What Is a Sun Gear in a Planetary Gear System?
Understand the sun gear, planet gears, internal ring gear and carrier before specifying a replacement.
KNOWLEDGE
Sun Gear Knowledge Center
Practical guides for identifying, selecting, measuring and quoting sun gears in planetary systems.
IdentificationSelectionReplacement
Sun gear technical guides
The articles answer the questions that most often block a planetary gear RFQ.
Sun Gear vs. Planet Gear vs. Ring Gear
Compare the three gear elements in a planetary stage and see which dimensions must match.
Sun Gear Module, DP and Pressure Angle
The pitch system and pressure angle must agree with the mating planet gears.
Sun Gear Tooth Count and Planetary Geometry
Why tooth counts, center distance and planet spacing must be considered together.
Splined Sun Gear Interfaces: What to Measure
Spline standard, tooth count, major/minor diameters, fit, length and datum relationships.
Sun Gear Shaft vs. Separate Sun Gear
When the sun gear is integrated with a shaft, bearing and drive-interface details become part of the gear drawing.
Sun Gear Materials and Heat Treatment: RFQ Checklist
Define material, hardness, case requirement and inspection from the duty and controlled drawing.
Sun Gear Backlash and Tooth Contact
Backlash is a system result involving the sun, planets, ring gear, bearing/support accuracy and tooth modifications.
How to Measure a Sun Gear for Replacement
A practical measurement checklist for old planetary components when the original drawing is missing.
Custom Sun Gear RFQ Inputs That Matter
A complete RFQ combines gear geometry, shaft/spline interface, duty, quality and commercial information.
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.
