Invention Grant
- Patent Title: Hollow shaft
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Application No.: US17430859Application Date: 2020-03-19
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Publication No.: US12083571B2Publication Date: 2024-09-10
- Inventor: Shinichi Murata
- Applicant: MUSASHI SEIMITSU INDUSTRY CO., LTD.
- Applicant Address: JP Toyohashi
- Assignee: Musashi Seimitsu Industry Co., Ltd.
- Current Assignee: Musashi Seimitsu Industry Co., Ltd.
- Current Assignee Address: JP Alchi
- Agency: Carrier, Shende & Associates P.C.
- Agent Joseph P. Carrier; Jeffrey T. Gedeon
- Priority: JP 19052861 2019.03.20
- International Application: PCT/JP2020/012347 2020.03.19
- International Announcement: WO2020/189763A 2020.09.24
- Date entered country: 2021-08-13
- Main IPC: B21C37/16
- IPC: B21C37/16 ; B21C37/00 ; B21D41/04 ; B21D51/10 ; F16C3/00 ; F16C3/02 ; F16L9/02

Abstract:
A hollow shaft includes a cylindrical main body part and an extremity drawn part that is integrally connected to one end of the main body part on the same axis and whose diameter is made smaller than a diameter of the main body part by drawing processing, wherein an inner peripheral face of the main body part and an inner peripheral face of a base portion, which is continuous with one end side of the main body part, of the extremity drawn part are formed as cut faces that are subjected to cutting processing before the drawing processing, and an inner peripheral face of a tip portion, which is continuous with an extremity side of the base portion, of the extremity drawn part is a non-cut face. Accordingly, the hollow shaft can be molded with high shape precision while maintaining a low drawing ratio for an extremity drawn part.
Public/Granted literature
- US20220143664A1 HOLLOW SHAFT Public/Granted day:2022-05-12
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