Air-cooled motor

DETAILED DESCRIPTION An object of the invention is therefore to provide an air-cooled motor which solves the problems of the conventional technique and of which a supply section (rotary joint) to a through hole and the periphery of the supply section can be visually observed so that an abnormal state of the supply section (rotary joint), a liquid leakage, or the like can be found early.
The invention is applied to an air-cooled motor having: a motor body in which a through hole is formed in a rotary shaft; a supply section for supplying a fluid to the through hole; a cylindrical member surrounding the supply section; and a cooling fan provided on the side opposite the motor body with respect to the cylindrical member.
As an improvement according to the invention, a window is provided in the cylindrical member so that the supply section can be visually observed.
At least a part of the cylindrical member may be made of a transparent material so that the supply section can be visually observed.
Further, a passage for distributing cooling air toward the cooling fan may be provided in the cylindrical member.
In the case of making at least a part of the cylindrical member of the transparent material, the supply section can be visually observed without providing openings in the cylindrical member.
Thus, the cylindrical member itself can be used as means for assuring a passage of cooling air in a manner similar to the conventional technique.
On the other hand, in the case of providing a passage for distributing cooling air toward the cooling fan in the cylindrical member, even when an opening is formed in the cylindrical member for using it as a "window", there is no worry that the air cooling efficiency of the motor body deteriorates.
Since the number of the openings increases, heat dissipation is promoted.