モーメントを考慮したブレードのアンバランス化によるエンジン式芝刈機の振動低減

抄録

Lawnmower is popular machine to cut grass and trimming gardens. This machine is generally driven by engine, hence lawnmower sometimes makes large vibration and has a possibility to make vibration syndrome. Thus, the vibration reduction of the handle is very important. In this study, we aimed a handle vibration reduction of a lawnmower by unbalancing a blade considering the contribution of engine vibration to the handle and the moment. Through a contribution analysis, the large engine up-down vibration was found to be the main contributor of the handle vibration, and the engine vibration was excited by the pitching moment of the blade cover. Accordingly, we attempted to reduce the pitching moment to decrease the high contribution engine up-down vibration by the blade unbalancing. As the result, the engine vibration along up-down direction could be reduce largely by adding a small weight on the blade tip. In addition the handle vibration of the lawnmower was also reduced very well by the reduction of the high contributing engine up-down vibration.