Electromechanical brake and method of operating the same

Abstract

Disclosed is an electromechanical brake and a method of operating the same. In accordance with an aspect of the disclosure the electromechanical brake includes a piston configured to advance and retreat to press a brake pad; a power transmission unit configured to receive a driving force from an actuator to convert a rotational motion into a linear motion, and provide the converted driving force to the piston; and a position adjustment unit configured to adjust a relative position of the piston with respect to the power transmission unit; wherein the power transmission unit includes a spindle rotating by receiving the driving force from the actuator, and a nut connected to the spindle and moving forward or backward an inside of the piston by rotation of the spindle in a first direction or a second direction to advance and retreat the piston, wherein the position adjustment unit includes an adjusting screw provided on an outer side of the nut and rotating together with the nut, a first screw thread formed on an outer circumferential surface of the adjusting screw, a second screw thread formed on an inner circumferential surface of the piston and meshing with the first screw thread, and an adjuster provided between the spindle and the nut, the adjuster configured to rotate the nut and the adjusting screw in the first direction or the second direction by compressing or expanding to its original shape when an rotation amount of the spindle exceeds a predetermined rotation amount, to advance or retreat the relative position of the piston.