| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a handpiece capable of efficiently cooling heat of a motor.SOLUTION: A handpiece includes: an external housing 3 formed like a bar; a cylindrical core 10 inserted in the inside of the external housing; a cylindrical pipe 20 inserted in an air hole and a water hole of the core, respectively; a rotor 30 inserted in the inside of the core and provided with a transmission shaft formed to extend on both sides of the core; a cylindrical support ring 34 fitted and coupled to both sides of the transmission shaft, respectively; a pair of bearings 36 respectively provided on the front and the rear of the support ring; a coupling 38 coupled to the transmission shaft in front of the rotor; a front housing 40 coupled to the front of the external housing; a front cap 50 provided in the rear of the core and provided with a number of penetration holes 54; a rear cap 60 provided in the rear of the front cap and provided with a number of through holes corresponding to the penetration holes; and a rear housing 70 coupled to the rear of the external housing.</p> |
