EP2602453A1 - Piston and cylinder assembly for a reciprocating compressor combustion machine and method for removing deposits from a piston - Google Patents
Piston and cylinder assembly for a reciprocating compressor combustion machine and method for removing deposits from a piston Download PDFInfo
- Publication number
- EP2602453A1 EP2602453A1 EP11192378.5A EP11192378A EP2602453A1 EP 2602453 A1 EP2602453 A1 EP 2602453A1 EP 11192378 A EP11192378 A EP 11192378A EP 2602453 A1 EP2602453 A1 EP 2602453A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- ring
- recess
- dead center
- cylinder liner
- 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.)
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000008021 deposition Effects 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims description 12
- 238000012856 packing Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 abstract 1
- 230000006378 damage Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000002000 scavenging effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000254 damaging effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000009528 severe injury Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
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- 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
- F02F3/00—Pistons
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- 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
- F02F3/00—Pistons
- F02F3/28—Other pistons with specially-shaped head
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- 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
- F02F5/00—Piston rings, e.g. associated with piston crown
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- 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 piston and a cylinder arrangement for a reciprocating internal combustion engine, in particular two-stroke large diesel engine, and a method for removing a deposit from a lateral surface of a piston according to the preamble of independent claims 1, 9 and 14.
- the piston known from the prior art 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, in each case a Kolbenringnute, 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, power, or design of the reciprocating internal combustion engine or depending on 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 may occur, which may 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.
- 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, it is the objective of the known antipolishing rings to make the inner diameter so narrow that the gap between the piston crown and the antipolishing ring is as small as possible Piston crown but not in direct contact mechanically strips the antipolishing ring.
- 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 really tight diameter.
- a hitherto unresolved problem in this context is that the antipolishing ring, often abbreviated abbreviated to APR, not quite close to the top of the piston ring package, so not quite reach up to the top ring of the piston ring package in the top dead center of the piston because Otherwise, the anti-polishing ring could come into contact with the top ring, which could lead to massive damage, in the worst case to the destruction of the top ring, or even severe damage to the piston itself, which even the failure of a cylinder or worst of the case entire engine can result.
- APR antipolishing ring
- Fig. 1 shows a well-known from the prior art piston 1 'of a two-stroke large diesel engine, as used for example in large container ships.
- the two-stroke large diesel engine usually has several cylinder liners in Fig. 1 for reasons of clarity are not shown, in which cylinder liners each piston top 1011 'of the piston 1' in the installed state limits a combustion chamber VB ', the piston 1' along a piston axis A 'in the cylinder liner between a top dead center and a bottom dead center in the axial Direction is arranged to move back and forth.
- a piston ring packing 4 ' is formed which at least one of the piston top side 1011' is adjacent to it as top ring 41 'designed piston ring comprises.
- the object of the invention is therefore to provide a piston, a cylinder arrangement and a method for removing deposits from a lateral surface of a piston, so that the problems with the deposits on the collarbone known from the prior art are avoided.
- the invention thus relates to a piston for a Reciprocating internal combustion engine, in particular two-stroke large diesel engine, in which cylinder liner a piston top of the piston in the installed state limits a combustion chamber and the piston along a piston axis in the cylinder liner between a top dead center and a bottom dead center in the axial direction and is arranged to move back and forth.
- a piston ring packing is formed, which comprises at least one piston top next to the next adjacent piston ring configured as a top ring.
- a recess is provided between the top ring and the top side of the piston on the lateral surface of the piston in the region of the piston crown.
- the antipolishing ring can rid the entire remaining lateral surface of the Kolbekrone of the deposits without, as in the prior art, a strip of deposits in the vicinity of the top ring remains. This is ensured in the invention, that in the region above the top ring, which is not reached by the antipolishing ring and where a more or less annular region of deposits remains on the lateral surface in the prior art, the recess formed in the circumferential direction around the piston crown is at the upper edge thereof Antipolishing ring at least approaches, this preferably even partially covered when the piston is at top dead center.
- the recess can also absorb and temporarily store the deposits scraped off by the antipolishing ring, so that the deposits are largely no longer in contact with the running surface of the cylinder liner and also, for example. can not get into the piston ring grooves.
- the interim stored in the recess deposits can then be removed, for example, gradually with the cylinder lubricating oil or blown near the bottom dead center through the scavenging slots so that they can no longer develop their harmful effects in the cylinder liner.
