Abstract
This paper deals with decrease of the noise caused the chain drive using new sprocket wheel with slits. A characteristic of frequency and main causes of the noise are investigated from the noise of the chain drive. The natural frequency of each element of the chain drive is calculated by using NASTRAN for windows which is finite element method software. The analysis results are compared with the noise experimental results and the impulse response experimental results. The relation between the frequency result of the noise experiment and the natural frequencies of each element of the chain drive became clear. From these results, it is important to decrease the sprocket wheel noise for the chain noise. The new sprocket wheel which put in the slits is proposed. The measurements of the slit put into a sprocket wheel are determined using the stress analysis of NASTRAN. The decreasing of the noise of the chain drive by using the new sprocket wheel with slits is tried. The sprocket wheel with slits succeeded in decreasing the noise by the elastic deformation of the tooth of the sprocket wheel.
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