{"id":1651,"date":"2026-07-16T08:58:56","date_gmt":"2026-07-16T08:58:56","guid":{"rendered":"https:\/\/gearrack.top\/product\/planetary-ring-gear-m3-m12-multi-material-din6-9\/"},"modified":"2026-07-16T08:58:57","modified_gmt":"2026-07-16T08:58:57","slug":"planetary-ring-gear-m3-m12-multi-material-din6-9","status":"publish","type":"product","link":"https:\/\/gearrack.top\/ja\/product\/planetary-ring-gear-m3-m12-multi-material-din6-9\/","title":{"rendered":"Planetary Ring Gear – M3-M12, Multi-Material, DIN6-9"},"content":{"rendered":"
\n

<\/p>\n

Product Overview<\/h2>\n
\n
\n \"Planetary\n <\/div>\n
\n

The planetary ring gear<\/strong> is the outermost fixed element of the planetary gear transmission \u2014 a large-diameter internal ring gear whose teeth mesh simultaneously with all planet gears in the assembly. In the standard planetary gearbox configuration, the sun gear rotates at input speed at the centre, the planet gears revolve around the sun while rotating on their own axes, and the ring gear is held stationary in the housing. The planet carrier \u2014 bolted to the planet gear shafts \u2014 delivers the output torque. This arrangement allows the planetary gear set to achieve a high torque multiplication ratio within a very compact, coaxial (inline) form factor.<\/p>\n

Korea Ever-Power’s planetary ring gears<\/a> are manufactured in modules M3 through M12 (custom modules available), in a broad material range from POM plastic through C45 steel and stainless steel, to precision grades DIN 6\u20139. All specifications per customer drawing or requirement. Factory with unique manufacturing process, large stock of tools, raw materials, and semi-finished products \u2014 enabling fastest-possible order completion. Custom gears accepted; reverse engineering from damaged gear available.<\/p>\n<\/p><\/div>\n<\/div>\n

The inner ring gear in a planetary gear transmission is characterised by small size relative to its torque capacity, lightweight, wide speed ratio range, high transmission efficiency, and low noise. Its teeth are on the internal bore \u2014 meshing with the planet gears from the outside in. Compared with an equivalent external gear pair of the same ratio and torque capacity, the planetary ring gear arrangement occupies approximately one-half to one-sixth the volume and weight, making it the dominant transmission architecture for applications where compactness and high power density are primary design requirements.<\/p>\n

<\/p>\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Planetary Ring Gear \u2014 Product Specification<\/th>\n<\/tr>\n<\/thead>\n
Module<\/strong><\/td>\nM3, M4, M5, M8, M12 \u2014 and custom modules per drawing<\/td>\n<\/tr>\n
Material<\/strong><\/td>\nBrass, C45 steel, stainless steel, copper, POM, aluminium, alloy steel \u2014 as customer required<\/td>\n<\/tr>\n
Surface Treatment<\/strong><\/td>\nZinc-plated, nickel-plated, passivation, oxidation, anodisation, Geomet, Dacromet, black oxide, phosphatising, powder coating, electrophoresis<\/td>\n<\/tr>\n
Standard<\/strong><\/td>\nISO, DIN, ANSI, JIS, BS \u2014 and non-standard<\/td>\n<\/tr>\n
Precision Grade<\/strong><\/td>\nDIN 6, DIN 7, DIN 8, DIN 9<\/td>\n<\/tr>\n
Teeth Treatment<\/strong><\/td>\nHardened, milled, or ground<\/td>\n<\/tr>\n
Tolerance<\/strong><\/td>\n0.001 mm \u2013 0.01 mm \u2013 0.1 mm<\/td>\n<\/tr>\n
\u4ed5\u4e0a\u3052\u308b<\/strong><\/td>\nShot\/sandblast, heat treatment, annealing, tempering, polishing, anodising, zinc-plated<\/td>\n<\/tr>\n
\u30d1\u30c3\u30b1\u30fc\u30b8<\/strong><\/td>\nPlastic bag + cartons, or wooden packing<\/td>\n<\/tr>\n
Payment Terms<\/strong><\/td>\nT\/T, L\/C<\/td>\n<\/tr>\n
Sample Lead Time<\/strong><\/td>\n20 business days<\/td>\n<\/tr>\n
Bulk Lead Time<\/strong><\/td>\n25 business days<\/td>\n<\/tr>\n
Application<\/strong><\/td>\nAutomatic control machines, semiconductor industry, general industrial machinery, medical equipment, solar energy equipment, machine tools, parking systems, high-speed rail and aviation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Planetary Gear System \u2014 How the Ring Gear Works<\/h2>\n

