PROBLEM TO BE SOLVED: To provide a driving shaft attenuating vibration generated by the rotation of an engine and transmitted to a handle from the driving shaft through an operation rod in a bush cutter.SOLUTION: A driving shaft supported as capable of rotating by a plurality of bushes arranged at optional intervals in a pipe-like operation rod and transmitting the rotation of an engine to a cutting blade is provided with that the driving shaft is constituted by a first shaft rotated by the engine, a second shaft for rotating the cutting blade and a third shaft linking the first shaft with the second shaft as one unit, the first shaft and second shaft are made from a metal, the third shaft is made from a FRP, the third shaft has a hollow form, the first shaft and second shaft are made as one unit with the third shaft by inserting and fixing each of the end parts of the first shaft and second shaft into the inside hollow part of the third shaft, and the third shaft links the first shaft and second shaft in the operation rod from the engine side to the first bush.COPYRIGHT: (C)2013,JPO&INPIT【課題】刈払機における、原動機の回転により発生し、駆動軸から操作杆を介してハンドルに伝わる振動を減衰させる駆動軸の提供。【解決手段】パイプ状の操作稈内に、任意の間隔で配置された複数のブッシュにより回転可能に支持され、原動機の回転を刈刃に伝動するための、駆動軸であって、駆動軸は、原動機により回転される第1軸、刈刃を回転させるための第2軸、および第1軸と第2軸とを一体に連結する第3軸とから構成され、第1軸と第2軸は金属製、第3軸はFRP製であり、第3軸は、中空形状をしており、第1軸および第2軸のそれぞれの端部が第3軸の中空内部に挿入固定されて、第1軸および第2軸は第3軸と一体化されており、第3軸は、原動機側から第1のブッシュまでの操作稈内において、第1軸と第2軸とを連結している刈払機の駆動軸。【選択図】図4
