Custom Planetary Gear Manufacturer

Frequently Asked Questions About Custom Planetary Gear Parts

1. What custom planetary gear components can SIMIS manufacture?

SIMIS manufactures custom planetary gear components for industrial and vehicle transmission equipment according to OEM drawings. Our product range includes sun gears, planet gears, internal ring gears, planetary gear carriers, gear blanks and related metal transmission parts. Suitable manufacturing processes include closed-die steel forging, open-die forging, seamless ring rolling, steel casting and ductile iron casting. Products can be supplied as forged blanks, castings or finished gear components according to the customer's specifications.

2. Can SIMIS manufacture forged steel sun gears and planet gears?

Yes. Closed-die forging is an important SIMIS manufacturing process for suitable carbon steel and alloy steel sun gear blanks, planet gear blanks and compact transmission components. Depending on the application, material options may include AISI 8620, 9310, 4140 and other customer-specified forging steels. Forging produces the principal metal blank, while the required tooth geometry and finished interfaces are manufactured according to the approved drawings. The material condition and any specified finishing operations are confirmed for each order.

3. Can SIMIS produce planetary ring gears and planet carriers by casting?

Yes. SIMIS supplies suitable cast steel and ductile iron components for selected planetary ring gear blanks, planet carriers and other gearbox structures. Sand casting is relevant to larger or more complex parts, while shell mold casting and investment casting may be considered for compatible components. For suitable forged steel internal ring gears, seamless ring rolling is another important blank-forming option. Casting or forging does not automatically establish the finished gear tooth accuracy or gearbox performance.

4. What materials are available for OEM planetary gears?

SIMIS manufactures suitable planetary gear parts from carbon steel, alloy steel, cast steel, ductile iron and specified stainless steel grades. Examples include AISI 1045 and 1050 carbon steel, AISI 8620 and 9310 carburizing steels, AISI 4140 and 4340 alloy steels, and ASTM A536 ductile iron. Different materials are used for different components and service requirements. A forged alloy steel gear should not be treated as interchangeable with a cast iron carrier or ring gear without customer approval.

5. What information is needed for a custom planetary gear quotation?

Please provide 2D drawings or available 3D CAD models, the required component type, material grade, main dimensions and estimated order quantity. For finished sun gears, planet gears and ring gears, identify the relevant module or diametral pitch, tooth count and tooth arrangement. For planet carriers, include the planet pin interfaces and mounting connections. SIMIS can quote forged blanks, castings or finished components according to the approved manufacturing scope. Send your inquiry to info@simis-group.com.

OEM Custom Planetary Gear Manufacturer and Metal Parts Supplier

Custom planetary gear components are metal parts used in planetary transmission systems, also called epicyclic gear trains. A typical planetary arrangement includes a central sun gear, multiple planet gears, an internally toothed ring gear and a carrier supporting the planet gear axes. The relative movement and connection of these elements determine the transmission's operating characteristics.

SIMIS specializes in OEM forged alloy steel sun gears, custom planet gears, internal ring gears, cast steel planetary carriers, ductile iron gearbox components and related transmission forgings. We manufacture customer-defined metal parts using suitable forging, casting and finishing processes.

Planetary gear arrangements are used in compact gearboxes and various industrial transmissions. Different systems can provide speed reduction, speed increase or other transmission relationships depending on which element is driven, held stationary or connected to the output. Their components vary substantially in diameter, tooth configuration, mounting arrangement and material.

Sun and planet gears are often manufactured from suitable wrought alloy steel blanks. Larger ring gears may use seamless ring-rolled steel blanks or approved cast metal structures. Planet carriers may be manufactured through forging, casting or other specified metal construction methods depending on the equipment design.

SIMIS supplies individual planetary gear components rather than treating every order as a complete planetary gearbox assembly. Customers can purchase raw forgings, cast blanks or finished metal parts. Our manufacturing processes and material grades are selected according to the approved OEM drawings and purchase requirements.

Related OEM products include custom internal and external ring gears and custom helical gear components for industrial transmission systems.

