| 摘要 |
PROBLEM TO BE SOLVED: To provide a silent chain driving mechanism where power is transmitted between sprockets having different number of teeth, that is improved in reduction in oscillation and noises by suppressing cordial action of silent chains of both the sprocket having much number of teeth and the sprocket having less number of teeth, also improved in driving performance and durability by suppressing fluctuation of chain tensile sgrength. SOLUTION: An inner side flank tooth surface of a silent chain is expanded compared to an outer side flank tooth surface by amplitude of polygonal movement. Shape of teeth surfaces of a camshaft side sprocket and a crankshaft side sprocket are formed of involute curves which satisfy the formula A1>Ac>=A2, where A1 denotes a pressure angle of the camshaft side sprocket, A2 denotes a pressure angle of the crankshaft side sprocket, Ac denotes a pressure angle of the inner side flank. Cordial action on both crankshaft side and camshaft side can thus be suppressed.
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