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Title:
WIRE MATERIAL FOR PISTON RING AND PISTON RING PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/220549
Kind Code:
A1
Abstract:
Provided is a wire material of which a first side surface for forming an outer peripheral surface of a piston ring includes a tapered surface and a protruding surface. The protruding surface is divided into a first portion and a second portion by a first virtual surface which is an extension of the tapered surface. The first portion includes an apex part and is formed to have a projecting shape.

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Inventors:
NAKAZAWA ATSUSHI (JP)
MINEMURA SATOSHI (JP)
HAMA MASAHIDE (JP)
Application Number:
PCT/JP2020/047139
Publication Date:
November 04, 2021
Filing Date:
December 17, 2020
Export Citation:
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Assignee:
TPR CO LTD (JP)
International Classes:
F02F5/00; F16J9/20; F16J9/26
Foreign References:
US5901963A1999-05-11
JP2016114089A2016-06-23
JP2014035038A2014-02-24
JP2016169791A2016-09-23
JP2009091927A2009-04-30
JP5564082B22014-07-30
Other References:
See also references of EP 3967866A4
Attorney, Agent or Firm:
IP FIRM SHUWA (JP)
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