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Title:
SLIDING STRUCTURE FOR INTERNAL COMBUSTION ENGINE, METHOD FOR CONTROLLING IDLING OPERATION AND METHOD FOR CONTROLLING OPERATION OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2017/209135
Kind Code:
A1
Abstract:
In relation to a sliding structure for an internal combustion engine according to the invention, a cylinder is formed to have a plurality of recesses in a stroke center region, a piston ring is formed to have an inclined surface formed at the outer peripheral surface thereof, and lubricating oil flows into the gap between the inner wall surface and the outer peripheral surface, which move relatively via the inclined surface, so that fluid lubrication can be implemented, and moreover, at any number of revolutions equal to or higher than the number of revolutions in the idling operation of the internal combustion engine, the friction coefficient in the location of the stroke center region where the piston ring passes at the maximum speed (hereinafter as the "central friction coefficient") is set to be smaller than a central friction coefficient which is based on assuming a state in which no recess is formed in the stroke center region, while at the same number of revolutions, a friction coefficient when the piston ring passes any location of the region outside the stroke center region (hereinafter as the "outside friction coefficient") is set to be smaller than the outside friction coefficient in a state in which a plurality of recesses are formed in the outside region. Consequently, higher fuel efficiency can be achieved in relation to the dimple liner technique.

Inventors:
URABE Mitsuru (5-12-10, Honmachi-Higashi, Chuo-ku, Saitama Cit, Saitama 03, 〒3388503, JP)
MURATA Hirokazu (5-12-10, Honmachi-Higashi, Chuo-ku, Saitama Cit, Saitama 03, 〒3388503, JP)
KANNO Kazuhiko (5-12-10, Honmachi-Higashi, Chuo-ku, Saitama Cit, Saitama 03, 〒3388503, JP)
TASE Juta (5-12-10, Honmachi-Higashi, Chuo-ku, Saitama Cit, Saitama 03, 〒3388503, JP)
MOROI Kazumi (5-12-10, Honmachi-Higashi, Chuo-ku, Saitama Cit, Saitama 03, 〒3388503, JP)
Application Number:
JP2017/020128
Publication Date:
December 07, 2017
Filing Date:
May 30, 2017
Export Citation:
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Assignee:
NIPPON PISTON RING CO., LTD. (5-12-10, Honmachi-Higashi Chuo-ku, Saitama Cit, Saitama 03, 〒3388503, JP)
International Classes:
F02F1/20; F01M1/06; F02F1/00; F02F5/00; F16J9/06; F16J9/20; F16J9/26; F16J10/00
Foreign References:
JP5155924B22013-03-06
JP2011075065A2011-04-14
US20140182540A12014-07-03
JP2000129492A2000-05-09
JP2007132247A2007-05-31
JP2010138711A2010-06-24
JP5155924B22013-03-06
Attorney, Agent or Firm:
SAHARA Masashi et al. (SIGHT PATENT, 5th Floor Omiyamiki Bldg., 9-18, Sakuragicho 1-chome, Omiya-ku, Saitama-sh, Saitama 54, 〒3300854, JP)
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