383 Iron Rubber® Belts are selected based on applied Load Torque (Nm) or Transmission Capacity (kW). Q Selection Condition Conditions Needed For Selecting · Pulley Pitch Diameter: dp (mm) · Pulley Wrap Angle: (°) · Pulley Rotational Speed: n (rpm) · Load Torque: Md (Nm) or Transmission Capacity: P (kW) Fundamentally use the Drive side pulley for calculations. When the Driven side pulley is also transmitting torque, calculate for the Driven side also, and make the belt selection based on more severe side. В dp Ex. 1) When Drive Pulley Diameter > Driven Pulley Diameter, also calculate for the Driven side pulley. Ex. 2) When the driven pulley is connected to a roller, also calculate for the Driven side. Drive Driven Roller Driving Table 1: Min. Pulley Tooth Count Rotational Speed (rpm) MA3 MA5 MA8 AT5 AT10 T5 T10 MXL XL L H 600 or Less 18 15 20 15 15 12 14 12 10 10 14 720 or Less 12 900 or Less 22 1200 or Less 16 24 18 16 16 1800 or Less 20 20 26 16 20 14 18 14 12 14 18 3000 or Less 22 24 28 18 22 16 20 16 16 20 Q Selection Method [Step 1] Load Torque, Transmission Capacity Corrections Back-side Idler Correction t 8IFO B 5SBOTNJTTJPO $BQBDJUZ JT HJWFO BT B DPOEJUJPOBM QBSBNFUFS t 8IFO B -PBE 5PSRVF JT HJWFO BT B DPOEJUJPOBM QBSBNFUFS P = P0×(1+0.1×f) Md = Md0×(1+0.1×f) [Step 2] Selection of Belt Model Select belt model using Simplified Selection Chart on P.385. t 8IFO B 5SBOTNJTTJPO $BQBDJUZ JT HJWFO BT B DPOEJUJPOBM QBSBNFUFS t 8IFO B -PBE 5PSRVF JT HJWFO BT B DPOEJUJPOBM QBSBNFUFS Select belt model based on Transmission Capacity and Pulley Speed (See Table 6) Select belt model based on Load Torque and Number of Sm. Pulley Tooth (See Table 7) [Step 3] Selection of Pulley Tooth Count Z Note the Min. Pulley Tooth Count when selecting the number of tooth. (See Table 1) [Step 4] Selection of Belt Tooth Count ZB <When pulley ratio is not 1:1> Obtain belt tooth count from belt length. Select belt loop length from shaft distance (C), Lg. Pulley Dia., and Sm. Pulley Dia. C : Shaft Center Distance Dp : Large Pulley Pitch Circle Diameter (mm) dp : Small Pulley Pitch Circle Diameter (mm) Lp : Belt length (mm) π(Dp+dp) (Dp−dp)2 Lp=2C + + 2 4C Calculate number of tooth from belt length. ZB : Number of Belt Tooth t : Belt Pitch (exT10 t=10) Lp ZB= t <When pulley ratio is 1:1> C : Shaft Center Distance z: Number of Pulley Tooth t : Belt Pitch 2C ZB= + Z t [Step 5] Calculating Tooth Mesh Count <When pulley ratio is not 1:1> <When pulley ratio is 1:1> z1 : Small Pulley Number of Tooth z2 : Large Pulley Number of Tooth z1 t(z2−z1) ZE= × cos−1 180 2πC z : Number of Pulley Tooth z ZE= 2 However, Max. Number of Effective Meshed Teeth on the right table will be the upper limit. Table 2: Max. Number of Effective Meshed Teeth Belt Type Max. Number of Effective Meshed Teeth Long Synchronous Belt 6 Open End Belt 12 Md : Transmission Capacity Used for Selection (Nm) Md0 : Transmission Capacity Given as Conditional Parameter (Nm) f : Number of Back-side Idlers P : Transmission Capacity Used for Selection (kW) P0 : Transmission Capacity Given as Conditional Parameter (kW) f : Number of Back-side Idlers Timing Belt Selection of Synchronous Belt 1
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