Sprocket Hardening - PDF document

Sprocket Hardening All U.S. Tsubaki sprockets are made from high quality steel. Since chain loadings are evenly distributed over all engaged sprocket teeth, tooth breakage or distortion is not normally a problem. It is seldom necessary to use special high strength material.Sprocket diameter and pitch determine the specific material used.The hardening process of small diameter, small pitch sprockets is usually a one-step procedure: heat treatment (electrical induction). Large diameter, large pitch sprockets can usually be directly flame hardened. These methods are used to provide a high hardness at the wear areas, plus provide the ability of the tooth to absorb shock loads. This is accomplished by hardening only the wear area of each tooth while maintaining a ductile tooth core which is tough and resilient. The hubs and bores remain soft to permit reworking.The general guidelines for sprockets are: SizeRockwellScales Hardness Conversion Table Rockwell ªCº150 KG. Load60 KG.Model C3000 KG. LoadBrinell No.Tensile Str.Lbs. per Sq. In. 101113141516171820212223242526282930313233343536373840414244454647495052535557586062646668702728282930303131323334353637373839404243444546484951525455575961636567707275788184879195 91,000 93,000 95,000 97,000 99,000 101,000 104,000 107,000 110,000 113,000 116,000 119,000 122,000 125,000 128,000 131,000 134,000 138,000 142,000 146,000 150,000 155,000 160,000 165,000 170,000 176,000 182,000 189,000 196,000 204,000 212,000 220,000 229,000 238,000 247,000 256,000 266,000 276,000 287,000 298,000 311,000 324,000 337,000 352,000 368,000 384,000Small pitch, small diameterLarge pitch, large diameterA C68-76 35-5063-70 25-40 Thru Hardened TeethCase hardened on wear surfaces with atough, resilient core. C - SPROCKETS C-76 Sprocket Tooth Dimensions Dimensions are in inches unless otherwise indicated. STANDARD SERIES CHAIN SPROCKETSHEAVY SERIES CHAIN SPROCKETS Chain Data for All SprocketsFor 4 or more StrandsDouble and TripleANSI &on ªtºand ªMºon THRHR 253540506080.130.200.312.400.469.625.750.8751.0001.1251.4061.5621.875.469.625.750.8751.0001.1251.4061.562.459.575.692.924.9241.1561.3011.389.444.557.669.894.8941.1191.2591.3441.4721.8402.2082.8182.9493.5553.9824.4272.5003.1233.7474.7425.0045.9916.7057.510.418.526.633.848.8481.0631.1971.2781.4461.8092.1722.7722.9033.4993.9204.3612.4743.0923.7114.6964.9585.9356.6437.4443.5024.3755.2506.6207.0138.3719.36610.5274.5305.5686.7898.5449.06810.80712.08913.6105.5586.9418.32810.46811.12313.24314.81216.6937.6149.50711.40614.31615.23318.11520.25822.8591.0281.2831.5391.9242.0552.4362.7233.083.110.168.284.343.459.575.692.924.9241.1561.3011.3891.738.107.162.275.332.444.557.669.894.8941.1191.2591.3441.682.359.561.8411.0451.3411.7102.0772.6832.8183.4243.8514.1615.140.611.9601.4071.7582.2382.8633.4854.4724.7425.7296.4436.9788.598.096.149.256.311.418.526.633.848.8481.0631.1971.2781.601.348.548.8221.0241.3151.6792.0412.6372.7723.3683.7894.0955.059.600.9471.3881.7372.2122.8323.4494.4264.6965.6736.3816.9128.517.8521.3461.9542.4503.1093.9854.8576.2156.6207.9788.9739.72911.9751.1401.7452.5203.1634.0065.1386.2658.0048.54410.28311.56512.54615.4331.3562.1443.0863.8764.9036.2917.6739.79310.46812.58814.15715.36318.8911.8602.9424.2185.3026.6978.59710.48913.37114.31617.19819.34120.997 Ð.252.399.566.713.8971.1531.4081.7891.9242.3052.5922.8173.458Ð.007Ð.008Ð.009Ð.010Ð.011Ð.012Ð.014Ð.016Ð.016Ð.019Ð.020Ð.021Ð.025Ð.011Ð.012Ð.014Ð.016Ð.016Ð.019Ð.020Ð.021Ð.036Ð.040Ð.046Ð.057Ð.057Ð.062Ð.068Ð.072Ð.021Ð.027Ð.035Ð.036Ð.036Ð.040Ð.046Ð.057Ð.057Ð.062Ð.068Ð.072Ð.087Sprocket Tooth Dimensions Ð Standard and Heavy Series U.S. TSUBAKI STOCK SPROCKETS C - SPROCKETS C-77 Sprocket Formulas &Standard Keyways Dimensions are in inches unless otherwise indicated.Dimensions are in inches unless otherwise indicated. 