EP2243940A1 - Reduziereinrichtung zur Reduzierung eines Gasdrucks auf ein Kolbenringpaket einer Hubkolbenbrennkraftmaschine - Google Patents

Reduziereinrichtung zur Reduzierung eines Gasdrucks auf ein Kolbenringpaket einer Hubkolbenbrennkraftmaschine Download PDF

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Publication number
EP2243940A1
EP2243940A1 EP10155915A EP10155915A EP2243940A1 EP 2243940 A1 EP2243940 A1 EP 2243940A1 EP 10155915 A EP10155915 A EP 10155915A EP 10155915 A EP10155915 A EP 10155915A EP 2243940 A1 EP2243940 A1 EP 2243940A1
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EP
European Patent Office
Prior art keywords
piston
piston crown
ring
cylinder
reduction device
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Withdrawn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
EP10155915A
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German (de)
English (en)
French (fr)
Inventor
Konrad Räss
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.)
Wartsila NSD Schweiz AG
Original Assignee
Wartsila NSD Schweiz AG
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 Wartsila NSD Schweiz AG filed Critical Wartsila NSD Schweiz AG
Priority to EP10155915A priority Critical patent/EP2243940A1/de
Publication of EP2243940A1 publication Critical patent/EP2243940A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F2001/006—Cylinders; Cylinder heads  having a ring at the inside of a liner or cylinder for preventing the deposit of carbon oil particles, e.g. oil scrapers

