Tensioner
![](/w/images/thumb/c/c4/Kettenspanner_f%C3%BCr_Singlespeed-R%C3%A4der.jpg/300px-Kettenspanner_f%C3%BCr_Singlespeed-R%C3%A4der.jpg)
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 spring-loaded bicycle chain tensioner, the tension it creates. The force may be generated by a fixed displacement, as in the case of an eccentric bicycle bottom bracket, which must be adjusted as parts wear, or by stretching or compressing a spring, as in the case of a spring-loaded bicycle chain tensioner; by changing the volume of a gas, as in the case of a marine riser tensioner; by hydraulic pressure, as in the case of a hydraulic bolt tensioner; or by gravity acting on a suspended mass, as in the case of a chair lift cable tensioner.
Applications
- Bolt tensioners are devices designed to apply a specific tension to a bolt. The device may be either removed once the actual nut is threaded into place, or left in place, in the case of a hydraulic nut.[1]
- The belt or chain tension on a single-speed bicycle can be maintained by either setting the fixed horizontal position of the rear sprocket or the front chainring horizontally, or by a separate tensioner that pushes perpendicular to the chain with either a fixed position or spring tension.[2]
- 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.[3]
- A marine riser tensioner is a device used on an offshore drilling vessel which provides a near constant upward force on the drilling riser independent of the movement of the floating drill vessel.
- A guideline tensioner is a hydropneumatic device used on an offshore drilling rig that keeps a positive pulling force on the guidelines from the platform to a template on the seabed.
- Overhead electrical wires may be kept in tension by springs or weights.
- Chair lift and gondola lift cables
- Fencing made of wire, such as electric fences, barbed-wire fences, and chainlink fences often include tensioning devices to keep them taut.
- Belt sanders have a mechanism, often a spring-loaded idler drum, to apply the proper tension to the sanding belt, which can be released to allow for changing belts.[7]
Gallery
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Overhead line tensioner 012.JPG
Spring-loaded overhead line tensioner
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Overhead line tensioner 003.JPG
Gravity overhead line tensioner
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Nockenwellenantrieb.jpg
Chain tensioner in an automobile engine
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Tendeur courroie alternateur automobile.jpg
Adjustable, fixed-position belt tensioner in an automobile engine
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Seamus O Kane Band Tensioner System Bodhran.JPG
Drum tensioner
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Conveyor belt tensioner - geograph.org.uk - 1485359.jpg
Conveyor belt tensioner
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Bullwheel and counterweight in tENSION TERMINAL, LOOKING southeast. - Mad River Glen, Single Chair Ski Lift, 62 Mad River Glen Resort Road, Fayston, Washington County, VT HAER VT-38-42.tif
Chair lift cable tensioner
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OldFramesaw-cut-out.png
Traditional Finnish frame saw with wooden frame, loggers' tool before cross-cut and chain saws till 1960s
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Riser Tensioner.jpg
Marine riser tensioner
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Beam Tensioner Truss.jpg
Beam tensioner truss
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Cric-tenseur.jpg
Chainlink fence tensioner
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Track Tensioner on a Churchill Tank.jpg
Track tensioner on a Churchill Tank
See also
References
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