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:
Apr. 08, 2008
Filed:
Oct. 28, 2003
Tomoaki Abe, Aichi, JP;
Keishi Nanno, Aichi, JP;
Shiro Shibata, Saitama, JP;
Hideshi Hitosugi, Saitama, JP;
Tomoaki Abe, Aichi, JP;
Keishi Nanno, Aichi, JP;
Shiro Shibata, Saitama, JP;
Hideshi Hitosugi, Saitama, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Nippon Piston Ring Co., Ltd., Saitama-shi, Saitama, JP;
Abstract
It is a main object of the present invention to provide an oil ring which is capable of reducing sliding friction even in a high speed revolution region of a piston, and capable of reducing the consumption of oil. To achieve the object, the present invention provides an oil ring which is formed into cross-section substantially of an I-shape that two rails are connected at a columnar portion thereof, wherein a sliding projection formed in each of the two rails comprises an outer side surface of sliding projection which forms an outer portion of the sliding projection, a inner side surface of sliding projection which forms an inner portion of the sliding projection, and a sliding surface which slides on a cylinder inner wall and forms a tip end of the sliding projection;