Facts & Figures Book - KPI-JCI

SPEED RATIOSSpeed ratios and groups from which speed change selection can be made.Revolutions per minute of faster shaftRatio of transmission =Revolutions per minute of slower shaftNumber of Teeth in Driven Gear & SprocketGENERAL INFORMATION ON CHAINSThe chain drive has three elements; the driver sprocket, the drivensprocket, and the endless chain which transmits power form the firstto the second. The distance from center to center of adjacent chainpins is the chain pitch and also the sprocket pitch.No. of teeth in sprocket x chain pitch (in.) x r.p.m.Chain speed, f.p.m. =12H.P. of driveNumber of Teeth in Driver Gear & Sprocket17 19 21 23 25 27 30 3319 1.12 1.00 0.91 0.83 0.76 0.70 0.64 0.5821 1.23 1.10 1.00 0.91 0.84 0.78 0.70 0.6523 1.35 1.21 1.10 1.00 0.92 0.85 0.78 0.7025 1.47 1.32 1.19 1.09 1.00 0.93 0.83 0.7627 1.59 1.42 1.28 1.17 1.08 1.00 0.90 0.8230 1.77 1.58 1.43 1.30 1.20 1.11 1.00 0.9133 1.94 1.74 1.57 1.43 1.32 1.22 1.19 1.0036 2.12 1.89 1.71 1.56 1.44 1.33 1.20 1.0940 2.35 2.10 1.90 1.74 1.60 1.48 1.33 1.2145 2.65 2.37 2.14 1.96 1.80 1.67 1.50 1.3650 2.94 2.63 2.38 2.18 2.00 1.85 1.67 1.5255 3.24 2.89 2.62 2.39 2.20 2.04 1.83 1.6760 3.53 3.16 2.86 2.61 2.40 2.22 2.00 1.8268 4.00 3.58 3.24 2.96 2.72 2.52 2.2775 4.41 3.95 3.57 3.26 3.00 2.7884 4.94 4.42 4.00 3.65 3.3690 5.30 4.74 4.28 3.91102 6.00 5.37 4.86Number of Teeth in Driver Gear & Sprocket36 40 45 50 55 60 68 7519 0.53 0.48 0.42 0.38 0.35 0.32 0.28 0.2521 0.58 0.53 0.47 0.42 0.38 0.35 0.31 0.2823 0.64 0.58 0.51 0.46 0.42 0.38 0.34 0.3125 0.70 0.63 0.56 0.50 0.46 0.42 0.37 0.3327 0.75 0.68 0.60 0.54 0.49 0.45 0.40 0.3630 0.83 0.75 0.67 0.60 0.55 0.50 0.4433 0.92 0.83 0.73 0.66 0.60 0.5536 1.00 0.90 0.80 0.72 0.6540 1.11 1.00 0.89 0.8045 1.25 1.13 1.0050 1.30 1.2555 1.53=Chain speed in f.p.m. x pull in pounds33,000Chain speed, except for high speed RC and silent chains, shouldnot exceed 500 ft. per min. Working load should be held under 1 ⁄6 theultimate strength for speeds up to 200 f.p.m., 1/10 where speed isbetween 200 and 300 f.p.m., and less if speed exceeds 300 f.p.m.233