Title:
SLIDING STRUCTURE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2021/066067
Kind Code:
A1
Abstract:
This sliding structure is for an internal engine having a cylinder and a piston, wherein: the cylinder has a plurality of indentations formed in a stroke center region that covers the whole or part of an inner wall surface of the cylinder between a bottom surface position of the ring groove of the lowermost piston ring at top dead center of the piston and a top surface position of the ring groove of the uppermost piston ring at bottom dead center of the piston; and at least part of the surface of this stroke center region that comes into contact with the piston rings is formed in such a manner as to have a central low-roughness region where a contour curve as measured with a probe-type surface roughness tester has an arithmetic mean roughness Ra of 0.140 µm or lower. Consequently, this configuration achieves higher fuel efficiency in relation to the dimple liner technique.
Inventors:
TAMORI HIROYUKI (JP)
ANDO HAJIME (JP)
MOROI KAZUMI (JP)
ANDO HAJIME (JP)
MOROI KAZUMI (JP)
Application Number:
PCT/JP2020/037294
Publication Date:
April 08, 2021
Filing Date:
September 30, 2020
Export Citation:
Assignee:
NIPPON PISTON RING CO LTD (JP)
International Classes:
F02F1/00; F02F1/20; F16J10/04
Domestic Patent References:
| WO2015125832A1 | 2015-08-27 | |||
| WO2017209135A1 | 2017-12-07 |
Foreign References:
| JP2008023596A | 2008-02-07 | |||
| JP2010255846A | 2010-11-11 | |||
| JP5833276B1 | 2015-12-16 |
Attorney, Agent or Firm:
SAHARA Masashi et al. (JP)
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