WO2007025533A1 - Verfahren zur herstellung eines kolbenrings für verbrennungsmotoren sowie einen derartigen kolbenring - Google Patents
Verfahren zur herstellung eines kolbenrings für verbrennungsmotoren sowie einen derartigen kolbenring Download PDFInfo
- Publication number
- WO2007025533A1 WO2007025533A1 PCT/DE2006/001531 DE2006001531W WO2007025533A1 WO 2007025533 A1 WO2007025533 A1 WO 2007025533A1 DE 2006001531 W DE2006001531 W DE 2006001531W WO 2007025533 A1 WO2007025533 A1 WO 2007025533A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston ring
- layer
- ring
- piston
- chromium
- Prior art date
Links
Classifications
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49274—Piston ring or piston packing making
Definitions
- the present invention relates to a method for producing a piston ring for internal combustion engines and such a piston ring.
- Piston rings of trapezoidal cross-section in which the ring height is greater on the outer peripheral surface than on the inner peripheral surface, are also referred to as trapezoidal rings.
- a piston ring in which a ring flank is formed parallel to the inner and outer peripheral surfaces while the other ring flank extends at an angle thereto is referred to as a (simple) trapezoidal ring.
- a piston ring, in which both ring flanks extend at an angle to the peripheral surfaces, is called a double trapezoidal ring.
- Such piston rings are preferably used in diesel engines as the top piston ring (top ring), wherein the associated piston ring groove is also formed trapezoidal.
- diesel engines tend to deposit hard carbonaceous residues in the uppermost Kolbenringnut, which can lead to a festging of the piston rings and thus to functional failures. Due to the trapezoidal design of the uppermost piston ring and its kingpin groove, the festival is usually prevented and thus ensures the sealing function of the piston ring.
- European published patent application EP 0 605 223 A1 describes a piston ring whose surface has been hardened by gas nitriding. On the later running surface, a metal nitride layer is applied over the gas nitriding layer as a tribological layer.
- German Offenlegungsschrift DE 102 07 148 A1 also describes a piston ring with a nitriding layer composed of a diffusion layer and a connecting layer, a deposit layer of hard ceramic being provided on the later running surface after removal of the diffusion layer.
- the trapezoidal rings or double trapezoidal rings produced in this way exhibit increased fretting damage (so-called “fretting") on the ring flanks, with additional coking being detectable, in particular at high ignition pressures of 200 bar to 220 bar with the running time of the piston rings and eventually lead to their failure. It has also been found that these damages can be location-dependent, that is, that they can vary greatly along the circumference of the ring flanks. Especially at those points where the nitriding layer was removed, these damages occur frequently.
- the present invention is therefore based on the object to provide a method for producing a piston ring and such a piston ring, with which the occurrence of ring flank damage to trapezoidal rings or double trapezoidal rings during engine operation is largely prevented.
- Trapezoidal rings or double trapezoidal rings with wear-resistant ring flanks are provided by the method according to the invention, which have significantly reduced fretting damage during engine operation (so-called “fretting") the hardening pro- Z ⁇ SS, it is possible to produce a uniform hardened layer with uniform depth on the ring flanks of the trapezoidal ring or double trapezoidal ring. This uniformly high hardness values are obtained so that along the circumference of the ring edges substantially no Reibverschl employ2020 impairing the piston ring function impairing occur. Likewise, micro welds between piston ring and piston are effectively prevented.
- the metal strip is, for example, converted by cutting or non-cutting machining into a trapezoidal cross-section, preferably by grinding, for example.
- the machined surface or the machined surfaces should later form the ring flank or ring flanks of the piston ring to be produced. It is advantageous if, in addition to the beveled surface (s), regions which continue to run parallel to each other are also retained.
- the width of the mutually parallel regions is preferably at most a quarter of the total width of the steel strip.
- the parallel areas can serve as stacking surfaces for packaging the trapezoidal rings or double trapezoidal rings in the later processing of the piston ring.
- both an endless metal strip and a blank can be used and processed to obtain the at least one beveled surface.
- the machining can be done in a continuous process.
- trapezoidal in cross-section metal band becomes a Molded piston ring, optionally separated to the required length, if an endless metal strip is used, and then the further processing, in particular a mechanical processing, for example, the surfaces and / or a heat treatment subjected.
