Custom Sun Gears for Planetary Gear Systems
EVER POWER supplies drawing-based sun gears, sun gear shafts and matched planetary components for reducers, transmissions and compact coaxial drive systems.
Start with the central gear, then define the complete mesh.
A sun gear is the central external gear in a planetary stage. It works with the planet gears, internal ring gear and carrier, so the useful product definition goes beyond outside diameter.
Spur Sun Gears
Straight-tooth sun gears made to drawing for planetary reducers and transmissions.
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Helical Sun Gears
Helical sun gears with drawing-controlled helix angle, hand and mating geometry.
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Ground & Heat-Treated Sun Gears
Hard-finished, carburized or nitrided configurations selected from the approved design.
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Splined Sun Gears
Internal spline and other torque-transmitting bore interfaces integrated into the sun gear.
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Sun Gear Shafts
Integral gear shafts combining teeth with journals, splines, shoulders and end features.
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Planetary Gear Components
Planet gears, internal ring gears, carriers and pins for matched planetary projects.
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Tooth geometry and interface data drive the quotation.
For a new or replacement sun gear, send module or DP, tooth count, pressure angle, spur/helical form, face width and the bore, spline or shaft interface. Helical parts also need helix angle and hand. Material, heat treatment and gear-quality requirements should remain exactly as the released drawing specifies.
If a drawing is incomplete, send the mating planet and ring information plus torque, speed and duty. That gives the technical review enough context to identify what must be confirmed before production.
Sun gears are supplied in more than one mechanical form.
Planetary gearing appears wherever compact coaxial transmission is valuable.
Different applications put different emphasis on duty, noise, backlash, material, inspection and replacement risk.
Planetary Gearboxes
Reducer stages where sun, planet, ring and carrier geometry must work as one system.
View detailsRobotics & Automation
Compact servo and automation gearheads where runout, interface accuracy and duty cycles matter.
View detailsConstruction & Final Drives
High-torque planetary stages exposed to shock, reversal and demanding spline interfaces.
View detailsAutomotive & EV Transmissions
Planetary gearsets for vehicle power-flow, reduction and transmission functions.
View detailsWind Turbine Gearboxes
Loaded planetary stages where fatigue, contact, hard finishing and load sharing are central.
View detailsIndustrial Machinery
Custom reducers and special machines with drawing-controlled planetary components.
View detailsA quotation path built around a planetary gear component.
Send drawing & planetary data
PDF/STEP, revision, quantity, application and any available mating-gear information.
Confirm tooth geometry
Module/DP, tooth count, pressure angle, spur/helical form, helix angle and hand.
Confirm interfaces
Bore, spline, shaft, journals, shoulders and functional datum relationships.
Plan material & treatment
Keep material, carburizing/nitriding/hardness and case requirements tied to the approved design.
Manufacture & hard-finish
Sequence turning, gear cutting, spline work, heat treatment and grinding as required.
Inspect controlled features
Check tooth geometry together with bore/spline/journal and face relationships.
Pack & ship
Export packing and the agreed Incoterm for the released quantity.
Hardness alone does not define a good sun gear.
Tooth accuracy has to be controlled relative to the bore, spline, journals and locating faces that center the component in the gearbox. The manufacturing route can include soft machining, gear cutting, heat treatment, hard finishing and final gear inspection, with the sequence chosen from the drawing and duty.
For matched planetary sets, the plan also considers the planet gears and internal ring gear so mesh relationships are not reviewed in isolation.
Prepare a better Sun Gear RFQ.
Use the guides below to confirm terminology, interface data and manufacturing choices before releasing an order.
What Is a Sun Gear?
Understand the central gear, planet gears, internal ring and carrier as one planetary mechanism.
View detailsSpur vs Helical Sun Gears
Compare tooth geometry, axial force, mating data and replacement risks.
View detailsHow to Specify a Custom Sun Gear
A practical RFQ checklist covering teeth, splines, materials, quality and planetary context.
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