| 摘要 |
Noise and vibration of a helically-toothed-belt transmission device driven under heavy load or at a high-speed rotation, are reduced. A backlash "D" is selectively enlarged in a helically-toothed-belt transmission device that transmits drive force by meshing between a helically toothed belt and a helically toothed pulley. That is, a tooth helix angle ".theta." is set in a range of -0.2 .ltoreq. 1- W .cndot. tan.theta. / Pt .ltoreq. 0.75, with "Pt" being a tooth pitch, ".theta." a tooth helix angle, and W the width of the belt. The backlash "D" between the helically toothed belt and the helically toothed pulley is set to be 1.6%-3% of the tooth pitch "Pt".
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