- a wear protection layer preferably a chromium layer or a chromium nitride layer, can additionally be applied to the lower ring flanks of the piston ring, since experience has shown that the lower ring flanks are subjected to particularly high stress.
- an additional wear protection layer or tribological layer may be applied to the outer circumferential surface or tread of the piston ring to increase the life of the trapezoidal rings or double trapezoidal rings.
- the trapezoidal rings or double trapezoidal rings are preferably stacked under axial bias to form a package. This avoids that the ring flanks are coated with the wear protection layer, if this is not desired.
- Fig. 1 is a schematic representation of the manufacturing process for a double trapezoidal ring according to the prior art
- FIG. 2 shows a schematic representation of a double trapezoidal ring produced by the method according to the invention
- FIG. 3 is a schematic representation of the manufacturing process for a double trapezoidal ring according to the invention
- Fig. 4 is an illustration of the location-dependent Reibverschl composeJden on the ring flanks of a double trapezoidal ring according to the prior art on the one hand and according to the invention on the other.
- Fig. 1 shows again the production of a piston ring 30 of a trapezoidal ring according to the prior art.
- a piston ring 30 is formed in a conventional manner.
- surface hardening typically nitriding
- a hardened layer 21 in this case a nitriding layer of a diffusion layer and a connecting layer, forms along the surface of the piston ring 30.
- the outer peripheral surface is provided with a wear-resistant layer 32 (not shown).
- beveled surfaces 15, 16 and a higher narrow side 12 and a lower narrow side 11 are formed with mutually parallel surfaces 13, 14 are maintained, which adjoin the beveled surfaces 15, 16 and the higher narrow side 12.
- the mutually parallel surfaces 13, 14 are used in the exemplary embodiment, the stackability of the piston rings, which is advantageous in some of the subsequent processing steps to ensure.
- Their width is, for example, up to a quarter, preferably less than a quarter of the width of the steel strip 20th
- the steel strip 20 thus processed is formed in a conventional manner by suitable devices to a piston ring 10 and possibly cut off, the higher narrow side of the steel strip 20 in the outer peripheral surface 12 and the lower narrow side of the steel strip 20 in the inner peripheral surface 11 of Piston ring 10 is transferred.
- the surfaces 13, 15 form the upper annular edge and the surfaces 14, 16, the lower annular edge of the piston ring 10th
- the piston ring 10 thus has a trapezoidal cross-section already after this production step.
- the piston ring 10 is subjected to a hardening process.
- the piston ring 10 by means of a per se known Gasnitrierpro- nitrided over its entire surface, so that a circumferential nitriding layer 21 results, which consists in the embodiment of a diffusion layer and a connecting layer, wherein the Nitrierhärtiefe can be up to 200 microns in the diffusion layer.
- the bonding layer has , for example, a Vickers hardness 700 HVO, 05 at a layer thickness of about 5 to 10 ⁇ m. If the steel strip 20 contains chromium, hard chromium nitrides are formed during nitriding.
- the bonding layer is separated from the surface of the piston ring 10, i. From the outer peripheral surface and from the annular edges of the piston ring 10, for example. Removed by grinding.
- the desired piston ring 10 is present, in the embodiment in the form of a double trapezoidal ring.
- a chromium or chromium nitride preferably be applied to the lower ring flank with the surfaces 14, 16, as there especially in the trapezoidal rings produced according to the prior art there Reibverschl devisden have shown.
- a wear protection layer or tribological layer is applied on the outer peripheral surface 12, which corresponds to the later running surface of the piston ring 10, if necessary.
- a wear protection layer or tribological layer is applied on the outer peripheral surface 12, which corresponds to the later running surface of the piston ring 10, if necessary.
- a wear protection layer or tribological layer is applied on the outer peripheral surface 12, which corresponds to the later running surface of the piston ring 10, if necessary.
- a wear protection layer or tribological layer is applied on the outer peripheral surface 12, which corresponds to the later running surface of the piston ring 10.
- a wear protection layer or tribological layer is applied on the outer peripheral surface 12, which corresponds to the later running surface of the piston ring 10.
