Flexible Shaft Couplings

Flexible couplings are used to connect two shafts while accommodating misalignment, vibration, or axial movement. ✅ Key Specifications for Flexible Shaft Couplings 1. Torque Rating Definition: Maximum torque the coupling can transmit without failure. Units: N·m (Newton-meters), lb·in, or lb·ft. Selection Tip: Choose a coupling with a torque rating at least 1.5–2 times the operating torque for safety. 2. Shaft Size (Bore Diameter) Definition: Diameter of the shafts to be connected. Units: mm or inches. Types: Standard bore (straight) Keyed bore Clamp or set screw type 3. Misalignment Compensation Types: Angular Misalignment (degrees) Parallel (Radial) Misalignment (mm or in) Axial Movement (mm or in) Why It Matters: Protects bearings and reduces vibration. 4. Torsional Stiffness Definition: Resistance to twist under torque. Impact: High stiffness = better accuracy, Low stiffness = better shock absorption. Unit: N·m/rad 5. Backlash Definition: Free play or lost motion between mating components. Zero-backlash couplings are used in precision applications (e.g., CNC machines). 6. Operating Speed (RPM) Maximum RPM the coupling can safely operate at. Balanced designs are critical for high-speed applications. 7. Material Common materials: Aluminum – lightweight, low inertia Steel – durable, higher strength Stainless Steel – corrosion resistant Plastic or Composite – for low torque, low inertia needs 8. Environmental Factors Temperature range Chemical or moisture exposure Outdoor vs Indoor use 9. Mounting Type Clamp Set screw Keyed Split hub 10. Coupling Type Oldham Bellows Jaw (Spider) Disc Beam Grid Chain Gear Each type suits different applications (e.g., jaw couplings are good for vibration damping, disc couplings are good for high precision and torque). 📌 Example Specification Format: PropertySpecification Torque Capacity 50 N·m Shaft Diameter Range 10–25 mm Max Misalignment Angular: 1°, Parallel: 0.2 mm Max RPM 6000 rpm Material Aluminum Operating Temperature -20°C to 80°C Backlash Zero Mounting Type Clamp style