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New torsionally soft coupling from Centa.

Centa has announced the availability of its new high thermal capacity Centamax-HTC torsional coupling, which is suited for engine-driven systems that require a torsionally soft, linear characteristic coupling with high power loss capacity, the company said.


The principle of the Centamax coupling was developed and introduced by the company more than 25 years ago. The basic design consists of a rubber disc, vulcanized to a center hub on its inner driven part and plugged in by teeth axially to the driving flange.

Today's diesel engines, however, trend toward higher power density and improved gas exhaust values. Because of this, engines become torsionally more active--placing higher requirements on the coupling, Centa said. Thus, the demand for higher permissible power loss of the coupling is constantly rising in order to better dissipate the internal heat caused by damping within the coupling.

The mixture of natural rubber typically used for these types of couplings has already been optimized for highers temperature stability. Silicone has also been used as an alternative but is expensive and can result in a slightly progressive torsional characteristic curve with lower strengths and low resistance to tearing, according to Centa.

The Centamax-HTC design changes target increasing the permissible power loss of couplings made of natural rubber, particularly for large couplings for diesel-driven generator sets. The rubber discs of the new HTC coupling are divided into two slim halves. This design reduces internal temperature of the coupling, increases lifetime and in many cases permits the use of a smaller coupling or avoids the necessity for an expensive, complex and space-demanding, double-element coupling, Centa said.

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Publication:Diesel Progress North American Edition
Date:Nov 1, 2009
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