PROBLEM TO BE SOLVED: To prevent falling of a cutter blade shaft from a head case, in a bush cutter.SOLUTION: There is provided a structure for preventing falling of a cutter blade shaft in a bush cutter, vertically provided on a head case to be rotatable with upper and lower bearings and preventing falling of a cutter blade shaft transmitted with power from a transmission shaft through a driving side bevel gear and a driven side bevel gear, wherein a recessed portion with a smaller diameter is formed on the cutter blade shaft between the driven side bevel gear and a lower side bearing and a falling prevention pin is inserted into the head case so as to enter the recessed portion.COPYRIGHT: (C)2011,JPO&INPIT【課題】 草刈機において、刈刃軸がヘッドケースから脱落するのを防止する。【解決手段】 ヘッドケースに上下のベアリングで回転可能に縦設され、伝動軸から駆動側ベベルギアと従動側ベベルギアを介して動力を伝達される刈刃軸の脱落防止を図る草刈機の刈刃軸脱落防止構造であり、従動側ベベルギアと下部ベアリングの間の刈刃軸に径小の凹部を設け、ヘッドケースにこの凹部に入り込む脱落防止ピンを刺し通す。【選択図】 図1
