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1. WO2017032645 - PISTON RING

Publication Number WO/2017/032645
Publication Date 02.03.2017
International Application No. PCT/EP2016/069428
International Filing Date 16.08.2016
IPC
F16J 9/20 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
JPISTONS; CYLINDERS; PRESSURE VESSELS IN GENERAL; SEALINGS
9Piston-rings, seats therefor; Ring sealings of similar construction in general
12Details
20Rings with special cross-section; Oil-scraping rings
F16J 9/26 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
JPISTONS; CYLINDERS; PRESSURE VESSELS IN GENERAL; SEALINGS
9Piston-rings, seats therefor; Ring sealings of similar construction in general
26characterised by the use of particular materials
CPC
F16J 9/20
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
JPISTONS
9Piston-rings ; , e.g. non-metallic piston-rings; , seats therefor; Ring sealings of similar construction
12Details
20Rings with special cross-section
F16J 9/26
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
JPISTONS
9Piston-rings ; , e.g. non-metallic piston-rings; , seats therefor; Ring sealings of similar construction
26characterised by the use of particular materials
Applicants
  • MAHLE METAL LEVE S/A [BR]/[BR]
  • MAHLE INTERNATIONAL GMBH [DE]/[DE]
Inventors
  • ABLAS MARQUES, Gisela
Agents
  • BRP RENAUD UND PARTNER MBB
Priority Data
10 2015 020400 024.08.2015BR
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PISTON RING
(FR) SEGMENT DE PISTON
Abstract
(EN)
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.
(FR)
L'invention concerne un segment de piston, lequel segment comprend au moins un métal de base (1), une face de glissement (10), une face supérieure (20) et une face inférieure (30), des interceptions entre la face de glissement (10) et les faces supérieure et inférieure (20, 30) définissant chacune une région d'intersection supérieure (21) et une région d'intersection inférieure (22), la région d'intersection supérieure définissant un chanfrein de glissement (210), la face inférieure (30) dans la région s'étendant à partir de la région d'intersection inférieure (22) jusqu'à une longueur de 100 à 300 micromètres définissant une région partielle (23), la région périphérique du segment de piston (100) étant nitrurée, le chanfrein de glissement (210), la face de glissement inférieure (10), la région d'intersection inférieure (22) et la zone partielle (23) étant dépourvus de nitruration, de telle sorte que la fragilité du segment (100) provoquée par la nitruration desdites régions, dans lesquelles la récurrence et la propagation de fissures est courante, est réduite, ce qui permet de plus le maintien de régions nitrurées présentant une grande résistance à l'usure.
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