Roller Chain - Tsubaki

Leaf ChainLEAF CHAIN SELECTION GUIDELINES1. Obtain the following factors that are specific to your application:• Chain Speed (Operation Speed)• Number of operations (reciprocations) per day• Working load (Including: attachment weight, inertia force and impact force)When the chain speed exceeds 100 ft./min, and/or, the number of operations (reciprocations) exceeds 1,000 times/day, wearproblems may happen. In these cases, Tsubaki RS Roller Chain is recommended - not leaf chain.Drive Chain2. Determine leaf chain type.• BL type is generally recommended.• AL type can be used when the application has no impact load and wear problem.(Number of strokes does not exceed 100 times/day)3. Determine Chain Size:Working load X Service Factor X Safety Factor < Minimum Tensile Strength(Table 1) (Table 2)4. If the chain is operated with a lesser safety factor than the one shown in Table 2, the pin may rotate and lead to chain breakage.Even if the chain is operated with the proper safety factor, the lack of lubricant may cause pin rotation, so the chain must beperiodically lubricated.5. In case the safety factor and/or chain selection are subject to some official law and/or regulation, compare the outcomes of boththe specified selection and this selection, and select the safer of the two.Table 1 Service factorImpact Applications Service FactorSmooth TransitionStart and stop are smooth.Load fluctuation is low (eg. suspension of counterweights).1.0Small Impact Frequent start, stop, load fluctuation and reversing (eg. fork lift). 1.3Heavy ImpactHeavy and rapid start, stop and load fluctuations are required.(eg. Mining machinery and construction machines).1.5Table 2Safety factorType of Leaf ChainMaximum Number of Reciprocations/StrokesPlate Lacing2x2, 2x3, 3x4,4x4Safety FactorPlate Lacing4x6, 6x6AL Typeless than 10 times per day 8 9less than 100 times per day 11 12BL Type less than 1,000 times per day 8 9A-79