| 摘要 |
PURPOSE:To make the device light and small, enhance the drive efficiency, and reduce noises by incorporating a motor in an enclosed solution, introducing air from the end of a rotary shaft through a center hole, allowing the air to flow through the rotation drive part, absorbing heat, and releasing it from the shaft end. CONSTITUTION:Pressure air supplied to an sir sump 12 flows into an air supply shaft hole 10a from the tail of a rotary shaft 4 to intrude into the solution 3 through an air supply hole 11a. It flows through a motor 2 toward an exhaust hole 11b, when the emitted heat under rotation drive will be absorbed, and the air with heat flows into an exhaust shaft hole 10b from the exhaust hole 11b to be exhausted to the outside. The air flowing out may, if necessary, be allowed to jet out from the cutter tip at the foremost part through the shaft hole 15 of a drill 14, and the cutting edge becoming hot during boring may be cooled. Also splash and dust generated in processing may be removed.
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