ABRASION CORROSION PREVENTIVE METHOD FOR KEY COUPLING PORTION, AND KEY COUPLING STRUCTURE

摘要

PURPOSE:To provide a device and a method which prevent the abrasion corrosion of a key coupling portion formed to carry out the connection/joining of two members, a rotary shaft and a rotated body. CONSTITUTION:A lubricant liquid is fed to a key coupling portion between the output shaft 20 of a drive motor 19 and a rotary member 22 through a penetration hole 45 provided at the axis center of the rotary member 22 during the rotation of the drive motor 19, and is circulated through a micro opening between a key surface and an opposition surface to butt/engage against/with the key surface, and is recovered through a space A and a circulation passage 40.