DRIVE CHAINS - Tsubaki

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Before Use For Safe UseStandard Roller Chains Lube-Free Roller Chains Heavy Duty Roller Chains Corrosion Resistant Roller Chains Specialty Roller Chains Accessories Selection Handling8. Cautions on Use in Special EnvironmentsAs a general rule, roller chain should be used in a clean air flow; however, when used in a specialatmosphere, reference should be made to the various items that follow.8.1 Use in wet conditionsIf the chain is used in a sterilizing machine or water screen, for example, where the chain is splashed withwater or goes through heated vapor, the following problems may occur.1) An increase in abrasive stretch due to improper or insufficient lubrication.2) Decrease in fatigue strength from rust and corrosion (pitting) of the chain.1) Countermeasures(1) Reduce bearing pressure using a larger sized chain to improve wear resistance.(2) Use corrosion resistant roller chain for rust prevention.8.2 Use in acidic or alkaline conditionsIf roller chain is exposed to acids or alkaline conditions, such as battery acid and liquid used in platingprocesses, the following problems may occur.1) Embrittlement fracture of link plates and pins.2) Fatigue breakage of link plates and pins due to rust and pitting corrosion.3) Wear from usual mechanical abrasion and corrosion.4) Reduction in volume of the whole chain from corrosion.5) In special cases where the chain is underwater (immersed in liquid),electrochemical corrosion may occur.6) There are also circumstances where even stainless steel roller chain willcorrode. Fig. 31 shows an example of chain that was used in a platingapparatus. The chain fell to pieces within one month due to the affect ofthe acid.Fig. 31 Corrosion of stainless steel roller chain1) Countermeasures for embrittlement fractures (Stress corrosion cracking) Adopt a brittleness countermeasure that lowers crack susceptibility. Install a cover or casing to prevent acids or alkalis from contacting the chain. Adopt a high-grade material with anti-corrosive properties.2) Countermeasures for corrosion Use surface-treated chain. Install a cover or casing to prevent acids or alkalis from contacting the chain. Adopt a high-grade material with anti-corrosive properties.In general, embrittlement fractures (stress corrosion cracking) occur aroundthe link plate holes. This is the area where the pin and bush are press-fitted Fig. 32. Hydrogen embrittlement crackingto the link plate having the highest concentration of stress. Cracks aregenerated even when there is no tension on the chain. Roller chain ingeneral is more susceptible to acids than alkalis, and in special cases,embrittlement fractures (stress corrosion cracking) are generated byseawater or pit water.8.3 Use under conditions where abrasion is a problemIf the chain is exposed to strong abrasive materials that promote wear such as sand, coke and metalparticles, the following problems may occur:1) When abrasive materials penetrate between the pins and bushes, chain wear is promoted and poor articulationoccurs.2) When abrasive materials penetrate between the bushes and rollers, chain wear is promoted and poor rollerrotation occurs.3) When the abrasive materials penetrate between the link plates, poor articulation occurs.1) CountermeasuresApply a dust-protection casing.Remove foreign particles by regularly washing the roller chain.Reduce bearing pressure using a larger sized chain to improve wear resistance.Increase abrasion resistance by applying special processing to the parts of the chain where abrasion is aproblem.169
Handling of roller chain and sprocket9. Roller Chain Drive Troubleshooting and Problem-SolvingWhen there is significant damage and breakage with regard to the roller chain and sprockets, pleasecarry out the following remedies and replace with new chain and sprockets.9.1 GeneralSymptom Possible Causes RemedyChain is riding upon the sprocket.Unusual noises.Excessive vibrationsin chain.The roller chain and sprocket do notmatch.Excessive load.Elongation of the chain due to wearor excessively worn sprocket teeth.Improper installation of the sprocket orshaft.Chain casing or bearings are loose.Excessive or insufficient slack in thechain.Excessively worn chain or sprocket.Lack of or unsuitable lubrication.Chain is resonating with periodicexternal force.Load fluctuations are excessively large.Span between shafts is too large.Replace the chain or sprocket with the correct size.Decrease the load, or increase the number of strands or sizeof the chain.Replace with new chain and sprockets.Inspect and correct.Tighten all bolts and nuts.Adjust the distance between shafts to obtain the properamount of slack.Replace the chain and sprocket with new chain andsprocket.Provide proper lubrication according to the operating conditions.Change the chain's mode of vibration.1. Preventing resonance.a. To change the natural frequency of the chain.Alter the effective tension either by applying an initial tension or adjusting the existing one.Install a tensioner to change the chain span.Replace the chain. Choose a different quality andspring coefficient.b. Change the vibration frequency.Change the speed of rotation of the sprocket.Re-evaluate the device set-up.2. Mechanically reducing the vibrations.Install a guide shoe.Install a self-adjusting tensioner on the slack side.ChainGuideTensionerReduce fluctuations with fluid coupling or similar technique.Install an idler.Before Use For Safe Use Standard Roller Chains Lube-Free Roller Chains Heavy Duty Roller Chains Corrosion Resistant Roller Chains Specialty Roller Chains Accessories Selection HandlingThe chain windsonto the sprocket.(Poor separation fromthe sprocket teeth)Excessive slack in chain.Elongation of the chain due to chainwear or excessively worn sprocket teeth.Adjust the chain length or distance between shafts.Install a tensioner.Replace with new chain and sprocket.170
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Tsubaki: RecognizedProvider forBasi
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RThe Powerful Tsubaki LineBecause i
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ContentsBefore UseNotes on Using Ro
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Before UseT S U B A K I D R I V E C
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GlossaryT S U B A K I D R I V E C H
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T S U B A K I D R I V E C H A I NRo
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T S U B A K I D R I V E C H A I NRo
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Before Use For Safe UseStandard Rol
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T S U B A K I D R I V E C H A I N4.
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"World’s No. 1"kilowatt ratings b
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Standard Roller ChainsOld-New Chain
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Standard Roller ChainsRS25, BF25-H
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Standard Roller ChainsRS35 Sprocket
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Standard Roller ChainsRS100 Sprocke
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Standard Roller Chains RS Roller Ch
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Standard Roller ChainsRF320-T, RF40
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Standard Roller ChainsBS/DIN Standa
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BS/DIN Standard RS Roller ChainsKil
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BS/DIN Standard RS Roller ChainsKil
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Lube-Free Roller ChainsLambda Chain
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Lube-Free Roller ChainsX-Lambda Cha
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Lube-Free Roller ChainsKilowatt Rat
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Lube-Free Roller ChainsHeavy Duty L
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Lube-Free Roller ChainsCurved Lambd
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Lube-Free Roller ChainsKilowatt Rat
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T S U B A K I D R I V E C H A I NHe
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Heavy Duty Roller Chains RS-HT Chai
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Heavy Duty Roller Chains SUPER Roll
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Heavy Duty Roller Chains ULTRA SUPE
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T S U B A K I D R I V E C H A I NBe
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Corrosion Resistant Roller ChainsOl
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Corrosion Resistant Roller Chains S
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Corrosion Resistant Roller Chains S
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Corrosion Resistant Roller ChainsTi
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Corrosion Resistant Roller Chains L
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Corrosion Resistant Roller ChainsLo
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Specialty Roller ChainsLeaf ChainsB
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Specialty Roller ChainsLeaf ChainsB
Page 120 and 121: Specialty Roller ChainsPin Gear Att
Page 122 and 123: Pin Gear SprocketBefore Use For Saf
Page 124 and 125: Before Use For Safe UseStandard Rol
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Page 132 and 133: Roller Chain SelectionBefore Use Fo
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DRIVE CHAINS - Tsubaki

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