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WO2009000245A1 - Segment de piston - Google Patents

Segment de piston Download PDF

Info

Publication number
WO2009000245A1
WO2009000245A1 PCT/DE2008/001005 DE2008001005W WO2009000245A1 WO 2009000245 A1 WO2009000245 A1 WO 2009000245A1 DE 2008001005 W DE2008001005 W DE 2008001005W WO 2009000245 A1 WO2009000245 A1 WO 2009000245A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston ring
ring
sections
piston
ring according
Prior art date
Application number
PCT/DE2008/001005
Other languages
German (de)
English (en)
Inventor
Wolfgang Issler
Original Assignee
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 International Gmbh filed Critical Mahle International Gmbh
Publication of WO2009000245A1 publication Critical patent/WO2009000245A1/fr

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
    • F16J9/12—Details
    • F16J9/14—Joint-closures

Definitions

  • the present invention relates to a piston ring for a piston of an internal combustion engine with an annular body, with a ring butt forming butt ends and a ring outer diameter determining annular raceway and the ring inner diameter determining ring inner surface and a method for producing such a piston ring.
  • a generic piston ring has the purpose to seal the combustion chamber in an internal combustion engine against the crankcase and at the same time derive the heat generated during operation in the combustion chamber via its running surface from the piston to the cylinder.
  • the piston ring must be tight against the cylinder wall during piston movement.
  • the butt ends of a piston ring emanating from the ring impact are affected by a high heat load, which leads to an increased radial pressure on the butt ends as a result of the internal stresses occurring in the piston ring.
  • This increased point force in the region of the butt ends causes an increased contact pressure and thus wear of the tread on the butt ends and possibly in adjacent areas a decrease in the radial pressure, which can lead to unwanted leaks between the ring race and the cylinder wall.
  • the solution consists in a piston ring having the features of claim 1.
  • a portion of a material different from the material of the annular body is provided on the annular body in the region of each abutment end, and that the material of the sections has a lower coefficient of thermal expansion than that Material of the ring body.
  • the present invention also relates to a method for producing such a piston ring, in which the piston ring is bent from a strip-shaped semifinished product, wherein the material forming the portion is applied to the strip-shaped semifinished product before the rounding of the piston ring.
  • the basic idea of the present invention therefore consists in compensating the increased radial pressure resulting from the high heat load of the butt ends on the butt ends by providing sections of a separate material in this area.
  • This material differs from the material used for the ring body by its smaller thermal expansion coefficient. This ensures that the high heat load in the region of the butt ends no longer leads to a widening of the butt ends in the direction of the cylinder wall as before, but that the butt ends remain substantially in their desired position.
  • This substantially avoids the increased point force observed in the prior art in the area of the butt ends, so that the radial pressure in adjacent regions of the piston ring no longer decreases, but remains substantially constant. This also no longer leads to increased wear of the running surface in the area of the butt ends or to leaks between the ring running surface and the cylinder wall.
  • the piston ring according to the invention is also easy to produce, in particular with the method according to the invention.
  • the shape and configuration of the sections provided according to the invention are at the discretion of the person skilled in the art as long as the effect according to the invention is achieved.
  • the sections can, for example, at least partially extend over the entire cross section of a respective abutment end of the piston ring, but they can also extend, for example, only over one of the ring inner surface facing partial cross section of a butt end of the piston ring.
  • the sections may, for example, also begin at the respective butt end starting steadily decreasing or stepwise decreasing or even constant partial cross-sections.
  • the sections can occupy 10% to 100% of the total ring width dimension.
  • a further embodiment of the invention provides that the sections, starting from the respective butt end, extend over a circular arc enclosing an angle of 15 to 45 degrees. Such a size is usually sufficient to achieve the effect of the invention.
  • Chromium, molybdenum, tungsten, titanium, carbide materials or an Invar alloy may be considered as materials for the sections, while the annular body is usually made of steel or cast iron.
  • the sections according to the invention can be connected in any way with the ring body, for example by means of plasma or HVOF spraying, laser welding, electroplating, cold spraying, plating, friction welding, gluing, soldering, casting or composite casting.
  • At least the ring running surface of the piston ring according to the invention can be provided with a material of high abrasion resistance.
  • a material of high abrasion resistance examples include chromium, PVD coatings, HVOF coatings or dergL
  • 1a shows an embodiment of the piston ring according to the invention in a plan view
  • FIG. 1b shows the piston ring according to FIG. 1a in section along the line Ib-Ib in FIG. 1a;
  • FIG. 1c shows the piston ring in the illustration according to FIG. 1b with a coating
