PROBLEM TO BE SOLVED: To smoothly perform the injection of grease into a gear case by using a tube.SOLUTION: A power machine for a bush cutter is provided with bevel gears 17 and 29 as a gear tool for transmitting rotation of a drive shaft 14 driven by a motor 11 to a rotating shaft 19 for driving the bush cutter extended in the direction to cross the drive shaft 14 a gear case 13 continuously provided at the leading edge of the drive shaft 14 and a screw hole 31 for injecting grease and an air hole 41 formed in the gear case 13 so as to penetrate through the inside and outside thereof. When a screw hole 32 for preventing the outflow of grease is screwed into the screw hole 31 for the injection of grease, a jaw of the screw hole 32 for preventing the outflow of grease covers the air hole 41.COPYRIGHT: (C)2012,JPO&INPIT【課題】チューブによるギヤケース内へのグリースの注入をスムースに行えるようにする。【解決手段】原動機11によって駆動される駆動軸14の回転を、駆動軸14に交差する方向に延設された刈刃駆動用の回転軸19に伝えるギヤ手段としての各ベベルギヤ17、29に、駆動軸14の先端に連設されたギヤケース13と、ギヤケース13にこれの内外に貫通するように形成されたグリース注入用ネジ孔31および空気孔41と、を設けたものとし、グリース注入用ネジ孔31にグリース流出防止用ネジ32をねじ込んだとき、該グリース流出防止用ネジ32の顎部が前記空気孔41を塞ぐ構成である。【選択図】図2