\"types-of-planetary-gear-1\"<\/p>\n

A planetary gear set has three principal elements: the sun gear<\/strong> (centre input), the planet gears<\/strong> (intermediate idlers on the carrier), and the ring gear<\/strong> (outer internal gear). The transmission ratio and direction of rotation at the output depend on which element is fixed, which is the input, and which is the output:<\/p>\n

\n\n\n\n\n\n\n\n\n
Fixed Element<\/th>\nInput<\/th>\nOutput<\/th>\nEffect<\/th>\n<\/tr>\n<\/thead>\n
Ring gear \u2605<\/td>\nSun gear<\/td>\nPlanet carrier<\/td>\nSpeed reduction \u2014 most common configuration \u2713<\/td>\n<\/tr>\n
Planet carrier<\/td>\nSun gear<\/td>\nRing gear<\/td>\nSpeed increase (overdrive)<\/td>\n<\/tr>\n
Sun gear<\/td>\nRing gear<\/td>\nPlanet carrier<\/td>\nSpeed reduction (reverse input)<\/td>\n<\/tr>\n
None (all free)<\/td>\nSun + ring<\/td>\nPlanet carrier<\/td>\nDifferential (motion summation)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

In the most common reduction configuration (ring gear fixed, sun input, carrier output), the transmission ratio is:<\/p>\n

\ni = 1 + Zring<\/sub> \/ Zsun<\/sub><\/strong>
\nwhere Zring<\/sub> = number of ring gear teeth, Zsun<\/sub> = number of sun gear teeth.<\/p>\n

Example: Zring<\/sub> = 60, Zsun<\/sub> = 20 \u2192 i = 1 + 60\/20 = 4:1 reduction<\/strong>.
\nThe planet gear tooth count must satisfy: Zring<\/sub> = Zsun<\/sub> + 2 \u00d7 Zplanet<\/sub>.\n<\/div>\n

For a standard involute planetary stage with 3\u20135 planet gears, the practical ratio range per stage is approximately 3:1 to 10:1. Multi-stage planetary gearboxes (two or three stages in series) achieve ratios from 9:1 to 1,000:1 or higher while maintaining the compact, coaxial form factor.<\/p>\n

<\/p>\n

Four Core Advantages of Planetary Gear Transmission<\/h2>\n

\"Ever-Power<\/p>\n

\n
\n

\u2460 Compact Structure, Small Size, Lightweight<\/h3>\n

Planetary transmission uses the principle of planetary motion and power splitting \u2014 only internal gear pairs are used, making full use of the large bearing capacity of the internal tooth form and the entire space of the ring gear bore. At the same power and transmission ratio, the volume and weight of a planetary gear reducer are approximately one-half to one-sixth that of a standard parallel-shaft gear transmission.<\/p>\n<\/p><\/div>\n

\n

\u2461 Large Transmission Ratio Range<\/h3>\n

Many types of planetary transmission exist \u2014 involute planetary, cycloidal pinion (RV), harmonic drive, and movable-tooth planetary \u2014 all characterised by wide ratio range. For motion transmission, ratios of tens of thousands are achievable. Differential planetary arrangements also realise the combination of two input motions or the decomposition of one motion into two outputs \u2014 enabling complex motion synthesis not possible with simple gear trains.<\/p>\n<\/p><\/div>\n

\n

\u2462 High Efficiency, Low Power Loss<\/h3>\n

Multiple planet gears distribute load equally between the sun gear and ring gear \u2014 balancing inertia forces on the carrier bearings and reducing friction losses compared with an equivalent external gear train. A well-designed planetary gear reducer achieves efficiency of 0.97\u20130.99 per stage \u2014 among the highest of any gear transmission type.<\/p>\n<\/p><\/div>\n

\n

\u2463 Balanced Transmission, Strong Vibration Resistance<\/h3>\n

Multiple planet gears distributed equally around the sun and ring gears produce balanced force distribution \u2014 load is shared among all planet gears simultaneously, and centrifugal and inertia forces cancel across the symmetric assembly. This significantly improves operating stability and the transmission’s resistance to impact and vibration loads in automotive and industrial applications.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Ring Gear Manufacturing \u2014 Quality and Process<\/h2>\n

