Title:
Combination oil ring
Document Type and Number:
Japanese Patent JP6122901
Kind Code:
B2
Abstract:
Provided is a combined oil ring that further reduces engine oil consumption. A combined oil ring attached to an oil ring groove of a piston includes: a pair of upper and lower side rails each formed into a flat annular shape, and having a slide contact part that comes into sliding contact with a cylinder; and a spacer expander arranged between the pair of upper and lower side rails. In at least the upper side rail of the pair of upper and lower side rails, a cross-sectional shape of the slide contact part along an axial direction of the piston is a tapered shape linearly spreading from upper to lower parts of the piston; the tapered shape is at an angle of 5 to 30 degrees with respect to a central axis of the spacer expander, and has a vertex of the tapered shape within 0.15 mm from a lower end of the side rail; and a part closer to the lower end than the vertex is formed into a curved shape having a curvature of R0.01 to 0.5.
Inventors:
River Saki Masataka
Miyamoto Mamoru
Eiji Ichisugi
Arai Kenju
Miyamoto Mamoru
Eiji Ichisugi
Arai Kenju
Application Number:
JP2015085042A
Publication Date:
April 26, 2017
Filing Date:
April 17, 2015
Export Citation:
Assignee:
Nippon Piston Ring Co., Ltd.
International Classes:
F16J9/20; F02F5/00; F16J9/06
Domestic Patent References:
| JP2003049705A | ||||
| JP2002323133A |
Attorney, Agent or Firm:
Patent Business Corporation Intect International Patent Office
Yoshinori Ishibashi
Yoshinori Ishibashi