| 摘要 |
PURPOSE:To restrict a degree of resonance, by interposing an intermediate toothed pulley between a driving pulley and a driven pulley, the pulley having teeth of which tip configuration is not circular and having tooth tip portions at the minimum distance from the center of the pulley and tooth tip portions at the maximum distance thereform. CONSTITUTION:An oil pump pulley 4 having non-circular tooth-tips is interposed between a cam shaft pulley 1 and a crank shaft pulley 2. The oil pump pulley 4 is so disposed that an end E or F of a short diameter portion E-F thereof is located at a position where it is meshed with a belt 3 when tension of the belt 3 is maximized and an end C or D of a long diameter portion C-D thereof is at a position where it is meshed with the belt 3 when tension of the belt 3 is minimized. With the arrangement, since an amplitude of change in tension of an overall belt 3 is made smaller, a degree of resonance can be restricted.
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