Definitions

  • the invention relates to a reducing device for reducing a gas pressure on a piston ring assembly of a reciprocating internal combustion engine, a piston, a removable scraper ring and a cylinder, and a reciprocating internal combustion engine, in particular two-stroke large diesel engine according to the preamble of the independent claims.
  • pistons for reciprocating internal combustion engines such as two-stroke large diesel engines, especially for longitudinally purged two-stroke large diesel engines, are usually equipped with a pack of several, each in a piston ring groove, stacked piston rings.
  • the known piston ring packings comprise at least two piston rings, but usually three, four or even five piston rings, depending on the size of power or type of reciprocating internal combustion engine or depending on the requirements and the specific operating conditions under which the machine is operated.
  • the piston rings fulfill very different functions, such as the distribution and / or stripping of a lubricant on the running surface of the cylinder, the sealing of the combustion chamber against the crankcase, or in the case of longitudinally flushed two-stroke large diesel engines, the seal against the receiver room, etc. ,
  • Typical of longitudinally purged two-stroke large diesel engines is the use of a piston ring packing consisting of four or five piston rings for sealing the combustion chamber against the piston bottom, which is directed against the receiver chamber from the beginning of the rinse phase fresh air flows through the scavenging slots into the combustion chamber of the cylinder.
  • the lower piston rings are more or less heavily loaded. In this case, various instabilities between the lower piston rings can occur, which can for example lead to pressure fluctuations, which in turn cause instabilities in the piston stroke, because there are too many piston rings that have similar or the same functions.
  • the complex problem of cylinder lubrication engines is getting bigger and bigger Significance, in particular in large diesel engines, the cylinder lubrication is carried out by lubricating devices in the reciprocating piston or realized by provided in the cylinder wall lubricating oil nozzles.
  • combustion residues which can be deposited at various points in the engine.
  • combustion residues represent a significant problem, since the fuel used, namely the heavy oil is loaded with many substances that can lead to solid, liquid and gaseous combustion residues of all kinds that in particular at the piston, at the Kolberingnuten, especially on the piston crown or on the cylinder, preferably in the vicinity of the top dead center can settle.
  • the anti-polishing ring in the upper part of the cylinder liner.
  • This ring may for example be designed as a thin-walled sleeve with a rectangular cross section, which usually has a smaller inner diameter than that of the cylinder itself.
  • the inner diameter of the antipolishing ring depends on the diameter of the piston crown, specifically according to their maximum diameter during engine operation. Therefore, the goal of the known antipolishing rings is to make the inner diameter so narrow that the gap between the piston crown and the antipolishing ring is as small as possible, but the piston crown does not mechanically touch the antipolishing ring in direct contact.
  • the design of the Antipolishing Ring must obey many compromises. At low loads and colder piston crown is the game, so the distance between the piston crown and anti-polishing ring alone due to thermal expansion effects greater than at high loads. It should also be borne in mind that in general, the various components in the cylinder, such as the cylinder surface, the piston, in particular the piston rings, the piston ring but also the piston crown wear differently in the circumferential direction as well as in the longitudinal direction, depending on the number of operating hours and thus have no fixed diameter.
  • the object of the invention is therefore to provide a device by means of which an improved seal between the combustion chamber and the piston underside, in particular in the vicinity of the top dead center of the piston can be achieved.
  • the gas pressure acting on the Kolberingun of the piston in the operating state regardless of the operating state or the state of wear of the components involved automatically reach an optimal seal between piston crown and anti-polishing ring in the vicinity of the top dead center of the piston is.
  • the invention thus relates to a reducing device for reducing a gas pressure, which acts in the operating state of a reciprocating internal combustion engine on a arranged in an annular region of a piston piston ring packing.
  • the piston comprises a piston crown adjacent to the annular region, which in the installed state faces a combustion chamber of the reciprocating internal combustion engine.
  • the piston is in Operational state along a longitudinal axis of a cylinder arranged such reciprocable that the piston crown of the piston in the vicinity of a top dead center of its movement in the cylinder cooperates with a provided on a cylinder wall of the stripping stripping device for controlled removal of combustion residues, wherein the reducing device in the form of Recess designed, so that a controlled deposition of the combustion residues on the reducer can be achieved.
  • the stripping device and the piston crown are configured and arranged relative to one another such that they are inclined relative to one another at least in sections at a predetermined angle, so that in the vicinity of the top dead center in the interaction of the piston crown with the stripping a reduction of the on the Piston ring packing acting gas pressure is automatically adjustable.
  • standstill temperature is to be understood as the temperature that the engine assumes after a sufficiently long wait in the non-operating state.
  • the standstill temperature is essentially the ambient temperature when the engine is shut down long enough and has substantially assumed the temperature of the environment.
  • the ambient temperature is thus the operating temperature of the engine or the various parts of the engine to see, and, as is well known in the art, the operating temperature is that temperature that assume the engine or the individual parts of the engine in the operating state.
