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1. (WO2017032645) PISTON RING

Pub. No.:    WO/2017/032645    International Application No.:    PCT/EP2016/069428
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Wed Aug 17 01:59:59 CEST 2016
IPC: F16J 9/20
F16J 9/26
Applicants: MAHLE METAL LEVE S/A
MAHLE INTERNATIONAL GMBH
Inventors: ABLAS MARQUES, Gisela
Title: PISTON RING
Abstract:
A piston ring is described comprising at least a metal base (1), a sliding face (10), a superior face (20) and an inferior face (30), the interceptions between the sliding face (10) and the superior and inferior faces (20, 30) defining, each thereof, a region of superior intersection (21) and a region of inferior intersection (22), the region of superior intersection defining a sliding chamfer (210), the inferior face (30) in the region extending from the region of inferior intersection (22) by up to a length of 100 to 300 micrometres defining a partial region (23), the perimetric region of the piston ring (100) being nitrided, the sliding chamfer (210), the sliding face (10), the region of inferior intersection (22) and the partial region (23) being devoid of nitridation such that the fragility is reduced of the ring (100) caused by the nitridation of the said regions wherein the recurrence and propagation of cracks is common, in addition permitting the maintenance of nitrided regions having great wear resistance.