EP2122210A1 - Piston ring - Google Patents

Piston ring

Info

Publication number
EP2122210A1
EP2122210A1 EP07856126A EP07856126A EP2122210A1 EP 2122210 A1 EP2122210 A1 EP 2122210A1 EP 07856126 A EP07856126 A EP 07856126A EP 07856126 A EP07856126 A EP 07856126A EP 2122210 A1 EP2122210 A1 EP 2122210A1
Authority
EP
European Patent Office
Prior art keywords
piston ring
pvd
cover layer
layer
ring according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07856126A
Other languages
German (de)
French (fr)
Inventor
Johannes Esser
Frank Münchow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Federal Mogul Burscheid GmbH
Original Assignee
Federal Mogul Burscheid GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Federal Mogul Burscheid GmbH filed Critical Federal Mogul Burscheid GmbH
Publication of EP2122210A1 publication Critical patent/EP2122210A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/02—Pretreatment of the material to be coated
    • C23C14/024—Deposition of sublayers, e.g. to promote adhesion of the coating
    • C23C14/025—Metallic sublayers
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0641—Nitrides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0676—Oxynitrides

Definitions

  • the invention relates to a piston ring, comprising a base body having a tread provided with a chamber, an upper and a lower flank surface and an inner peripheral surface.
  • EP-A 1 482 075 describes a piston ring coating which is formed by tungsten disulfide.
  • a well-known way to produce relatively sharp running edges on coated rings is the use of full or one-sided chambered rings. Disadvantage of these rings is that a certain part of the tread is inherently not provided with a protective coating and it comes in this area, in which then comes the grandmother material into contact with the cylinder, often to so-called scorching.
  • the invention has for its object to further develop a piston ring to the effect that the said disadvantages are no longer given to optimize the oil balance using a provided with at least one chamber tread.
  • a piston ring having a base body which has a running surface provided with a chambering, an upper and a lower flank surface and an inner circumferential surface, wherein at least the chambering is provided with at least one wear protection layer and at least partially a PVD on the running surface Cover layer is applied, such that the base body in its finished state only edge region side, d. H. outside the chamber, the PVD cover layer has.
  • PVD Physical Vapor Deposition
  • one-sided or fully chambered piston rings made of cast iron or steel materials can be provided with a galvanically or thermally applied wear protection layer.
  • the respective edge region ie outside the chamber, should be provided with the PVD cover layer. This can be achieved by either only the edge areas are provided with the PVD cover layer, or the entire tread including Kamm réelle coated with a PVD cover layer and then the PVD cover layer in the chamber, z. B. by grinding, is removed.
  • the PVD layer can be formed on the basis of nitrides of the elements of group IV b to VI b of the periodic table.
  • the following elements may be added singly or in combination: Al, Si, C, O.
  • PVD DLC diamond-like-carbon
  • Figure 1 piston ring in cross-section, which is provided on the tread side with a chamber on which a PVD cover layer is deposited;
  • FIG. 2 piston ring according to FIG. 1 with the cover layer partially removed;
  • FIG. 1 shows a piston ring 1 which has a basic body of rectangular cross section, including a running surface 2, an upper 3 and a lower flank surface 4 and an inner circumferential surface 5.
  • the running surface 2 is provided with a chamber 6 into which a wear protection layer 7, for example, chromium, is introduced.
  • a wear protection layer 7, for example, chromium is introduced.
  • a PVD covering layer 8 made of CrN is deposited, which in this example should have a thickness of 8 ⁇ m.
  • Alternative materials, such as CrON are also conceivable as a PVD cover layer.
  • FIG. 2 shows the finished state of the piston ring 1. It can be seen that the chamber 6, or the wear protection layer 7 given there, is freed from the PVD covering layer 8 according to FIG. This was achieved by partial grinding of the PVD covering layer 8 in the area of the chambering 6. Thus, only the edge areas 9, 10 remain covered with the PVD covering layer 8. Since these edge regions 9, 10 protrude radially with respect to the wear protection layer 7, an oil reservoir is initially formed, which is advantageous for the running-in behavior of the piston ring 1.
  • FIG 3 shows an alternative to Figure 1.
  • the piston ring 1 'shown here also includes a chamber 6', in which a wear protection layer T is introduced.
  • a wear protection layer T is introduced.
  • only the edge regions 9 ', 10' are provided outside the chamber 6 'with a PVD cover layer 8'.

