Patent ID: 11959516
Assignee: THK CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A hollow shaft member comprising:
paired diameter-reduced sections respectively formed at both shaft ends of a hollow shaft tubular material by performing swaging processing on both the shaft ends; and
an intermediate section located between the paired diameter-reduced sections, and having an outer diameter larger than an outer diameter of the paired diameter-reduced sections, wherein
shapes of connection boundaries between the intermediate section and the diameter-reduced sections are formed as perpendicular step-shaped sections stepped substantially perpendicular to an axial direction, and the perpendicular step-shaped sections include a groove-shaped recess, wherein external dimensions of the perpendicular step-shaped sections are smaller than the external dimensions of the pair of diameter-reduced sections, and a bearing is capable of being installed on the perpendicular step-shaped sections to support the hollow shaft member and the perpendicular step-shaped sections are formed by the swaging processing.