Electromechanical brake

1. An electromechanical brake, comprising:

a power converter including a nut provided in a cylinder portion of a caliper housing slidably coupled to a carrier and configured to rotate by receiving a driving force from an actuator, and a spindle connected to the nut and configured to move forward or backward by rotation of the nut in a first direction or a second direction;

a pressing member coupled to a front side of the spindle and configured to press a pad plate; and

a position adjuster screwed into the cylinder portion so that the power converter is mounted and configured to adjust a relative position of the caliper housing in response to an operation of the power converter.

2. The electromechanical brake of claim 1 , wherein the position adjuster comprises:

a transfer portion provided between the power converter and the cylinder portion;

a first screw thread formed on an outer circumferential surface of the transfer portion;

a second screw thread formed on an inner circumferential surface of the cylinder portion and meshing with the first screw thread; and

an adjuster configured to rotate the transfer portion in the first direction or the second direction by rotation of the nut to move backward or forward a relative position of the caliper housing with respect to the transfer portion.

3. The electromechanical brake of claim 2 , wherein the transfer portion is provided in a hollow cylindrical shape to surround an outer side of the nut to be spaced apart from the nut by a predetermined interval.

4. The electromechanical brake of claim 2 , wherein the adjuster comprises:

a first protrusion protruding from the nut; and

a second protrusion formed to protrude from the transfer portion and configured to move the relative position of the caliper housing backward when the nut rotates in the first direction by being caught by the first protrusion to induce the first direction rotation of the nut and the transfer portion.

5. The electromechanical brake of claim 4 , wherein a first angle between the first protrusion and the second protrusion in a braking release state of a vehicle is greater than a second angle at which the first protrusion rotates from the braking release state of the vehicle to a braking state of a vehicle.

6. The electromechanical brake of claim 4 , wherein the first protrusion is formed to protrude from an outer circumferential surface of the nut to be spaced apart from an inner circumferential surface of the transfer portion, and

the second protrusion is formed to protrude from the inner circumferential surface of the transfer portion to be spaced apart from the outer circumferential surface of the nut.

7. The electromechanical brake of claim 4 , further comprising:

an electronic control unit (ECU) configured to control an operation of the actuator; and

a detector configured to measure fastening force between the pad plate and the disk rotating together with a wheel of a vehicle.

8. The electromechanical brake of claim 1 , wherein the pressing member is press-fitted or bolted to the front side of the spindle in order to move together with the spindle.

9. The electromechanical brake of claim 1 , wherein the pressing member is provided with an anti-rotation means so that rotation thereof is restricted, and

the anti-rotation means comprises:

an anti-rotation groove or protrusion formed in a front of the pressing member facing the pad plate; and

a rotation prevention protrusion or groove formed on a rear side of the pad plate facing the pressing member, the rotation prevention protrusion or groove matching the anti-rotation groove or protrusion.

10. The electromechanical brake of claim 1 , further comprising: a boot provided to prevent an inflow of foreign substances into the cylinder portion of the caliper housing.