Roller Chain - Tsubaki

Roller Chain StructurePin LinkPress FitRoller LinkPress FitSlip FitWidth betweenRoller Link PlatesPinDrive Chain1. Basic StructurePress FitRollerBushingRollerDiameter PitchRoller Link PlateThree Basic DimensionsPitch, Roller Diameter and Widthbetween Roller Link Plates areknown as the “Three BasicDimensions of Roller Chain.”When these three dimensions areidentical, roller chain andsprockets are dimensionallycompatible.* Slip FitWhen the shafts and holes arefitted together, there is acontinuous loose fit. This is a fitwhere the range of tolerance forthe hole is larger than the rangeof tolerance for the shaft (pin orbushing).* Press FitWhen the shafts and holes arefitted together, there is acontinuous interference fit. This isa fit where the range of tolerancefor the hole is smaller than therange of tolerance for the shaft(pin or bushing).A-8Offset PinCotter PinSlip FitSpring clips, cotter pins andspring pins are the parts thatprevent the connecting linkplate from falling off the pin.These parts are critical in orderto maintain the originalstrength of the chain.Connecting Link PlateSpring ClipPin Link PlateSingle StrandPin LinkInner PlateOffset Link Connecting LinkRoller ChainRoller LinkMulti-Strand Pin Link(Two-strand chain shown)• PlateThe plate is the component that bears the tension placed on the chain. Usually this is a repeatedloading, sometimes accompanied by shock. Therefore, the plate must have not only great statictensile strength, but also must hold up to the dynamic forces of load and shock.• PinThe pin is subject to shearing and bending forces transmitted by the plate. At the same time, itforms a load-bearing part, together with the bushing, when the chain flexes during sprocketengagement. Therefore, the pin needs high tensile and shear strength, resistance to bending,and also must have sufficient endurance against shock and wear.• BushingThe bushing is subject to complex forces from all parts, especially from the repetition of shockloads when the chain engages the sprocket. Therefore, the bushing needs extremely high shockresistance. In addition, the bushing forms a load-bearing part together with the pin and as suchrequires great wear resistance.• RollerThe roller is subject to impact load as it strikes the sprocket teeth during the chain engagementwith the sprocket. After engagement, the roller changes its point of contact and balance. It is heldbetween the sprocket teeth and bushing, and moves on the tooth face while receiving acompression load. Therefore, it must be resistant to wear and still have strength against shock,fatigue and compression. RS11 / 15 / 25 / 35 do not have rollers.• Roller LinkTwo bushings are press fit into two roller link plates and rollers are inserted to allow rotationaround the outside of the bushing. This is the same for single strand and multi-strand chain.• Pin Link and Inner PlateThe pin link consists of two pins that have been press fit into two pin link plates. In the case ofmulti-strand roller chain, an inner plate is added to the pin link. The inner plate is slip fit forStandard RS Roller Chain and press fit for SUPER Roller Chain.