---
title: "Pivot Assembly (Trunnion)"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:PIVOT_ASSEMBLY_TRUNNION"
  data_integrity_hash: "9783283d31a490ef9fffdc811c171425"
  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:PIVOT_ASSEMBLY_TRUNNION"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/pivot-assembly-trunnion.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/pivot-assembly-trunnion"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-180 degrees rotation, 0-25 MPa hydraulic pressure, -40°C to 120°C temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 0.15
    unit: "mm"
    consequence: "Hertzian contact stress exceeding 1.5 GPa at bearing-race interface causing subsurface fatigue spalling, fretting corrosion at shaft-bushing interface due to micromotion &gt; 10 μm"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Misalignment &gt; 0.05 mm/m between trunnion axis and mounting surfaces"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Precision ground mounting surfaces with 0.01 mm flatness tolerance, laser alignment during assembly"
  - node_2:
      trigger: "Hydraulic fluid contamination &gt; ISO 4406 18/16/13"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 3 μm absolute filtration, implement condition-based oil analysis at 500-hour intervals"
bom_nodes:
  trunnion-shaft:
    type: "component"
    urn: "URN:CNFX:ME:TRUNNION_SHAFT"
    interface_type: "physical-logic-coupled"
  bearing-housing:
    type: "component"
    urn: "URN:CNFX:ME:BEARING_HOUSING"
    interface_type: "physical-logic-coupled"
  mounting-flange:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_FLANGE"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/pivot-assembly-trunnion.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "598664383dd802c27fc192f61eb4527c68d44b49cacb43730d840a712aa657c1"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Pivot Assembly (Trunnion)

## 1. Technical Definition
A mechanical assembly that provides a rotational pivot point for the hydraulic tilting mechanism, typically consisting of a trunnion shaft mounted within bearings or bushings.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-180 degrees rotation, 0-25 MPa hydraulic pressure, -40°C to 120°C temperature**. Failure boundary: **Trunnion shaft deflection exceeding 0.15 mm at mid-span under 50 kN radial load, bearing L10 life &lt; 10,000 hours at 100 RPM**, Mechanism: **Hertzian contact stress exceeding 1.5 GPa at bearing-race interface causing subsurface fatigue spalling, fretting corrosion at shaft-bushing interface due to micromotion &gt; 10 μm**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Misalignment &gt; 0.05 mm/m between trunnion axis and mounting surfaces | 8 | Accelerated bearing wear with vibration amplitude &gt; 2.5 mm/s RMS at 100 Hz | Precision ground mounting surfaces with 0.01 mm flatness tolerance, laser alignment during assembly |
| Hydraulic fluid contamination &gt; ISO 4406 18/16/13 | 8 | Abrasive wear of bushings increasing clearance &gt; 0.1 mm, causing 15% efficiency loss | Install 3 μm absolute filtration, implement condition-based oil analysis at 500-hour intervals |

## 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**: **Hydraulic Power Unit**, **CNC Machining Center**, **Coordinate Measuring Machine**  
**Downstream Applications**: Excavators, Construction Cranes, Agricultural Harvesters  

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

### Q: What materials are used in this Pivot Assembly?
**A**: Our Pivot Assembly is constructed from high-grade Alloy Steel and Hardened Steel components, ensuring maximum durability and load-bearing capacity for industrial applications.

### Q: What are the main components of this trunnion assembly?
**A**: The assembly includes three key components: Bearing Housing for smooth rotation, Mounting Flange for secure installation, and Trunnion Shaft that provides the central pivot point for hydraulic tilting mechanisms.

### Q: What types of machinery use this pivot assembly?
**A**: This Pivot Assembly is designed for heavy machinery and equipment manufacturing applications, particularly in systems requiring hydraulic tilting or rotational movement such as construction equipment, industrial presses, and material handling systems.

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

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Pivot Assembly (Trunnion)](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/pivot-assembly-trunnion)**

### 🌐 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**: PIVOT_ASSEMBLY_TRUNNION | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: f3aaa945
