MISUMI WEBINDEX

364 TECHNICAL INFORMATION [Step 4] Determining Number of Teeth of Large and Small Pulley, Belt Length, Inter-Shaft Distance (1) Select the number of teeth of large and small pulley from P.125~135, which can satisfy the predeterminated speed ratio. (However, select the small pulley with number of teeth more than Min. Number of Teeth on Table 26.) (2) Determine approx. belt circum. length (Lp') in terms of temporary inter-shaft distance (C'), diameter of large pulley (Dp) and diameter of small pulley (dp). (Calculate pulley diameter with P.D. dimensions.) (3) Determine a belt circum. length (Lp') that is the nearest value to approx. belt circum calculate the correct inter-shaft distance using the following formula. Number of Teeth of Large Pulley Speed Ratio= Number of Teeth of Small Pulley C' : Temporary Inter-shaft Distance Dp : Pitch Diameter of Large Pulley (mm) dp : Pitch Diameter of Small Pulley (mm) Lp' : Approx. Belt Circum. Length (mm) Dp : Pitch Diameter of Large Pulley (mm) C : Inter-shaft Distance dp : Pitch Diameter of Small Pulley (mm) Lp : Belt Circum. Length (mm) π(Dp+dp) (Dp−dp)2 Lp'=2C'+ + 2 4C' b=2Lp−π(Dp+dp) b+ b2−8(Dp−dp)2 C= 8 [Step 5] Determining Belt Width (1)Calculate an approx. belt width using the following formula, and then select a belt width (Bw':mm) that is the nearest value to the approximated value. Pd Bw'= × Wp Ps·Km Pd: Design Power Ps: Reference Transmission Capacity……Use the Reference Transmission Capacity Table on P.125~135. Km: Engagement Correction Coefficient (Table 27) Wp: Reference Belt Width (Table 28) Table 27. Engagement Correction Coefficient (Km) Table 28. Reference Belt Width (Wp) Zd· No. of Teeth Engaged (Zm)= 360° 57.3(Dp−dp) =180°− C Zd: No.of Teeth of Small Pulley Dp: Pitch Diameter of Large Pulley (mm) C:Inter-shaft Distance (mm) : Contact Angle (°) dp: Pitch Diameter of Small Pulley (mm) (2)Check if Design Power (Pd) satisfies the following formula. (If not, select the belt width of one size larger again.) Table 29. Width Correction Coefficient (Kb) No. of Teeth Engaged Zm More than 6 5 4 3 2 Km 1.0 0.8 0.6 0.4 0.2 *Km 1.0 0.7 0.5 - - Type of Belt MXL XL L H S2M S3M S5M S8MS14MMTS8M Reference Belt Width 6.4 25.4 25.4 25.4 4 6 10 60 120 60 Type of Belt P2M P3M P5M P8M T5 T10 Reference Belt Width 4 6 10151010 Type of Belt Belt Width Width Correction Coefficient Nominal mm Kb MXL 019 4.8 0.72 025 6.4 1.00 037 9.5 1.57 050 12.7 2.18 XL 025 6.4 0.15 031 7.9 0.21 037 9.5 0.28 050 12.7 0.42 L 050 12.7 0.42 075 19.1 0.71 100 25.4 1.00 150 38.1 1.56 H 075 19.1 0.71 100 25.4 1.00 150 38.1 1.56 200 50.8 2.14 Type of Belt Belt Width Width Correction Coefficient Nominal mm Kb S2M 040 4 1.00 060 6 1.59 100 10 2.84 S3M 060 6 1.00 100 10 1.79 150 15 2.84 S5M 100 10 1.00 150 15 1.59 250 25 2.84 S8M MTS8M 150 15 0.21 250 25 0.37 300 30 0.45 400 40 0.63 S14M 400 40 0.29 600 60 0.45 Type of Belt Belt Width Width Correction Coefficient Nominal mm Kb P2M 40 4 1.00 60 6 1.59 P3M 100 10 1.78 150 15 2.84 P5M 100 10 1.00 150 15 1.59 P8M 150 15 1.00 250 25 1.79 T5 100 10 1.00 150 15 1.60 200 20 2.30 250 25 2.90 T10 150 15 1.60 200 20 2.30 250 25 2.90 300 30 3.50 400 40 4.60 500 50 5.80 Type of Belt Belt Width Width Correction Coefficient Nominal mm Kb 2GT 4 4 1.00 6 6 1.67 9 9 2.67 3GT 6 6 1.00 9 9 1.66 15 15 2.97 EV5GT 9 9 0.53 12 12 0.76 15 15 1.00 EV8YU 15 15 0.71 20 20 1.00 25 25 1.29 · Pd<Ps · Km · Kb Q2GT · 3GT · EV5GT · EV8YU · Pd<Ps · Km · Kb · KL Pd : Design Power Ps : Reference Transmission Capacity Km : Engagement Correction Coefficient Kb : Width Correction Coefficient (Table 29) KL : Length Correction Coefficient (Table 30) &For belt types P∓M and UP∓M, substitute *Km for meshing compensation factor Table 26. Allowable min. number of teeth Rotary Speed of Small Pulley (rpm) Type of Belt, Minimum Number of Teeth MXL XL L H S2M S3M S5M S8MS14MP2M P3M P5M P8MUP5M UP8M MTS8M T5 T10 2GT 3GTEV5GTEV8YU 900 or Less 1211141616161624 − 14141822182224121612141826 Over 900 1200 or Less 15 11 14 18 16 16 20 25 40 14 14 20 24 20 24 24 14 18 14 14 20 28 Over 1200 1800 or Less 15 12 16 20 18 18 24 28 48 14 14 24 26 24 26 26 16 20 16 16 24 32 Over 1800 3600 or Less 1616192420202430 − 16182828282828182218202836 Over 3600 4800 or Less − 16202420202432 − 182030303030281822202030 − Over 4800 10000 or Less − − − −202026− −202840−40− − − − − − − − Length Correction Coefficient(KL) 0.80 0.90 1.00 1.10 1.20 2GT Belt Length(mm) 130 or less 131~182 183~280 281~419 420 or less 3GT Belt Length(mm) 190 or less 191~260 261~400 401~599 600 or less EV5GT Belt Length(mm) 440 or less 441~550 551~800 801~1100 1001 or less EV8YU Belt Length(mm) 600 or less 601~900 901~1250 1251~1799 1800 or less Table 30. Length Correction Coefficient(KL)

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