| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission enabling quick operation, and to provide a power tool including the transmission.SOLUTION: A reduction gear ratio of a power transmission part 17 is changeable by two stages or more. A solenoid 23 changes the reduction gear ratio by at least one stage while the power transmission part 17 continuously transmits a rotation power to an output side. A gear change ratio before and after the solenoid 23 changes the reduction gear ratio is smaller than 2.5. |
