Patent ID: 7407460

Claim:
A switchable planetary gearbox for a hand-held power tool, the planetary gearbox comprising: a planetary carrier; a rotatable sleeve having a sun wheel toothing and arranged centrally on an end face of the planetary carrier, wherein the rotatable sleeve comprises a radial section having an outer circumferential toothing; planet wheels resting against the end face of the planetary carrier and permanently meshing with the sun wheel toothing of the rotatable sleeve, wherein the radial section of the rotatable sleeve is arranged on a side of the planet wheels facing away from the planetary carrier and projects radially past the planet wheels, wherein the radial section is positioned directly adjacent to the planet wheels and the radial section and the planet wheels delimit a gap; a switching ring gear surrounding the planet wheels and having an inner circumferential toothing permanently meshing with the planet wheels, wherein the switching ring gear is axially moveable on the planet wheels from a first end position into a second end position for switching a transmission stage of the planetary gearbox, wherein in the second end position the switching ring gear engages the outer circumferential toothing of the radial section; a synchronization disk positioned in the gap delimited by the planet wheels and the radial section, wherein the synchronization disk is connected to the rotatable sleeve so as to rotate with the rotatable sleeve; wherein the synchronization disk acts directly or indirectly by friction on the switching ring gear when the switching ring gear is moved from the first end position into the second end position; and wherein the synchronization disk has an outer circumference provided with several displaceable contact sections.