Patent ID: 7849976

Claim:
An electro-mechanical brake for a wheel, comprising a motor, a linearly movable member driven by the motor to move linearly, a rotary member connected to the wheel to rotate with the wheel, a frictional member operatively connected to the linearly movable member to be moved linearly by the linearly movable member to press the frictional member against the rotary member and generate a braking force for the wheel, a detector for measuring a position of the linearly movable member, an elastic member which is operatively arranged between the linearly movable member and the frictional member to bias the frictional member away from the linearly movable member; said elastic member bears at least a part of a compressive force for pressing the frictional member against the rotary member, and a switch arranged parallel to the elastic member and configured to output a signal, when the switch detects at least one of that a distance between the linearly movable member and the frictional member becoming equal to a predetermined distance and that the distance between the linearly movable member and the frictional member becoming different from the predetermined distance, and the switch bears another part of the compressive force so that the another part of the compressive force is transmitted between the linearly movable member and the frictional member through the switch.