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:
Jul. 16, 2019
Filed:
Feb. 21, 2017
Kabushiki Kaisha Riken, Chiyoda-ku, Tokyo, JP;
Masaaki Fujita, Kashiwazaki, JP;
KABUSHIKI KAISHA RIKEN, Chiyoda-ku, Tokyo, JP;
Abstract
A piston ring includes an annular body having: an inner circumferential surface and an outer circumferential surface; one side surface and the other side surface substantially orthogonal to the inner circumferential surface; and a pair of joint ends. The outer circumferential surface includes an inclined surface and an abutment surface. In a direction connecting the one side surface and the other side surface, a maximum width Wof the abutment surface at the joint end is 80% to 150% of a maximum width Wof the abutment surface in a portion other than the joint end. In the body, a two-axis difference (d−d) between a diameter din a first axis direction passing through a central position of the joint and a diameter din a second axis direction orthogonal to the first axis direction is greater than −0.25 mm and less than +0.36 mm.