  • Figure 2a shows a further embodiment of the piston ring according to the invention in a plan view
  • FIG. 2b shows the piston ring according to FIG. 2a in a section along the line IIb-IIb in FIG. 2a
  • FIG. 2c shows the piston ring in the illustration according to FIG. 2b with a coating
  • FIG. 3 shows a semi-finished product for producing a piston ring according to FIG. 2a in a plan view.
  • Figures 1a and 1b show a first embodiment of a piston ring 10 according to the invention for a piston of an internal combustion engine.
  • the piston ring 10 is made of steel or cast iron and has an annular body 11 with an approximately rectangular cross-section.
  • the piston ring 10 has a ring running surface 12 along its outer circumferential surface, which determines the outer diameter of the piston ring 10.
  • the piston ring 10 also has an inner ring surface 13 defining the inner diameter of the ring.
  • the piston ring 10 has a ring impact 14, which is formed and limited by butt ends 15, 16.
  • the piston ring 10 is provided in the region of its butt ends 15, 16 with portions 17, 18, which are made of a material having a smaller coefficient of thermal expansion than the material of the annular body 11.
  • the sections 17, 18 extend in the embodiment over the entire cross section the butt ends, as shown in Figures 1 b and 1c can be seen.
  • a ring body 11 made of steel or cast iron suitable as a material for the sections, for example, chromium, molybdenum, tungsten, titanium, hard metal materials or an Invar alloy.
  • the sections 17, 18 are connected to the annular body by plasma or HVOF spraying, laser welding, electroplating, cold spraying, plating, friction welding, gluing, soldering, casting or composite casting, depending on the materials used.
  • the sections 17, 18 extend in the embodiment over an arc of the piston ring 10, which includes an angle ⁇ of 30 degrees.
  • the piston ring 10 is provided with a coating 19 made of a material with high abrasion resistance.
  • a coating 19 made of a material with high abrasion resistance.
  • Figures 2a and 2b show another embodiment of a piston ring 20 according to the invention for a piston of an internal combustion engine.
  • the piston ring 20 is made of steel or cast iron and has an annular body 21 with an approximately rectangular cross-section.
  • the piston ring 20 has a ring running surface 22 along its outer circumferential surface, which determines the outer diameter of the piston ring 20.
  • the piston ring 20 also has an inner ring surface 23 defining the inner diameter of the ring.
  • the piston ring 20 has a ring joint 24, which is formed and limited by butt ends 25, 26.
  • the piston ring 20 is in the region of its butt ends 25, 26 provided with portions 27, 28 which are made of a material having a smaller coefficient of thermal expansion than the material of the annular body 21.
  • the sections 27, 28 extend in the embodiment in each case via one of Ring inner surface 23 facing partial cross-section of each butt end 25, 26 of the piston ring 20, as shown in Figures 2b and 2c can be seen.
  • the sections 27, 28 are approximately wedge-shaped, that is, the sections 27, 28 have at the butt ends 25, 26 continuously decreasing partial cross-sections.
  • the sections can also be formed with stepwise reducing partial cross sections or have a constant partial cross section throughout.
  • the sections can be at the respective butt end over the entire Extending cross-section, similar to how it is shown in Figure 1a and starting therefrom have steadily or stepwise decreasing partial cross-sections.
  • a ring body 21 made of steel or cast iron suitable as a material for the sections for example, chromium, molybdenum, tungsten, titanium, hard metal materials or an Invar alloy.
  • the sections 27, 28 are connected to the ring body by plasma or HVOF spraying, laser welding, electroplating, cold spraying, plating, friction welding, gluing, soldering, casting or composite casting, depending on the materials used.
  • the sections 27, 28 extend in the embodiment over an arc of the piston ring 20, which includes an angle ⁇ of 30 degrees.
  • the piston ring 20 on the running surface is provided with a coating 29 made of a material with high abrasion resistance.
  • a coating 29 made of a material with high abrasion resistance.
  • FIG 3 shows schematically a strip-shaped semifinished product 30, as it is used in a conventional manner for the production of piston rings.
  • the semi-finished product 30 is provided in the embodiment for producing a piston ring 20 according to FIG 2a and has a base body 31 which is provided in its end regions with the sections 27, 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne un segment de piston (10, 20) pour un piston d'un moteur à combustion interne, comprenant un corps de segment (11, 21), comportant des extrémités de la coupe (15, 16; 25, 26) formant une coupe annulaire (14, 24) de segment de piston, une surface (12, 22) de frottement annulaire définissant le diamètre extérieur du segment, et une surface interne (13, 23) annulaire définissant le diamète interne annulaire. Selon l'invention, une partie (17, 18; 27, 28) fabriquée dans un matériau différent du matériau du corps du segment (11, 21) est placée sur le corps (11, 21) annulaire dans la région de chaque extrémité de la coupe (15, 16; 25, 26) du segment de piston et le matériau desdites parties (17, 18; 27, 28) présente un coefficient de dilatation thermique plus faible que le matériau (11, 21) du corps annulaire.
PCT/DE2008/001005 2007-06-28 2008-06-12 Segment de piston WO2009000245A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007029992A DE102007029992A1 (de) 2007-06-28 2007-06-28 Kolbenring
DE102007029992.5 2007-06-28

