{"id":1081,"date":"2026-10-09T02:48:49","date_gmt":"2026-10-09T02:48:49","guid":{"rendered":"https:\/\/sun-gears.net\/sun-gear-failure-modes\/"},"modified":"2026-10-09T06:53:30","modified_gmt":"2026-10-09T06:53:30","slug":"sun-gear-failure-modes","status":"publish","type":"post","link":"https:\/\/sun-gears.net\/ar\/sun-gear-failure-modes\/","title":{"rendered":"Sun Gear Failure Modes: Pitting, Scuffing and Tooth Breakage"},"content":{"rendered":"
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Sun Gear Failure Modes: Pitting, Scuffing and Tooth Breakage<\/h1>\n

Sun gear damage is evidence about the whole planetary stage. Replacing the center gear without finding the cause can lead to repeat failure.<\/p>\n

Technical Guide<\/span>Sun Gear<\/span>Planetary Gear<\/span><\/div>\n
\u0627\u0637\u0644\u0628 \u0639\u0631\u0636 \u0633\u0639\u0631<\/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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When the issue is pitting, scuffing and tooth breakage, inspect the entire planetary stage before ordering a single replacement. The sun, planets, ring, bearings, carrier and lubrication system share the same load path.<\/p>\n

Damage pattern, oil condition and circumferential repetition can help distinguish overload, alignment, lubrication and surface-fatigue problems.<\/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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A new gear should preserve the approved tooth and interface geometry unless a controlled redesign is intended. Increasing hardness or changing backlash without diagnosing the root cause can create a different failure.<\/p>\n

Record damaged and unworn regions separately when reverse measuring the part.<\/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
\n\n\n\n\n\n\n\n\n\n\n
\u063a\u0631\u0636<\/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
\u0648\u0627\u062c\u0628<\/td>\nRated\/peak torque, speed, reversals\/shock, life, lubrication and environment.<\/td>\n<\/tr>\n
\u0639\u0645\u0644\u064a\u0629<\/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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\u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631<\/div>\n

\u0637\u0644\u0628 \u0639\u0631\u0636 \u0633\u0639\u0631 \/ \u0625\u0631\u0633\u0627\u0644 \u0637\u0644\u0628 \u0639\u0631\u0636 \u0633\u0639\u0631<\/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

\u0623\u0631\u0633\u0644 \u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631<\/a><\/div>\n

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\u062a\u0648\u0635\u064a\u0644<\/strong>\u0627\u0644\u0623\u062c\u0632\u0627\u0621 \u0627\u0644\u0642\u064a\u0627\u0633\u064a\u0629: \u0645\u0646 10 \u0625\u0644\u0649 25 \u064a\u0648\u0645 \u0639\u0645\u0644. \u0627\u0644\u0645\u0643\u0648\u0646\u0627\u062a \u0627\u0644\u0645\u0635\u0645\u0645\u0629 \u062d\u0633\u0628 \u0627\u0644\u0637\u0644\u0628: \u0645\u0646 20 \u0625\u0644\u0649 45 \u064a\u0648\u0645 \u0639\u0645\u0644. \u0645\u0639\u062f\u0627\u062a \u0627\u0644\u0645\u0634\u0627\u0631\u064a\u0639: \u0645\u0646 45 \u0625\u0644\u0649 120 \u064a\u0648\u0645 \u0639\u0645\u0644.<\/span><\/div>
\u0634\u0631\u0648\u0637 \u0627\u0644\u062a\u062c\u0627\u0631\u0629<\/strong>\u062a\u064f\u062f\u0639\u0645 \u0634\u0631\u0648\u0637 EXW \u0648FOB \u0648CIF \u0648DAP \u0628\u0634\u0643\u0644 \u0634\u0627\u0626\u0639. \u0623\u0645\u0627 \u0634\u0631\u0648\u0637 FCA \u0648CFR \u0648CPT \u0648CIP \u0648DDP \u0641\u064a\u0645\u0643\u0646 \u0645\u0646\u0627\u0642\u0634\u062a\u0647\u0627 \u062d\u0633\u0628 \u0643\u0644 \u062d\u0627\u0644\u0629 \u0639\u0644\u0649 \u062d\u062f\u0629.<\/span><\/div><\/div><\/div>\n<\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"

Sun gear damage is evidence about the whole planetary stage. Replacing the center gear without finding the cause can lead to repeat failure.<\/p>","protected":false},"author":1,"featured_media":1099,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1081","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sun-gears"],"_links":{"self":[{"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/posts\/1081","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/comments?post=1081"}],"version-history":[{"count":1,"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/posts\/1081\/revisions"}],"predecessor-version":[{"id":1127,"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/posts\/1081\/revisions\/1127"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/media\/1099"}],"wp:attachment":[{"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/media?parent=1081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/categories?post=1081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sun-gears.net\/ar\/wp-json\/wp\/v2\/tags?post=1081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}