| 摘要 |
<p>A rotary electric tool in which a differential gear mechanism (B) is mounted within a gear case (3) fixed to a housing (1) for example; projections (15) are formed on the outer peripheral surface of an internal gear (13) of a final planetary gear mechanism (B2) in the differential gear mechanism (B), the said projections (15) being brought into engagement with a projection-formed surface of a torque adjusting cam (16); the internal gear (13) and the torque adjusting cam (16) can be changed in relative position axially by reaction force of the internal gear (13); and the rotation of an output shaft (14) is changed over between high and low speed conditions according to an axial displacement of the internal gear (13).</p> |
