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WO2004090389A1 - Segment de piston pour moteur a combustion interne - Google Patents

Segment de piston pour moteur a combustion interne Download PDF

Info

Publication number
WO2004090389A1
WO2004090389A1 PCT/EP2003/003719 EP0303719W WO2004090389A1 WO 2004090389 A1 WO2004090389 A1 WO 2004090389A1 EP 0303719 W EP0303719 W EP 0303719W WO 2004090389 A1 WO2004090389 A1 WO 2004090389A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
piston
face
piston ring
partition
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.)
Ceased
Application number
PCT/EP2003/003719
Other languages
English (en)
Inventor
Jesper Weis Fogh
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.)
MAN B&W Diesel AS
Original Assignee
MAN B&W Diesel AS
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 MAN B&W Diesel AS filed Critical MAN B&W Diesel AS
Priority to PCT/EP2003/003719 priority Critical patent/WO2004090389A1/fr
Priority to AU2003239800A priority patent/AU2003239800A1/en
Publication of WO2004090389A1 publication Critical patent/WO2004090389A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F16J9/12—Details
    • F16J9/14—Joint-closures
    • 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
    • F16J9/22—Rings for preventing wear of grooves or like seatings

Definitions

  • the present invention relates to a piston ring for use in an annular groove of a piston of a large two-stroke internal combustion engine, particularly a uniflow-scavenged crosshead engine.
  • the piston ring has an upper ring face and a lower ring face and a ring partition allowing expansion and contraction of the piston ring for adjustment of the ring diameter during engine operation and at the mounting in the annular groove.
  • the invention relates to a large two- stroke internal combustion engine, particularly a uniflow- scavenged crosshead engine, comprising a plurality of pistons having in their peripheral surface several axially separated annular grooves with a piston ring mounted therein.
  • the invention also relates to a method for treating a piston ring for use in an annular groove of a piston of a large two-stroke internal combustion engine.
  • the wear is mainly 3 -part abrasive which means that the rate of wear is directly dependent on the amount of relative movement and the surface pressure between the parts. It has also been realized that the expanding and retracting movement of the piston ring causes practically no movement between the annular groove and piston ring in the part of the ring opposite to the ring partition, since the part opposite to the ring partition acts as a flexible hinge, and is thus practically not moving when the piston ring expands and retracts. Most of the relative movement takes therefore place at the part of the ring closest to the ring partition. Thus, most of the wear to the chrome plating on the lower groove face takes place in the area around the ring partition, wherever it happens to be.
  • the wear rate of the chrome plating on the lower groove face can be reduced by changing the properties of the lower ring face in the area of the ring partition.
  • a wear resistant coating such as a chrome plating
  • This combination is particularly suitable for resisting 3 -part abrasive wear. The wear to the lower groove face can thus be significantly reduced.
  • the wear resistant coating may also comprise hard particles dispersed in a metal matrix.
  • the metal matrix can be formed by a chrome or nickel based material.
  • the hard particles are typically different metal carbides, oxides or silicates, such as titanium carbides, aluminum oxides, wolfram carbides, chrome oxides, and vanadium carbides.
  • the wear resistant coating needs to extend tangentially from both sides of the ring partition for approximately 30° to 60°, though preferably at least approximately 45°.
  • the ring partition can be of the type that is substantially gastight and provided with several leakage tracks formed in the lower ring face or in the periphery of the piston ring.
  • the ring partition can be a simple radial slit.
  • This object is achieved in accordance with claim 6 by providing a part of the lower ring face proximate to the ring partition with a wear resistant coating, preferably a hard plating.
  • This object is achieved in accordance with claim 8 by providing a method comprising the steps of suspending the piston ring from a suspension member with the upper and lower ring faces arranged substantially vertically and the ring partition arranged down, lowering the piston ring into an electrolytic coating bath until a part of lower ring face proximate to the ring partition is submerged, electrolytically depositing a wear resistant coating on the submerged part of the piston ring, and raising the piston ring up from the electrolytic coating bath.
  • the electrolytically deposited wear resistant coating preferably has a thickness between 0,05 mm and 0,5 mm.
