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Bridgestone Develops New 'Cooling Fin' Technology for Run-Flat Tyres

Bridgestone Develops New 'Cooling Fin' Technology for Run-Flat Tyres

Bridgestone has introduced new technology that expands the vehicle application potential of run-flat tyres.

"Cooling Fin" is a new model that uses disturbances in airflow created by protrusions on the tyre sidewall - that face in towards the centre of the wheel - to cool the outer surface of the rubber.

Heat generation is an issue when the tyre sidewall of a run-flat is placed under pressure following a loss of air pressure. It is even more apparent in tyres with a high sidewall, such as those for SUVs, which is why run-flats are largely limited to use with passenger cars.

The advancement in technology means lighter sidewall-reinforcing rubber can now be utilised - providing a greater scope for developing run-flats for larger passenger vehicles like SUVs, CUVs and minivans. The weight saving will also enhance comfort during normal driving conditions. Bridgestone has filed for patents on the "Cooling Fin" system and is exploring ways of extending the application of the technology to other tyres. The company plans to showcase its work at academic conferences in Japan before informing other technology markets around the world.

Run-flat tyres incorporating "Cooling Fin" technology will function in exactly the same way as standard run-flats, which enable motorists to drive a specified distance at a specified speed - up to 50 miles at 50mph - even after a loss of air pressure. Bridgestone already produces run-flat tyres for SUVs like the new BMW X5, the Dueler H/P Sport RFT, but the breakthrough will extend vehicle application potential in this growing automotive sector.