Electromagnetic brake system

1. An electromagnetic brake system comprising:

a brake disc configured to be rotated together with a drive shaft of a drive motor configured to operate a vehicle wheel;

an armature disc configured to be movable so as to be in close contact with or so as to be separated from one side of the brake disc;

an elastic member configured to elastically press the armature disc to the one side of the brake disc to a direction in which the armature disc is in close contact with the brake disc; and

an inductor configured to separate the armature disc from the brake disc by an electrical signal,

wherein the brake disc comprises

a tube portion mounted on the drive shaft, and a plate portion provided to extend in an outward direction of the tube portion to be opposite to the armature disc;

wherein the tube portion and the plate portion are provided as a single member in which the tube portion and the plate portion are integrally formed with each other, and

wherein the brake disc comprises a first lining provided on the other side of the plate portion, and a second lining provided on one side of the plate portion and an outer circumferential surface of the tube portion.

2. The electromagnetic brake system of claim 1 , wherein

the other side of the brake disc is directly opposite to an outward surface of the drive motor.

3. The electromagnetic brake system of claim 2 , further comprising:

a spacer provided to maintain a gap between the outward surface of the drive motor and an inward surface of the inductor.

4. The electromagnetic brake system of claim 3 , wherein

the spacer is interposed between the outward surface of the drive motor and the inward surface of the inductor and provided to pass through the armature disc.

5. The electromagnetic brake system of claim 4 , wherein

the spacer is provided in such a way that a plurality of spacers is arranged at equal intervals from each other.

6. The electromagnetic brake system of claim 3 , further comprising:

a fastening member provided to mount the spacer to the inductor.

7. The electromagnetic brake system of claim 2 , wherein

the tube portion is provided in a hollow ring shape to allow the drive shaft to be seated therein,

wherein an outer circumferential surface of the drive shaft is spline-coupled to an inner circumferential surface of the tube portion.

8. The electromagnetic brake system of claim 2 , wherein

the inductor is provided with a receiving portion in which the drive shaft and the tube portion are received.

9. The electromagnetic brake system of claim 8 , wherein

the armature disc is provided with a through hole formed to pass through the armature disc in an axial direction to allow the drive shaft and the tube portion to be received therein.

10. The electromagnetic brake system of claim 9 , wherein

the armature disc is provided in the shape of a disc and configured to be movable in the axial direction along the outer circumferential surface of the tube portion.

11. The electromagnetic brake system claim 2 , wherein

in response to that the armature disc is in close contact with the one side of the brake disc by the elastic member or in response to braking a vehicle, the other side of the brake disc is in close contact with the outward surface of the drive motor.

12. The electromagnetic brake system of claim 2 , wherein

a receiving groove in a concave shape is provided on the inward surface of the inductor,

wherein the elastic member is provided in such a way that at least one portion of the elastic member is inserted into the receiving groove.

13. The electromagnetic brake system of claim 12 , wherein

the armature disc comprises a guide protrusion provided to protrude along the axial direction and insertable into the receiving groove.