{"id":793,"date":"2026-09-23T02:04:14","date_gmt":"2026-09-23T02:04:14","guid":{"rendered":"https:\/\/sungears.top\/product\/splined-bore-sun-gear\/"},"modified":"2026-09-23T02:11:39","modified_gmt":"2026-09-23T02:11:39","slug":"splined-bore-sun-gear","status":"publish","type":"product","link":"https:\/\/sungears.top\/fa\/product\/splined-bore-sun-gear\/","title":{"rendered":"Splined Bore Sun Gear"},"content":{"rendered":"
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Planetary Gear Components<\/span><\/p>\n

Splined Bore Sun Gear<\/h1>\n

Sun gears with internal splines or other torque-transmitting bore interfaces for motor, shaft or carrier-side integration.<\/p>\n

Request a Quote<\/a>Send a drawing or sample details<\/a><\/div>\n<\/div>\n
\"Splined<\/div>\n<\/section>\n
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Function in the assembly<\/span><\/p>\n

Specify the sun gear as part of a planetary mesh<\/h2>\n<\/div>\n
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The spline is part of the torque path and must be treated as an engineered interface, not as a secondary bore feature. Specify spline system, tooth count, module\/DP or pitch, pressure angle, fit\/tolerance class, effective length and the axial locating method. Concentricity between spline and gear teeth is especially important when the spline is the rotating datum.<\/p>\n

For quotation, the most reliable input is the released drawing plus mating-gear data. If the design is still open, provide the required ratio, torque, speed, duty cycle, package envelope and interface constraints so the unresolved items can be identified before manufacturing.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Technical specification<\/span><\/p>\n

Information used to define the ordered part<\/h2>\n<\/div>\n
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Sun gears are not interchangeable simply because two parts have a similar diameter. The tooth system and the rotating interface must match the planetary stage.<\/p>\n<\/div>\n<\/div>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
Component<\/th>\nSpur or helical sun gear with internal spline<\/td>\n<\/tr>\n
Primary interface<\/th>\nInvolute spline, straight-sided spline or drawing-specific internal form<\/td>\n<\/tr>\n
Tooth system<\/th>\nMetric module or diametral pitch (DP) as defined by drawing<\/td>\n<\/tr>\n
Pressure angle<\/th>\nDrawing-controlled; do not assume from outside diameter alone<\/td>\n<\/tr>\n
Tooth count<\/th>\nRequired for quotation and mesh verification<\/td>\n<\/tr>\n
Gear quality<\/th>\nISO, DIN, AGMA, JIS or customer-specific requirement can be reviewed as stated on the drawing<\/td>\n<\/tr>\n
Materials<\/th>\nAlloy and carbon gear steels selected to drawing; examples used in industrial gear work include 20CrMo, 16MnCr5, 18CrNiMo7-6, 8620-type and 42CrMo families<\/td>\n<\/tr>\n
Heat treatment<\/th>\nCarburizing, nitriding, induction hardening, through-hardening or Q&T where appropriate to the design<\/td>\n<\/tr>\n
Inspection<\/th>\nTooth geometry, runout, bore\/spline\/journals and drawing datums as applicable<\/td>\n<\/tr>\n
Supply basis<\/th>\nNew design, drawing-to-print, sample-supported replacement or matched planetary set<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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\"Planetary<\/div>\n
Mating components<\/span><\/p>\n

Check sun, planet and ring data together<\/h2>\n

A conventional planetary stage combines a central sun gear, one or more planet gears, an internal ring gear and a carrier. The tooth counts and mesh geometry constrain each other. For a replacement, measuring only the damaged sun gear can miss profile shift, backlash strategy or mating-gear wear.<\/p>\n

When available, send the planet gear and ring gear drawings, gearbox assembly drawing, original tooth counts, center-distance information and any contact-pattern or backlash requirement. This is especially important for helical planetary stages.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Manufacturing route<\/span><\/p>\n

Process planning follows geometry, material and required quality<\/h2>\n<\/div>\n
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Depending on geometry and volume, internal splines may be shaped, broached, skived or otherwise machined. The heat-treatment route must account for both tooth and spline requirements, followed by inspection with the gauges or measured characteristics called out on the drawing.<\/p>\n

The manufacturing route can therefore differ even between two sun gears of the same module. Batch quantity also matters because it affects tooling, fixturing and which spline or internal-feature process is economical.<\/p>\n<\/div>\n<\/div>\n

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Gear cutting<\/h3>\n

Hobbing, shaping or another generating process is selected to fit the tooth geometry and access.<\/p>\n<\/article>\n

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Heat treatment<\/h3>\n

Material and case\/core requirements are kept tied to the released drawing and duty.<\/p>\n<\/article>\n

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Hard finishing<\/h3>\n

Grinding or other finishing is added only when the required accuracy and surface condition justify it.<\/p>\n<\/article>\n

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Inspection<\/h3>\n

Tooth measurements are related to the functional bore, spline, journal and face datums.<\/p>\n<\/article>\n<\/div>\n<\/section>\n

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RFQ checklist<\/span><\/p>\n

What to send for an accurate quotation<\/h2>\n<\/div>\n
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Send the drawing or a clear set of gear data, then add the operating information that is not visible on the drawing. A sample can support a replacement project, but it should not be used to guess an unknown heat treatment or quality grade.<\/p>\n<\/div>\n<\/div>\n

\n\n\n\n\n\n\n\n\n\n
Geometry<\/th>\nModule\/DP, tooth count, pressure angle, spur\/helical form, helix angle and hand where applicable<\/td>\n<\/tr>\n
Interface<\/th>\nBore, keyway, spline, shaft, journal, thread and locating faces<\/td>\n<\/tr>\n
Material \/ heat treatment<\/th>\nMaterial grade, hardness or case requirement, surface treatment if specified<\/td>\n<\/tr>\n
Quality \/ inspection<\/th>\nGear-quality standard and grade, runout, profile\/lead or special inspection requirements<\/td>\n<\/tr>\n
Duty<\/th>\nTorque, speed, duty cycle, reversals, lubrication and working temperature when relevant<\/td>\n<\/tr>\n
Mating data<\/th>\nPlanet\/ring tooth counts or drawings, carrier\/center-distance information<\/td>\n<\/tr>\n
Commercial<\/th>\nQuantity, target delivery, packaging and Incoterm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Send RFQ<\/a>Send a drawing or sample details<\/a><\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Sun gears with internal splines or other torque-transmitting bore interfaces for motor, shaft or carrier-side integration. Quote from tooth geometry, interface, material\/heat treatment, accuracy requirement, mating data and quantity.<\/p>\n","protected":false},"featured_media":757,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[1934],"product_tag":[],"class_list":["post-793","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-sun-gear-shafts-splines"],"_links":{"self":[{"href":"https:\/\/sungears.top\/fa\/wp-json\/wp\/v3\/product\/793","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sungears.top\/fa\/wp-json\/wp\/v3\/product"}],"about":[{"href":"https:\/\/sungears.top\/fa\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/sungears.top\/fa\/wp-json\/wp\/v2\/comments?post=793"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sungears.top\/fa\/wp-json\/wp\/v2\/media\/757"}],"wp:attachment":[{"href":"https:\/\/sungears.top\/fa\/wp-json\/wp\/v2\/media?parent=793"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/sungears.top\/fa\/wp-json\/wp\/v2\/product_cat?post=793"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/sungears.top\/fa\/wp-json\/wp\/v2\/product_tag?post=793"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}