Types of Custom Sun Gears, Planet Gears, Ring Gears and Planet Carriers

SIMIS manufactures different metal components for planetary gear transmissions. Although these parts operate within the same gear arrangement, their shapes and functions are different. The required material and manufacturing process depend on the individual component.

Forged Steel Sun Gears and Integral Sun Gear Shafts

The sun gear is located at the center of a conventional planetary gear train. It has external teeth and may be manufactured as an individual gear or as an integral geared shaft. Its connection features depend on the transmission arrangement.

SIMIS manufactures suitable alloy steel sun gear blanks by forging and supplies specified finished metal components. Related shaft-based products include custom gear rotary shafts and pinion shafts.

Custom Planet Gears for Planetary Reducers

Planet gears rotate around axes supported by the planet carrier while engaging with the sun and ring gears. A typical planet gear contains external teeth and an internal bore or bearing arrangement. Its geometry is defined by the particular gearbox design.

SIMIS supplies suitable forged steel planet gear blanks and finished gear parts in the customer-specified alloy. The number of planet gears, gear dimensions and mounting arrangement vary between planetary systems.

Custom Internal Ring Gears and Annular Gear Components

An internal ring gear has teeth on its inner circumference. For suitable larger steel ring gears, seamless ring rolling provides an efficient forging route for manufacturing the annular blank. Other approved gear rings may be manufactured from cast steel or ductile iron.

The ring gear blank is subsequently manufactured to the specified internal tooth geometry and mounting interfaces. SIMIS supplies customer-defined components rather than applying one fixed module, tooth count or gear accuracy grade to every product.

Cast Steel and Ductile Iron Planet Carriers

The planet carrier supports the planet gear axes. Depending on the gearbox, it may contain a central body, supporting plates, mounting hubs and locations for planet pins or bearings. Carrier components often have shapes different from conventional toothed gears.

SIMIS supplies suitable cast steel and ductile iron carrier bodies through approved metal casting processes. Forged carriers or forged carrier blanks may also be manufactured where specified by the OEM. The material and construction are selected for the actual equipment requirements.

Steel Forging, Ring Rolling and Casting Processes for Planetary Gear Parts

SIMIS offers different forging and casting processes for custom planetary gear components. Closed-die forging is particularly relevant to suitable sun and planet gear blanks. Open-die forging can produce larger metal blanks, while seamless ring rolling is an important manufacturing method for suitable forged steel ring gear preforms.

Casting provides additional options for certain planet carriers, large ring structures and other complex gearbox components. Sand casting, shell mold casting and investment casting are used for different combinations of metal grades, part geometry and production quantity.

Closed-Die Forging for Sun and Planet Gear Blanks

Closed-die forging is a core SIMIS manufacturing process for suitable steel sun gear and planet gear blanks. A steel billet is heated and formed between shaped dies under pressure. The forging process produces a metal blank with the main external shape required for further gear manufacturing.

Forging is used in many mechanical power transmission applications because suitable wrought steel materials can be formed into solid components with specified mechanical properties. Alloy steel grades are commonly selected for certain gear applications according to the gearbox manufacturer's requirements.

SIMIS supplies custom closed-die forgings for suitable carbon steel and alloy steel components. Forging forms the gear blank; the finished gear teeth and connection interfaces are subsequently produced according to the approved drawing.

Open-Die Forging for Larger Gear and Carrier Blanks

Open-die forging is an option for larger steel blanks and certain substantial transmission components. Heated steel is progressively shaped using forging presses or hammers without being fully enclosed in dedicated impression dies.

For appropriate planetary gearbox products, the process may be used for larger gear blanks, carrier preforms and shaft-related components. SIMIS offers custom open-die forging services for suitable industrial steel parts.

Seamless Ring Rolling for Large Internal Ring Gears

Seamless ring rolling is an important metal forming process for annular steel forgings. A heated ring preform is progressively shaped between rollers to establish the required diameter and ring section.

The process is suitable for selected large internal ring gear blanks made from carbon steel or alloy steel. After ring rolling, the blank is manufactured to the required internal tooth geometry and mounting interfaces. SIMIS provides custom seamless ring rolling and ring forging for suitable OEM applications.

