PISTON RING - NIPPON PISTON RING CO LTD

Title:

PISTON RING

Document Type and Number:

WIPO Patent Application WO/2008/016009

Kind Code:

A1

Abstract:

Disclosed is a piston ring which can vary a tension under low-temperature and low-load conditions and a tension under high-temperature and high-load conditions, and therefore can minimize the friction loss and improve the fuel efficiency. The piston ring is formed by a shape memory alloy comprising 34.7 to 48.5 mol% inclusive of nickel, 9 to 22.5 mol% inclusive of at least either one of zirconium and hafnium and 1 to 30 mol% of niobium, with the remainder being titanium and unavoidable impurities.

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Inventors:

MIYAZAKI SHUICHI (JP)
ONODA MOTONOBU (JP)
OKADA NAOKI (JP)
FUJII YOSHITAKA (JP)
KIM HEE YOUNG (JP)

Application Number:

PCT/JP2007/064901

Publication Date:

February 07, 2008

Filing Date:

July 30, 2007

Export Citation:

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Assignee:

NIPPON PISTON RING CO LTD (JP)
MIYAZAKI SHUICHI (JP)
ONODA MOTONOBU (JP)
OKADA NAOKI (JP)
FUJII YOSHITAKA (JP)
KIM HEE YOUNG (JP)

International Classes:

C22C14/00; C22C19/03; F02F5/00; F16J9/06; F16J9/26

Foreign References:

JPS58157934A	1983-09-20
JPS61119639A	1986-06-06
JPH0543969A	1993-02-23

Attorney, Agent or Firm:

ISHIKAWA, Yasuo (17-11 Shiba 2-chome, Minato-k, Tokyo 14, JP)

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