  • Fig. 1 shows part of a cross-section through piston rings according to the invention arranged in annular grooves in a piston arranged in a cylinder
  • Fig. 2 is a plane top view of a piston ring according a first preferred embodiment of the invention
  • Fig. 3 is a plane side view of a piston ring according to a first preferred embodiment of the invention
  • Fig. 4 is a cross-section on a larger scale of a piston ring inserted in an annular groove
  • Fig. 5 illustrates diagrammatically the movements of the different parts of the piston ring according to the invention.
  • Fig. 7 is a plane top view of a piston ring according to a second embodiment of the invention.
  • Fig. 1 shows a piston 1 mounted in a cylinder liner 2.
  • the piston has several axially separated annular grooves 3, each as shown in Fig . 4 , having an upper groove face 4 , a lower groove face 5 and a groove bottom 6.
  • the lower groove face 5 is coated with a layer of chrome 10 to form a hard surface that is resistant to 3 -part abrasive wear. If the up to approximately 1 mm thick layer of chrome should however get worn the piston 1 needs to be removed from the engine to apply a new layer of chrome .
  • the lower groove face 5 has to be machined before and after applying the new chrome layer .
  • the piston rings 7 are inserted in the annular grooves to prevent the gas pressure in the working chamber 11 above the piston 1 from spreading to the space below the piston.
  • the piston ring 7 has a ring partition 9 formed by a simple radial cut rendering it possible to expand the ring diameter when mounting in the annular groove 3 and permitting the piston ring to expand and contract to adapt the ring outer diameter to the inner diameter of the cylinder liner 2 as the piston 1 moves up and down.
  • the ring partition 9 also allows the two ends of the ring at the partition to pull away from each other as the ring gets worn.
  • Figs. 2 and 3 show the piston ring 7 according to a first preferred embodiment in greater detail.
  • the ring has a lower ring face 15 and an upper ring face 16.
  • the lines 18 and 19 shown in Fig. 2 demarcate the part of the lower ring face that is coated with a layer of chrome 17 to improve the hardness of the face material and to create a face material combination that is particularly durable.
  • the thickness of the coating is typically between 0,05 and 0,5 mm.
  • the coated area extends in both directions for about 45° from the ring partition. It is understood though that is possible to cover a smaller area or a larger area with chrome plating, depending on circumstances such as load conditions and the amount of abrasive particles to which the piston ring and the annular groove are exposed. It is also possible to use other coating materials, such as nickel based alloys, i.e. a nickel-cobalt alloy. Electrolytically applied coatings that give a high surface hardness are however preferred.
  • the wear resistant coating can alternatively be formed by hard particles dispersed in a metal matrix (not shown) .
  • the metal matrix can be formed by a chrome or nickel based material.
  • the hard particles are typically different metal carbides, oxides or silicates, such as titanium carbides, aluminum oxides, wolfram carbides, chrome oxides and vanadium carbides.
  • Fig. 7 shows an another preferred embodiment of the piston ring according to the invention.
  • the ring partition 9 in this embodiment formed by mutually overlapping tongues which bar a major part of the gap to form a largely gastight partition.
  • the piston ring 7 has several leakage grooves 14 in its lower surface 15. In the example shown in Fig. 7, the ring has ten leakage tracks 14, evenly distributed over the periphery of the ring. Alternatively, the leakage tracks can be formed in the periphery of the piston ring (not shown) .
  • the lines 18 and 19 shown in Fig. 7 demarcate the part of the lower ring face that is coated with a layer of chrome 17 to improve the hardness of the face material. The coated area extends in both directions for about 45° from the ring partition, but the extend of the coated area can be adjusted in accordance with circumstances .
  • the piston rings according to the invention are applicable for internal combustion engines of both the two-stroke and the four-stroke type, but they are especially advantageous in large two-stroke crosshead engines with uniflow scavenging, viz. with scavenging air ports in the lower section of the cylinder liner and an exhaust valve in the cylinder cover.
  • Such engines may, for example, have cylinder diameters in the interval from 250 to 1000 mm, and stroke lengths in the interval from 900 to 2400 mm, and they can be operated at very high mean pressures in the interval from 16 to 20 bar, which results in large loads on the piston rings.
  • the piston ring according to the invention renders it possible to achieve long life for piston rings and the ring groove despite the high load on the rings.

