Roller Chain - Tsubaki

Roller ChainInstallation & Maintenance8.2 Link Plate RelatedProblemBreakage of link plate.Possible CausesExcessively large shock load.SolutionReduce shock loads by making the start-up, stopping, andother actions smoother (installing a shock absorber, etc.).Increase the size or number of chains.Drive ChainVibrations in the chain.Large inertia in the driven machine(excessive load).Install an anti-vibration device (for example, tensioner oridler). Refer to “Excessive vibration in chain” page (foundearlier in this section).Increase the size or number of chains.Corrosion.Replace with a new chain. Install a casing to protect thechain. Periodically clean the chain.(1) Static fracture.Stretching the link plate witha tensile load beyond itsbreaking load will cause it tostretch and then break.(2) Fatigue fracture.By repeatedly applying aload past its fatigue limit(fatigue strength), thefatigue will start at holesand then suddenly break.(3) Offset link plate fatigue.Offset link plates are bent atthe center, and the resultingconcentration of stress at thebend can cause a fatiguebreak. Avoid using offset linksin high-stress applications.Cracks in the linkplates (fatigue), whichare perpendicular tothe direction of pull.Loads are greater than the maximumallowable load. And this excessive loadis repeating.Remove all large loads. If it is not possible to remove theexcess load, then increase the size or number of chains.Replace with a new chain.Deformation of link plateholes.Excessive load.Remove excessive load. Replace with a new chain.Corrosion stress cracksappear, usually as bowshapedcracks in thelink plate.The chain is being used in corrosive(acidic or alkaline) conditions. (This isnot caused by a repetitive load).• Replace with a new chain. Install a casing to protect thechain from the corrosive conditions.• Or use an anti-corrosive chain. (See anti-corrosive rollerchain section in this catalogue).A-120