Lubrication mechanism

Abstract

In a lubrication mechanism including a rotating shaft, the rotating shaft includes an external member and an internal member housed inside the external member, the internal member having an internal space extending in an axial direction, a horizontal hole is formed in the internal member, the horizontal hole for communicating between the internal space and an outer peripheral surface of the internal member, the horizontal hole communicates with a lubrication flow passage for communicating with a prescribed lubrication target portion, and the external member and the internal member are made of materials with a different hardness.

Dependencies are inferred from the claim text.