Tyre Couplings F120 - Industrial Tyre Couplings

Size	TYPE F & H								TYPE B								A	C	‡ G	† M	No. of screws per flange
Size	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 *	A	C	‡ G	† M	No. of screws per flange
F120	3020	75	157	152.0	51	70.0	68	35.5	102	38.10	207	152	76	70.0	M12	41.0	314.0	264	14	55	6

The F120 Tyre Coupling is a heavy-duty, high-performance flexible coupling designed for the most demanding power transmission applications. Offering a substantial increase in torque capacity over the F110, the F120 is engineered to drive large industrial machinery where shock loads, vibration, and shaft misalignment are constant operational challenges.

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Key Specifications

The F120 is built for heavy engineering environments. Below are the standard technical specifications:

Parameter	Value
Model Size	F120
Nominal Torque	1,280 Nm
Max. Torque (Peak)	3,200 Nm (approx)
Max. Rotational Speed	1,800 RPM
Power Rating (at 1440 RPM)	~190 kW (approx)
Taper Lock Bush Size	3020
Max. Bore Size	75 mm (with 3020 Bush) / 102 mm (Max with B Flange)
Misalignment Capability	4° Angular \| 3.2mm Parallel \| 4.2mm End Float

How It Works

The F120 employs a "shear-type" design, utilizing a massive reinforced rubber tyre to transmit power between two metal flanges.

Torque Transmission: The driving flange rotates the flexible tyre, which transfers the torque to the driven flange. This elastic connection eliminates metal-to-metal wear and electrically isolates the shafts.
Shock Absorption: In heavy-duty applications like primary crushers, the F120 tyre twists to cushion the drivetrain against sudden load spikes, acting as a shock absorber that significantly extends component life.
Misalignment Handling: The F120 is capable of accommodating large parallel offsets (up to ~3.2mm) and axial movements, ensuring the drive system can withstand thermal expansion and structural settling without failure.

Benefits of F120 Couplings

High Power Capacity: Capable of transmitting ~190 kW at standard speeds, making it suitable for large-scale industrial drives.
"Replace-in-Place": The split-tyre element allows for rapid replacement without moving the heavy motor or driven machine, minimizing costly downtime during maintenance.
Lubrication Free: Requires no grease or oil, ensuring low-maintenance operation even in dirty, abrasive, or wash-down environments.
Vibration Damping: The natural rubber element effectively isolates torsional vibration, reducing noise and protecting sensitive downstream equipment.
Safety: In the event of extreme overload or jamming, the tyre will tear sacrificially, disconnecting the drive and saving the motor and gearbox from destruction.

Typical Applications

The F120 is the standard choice for heavy machinery in sectors such as mining, steel, and power generation:

Mining & Quarrying: Primary jaw crushers, large ball mills, and shaker screens.
Bulk Handling: Main drive conveyors for coal, iron ore, and grain terminals.
Fluid Power: Large multi-stage pumps and industrial blowers.
Metal Processing: Steel rolling mill drives and heavy shears.
Marine: Main propulsion drives and dredge pump connections.

Summary

The F120 Tyre Coupling is a critical component for heavy-duty power transmission. With a nominal torque rating of 1,280 Nm and the ability to absorb significant shock loads, it provides the ultimate protection for high-value industrial assets. Whether driving a crusher or a main conveyor, the F120 offers the durability, flexibility, and ease of maintenance required to keep heavy industry moving.