  • Essential to the invention are thus the advantages of the changing cross section between the cylinder or the stripping or reducing device and the piston crown.
  • the components stripping means and piston crown are shaped so that they are in the cold state, i. not parallel to each other at the standstill temperature.
  • the opposing surfaces of scraper or reducer and piston crown can also be provided, for example, as a crowned, wavy, or stepped shape.
  • the piston crown preferably has a conical shape tapering towards the combustion chamber, and the scraper ring has a shape closing towards the combustion chamber, or vice versa, depending on the deformation trend.
  • the piston crown has a varying cross section.
  • a particular advantage of the invention is that the components heat up during operation, so that the surfaces that can be designed with or without profiling in the form of recesses, such as in the form of grooves, in an optimal manner and thus thus set a desired sealing effect, for example in the labyrinth of the recesses with or without deposited contamination.
  • a specially enlarging cross-section opening towards the combustion chamber causes a faster deposition of soot particles which deposit on account of the expected higher temperatures and the larger cross-section.
  • the tapering or widening cross-sectional areas preferably have angles to the vertical, that is, with respect to the longitudinal axis of the cylinder, from about 0.238 ° to 0.7 °.
  • the inner diameter of the antipolishing ring is provided with a number of circumferential grooves or a more or less fine thread.
  • the function of such or geometrically differently shaped recesses is, inter alia, that a labyrinth effect can be generated, which has a sealing effect in a conventional manner and so a flow of fuel gases along the piston crown toward the piston ring package and beyond in an area below the Pistons at least greatly reduced. This also reduces the maximum pressure acting on the piston ring package.
  • the thus coated with combustion residues surface of the piston crown and / or the anti-polishing ring reduces the inner diameter of the anti-polishing ring or the outer diameter of the piston crown and thus reduces the distance, ie the gap between the anti-polishing ring and piston crown.
  • the distance between the antipolishing ring and the piston crown is thus automatically adjusted to an optimum value in the operating state by the present invention.
  • the relatively soft deposits of combustion residues on the antipolishing ring and / or on the piston crown by their relative movement stripped against each other so that automatically adjusts an optimal distance between the anti-polishing ring and piston crown, or between the surfaces of the deposits on one or both of these components.
  • the relatively soft deposits of combustion residues on the antipolishing ring and / or on the piston crown by their relative movement stripped against each other so that automatically adjusts an optimal distance between the anti-polishing ring and piston crown, or between the surfaces of the deposits on one or both of these components.
  • the recess is provided on the stripping device, which is preferably an antipolishing ring.
  • the recess according to the invention can additionally or alternatively advantageously also be provided on the piston crown.
  • the recess can be made quite different depending on the requirements in the concrete.
  • the recess may e.g. consist of a field of wells, which can be provided either by an ordered pattern or even after a random, preferably uniform distribution of the piston ring crown or on the stripping device, so the antipolishing ring.
  • the recess is in the form of a circumferential with respect to the longitudinal axis of the cylinder groove and / or the recess is in the form of a helical with respect to the longitudinal axis of the cylinder groove formed, wherein both types of grooves can of course also be provided in one and the same example in combination. It is understood that preferably a plurality of circumferential grooves is provided.
  • the stripping device is dismantlable, i. replaceable wiper ring provided on the cylinder wall.
  • the removable stripping device can have a constant cross section with respect to the longitudinal axis of the cylinder, that is to say the cross section of the antipolishing ring is particularly preferably rectangular.
  • the antipolishing ring e.g. adapted to the geometry of the piston crown and has a non-constant, changing cross-section.
  • the antipolishing ring has a cross-sectional shape corresponding to a cross section of the piston crown, e.g. a substantially triangular cross-sectional shape or other suitable cross-sectional shape.
  • the recess may be provided on a removable piston crown ring. That is, on the piston crown can be provided corresponding to the anti-polishing ring a replaceable piston crown ring, which is welded, for example, with the piston crown, is clamped under great mechanical stress on the Kolbekrone or securely attached to the Kolbekrone in another suitable manner. Then it is sufficient in certain cases, only replace the piston crown ring instead of the entire piston which, especially spare parts and thus further costs.
  • the recess of the present invention has a maximum depth of 0.1 mm to 5 mm, preferably between 0.5 mm and 3 mm, wherein for example in groove-shaped recesses, the number of recesses between 1 / cm and 15 / cm, in particular between 4 / cm and 10 / cm, or wherein the number of area-distributed recesses between 1 / cm 2 and 15 / cm 2 , in particular between 4 / cm 2 and 10 / cm 2 .
  • the invention further relates to a piston, a removable scraper ring and a removable piston crown ring with a reducing device of the present invention, and a cylinder and a piston with a removable scraper ring and a removable piston crown ring.
  • the invention relates to a reciprocating internal combustion engine, in particular a two-stroke large diesel engine with a reducing device and / or with a piston and / or a cylinder as described in detail in this application.
  • Fig. 1a to Fig. 3 each show in a schematic representation partially and in section a cylinder arrangement with a reducing device according to the present invention, which reduction device is hereinafter referred to collectively with the reference numeral 1.
