Roller-chain Drives Mechanics using Multibody Dynamics Tools

An integrated model for the simulation of roller-chain drives based on a multibody dynamics methodology is presented here in order to describeits complex dynamic behavior. The chain is modeled by masses lumped at the roller locations and connected by translational spring-damper elements in order to take into account the elastic flexibility of the chain and the energy dissipation at the joints.

The driver and driven sprockets are modeled as rigid bodies that can be repositioned during the analysis in order to simulate automatic tensioners or out-of-balanceshafts. The problem of the rollers engagement on the sprockets responsible for the polygonal effect is thoroughly analyzed and the induced impulsive forces developed during that action are treated by a strategy where kinematic constraints between sprockets and rollers are added and deleted.