DRIVE CHAINS - Tsubaki

Selecting a Roller ChainSelection example using the general selection method(Step 1) Required dataMachine used : AgitatorType of shock : Moderate shockSource of Power : MotorRated power : 11 kW 1800 r/minHigh speed shaft: Shaft diameter 45mm 90 r/minLow speed shaft : Shaft diameter 60mm 30 r/minDistance between shafts: 350 mmSpace limitation : 700 mm(Step 2) Determine the service factorService factor Ks = 1.3 from Table 2 Service Factor(Step 3) Determine the design kWDesign kW = 11 kW X 1.3 = 14.3 kW(Steps 4 and 5) Determine the chain and the numberof teeth for the sprocketDecide on the chain number and number of teeth of thesmall sprocket derived from the speed of the high speedshaft, at 90 r/min, and the design kW (14.3 kW).(1)17 T of the single strand RS100 is derived from the basicselection figure and the kilowatt ratings table. Since thespeed ratio is 1/3, the number of teeth will be 17T and 51T ofRS100. But, with an outer diameter of 17T at 189 mm and51T at 534 mm, these are not adequate because they do notfit in the required space. 189 + 534 > 700(2) Checking multi-strand chains:19T and 57T of the RS80-2 is derived for double-strand, andthe outer diameter of its sprockets are 167 mm and 476 mm,which is within limits. Check RS80 kilowatt ratings table forthe kW ratings of 19T of RS80-2.The kW ratings for the small sprocket number of teeth 19T is5.06 kW at 50 r/min, and 9.44 kW at 100 r/min. By calculatingproportionally using the tabular difference between them,drive kW for 90 r/min is 8.56 kW.(3) This 8.56 kW is the kilowatt rating of single-strand chain, andthe kilowatt rating of double-strand chain that will be used isderived from the multi-strand factor in Table 1.8.56 kW X 1.7 = 14.6 kWMotorAgitator(Step 6) Check the bore diameter(1) Check the bore diameter on the dimension table. Maximumbore diameter for RS80-2-19T is 63 mm, and it can be usedfor the required bore diameter of 45 mm.Maximum bore diameter for RS80-2-57T is 80 mm, and it canbe used for the 60 mm.(Step 7) Determine the distance between shaftsWith a distance between shafts of 350 mm,1674762350 , and it will fit into the required space.Number of the links is calculated as( )57 19L571922 350 6.2825.4 35068.225.4In order to have an even number of links, raise the valuebelow the decimal point to an integer to get 70.(Step 8) Check lubrication methodSince the small sprocket is RS80-2-19T at a speed of 90 r/min,according to the kilowatt ratings table, lubrication method A willbe used. It is necessary to have an oil bath lubrication orlubrication with a slinger disc.For selecting lifting or shuttle traction applications, do not use theGeneral Selection method. Use the Allowable Load Selection method.Reason: It is assumed that the braking force will be large when abalance weight is used, even if the motor capacity is small.2Before Use For Safe Use Standard Roller Chains Lube-Free Roller Chains Heavy Duty Roller Chains Corrosion Resistant Roller Chains Specialty Roller Chains Accessories Selection Handling(4) This kW rating, 14.6 kW, satisfies the design kW (14.3 kW).140