- a wear protection layer or tribological layer is applied on the outer peripheral surface 12, which corresponds to the later running surface of the piston ring 10.
- a wear protection layer or tribological layer is applied on the outer peripheral surface 12, which corresponds to the later running surface of the piston ring
- a galvanic hard chrome layer or a thermal spray layer or a manganese phosphate layer may also be applied to the outer peripheral surface 12.
- the coating of the outer circumferential surface 12 and later running surface of the piston ring 10 is expediently carried out in the stacked and axially braced state of a plurality of piston rings 10. In particular, this ensures that the surfaces 13, 14, 15, 16 of the annular edges during the coating process not with the applied wear protection layer or be coated tribological layer.
- FIG. 4 shows a representation of the local peripheral frictional wear damage for a 6-cylinder diesel engine with a running time of 100 hours under full load, on the one hand for a piston ring according to the prior art, on the one hand for a piston ring 10 produced according to the invention in the form of a double trapezoidal ring. It can be seen from the graph that the piston ring 10 produced according to the invention shows significantly less fretting damage on the ring flanks compared with the prior art.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/991,239 US20080256794A1 (en) | 2005-09-01 | 2006-08-31 | Method For the Production of a Piston Ring For Internal Combustion Engine and a Piston Ring of this Type |
BRPI0615327-5A BRPI0615327A2 (pt) | 2005-09-01 | 2006-08-31 | processo para produção de um anel de pistão para motores de combustão interna bem como um anel de pistão desse tipo |
JP2008528337A JP2009507160A (ja) | 2005-09-01 | 2006-08-31 | 内燃機関用のピストンリングを製作するための方法及びこのようなピストンリング |
EP06791337A EP1920175A1 (de) | 2005-09-01 | 2006-08-31 | Verfahren zur herstellung eines kolbenrings für verbrennungsmotoren sowie einen derartigen kolbenring |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005041408.7 | 2005-09-01 | ||
DE102005041408A DE102005041408A1 (de) | 2005-09-01 | 2005-09-01 | Verfahren zur Herstellung eines Kolbenrings für Verbrennungsmotoren sowie einen derartigen Kolbenring |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007025533A1 true WO2007025533A1 (de) | 2007-03-08 |
Family
ID=37527760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2006/001531 WO2007025533A1 (de) | 2005-09-01 | 2006-08-31 | Verfahren zur herstellung eines kolbenrings für verbrennungsmotoren sowie einen derartigen kolbenring |
Country Status (8)
Country | Link |
---|---|
US (1) | US20080256794A1 (de) |
EP (1) | EP1920175A1 (de) |
JP (1) | JP2009507160A (de) |
CN (1) | CN101253353A (de) |
BR (1) | BRPI0615327A2 (de) |
DE (1) | DE102005041408A1 (de) |
RU (1) | RU2008111969A (de) |
WO (1) | WO2007025533A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011120591A1 (de) | 2011-12-08 | 2013-06-13 | Federal-Mogul Burscheid Gmbh | Verfahren zur Bearbeitung von Kolbenringen |
DE102012004760A1 (de) | 2012-03-08 | 2013-09-12 | Federal-Mogul Burscheid Gmbh | Verfahren zur Herstellung eines Kolbenrings sowie Kolbenring |