Sand Casting for Planet Carriers and Large Gear Ring Structures

Sand casting is used for many industrial metal components with complex shapes. Molten steel or ductile iron is poured into a prepared sand mold and solidifies to form the required casting.

For planetary gear equipment, suitable sand castings may include large carrier bodies, internal ring gear blanks and supporting structures with integrated mounting features. Casting can provide a practical manufacturing route for customer-defined shapes that differ from relatively simple forged gear blanks.

SIMIS supplies custom sand castings and related steel casting components for approved industrial applications. Material grade and finished supply condition follow the customer's drawings.

Shell Mold and Investment Casting for Complex Carrier Components

Shell mold casting uses resin-bonded sand to form relatively rigid mold shells. It can be considered for certain repeat-production steel or ductile iron carrier bodies and smaller shaped gearbox parts where the geometry and production quantity are suitable.

Investment casting, also known as lost-wax casting, is another option for selected smaller and more complex steel components. It uses a wax pattern and ceramic mold to form suitable detailed metal shapes.

SIMIS provides custom shell mold casting and investment casting services. These processes are considered for compatible carrier and structural parts rather than assumed suitable for every high-load finished gear tooth component.

Alloy Steel, Carbon Steel, Cast Steel and Ductile Iron Planetary Gear Materials

The material used for a planetary gear component depends on its function and approved manufacturing requirements. Forged alloy steels are important for many sun and planet gear applications, while carbon steel, cast steel, ductile iron and selected stainless steels are used for suitable other components.

SIMIS manufactures customer-specified metal grades. Different alloy steel families may require different material conditions and processing requirements. Wrought steel grades should not be substituted directly for cast steel grades, and ductile iron should not be assumed suitable for every highly loaded gear application.

8620, 9310 and 20MnCr5 Carburizing Steels

Carburizing alloy steels are important material options for many power transmission gears. AISI 8620, AISI 9310 and 20MnCr5 are examples of alloy steels that may be selected for suitable case-hardened gear applications.

These materials have different chemical compositions and product specifications. SIMIS manufactures suitable forged gear blanks and finished components according to the customer-specified grade. Any required case hardening or other material condition is defined separately in the purchasing documents.

4140, 4340 and Medium-Carbon Steel Forgings

Chromium-molybdenum and nickel-chromium-molybdenum steels are widely used in appropriate mechanical forgings. AISI 4140, AISI 4340 and related steel grades may be specified for suitable transmission components, shafts and supporting gear structures.

Medium-carbon steels such as AISI 1045 and 1050 are additional options for approved mechanical gear applications. SIMIS provides custom carbon steel and alloy steel forgings according to OEM specifications. No one alloy grade is assigned to all planetary gear components.

Cast Steel and Ductile Iron for Gear Carriers and Ring Structures

Cast steel and ductile iron can be used for selected carrier bodies, larger ring structures and other shaped gearbox components. Their suitability depends on the actual operating requirements and material specification.

Ductile iron contains graphite mainly in spheroidal form and differs from gray cast iron. ASTM A536 specifies certain ductile iron casting grades. Cast steel must also be purchased under the appropriate casting material specification rather than treated as identical to forged alloy steel.

Stainless Steel for Specialized Planetary Gear Components

Stainless steel may be selected for certain corrosion-exposed mechanical transmission components. Grades such as 17-4 PH can be considered for suitable specified parts, while common austenitic stainless steels are not universal substitutes for conventional hardened gear steels.

SIMIS manufactures customer-defined stainless steel metal components according to their approved material and manufacturing requirements.

Applications of Custom Planetary Gear Components

Planetary gear components are used in various compact and heavy-duty transmission systems. SIMIS supplies customer-defined gear and carrier parts for equipment manufacturers serving automotive, robotics, wind power and industrial machinery markets.

Automotive and Commercial Vehicle Transmissions

Automatic transmissions and certain hybrid or electric vehicle drive systems use planetary gear arrangements to transmit motion between different mechanical elements. Sun gears, planet gears, ring gears and carriers are manufactured according to the particular transmission design.

