Sprockets and Gears
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 radial projections 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.
Standard Sprockets Include:
- Type A have no hub
- Type B have a hub on one side
- Type C have hubs on both sides
- QD Sprockets have tapered bushings
- Idler Sprockets are used to prevent chain whip in long chain applications
Roller Chain Sprockets are used in bicycles, motorcycles, cars, tracked vehicles, and other machinery either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion. Perhaps the most common form of sprocket may be found in the bicycle, in which the pedal shaft carries a large sprocket-wheel, which drives a roller chain, which then 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.
Custom Sprockets can have various designs. Sprockets typically do not have a flange. Some sprockets used with timing belts have flanges to keep the timing belt centered. Industrial Sprockets and chains are also used for power transmission from one shaft to another where slippage is not admissible, sprocket chains being used instead of belts or ropes and sprocket-wheels 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.
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