Publications (1)

Publication Number Publication Date
WO2009000245A1 true WO2009000245A1 (fr) 2008-12-31

Family

ID=39840825

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2008/001005 WO2009000245A1 (fr) 2007-06-28 2008-06-12 Segment de piston

Country Status (3)

Country Link
CN (1) CN201269146Y (fr)
DE (1) DE102007029992A1 (fr)
WO (1) WO2009000245A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010047836B4 (de) * 2010-10-07 2014-09-04 Federal-Mogul Burscheid Gmbh Verfahren zur Herstellung eines Kolbenrings
DE102011076453B4 (de) * 2011-05-25 2013-08-01 Federal-Mogul Burscheid Gmbh Kolbenring mit Verbundbeschichtung
DE102012002443A1 (de) * 2012-02-08 2013-08-08 Mahle International Gmbh Kolbenring für einen Verbrennungsmotor
BR102013019686B1 (pt) * 2013-08-01 2020-11-03 Mahle Metal Leve S/A anel de pistão e seu processo de fabricação
CN104358621A (zh) * 2014-09-30 2015-02-18 仪征亚新科双环活塞环有限公司 一种变径向厚度活塞环
CN109268166B (zh) * 2018-08-23 2020-06-23 贵州吉利发动机有限公司 一种活塞环

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497102A (en) * 1983-07-01 1985-02-05 Nippon Piston Ring Co., Ltd. Process for manufacturing a piston ring
DE3444456C1 (de) * 1984-12-06 1985-12-19 M.A.N.-B & W Diesel GmbH, 8900 Augsburg Geschlitzter Kolbenring, insbesondere für schwerölbetriebene Zweitakt-Großmotoren
EP0253069A1 (fr) * 1986-04-14 1988-01-20 Friedhelm Stecher Segment de piston optimisé, en fonction des lois de la tribologie
JPH0666371A (ja) * 1992-08-19 1994-03-08 Kawasaki Heavy Ind Ltd エンジンのピストンリング
DE10041802C1 (de) * 2000-08-25 2002-02-28 Federal Mogul Burscheid Gmbh Kompressionskolbenring

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1241836A (en) * 1916-04-18 1917-10-02 Louis De F Munger Piston-ring.
GB781957A (en) * 1954-09-01 1957-08-28 Heinz Teves Piston ring for internal combustion engines, compressors or other reciprocating engines
DE19741598A1 (de) * 1997-09-20 1999-03-25 Schaeffler Waelzlager Ohg Dichtring zwischen einem rotierenden und einem feststehenden Bauteil, insbesondere zwischen einer Anschlußkonsole und einem Ventilblock einer hydraulischen Nockenwellen-Verstelleinrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497102A (en) * 1983-07-01 1985-02-05 Nippon Piston Ring Co., Ltd. Process for manufacturing a piston ring
DE3444456C1 (de) * 1984-12-06 1985-12-19 M.A.N.-B & W Diesel GmbH, 8900 Augsburg Geschlitzter Kolbenring, insbesondere für schwerölbetriebene Zweitakt-Großmotoren
EP0253069A1 (fr) * 1986-04-14 1988-01-20 Friedhelm Stecher Segment de piston optimisé, en fonction des lois de la tribologie
JPH0666371A (ja) * 1992-08-19 1994-03-08 Kawasaki Heavy Ind Ltd エンジンのピストンリング
DE10041802C1 (de) * 2000-08-25 2002-02-28 Federal Mogul Burscheid Gmbh Kompressionskolbenring

Also Published As

Publication number Publication date
DE102007029992A1 (de) 2009-01-08
CN201269146Y (zh) 2009-07-08

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