---
title: "Cross/Yoke Assembly"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CROSSYOKE_ASSEMBLY"
  data_integrity_hash: "ca0e953bba333c568fd35d7a5eb2b50d"
  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:CROSSYOKE_ASSEMBLY"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/crossyoke-assembly.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/crossyoke-assembly"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-45° angular misalignment, 100-6000 N·m torque transmission, -40°C to 120°C operating temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 300
    unit: "HB"
    consequence: "Hertzian contact fatigue at needle roller-bearing surfaces due to cyclic loading exceeding material endurance limit of 4140 steel (σ_endurance = 620 MPa)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Insufficient lubrication film thickness (&lt;1 μm) at needle bearing interfaces"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Forced lubrication system with 0.1 mm diameter oil passages and minimum 0.3 MPa supply pressure"
  - node_2:
      trigger: "Cyclic torsional loading exceeding 7000 N·m at 15 Hz frequency"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Shot peening treatment achieving 400 MPa compressive residual stress at surface, increasing fatigue strength by 30%"
bom_nodes:
  cross-spider:
    type: "part"
    urn: "URN:CNFX:ME:CROSS_SPIDER"
    interface_type: "physical-logic-coupled"
  yoke:
    type: "component"
    urn: "URN:CNFX:ME:YOKE"
    interface_type: "physical-logic-coupled"
  needle-bearings:
    type: "component"
    urn: "URN:CNFX:ME:NEEDLE_BEARINGS"
    interface_type: "physical-logic-coupled"
  bearing-cups:
    type: "component"
    urn: "URN:CNFX:ME:BEARING_CUPS"
    interface_type: "physical-logic-coupled"
  grease-seals:
    type: "component"
    urn: "URN:CNFX:ME:GREASE_SEALS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/crossyoke-assembly.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "3b234449ce5d12ad8c0c6b76fd817665244153c293d4946f5bd17a57d8aa099a"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Cross/Yoke Assembly

## 1. Technical Definition
The central rotating component of a universal joint that transmits torque between shafts at varying angles.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-45° angular misalignment, 100-6000 N·m torque transmission, -40°C to 120°C operating temperature**. Failure boundary: **Brinell hardness drop below 300 HB at bearing surfaces, angular deflection exceeding 47°, contact stress surpassing 1500 MPa at needle bearing interfaces**, Mechanism: **Hertzian contact fatigue at needle roller-bearing surfaces due to cyclic loading exceeding material endurance limit of 4140 steel (σ_endurance = 620 MPa)**.

### 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 |
| :--- | :--- | :--- | :--- |
| Insufficient lubrication film thickness (&lt;1 μm) at needle bearing interfaces | 8 | Adhesive wear and galling at trunnion-bearing surfaces | Forced lubrication system with 0.1 mm diameter oil passages and minimum 0.3 MPa supply pressure |
| Cyclic torsional loading exceeding 7000 N·m at 15 Hz frequency | 8 | Fatigue crack initiation at fillet radii (R=2 mm) of yoke arms | Shot peening treatment achieving 400 MPa compressive residual stress at surface, increasing fatigue strength by 30% |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Cross Spider](https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/cross-spider.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Machining Center**, **Heat Treatment Furnace**, **Coordinate Measuring Machine**  
**Downstream Applications**: Driveshaft Assembly, Steering Column Assembly, Power Take-Off Unit  

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

### Q: What is the primary function of a cross/yoke assembly in motor vehicles?
**A**: The cross/yoke assembly serves as the central rotating component of a universal joint, transmitting torque between drive shafts that operate at varying angles while accommodating suspension movement and steering articulation.

### Q: What are the advantages of using case-hardened steel in cross/yoke assemblies?
**A**: Case-hardened steel provides an extremely hard, wear-resistant surface layer while maintaining a tough, ductile core. This combination offers superior durability, fatigue resistance, and extended service life under high-torque conditions in vehicle drivetrains.

### Q: How often should cross/yoke assemblies be inspected in commercial vehicles?
**A**: For commercial vehicles, cross/yoke assemblies should be inspected during every scheduled maintenance interval (typically every 25,000-50,000 miles) and whenever driveline vibration or unusual noises are detected. Regular lubrication and seal inspection are crucial for preventing premature failure.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Cross/Yoke Assembly](https://cnfx.com/industry/motor-vehicle-manufacturing/product/crossyoke-assembly)**

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

> **Reference ID**: CROSSYOKE_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 2b765956
