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Roller Drive Chain Selection and Engineering Information

Advancing Chain technology231 Roller Drive Chain SelectionTechnical Information29 Required Information for Drive Selection :1. Type of input power (electric motor, internal combustionengine, etc.).2. Type of equipment to be Horsepower (HP) to be Full load speed of the fastest running shaft (RPM).5. Desired speed of the slow-running : If thespeeds are variable, determine the horsepower to betransmitted at each Diameters of the driver and driven Center distance of the : If this distance is adjustable, determine theamount of Position of Drive and space limitations (if any).

Pumps centrifugal U proportioning M reciprocating H single acting, three or more cylinders M double acting, two or more cylinders M single acting, one or two cylinders M double acting, one cylinder M rotary gear type, vane, or lobe U Rubber and Plastics Industries crackers H laboratory equipment M mixing mills H refiners M rubber calendars M ...

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Transcription of Roller Drive Chain Selection and Engineering Information

1 Advancing Chain technology231 Roller Drive Chain SelectionTechnical Information29 Required Information for Drive Selection :1. Type of input power (electric motor, internal combustionengine, etc.).2. Type of equipment to be Horsepower (HP) to be Full load speed of the fastest running shaft (RPM).5. Desired speed of the slow-running : If thespeeds are variable, determine the horsepower to betransmitted at each Diameters of the driver and driven Center distance of the : If this distance is adjustable, determine theamount of Position of Drive and space limitations (if any).

2 9. Conditions of the Drive . Drives with more than twosprockets, idlers, or unusual conditions such as severelyabrasive or corrosive environments, severely high or lowtemperatures, widely fluctuating loads, frequent startsand stops, etc., require special attention. It is advisableto consult with Renold Jeffrey Engineering personnel inthese :NNumber of teeth on large sprocketnNumber of teeth on small sprocketRRPM of large sprocketrRPM of small sprocketCShaft center distance in Chain pitchesHPHorsepower of Drive motorStep 1: Determine the Class of Driven the Application Classifications chart on page 233,determine the class of driven load to be uniform, moderate,or heavy 2.

3 Determine the Service Table 1, determine the service factor for theapplication under 1: Service FactorsStep 3: Calculate the Design Horsepower = HP x Service FactorThe design horsepower equals the horsepower to betransmitted times the service factor found in Table 4: Select the Chain the Quick Selector Chart on page 234, make atentative Chain Selection as follows:a) Locate the design horsepower calculated in Step 3 on the vertical axis by reading up the strand columns(single, double, etc.) in order until the design horsepoweris located.

4 The number of strands indicated at the top ofthe column in which the design horsepower is FIRST located is usually the recommended Chain : Using the fewest number of Chain strands willusually result in the most economical )Locate the RPM of the small sprocket on the horizontalaxis of the ) The intersection of the two lines (design horsepower andsmall sprocket RPM) will be in an area designated withthe recommended Chain pitch. If the intersection is nearthe borderline of the designated pitch area, the chainson both sides of the borderline should be evaluated toassure the best overall Drive Chain Selectionand Engineering InformationClass of DrivenLoadType of Input PowerInternalCombustionEngine withHydraulic Drive Electric Motoror TurbineInternalCombustionEngine 11/19/08 12:45 PM Page advancing Chain technology232 Roller Drive Chain Selection29 Technical InformationStep 5.

5 Select the Number of Teeth on the small minimum number of teeth are found in the horsepowertables on pages 6-19. To determine, first calculate theHorsepower Table Rating (HP Table) from the followingformula:HP Table = Design HP (Step 3)Multiple Strand Factor (Table 2)Horsepower Table Ratings are given for each Chain size onpages 6-19. Turn to the appropriate page from the tentativeselection found in Step 4 and choose the number of teethfor the small sprocket using the following method:a) Determine the Horsepower Table Rating from the )Read down the column in the horsepower table under theRPM of the small sprocket until the required HorsepowerTable Rating is located.

6 Read across the table to the firstcolumn (No. of Teeth Small Sprocket). This is theminimum number of teeth to specify for this the lubrication method specified in the horsepowertable for the selected Chain . This lubrication methodshould be used in order to achieve reasonable 2: Multiple Strand FactorsStep 6: Determine the Number of Teeth on the large = (r x n)/RThe number of teeth on the large sprocket equals the RPMof the small sprocket times the number of teeth on the smallsprocket divided by the RPM of the large :For sprockets with less than 24 teeth, speeds over 600 RPM, ratios greater than 4:, heavy loading, or corrosiveenvironments.

7 The use of hardened-tooth sprockets 7: Determine the Recommended Minimum Center DistanceC = (2N + n)/6 This formula is to be used as a guide for the MINIMUM center distance only. The final Selection may vary due to:1. Required clearance dimensions2. Allowing the final Chain length to be an even number : An odd number of pitches requires anoffset link, which should be avoided if 8: Check the Final the checklist found on page 235 (Table 4) to assure thebest balance of Drive life, performance, and 9: Calculate the Chain Length in Pitches = [(N + n)/2] + (2C) + (K/C)To determine K , subtract the number of teeth on the smallsprocket from the number of teeth on the large Table 5 on page 236.

8 Note that C is in chainpitches, thus:C = Center Distance (inches)/ Chain Pitch (inches)The required Chain length in feet (L) may be obtained from:L = ( Chain Length in Pitches x Chain Pitch in Inches)/12 Slow Speed SelectionIf the linear Chain speed is less than 160 , then achain that is one size smaller than selected with the abovemethod may be used. To verify, check to see if thecalculated Chain tension (T) is less than the Rated WorkingLoad of the Chain . Rated Working Load values areobtained in the specification tables found on pages the following formula to calculate T:S = ( Chain Pitch x n x r)/12T = [(HP x 33,000)/S] x F (Table 3)Table 3: Speed FactorNo.

9 Speed ( )Factor (F)0 - 50150 - - 11/19/08 12:45 PM Page advancing Chain technology233 Roller Drive Chain SelectionTechnical Information29 Agitatorspure liquidsUliquids and solidsMliquids variable densityMBlowersCentrifugalULobeMVaneUBre wing and Distillingbottling machineryUbrew kettles cont. dutyUcookers cont. dutyUmash tubs cont. dutyUscale hopper, freq. startsMCan Filling MachinesUCane KnivesMCar DumpersHCar PullersMClarifiersUClassifiersMClay Working Machinerybrick pressHbriquette machineHclay working machineMpug millMCompressorsCentrifugalUlobeMrecipro cating UassemblyUbeltUbucketUchainUflightUovenU screwUConveyors.

10 Heavy DutyapronMassemblyMbeltMbucketMchainMfli ghtMovenMlive rollerMreciprocatingHscrewMshakerHCranes main hoistsUbridge travelMtrolley travelMCrusheroreHstoneHsugarMDredgescab le reels and conveyorsMcutter heads and jigsHmaneuvering winchesMpumpsMscreen drivesHstackersMElevatorsbucket uniform loadUbucket heavy loadMbucket continuousUcentrifugal dischargeUElevators (continued)escalatorsUfreightMgravity dischargeUman lifts and passengerHFanscentrifugalUcooling towersUinduced draftMlarge (mine, etc.)Mlarge industrialMsmall diameterUFeedersapron & beltMdiscUreciprocatingHscrewMFood Industrybeet slicerMcereal cookerUdough mixerMmeat grinderMGenerators except welding UHammer MillsHHoistsheavy dutyHmedium dutyMskip hoistMLaundryreversing washersMtumblersMLine Shaftsprocessing equipmentMlight or other line shaftsULumber Industrybarkers conveyorMchain or drag sawHchain transferHcraneway transferHde-barking drumHedger or gang feederMgreen chainMlive rollsHlog deckHlog haul incline or wellHlog


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