| 摘要 |
A pneumatic hammer is described comprising a housing (3), a drive motor (9), an output spindle (11) supporting a tool holder (13), a hammer mechanism, a conversion mechanism comprising a rotatable input member coupled to the drive motor (9) and being adapted to convert a rotational movement of the input member into a reciprocating movement of an output member (51) which is coupled with a piston (19), wherein the spindle (11) is coupled with a rotatable drive member coupled with the drive motor (9) so that rotation of the drive member effects rotation of the spindle (11), wherein the input member is formed as a first carrier (33) which supports a first planet gear (35), wherein a first sun gear (37) is coaxially arranged with the first carrier (33), the first sun gear (37) being rotatingly driven by the drive motor (9), wherein a first ring gear (39) is movable parallel to the first axis of rotation (31) between a first position and a second position, wherein the drive member is formed as a second gear (57) rotatable around a second axis of rotation (55) parallel to the first axis of rotation (31), wherein the second gear (57) meshingly engages with the first ring gear (39) when the first ring gear (39) is in the second position, and is disengaged from the first ring gear (39) when the first ring gear (39) is in the first position, wherein the second gear (57) comprises a coupling section connected with the drive motor (9) via a releasable connection which has an open state in which the second gear (57) is not rotatingly driven by the drive motor (9), and a closed state in which the second gear (57) is rotatingly driven by the drive motor (9). |
