⚙ Speed Gearbox Mechanism

Gearboxes, also known as gear reducers or enclosed speed reducers, are essential components in many electromechanical drive systems. They consist of multiple open gear sets housed in a casing that supports bearings and shafts, retains lubricants, and shields the system from external conditions.

✅ Purpose of Gearboxes

• To increase or reduce speed in a drive system
• Torque output varies inversely with speed
• Speed reduction leads to torque amplification
• Speed increase results in reduced torque output

🔩 Gearbox Design Types

• Bevel Gears: Gears intersect at a right angle
• Spur Gears: Gears rotate parallel to each other

3D View of Speed Gearbox Mechanism

🧰 Project Overview: 3-Speed Gearbox

This mechanical model demonstrates how gear ratios and arrangements affect motion transfer. The system includes multiple gear groups and a motor-driven central shaft, enabling dynamic rotational transfer using different pathways.

🧱 Materials Used

• MDF (Medium-Density Fiberboard)
• Mild Steel
• Acrylic Sheets

🔄 Gear Group Breakdown

The system is organized into 4 gear groups, each containing 4 gears of different sizes. It operates under three different scenarios based on coupling and gear engagement.

⚙️ Scenario 1

• Coupler is engaged
• Motor → Group 1 → Coupler → Group 3
• Groups 2 & 4 are disengaged

⚙️ Scenario 2

• Coupler and Group 4 are disengaged
• Motor → Group 1 → Group 2 → Group 3

⚙️ Scenario 3

• Coupler and Group 2 are disengaged
• Motor → Group 1 → Group 4 → Group 3

🔁 Gear Interaction Logic

The system relies on effective meshing between the largest gears in Groups 1 & 3 and the smallest gears in Groups 2 & 4. This design ensures reliable rotational transfer across different scenarios.

📁 Project Files

• Drawings/gearbox_structure.dwg — CAD model and parts layout
• Simulation/gearbox_mechanism.mp4 — Working video of all three scenarios
• Docs/gearbox_mechanism_notes.pdf — Detailed explanation and working logic

Academic Project — Developed at FAST University Islamabad. Don’t forget to ⭐ the repo if you like it 💖