  • Fig. 1a to Fig. 3 show, apart from the inventive reducing device 1, 100 is a known cylinder arrangement of a reciprocating internal combustion engine, in the present particular example of a two-stroke crosshead diesel engine, with a cylinder 4, in which a piston 2 is arranged, in a Ring portion 21 a piston ring package 22 is provided with three piston rings is. It is understood that the ring package 22 may also include more or less than three piston rings.
  • a gas pressure P which has been established in the combustion chamber 3 during a compression stroke of the piston 2 or by the ignition of a combustion mixture in the combustion chamber 3, acts on the piston ring packing 22, which is arranged below a piston crown 23 facing a combustion chamber 3.
  • the piston 2 is arranged in a well-known manner in the operating state along a longitudinal axis L of the cylinder 4 back and forth such that the piston crown 23 of the piston 2 in the vicinity of a top dead center OT its movement in the cylinder 4 with a on a cylinder wall 41 of the Cylinder 4 provided scraper 5 cooperates to strip combustion residues 6.
  • the reducing device 1 in the form of a recess 100 is provided and configured in such a way that a controlled deposition of the combustion residues 6 at the reducing device can be achieved, and in the vicinity of the top dead center OT during cooperation of the piston crown 23 with the stripping device 5, which is here an antipolishing ring 5, a reduction of the force acting on the piston ring packing 22 gas pressure P is automatically adjustable.
  • the inventive reducing device 1 in the form of a helically around the longitudinal axis L circumferential groove 100 is formed. It shows the Fig. 1a a state before the first start of the Cylinder 4 after a repair. Therefore, neither on the piston crown 23 nor on the stripping means 5 with the helical groove 100 any deposits of combustion residues 6 are present.
  • Fig. 1b shows the cylinder arrangement of the Fig. 1a after a certain number of operating hours.
  • combustion residues 6 have now clearly deposited on the removable scraper ring 5.
  • the combustion residues 6 on the piston crown 23 facing surface by the interaction with the piston crown 23 during the reciprocation of the piston 2 in the vicinity of the top dead center OT are shaped such that the surface of the combustion residues 6 more or less positively with the corresponding surface of the piston crown 23 cooperates.
  • Daurch on the one hand we achieved an optimal sealing effect between the scraper ring 5 and piston crown.
  • we maintain this optimal seal even if, for example due to load or temperature fluctuations, the outer diameter of the piston crown 23 and / or inner diameter of the scraper ring 5 changes.
  • Fig. 2a and Fig. 2b is different from the Fig. 1a and Fig. 1b mainly in that the inventive reducing device 1 is not provided on the stripping device 5 but on the piston crown 23.
  • the recesses 100 are not formed here in the form of circumferential grooves, but distributed in the form of more or less uniformly distributed recesses 100, such as in the form of small pits 100 over the surface of the piston crown 23.
  • the Fig. 3 shows a very specific embodiment of the present invention, in which both on the scraper ring 5 and on the piston crown 23, a reduction device 1, 100 according to the invention in the form of recesses 100 is provided.
  • a removable piston crown ring 7 is provided on the piston crown 23, so that, for example, when the reducing device 1, 100 worn on the piston crown 23, not the entire piston 2 must be replaced, but only the piston crown ring 7. This was the cylinder assembly of the Fig. 3 not yet put into operation; Thus, no deposits of combustion residues 6 are present. In operation, the combustion residues will gradually attach to both the piston crown 23, and on the scraper ring 5, until finally a positive seal is formed.
  • Fig. 3 is particularly well suited for applications in which relatively little deposits arise, so that the here double-acting labyrinth seal, which is provided both on the piston crown 23 and the scraper ring 5, comes particularly strong to bear, so even without significant deposits of combustion residues 6 already compared to the state of the art massively improved sealing effect between piston crown 23 and scraper ring 5 is guaranteed.
  • stripping 5 or reducing 1 and piston crown 23 are shaped so that they are not parallel to each other, especially in the cold state.
  • the opposing surfaces of stripping device 5 or reducing device 1 and piston crown 23 can also be provided, for example, as a crowned, wave-shaped, or stepped shape.
  • the piston crown 23 has according to the embodiment of Fig. 4a a conical shape tapering towards the combustion chamber 3, and the scraper ring 5 a form closing towards the combustion chamber 5, or else it may be reversed in another embodiment not explicitly shown here, depending on the deformation trend.
  • the components heat up during operation, so that the surfaces which can be embodied with or without profilings 100 in the form of recesses 100, for example in the form of grooves 100 , in an optimal manner, and thus a desired sealing effect, for example, in the labyrinth of the recesses 100 with or without deposited contamination 6 sets.
  • opening in the special enlarging cross section towards the combustion chamber 3 causes a faster deposition 6 of soot particles which deposit due to the higher temperatures to be expected and the larger cross section.
  • the tapered or widening cross sectional areas in the Fig. 4a - 4c preferably have an angle to the vertical, ie with respect to the longitudinal axis L of the cylinder 4 of about 0.238 ° to 0.7 °.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP10155915A 2009-04-06 2010-03-09 Reduziereinrichtung zur Reduzierung eines Gasdrucks auf ein Kolbenringpaket einer Hubkolbenbrennkraftmaschine Withdrawn EP2243940A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10155915A EP2243940A1 (de) 2009-04-06 2010-03-09 Reduziereinrichtung zur Reduzierung eines Gasdrucks auf ein Kolbenringpaket einer Hubkolbenbrennkraftmaschine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09157367 2009-04-06
EP10155915A EP2243940A1 (de) 2009-04-06 2010-03-09 Reduziereinrichtung zur Reduzierung eines Gasdrucks auf ein Kolbenringpaket einer Hubkolbenbrennkraftmaschine

