Tensioner
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A tensioner is a device that applies a force to create or maintain tension. The force may be applied parallel to, as in the case of a hydraulic bolt tensioner, or perpendicular to, as in the case of a
Chain tensioner on a single-speed bicycle
Belt tensioner on a belt-drive bicycle
Spring-loaded overhead line tensioner
Gravity overhead line tensioner
Idler-wheel
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An idler-wheel is a wheel which serves only to transmit rotation from one shaft to another, in applications where it is undesirable to connect them directly. For example, connecting a motor to the pla
Tensioner
…the chain with either a fixed position or spring tension. The serpentine belt and the timing belt or chain on an automobile engine may be guided by an idler pulley and/or a belt tensioner, which may be spring-loaded, hydraulic, or fixed. The chain tension of a chainsaw may be adjusted with a chain tensioner…
Three gears in a machine. The middle gear is an idler.