Flexible Tyre Coupling

This flexible tyre coupling consists of two cast iron flanges and a rubber tyre with studs or ribs that engage with recesses on the flanges. When torque is transmitted, the tyre deforms in shear, which provides high flexibility and excellent shock absorption. The rubber tyre can accommodate significant angular and parallel misalignment without placing stress on the connected equipment. Under normal operating conditions, the tyre also dampens torsional vibrations and reduces noise. We have supplied these couplings for rock crushers and ball mills where misalignment is difficult to control.

The torque range runs from 100 Nm up to 30,000 Nm, depending on the tyre size and compound. Bore sizes are available from 20 mm to 150 mm. Maximum speed is 3000 rpm. Angular misalignment capacity is up to 4 degrees, parallel misalignment up to 3 mm, and axial misalignment up to 5 mm. The operating temperature range for standard rubber is from -30°C to +80°C.

Compared to other flexible tyre coupling, the rubber tyre can handle much larger misalignment, which simplifies installation and allows for thermal expansion of shafts. The coupling requires no lubrication because the tyre is dry running. The tyre acts as a sacrificial element: it will fail before damaging the flanges or connected machines, thereby protecting expensive equipment. Replacement is straightforward; you simply slide off the old tyre and push on a new one without moving the hubs. Under normal conditions, tyre life ranges from one to three years, depending on operating temperature and torque peaks.

We machine the flanges from ductile iron or steel and coat them with anti-rust paint. The rubber tyres are compression moulded with textile reinforcement for high tear resistance. Lead time for standard flange bores is 20 to 30 working days. Common sizes are kept in stock. We can ship by sea or air freight, depending on your destination.

We can customise bore sizes and keyways to your drawing. For oily environments, we offer tyres made of oil-resistant nitrile rubber (NBR). Tyre hardness can be adjusted (Shore 75A to 90A) for different damping requirements. Stainless steel flanges are available for corrosive conditions.

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