\"measuring<\/p>\n

The planetary ring gear’s internal teeth are among the most demanding gear manufacturing challenges \u2014 the cutting tool must operate inside the bore with restricted access and limited chip clearance. Korea Ever-Power uses the following primary processes for planetary ring gear production:<\/p>\n

\n
\n

Gear Shaping<\/h3>\n

The standard process for cutting internal ring gear teeth. A reciprocating disc-shaped cutter plunges into the bore and generates the involute tooth profile by a generating motion. Achieves DIN 7\u20139 accuracy in a single pass. The critical quality factor is minimising tooth surface roughness \u2014 achieved by high shaper rigidity, optimal cutting parameters, and post-shaping shaving or honing where required.<\/p>\n<\/p><\/div>\n

\n

Internal Tooth Grinding<\/h3>\n

Post-heat-treatment tooth grinding corrects distortion and achieves DIN 4\u20136 accuracy with Ra 0.6 tooth surface finish. Essential for planetary ring gears in automotive transmissions, robot joints, and precision servo drives where transmission error and surface fatigue life are primary requirements. Korea Ever-Power’s internal grinding capability covers ring gears from ID 100 mm to OD 2,500 mm.<\/p>\n<\/p><\/div>\n

\n

Broaching<\/h3>\n

Broaching cuts all teeth in one linear stroke \u2014 extremely fast and accurate for internal ring gears in high production volumes. Achieves DIN 6\u20137 accuracy directly without secondary finishing in most cases. Best suited to smaller-diameter ring gears where the broach tooling envelope is practical.<\/p>\n<\/p><\/div>\n

\n

Tooth Thickness Inspection<\/h3>\n

Three standard methods: tooth thickness vernier caliper (simple, all sizes), span measurement with precision micrometer (most accurate, independent of OD reference, ideal for production inspection), and ball\/roller measurement (for effective bore diameter through meshing contact). Korea Ever-Power uses a dedicated roughness measuring instrument and Gear Testing Centre for profile accuracy verification.<\/p>\n<\/p><\/div>\n

\n

Error Control<\/h3>\n

Planetary ring gear errors arise from five sources: theoretical errors, machine geometric errors, tool errors, fixture errors, and deformation errors (cutting forces, heat, internal stress). Korea Ever-Power controls each through regular tooling calibration, CNC geometric compensation, controlled heat treatment cycles, and in-process dimensional inspection at every operation step.<\/p>\n<\/p><\/div>\n

\n

Post-Shaping Improvements<\/h3>\n

To reduce tooth surface roughness below Ra 1.6 after gear shaping, Korea Ever-Power applies shaving (pre-hardening smoothing) and honing (post-hardening smoothing without significant material removal). Improving material machinability and using high-rigidity tooling to reduce vibration during shaping also contribute to the tooth surface quality required for precision planetary ring gears.<\/p>\n<\/p><\/div>\n<\/div>\n

\"Ever-Power<\/p>\n

<\/p>\n

Applications<\/h2>\n
\n
\n
<\/div>\n

Automatic Control Machines<\/h3>\n

Planetary ring gears M3\u2013M5 in servo actuator planetary stages for CNC machine tool axes, robotic arm joints, and automated assembly equipment. The compact coaxial form allows the servo motor to mount inline with the driven axis \u2014 eliminating the offset required by parallel-shaft gear trains.<\/p>\n<\/p><\/div>\n

\n
<\/div>\n

Medical Equipment<\/h3>\n

Stainless steel or aluminium planetary ring gears M3\u2013M5 DIN 6\u20137 in surgical robot joint drives, imaging table positioning actuators, and rehabilitation device motors. Medical ring gears require non-magnetic materials, autoclave-compatible surface treatments, and full traceability documentation for regulatory compliance.<\/p>\n<\/p><\/div>\n

\n
<\/div>\n

Semiconductor Industry<\/h3>\n

Planetary ring gears in wafer handling robot planetary joints, mask aligner positioning drives, and semiconductor etching vacuum actuators. Semiconductor applications require ultra-clean materials, tight positional accuracy, and minimal particle generation \u2014 driving the specification of high-accuracy ground planetary ring gears in aluminium or stainless steel.<\/p>\n<\/p><\/div>\n

\n
<\/div>\n

General Industrial Machinery<\/h3>\n

C45 or alloy steel planetary ring gears M5\u2013M12 in industrial planetary gearbox reducers for conveyor systems, agitator drives, mixer drives, and fan drives. The planetary transmission’s high torque density and efficiency make it the preferred architecture where space is limited and operating cost is a long-term consideration.<\/p>\n<\/p><\/div>\n