DE102013010749B3 (de) * | 2013-06-27 | 2014-10-30 | Federal-Mogul Burscheid Gmbh | Verfahren zur Herstellung eines Kolbenrings mit reduziertem Stoßdruck, sowie Kolbenring mit reduziertem Stoßdruck |
Families Citing this family (17)
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DE102007038188B4 (de) * | 2007-08-13 | 2018-11-15 | Federal-Mogul Burscheid Gmbh | Verschleißfest beschichteter Kolbenring und Verfahren zu dessen Herstellung |
US10036471B2 (en) * | 2009-11-18 | 2018-07-31 | Achates Power, Inc. | Ported engine constructions with low-tension compression seals |
CN102741535B (zh) * | 2010-01-29 | 2014-09-10 | 日本活塞环株式会社 | 活塞环 |
JP5425722B2 (ja) * | 2010-06-23 | 2014-02-26 | 日立建機株式会社 | 斜軸式液圧回転機 |
JP2012052637A (ja) * | 2010-09-03 | 2012-03-15 | Denso Corp | 流体制御弁 |
DE102010046551B4 (de) * | 2010-09-27 | 2014-09-04 | Federal-Mogul Burscheid Gmbh | Verfahren zur Herstellung eines Kolbenrings |
DE102010047961A1 (de) * | 2010-10-08 | 2012-04-12 | Federal-Mogul Burscheid Gmbh | Verfahren zur Herstellung eines Kolbenrings |
CN102166707B (zh) * | 2011-04-08 | 2013-01-09 | 云峰发电厂 | 水电机组空气阀浮筒制作方法 |
BRPI1103935A2 (pt) | 2011-08-17 | 2013-08-06 | Mahle Metal Leve Sa | anel de pistço |
EP2610532A1 (de) * | 2011-12-30 | 2013-07-03 | FPT Industrial S.p.A. | Abdichtungseinheit eines Kolbens eines Verbrennungsmotors |
DE102012204156A1 (de) * | 2012-03-16 | 2013-09-19 | Federal-Mogul Burscheid Gmbh | Kolbenring mit Chrom-Feststoffpartikel-Verschleißschutzschicht und korrosionsbeständiger Flankenfläche |
DE102013200261A1 (de) * | 2013-01-10 | 2014-07-10 | Federal-Mogul Burscheid Gmbh | Kolbenring für Brennkraftmaschinen mit erhöhter Ermüdungsfestigkeit und Verfahren zu dessen Herstellung |
BR102013018952B1 (pt) * | 2013-07-24 | 2021-10-26 | Mahle Metal Leve S/A | Conjunto de deslizamento |
US9587501B2 (en) | 2013-11-11 | 2017-03-07 | General Electric Company | Rotary machine secondary sealing assembly and method of assembling the same |
CN104526288A (zh) * | 2014-12-30 | 2015-04-22 | 宁波韵升弹性元件有限公司 | 一种活塞环的加工方法 |
CN106122469A (zh) * | 2016-07-13 | 2016-11-16 | 邹敏 | 一种梯面外阶cks扭曲活塞环 |
CN112377614B (zh) * | 2020-11-11 | 2023-02-24 | 马勒汽车技术(中国)有限公司 | 用于发动机的活塞环及活塞环的加工方法 |
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DE3401261A1 (de) * | 1983-01-17 | 1984-07-19 | Nippon Piston Ring Co., Ltd., Tokyo | Kolbenring |
JPS60172773A (ja) * | 1984-02-16 | 1985-09-06 | Teikoku Piston Ring Co Ltd | 高耐久性ピストンリング及びその製造方法 |
DE3506746A1 (de) | 1984-03-07 | 1985-09-19 | Nippon Piston Ring Co., Ltd., Tokio/Tokyo | Kolbenring |
JPS60206962A (ja) * | 1984-03-30 | 1985-10-18 | Riken Corp | 内燃機関用鉄鋼製ピストンリング |
EP0605223A1 (de) | 1992-12-29 | 1994-07-06 | Dana Corporation | Gas nitrierter Kolbenring |
DE19648160A1 (de) * | 1996-11-21 | 1998-06-04 | Ae Goetze Gmbh | Kompressionskolbenring |
US5901963A (en) * | 1996-10-30 | 1999-05-11 | Dana Corporation | Gas nitrided taper faced keystone piston ring incorporating a sealing land and orientation groove |
DE19940022A1 (de) * | 1998-08-31 | 2000-03-02 | Nippon Piston Ring Co Ltd | Kolbenring und Kolbenringkombination für einen Dieselmotor mit Direkteinspritzung |
US6279913B1 (en) * | 1998-10-15 | 2001-08-28 | Teikoku Piston Ring Co., Ltd. | Sliding member and manufacturing method thereof |
DE10207148A1 (de) | 2001-02-27 | 2002-09-12 | Nippon Piston Ring Co Ltd | Kolbenring |
