---
title: "End Trucks"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:END_TRUCKS"
  data_integrity_hash: "0e5071491eeedd5e7547be28ab68d547"
  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:END_TRUCKS"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/end-trucks.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/end-trucks"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "5-25 kN/m² wheel loading pressure, 0.1-2.0 m/s horizontal travel speed, -40°C to +80°C ambient temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 450
    unit: "MPa"
    consequence: "Hertzian contact stress fatigue at wheel-rail interface due to cyclic loading exceeding material endurance limit (approximately 0.5×ultimate tensile strength), thermal expansion differential between steel components (coefficient: 11.7×10⁻⁶/°C) causing binding, Brinell surface hardening leading to subsurface crack propagation"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Runway rail wear exceeding 15% of original cross-sectional area"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Hardened rail surface treatment (55-62 HRC) with ultrasonic thickness monitoring at 100-hour intervals"
  - node_2:
      trigger: "Bearing lubrication degradation due to water ingress exceeding 0.5% contamination"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "IP67-rated sealed bearing housings with capacitive moisture sensors triggering at 40% RH internal"
bom_nodes:
  wheel-assembly:
    type: "part"
    urn: "URN:CNFX:ME:WHEEL_ASSEMBLY"
    interface_type: "physical-logic-coupled"
  drive-motor-mounting:
    type: "component"
    urn: "URN:CNFX:ME:DRIVE_MOTOR_MOUNTING"
    interface_type: "physical-logic-coupled"
  brake-assembly:
    type: "part"
    urn: "URN:CNFX:ME:BRAKE_ASSEMBLY"
    interface_type: "physical-logic-coupled"
  wheel-bearing-housing:
    type: "part"
    urn: "URN:CNFX:ME:WHEEL_BEARING_HOUSING"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/end-trucks.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "f0a56d98590f2d48ffaf5867bfce38859c10497d8f3ecd8c12b409571d69873f"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: End Trucks

## 1. Technical Definition
Structural components at the ends of a crane bridge that support the bridge girders and house the wheels for horizontal movement along the runway rails.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **5-25 kN/m² wheel loading pressure, 0.1-2.0 m/s horizontal travel speed, -40°C to +80°C ambient temperature**. Failure boundary: **Wheel flange contact stress exceeding 450 MPa (yield strength of ASTM A36 steel), wheel bearing temperature exceeding 120°C (grease breakdown point), runway rail misalignment exceeding 3 mm/m**, Mechanism: **Hertzian contact stress fatigue at wheel-rail interface due to cyclic loading exceeding material endurance limit (approximately 0.5×ultimate tensile strength), thermal expansion differential between steel components (coefficient: 11.7×10⁻⁶/°C) causing binding, Brinell surface hardening leading to subsurface crack propagation**.

### 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 |
| :--- | :--- | :--- | :--- |
| Runway rail wear exceeding 15% of original cross-sectional area | 8 | Wheel flange climbing and derailment during lateral loading | Hardened rail surface treatment (55-62 HRC) with ultrasonic thickness monitoring at 100-hour intervals |
| Bearing lubrication degradation due to water ingress exceeding 0.5% contamination | 8 | Seizure-induced wheel lock at 1.5 m/s travel speed | IP67-rated sealed bearing housings with capacitive moisture sensors triggering at 40% RH internal |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Wheel Assembly](https://cnfx.com/llms/industry/other-transport-equipment-manufacturing/product/wheel-assembly.md) `(Standalone System)`
- [Brake Assembly](https://cnfx.com/llms/industry/other-transport-equipment-manufacturing/product/brake-assembly.md) `(Standalone System)`
- [Wheel Bearing Housing](https://cnfx.com/llms/industry/other-transport-equipment-manufacturing/product/wheel-bearing-housing.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Crane Bridge Girders**, **Runway Rails**, **Wheel Drive Motors**  
**Downstream Applications**: Overhead Cranes, Gantry Cranes, Bridge Cranes  

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

### Q: What are the main components of an end truck?
**A**: End trucks consist of wheel assemblies, drive motor mounting systems, brake assemblies, and wheel bearing housings, all constructed from structural steel for durability.

### Q: How do end trucks support crane bridge operation?
**A**: End trucks are structural components positioned at crane bridge ends that support bridge girders and house wheels for horizontal movement along runway rails.

### Q: What materials are used in manufacturing end trucks?
**A**: End trucks are manufactured from high-grade structural steel to withstand heavy loads and harsh industrial environments in machinery applications.

## 6. Manufacturing Compliance

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: End Trucks](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/end-trucks)**

### 🌐 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**: END_TRUCKS | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: d9c57d84
