Title:
NITRIDED PISTON RING RESISTANT TO CRACK PROPAGATION
Document Type and Number:
WIPO Patent Application WO/2011/079360
Kind Code:
A3
Abstract:
The present invention addresses the problem of how to prevent the nitrided layer on piston rings for flex-fuel engines from becoming detached, without affecting wear resistance. For that purpose, a nitrided piston ring (100, 100') is provided with two nitrided layers (1, 2) and a metallic base (3) mainly composed of iron, the surface hardness of which is of about 800 Vickers and decreases in a substantially linear manner down to 400 Vickers at a distance from the surface of up to 90 micrometres (μm).
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Inventors:
ABLAS MARQUES GISELA (BR)
FERRARESE ANDRE (BR)
OLIVEIRA CLAUDINEI JOSE DE (BR)
VATAVUK JAN (BR)
FERRARESE ANDRE (BR)
OLIVEIRA CLAUDINEI JOSE DE (BR)
VATAVUK JAN (BR)
Application Number:
PCT/BR2010/000427
Publication Date:
September 01, 2011
Filing Date:
December 21, 2010
Export Citation:
Assignee:
MAHLE METAL LEVE SA (BR)
ABLAS MARQUES GISELA (BR)
FERRARESE ANDRE (BR)
OLIVEIRA CLAUDINEI JOSE DE (BR)
VATAVUK JAN (BR)
ABLAS MARQUES GISELA (BR)
FERRARESE ANDRE (BR)
OLIVEIRA CLAUDINEI JOSE DE (BR)
VATAVUK JAN (BR)
International Classes:
F16J9/26; C23C8/02; C23C8/26; C23C8/38
Domestic Patent References:
| WO1998025017A1 | 1998-06-11 | |||
| WO1998019084A1 | 1998-05-07 |
Foreign References:
| US20040262847A1 | 2004-12-30 | |||
| JP2007278314A | 2007-10-25 | |||
| JPS5827860A | 1983-02-18 |
Attorney, Agent or Firm:
DANNEMANN, SIEMSEN, BIGLER & IPANEMA MOREIRA (Rua Marquês de Olinda 7, -040 Rio de Janeiro RJ, BR)
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