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A layshaft is an intermediate shaft within a gearbox that carries gears, but does not transfer the primary drive of the gearbox either in or out of the gearbox. Layshafts are best known through their use in car gearboxes, where they were a ubiquitous part of the rear-wheel drive layout. With the shift to front-wheel drive, the use of layshafts is now rarer. The '' 'driving shaft' '' carries the input power into the gearbox. The '' 'driven shaft' '' is the output shaft from the gearbox. In car gearboxes with layshafts, these two shafts emerge from opposite ends of the gearbox, which is convenient for RWD cars but may be a disadvantage for other layouts.〔 For gearboxes in general, gear clusters mounted on a layshaft may either turn freely on a fixed shaft, or may be part of a shaft that then rotates in bearings. There may be multiple separate clusters on a shared shaft and these are allowed to turn freely relative to each other. == Origins == The term 'layshaft' originates with watermill machinery. The layshaft is the gear-carrying shaft that links the 'wallower' (the small spur gear driven at increased speed by the waterwheel) to the 'upright shaft(s)' that carry the millstones. The term layshaft was also used by millwrights, in both wind- and watermills, to refer to a shaft that drove secondary machinery such as sack hoists, rather than the main milling machinery. The term 'layshaft' was also applied to back-geared lathes. These were lathes with a slow-speed mechanism in addition to their usual belt drive. This used two gears on a layshaft behind the headstock, giving a double reduction gear. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Layshaft」の詳細全文を読む スポンサード リンク
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