---
title: "Wheel Hub"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:WHEEL_HUB"
  data_integrity_hash: "72e0a9a9bfc9406bd40897a0908476a8"
  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:WHEEL_HUB"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/wheel-hub.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/wheel-hub"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-1500 N·m torque, -40°C to 120°C temperature, 0-3000 rpm rotational speed"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 450
    unit: "MPa"
    consequence: "High-cycle fatigue from alternating bending stresses at stress concentration points (notches, holes), fretting corrosion at spline interfaces, bearing raceway spalling from subsurface shear stress exceeding material endurance limit"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Improper interference fit between hub bore and axle (0.05-0.15 mm interference required)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Precision ground spline surfaces with Ra 0.8 μm finish, controlled press-fit assembly with 50-100 kN hydraulic press force"
  - node_2:
      trigger: "Insufficient bearing preload (requires 0.02-0.05 mm axial play elimination)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Angular contact bearing pairs with matched preload, precision spacer rings with ±0.005 mm length tolerance"
bom_nodes:
  wheel-bearing:
    type: "component"
    urn: "URN:CNFX:ME:WHEEL_BEARING"
    interface_type: "physical-logic-coupled"
  hub-flange:
    type: "component"
    urn: "URN:CNFX:ME:HUB_FLANGE"
    interface_type: "physical-logic-coupled"
  wheel-studs:
    type: "component"
    urn: "URN:CNFX:ME:WHEEL_STUDS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 4100:2015 - WHEELS AND RIMS FOR COMMERCIAL VEHICLES"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/wheel-hub.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "1226b41cf2cc293ceeffef066b26b7b707ece0ca652bb4f03830f79314a9df1d"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Wheel Hub

## 1. Technical Definition
The central rotating component of a drive wheel that connects to the axle and supports the wheel rim.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-1500 N·m torque, -40°C to 120°C temperature, 0-3000 rpm rotational speed**. Failure boundary: **Material yield strength exceeded at 450 MPa stress, bearing fatigue life L10=1×10⁶ cycles, 0.5 mm radial runout tolerance exceeded**, Mechanism: **High-cycle fatigue from alternating bending stresses at stress concentration points (notches, holes), fretting corrosion at spline interfaces, bearing raceway spalling from subsurface shear stress exceeding material endurance limit**.

### 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 |
| :--- | :--- | :--- | :--- |
| Improper interference fit between hub bore and axle (0.05-0.15 mm interference required) | 8 | Hub-axle relative rotation causing spline wear and torque transfer loss | Precision ground spline surfaces with Ra 0.8 μm finish, controlled press-fit assembly with 50-100 kN hydraulic press force |
| Insufficient bearing preload (requires 0.02-0.05 mm axial play elimination) | 8 | Bearing skidding during acceleration/deceleration, leading to raceway smearing and premature spalling | Angular contact bearing pairs with matched preload, precision spacer rings with ±0.005 mm length tolerance |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Machining Center**, **Heat Treatment Furnace**, **Wheel Balancer**  
**Downstream Applications**: Passenger Vehicles, Commercial Trucks, Motorcycles  

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

### Q: What materials are best for wheel hubs in high-performance vehicles?
**A**: Forged steel offers maximum strength for heavy loads, while aluminum alloy reduces weight for better performance and fuel efficiency in racing or sports cars.

### Q: How do I know when a wheel hub needs replacement?
**A**: Common signs include grinding noises from wheels, vibration in steering, uneven tire wear, or ABS warning lights. Regular inspection of wheel bearings and hub flanges is recommended.

### Q: What's included in a complete wheel hub assembly?
**A**: A full assembly typically includes the hub flange, wheel bearings, wheel studs, and sometimes integrated ABS sensors, designed for direct bolt-on installation.

## 6. Manufacturing Compliance
- ISO 4100:2015 - WHEELS AND RIMS FOR COMMERCIAL VEHICLES

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Wheel Hub](https://cnfx.com/industry/motor-vehicle-manufacturing/product/wheel-hub)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: WHEEL_HUB | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: dec32d6a
