INDUSTRY COMPONENT

Sun Gear

A central gear in planetary gear systems that meshes with planet gears to transmit torque and reduce speed.

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Component Specifications

Definition
The sun gear is the central component in a planetary gear system, typically located at the rotational axis. It engages with multiple planet gears arranged around it, which in turn mesh with an outer ring gear. This configuration allows for high torque transmission, compact design, and significant speed reduction ratios. Sun gears are critical in applications requiring precise speed control, load distribution, and efficient power transfer in confined spaces.
Working Principle
The sun gear rotates around its central axis, driving the planet gears that orbit around it. The planet gears are mounted on a carrier and also mesh with a stationary or rotating ring gear. This arrangement creates multiple gear meshes simultaneously, distributing the load and enabling high torque capacity with minimal space. The speed reduction ratio is determined by the number of teeth on the sun gear, planet gears, and ring gear, following the formula: Reduction Ratio = (Ring Gear Teeth / Sun Gear Teeth) + 1.
Materials
Typically made from alloy steels (e.g., AISI 4140, 4340) for strength and durability, often heat-treated (carburized or induction hardened) to achieve surface hardness of 58-62 HRC. Alternative materials include stainless steel for corrosion resistance or bronze for low-noise applications. Surface finishes may include grinding or honing to achieve precise tooth profiles and reduce friction.
Technical Parameters
  • Module 1.5-5 mm
  • Backlash 0.05-0.15 mm
  • Hardness 58-62 HRC
  • Face Width 10-50 mm
  • Accuracy Grade ISO 1328 Class 6-8
  • Pressure Angle 20°
  • Number of Teeth 15-40
Standards
ISO 1328, DIN 3960, AGMA 2000

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sun Gear.

sun gear planetary gear system reduction gears torque transmission speed reduction gear components industrial machinery Sun Gear in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Reduction Gears

Mechanical components that reduce rotational speed while increasing torque in robotic systems

View Product Details

Planetary Gear Set

A compact, high-torque gear arrangement consisting of central sun gear, multiple planet gears, and outer ring gear.

View Product Details

Planetary Gear Reducer

A compact, high-torque gear reduction mechanism that transmits and reduces rotational speed within a slewing unit.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Tooth wear due to improper lubrication
  • Misalignment causing uneven load distribution
  • Fatigue failure from cyclic loading
  • Overheating due to excessive friction
FMEA Triads
Trigger: Inadequate lubrication or contamination
Failure: Accelerated tooth wear and pitting
Mitigation: Implement regular lubrication schedules and use filtered oil systems; monitor oil quality and temperature.
Trigger: Misalignment during assembly
Failure: Uneven load distribution leading to premature failure
Mitigation: Use precision alignment tools during installation; perform periodic alignment checks and adjust as needed.
Trigger: Excessive torque or shock loads
Failure: Tooth breakage or deformation
Mitigation: Design with appropriate safety factors; install torque limiters or overload protection devices.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Tooth profile tolerance per ISO 1328 Class 6-8; backlash controlled within 0.05-0.15 mm
Test Method
Gear mesh analysis using coordinate measuring machines (CMM); hardness testing via Rockwell scale; fatigue testing under cyclic loading conditions

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of a sun gear?

The sun gear transmits rotational motion to the planet gears in a planetary system, enabling torque multiplication and speed reduction in a compact design.

How does a sun gear differ from a standard spur gear?

A sun gear is designed specifically for planetary configurations, meshing with multiple planet gears simultaneously, whereas a standard spur gear typically engages with a single gear. This allows for higher load capacity and efficiency in confined spaces.

What materials are commonly used for sun gears?

Alloy steels like AISI 4140 or 4340 are most common, often heat-treated for hardness. Stainless steel or bronze may be used for specialized applications requiring corrosion resistance or reduced noise.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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