---
title: "Planetary Gear Set"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:PLANETARY_GEAR_SET"
  data_integrity_hash: "db8b132ca8c7cfea651e545b93e4e0af"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:PLANETARY_GEAR_SET"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/planetary-gear-set.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/planetary-gear-set"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-6000 rpm input speed, 0-500 N·m input torque, -40°C to 120°C operating temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 1200
    unit: "MPa"
    consequence: "Micropitting fatigue due to elastohydrodynamic lubrication film collapse at lambda ratio &lt;1.0, causing asperity contact and subsurface shear stress exceeding material endurance limit (Goodman diagram)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Misalignment exceeding 0.05 mm/mm from manufacturing tolerance stack-up or housing deflection under 500 N·m load"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integral carrier design with 0.02 mm positional tolerance and ISO 1328-1:2013 gear quality 6 specification"
  - node_2:
      trigger: "Insufficient EP additive concentration (&lt;1.5% sulfur-phosphorus) in lubricant at 90°C operating temperature"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Forced lubrication system with 10 μm filtration and inline viscosity monitoring maintaining ISO VG 320 at 40°C"
bom_nodes:
  sun-gear:
    type: "component"
    urn: "URN:CNFX:ME:SUN_GEAR"
    interface_type: "physical-logic-coupled"
  planet-gears:
    type: "component"
    urn: "URN:CNFX:ME:PLANET_GEARS"
    interface_type: "physical-logic-coupled"
  planet-carrier:
    type: "part"
    urn: "URN:CNFX:ME:PLANET_CARRIER"
    interface_type: "physical-logic-coupled"
  ring-gear:
    type: "component"
    urn: "URN:CNFX:ME:RING_GEAR"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 1328-1:2013 CYLINDRICAL GEARS - ISO SYSTEM OF FLANK TOLERANCE CLASSIFICATION"
    scope: "Verified Engineering Specification"
  - standard: "DIN 3961:1978 TOLERANCES FOR CYLINDRICAL GEAR TEETH"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/planetary-gear-set.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "a1734f2ad77b1ba583a376f54f7f1ba846dbcd87b15c3631624ec87b82fd958c"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Planetary Gear Set

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

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-6000 rpm input speed, 0-500 N·m input torque, -40°C to 120°C operating temperature**. Failure boundary: **Planet gear tooth bending stress exceeds 1200 MPa (SAE 8620 steel yield strength), ring gear hoop stress exceeds 900 MPa, or sun gear contact stress exceeds 1800 MPa (Hertzian contact limit)**, Mechanism: **Micropitting fatigue due to elastohydrodynamic lubrication film collapse at lambda ratio &lt;1.0, causing asperity contact and subsurface shear stress exceeding material endurance limit (Goodman diagram)**.

### 2.1 Analytical Physics Model
Governed by the **L10 Bearing Life & Fatigue Model**:

> **Primary Equation**: $L_{10} = (\frac{C}{P})^p$  
> **Engineering Impact**: Predicts mechanical lifecycle before component fatigue.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| C | Dynamic Load Rating | Engineering Constant |
| P | Equivalent Dynamic Load | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Misalignment exceeding 0.05 mm/mm from manufacturing tolerance stack-up or housing deflection under 500 N·m load | 8 | Uneven load distribution causing single planet gear tooth bending fatigue fracture at 10⁷ cycles (Wöhler curve) | Integral carrier design with 0.02 mm positional tolerance and ISO 1328-1:2013 gear quality 6 specification |
| Insufficient EP additive concentration (&lt;1.5% sulfur-phosphorus) in lubricant at 90°C operating temperature | 8 | Scoring wear on ring gear internal teeth with material removal rate &gt;0.01 mm/1000 hours (Archard's wear law) | Forced lubrication system with 10 μm filtration and inline viscosity monitoring maintaining ISO VG 320 at 40°C |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Planet Carrier](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/planet-carrier.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Gear Hobbing Machine**, **Gear Grinding Machine**, **Coordinate Measuring Machine**  
**Downstream Applications**: Industrial Gearboxes, Automotive Transmissions, Wind Turbine Drivetrains  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What are the main advantages of a planetary gear set in machinery?
**A**: Planetary gear sets offer high torque density, compact size, and excellent load distribution due to multiple planet gears sharing the load, making them ideal for space-constrained industrial applications.

### Q: What materials are used in your planetary gear sets?
**A**: Our planetary gear sets use alloy steel and case-hardened steel for gears to ensure strength and wear resistance, with bronze bushings for smooth operation and reduced friction.

### Q: What components are included in a planetary gear set BOM?
**A**: A complete planetary gear set includes a sun gear, multiple planet gears, a planet carrier to hold the planet gears, and an outer ring gear, all precision-engineered for optimal performance.

## 6. Manufacturing Compliance
- ISO 1328-1:2013 CYLINDRICAL GEARS - ISO SYSTEM OF FLANK TOLERANCE CLASSIFICATION
- DIN 3961:1978 TOLERANCES FOR CYLINDRICAL GEAR TEETH

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Planetary Gear Set](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/planetary-gear-set)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: PLANETARY_GEAR_SET | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: b98a9c65