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JP2002323133A (ja) * | 2001-02-23 | 2002-11-08 | Teikoku Piston Ring Co Ltd | 圧力リング用線材及び圧力リングとその製造方法 |
JP4457336B2 (ja) * | 2001-07-30 | 2010-04-28 | 日立金属株式会社 | 異形線材の成形方法と装置 |
US20050260436A1 (en) * | 2004-05-24 | 2005-11-24 | Einberger Peter J | Wear resistant coating for piston rings |
-
2005
- 2005-09-01 DE DE102005041408A patent/DE102005041408A1/de not_active Withdrawn
-
2006
- 2006-08-31 JP JP2008528337A patent/JP2009507160A/ja active Pending
- 2006-08-31 US US11/991,239 patent/US20080256794A1/en not_active Abandoned
- 2006-08-31 EP EP06791337A patent/EP1920175A1/de not_active Withdrawn
- 2006-08-31 BR BRPI0615327-5A patent/BRPI0615327A2/pt not_active IP Right Cessation
- 2006-08-31 RU RU2008111969/06A patent/RU2008111969A/ru not_active Application Discontinuation
- 2006-08-31 CN CNA200680032167XA patent/CN101253353A/zh active Pending
- 2006-08-31 WO PCT/DE2006/001531 patent/WO2007025533A1/de active Application Filing
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3401261A1 (de) * | 1983-01-17 | 1984-07-19 | Nippon Piston Ring Co., Ltd., Tokyo | Kolbenring |
JPS60172773A (ja) * | 1984-02-16 | 1985-09-06 | Teikoku Piston Ring Co Ltd | 高耐久性ピストンリング及びその製造方法 |
DE3506746A1 (de) | 1984-03-07 | 1985-09-19 | Nippon Piston Ring Co., Ltd., Tokio/Tokyo | Kolbenring |
JPS60206962A (ja) * | 1984-03-30 | 1985-10-18 | Riken Corp | 内燃機関用鉄鋼製ピストンリング |
EP0605223A1 (de) | 1992-12-29 | 1994-07-06 | Dana Corporation | Gas nitrierter Kolbenring |
US5901963A (en) * | 1996-10-30 | 1999-05-11 | Dana Corporation | Gas nitrided taper faced keystone piston ring incorporating a sealing land and orientation groove |
DE19648160A1 (de) * | 1996-11-21 | 1998-06-04 | Ae Goetze Gmbh | Kompressionskolbenring |
DE19940022A1 (de) * | 1998-08-31 | 2000-03-02 | Nippon Piston Ring Co Ltd | Kolbenring und Kolbenringkombination für einen Dieselmotor mit Direkteinspritzung |
US6279913B1 (en) * | 1998-10-15 | 2001-08-28 | Teikoku Piston Ring Co., Ltd. | Sliding member and manufacturing method thereof |
DE10207148A1 (de) | 2001-02-27 | 2002-09-12 | Nippon Piston Ring Co Ltd | Kolbenring |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011120591A1 (de) | 2011-12-08 | 2013-06-13 | Federal-Mogul Burscheid Gmbh | Verfahren zur Bearbeitung von Kolbenringen |
DE102012004760A1 (de) | 2012-03-08 | 2013-09-12 | Federal-Mogul Burscheid Gmbh | Verfahren zur Herstellung eines Kolbenrings sowie Kolbenring |
DE102012004760B4 (de) * | 2012-03-08 | 2013-10-31 | Federal-Mogul Burscheid Gmbh | Verfahren zur Herstellung eines Trapezkolbenrings sowie Trapezkolbenring |
DE102013010749B3 (de) * | 2013-06-27 | 2014-10-30 | Federal-Mogul Burscheid Gmbh | Verfahren zur Herstellung eines Kolbenrings mit reduziertem Stoßdruck, sowie Kolbenring mit reduziertem Stoßdruck |
WO2014206386A1 (de) | 2013-06-27 | 2014-12-31 | Federal-Mogul Burscheid Gmbh | Verfahren zur herstellung eines kolbenrings sowie kolbenring mit reduziertem stossdruck |
Also Published As
Publication number | Publication date |
---|---|
US20080256794A1 (en) | 2008-10-23 |
EP1920175A1 (de) | 2008-05-14 |
JP2009507160A (ja) | 2009-02-19 |
RU2008111969A (ru) | 2009-10-10 |
DE102005041408A1 (de) | 2007-03-08 |
CN101253353A (zh) | 2008-08-27 |
BRPI0615327A2 (pt) | 2011-05-17 |
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