\n
\u2600\ufe0f<\/div>\n

Solar Energy Equipment<\/h3>\n

Alloy steel planetary ring gears in solar tracker azimuth and elevation planetary drives, heliostat pointing drives, and CSP plant mirror positioning actuators. Solar tracker planetary drives must operate for 25+ years with minimal maintenance in outdoor environments \u2014 requiring high-durability ring gears with corrosion-resistant surface treatments.<\/p>\n<\/p><\/div>\n

\n
<\/div>\n

High-Speed Rail and Aviation<\/h3>\n

Premium alloy steel planetary ring gears in aircraft actuator planetary stages, APU drives, and high-speed rail traction motor planetary reducers. Aviation and rail ring gears require full material traceability, independent inspection reports, and typically DIN 5\u20136 accuracy grades above standard industrial applications.<\/p>\n<\/p><\/div>\n

\n
\ufe0f<\/div>\n

Parking Systems<\/h3>\n

C45 or alloy steel planetary ring gears in automated parking system lift and transfer planetary drives. Automated parking structures use compact planetary drives to lift and move vehicles within small footprints \u2014 the planetary transmission’s coaxial compactness and high torque density are exactly the properties these confined-space drives require.<\/p>\n<\/p><\/div>\n

\n
<\/div>\n

Machine Tools<\/h3>\n

Precision planetary ring gears DIN 6\u20137 in CNC machining centre spindle planetary ranges, lathe headstock gear ranges, and grinding machine table drives. Machine tool planetary ring gears require the lowest achievable transmission error and smooth tooth surfaces to avoid vibration marks on the machined workpiece surface.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Frequently Asked Questions<\/h2>\n
\n
\n

Are you a factory or a trading company?<\/p>\n

Korea Ever-Power is a factory. Our unique manufacturing process, coupled with a large stock of tools, raw materials, and semi-finished products, allows us to complete planetary ring gear orders in the shortest possible time. All planetary ring gears are manufactured in our own facility \u2014 giving direct control over quality, lead time, and cost.<\/p>\n<\/div>\n

\n
\n

Can you manufacture non-standard planetary ring gears?<\/p>\n

Yes \u2014 Korea Ever-Power manufactures non-standard planetary ring gears with any module, tooth count, bore diameter, face width, material, or pressure angle per the customer’s drawing or specification. We have tooling to manufacture any metric size. Our R&D team can assist with design review, interference condition checking, and material recommendation before the production drawing is confirmed.<\/p>\n<\/div>\n

\n
\n

What if I cannot identify the planetary ring gear I need?<\/p>\n

Send us the damaged ring gear \u2014 Korea Ever-Power specialises in reverse engineering. We measure the gear (outer diameter, bore, face width, tooth count, module, pressure angle, helix angle, and surface treatment) and produce a reproduction drawing for your approval before manufacturing. This covers legacy gearbox repairs where original OEM documentation no longer exists.<\/p>\n<\/div>\n

\n
\n

What is the minimum order quantity?<\/p>\n

Minimum requirements depend on the specific planetary ring gear ordered. Send drawings, pictures, sample gears, or specifications, and we will confirm the minimum quantity for that configuration. For samples, the sample fee and freight are required in advance; if a subsequent large order is placed, the sample cost is returned.<\/p>\n<\/div>\n

\n
\n

How do I get the lowest price on planetary ring gears?<\/p>\n

Increasing quantity reduces the fixed cost per piece \u2014 the more pieces ordered, the lower the unit price. Material choice also significantly affects price: POM and aluminium ring gears are less expensive than alloy steel at the same module and size. Send the required specification and target quantity, and Korea Ever-Power will provide a tiered price schedule for different quantity breaks. Contact our team<\/a> for a quotation.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Customer Reviews<\/h2>\n
\n
\n

“We develop servo actuator planetary gearboxes for CNC machining centre axes and source planetary ring gears M5 DIN 7 in C45 steel from Korea Ever-Power. Sample in 20 business days; bulk in 25 \u2014 delivered within the committed lead time across six reorder cycles. Profile confirmed DIN 7 on our gear measurement machine. The factory’s reverse engineering service resolved a legacy ring gear specification we had no drawing for \u2014 they reproduced it accurately from the damaged original.”<\/p>\n

Kim Dong-jun<\/strong>  |  CNC Actuator Design Engineer, Incheon Precision Drive Systems Co.  ·  Q1 2026<\/em><\/p>\n<\/div>\n