SIMIS supplies suitable forged and cast metal components for customer-defined vehicle transmission applications. Related OEM gear products also include custom spur gears and other transmission parts.

Robotics, Servo Drives and Industrial Automation

Planetary reducers are used in selected robotic joints, servo drive systems and industrial automation equipment. Their compact gear arrangements can be suitable where the equipment requires specified gear reduction within a limited installation space.

SIMIS manufactures appropriate sun gear, planet gear and carrier components according to the OEM drawings. Planetary reducers are distinct from harmonic or strain-wave gear drives, which use a different transmission mechanism.

Wind Turbine Gearboxes and Energy Equipment

Wind turbines with conventional geared drivetrains may use planetary gear stages in the main gearbox. These arrangements commonly help increase rotational speed from the low-speed rotor side toward the higher-speed generator side.

Planetary gear components for this application can include substantial internal ring gears, planet gears, sun gears and carriers. SIMIS supplies suitable custom alloy steel forgings and cast metal components according to the wind power equipment manufacturer's approved requirements.

Mining, Construction and Heavy Industrial Equipment

Planetary transmissions are used in suitable construction machinery, mining equipment, conveyors, winches and heavy-duty industrial reducers. Their components vary according to the selected gearbox size and equipment duty.

SIMIS manufactures suitable forged steel gears, large ring gear blanks and cast carriers for approved industrial machinery projects.

Marine and Other Specialized Gearboxes

Marine and specialized industrial equipment may use planetary gear transmissions in selected propulsion-related drives, winches, positioning mechanisms and other machinery. The materials and gear construction depend on the relevant equipment requirements.

SIMIS manufactures suitable customer-defined metal parts and does not assume that one planetary gear arrangement or material grade is appropriate for every marine or industrial application.

Custom Planetary Gear Forgings and Castings Made to OEM Drawings

SIMIS specializes in OEM metal casting and forging for planetary transmission components. Our manufacturing range includes forged steel sun and planet gear blanks, ring-rolled internal ring gear blanks, cast steel carrier bodies, ductile iron gearbox components and related custom metal parts.

Suitable production methods include closed-die forging, open-die forging, seamless ring rolling, sand casting, shell mold casting and investment casting. Each process is selected according to the customer's material grade, component geometry and quantity requirements.

Customers may order forged blanks, castings or finished gear components. Where required, gear tooth cutting, CNC machining, heat treatment, surface finishing and inspection are provided according to the approved drawings and agreed supply scope.

Gear tooth accuracy, hardness, bearing interfaces and other finished-part requirements are defined by the customer. SIMIS does not assign a universal AGMA or ISO accuracy grade, backlash value, surface hardness or fatigue-life guarantee to every planetary gear order. The functional performance of a complete planetary gearbox also depends on its overall assembly and other components.

The following image shows a metal gear component with a bearing arrangement. It is retained as part of the original product-page imagery and does not imply that every planetary gear supplied by SIMIS includes bearings or is delivered as a complete assembly.

Request a Quote for Custom Planetary Gear Components

SIMIS welcomes OEM inquiries for forged sun gears, planet gears, internal ring gears, cast steel planet carriers and other custom planetary transmission components. We manufacture suitable metal parts according to customer drawings, specified materials and purchasing requirements.

For a quotation, please provide the following information where available:

• Product drawings: 2D technical drawings or available 3D CAD models.

• Component type: Sun gear, planet gear, internal ring gear, planet carrier or another specified planetary part.

• Material requirements: Specified carbon steel, alloy steel, cast steel, ductile iron or stainless steel grade.

• Product specifications: Main dimensions, module or diametral pitch and tooth count where applicable, or planet pin and mounting interfaces for carriers.

• Order requirements: Estimated quantity, intended gearbox application and whether forgings, castings or finished metal components are required.

Any additional gear accuracy, heat treatment, finishing or inspection requirements can be included in the customer's approved technical documents. SIMIS will quote the agreed material and manufacturing scope.

Send your custom planetary gear drawings and OEM inquiry to SIMIS: info@simis-group.com