SPINDLE STRUCTURE INCLUDING THROUGH HOLE FOR FLOWING FLUID, ELECTRIC MOTOR, AND MACHINE TOOL

摘要

PROBLEM TO BE SOLVED: To provide a technology that facilitates fluid flow in a through hole in a rotor.SOLUTION: A spindle structure 10 includes a rotatable rotary part 72. The rotary part 72 has: a tool holding part 54a provided at one axial end of the rotary part 72; and through holes 28 and 58 penetrating through the rotary part 72 and opening at the one axial end. The spindle structure 10 includes blades provided in the through holes 28, 58. The blades rotate with the rotary part 72 to flow a fluid existing in the through holes 28, 58 to the one axial end when the rotary part 72 rotates.SELECTED DRAWING: Figure 1