| Summary: | The methods of calculating the location radii of the gear chain pivot locus on the wraps of involute sprockets are suggested. The methods involve a step - by - step “placing” of the chain loops on the sprocket. To determine the chain joints location, surface equidistance of the operating and back tooth profiles which represent the c hain pivot locus upon their contact with the sprocket tooth profiles is used. The location radii of the pivot locus o n the involute sprocket wrap can be defined through the predete r mined position of the first joint, the known length values of the gear chain contact link pitches, and the slack side pretension. The study results allow presenting t he methods of calculating t he gear chain pivot l o cus on the wraps of involute sprockets and the mathematical model algorithm of the chain gearing with involute sprockets. The methods can be used to determine setting of the chain belt with toothed chain providing the minimal we ar - out of the gearing elements.
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