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  • Belt-driven bicycle

    serch.it?q=Belt-driven-bicycle

    Belt-drive single-speed rear hub on a Trek District Trek District internal-geared multi-speed rear hub on a Trek Soho A belt-driven bicycle is a chainless bicycle that uses a toothed synchronous belt to transmit power from the pedals to the wheel. The belts are typically made by the same manufacturing companies that produce timing belts for automobiles, machinery, and other synchronous belt-drive applications. The application of belt drives to bicycles is growing, especially in the commuter bicycle market, due to the low maintenance and lubrication-free benefits. Belt drives are also available for stationary and fitness bicycles.

  • Drum motor

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    A drum motor (or motorised pulley) is a geared motor drive enclosed within a steel shell providing a single component driving pulley for conveyor belts. right right The drum motor concept was first recorded in 1928 but was not realised until the early 1950s when it was first produced specifically for conveyor belt applications. The idea was to produce a compact, totally enclosed single component drive unit with high efficiency and lower frictional losses than a conventional geared motor. The new design was quick and easy to install, required no maintenance and because of its totally enclosed IP66 sealed design would be unaffected by dust, dirt grease or water. Today you see many examples of drum motor applications in airport check-in conveyors and security machines, supermarket checkstands, food processing conveyors and weighing equipment. Reversible drum motors are also used for roller shutter doors.

  • Timing belt (camshaft)

    serch.it?q=Timing-belt-(camshaft)

    Timing belt A timing belt, timing chain, or cambelt is a part of an internal combustion engine that synchronizes the rotation of the crankshaft and the camshaft(s) so that the engine's valves open and close at the proper times during each cylinder's intake and exhaust strokes. In an interference engine the timing belt or chain is also critical to preventing the piston from striking the valves. A timing belt is usually a toothed belt—a drive belt with teeth on the inside surface. A timing chain is a roller chain. Cosworth BDR engine, with timing belt and pulleys Many modern production automobile engines use a timing belt to synchronize crankshaft and camshaft rotation; some engines, particularly cam in block designs, used gears to drive the camshaft, but this was rare for OHC designs. The use of a timing belt or chain instead of gear drive enables engine designers to place the camshaft(s) further from the crankshaft, and in engines with multiple camshafts a timing belt or chain also enables the camshafts to be placed further from each other.

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