---
title: "Upper structure"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:UPPER_STRUCTURE"
  data_integrity_hash: "7989dddd7194a79214b805f9b180183e"
  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:UPPER_STRUCTURE"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/upper-structure.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/upper-structure"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-360° continuous rotation at 0.5-8 rpm, bearing load capacity 150-450 kN, hydraulic pressure 210-350 bar"
    unit: "kg"
engineering_limits:
  max_safe_operating_point:
    value: 500
    unit: "kN"
    consequence: "Hertzian contact stress exceeding bearing material yield strength (typically 690 MPa for 42CrMo4 steel), hydraulic fluid compressibility leading to pressure spikes exceeding component burst ratings"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Slewing ring bearing contamination with abrasive particles &gt;50 μm"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Triple-lip seal design with grease purge system, bearing material upgrade to through-hardened 100Cr6 steel (HRC 58-62)"
  - node_2:
      trigger: "Hydraulic system thermal expansion coefficient mismatch (Δα = 12×10⁻⁶/°C between steel and aluminum components)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Finite element analysis-optimized rib structure with thermal compensation joints, controlled expansion alloy selection"
bom_nodes:
  slewing-ring:
    type: "part"
    urn: "URN:CNFX:ME:SLEWING_RING"
    interface_type: "physical-logic-coupled"
  operators-cab:
    type: "part"
    urn: "URN:CNFX:ME:OPERATORS_CAB"
    interface_type: "physical-logic-coupled"
  counterweight:
    type: "component"
    urn: "URN:CNFX:ME:COUNTERWEIGHT"
    interface_type: "physical-logic-coupled"
  hydraulic-pump-mounting-frame:
    type: "part"
    urn: "URN:CNFX:ME:HYDRAULIC_PUMP_MOUNTING_FRAME"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING FOR CONSTRUCTION PRODUCTS REGULATION (EU) NO 305/2011"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/upper-structure.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "330d27359537c9468e99ed327a423bcb94aa751b8a36d29a05df6275f1e93836"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Upper structure

## 1. Technical Definition
The rotating platform assembly of a wheeled excavator that houses the operator's cab, engine, hydraulic systems, and boom attachment.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-360° continuous rotation at 0.5-8 rpm, bearing load capacity 150-450 kN, hydraulic pressure 210-350 bar**. Failure boundary: **Slewing ring bearing fatigue failure at &gt;10⁷ cycles under 500 kN radial load, hydraulic system failure at &gt;380 bar pressure**, Mechanism: **Hertzian contact stress exceeding bearing material yield strength (typically 690 MPa for 42CrMo4 steel), hydraulic fluid compressibility leading to pressure spikes exceeding component burst ratings**.

### 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 |
| :--- | :--- | :--- | :--- |
| Slewing ring bearing contamination with abrasive particles &gt;50 μm | 8 | Accelerated bearing raceway pitting and spalling | Triple-lip seal design with grease purge system, bearing material upgrade to through-hardened 100Cr6 steel (HRC 58-62) |
| Hydraulic system thermal expansion coefficient mismatch (Δα = 12×10⁻⁶/°C between steel and aluminum components) | 8 | Structural deformation causing gear meshing misalignment &gt;0.1 mm | Finite element analysis-optimized rib structure with thermal compensation joints, controlled expansion alloy selection |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Slewing Ring](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/slewing-ring.md) `(Standalone System)`
- [Operator's Cab](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/operators-cab.md) `(Standalone System)`
- [Hydraulic Pump Mounting Frame](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/hydraulic-pump-mounting-frame.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Hydraulic Power Unit**, **Engine Cooling System**, **Electrical Control Panel**  
**Downstream Applications**: Wheeled Excavator, Construction Equipment, Heavy Machinery  

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

### Q: What materials are used in the upper structure for durability?
**A**: The upper structure is constructed from high-strength steel, cast steel, and alloy steel to withstand heavy loads and harsh operating conditions in machinery applications.

### Q: How does the slewing ring integrate with the upper structure?
**A**: The slewing ring is a critical BOM component that enables 360-degree rotation of the upper structure, allowing the excavator to swing the cab and boom independently of the undercarriage.

### Q: What maintenance does the hydraulic pump mounting frame require?
**A**: Regular inspection for stress cracks and proper bolt torque is essential. The frame should be kept clean from debris to ensure hydraulic system efficiency and prevent contamination.

## 6. Manufacturing Compliance
- ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS
- CE MARKING FOR CONSTRUCTION PRODUCTS REGULATION (EU) NO 305/2011

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Upper structure](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/upper-structure)**

### 🌐 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**: UPPER_STRUCTURE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: c653a64a
