Standard Sun Gears
External sun gears for planetary stages where tooth count, module/DP and mating geometry are defined by the transmission design.
PRECISION PLANETARY GEAR COMPONENTS
Precision Sun Gears for Planetary Gear Systems
EVER POWER supplies standard and drawing-based sun gears, splined sun gears and sun gear shafts for planetary transmissions. Selection starts with the mating planet gears and ring gear, then confirms tooth geometry, interface, material, heat treatment and inspection.
Sun GearsSun Gear ShaftsCustom to Drawing
Sun gear products built around the planetary stage
The sun gear is the central external gear in a planetary train. The correct part cannot be selected from outside diameter alone; tooth count, pitch system, pressure angle, profile shift, bore or spline and the mating planets all matter.
Splined Sun Gears
Sun gears with internal or external spline interfaces for torque transfer and repeatable assembly into planetary drivetrains.
Sun Gear Shafts
Integrated gear-and-shaft parts for layouts where the sun gear is combined with a journal, spline, bearing seat or drive interface.
Hollow Sun Gears
Bored or hollow sun gears for coaxial shafts, sleeves and compact planetary arrangements.
Custom Sun Gears
Drawing-based gears built around tooth geometry, bore or spline, material, heat treatment, finish and inspection requirements.
Planetary Gear Components
Related planet gears, ring gears and matched component sets when the project requires system-level review.
How the sun gear fits the planetary system
A planetary stage normally combines a sun gear, multiple planet gears, an internal ring gear and a carrier. The sun gear may be the input, output or fixed member depending on the transmission arrangement.
For replacement work, the mating planet gears and ring gear are part of the identification problem. Matching only the visible diameter can produce a gear that fits physically but will not mesh correctly.
RFQ inputs that remove most ambiguity
A useful sun gear quotation starts with the gear mesh and shaft interface, not only the part name.
Tooth geometry
Module or DP, pressure angle, tooth count, helix angle when applicable, profile shift and any tip/root modifications.
Mating gears
Planet-gear tooth count, ring-gear tooth count and the required center-distance relationship.
Bore / spline / shaft
Plain bore, keyway, internal spline, external spline or integrated shaft dimensions and fits.
Material & heat treatment
State the drawing requirement, hardness target, case depth or equivalent project specification where controlled.
Load & duty
Torque, speed, starts/reversals, shock level, expected service life and operating environment.
Inspection
Specify the required tooth, runout, concentricity, spline and material/heat-treatment records.
Applications where sun gear details change the decision
Different machines place different demands on the same basic planetary component.
Planetary Gearboxes
Sun gears at the center of industrial planetary stages, from compact reducers to high-torque transmissions.
Construction & Heavy Machinery
Planetary hub, travel and drive systems where shock load, tooth strength and heat treatment are key RFQ inputs.
Renewable Energy
Planetary stages used in wind and other energy equipment, with emphasis on torque, life, load distribution and inspection.
Agricultural Machinery
Compact drives, hubs and mobile machinery requiring durable planetary gearing and practical replacement support.
Industrial Automation
Servo, indexing and motion systems where concentricity, backlash, spline fit and repeatability matter.
Manufacturing and inspection are part of the gear definition
Sun gears may require turning, hobbing or shaping, heat treatment, finish grinding and spline machining depending on the drawing and duty. The process route should follow the gear geometry and quality requirement rather than a generic one-size-fits-all recipe.
For critical replacements, inspection planning should be agreed before production so the buyer knows which dimensions and tooth characteristics will be reported.
RFQ
Request a Quote / Send RFQ
Send the drawing, tooth data, mating-component information, duty and quantity. We will review the interface before quotation.
MOQFlexible by product type and total order value.
SamplesNew customers may request 1-5 pieces when the part and process are suitable.
Mixed ordersDifferent sun gear or related planetary-component models can be combined when the total order value is around USD 1,500 or above.
Small ordersOrders from 1-2 pieces can be discussed, normally with a higher unit cost.
DeliveryStandard parts: 10-25 working days. Custom components: 20-45 working days. Project equipment: 45-120 working days.
Trade termsEXW, FOB, CIF and DAP are commonly supported. FCA, CFR, CPT, CIP and DDP can be discussed case by case.
