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Power Transmission


Following the development of high-performance belt drives for the automotive industry, dragsters, motorcycles (including Harley Davidson), snowmobiles and thousands of other industrial applications, Gates has now developed a rubber-carbon belt, the Carbon Drive CDN belt, for a fold-up city bicycle in cooperation with the designers’ engineering team. The bicycle, which included the cutting-edge carbon belt system, won an award for its innovative folding kinematics. The rubber carbon belt system targets the mid-level


priced bicycle market, building on the platform created by the high performance polyurethane Gates Carbon Drive belt already well established amongst mountain bike fans. Carbon fibre was the enabling technology, resulting in a belt with the highest modulus and strength. Unlike chain, carbon fibre is length-stable and will not stretch. The 11mm pitch belt profile is designed specifically


for optimal belt drive bicycle performance and to meet the demands of human power. The rubber carbon belt provides the smooth ride cyclists want, without some of the downsides of the traditional bike chain. It is quieter and requires less maintenance, and is also grease and oil free.


When talking about material developments,


polyurethane timing belts should not be forgotten. They also offer long-lasting and energy-efficient solutions for


different applications. Gates produces linear, wide and endless flexible timing belts, which can all be modified with various coatings, profiles and special machining operations. In order to achieve variations in the coefficient of friction, abrasion resistance or belt thickness, various materials such as polyurethane, elastomer, foam, PVC and special coatings may be applied. The addition of profile shapes makes these belts


perfect for packaging machines, transport applications and other automation equipment. The cast profiles, like the timing belts, are made of heavy-duty polyurethane. By welding the profile to the belt, a homogeneous connection is created between it and the belt. The profiles can be made in almost any design. Gates’ wide belts are used in applications where the


precise positioning of the product must be guaranteed. Thanks to their easy cleaning and the positive positioning characteristics, these belts are used in the food, hygiene, tyre and confectionary industries, in which belt slip must be avoided. GMT3 is the latest addition to the ‘Wide Timing Belts’ product line. The special GMT3 tooth profile was designed as an alternative to existing flat belts. ●


For more information ✔ at www.engineerlive.com/ede


David Clark is a Gates Senior Engineer & Technical Expert, Dumfries, Scotland. www.gates.com/europe


Fig. 2. PowerGrip GTX high- performance synchronous belt offer increased strength and lower strain, low-noise operation and an extremely high resistance against shock load.


36 www.engineerlive.com


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