Title:
THREE-PIECE OIL RING AND COMBINATION OF THREE-PIECE OIL RING AND PISTON
Document Type and Number:
WIPO Patent Application WO/2007/088847
Kind Code:
A1
Abstract:
A three-piece oil ring in which sealing performance is enhanced and lubricant
consumption is reduced even with low tension and thin width, and occurrence of
sticking is eliminated. A combination of three- piece oil ring and a piston is
also provided. The three-piece oil ring has a spacer expander (10) and two side
rails. The spacer expander (10) has lug portions (13) respectively projecting
in the axial direction in order to press the respective inner circumferences
of first and second side rails on the radial inner side and each having a bevel on
the radial outside, and side rail supporting portions (14) respectively projecting
in the axial direction in order to support the axial end faces of the first and second
side rails at the radial outer position. Lug angle between the bevel (13a) on the
radial outer side of the lug portion and the axis is 10°-20°, and the
ratio 2X/Y between the total distance 2X of respective axially projecting distances
X of the side rail supporting portions and the distance Y between the axial end
faces of both lug portions is in the range of 0.04-0.15.
Inventors:
KARIYA TOMOTAKA (JP)
Application Number:
PCT/JP2007/051484
Publication Date:
August 09, 2007
Filing Date:
January 30, 2007
Export Citation:
Assignee:
NIPPON PISTON RING CO LTD (JP)
KARIYA TOMOTAKA (JP)
KARIYA TOMOTAKA (JP)
International Classes:
F16J9/06; F02F3/00; F02F5/00; F16J1/08
Foreign References:
| JP2005069289A | 2005-03-17 | |||
| JP2003049705A | 2003-02-21 | |||
| JP2000018386A | 2000-01-18 | |||
| JPS6267261A | 1987-03-26 |
Attorney, Agent or Firm:
KITAZAWA, Kazuhiro et al. (No. 31-14 Yushima 2-chom, Bunkyo-ku Tokyo 34, JP)
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