Technical Manual for Ribbed Belt Drives

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Drive DesignDrive Service Factor c 2The drive service factor c 2 takes into account the length of time thedrive is operational in a 24 hour period and the type of driver anddriven units. It applies exclusively to two pulley drives and cannotbe applied for other working conditions, such as drives with idlerand guide pulleys. Pages 26 and 27 give the design bases fordrives with more than two pulleys. Adverse operating conditionssuch as high ambient temperatures, high humidity, the use of anidler pulley, etc., are not considered due to the obvious difficultiesin creating factor tables to cater for every eventuality. The Tablegiven below should thus be regarded as a guideline. In specialTable 4cases e.g. high starting load (direct starting of fans), drives withhigh starting frequency, unusual shock loading, or the regularacceleration/ deceleration of mass, the load factor should beincreased.Typical valueWhere the starting load is more than 1.8 times thestandard running load, the minimum service factor c 2should be determined by dividing the starting loadfactor by 1.5. Example: Starting load factor M A =3.0;c 2 selected 2.0. Where the application is especiallyproblematical please consult our engineers.AC and three-phase motorswith normal starting load (up to1.8 times normal running load)e.g. synchronous and singlephasemotors with auxiliaryphase, three-phase motors withdirect on-line start, star delta orcommutator starter, DC shuntwound motors, internal combustionengines and turbines n>600 min -1 .Types of Prime MoverHours per day dutyAC and three-phase motorswith high starting load (morethan 1.8 times normal runningload) e.g. single phase motorswith high starting torque, DCmotors series and compoundwound, internal combustionengines and turbines n ≤ 600min -1 .Types of Driven Machine10 and over 1010 and over 10under to16over 16under to 16over 16Light dutyLight dutyAgitators for liquids with uniform consistency,generators up to 0.05 kW, small conveyor beltsfor lightweight material, fans up to 0.05 kW,rotary pumps up to 0.05 kWConveyor belts for lightweight material, fansfrom 0.06 to 0.1 kW, rotary pumps from 0.06to 0.1 kW1.1 1.1 1.2 1.1 1.2 1.31.1 1.2 1.3 1.2 1.3 1.4Medium dutyHeavy dutyVibrating screens, mine fans, agitators for liquidswith fluctuating consistency, compressors,screw presses, woodworking machinery, conveyorbelts for heavy material, elevators, conveyorbelts, fans above 0.8 kW, drills, millingmachines, grinding machines, light lathes,bakery machinery, circular spinning frames,rotary pumps above 0.11 kW, laundry machineryKneaders, mills, mixers, pumps, drying drums,general milling equipment, centrifuges, agitatorsfor plastic materials with fluctuating consistency,bucket conveyors, centrifugal fans, parallelplaning machines, weaving looms1.2 1.3 1.4 1.3 1.4 1.51.3 1.4 1.5 1.4 1.5 1.6Heavy dutyPaper making machinery, plate conveyors, slagmills, calenders, drilling rigs, heavy duty lathes,punches, shears, draw benches, piston pumpsup to 2 cylinder1.4 1.5 1.6 1.5 1.7 1.8Extra heavy dutyDredgers, heavy duty grinders, rolling mills,mixers, sawmills, calenders1.6 1.7 1.8 1.6 1.8 2.013
Drive DesignA Guide to Selecting Ribbed Belt SectionsBy using the following diagram and considering economy and sizeit is possible to determine the best Ribbed Belt section. Optimumutilisation of power and efficiency is achieved by the selection ofthe largest possible pulley diameter in relation to the section used.The limits to the permissible circumferential speeds must be observed.Section PH v max = 60 m/sSection PJ v max = 60 m/sSection PK v max = 50 m/sSection PL v max = 40 m/sSection PM v max = 30 m/sExperience has shown that minimum pulley diameters should beavoided. Such drives are not cheap and require large face widths.In such borderline cases the use of the next smaller belt section onsimilar pulley diameters will often save both cost and space.In these boundary areas, it is advisable to design the drive withboth sections.Diagram 1Small pulley speed n k (min -1 )14Design power P B = P x c 2 (kW)
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: Drive DesignMinimum Allowances x/y
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 and 24: Section PMPower Ratings P N (kW) pe
Page 25 and 26: Special DrivesV-Flat DriveCalculati
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

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