\u4f20\u52a8<\/a><\/span><\/p>\nThe 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.<\/span><\/p>\n\n
Number of teeth<\/span><\/strong><\/p>\nThe 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.<\/span><\/p>\nThe 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.<\/span><\/p>\nCentre Distance<\/span><\/strong><\/p>\nFor 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.<\/span><\/p>\nThe 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.\u00a0<\/span><\/p>\nThe 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.<\/span><\/p>\nFor 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.<\/span><\/p>\n\n
\n\n\n| \n Sprockets<\/span><\/strong><\/p>\n<\/td>\n| \n run<\/strong>Smooth<\/strong><\/span><\/p>\n<\/td>\n| \n MODERATE SHOCKS<\/span><\/strong><\/p>\n<\/td>\n| \n acuteness<\/span><\/strong>
\nshake<\/span><\/strong><\/p>\n<\/td>\n<\/tr>\n\n| \n Up to 29T<\/span><\/strong><\/p>\n<\/td>\n| \n EN8<\/span>
\nor<\/span>
\nEN9<\/span><\/p>\n<\/td>\n | \n EN8 or EN9 quenching and tempering or case hardening<\/span>
\nmild steel<\/span><\/p>\n<\/td>\n | \n EN8 \u6216 EN9<\/span>
\nQuenched and tempered or case-hardened mild steel<\/span><\/p>\n<\/td>\n<\/tr>\n\n| \n 30T AND OVER<\/span><\/strong><\/p>\n<\/td>\n| \n Cast Iron<\/span><\/p>\n<\/td>\n | \n Mild steel or Meehanna steel<\/span><\/p>\n<\/td>\n | \n EN8 \u6216 EN9<\/span>
\nQuenched and tempered or case-hardened mild steel<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n | | | | | | | |
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