Central sun gears for new planetary stages, replacement assemblies and custom epicyclic mechanisms.

Construction and engineering scope

The sun gear meshes simultaneously with multiple planet gears, so tooth geometry, concentricity, shaft interface and heat treatment have direct influence on load sharing and noise.

Planetary gear interface data required for engineering review

Additional engineering views

Close-up of precision gear teeth and gear mesh surfaces — Gear-mesh detail for tooth geometry, surface finish and inspection discussion.

Three-planet epicyclic stage showing sun gear, planet gears and internal ring gear — Three-planet epicyclic stage illustration showing the relationship between sun, planets and ring.

Technical parameters

Tooth count	by drawing / matched gear set
Module / DP	by drawing
Pressure angle	by drawing; 20° is common
Bore / spline	plain, keyed, splined or integral shaft by drawing
Material options	case-hardening or alloy steels by duty
Surface condition	ground, shaved or finished as specified

Typical configurable options are shown for RFQ planning only. Final values are fixed by the approved drawing, material specification, heat treatment, ratio, duty and inspection plan.

Applications and selection

For a replacement sun gear, send the mating planet and ring data as well as bore/spline dimensions. Tooth count alone is not enough to ensure compatibility.

Customization options

Engineering review can cover tooth count and ratio, spur or helical geometry, material and heat treatment, motor or shaft interface, output flange or spline, bearing arrangement, lubrication, sealing, backlash class and inspection documentation. Features are confirmed against the approved drawing rather than assumed from a similar model.

Installation and maintenance

Check shaft alignment, pilot fit, fastener grade and tightening method before commissioning. Do not exceed the confirmed continuous or peak torque, radial load, axial load or input speed. For replacement work, verify the mounting drawing and output interface before ordering.

Quality and inspection

Inspection planning can include material traceability, hardness, tooth geometry, runout, dimensional inspection and assembly checks according to the RFQ and approved quality plan. Ask for the required inspection level before quotation.

FAQ

Can you manufacture from a drawing or sample?

Yes, the engineering review can start from a drawing, sample, tooth data or a complete gearbox identification. Final feasibility is confirmed after dimensional and material review.

What information is needed for a replacement?

Send model or nameplate, quantity, ratio, motor or input speed, output torque or duty, shaft/flange dimensions, mounting drawing and clear photos. For individual gears, add tooth count, module or DP, pressure angle, face width and material/heat-treatment requirements if known.

RFQ checklist: product/model, quantity, application, ratio or tooth data, continuous and peak torque, input speed, backlash target, material/heat treatment, interface drawing and inspection requirements. Email sales@gearing-epicyclic.top.

Sun Gears

Custom Sun Gear

Custom Sun Gear

Custom Sun Gear

Custom Sun Gear

Custom Sun Gear