| 摘要 |
<p>A power nutrunner comprising two consecutive planetary reduction gearings (12) and a torque limiting release clutch (13) disposed between a common ring gear (25) of the reduction gearings (12) and the tool housing (11), wherein the ring gear (25) is tubular in shape and has an outer annular shoulder (41) at its one end carrying cam teeth (42) for cooperation with a spring biased thrust element (45) via balls (43) and cam surfaces (44). The thrust element (45) encircles the ring gear (25) and is rotationally locked relative to the housing (11) via a ball spline connection (47-49).</p> |
