WO2014100871A1 - Segment de piston et procédé de fabrication de segment de piston - Google Patents

Segment de piston et procédé de fabrication de segment de piston Download PDF

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Publication number
WO2014100871A1
WO2014100871A1 PCT/BR2013/000595 BR2013000595W WO2014100871A1 WO 2014100871 A1 WO2014100871 A1 WO 2014100871A1 BR 2013000595 W BR2013000595 W BR 2013000595W WO 2014100871 A1 WO2014100871 A1 WO 2014100871A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston ring
ring
face
inner face
nitrided layer
Prior art date
Application number
PCT/BR2013/000595
Other languages
English (en)
Portuguese (pt)
Inventor
Davi Antônio DA SILVA
Luis Pedro MATIAS PEREIRA
Original Assignee
Mahle Metal Leve S/A
Mahle International 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 Mahle Metal Leve S/A, Mahle International Gmbh filed Critical Mahle Metal Leve S/A
Priority to DE112013006253.4T priority Critical patent/DE112013006253T5/de
Publication of WO2014100871A1 publication Critical patent/WO2014100871A1/fr

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
    • C23C8/06—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 using gases
    • C23C8/08—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 using gases only one element being applied
    • C23C8/24—Nitriding
    • 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
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • 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

Definitions

  • the present invention relates to a piston ring subjected to surface nitriding treatment, with no nitrided or partially nitrided layer on its inner radial face, which is configured to give greater wear homogeneity along the peripheral surface of the piston ring. .
  • the present invention also relates to a manufacturing process of this ring.
  • every internal combustion engine whether Diesel cycle, Otto cycle, two or three stroke, comprises at least one "piston ring".
  • the piston ring is the part that has the function of sealing the space between the engine jacket and the piston piston, isolating the combustion chamber from the other internal engine components.
  • This element is arranged radially at the base of the piston, preventing combustion gases from escaping from the combustion chamber toward the crankcase and preventing engine oil from penetrating the combustion chamber in a reverse path.
  • prior art piston rings 1 comprise an aperture 12 defined between two ends 10', 10 'as disclosed in Figure 5 herein.
  • aperture 12 is useful during installation of the prior art piston ring 1 'around the piston (not shown in the figures). Opening 12 provides access to a tool configured to open ring 1 ', extending its inner diameter beyond the radial outer limits of the piston, thereby enabling its access to the ring pocket, the recess on the outer face of the piston where it is housed. the ring.
  • the piston ring should have good sealing ability, and to ensure the maintenance of this feature throughout its life.
  • the piston ring must have adequate mechanical or breakage stability and also wear resistance against its tribological pairs: the cylinder for its contact face and the piston groove for its side contact face. Excessive wear on the side surfaces and contact face ultimately causes degradation of the combustion chamber's main sealing function and may result in abrupt degradation of engine operating conditions.
  • the nitriding process basically consists of exposing the ring to a heated environment having nitrogen atoms.
  • the result of the application of this process is the creation of an outer layer stiffened by the saturation of the nitrogen element in the crystallographic structure of the metal.
  • the piston ring design (ie its three-dimensional geometric shape) can contribute to longer service engine life by controlling the piston ring wear model by promoting pressure distribution. thus giving greater wear homogeneity along the peripheral surface of the piston ring.
  • the piston ring In order to effectively fulfill its sealing role, the piston ring must have a thin cross-section, be constructed of a material with elastic properties, or be aided by a spring-type blowing agent to provide an expanding force. against the cylinder wall which can be translated into the conformability of the ring to the cylinder. This feature is extremely important when considering the operating conditions of the engine when the cylinder deforms and the ring must conform to the distorted surface of the cylinder. continue to play its role in sealing and heat transmission.
  • the conformability characteristic is directly related to the expansion force of the ring, so the greater the force provided by the ring, the greater the capacity of this component to conform to the cylinder in which it will be accommodated.
  • increasing the expansion force of the rings directly impacts the increase of friction between the ring and the cylinder wall, which is not desirable for the current level of development where the pursuit of increased durability and efficiency has guided the auto industry.
  • the most affected part of the component is the region of the ring to cylinder contact surface.
  • this contact surface - hereinafter referred to as the outer radial face -
  • This increase in wear is mainly due to three main factors: the ring manufacturing process; mechanical loading of the engine and the thermal conditions imposed on the ring during engine operation.
  • the factor relating to the manufacturing process refers to the difficulty of achieving low pressure levels in the tip region (critical zones 11), mainly due to the undesirable effect of bending radius deviation in this position generated by conventional ring production processes. where the diameter of the ring is modified by removing material at the ring ends.
  • the main disadvantage of freeform alternatives to increase the pressure distribution in the piston rings relates to the difficulty of maintaining the shape applied to the ring during its manufacture, since the shape generation operation is one of the first ring fabrication process operations, preceding various material removal, heat treatment and layer coating operations to increase wear resistance, which eventually considerably modify the freeform / radius radius distribution of the ring originally applied .
  • Figure 9 of this document discloses a theoretical diagram of the forces acting on the prior art piston ring 1 'used to manufacture the piston ring.
  • Figure 9.1 shows a diagram of the forces acting on the piston ring of the usual state of the art 1 'when installed internally to the engine (ie with its inner radial face in contact with the piston and its outer radial face in contact with the cylinder). ), and already influenced by shape deviations caused by machining operations, especially operations that modify the ring diameter by removing material from the face of the ring tips. This distribution of forces causes the critical zone 11 regions to wear excessively.
  • the present invention aims to provide a piston ring that reveals greater wear homogeneity along its outer radial surface after prolonged use in an internal combustion engine.
  • the present invention is also directed to the provision of a piston ring that achieves the result described above without reducing the sealing efficiency of the ring or significantly increasing the manufacturing costs of this part.
  • the present invention also provides for a method of manufacturing this piston ring.
  • a piston ring having an upper face, a lower face, an outer face and an inner face; the outer face being integrally covered by a nitrided layer; and at least a portion of the inner face not being covered by this nitrided layer.
  • a substantially annular shaped piston ring having a first outer face and a second inner face having an opening region in which at least a portion of the inner face has no nitrided layer. and exerts a first radial force value taken at the aperture; and a second radial force value taken substantially 180 ° from the aperture region, where the ratio of V1 / V2 is less than 1 and preferably less than 0.5.
  • the objectives of the present invention are also achieved by a process of manufacturing a piston ring consisting of integral nitriding of the entire outer surface of the ring and the subsequent removal of at least a portion of the nitrided layer disposed on the inner face. of this ring.
  • the objectives of the present invention are further achieved by a process of manufacturing a piston ring consisting of partial nitriding of the piston ring. outer surface of the ring while preserving at least part of the inner face of this ring free of a nitrided layer.
  • Figure 1 is a cross-sectional view of the piston ring of the present invention in a first constructive configuration.
  • Figure 2 is a cross-sectional view of the piston ring of the present invention in a second constructive configuration.
  • Figure 3 is a cross-sectional view of the piston ring of the present invention in a third constructive configuration.
  • Figure 4 is a cross-sectional view of the piston ring of the present invention in a fourth embodiment.
  • Figure 5 is a top view of a state of the art piston ring
  • Figures 6.1, 6.2 and 6.3 are photographs of portions of the outer face of the piston ring of the present invention after subjecting to a resistance and fatigue laboratory test.
  • Figures 7.1, 7.2 and 7.3 - are photographs of portions of the prior art piston ring outer face after undergoing a laboratory test of resistance and fatigue.
  • Figure 8 is a diagrammatic representation of the forces acting on the piston ring in a first state of the art characterization against the inner face of the cylinder during a theoretical situation used for the fabrication of the part.
  • Figure 8.1 is a representative diagram of the forces acting on the piston ring in a first state of the art characterization against the inner face of the cylinder for the finished product.
  • Figure 9 is a diagrammatic representation of the forces acting on the piston ring in a first state-of-the-art characterization against the internal cylinder face during a theoretical situation used for part fabrication.
  • Figure 9.1- is a representative diagram of the forces acting on the state of the art piston ring against the inner cylinder face of an engine in a situation for the finished product.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

La présente invention concerne un segment de piston (1, 2, 3, 4) partiellement nitruré. Le segment de piston (1, 2, 3, 4) décrit dans l'invention présente au moins une partie de face intérieure (1d, 2d, 3d, 3.1 d, 4d) exempte de couche nitrurée (13) et une face extérieure (1c, 2c, 3c, 3.1c, 4c) entièrement recouverte d'une couche nitrurée (13). Ce mode de réalisation structural est conçu pour distribuer plus efficacement la pression exercée par la face extérieure du segment (1c, 2c, 3c, 3.1c, 4c) contre le cylindre. Cette distribution plus efficace de forces, à son tour, confère des avantages au segment de piston (1, 2, 3, 3.1, 4), tels qu'une longévité, une résistance, une efficacité et une élasticité accrues. La présente invention concerne également deux procédés de production permettant d'obtenir ce segment de piston (1, 2, 3, 4), qui comprend au moins un segment de piston (1, 2, 3, 4) tel que décrit ci-dessus.
PCT/BR2013/000595 2012-12-27 2013-12-26 Segment de piston et procédé de fabrication de segment de piston WO2014100871A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112013006253.4T DE112013006253T5 (de) 2012-12-27 2013-12-26 Kolbenring, Verfahren zum Herstellen eines Kolbenrings und Kolben mit einem Kolbenring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRBR1020120334364 2012-12-27
BR102012033436A BR102012033436A2 (pt) 2012-12-27 2012-12-27 Anel de pistão, processo de fabricação de anel de pistão e êmbolo dotado de anel de pistão

