{"id":799,"date":"2026-09-23T02:05:03","date_gmt":"2026-09-23T02:05:03","guid":{"rendered":"https:\/\/sungears.top\/product\/internal-ring-gear\/"},"modified":"2026-09-23T02:11:55","modified_gmt":"2026-09-23T02:11:55","slug":"internal-ring-gear","status":"publish","type":"product","link":"https:\/\/sungears.top\/ar\/product\/internal-ring-gear\/","title":{"rendered":"Internal Ring Gear"},"content":{"rendered":"
\n
Planetary Gear Components<\/span><\/p>\n

Internal Ring Gear<\/h1>\n

Internal ring gears for planetary transmissions, matched to the planet gears and required stage geometry.<\/p>\n

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

Specify the sun gear as part of a planetary mesh<\/h2>\n<\/div>\n
\n

The ring gear defines the outer mesh of the planetary stage. Its tooth count and pitch system are linked to sun and planet geometry, while the body design controls how the gear is located in the housing. Internal-tooth inspection and heat-treatment distortion need specific planning because the measurement and finishing routes differ from external gears.<\/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

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

Information used to define the ordered part<\/h2>\n<\/div>\n
\n

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>\nInternal spur or helical gear<\/td>\n<\/tr>\n
Primary interface<\/th>\nHousing fit, flange, bolt pattern or integral rim by drawing<\/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
\n
\n
\"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

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

Process planning follows geometry, material and required quality<\/h2>\n<\/div>\n
\n

Gear shaping, skiving or other internal-tooth processes may be selected according to size, material and accuracy. Heat-treatment and final finishing are chosen from the drawing rather than assumed from the sun gear.<\/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

\n
<\/svg><\/span><\/p>\n

Gear cutting<\/h3>\n

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

<\/svg><\/span><\/p>\n

Heat treatment<\/h3>\n

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

<\/svg><\/span><\/p>\n

Hard finishing<\/h3>\n

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

<\/svg><\/span><\/p>\n

Inspection<\/h3>\n

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

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

What to send for an accurate quotation<\/h2>\n<\/div>\n
\n

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":"

Internal ring gears for planetary transmissions, matched to the planet gears and required stage geometry. Quote from tooth geometry, interface, material\/heat treatment, accuracy requirement, mating data and quantity.<\/p>\n","protected":false},"featured_media":759,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[1935],"product_tag":[],"class_list":["post-799","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-planetary-gear-components"],"_links":{"self":[{"href":"https:\/\/sungears.top\/ar\/wp-json\/wp\/v3\/product\/799","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sungears.top\/ar\/wp-json\/wp\/v3\/product"}],"about":[{"href":"https:\/\/sungears.top\/ar\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/sungears.top\/ar\/wp-json\/wp\/v2\/comments?post=799"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sungears.top\/ar\/wp-json\/wp\/v2\/media\/759"}],"wp:attachment":[{"href":"https:\/\/sungears.top\/ar\/wp-json\/wp\/v2\/media?parent=799"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/sungears.top\/ar\/wp-json\/wp\/v2\/product_cat?post=799"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/sungears.top\/ar\/wp-json\/wp\/v2\/product_tag?post=799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}