Tyre Couplings F70 - 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
F70	1610	42	92	76.0	25	50.5	38	7.4	55	19.05	132	82	45	50.5	M6	8.0	197.0	144	10	42	5

The F70 Tyre Coupling is a heavy-duty flexible coupling designed for demanding industrial environments. Stepping up from the F60, the F70 offers a substantial increase in torque capacity—capable of transmitting over 200 Nm nominally—while retaining the F-Series' signature ability to absorb shock loads and accommodate significant shaft misalignment.

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Key Specifications

The F70 is engineered for higher power transmission in compact spaces. Below are the standard technical specifications:

Parameter	Value
Model Size	F70
Nominal Torque	203 Nm
Max. Torque (Peak)	487 Nm
Max. Rotational Speed	3,600 RPM
Power Rating (at 1440 RPM)	~30 kW (approx)
Taper Lock Bush Size	1610
Max. Bore Size	42 mm (with 1610 Bush) / 50 mm (Max with B Flange)
Misalignment Capability	4° Angular \| 1.9mm Parallel \| 2.3mm End Float

How It Works

The F70 functions using a highly elastic tyre element that bridges two metal flanges.

Torque Transfer: Power flows from the driving shaft into the first flange, through the reinforced rubber tyre, and into the driven flange. This path cushions the drive against mechanical spikes.
Vibration Damping: The rubber compound inherently absorbs torsional vibrations, which is critical for smooth operation in reciprocating machinery like piston pumps or compressors.
Accommodating Movement: The F70 excels at handling "end float" (axial movement) and parallel misalignment, often caused by thermal expansion or foundation settling.

Benefits of F70 Couplings

High Shock Absorption: The F70 is torsionally soft, cushioning against destructive shock loads and reducing the risk of shaft failure.
Low Maintenance: Requires no lubrication. Visual inspections of the tyre condition can be done without stopping the machine (if safe guards allow).
Easy Replacement: The tyre is split, allowing for replacement without moving the motor or driven machine—a major time-saver during shutdowns.
Safety: Non-conductive rubber elements (standard natural rubber) electrically isolate the two shafts, preventing stray currents from damaging bearings.
Versatility: Suitable for reversing drives and high-start-frequency applications due to its durable construction.

Typical Applications

The F70 is a popular choice for medium-to-heavy duty machinery across various sectors:

Mining & Quarrying: Crushers, screens, and ball mills where shock loads are constant.
Fluid Power: Large piston pumps and heavy-duty compressors.
Material Handling: Screw conveyors and bucket elevators.
Paper & Pulp: Rolling mills and winders requiring smooth torque delivery.
Metal Processing: Rolling mill auxiliary drives.

Summary

The F70 Tyre Coupling is a robust solution for engineers needing reliable power transmission up to 30 kW (at 1440 RPM). With a peak torque capacity of 487 Nm and generous misalignment tolerances (up to 1.9mm parallel), it ensures operational continuity and protects expensive plant assets from the wear and tear of vibration and shock loading.