Publications (1)

Publication Number Publication Date
WO2014100871A1 true WO2014100871A1 (fr) 2014-07-03

Family

ID=50097518

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2013/000595 WO2014100871A1 (fr) 2012-12-27 2013-12-26 Segment de piston et procédé de fabrication de segment de piston

Country Status (3)

Country Link
BR (1) BR102012033436A2 (fr)
DE (1) DE112013006253T5 (fr)
WO (1) WO2014100871A1 (fr)

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502144A1 (de) * 1984-01-23 1985-08-08 Nippon Piston Ring Co., Ltd., Tokio/Tokyo Verfahren zum herstellen eines verschleissbestaendigen kompressionskolbenrings aus stahl
GB2153965A (en) * 1984-01-23 1985-08-29 Nippon Piston Ring Co Ltd Nitrided steel crack resistant piston ring
EP0545094A1 (fr) 1991-12-06 1993-06-09 Federal-Mogul Burscheid GmbH Segment de piston
DE4310248A1 (de) 1993-03-30 1994-10-06 Siemens Ag Verfahren zur Herstellung leichter, biege- und verwindungssteifer Werkstücke in Metall-Keramik-Verbundbauweise
DE4310249C1 (de) 1993-03-30 1994-12-08 Goetze Ag Kolbenring
US6149162A (en) * 1997-12-24 2000-11-21 Teikoku Pistong Ring Co., Ltd. Sliding member
JP2001263488A (ja) 2000-03-15 2001-09-26 Nippon Piston Ring Co Ltd ピストンリング
US20020117808A1 (en) * 2001-02-27 2002-08-29 Katsuaki Ogawa Piston ring
JP2002266698A (ja) * 2001-03-09 2002-09-18 Nippon Piston Ring Co Ltd 高Ｐｍａｘ用ピストンリング
US6631908B2 (en) 2000-08-25 2003-10-14 Federal-Mogul Burscheid Gbmh Compression piston ring
US20060040125A1 (en) * 2002-10-15 2006-02-23 Kabushiki Kaisha Riken Piston ring and thermal spray coating used therein, and method for manufacturing thereof
US20060151959A1 (en) * 2003-03-14 2006-07-13 Dieter Meller Sealing ring and sealing ring arrangement
DE102006003480B3 (de) * 2006-01-25 2007-07-05 Federal-Mogul Burscheid Gmbh Kolbenring
US20090026711A1 (en) 2007-07-27 2009-01-29 Nippon Piston Ring Co., Ltd. Compression piston ring

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502144A1 (de) * 1984-01-23 1985-08-08 Nippon Piston Ring Co., Ltd., Tokio/Tokyo Verfahren zum herstellen eines verschleissbestaendigen kompressionskolbenrings aus stahl
GB2153965A (en) * 1984-01-23 1985-08-29 Nippon Piston Ring Co Ltd Nitrided steel crack resistant piston ring
EP0545094A1 (fr) 1991-12-06 1993-06-09 Federal-Mogul Burscheid GmbH Segment de piston
DE4310248A1 (de) 1993-03-30 1994-10-06 Siemens Ag Verfahren zur Herstellung leichter, biege- und verwindungssteifer Werkstücke in Metall-Keramik-Verbundbauweise
DE4310249C1 (de) 1993-03-30 1994-12-08 Goetze Ag Kolbenring
US6149162A (en) * 1997-12-24 2000-11-21 Teikoku Pistong Ring Co., Ltd. Sliding member
JP2001263488A (ja) 2000-03-15 2001-09-26 Nippon Piston Ring Co Ltd ピストンリング
US6631908B2 (en) 2000-08-25 2003-10-14 Federal-Mogul Burscheid Gbmh Compression piston ring
US20020117808A1 (en) * 2001-02-27 2002-08-29 Katsuaki Ogawa Piston ring
JP2002266698A (ja) * 2001-03-09 2002-09-18 Nippon Piston Ring Co Ltd 高Ｐｍａｘ用ピストンリング
US20060040125A1 (en) * 2002-10-15 2006-02-23 Kabushiki Kaisha Riken Piston ring and thermal spray coating used therein, and method for manufacturing thereof
US20060151959A1 (en) * 2003-03-14 2006-07-13 Dieter Meller Sealing ring and sealing ring arrangement
DE102006003480B3 (de) * 2006-01-25 2007-07-05 Federal-Mogul Burscheid Gmbh Kolbenring
US20090026711A1 (en) 2007-07-27 2009-01-29 Nippon Piston Ring Co., Ltd. Compression piston ring

Also Published As

Publication number Publication date
DE112013006253T5 (de) 2015-10-08
BR102012033436A2 (pt) 2014-09-02

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