Abstract

The invention relates to a piston ring, having a base body, which comprises a running surface (2) provided with a chamber (6,6'), an upper (3) and a lower (4) flank surface, and an inner circumferential surface (5), wherein at least the chamber is provided with at least one wear protection layer (7,7'), and a PVD cover layer (8,8') is applied to the running surface at least in some regions such that the base body has the PVD cover layer only in the edge regions (9, 10, 9', 10' ), which is to say outside of the chamber, in the finished state.

Description

Beschreibung description
Kolbenringpiston ring
Die Erfindung betrifft einen Kolbenring, mit einem Grundkörper, der eine mit einer Kammerung versehene Lauffläche, eine obere und eine untere Flankenfläche sowie eine innere Umfangsfläche aufweist.The invention relates to a piston ring, comprising a base body having a tread provided with a chamber, an upper and a lower flank surface and an inner peripheral surface.
In der EP-A 1 482 075 wird eine Kolbenringbeschichtung beschrieben, die durch Wolfram-Disulfϊd gebildet wird.EP-A 1 482 075 describes a piston ring coating which is formed by tungsten disulfide.
Die Ausbildung der unteren Laufkante eines Kolbenringes ist für den Ölhaushalt einer Brennkraftmaschine von großer Bedeutung. Es ist eine Herausforderung für die Fertigung der Kolbenringe, eine möglichst kleine Kante zu erzeugen, um im Motorbetrieb eine möglichst gute Abstreifwirkung zu erzielen. Derart kleine und scharfe Kanten lassen sich relativ einfach an unbeschichteten Ringen darstellen. Allerdings sind heute in der ersten Nut von Brennkraftmaschinen grundsätzlich beschichtete Ringe notwendig. Hierbei stellt sich ein Zielkonflikt zwischen der erwünschten kleinen Funktionskante und einer ausbrach- und rissfreien beschichteten Kante ein.The formation of the lower running edge of a piston ring is for the oil budget of an internal combustion engine of great importance. It is a challenge for the production of the piston rings to produce the smallest possible edge in order to achieve the best possible wiping effect during engine operation. Such small and sharp edges can be relatively easily represented on uncoated rings. However, in the first groove of internal combustion engines basically coated rings are necessary today. Here, a conflict of objectives arises between the desired small functional edge and a burst-free and crack-free coated edge.
Ein bekannter Weg zum Herstellen relativ scharfer Laufkanten an beschichteten Ringen ist der Einsatz von voll oder einseitig gekammerten Ringen. Nachteil dieser Ringe ist, dass ein gewisser Teil der Lauffläche prinzipbedingt nicht mit einer schützenden Beschichtung versehen ist und es in diesem Bereich, in denen dann der Grandwerkstoff mit dem Zylinder in Kontakt kommt, häufig zu so genannter Brandspurbildung kommt. Der Erfindung liegt die Aufgabe zugrunde, einen Kolbenring dahingehend weiter zu bilden, dass zur Optimierung des Ölhaushalts unter Einsatz einer mit mindestens einer Kammerung versehenen Lauffläche die genannten Nachteile nicht mehr gegeben sind.A well-known way to produce relatively sharp running edges on coated rings is the use of full or one-sided chambered rings. Disadvantage of these rings is that a certain part of the tread is inherently not provided with a protective coating and it comes in this area, in which then comes the grandmother material into contact with the cylinder, often to so-called scorching. The invention has for its object to further develop a piston ring to the effect that the said disadvantages are no longer given to optimize the oil balance using a provided with at least one chamber tread.
