T-PUR® The new standard for spider elements

T-PUR The new heart of ROTEX® Introduction Torsionally flexible couplings have been well-approved machine components being used in various applications for a long time. Anyway, subject to the wide range of applications the demands on the couplings have continuously increased during the course of time. As a result the standard spider compounds often have to meet their limits so that expensive special compounds have to be used. That is why KTR has developed the new spider ma-terial T-PUR for the jaw couplings ROTEX® (illustration 1) which will become the future standard for KTR jaw couplings due to its wide range of applications. Text Since 1967 already the company KTR Kupplungstechnik GmbH based on a long tradition has offered jaw couplings type ROTEX® being the jaw couplings which are used most frequently for the lower and medium performance range throughout the world today. The couplings are char-acterized by small dimensions, low weight and low flywheel effects with high torque transmis-sion. The accurate, allover machining has a positive influence on the running characteristics and increases the service life of the coupling considerably. ROTEX® couplings ensure for a torsional vibration-damping power transmission in case of shocks in the drive train being produced by machines with non-uniform operation. Why has a new material been used? Often the environment which gearboxes, pumps, etc. are used in are not known beforehand. That is why the well-approved spider compounds meet their limits on several occasions. For that reason spiders made of PEEK or other special compounds have to be used under rugged ambient conditions more and more frequently. These are not only more expensive than standard ele-ments, but they are also disadvantageous with regard to damping, displacement, etc. That is why manufacturers of drive technology request for an all-round spider material for the “heart“ of the jaw coupling. KTR now offers their customers such kind of solution by T-PUR - at the same price which has been charged for standard materials up to now. The innovative spider material is particularly predestined for those drives being operated with variable speeds, reversing opera-tion or high ambient temperatures. Outstanding properties With the new material significant improvements compared to standard elastomers in particular with fatigue strength and temperature resistance were realized, while maintaining all positive technical features such as damping and resistance to wear. Thus, the new material can be used with temperatures from -50 °C to +120 °C. In contrast to that other standard spider materials only offer a temperature resistance from -30 °C to +90 °C. The increased service life allows to reduce the maintenance intervals and accordingly the expenses. The new material T-PUR is used as a standard spider in ROTEX® jaw couplings from size 14 to size 90 (illustration 2). From size 100 KTR supplies double tooth elements being made of the new material, too (illustration 3). That is why the double tooth elements can also be offered in 64 Sh now. Thus, the new material is available in different elasticities for all kinds of hardness from 92 Sh-A to 64 Sh-D. New products by extensive know-how only There is no light without shadow: That is why products being market leaders often run the risk of being copied. Anyway, for KTR this is an additional incentive to be always one step ahead of their competitors. A permanent further development of the product as well as customized solutions call for a strong research and development department. Out of the 850 employees within the KTR group of companies 60 engineers and technicians are in charge of the development of new products and customized solutions. The material was preceded by many years of cooperation between KTR’s experts and the experts of the nylon engineering industry. The results of this development were optimised over several months until the reque

For more information on T-PUR® The new standard for spider elements talk to KTR U.K. Ltd