Patent ID: 9410590
Filing Date: 2016-08-09
CPC Classification: B60T,F16D,H02K

Claim Text:
1. An actuator assembly for an electromechanical parking brake comprising; a casing of a motor and a gear housing of a planetary gear set are parallelly coupled to a lower surface of an inner housing; a reduction gear train having a pinion gear and a drive gear for transmitting a power from a rotary shaft of the motor to the planetary gear set is received in an upper surface of the inner housing; and an inner cap covering the outer portion of the reduction gear train is coupled to the upper surface of the inner housing, thereby configuring a primary module which is a single small independent assembly in which the motor, the reduction gear train, the planetary gear set, the inner housing and the inner cap are comprised, wherein the primary module is inserted into an outer housing while keeping a gap at a circumference thereof, an outer cap is coupled to an upper portion of the outer housing to cover the primary module, and the primary module is surrounded by the outer housing and the outer cap, thereby configuring a final module which is a single large independent assembly in which inner components of the motor, the reduction gear train and the planetary gear set are surrounded doubly, and wherein a final output shaft of the planetary gear set is exposed from a lower through hole of the outer housing and connected to a parking brake, wherein the outer housing comprises a bottom portion on which the lower surface of the inner housing is placed; a circumferential wall extending upwards at a circumference of the bottom portion to hide a side of the primary module; wherein a vibration-attenuating damper member is installed in a space between a rim portion of the inner housing and the circumferential wall of the outer housing; wherein the damper member has a coupling groove formed in a circumferential inner wall thereof; the rim portion of the inner housing is fit into the coupling groove; wherein the damper member is assembled below the primary module to face upwards; a bottom portion is formed at a lower end of the rim portion to closely adhere to the lower surface of the inner housing; and openings are formed in the bottom portion to allow the casing of the motor and the gear housing of the planetary gear set to pass through.