| Size | TYPE F & H | TYPE B | A | C | ‡ G |
† M |
No. of screws per flange |
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bush No. |
Max Bore |
L | D | E | F | ξ J |
Approx Weight Kg * |
Max Bore |
Min Bore |
L | D | E | F | Set Screw on key |
Approx Weight Kg * |
||||||
| F45 | 1108 | 28 | 67 | - | 22 | 33.5 | 29 | 3.0 | 32 | 11.00 | 73 | - | 25 | 36.5 | M5 | 2.2 | 120.0 | 94 | 43 | 23 | 4 |
The F45 Tyre Coupling is a highly versatile, "torsionally soft" flexible coupling designed to protect drive systems from shock loads and misalignment. Renowned for its simplicity and durability, the F45 size is a popular choice for light-to-medium duty industrial applications, offering a lubrication-free solution that significantly reduces maintenance downtime.
Coupling Type: Highly Flexible Tyre Coupling
Bore Range: 10 mm to 32 mm
Taper Lock Bush Size: 1108
Nominal Torque: 110 Nm
Max Speed: 4,500 RPM
Angular Misalignment: Up to 4°
Parallel Misalignment: Up to 1.1 mm
End Float (Axial): Up to 1.3 mm
Standard Material: Cast Iron Flanges with Natural Rubber or FRAS (Fire Resistant Anti-Static) Tyre element.
The F45 coupling transmits torque through a flexible rubber element (the tyre) positioned between two metal hubs. As the motor rotates, the torque is transferred through the tyre to the driven shaft.
Because the connection is made through rubber rather than metal-on-metal contact, the coupling acts as a buffer. When the machine experiences a sudden start-up or a "shock" load, the tyre twists and flexes, absorbing the energy before it can damage the motor shaft or gearbox.
Zero Lubrication Required: unlike gear or grid couplings, the F45 uses elastomeric technology. It requires no grease, eliminating contamination risks and reducing maintenance time.
Easy "Replace-in-Place" Maintenance: The split-tyre design allows for easy inspection and replacement without moving the motor or the driven machine. Simply unclamp the tyre and fit a new one.
Superior Misalignment Handling: The F45 excels at handling parallel, angular, and axial misalignment simultaneously, which prevents premature bearing failure.
Vibration & Noise Damping: The rubber element isolates torsional vibrations, resulting in quieter operation and longer equipment life.
The F45 size is versatile and widely used across various industrial sectors:
Fluid Handling: Centrifugal pumps and vacuum pumps.
HVAC: Industrial fans and blowers.
Material Handling: Belt conveyors and screw conveyors.
Processing: Mixers, agitators, and light compressors.
General Industry: Generator sets and packaging machinery.
Selection Guide: To ensure the F45 is the correct size, you must determine the Design Power of your application.
Formula: Design Power = Motor Power x Service Factor
Always apply a Service Factor based on the load type (e.g., use 1.0 for steady fans, but 1.5 or higher for crushers or reciprocating pumps).
Installation Best Practices:
Gap Setting: Ensure the distance between the flange faces (dimension 'M') is set correctly to allow the tyre to function without over-stretching.
Torque Settings: When tightening the clamping screws, use a torque wrench to meet the manufacturer's specifications. Over-tightening can damage the tyre bead.
Alignment: Although the F45 handles misalignment well, aligning the shafts as precisely as possible during installation will significantly extend the lifespan of the rubber tyre.
The F45 Tyre Coupling combines simplicity with high performance. By isolating shock loads and accommodating shaft misalignment, it acts as a critical "fuse" in your mechanical system. For facility managers seeking a low-maintenance, reliable, and lubrication-free coupling solution, the F45 is the industry standard.
