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For example, a 40" pulley at 100 rpm would turn a 20" pulley at 200 rpm. Pulleys solidly attached ("fast") to the shaft could be combined with adjacent pulleys that turned freely ("loose") on the shaft (idlers). In this configuration the belt could be maneuvered onto the idler to stop power transmission or onto the solid pulley to convey the power.
The entire belt may be tensioned by a single idler pulley. The nomenclature used for belt sizes varies by region and trade. An automotive belt with the number "740K6" or "6K740" indicates a belt 74 inches (190 cm) in length, 6 ribs wide, with a rib pitch of 9 ⁄ 64 of an inch (3.6 mm) (a standard thickness for a K series automotive belt would ...
An idler gear is a gear wheel that is inserted between two or more other gear wheels. The purpose of an idler gear can be two-fold. Firstly, the idler gear will change the direction of rotation of the output shaft. Secondly, an idler gear can assist to reduce the size of the input/output gears whilst maintaining the spacing of the shafts.
A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain. The earliest evidence of pulleys dates back to Ancient Egypt in the Twelfth Dynasty (1991–1802 BC) [1] and Mesopotamia in the early 2nd millennium BC. [2]
Aside from the belt/chain itself, also common is a failure of the tensioner, and/or the various gear and idler bearings, causing the belt/chain to derail. Furthermore, in engines where the timing belt drives the water pump, failure of the water pump can cause the pump to seize, which can break the timing belt or chain.
ISO 3410:1989 Agricultural machinery — Endless variable-speed V-belts and groove sections of corresponding pulleys; ISO 3411:2007 Earth-moving machinery — Physical dimensions of operators and minimum operator space envelope; ISO 3412:1992 Road vehicles — Screened and waterproof spark-plugs and their connections — Types 1A and 1B
ISO 99:1975 Pulleys for flat transmission belts — Diameters [Withdrawn: replaced with ISO 22] ISO 100:1984 Pulleys for flat transmission belts — Crowns [Withdrawn: replaced with ISO 22] ISO/R 101:1959 Width of sheets of paper [Withdrawn without replacement] ISO 102:1990 Aircraft — Gravity filling orifices
Variable-pitch drives are pulley and belt drives in which the pitch diameter of one or both pulleys can be adjusted. Traction drives transmit power through metal rollers running against mating metal rollers. The input-output speed ratio is adjusted by moving the rollers to change the diameters of the contact path.
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