ACTUATOR ASSEMBLY FOR ELECTRONIC PARKING BRAKE

摘要

The present invention relates to an actuator assembly for an electronic parking brake having a multi-stage planetary gear mechanism. The present invention can provide an actuator assembly for an electronic parking brake, the multi-stage planetary gear mechanism comprising a center pin extending through through-holes of an entire planetary gear mechanism; a housing for supporting one end of the center pin; a plurality of a planetary gear carriers spaced apart from each other on the axial direction of the center pin and each including a through-hole; a plurality of planetary gears inserted into a planetary gear shaft disposed radially around the through-hole on one side of the planetary gear carrier; and a sun gear of the planetary gear mechanism which is engaged with the planetary gear of the next stage on the opposite side of one surface of the planetary gear carrier on which the plurality of planetary gears are disposed so that the planetary gear carrier can rotate, wherein the diameter of the through-hole is larger than the diameter of the center pin.