Portable power tool having a multispeed power tool transmission

摘要

A multi-speed transmission assembly (16) for a rotary power tool. The transmission assembly (16) includes a plurality of transmission stages (302,304,306), with at least two of the transmission stages employing a movable reduction element (360,400) that permits the transmission stage to be operated in an active mode and an inactive mode. The movable reduction elements (360,400) are coupled to a switching mechanism (60) that switches the reduction elements in a predetermined manner to provide at least three-gear reduction or speed ratios.