Technical Manual for Ribbed Belt Drives

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Special DrivesV-Flat DriveThe V-Flat drive utilises a Ribbed Belt pulley and a flat faced pulley.Under certain conditions, this type of drive can be used for driveswhich are subject to shock loadings or have high moments ofinertia. Because flywheels or flat pulleys are quite often alreadyfitted, drive costs can be reduced. When converting a flat belt driveto a V-Flat drive, it is usually economical to continue to use thelarger flat pulley.C = Drive centre distance (mm)b = Flat pulley face width (mm)b 2 = Ribbed Belt pulley face width (mm)D a = Flat pulley outside diameter (mm)D Zd ef= Allowance for determining the theoreticaldiameter= Effective diameter of Ribbed Belt pulley(mm)= Allowance for determining the flat pulleyface width(mm)(mm)h = Crown height per 100 mm of pulley face width (mm)r= Speed ratioL eth = Calculated belt effective length (mm)K= K factord eC23
Special DrivesV-Flat DriveCalculation of V-Flat DrivesThe calculation for a V-Flat drive is undertaken in the same manneras shown on pages 15 to 17. The following important requirementsmust be checked so as to ensure a reliable and efficient V-Flatdrive.● The grooved pulley must always be the small pulley.● The V-Flat drive is particularly economical whenD a – d eK = lies between 0.5 and 1.15.aThe ideal drive is achieved when K = 0.85. If the “K” factor fallsoutside the recommended range, it is then more economical touse a normal ribbed belt drive with grooved pulleys.● The following recommendations are made based upon theabove requirements:Speed ratioDrive centredistanceK-FactorDi = a + D Z≥ 3c actual ≤ D ac = D a – d e0.85K = D a – d eaK actual 0.5 to 1.15● When calculating the number of ribs and the belt tension, caremust be taken to ensure that a special arc of contactcorrection factor c 1 as detailed in the following table 10 isapplied.Table 10 Arc of contact correction factor c 1(for V-Flat drives only)K =D a – d eCβ ≈ c 10 180° 0.750.07 176° 0.760.15 170° 0.770.22 167° 0.790.29 163° 0.790.35 160° 0.800.40 156° 0.810.45 153° 0.810.50 150° 0.820.57 146° 0.830.64 143° 0.840.70 140° 0.850.75 137° 0.850.80 134° 0.860.85 130° 0.860.92 125° 0.841.00 120° 0.821.07 115° 0.801.15 110° 0.781.21 106° 0.771.30 100° 0.731.36 96° 0.721.45 90° 0.70The length calculation is for the effective length L e . Therefore, inorder to obtain the theoretical calculation diameter, an allowanceD z must be added to the flat pulley outside diameter.Table 11: Effective Line Difference h bSection PH PJ PK PL PMd e + 2 b eL eth ≈ 2 c + 1.57 (d e + D a + D Z ) +h b 0.80 1.25 1.60 3.50 5.00D Z 1.60 2.70 3.50 6.50 11.00Calculation of the Effective Length(D a + D Z – d e ) 24 cIn addition to the drive design on page 15 to 17, thestatic belt tension for V-Flat Drives must be calculatedwith the adjoining formula.Formula:Calculation of the static belt tension for V-FlatDrives500 · (2.25 – cT = 1 ) · P B+ k · v 2c 1 · z · v24
Page 1 and 2: Technical Manualfor Ribbed Belt Dri
Page 3 and 4: Distribution Organisation North Ame
Page 5 and 6: ContentsIntroduction . . . . . . .
Page 7 and 8: Standard RangeRibbed BeltsPosition
Page 9 and 10: Drive DesignAbreviations used in Fo
Page 11 and 12: Drive DesignBelt Length Correction
Page 13 and 14: Drive DesignMinimum Allowances x/y
Page 15 and 16: Drive DesignA Guide to Selecting Ri
Page 17 and 18: Drive DesignFormulae and Drive Desi
Page 19 and 20: Section PHPower Ratings P N (kW) pe
Page 21 and 22: Section PKPower Ratings P N (kW) pe
Page 23: Section PMPower Ratings P N (kW) pe
Page 27 and 28: Special DrivesTensioning / Guide Pu
Page 29 and 30: Ribbed Belt PulleysMeasuring Pulley
Page 31 and 32: Ribbed Belt Pulleysbored for taper
Page 41 and 42: Design HintsRibbed Belt TensionThe
Page 43 and 44: Design HintsRibbed Belt TensionII.
Page 45 and 46: Design HintsOptikrik Tension Gauges
Page 47 and 48: Design HintsLength Tolerances - Ins
Page 49 and 50: Design HintsProblems - Causes - Rem
Page 51 and 52: Data SheetFor Drive Calculation/Che
Page 53 and 54: Standard Rangeoptibelt-TB Taper Bus

Technical Manual for Ribbed Belt Drives

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