Landscapes

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

Abstract

A L'invention concerne un segment de piston (7) utilisable dans une rainure annulaire (3) d'un piston (1) d'un gros moteur à combustion interne à deux temps, en particulier, d'un moteur à crosse, à balayage en équicourant. Le segment de piston (7) présente une face annulaire supérieure (16) et une face annulaire inférieure (15) et une séparation annulaire (9) permettant la dilatation et la contraction du segment (7) pour l'ajustement du diamètre du segment durant le fonctionnement du moteur, ainsi qu'au montage dans la rainure annulaire (3). Une partie de la face annulaire inférieure (15) à proximité de la séparation annulaire (9) est munie d'un revêtement résistant à l'usure, destiné à réduire l'usure du revêtement de la face annulaire inférieure. L'invention concerne en outre un procédé de traitement d'un segment de piston (7) utilisable dans une rainure annulaire d'un piston d'un gros moteur à combustion interne à deux temps. Le segment de piston (7) est partiellement immergé dans un bain de revêtement catalytique (20).
PCT/EP2003/003719 2003-04-10 2003-04-10 Segment de piston pour moteur a combustion interne Ceased WO2004090389A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2003/003719 WO2004090389A1 (fr) 2003-04-10 2003-04-10 Segment de piston pour moteur a combustion interne
AU2003239800A AU2003239800A1 (en) 2003-04-10 2003-04-10 A piston ring for an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2003/003719 WO2004090389A1 (fr) 2003-04-10 2003-04-10 Segment de piston pour moteur a combustion interne

Publications (1)

Publication Number Publication Date
WO2004090389A1 true WO2004090389A1 (fr) 2004-10-21

Family

ID=33154986

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/003719 Ceased WO2004090389A1 (fr) 2003-04-10 2003-04-10 Segment de piston pour moteur a combustion interne

Country Status (2)

Country Link
AU (1) AU2003239800A1 (fr)
WO (1) WO2004090389A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2551504A1 (fr) * 2011-07-25 2013-01-30 Wärtsilä Schweiz AG Piston et segment répartiteur d'huile pour moteur à combustion interne à piston élévateur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011295A1 (fr) 1995-09-22 1997-03-27 Man B & W Diesel A/S Segment de piston pour piston de moteur a combustion interne
DE19833825C1 (de) * 1998-07-28 1999-12-16 Man B & W Diesel Ag Kolben für eine Hubkolbenbrennkraftmaschine
DE19857637A1 (de) * 1998-12-14 2000-06-15 Mahle Gmbh Kolbenring für einen Kolben für Verbrennungsmotoren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011295A1 (fr) 1995-09-22 1997-03-27 Man B & W Diesel A/S Segment de piston pour piston de moteur a combustion interne
DE19833825C1 (de) * 1998-07-28 1999-12-16 Man B & W Diesel Ag Kolben für eine Hubkolbenbrennkraftmaschine
DE19857637A1 (de) * 1998-12-14 2000-06-15 Mahle Gmbh Kolbenring für einen Kolben für Verbrennungsmotoren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2551504A1 (fr) * 2011-07-25 2013-01-30 Wärtsilä Schweiz AG Piston et segment répartiteur d'huile pour moteur à combustion interne à piston élévateur

Also Published As

Publication number Publication date
AU2003239800A1 (en) 2004-11-01

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