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Title:
ROLLED THREAD, AND METHOD FOR MANUFACTURING ROLLED THREAD
Document Type and Number:
WIPO Patent Application WO/2021/049430
Kind Code:
A1
Abstract:
This rolled thread is provided with a thread portion in which thread ridges and thread grooves are arranged alternately in an axial direction on an outer circumferential portion, and a columnar portion adjacent to the thread portion on at least one of both sides thereof in the axial direction, wherein an axial direction end surface of the columnar portion has provided therein: a first recessed surface which is recessed in the axial direction; a second recessed surface which is positioned on the outer circumferential side of the first recessed surface and which is recessed in the axial direction; and a projecting portion which is positioned in a boundary part of the first recessed surface and the second recessed surface, projects further than the bottom of the first recessed surface and the bottom of the second recessed surface, and extends in an arc shape in the circumferential direction as seen from the axial direction.

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Inventors:
SAITO TAKESHI (JP)
Application Number:
PCT/JP2020/033566
Publication Date:
March 18, 2021
Filing Date:
September 04, 2020
Export Citation:
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Assignee:
NSK LTD (JP)
International Classes:
B21H3/02; B21H3/04; F16B35/00
Foreign References:
JP2005074509A2005-03-24
JP2009233705A2009-10-15
JP2005121216A2005-05-12
JP2005299706A2005-10-27
JP2009233705A2009-10-15
JP2005074509A2005-03-24
Other References:
See also references of EP 4029625A4
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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