Coupling isolates torsional vibration in the main
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Centa Transmissions product story
Edited by the Engineeringtalk editorial team
Dec 7, 2004
Yorkshire-based power transmissions specialist Centa Transmissions has helped amphibious vehicle producer Covelink Marine to create the new Roylecraft Amphibious Jet Bus.
Yorkshire-based power transmissions specialist Centa Transmissions has helped amphibious vehicle producer Covelink Marine to create the new Roylecraft Amphibious Jet Bus.
Centa specialises in providing innovative solutions to all types of drive and transmission situations and were called in to solve an intrusive noise and vibration problem in the new 12 metre craft.
The Roylecraft Jet Bus is powered by a single diesel engine from which a number of drives are configured to power the main waterjet and the road wheels, as well as various smaller operations throughout the vehicle.
In order to achieve its target speeds of 100km/h on the road and a speedy 30 knots on water, the vibration and noise emanating from the transmission was a major problem and had to be removed.
Also, any solution had to address and overcome the complexities caused by the amphibious nature of the vehicle.
And as a passenger carrying vehicle, any transmission noise and vibration needed to be removed for passenger comfort and the elimination of wider environmental noise pollution.
Centa's innovative solution used the Centax CX-16VFA coupling with great success by isolating the torsional vibrations of the diesel engine from the driveline.
High torsional vibrations in the driveline will "ring" the thin wall-section of a cardan shaft and create "rumbling" noise in the gearboxes, which will generally reduce the life of the entire transmission.
The Centax-16VFA also supports the cardan shaft it protects, providing a dynamically stable drive line at an economical cost.
As in many marine drive situations, space was at a premium and Centa's design used a minimum length coupling and shaft solution to overcome this.
David Royle, Managing Director of Covelink, said: "The Jet Bus is an entirely new vehicle that does not use conventional bus or truck engineering, but was designed and built from scratch".
"It's only when all is put together that you find out exactly where the problems are".
"The result is that the Jet Bus is very quiet, lovely and smooth running and we are very pleased with Centa's solution to the noise problem".
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