COMBINATION OF CYLINDER AND PISTON RING

Title:

COMBINATION OF CYLINDER AND PISTON RING

Document Type and Number:

WIPO Patent Application WO/2021/124788

Kind Code:

A1

Abstract:

Provided is a combination of a cylinder and a piston ring with which it is possible, irrespective of the material applied in the inner peripheral surface of the cylinder, to reduce the amount of wear in a hard carbon film forming the outer peripheral surface of the piston ring, in accordance with the degree of hardness of said material. The present disclosure is a combination of a cylinder and a piston ring, said combination comprising a cylinder of an internal combustion engine, and a piston ring that slides against the inner peripheral surface of the cylinder, and said combination being characterized in that: the outer peripheral surface of the piston ring that slides against the inner peripheral surface of the cylinder is formed from an amorphous carbon film containing substantially no hydrogen; the Vickers hardness Hd of the amorphous carbon film and the Vickers hardness Hb of the inner peripheral surface of the cylinder satisfy the relationship Hd+Hb≤2500HV; and the ratio ID/IG, which is a ratio of the peak intensity of a D band to the peak intensity of a G band in a Raman spectrum obtained by measuring the amorphous carbon film by Raman spectroscopy, is 0.60-1.33 (inclusive).

Inventors:

SHINOHARA AKIO (JP)

Application Number:

PCT/JP2020/043244

Publication Date:

June 24, 2021

Filing Date:

November 19, 2020

Export Citation:

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Assignee:

KK RIKEN (JP)

International Classes:

F02F1/00; F02F5/00; F16J9/26

Domestic Patent References:

WO2009069703A1

2009-06-04

Foreign References:

JP6533858B1	2019-06-19
JP2004010923A	2004-01-15
JP2007162099A	2007-06-28

Other References: