| 摘要 |
<p>A power tool (1), comprising: a casing (3); a motor (21) located inside the casing (3) and having an output shaft providing a rotation output; a planetary gear reduction system comprising a sun gear (45), a planet gear engaged with the output gear of the sun gear (45), an inner gear ring encircling the planet gear and having in an axial direction a first position where the inner gear ring is engaged with both the sun gear and the planet gear and a second position where the inner gear ring is engaged with the planet gear but away from the sun gear. The invention further comprises a moving end gear (77) with which the inner gear ring is engaged at the second position so as to allow the two to circumferentially lock with each other; and an optional rotation stopper which locks the circumferential rotating motion of the moving end gear (77). In the power tool, the arrangement and adjustment of the inner gear ring is simplified by the presence of a moving end gear that cooperates with the inner gear ring.</p> |
