Power Transmission
4 Power transmission systems often use belt drives of the V, multiple-V or synchronous type, and the technology is generally thought of as mature. Paul Stevens examines the incremental improvements being introduced.
4 Les systèmes de transmission de puissance utilisent souvent des courroies de transmission de type trapézoïdal, trapézoïdal multiple ou de synchronisation, et la technologie est en général considérée comme mature. Paul Stevens examine les améliorations incrémentielles introduites.
4 Kraftübertragungssysteme arbeiten oft mit Keilriemen, Mehrfachriemen oder Synchronriemen und es wird weithin angenommen, dass diese Technik ausgereift ist. Paul Stevens beschäftigt sich mit den schrittweisen Verbesserungen, die jetzt eingeführt werden.
Better belts for driving and timing
world. While the technology appears to be mature, that does not mean that there are no incremental improvements being made to enhance performance. Manufactures periodically launch new products or variants of existing products with higher power ratings, longer life expectancy, enhanced wear resistance and, more recently, improved efficiency to reduce the energy consumption of the machines on which they are installed. For example, in November 2011 the Contitech
V
Power Transmission Group launched two new V-belts specially designed for the extreme demands of agricultural engineering. Unveiled at the Agritechnica exhibition in Hanover, the Conti-V
-belts, multiple V-belts and synchronous (toothed) belts have been available for decades, with hundreds of products available from manufacturers around the
Multibelt high-performance composite V-belt is for use as a clutch belt in agricultural equipment (Fig. 1). Thanks to its low-friction surface, the high-performance multiple V-belt ensures gentle and silent clutching. Also launched at the same event, the high-performance Conti-V Varispeed wide V-belt has been developed for the types of variator and variomatic drives that are often used in agricultural implements. In order to transmit high power safely, the EPDM-based belt has a low-stretch aramid tensile member. The belt also benefits form being maintenance-free and remains stable in operating temperatures from -30 to 140°C. Earlier in 2011, at the IFPE (International
Fluid Power Exposition) in the USA, the Contitech Power Transmission Group exhibited an expanded range of heavy-duty Conti Synchrochain timing belts. These belts are now available in 55 different sizes are suitable for extremely tough operating
Fig. 1. Contitech’s Conti-V Multibelt high-performance composite V-belt is designed specifically for use as a clutch belt in agricultural equipment.
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