Plates and panels
Fifth-Wheel Coupling Assembly
- Bounding box
- 330.0 × 450.0 × 147.0 mm
- Engine
- Precision B-rep
- Parameters
- 32
- Published
- September 19, 2026
Download
Free to download and use. See the terms.
The prompt
Design a **simple, compact and robust mechanical fifth-wheel coupling for a heavy-duty UGV** using the following specifications: * Coupled load: 10,000 kg * UGV mass: 1,500 kg * Max speed: 6 km/h * Emergency braking: 6 km/h to 0 within 2 m * Acceleration: 0.1 m/s² * Minimum FoS: 2.5 * Kingpin: Ø50.8 mm, EN19/EN24 heat-treated * Coupling size: approx. 330 × 330 × 110–120 mm * Target cost: ₹25,000–30,000 Use a **two-piece mechanical locking-jaw mechanism** with: * Two opposed pivoting jaws * Common mechanical locking shaft * Simple cam/over-center locking * Manual release lever * Positive secondary safety pawl * Springs only for return/preload, not load carrying * Replaceable kingpin, jaws and bushes * Fabricated steel body with laser-cut plates, ribs and CNC-machined jaws/pins Keep the design **as simple as possible with minimum moving parts**, low profile, strong direct load paths and easy local fabrication. Generate a clean **engineering concept sketch showing top, side, front, open and locked views**, with the kingpin, jaws, pivots, locking shaft, safety pawl and load path clearly indicated. This is a **preliminary concept only**, requiring detailed structural calculations, FEA and physical testing before use.
Parameters
| Name | Value | Range |
|---|---|---|
| Body length (X) | 330 mm | 200 – 500 |
| Body width (Y) | 330 mm | 200 – 500 |
| Body height (Z) | 115 mm | 80 – 200 |
| Top/bottom plate thickness | 12 mm | 8 – 25 |
| Kingpin diameter | 50.8 mm | 40 – 60 |
| Kingpin shank length | 120 mm | 80 – 200 |
| Kingpin flange thickness | 12 mm | 8 – 30 |
| Jaw length (front-rear) | 120 mm | 60 – 200 |
| Jaw width (left-right) | 80 mm | 40 – 160 |
| Jaw height | 45 mm | 20 – 80 |
| Pivot pin diameter | 25 mm | 16 – 40 |
| Pivot pin length | 90 mm | 50 – 150 |
| Bush inner diameter | 25 mm | 20 – 40 |
| Bush outer diameter | 35 mm | 30 – 60 |
| Bush length | 30 mm | 15 – 60 |
| Locking shaft diameter | 25 mm | 16 – 40 |
| Locking shaft length (X) | 180 mm | 120 – 300 |
| Cam length | 120 mm | 60 – 200 |
| Cam width | 40 mm | 20 – 80 |
| Cam height | 25 mm | 10 – 50 |
| Release lever length | 200 mm | 100 – 400 |
| Release lever width | 20 mm | 8 – 50 |
| Release lever height | 15 mm | 5 – 40 |
| Safety pawl length | 60 mm | 30 – 120 |
| Safety pawl width | 25 mm | 10 – 60 |
| Safety pawl height | 12 mm | 5 – 30 |
| Return spring diameter | 20 mm | 10 – 40 |
| Return spring length | 50 mm | 20 – 100 |
| Adapter plate length | 330 mm | 200 – 500 |
| Adapter plate width | 330 mm | 200 – 500 |
| Adapter plate thickness | 20 mm | 10 – 50 |
| Adapter bolt hole diameter | 14 mm | 8 – 30 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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