PISTON RING AND MANUFACTURING METHOD THEREOF

Title:

PISTON RING AND MANUFACTURING METHOD THEREOF

Document Type and Number:

WIPO Patent Application WO/2017/022660

Kind Code:

A1

Abstract:

[Problem] A piston ring, and a manufacturing method thereof, having a hard carbon film that is easy to form and that has excellent adhesion and wear resistance. [Solution] The aforementioned problem is solved by means of a piston ring having a hard carbon film 50 formed on at least the outer peripheral sliding surface 11 of a piston ring base material 1, wherein the hard carbon film 50 comprises multiple layers, including an upper layer 5 with a lamination pitch in the range of 3-50 nm, a middle layer 4 with a lamination pitch less than that of the upper layer 5, and a lower layer 3 with a lamination pitch within the same lamination pitch range of the upper layer 5 and greater than the lamination pitch of the middle layer 4. The hard carbon film 50 has an sp2 component ratio of 35-80%, measured in a TEM-EELS spectrum formed by combining electron energy loss spectroscopy (EELS) with a transmission electron microscope (TEM), and the hydrogen content can be configured to be 0.1-5 atom%.

More Like This:

WO/2019/225544	SHOCK ABSORBER
WO/2016/055498	INTERNAL-COMBUSTION ENGINE PISTON RING, PROCESS FOR OBTAINING A PISTON RING, AND INTERNAL-COMBUSTION ENGINE

Inventors:

OZAKI TAKUYA (JP)
SUGIURA HIROYUKI (JP)

Application Number:

PCT/JP2016/072292

Publication Date:

February 09, 2017

Filing Date:

July 29, 2016

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON PISTON RING CO LTD (JP)

International Classes:

F16J9/26; F02F5/00

Foreign References:

JP2000128516A	2000-05-09
JP2000320673A	2000-11-24
JP2003026414A	2003-01-29
JP2015086967A	2015-05-07

Other References: