U.S. TSUBAKI BS/DIN ROLLER CHAIN

CHAIN DRIVE SELECTION

SELECTION PROCEDURE 5) After determining the number of teeth Number of Pitches of Chain for the small , confirm if the 1) The following factors must be will meet the shaft diameter N –N 2 considered when selecting roller 2 1 requirements. N +N ( 6.28 ) chains for transmission needs. L= 1 2 +2C+ • The power to be transmitted. 6) The number of teeth for the large 2 C • The speed and the diameters of the sprocket is determined by multiplying Any fraction of L is counted as one pitch. driving shaft and the driven shaft. the number of teeth for the small A - DRIVE CHAINS • The distance between the centers of sprocket by the speed ratio. While it is Center Distance in Pitches the shafts. preferable that the number of teeth for the small sprocket be greater than 15, 1 2) Use Table I to obtain the service C= { 2L–N 1–N 2 it is suggested that the number of 8 factor. (The “Service Factor” table teeth for the large sprocket not exceed refers to the type of machine and 120. By reducing the number of teeth 2 8 2 source of power.) +” (2L–N 1–N 2) – (N 2–N 1) for the small sprocket, the number of 9.86 } 3) Multiply the HP value by the service teeth for the large sprocket can also factor to obtain the design HP value. be reduced. L: Number of pitches of chain

N1: Number of teeth (small sprocket)

4) Use Table III page A-52 to obtain the Table II: Multiple-Strand Factor N2: Number of teeth (large sprocket) appropriate chain number and the C: Center distance in pitches Number of Roller Multiple-Strand number of teeth for the small sprocket Chain Strand Factor by referring to the number of Chain Speed revolutions of the high speed shaft Double Strand 1.7 P • N • n (the driving shaft when the speed is S= 12 (ft./min.) reduced; the driven shaft when the Triple Strand 2.5 speed is increased) and the design HP value. For a smoother , S: Chain speed (ft./min.) a smaller pitch chain is suggested. If a P: Chain pitch (inch) single strand chain does not satisfy N: Number of teeth of sprocket the transmission requirements, use a n: rpm of the sprocket multi-strand chain. If the distance between the shafts and the diameter Chain Tension from HP of the sprockets must be relatively small due to space considerations, a T= 33,000 • HP (lbs.) multiple strand roller chain with a S smaller pitch may be used. T: Chain tension (lbs.)

Table I: Service Factor

Source of Power Electric Internal Combustion Engine Type of Impact Machines Motor or With hydraulic Without hydraulic Turbine drive drive

Belt conveyors with small load fluctuation, chain conveyors, Smooth centrifugal blowers, general textile machines, machines with small 1.0 1.0 1.2 load fluctuation.

Centrifugal compressors, marine engines, conveyors with some load Some impact fluctuation, automatic furnaces, dryers, pulverizers, general machine 1.3 1.2 1.4 tools, compressors, general work machines, general paper mills.

Presses, construction or mining machines, vibration machines, oil well Large impact 1.5 1.4 1.7 rigs, rubber mixers, general machines with reverse or impact load.

A-51 al I:B olrCanSlcinTable Selection Chain Roller BS III: Table The “Serviceare The Factors” TableI givenin changesignificantlynotdoesload The 4) suggested Thelubrication systemshown 3) transmissiontwo The a inshaftsare 2) operatedchainsare Theunderordinary 1) conditions: followingtheselectionThebasedon table is Factor” given in Table II must be used.bemust Factor”TableII given in multiple-strand“Multiple-Strandchain,the estimatea serviceordertotheoflife exactlysame.Innotthe strandeachis totalnumber ofstrands, since theload on horsepowerthestrand byonerating of calculatedmultiplyingsimplyby the multiple-strandrollerchainscannotbe horsepowerincreasetheThein rating of chain.conditionstheof life affectwill the variousoperatingconditions. loadThe underusedchainsarethewhenused duringtransmission. used.is TableIV on properlyinstalled. horizontalpositionchainsaretheand exceptionallyhigh. humiditythewhenpresentis or whereabrasivecorrosiveorisdust gas atmospherean inused be tonot are between140°F.Theyandrange15°Fis conditions.ambientThetemperature lubrication system.lubrication of details for A-77 page to Refer Note: = 73.35 74 links74 73.35 = = (c) RS16B-1 chain and 25-tooth sprocket 25-tooth and chain RS16B-1 (c) sprocket 17-tooth and chain RS16B-2 (b) sprocket 25-tooth and chain RS12B-3 (a) selected the table, selection the to According hp40 = 1.0• hp 40 = the and size chain the Obtain 3 Step HPdesign Obtain HP SF Design • transmitted be to HP = 2 Step 1.0 (SF): factor Service the determine and I Table Use 1 Step inches 24 Max. limit: Space 7. inches 19 distance: Center 6. rpm 200 shaft: Driven 5. rpm 600 shaft: Driving 4. hp40 transmitted: be to HP 3. Motor Electric power: of Source 2. Blowers Centrifugal application: of Type 1. Data: Example * * * 12 = = (S) speed Chain the determine to IV Table Use 4 Step = of pitches of number the Obtain 5 Step 2 1 19

For (b), the necessary number of teeth for teeth of number necessary the (b), For for teeth of number necessary the (c), For for teeth of number necessary the (a), For 2 chain and sprocket rpms are: rpms sprocket and chain rpm. 600 and hp 40 for table selection the from sprocket small the of teeth of number factor. service lubrication method. lubrication requirements. necessary the all fulfill to used be must teeth 51 and teeth 17 and RS16B-2, of combination A inches). 24 < inches 16.8 + inches (5.9 limitation space the satisfies It inches). 16.8 dia: (outside 51 and inches) 5.9 dia: (outside 17 are sprockets large and small the both inches).24 > inches 24.4 + inches (8.4 again limitation space the exceeds It respectively. inches), 24.4 dia. (outside teeth 75 and inches) 8.4 dia. (outside teeth 25 are sprockets large and small both installed. be sprocketscannotTherefore,inches).these 24 > inches 18.3 + inches (6.3 limitation the exceeds teeth, 75 for inches 18.3 and teeth 25 for inches 6.3 sprockets, both of diameter outside the But rpm). (200/600 1/3 is ratio speed the since respectively, teeth 75 and teeth 25 are sprockets large and small both chain (L). chain suggested.is B System 17 + 51+ 17 1 • 600 • 17 • 600 • 1 N 1 + N+ 12 2 + 2C + + 2C + + 2 + • = 850 ft./min.850 =

19 19 ( ) ( P • N • n• N • P + + N

6.28 2 C - N- ( ) ( 51 - 17- 51 1 6.28 1 2 2 A-52

A - DRIVE CHAINS