This paper introduces the experimental device used in the research of the jumping-over-teeth in the roller chain drive, describes the differences and the similarities between the jumping-over-teeth at the driving sprocket and at the driven sprocket, analyzes the likelihood of this phenomenon occurring at the driven sprocket, and presents pictures of the two kinds of jumping-over-teeth and the curve diagram of the chain link tension during the experiment. In addition, the paper also provides the formula of the ultimate service load for the roller chain drive without jumping-over-teeth.

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