Sprockets
Renold offers a complete range of industrial drive sprockets for British Standard chains with pitches up to 2 inches, ensuring maximum service life and productivity for your application. Other sprocket sizes, including those that meet U.S. standard sizes, are available upon request.
Special roller sprockets can also be manufactured in special materials or forms upon request, often to suit specific applications in harsh or difficult drive situations, such as:
- Sprockets with shafts
- Welded or detachable hubs
- A safety pin device is installed
- The necklace sprocket consists of a chain plate and individual tooth segments, which are used to turn a large drum or table.
- Combination sprockets (a combination of two or more sprockets with different pitch sizes and number of teeth).
- Sprockets with two or more segments, i.e., split sprockets or segmented sprockets.
Sprockets and chains are compatible with most drive drives传动
The chain pitch is even, and by using drive sprockets with odd teeth, wear is evenly distributed across the chain and sprocket teeth. Both drive sprockets and driven sprockets can use an even number of teeth, but the distribution of wear on the sprocket teeth and chain is poor.
Number of teeth
The maximum number of teeth in any driven sprocket should not exceed 114. This limitation is due to the fact that for a given case where the chain is elongated due to wear, the working pitch diameter of the chain on the sprocket is relative to the nominal pitch diameter, i.e. the chain is in a higher position on the sprocket teeth. Permissible safety chain wear is considered to be more than 2% elongation of the nominal length.
The simple formula used to determine the amount of chain elongation that a sprocket can accommodate is 200/N, expressed as a percentage, where N is the number of teeth on the largest sprocket in the drive system. When both the drive sprocket and the driven sprocket are operated by the same chain (e.g., on a 1:1 ratio drive), it is good practice to have a total number of teeth of at least 50. Both sprockets should have 25 teeth each.
Centre Distance
For optimal wear life, the center distance between the two sprockets should typically be within 30 to 50 times the chain pitch. For drive solutions with a center distance of less than 30 knots or more than 2 meters, we recommend discussing the drive details with our technicians.
The minimum center distance is sometimes determined by the number of chain turns on the drive sprocket, in which case we generally recommend no less than six teeth engaged with the chain.
The center distance also depends on whether a chain with an uneven pitch is needed to avoid the use of a crank linkage, which is not recommended except in exceptional circumstances.
For drives in the horizontal plane, the shortest possible center distance should be used consistent with the recommended number of chain turns (up to six teeth) on the drive sprocket.
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Sprockets |
runSmooth |
MODERATE SHOCKS |
acuteness |
|
Up to 29T |
EN8 |
EN8 or EN9 quenching and tempering or case hardening |
EN8 或 EN9 |
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30T AND OVER |
Cast Iron |
Mild steel or Meehanna steel |
EN8 或 EN9 |