COMPRESSION RING AND BASE MATERIAL FOR COMPRESSION RING

WIPO Patent Application WO/2015/114822

A1

In order to enable the amount of blow-by gas to be kept small beginning with the initial period of use of an internal combustion engine, and to suppress an increase in the amount of blow-by gas over time even when the internal combustion engine is used over a long period of time, provided are a compression ring and a base material used in this compression ring, said compression ring being used in an internal combustion engine equipped with an aluminum alloy cylinder block and aluminum alloy pistons, and equipped with a ring-shaped compression ring main body portion having a fitting opening, and a hard cover film covering the outer peripheral surface of the compression ring main body portion. The average linear expansion coefficient within a range from room temperature to 200°C is 13.0×10-6/°C or greater. The material forming the compression ring main body portion is a martensite composition carbon steel having a thermal conductivity of 30.0 W/m·K or greater. The hard cover film is selected from nitride cover films and amorphous carbon cover films. A nitride layer having a Vickers hardness (HV) in the range of 700-900 is formed on the upper surface portion and the lower surface portion of the compression ring main body portion.

MARUYAMA HIROAKI (JP)
NAKAZAWA ATSUSHI (JP)
SATO TOMOYUKI (JP)

PCT/JP2014/052344

August 06, 2015

January 31, 2014

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TPR CO LTD (JP)

F16J9/26; C21D1/06; C21D9/40; C22C38/00; C22C38/34; C22C38/46; C23C8/26; C23C8/50; C23C14/06; F02F5/00

JP2013029191A	2013-02-07
JP2002030394A	2002-01-31
JP2002317225A	2002-10-31
JP2000145963A	2000-05-26

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