Title:
PISTON AND MARINE INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2023151267
Kind Code:
A
Abstract:
To provide a piston capable of preventing scuffing from occurring to an inner peripheral surface of a cylinder, and provide a marine internal combustion engine.SOLUTION: A piston includes: a piston body reciprocally moving inside a cylinder where a combustion chamber of a marine internal combustion engine is formed; and a plurality of piston-rings which are provided for an outer peripheral part of the piston body so that it is arranged in a reciprocal movement direction of the piston body and is in slide contact with the inner peripheral surface of the cylinder. A lowest stage piston-ring provided on a lowest side of the plurality of piston-rings has an arc-shaped slide surface in slide contact with the inner peripheral surface of the cylinder by making a projecting arc-shape on the inner peripheral surface side of the cylinder. The arc-shaped slide surface is an eccentric surface having an apex below a central position in a vertical direction of the lowest stage piston-ring.SELECTED DRAWING: Figure 3
Inventors:
KINOSHITA YOSHIHIKO
Application Number:
JP2022060786A
Publication Date:
October 16, 2023
Filing Date:
March 31, 2022
Export Citation:
Assignee:
JAPAN ENGINE CORP
International Classes:
F16J9/20; F02F5/00
Attorney, Agent or Firm:
Sakai International Patent Office
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