Die Aufgabe wird gelöst durch einen Kolbenring, mit einem Grundkörper, der eine mit einer Kammerung versehenen Lauffläche, eine obere und eine untere Flankenfläche sowie eine innere Umfangsfläche aufweist, wobei zumindest die Kammerung mit mindestens einer Verschleißschutzschicht versehen ist und auf der Lauffläche zumindest partiell eine PVD-Deckschicht aufgebracht ist, dergestalt, dass der Grundkörper in seinem fertigen Zustand lediglich randbereichsseitig, d. h. außerhalb der Kammerung, die PVD-Deckschicht aufweist.The object is achieved by a piston ring having a base body which has a running surface provided with a chambering, an upper and a lower flank surface and an inner circumferential surface, wherein at least the chambering is provided with at least one wear protection layer and at least partially a PVD on the running surface Cover layer is applied, such that the base body in its finished state only edge region side, d. H. outside the chamber, the PVD cover layer has.
Vorteilhafte Weiterbildungen des Erfindungsgegenstandes sind den Unteransprüchen zu entnehmen.Advantageous developments of the subject invention can be found in the dependent claims.
Bei der PVD-Beschichtung (Physical Vapour Deposition) handelt es sich um ein Verfahren, bei dem die Beschichtung der Lauffläche des Kolbenringes durch Abscheidung aus der Dampfphase erfolgt. Das abzuscheidende Beschichtungsmaterial liegt dabei als ionisierter Teilchenstrom vor.PVD (Physical Vapor Deposition) coating is a process in which the coating of the tread of the piston ring is carried out by deposition from the vapor phase. The deposited coating material is present as an ionized particle stream.
Durch den Erfindungsgegenstand ist es nun möglich, bei Erlangung einer erwünscht gering dimensionierten Funktionskante die Laufflächenbeschichtung ausbruch- und rissfrei im Bereich der Kante zu erzeugen.By the subject invention, it is now possible to generate the tread coating break-out and crack-free in the region of the edge upon obtaining a desired small-sized functional edge.
Von besonderem Vorteil ist, dass einseitig oder voll gekammerte Kolbenringe aus Gussoder Stahlwerkstoffen mit einer galvanisch oder thermisch aufgebrachten Verschleißschutzschicht versehen werden können. Erfindungsgemäß soll im fertigen Zustand des Kolbenringes lediglich der jeweilige Randbereich, d. h. außerhalb der Kammerung, mit der PVD-Deckschicht versehen sein. Dies kann dadurch erreicht werden, dass entweder nur die Randbereiche mit der PVD- Deckschicht versehen werden, oder aber die gesamte Lauffläche samt Kammerung mit einer PVD-Deckschicht überzogen und anschließend die PVD-Deckschicht im Bereich der Kammerung, z. B. durch Schleifen, entfernt wird.It is particularly advantageous that one-sided or fully chambered piston rings made of cast iron or steel materials can be provided with a galvanically or thermally applied wear protection layer. According to the invention, in the finished state of the piston ring, only the respective edge region, ie outside the chamber, should be provided with the PVD cover layer. This can be achieved by either only the edge areas are provided with the PVD cover layer, or the entire tread including Kammerung coated with a PVD cover layer and then the PVD cover layer in the chamber, z. B. by grinding, is removed.
Einem weiteren Gedanken der Erfindung gemäß kann die PVD-Shicht auf Basis von Nitriden der Elemente der Gruppe IV b bis VI b des Periodensystems ausgebildet werden. Wahlweise können folgende Elemente einzeln oder in Kombination zugesetzt werden: Al, Si, C, O.According to a further aspect of the invention, the PVD layer can be formed on the basis of nitrides of the elements of group IV b to VI b of the periodic table. Optionally, the following elements may be added singly or in combination: Al, Si, C, O.
Von besonderem Vorteil sind so genannte PVD-DLC (diamond-like-carbon)- Beschichtungen, die auf die Lauffläche von Kolbenringen aufgebracht werden. Sie bilden besonders verschleißfeste Oberflächen mit niedrigem Reibungskoeffizienten und widerstehen auch höheren Temperaturen. DLC-Schichten weisen darüber hinaus eine gute Haftung auf dem Grundkörper und eine hohe Bruchfestigkeit auf.Of particular advantage are so-called PVD DLC (diamond-like-carbon) coatings, which are applied to the running surface of piston rings. They form particularly wear-resistant surfaces with a low coefficient of friction and also withstand higher temperatures. In addition, DLC coatings have good adhesion to the body and high resistance to breakage.
Der Erfindungsgegenstand ist anhand eines Ausfuhrungsbeispieles in der Zeichnung dargestellt und wird wie folgt beschrieben. Es zeigen:The subject invention is illustrated with reference to an exemplary embodiment in the drawing and is described as follows. Show it:
Figur 1 Kolbenring im Querschnitt, der laufflächenseitig mit einer Kammerung versehen ist, aufweicher eine PVD-Deckschicht abgeschieden ist;Figure 1 piston ring in cross-section, which is provided on the tread side with a chamber on which a PVD cover layer is deposited;
Figur 2 Kolbenring gemäß Figur 1 mit partiell entfernter Deckschicht;FIG. 2 piston ring according to FIG. 1 with the cover layer partially removed;
Figur 3 alternative Ausführungsform eines Kolbenringes. Figur 1 zeigt einen Kolbenring 1, der einen im Querschnitt rechteckigen Grundkörper aufweist, beinhaltend eine Lauffläche 2, eine obere 3 und eine untere Flankenfläche 4 sowie eine innere Umfangsfläche 5. Die Lauffläche 2 ist mit einer Kammerung 6 versehen, in welche eine Verschleißschutzschicht 7, beispielsweise aus Chrom, eingebracht ist. Auf der gesamten Lauffläche 2, inklusive der Kammerung 6, ist eine PVD-Deckschicht 8 aus CrN abgeschieden, die in diesem Beispiel eine Dicke von 8μm aufweisen soll. Alternative Werkstoffe, wie beispielsweise CrON, sind als PVD- Deckschicht ebenfalls denkbar.Figure 3 alternative embodiment of a piston ring. FIG. 1 shows a piston ring 1 which has a basic body of rectangular cross section, including a running surface 2, an upper 3 and a lower flank surface 4 and an inner circumferential surface 5. The running surface 2 is provided with a chamber 6 into which a wear protection layer 7, for example, chromium, is introduced. On the entire running surface 2, including the chamber 6, a PVD covering layer 8 made of CrN is deposited, which in this example should have a thickness of 8 μm. Alternative materials, such as CrON, are also conceivable as a PVD cover layer.
Figur 2 zeigt den fertigen Zustand des Kolbenringes 1. Erkennbar ist, dass die Kammerung 6, respektive die dort gegebene Verschleißschutzschicht 7, von der PVD- Deckschicht 8 gemäß Figur 1 befreit ist. Dies wurde erreicht, durch partielles Abschleifen der PVD-Deckschicht 8 im Bereich der Kammerung 6. Somit bleiben lediglich die Randbereiche 9,10 mit der PVD-Deckschicht 8 bedeckt. Da diese Randbereiche 9,10 gegenüber der Verschleißschutzschicht 7 radial vorstehen, wird zunächst ein Ölreservoir gebildet, das vorteilhaft für das Einlaufverhalten des Kolbenringes 1 ist.FIG. 2 shows the finished state of the piston ring 1. It can be seen that the chamber 6, or the wear protection layer 7 given there, is freed from the PVD covering layer 8 according to FIG. This was achieved by partial grinding of the PVD covering layer 8 in the area of the chambering 6. Thus, only the edge areas 9, 10 remain covered with the PVD covering layer 8. Since these edge regions 9, 10 protrude radially with respect to the wear protection layer 7, an oil reservoir is initially formed, which is advantageous for the running-in behavior of the piston ring 1.
Figur 3 zeigt eine Alternative zu Figur 1. Der hier dargestellte Kolbenring 1 ' beinhaltet ebenfalls eine Kammerung 6', in welcher eine Verschleißschutzschicht T eingebracht ist. In diesem Beispiel werden ausschließlich die Randbereiche 9',10' außerhalb der Kammerung 6' mit einer PVD-Deckschicht 8' versehen. Figure 3 shows an alternative to Figure 1. The piston ring 1 'shown here also includes a chamber 6', in which a wear protection layer T is introduced. In this example, only the edge regions 9 ', 10' are provided outside the chamber 6 'with a PVD cover layer 8'.