\n

“We manufacture surgical robot joint planetary drives and specified stainless steel planetary ring gears<\/a> M3 DIN 6 from Korea Ever-Power. Non-magnetic confirmation and autoclave compatibility met our medical device material requirements. Korea Ever-Power’s R&D team provided design support on the tooth count combination to avoid trochoid interference at our specific sun\/planet ratio. Quality documentation included for our regulatory submission.”<\/p>\n

Lee Hyeon-jun<\/strong>  |  Surgical Robot Mechanism Engineer, Gyeonggi Medical Robotics Co.  ·  Q4 2025<\/em><\/p>\n<\/div>\n

\n

“We supply planetary ring gears for solar tracker azimuth drives \u2014 alloy steel M8, zinc-plated, DIN 8. Korea Ever-Power’s large raw material and semi-finished stock meant our urgent order was processed faster than the standard 25-day bulk lead time. The planetary transmission efficiency of 0.98 confirmed at our test rig matches the factory’s specification.”<\/p>\n

Park Sang-hyeon<\/strong>  |  Solar Tracker Drive Engineer, Busan Solar Energy Systems Co.  ·  Q2 2026<\/em><\/p>\n<\/div>\n

\n

“We distribute planetary ring gears to industrial machinery manufacturers. Korea Ever-Power’s tiered pricing by quantity gave us a clear commercial framework for stocking standard M5 and M8 ring gears. POM planetary ring gears for light-duty drives alongside alloy steel for heavy-duty \u2014 both supplied from the same factory, same quality process. No non-conformances in 14 months of distribution.”<\/p>\n

Choi Hyeon-woo<\/strong>  |  Industrial Parts Distribution Manager, Daejeon Precision Components Co.  ·  Q3 2025<\/em><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Related Products<\/h2>\n
\n
\n
\n \"Planetary
\n <\/a><\/p>\n
\n

Planetary Gears<\/h3>\n

Complete planetary gear sets, kits, and components.<\/p>\n

Browse \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

\n
\n \"\u30ea\u30f3\u30b0\u30ae\u30a2\"
\n <\/a><\/p>\n
\n

Ring Gears<\/h3>\n

Full ring gear range \u2014 aerospace, wind turbine, automotive, industrial and more.<\/p>\n

Browse \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

\n
\n \"\u5e73\u6b6f\u8eca\"
\n <\/a><\/p>\n
\n

Spur Gears<\/h3>\n

Sun and planet gear spur gears for all planetary assemblies.<\/p>\n

Browse \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

\n
\n \"Helical
\n <\/a><\/p>\n
\n

Helical Gears<\/h3>\n

Helical sun and planet gears for lower-noise planetary stages.<\/p>\n

Browse \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

\n
\n \"\u30d9\u30d9\u30eb\u30ae\u30a2\"
\n <\/a><\/p>\n
\n

\u30d9\u30d9\u30eb\u30ae\u30a2<\/h3>\n

Bevel and spiral bevel gears for right-angle output direction changes.<\/p>\n

Browse \u2192<\/a>\n <\/div>\n<\/p><\/div>\n<\/div>\n

\n

Request a Quotation for Planetary Ring Gears<\/h3>\n

M3\u2013M12 standard; all modules, materials, and accuracy grades per drawing. Sample 20 business days; bulk 25 days. T\/T \/ L\/C. Custom, non-standard, and reverse-engineered ring gears accepted.<\/p>\n

Get a Quote Now<\/a>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power planetary ring gears are precision internal ring gears for planetary gear transmission \u2014 the fixed outer element that engages planet gears while the sun gear drives from the centre. Models: M3, M4, M5, M8, M12, and custom modules. Materials: brass, C45 steel, stainless steel, copper, POM, aluminium, alloy steel. Precision: DIN 6\u20139. Teeth: hardened, milled, or ground. Tolerance: 0.001\u20130.1 mm. Sample 20 business days; bulk 25 days. T\/T, L\/C. Applications: automatic control machines, semiconductor industry, general industrial machinery, medical equipment, solar energy equipment, machine tools, parking systems, high-speed rail and aviation.<\/p>","protected":false},"featured_media":1652,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[4561],"product_tag":[],"class_list":["post-1651","product","type-product","status-publish","has-post-thumbnail","product_cat-planetary-gear","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product\/1651","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/comments?post=1651"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/media\/1652"}],"wp:attachment":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/media?parent=1651"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product_brand?post=1651"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product_cat?post=1651"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/product_tag?post=1651"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}