| 摘要 |
PURPOSE:To prevent temp. rise of members by allowing external air to flow into the weight accommodation space, and by cooling the weight and movable pulley plate. CONSTITUTION:The weight accommodation space S is put in communication to outside through a gap g provided between the periphery of a cam member 9 and the internal edge of a movable pulley plate 6b, and thereby external air is introduced into the weight accommodation space S. This enables direct contact of external air the the weight 8 and the back face of the movable pulley plate 6b, and thereby the heat can be conducted to the external air for cooling. Because the heat of V-belt 7 is conducted to the cooled pulley plate 6b, the V-belt 7 is cooled at the same time. Accordingly such members as weight 8 and V-belt 7 are prevented from bearing high temperature. |
