\n
Process<\/td>\nControlled material, heat treatment, finishing and coating requirements.<\/td>\n<\/tr>\n
Acceptance<\/td>\nTooth\/runout\/dimensional inspection and required documentation.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/section>\n
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Frequently asked questions<\/h2>\n<\/div>\n
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\nCan one loose sun gear answer every design question?<\/summary>\n

Usually not. Mating gear data and the center interface provide important cross-checks.<\/p>\n<\/details>\n

\nShould material or tolerance be copied from a similar part?<\/summary>\n

Only when the controlled design allows it. Similar appearance is not proof of the same duty or specification.<\/p>\n<\/details>\n

\nWhat is the fastest way to get a useful quote?<\/summary>\n

Send the latest drawing or measured tooth\/interface data, mating component information, duty, acceptance needs and quantity.<\/p>\n<\/details>\n<\/div>\n<\/div>\n<\/section>\n

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Anbudsforesp\u00f8rsel<\/div>\n

Be om et tilbud \/ Send en foresp\u00f8rsel<\/h2>\n

Send the drawing, mating gear information, center interface, duty, inspection needs and quantity. The article is selection guidance; the approved drawing controls production.<\/p>\n

Send foresp\u00f8rsel<\/a><\/div>\n

MOQ<\/strong>Fleksibel etter produkttype og total ordreverdi.<\/span><\/div>
Pr\u00f8ver<\/strong>Nye kunder kan be om 1\u20135 deler n\u00e5r delen og prosessen passer.<\/span><\/div>
Blandede bestillinger<\/strong>Ulike soldrev eller relaterte planetkomponentmodeller kan kombineres n\u00e5r den totale ordreverdien er rundt USD 1500 eller mer.<\/span><\/div>
Sm\u00e5 bestillinger<\/strong>Bestillinger fra 1-2 stk. kan diskuteres, vanligvis med en h\u00f8yere enhetspris.<\/span><\/div>
Leveranse<\/strong>Standarddeler: 10\u201325 virkedager. Tilpassede komponenter: 20\u201345 virkedager. Prosjektutstyr: 45\u2013120 virkedager.<\/span><\/div>
Handelsvilk\u00e5r<\/strong>EXW, FOB, CIF og DAP st\u00f8ttes vanligvis. FCA, CFR, CPT, CIP og DDP kan diskuteres fra sak til sak.<\/span><\/div><\/div><\/div>\n<\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"

The center interface determines how torque enters the sun gear and how accurately the part stays on the planetary centerline.<\/p>","protected":false},"author":1,"featured_media":1100,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1073","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sun-gears"],"_links":{"self":[{"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/posts\/1073","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/comments?post=1073"}],"version-history":[{"count":1,"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/posts\/1073\/revisions"}],"predecessor-version":[{"id":1119,"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/posts\/1073\/revisions\/1119"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/media\/1100"}],"wp:attachment":[{"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/media?parent=1073"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/categories?post=1073"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sun-gears.net\/no\/wp-json\/wp\/v2\/tags?post=1073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}