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A model of a timing belt analyzed by FEM (a general non-linear finite element program:ABAQUS) successfully confirmed the mechanism that generates belt cord stress. Analysis revealed a good correlation between the experimental and computed results of stress distribution of the belt cord. Through calculation, it was discovered that belts broke near the tooth root, which is the point of maximum stress of the cord.

A timing belt used for an automotive engine's camshaft consists of a facing fabric, elastoeric body and glass fibre cords. These materials show significant non-linear characteristics. Therefore, a model of the timing belt was analyzed using ABAQUS (: a general non-linear finite element program). As a result, the mechanism that generates the belt load distribution was successfully confirmed by calculation. It was found that the pitch difference existing between the timing belt and pulley, and belt tooth configuration both have a large affect on load distribution of toothed belts. This paper reports the development of an analytical model which shows the effects of pitch difference and pulley tooth configuration on belt contact pressure.

A simulation model has been developed to estimate belt load by replacing the L/O (layout) around the engine synchronous drive belt and cam pulley with a simple vibration model based on the spring-mass system. Different engine specifications were applied to compare belt load estimates made by this model with the load actually measured, and found that the estimates matched the measurement values precisely. This report describes the specifications of our simulation model and the results of verification.