| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved technology relating to measures for releasing a pressure of air in a housing and preventing a lubricant from flowing out.SOLUTION: A screwdriver 100 having a motor 110 and a driving mechanism 120 is formed. A lubricant of the driving mechanism 120 is housed in a front housing 104 with the driving mechanism 120 in a sealed manner. The front housing 104 is in communication with an exterior part through a ventilation passage 190. Further, an oil filter 195 is provided at the ventilation passage 190 and captures the lubricant which has passed through the ventilation passage 190.SELECTED DRAWING: Figure 22 |