Claims

Patentansprüche claims
1. Kolbenring, mit einem Grundkörper, der eine mit einer Kammerung (6,6') versehene Lauffläche (2), eine obere (3) und eine untere Flankenfläche (4) sowie eine innere Umfangsfläche (5) aufweist, wobei zumindest die Kammerung (6,6') mit mindestens einer Verschleißschutzschicht (7,7') versehen ist und auf der Lauffläche (2) zumindest partiell eine PVD-Deckschicht (8,8') aufgebracht ist, dergestalt, dass der Grundkörper in seinem fertigen Zustand lediglich randbereichsseitig (9,10,9', 10'), d. h. außerhalb der Kammerung (6,6'), die PVD- Deckschicht (8,8') aufweist.A piston ring, comprising a base body having a running surface (2) provided with a chamber (6, 6 '), an upper (3) and a lower flank surface (4) and an inner peripheral surface (5), wherein at least the chambering (6,6 ') is provided with at least one wear protection layer (7,7') and on the tread (2) at least partially a PVD cover layer (8,8 ') is applied, such that the base body in its finished state only border area (9,10,9 ', 10'), d. H. outside the chamber (6,6 '), the PVD cover layer (8,8') has.
2. Kolbenring nach Anspruch 1, dadurch gekennzeichnet, dass die PVD-Deckschicht (8,8') auf Basis von CrN und/oder CrON ausgebildet ist.2. Piston ring according to claim 1, characterized in that the PVD cover layer (8,8 ') is formed on the basis of CrN and / or CrON.
3. Kolbenring nach Anspruch 1, dadurch gekennzeichnet, dass die PVD-Schicht (8,8') auf Basis von Nitriden der Elemente der Gruppe IV b bis VI b des Periodensystems mit oder ohne Zusatz von Al und/oder Si und/oder C und/oder O gebildet ist.3. Piston ring according to claim 1, characterized in that the PVD layer (8,8 ') based on nitrides of the elements of group IV b to VI b of the Periodic Table with or without the addition of Al and / or Si and / or C. and / or O is formed.
4. Kolbenring nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die PVD-Deckschicht (8,8') eine Dicke von 0,5 bis 10 μm aufweist.4. Piston ring according to one of claims 1 to 3, characterized in that the PVD cover layer (8,8 ') has a thickness of 0.5 to 10 microns.
5. Kolbenring nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die PVD-Deckschicht (8,8') als reibungs- und verschleißarme PVD-DLC-(diamond- like-carbon)-Schicht ausgebildet ist.5. Piston ring according to one of claims 1 to 4, characterized in that the PVD cover layer (8,8 ') is formed as a friction and low-wear PVD-DLC (diamond-like-carbon) layer.
6. Kolbenring nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die PVD-Deckschicht (8,8') durch Beschichtung ausschließlich des jeweiligen Randbereiches (9', 10') des Grundkörpers aufgebracht ist. 6. Piston ring according to one of claims 1 to 5, characterized in that the PVD cover layer (8,8 ') by coating exclusively of the respective edge region (9', 10 ') of the base body is applied.
7. Kolbenring nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die PVD-Deckschicht (8) ganzflächig auf die Lauffläche (2) aufgebracht ist, wobei die PVD-Deckschicht (8) im Bereich der Kammerung (6) entfernt ist.7. Piston ring according to one of claims 1 to 5, characterized in that the PVD cover layer (8) over the entire surface of the tread (2) is applied, wherein the PVD cover layer (8) in the chamber (6) is removed.
8. Kolbenring nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Verschleißschutzschicht (7,7') galvanisch oder thermisch auf der Lauffläche (2) aufgebracht ist.8. Piston ring according to one of claims 1 to 7, characterized in that the wear protection layer (7,7 ') is applied galvanically or thermally on the tread (2).
9. Kolbenring nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Verschleißschutzschicht (7,7') eine Schichtdicke von 10 bis 100 μm aufweist. 9. Piston ring according to one of claims 1 to 8, characterized in that the wear protection layer (7,7 ') has a layer thickness of 10 to 100 microns.
EP07856126A 2007-02-17 2007-12-18 Piston ring Withdrawn EP2122210A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007007962A DE102007007962B3 (en) 2007-02-17 2007-02-17 Piston ring has base body with bearing surface, provided with compartmentation, which is provided with wear resistant coating, where partial physical vapor deposition covering layer is applied on bearing surface
PCT/DE2007/002279 WO2008098534A1 (en) 2007-02-17 2007-12-18 Piston ring

Publications (1)

Publication Number Publication Date
EP2122210A1 true EP2122210A1 (en) 2009-11-25

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EP07856126A Withdrawn EP2122210A1 (en) 2007-02-17 2007-12-18 Piston ring

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US (1) US8356820B2 (en)
EP (1) EP2122210A1 (en)
JP (1) JP2010518338A (en)
DE (1) DE102007007962B3 (en)
WO (1) WO2008098534A1 (en)

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DE102007007962B3 (en) 2008-05-08
US8356820B2 (en) 2013-01-22
JP2010518338A (en) 2010-05-27
US20100044967A1 (en) 2010-02-25

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