The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 2024
Filed:
Jan. 31, 2020
Nippon Piston Ring Co., Ltd., Saitama, JP;
Masahiro Uchiumi, Saitama, JP;
Kenji Arai, Saitama, JP;
Kazuhiro Sameshima, Saitama, JP;
Makoto Kajiwara, Saitama, JP;
Hajime Ando, Saitama, JP;
NIPPON PISTON RING CO., LTD., Saitama, JP;
Abstract
Provided is a combined oil ring that can provide reduction in oil consumption of the engine oil without degrading the oil sealing performance between the lower surface of the side rail and the lower surface of the oil ring groove even when the tension of the combined oil ring is reduced. The combined oil ring includes: a pair of upper and lower side rails fitted in an oil ring groove of a piston, the side rails each being formed in a planar and annular shape and having a sliding contact portion in sliding contact with a cylinder; and a spacer expander disposed between the pair of upper and lower side rails and having a seating tab portion, the seating tab portion including an upper seating tab portion and a lower seating tab portion for pressing the side rails outward, wherein, each in the pair of upper and lower side rails has, in a sectional shape of the sliding contact portion taken along an axial direction of the piston, an outermost diameter portion located below a center of an axial direction width of the side rail, and the combined oil ring includes an anti-tilt device at positions where the upper seating tab and the lower seating tab portion come into contact with inner peripheral sides of the side rails.