| 摘要 |
PURPOSE: A rotor blade of an impact wrench is provided to widen an area for pushing the blade with an air groove by forming an air groove on a lateral surface of a blade, thereby increasing an output. CONSTITUTION: A rotor blade(300) of an impact wrench comprises an air groove(310). The air groove is formed in both sides of a blade from a lower side toward an upper side. An exposure of the blade is prevented by the air groove when the blade is projected from a blade groove(31). The air grooves formed in both sides of the blade is formed across each other. Lubricating oil for lubricating the blade is spread on the air groove. |
