| 摘要 |
PURPOSE:To improve a balance effect by applying a notch symmetrical on the right and left in the rotating direction from the maximum weight section of a dispersed weight and making the maximum weight section matching the irregular deformation of a diaphragm symmetrical on the right and left of this notch. CONSTITUTION:Only one maximum weight section W shown by a chain line is removed, and two maximum weight sections 12, 12 symmetrical on the right and left on a normally removed weight section W are provided. Therefore, a notch 13 symmetrical on the right and left in the rotating direction from the normal maximum weight section W is applied inward in the radial direction, and the maximum weight sections 12, 12 are constituted symmetrically on the right and left of the recessed circular notch 13. According to this constitution, when a connecting rod 4 is deflected to an angle shown by the figure and rotating resistance is generated on a diaphragm 7, a balance action is generated by one of the maximum weight sections 12, an extremely excellent balance effect is exerted, and vibration can be suppressed.
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