3540506080100120140160200 10111213141516171819202122232425101112131415161718192021222324256QE56O6QE6 (6 56QE\r56M\r6QE\r6 \r(6QE\r6M\r56QE56M6QE6M56QE56M6QE6M56QE56O6QE56O6QE56O6QE56O6QE56QE\r56QE6:O6EM56 56QE6QE6:O56M56 6QE6:O6 6QE56O56M6 6QE6M6 (6 (6QE\r56O\r56M6 \r56O6M\r6M(6 \r56O\r56M\rThe above maximum bores are not approved for severeservice conditions or for Cast Iron Sprockets.For severe service conditions maximum bores should not be greater than of the diameter of the hub.Maximum bores for Cast Iron Sprockets should be about 15% less than for steel with as the minimum difference.Standard Keyways and Set ScrewNOTE: As a general rule, the hub wall over the keyway should be equal to or greater than the diameter of the set screw.*Set screw size may vary depending on the hub wall thickness. DiameterKeyseatofDiameterKeyseatofof ShaftWidth x DepthSet Screwof ShaftWidth x DepthSet Screw SPROCKET DIAMETER FORMULASSuggested Maximum Hub Diameter = Cosine x P.D. ± (H + .050).P.D. = Pitch diameter N = Number of teeth. H = Height of inside plate. C - SPROCKETS C-78 Sprocket Pitch Diameter Dimensions are in inches unless otherwise indicated. To obtain the pitch diameter of a sprocket, multiply the constant for the number of teeth (as shown above) by the chain pitch. To determine the pitch diameter of a 28-tooth sprocket for 140 chain Ðuse a constant of 8.9315 and multiply by chain pitch (1C\v) to obtain apitch diameter of 15.63 Number ofNumber ofNumber ofTeethConstantTeethConstantTeethConstant 10111213141516171819202122232425262728293031323334353637383940414243444546474849505152 1.4142 1.7013 2.0000 2.3048 2.6131 2.9238 3.2361 3.5495 3.8637 4.1785 4.4940 4.8097 5.1259 5.4423 5.7588 6.0756 6.3925 6.7095 7.0266 7.3439 7.6613 7.9787 8.2962 8.6138 8.9315 9.2491 9.5668 9.8845 10.2023 10.5201 10.8380 11.1558 11.4737 11.7917 12.1096 12.4275 12.7455 13.0635 13.3815 13.6995 14.0175 14.3356 14.6536 14.9717 15.2898 15.6079 15.9260 16.2441 16.56195354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899 U.S. TSUBAKI STOCK SPROCKETS C - SPROCKETS C-79 Speed Ratios 1011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606870727680849596Speed Ratios for Sprocket Combinations Driver Sprocket Teeth91011121314151617181920212223242526 C - SPROCKETS C-80 Sprocket Diameters No. of No. of 1011121314151617181920212223242526283032353640454854607072 5.717 2.262 2.421 3.056 3.452 .880 4.58010111213141516171819202122232425262728303235364042454854607072808496 RS353¤8ºPitch No. of 10111213141516171819202122232425262728293031323334353638404244454647485054607072808496 5.742 Pitch No. of 101112131415161718192021222324252627282930313233343536373839404243444548495052545556607072808496 Pitch U.S. TSUBAKI STOCK SPROCKETS C - SPROCKETS C-81 Sprocket Diameters No. of 10111213141516171819202122232425262728293031323334353637383941424445464849505254607072808496 No. of 101112131415161718192021222324252627282930313233343536373842454648495460657072808496 RS80 1 Pitch Pitch No. of 10111213141516171819202122232425262728303235364245485460707280849096 RS100 1 Pitch C - SPROCKETS C-82 Sprocket Diameters No. of 101112131415161718192021222324252627283032353642454854607080 RS120 1 Pitch No. of 111213141516171819202122232425262830323536454854607080 RS140 1 Pitch No. of 1011121314151617181920212223242526272830353640454854607080 RS160 2 PitchNo. of 11121314151617181920212223242528303540455460 RS180 2 Pitch 7.986 9.010 6.499 8.693 9.750 7.287 9.402 10.480 7.927 10.111 11.210 8.705 10.822 11.940 9.357 11.533 12.660 10.127 12.245 13.390 10.787 12.957 14.110 11.551 13.670 14.830 12.217 14.383 15.560 12.977 15.096 16.280 13.648 15.810 17.000 14.404 16.524 17.720 15.079 17.238 18.440 15.832 17.952 19.160 16.511 20.096 21.320 18.690 21.525 22.760 20.119 25.101 26.350 23.669 28.677 29.940 27.271 32.255 33.530 30.829 38.695 39.980 37.290 42.992 44.280 41.586 No. of 101112131415161718192021222324252628303235455460 RS200 2 Pitch No. of 101112131415161718192021253035455460 30.340 RS240 3 Pitch U.S. TSUBAKI STOCK SPROCKETS C - SPROCKETS C-83 ¤ 8 F P b w i K r g 4 3 l W G d z m O u B a 2 . n e * x Ð N ª s º E L R t º V A C o D p 1 º 6 v c y & q 5 f Y - h T S 9 7 I 0 k U M H