In any application where a chain drive is going to be used, sprockets will be required in order for the chain to transmit the power.
A sprocket is a profiled wheel with teeth that mesh with a chain, track or other perforated or indented material. The name ‘sprocket’ applies generally to any wheel upon which are radial projections that engage a chain passing over it. It is distinguished from a gear in that sprockets are never meshed together directly, and differs from a pulley in that sprockets have teeth and pulleys are smooth.
They are used in cars, tracked vehicles, bicycles, motorcycles and other machinery either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track, tape etc. Perhaps the commonest form of sprocket is found in the bicycle, in which the pedal shaft carries a large sprocket-wheel which drives a chain which in turn drives a small sprocket on the axle of the rear wheel. Early automobiles were also largely driven by sprocket and chain mechanism, a practice largely copied from bicycles.
Some sprockets used with timing belts have flanges. This keeps the timing belt centered. Sprockets and chains are also used for power transmission from one shaft to another where slippage is not admissible, chains being used instead of belts or ropes and sprocket instead of pulleys. They can be run at high speed and some forms of chain are so constructed as to be noiseless even at high speed.
At Townsend Bearings we can supply a full range to suit all standard tooth pitches. We can supply them in steel and, for larger sprockets, cast iron as well as stainless steel for clean environments such as a food processing plant. They can be supplied either pilot bored, or to fitted with a taperlock bush. They can also be supplied as plate-wheels where no hub is needed, or allowing you to use your own weld-on hub in order to fit a taperlock bush that is smaller or larger than is usual for that particular size sprocket.
We can also offer sprockets for duplex and triplex chain, as well as double simplex, in case of two separate chains running off of the same sprocket.
As well as the common roller-chain sprocket, we can also offer the more specialised conveyor sprockets, specifically designed to work with conveyor systems. These often have larger tooth pitches, and are available in additional materials such as polyurethane or nylon for use in food and other clean environments.
All of our catalogues are available to download in PDF format. To view our catalogues see links to the full Sprockets and Platewheels catalogue and all the separate sections listed below.
Sprockets Catalogue Sections
Sprockets – Pilot Bore Sprockets British Standard
Sprockets – Taper Lock Sprockets British Standard
Sprockets – Cast Iron Pilot Bore Sprockets British Standard
Sprockets – Platewheels British Standard