Clamp Couplings

A clamp coupling, also known as a split-muff or compression coupling, is a type of rigid shaft coupling used to connect two shafts securely together end-to-end. Unlike a single-piece sleeve coupling, a clamp coupling is typically made in two halves which are bolted together around the shafts, providing a high-friction connection.

🛠️ Structure and Design
The defining feature of the clamp coupling is its split design, which allows for easier installation and removal without requiring the connected machinery or shafts to be moved axially.
• Halves (Shells): The coupling consists of two semi-cylindrical parts, usually made of cast iron or steel, machined to fit the diameter of the shafts.
• Clamping Bolts: These two halves are placed over the ends of the shafts and are fastened tightly together using several mild steel studs or bolts and nuts.
• Keyways (Optional): While the clamping action provides significant holding power through friction, keyways and keys are often used in conjunction to ensure a positive, slip-free drive, especially for heavy power transmission applications.
⚙️ Function and Operation
Clamp couplings create a secure, rigid connection that functions as if the two connected shafts were a single, solid piece.
• Torque Transmission: Power is primarily transmitted by the strong clamping force, which creates high friction between the inner surface of the coupling and the outer surface of the shafts. The use of a key enhances this transmission capacity.
• Rigidity: As a rigid coupling, it maintains precise alignment (coaxiality) between the shafts and does not accommodate for misalignment, shock, or vibration. Precise initial alignment is essential to avoid excessive stress on bearings and other components.
• Ease of Maintenance: The primary advantage over a solid sleeve coupling is the ability to assemble or disassemble the coupling without disturbing the position of the connected equipment (e.g., pumps, motors, gearboxes).
💡 Applications
Clamp couplings are commonly used in various industrial settings, particularly where moderate to heavy loads and moderate speeds are involved:
• General machinery and manufacturing lines.
• Conveyor systems.
• Marine propulsion systems, where ease of installation in confined spaces is beneficial.
• Vertical pumps, due to their ability to handle significant thrust loads.