DENTAL DRILLING DEVICE HAVING PASSIVE AIR CURTAIN SPINDLE

1 . A dental drilling device comprising:

a spindle including a spindle shaft rotatably mounted inside a drilling device housing and a spindle shaft fan formed in a wing shape on an outer surface of the spindle shaft;

a fixing socket fixedly mounted to one end of the drilling device housing and surrounding one end of the spindle at a predetermined interval;

a processing drill mounted on a front end of the spindle to process a workpiece; and

a driving motor coupled to the other end of the spindle to rotate the spindle.

2 . The drilling device according to claim 1 , wherein the spindle shaft fan rotates air to generate a flow of air discharged into a gap between the spindle and the fixing socket.

3 . The drilling device according to claim 1 , wherein the drilling device housing is equipped with one or more bearings rotatably supporting the spindle shaft and a bearing housing to which the bearings are mounted.

4 . The drilling device according to claim 3 , wherein the drilling device housing is formed with an air inlet supplying air to an outer circumference of the bearing housing.

5 . The drilling device according to claim 3 , wherein a spiral thread is further formed on an outer circumference of the bearing housing to form an air movement passage through which air moves.

6 . The drilling device according to claim 5 , wherein when air moves along the thread formed on an outer surface of the bearing housing, the bearing is cooled by the air due to an air cooling effect.

7 . The drilling device according to claim 1 , wherein an oblique groove is formed inside the fixing socket.

8 . The drilling device according to claim 7 , wherein the oblique groove has a thread shape to be directed in an opposite direction to the spindle shaft fan.

9 . The drilling device according to claim 1 , wherein a separate electrically driven air supply device is not included.