DRIVE CHAINS - Tsubaki

Selecting a Roller Chain11. Temperature selection method11.1 RS Roller Chain temperature selection methodThis selection method is for sizes that may experience strength degradation from temperature.Additionally, lubrication shoud be carried out using a suitable lubricant according to the operating temperatures.1) Problems with roller chain transmission at high temperatures 2) Problems with roller chain transmission at low temperatures Increased wear due to hardness reduction Reduction of impact strength due to low temperature brittleness Increased elongation due to softening Solidification of lubricant Poor articulation and increased wear due to oil degradation and carburization Poor articutation due to frost and ice adhesion Increased wear and poor articulation due to scalingTable 7 Maximum allowable load of RS Roller Chain at high and low temperaturesRS roller chainTemperatureRS60 or under RS80 or overRS Cold Resistant Chain *Below60Unusable60 50 Catalog Value 1/250 40Unusable2/340 3030 20UnusableCatalog Value 1/4Catalog Value 1/41/3Catalog Value20 101/3 1/2 10 60Catalog Value Catalog Value60150150200Catalog Value3/4Catalog Value3/4Unusable200 2501/2 1/2 Over 250UnusableUnusable11.2 Lambda Chain KF Series Lube Free Drive Chain SelectionUse the kilowatt ratings chart based selection method for selecting lube free drive chains.Corrected kW < kW ratings =Catalog kW ratings Temperature coefficientNote: The chain is usable if the kilowatt ratings are greater than the corrected kW.Note)1. * RS Cold Resistant ChainMade to orderSelect using allowable load selection method2. The ambient temperature is different from thetemperature of the roller chain itself.Multiply the ambient temperature the chain will be used in by the temperature coefficient in Table 2 below to calculate kilowatt ratings.Calculate the temperature coefficient with the maximum usage temperature of the equipment on which the chain will be installed.Table 2: Temperature Coefficient by Ambient Temperature TemperatureRS40 – RS80Room temperature – 150°C Catalog kW rating 1150°C – 200°C Catalog kW rating 3/4200°C – 230°C Catalog kW rating 1/2Note: A double-strand LMC chain only has the maximum allowable load of asingle-strand LMD chain.Always confirm strength when using for power transmission.11.3 Selection method for Stainless Steel Roller Chain (SS and NS specification) at high temperatures (400 or higher)As the temperature of a chain increases, its strength decreases. The usage limit at high temperatures is determined by thetemperature of the chain itself. Consult Tsubaki when using stainless steel chain at ambient temperatures of 400 or higher.However, chain cannot be used at 700 or higher. When a chain is selected using the temperature selection method, thechain speed must be below the maximum speed of the allowable load selection method.Changes and cautions associated with high temperature environments are:1) All clearances need to be abjusted to prevent poor articulation and poor roller rotation due to thermal expansion.2) The chain may break (creep rupture) under low loads as the temperature increases.12. Special selection method for Corrosion Resistant Roller ChainWhen selecting Corrosion Resistant Chain use the allowable load selection method.1) The maximum allowable tension for Corrosion Resistant Chain is low compared to Standard RS Roller Chain. (Excluding NEP.)2) Avoid using offset links when possible.3) Refer to the following page when acid or alkali solutions or chemicals will come in direct contact with the chain.4) Selection formula: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 HandlingMaximum working load applied to the chainServicefactorKsRPMKnNumber of teethfactorKzMaximum allowableload of the chain156