Publications (1)

Publication Number Publication Date
EP2243940A1 true EP2243940A1 (de) 2010-10-27

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Application Number Title Priority Date Filing Date
EP10155915A Withdrawn EP2243940A1 (de) 2009-04-06 2010-03-09 Reduziereinrichtung zur Reduzierung eines Gasdrucks auf ein Kolbenringpaket einer Hubkolbenbrennkraftmaschine

Country Status (5)

Country Link
EP (1) EP2243940A1 (ko)
JP (1) JP2010242761A (ko)
KR (1) KR20100111248A (ko)
CN (1) CN101858276A (ko)
BR (1) BRPI1000986A2 (ko)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2602453A1 (de) * 2011-12-07 2013-06-12 Wärtsilä Schweiz AG Kolben und Zylinderanordnung für eine Hubkolbenbrennkraftmaschine, sowie Verfahren zur Entfernung einer Ablagerung von einem Kolben
WO2014195288A1 (de) * 2013-06-05 2014-12-11 Man Diesel & Turbo Se Kolben einer brennkraftmaschine
EP3192994A3 (en) * 2016-01-15 2017-08-16 Caterpillar Energy Solutions GmbH Turbulators for an internal combustion engine
DE102019122878A1 (de) * 2019-08-27 2021-03-04 Man Energy Solutions Se Kolben und Zylinder einer Brennkraftmaschine und Brennkraftmaschine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2479413A1 (de) * 2011-01-24 2012-07-25 Wärtsilä Schweiz AG Kolben für eine Hubkolbenbrennkraftmaschine
CN105041470A (zh) * 2015-07-31 2015-11-11 广西玉柴机器股份有限公司 柴油机刮碳环装置
DE102016007727A1 (de) * 2016-06-23 2017-12-28 Man Truck & Bus Ag Brennkraftmaschine, insbesondere Hubkolben-Brennkraftmaschine
CN107956594B (zh) * 2017-10-31 2019-06-25 贵州吉利发动机有限公司 一种发动机结构
JP7157262B2 (ja) * 2020-08-25 2022-10-19 Ｔｐｒ株式会社 シリンダライナ用遮熱リングおよび内燃機関

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476099A (en) * 1968-02-26 1969-11-04 Int Harvester Co Head,gasket,and protector assembly and method
US4474147A (en) * 1981-12-10 1984-10-02 Mack Trucks, Inc. Combined fire ring and carbon scraping insert
DE3530875A1 (de) * 1985-08-29 1987-03-05 Mak Maschinenbau Krupp Brennkraftmaschine mit laufbuchsenzwischenstueck
WO1997003280A1 (en) * 1995-07-07 1997-01-30 Man B & W Diesel A/S An internal combustion engine having a coke scraping ring in a cylinder
EP0995890A1 (de) * 1998-10-20 2000-04-26 Wärtsilä NSD Schweiz AG Zylinder für eine Brennkraftmaschine
EP1679434A1 (en) * 2003-10-16 2006-07-12 Kabushiki Kaisha Riken Internal combustion engine and liner installation ring

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476099A (en) * 1968-02-26 1969-11-04 Int Harvester Co Head,gasket,and protector assembly and method
US4474147A (en) * 1981-12-10 1984-10-02 Mack Trucks, Inc. Combined fire ring and carbon scraping insert
DE3530875A1 (de) * 1985-08-29 1987-03-05 Mak Maschinenbau Krupp Brennkraftmaschine mit laufbuchsenzwischenstueck
WO1997003280A1 (en) * 1995-07-07 1997-01-30 Man B & W Diesel A/S An internal combustion engine having a coke scraping ring in a cylinder
EP0995890A1 (de) * 1998-10-20 2000-04-26 Wärtsilä NSD Schweiz AG Zylinder für eine Brennkraftmaschine
EP1679434A1 (en) * 2003-10-16 2006-07-12 Kabushiki Kaisha Riken Internal combustion engine and liner installation ring

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2602453A1 (de) * 2011-12-07 2013-06-12 Wärtsilä Schweiz AG Kolben und Zylinderanordnung für eine Hubkolbenbrennkraftmaschine, sowie Verfahren zur Entfernung einer Ablagerung von einem Kolben
WO2014195288A1 (de) * 2013-06-05 2014-12-11 Man Diesel & Turbo Se Kolben einer brennkraftmaschine
CN105247197A (zh) * 2013-06-05 2016-01-13 曼柴油机和涡轮机欧洲股份公司 内燃机的活塞
EP3192994A3 (en) * 2016-01-15 2017-08-16 Caterpillar Energy Solutions GmbH Turbulators for an internal combustion engine
DE102019122878A1 (de) * 2019-08-27 2021-03-04 Man Energy Solutions Se Kolben und Zylinder einer Brennkraftmaschine und Brennkraftmaschine
US11193447B2 (en) 2019-08-27 2021-12-07 Man Energy Solutions Se Piston and cylinder of an internal combustion engine and internal combustion engine

Also Published As

Publication number Publication date
JP2010242761A (ja) 2010-10-28
CN101858276A (zh) 2010-10-13
BRPI1000986A2 (pt) 2012-01-24
KR20100111248A (ko) 2010-10-14

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