- a predeterminable radial ring section of the top ring limits the recess in the direction of the piston skirt. That is, the recess directly adjoins the top ring without spacing, wherein a width of the radial ring portion is at most 30% of a total radial ring width of the top ring, preferably between 0.5% and 15%, more preferably between 1% and 5% of a radial ring width of the top ring is.
- a distance range is provided between the top ring and the recess, whose diameter corresponds to the diameter of the piston crown. Which ultimately means that the top ring is arranged slightly spaced from the inventive recess.
- a contour of the recess is formed asymmetrically with respect to the piston axis, wherein the contour of the recess in particular towards the top ring may have a smaller pitch along the piston axis, as in the direction of the piston top, whereby e.g. during the downward movement of the piston, the scraped-off deposits in the recess can not easily escape upwards, but are "caught" in the steeper upper region of the recess, so that they gradually melt into the recess with lubricating oil and / or through the scavenging slots in can be blown near the bottom dead center.
- a surface of the recess e.g. also be suitably structured.
- the structuring may be provided by one or more grooves around the piston axis, or e.g. be formed by a helical groove.
- the invention further relates to a cylinder liner arrangement for a reciprocating internal combustion engine, in particular two-stroke large diesel engine comprising a piston arranged in a cylinder liner, wherein a Piston top of the piston defines a combustion chamber and the piston along a piston axis in the cylinder liner between a top dead center and a bottom dead center in the axial direction is arranged back and forth.
- a piston ring packing is formed, which comprises at least one piston top next to the next adjacent piston ring configured as a top ring.
- a recess is provided between the top ring and the top side of the piston on the lateral surface of the piston in the region of the piston crown.
- an antipolishing ring on the cylinder liner is particularly advantageously designed in such a manner that the antipolishing cooperates in the operating state with the recess of the piston in such a way that deposition takes place on the lateral surface of the piston in the region of the piston crown the antipolishing ring is conveyed into the recess.
- a piston-side end of the anti-polishing ring in the region of the top dead center of the piston can cover completely or partially with the recess.
- a per se known compression heater for adjusting the position of the top dead center e.g. provided on the crosshead, wherein the recess is particularly preferably designed such that in each adjustable by the Kompressionshim position of the top dead center, the recess with the antipolishing ring is at least partially brought into coincidence.
- the invention also relates to a method for removing a deposit from a lateral surface of a piston
- a piston ring packing is formed on the lateral surface of the piston between a piston crown facing the combustion chamber and a piston skirt facing away from the combustion chamber, which comprises at least one of the piston top next adjacent piston ring configured as a top ring.
- a recess is provided between the top ring and the piston top side on the lateral surface of the piston in the region of the piston crown into which the deposition on the lateral surface can be scraped off at least partially with the aid of an antipolishing ring provided on the cylinder liner.
- a position of top dead center is particularly preferably set in a manner known per se by means of a compression hehim such that in the region of top dead center the recess is brought into coincidence with the anti-polishing ring.
- Fig. 1 illustrates the known from the prior art problems with a known piston, which are avoided for the first time by the present invention.
- Fig. 1 has already been discussed in detail at the beginning, can be explained directly here with the explanations of Fig. 2 be continued, which shows a particularly important for practice embodiment of an inventive cylinder assembly.
- Fig. 2 is a cylinder liner 3 a cylinder liner arrangement of a reciprocating internal combustion engine 2, in the present case, a two-stroke large diesel engine shown in a schematic manner.
- the cylinder arrangement comprises a piston 1 arranged in the cylinder liner 3, wherein a piston upper side 1011 of the piston 1 limits a combustion chamber VB in a manner known per se and the piston 1 along a piston axis A in the cylinder liner 3 between a top dead center OT and a bottom dead center in the axial direction is arranged movable back and forth.
- a piston ring packing 4 is formed which, in addition to two further piston rings, comprises one piston top 1011 adjacent to the next as a top ring 41 configured piston ring.
- a recess 5 is provided between the top ring 41 and the piston top side 1011 on the lateral surface of the piston 1 in the region of the piston crown 101.
- an antipolishing ring APR is formed on the cylinder liner 3.
- the antipolishing APR cooperates in the operating state with the recess 5 of the piston 1 in such a way that a deposit D on the lateral surface of the piston 1 in the region of the piston crown 101 can be conveyed through the antipolishing ring APR into the recess 5, with a piston-side End of Antipolishing Ring APR in the region of the top dead center OT of the piston 1 as shown with the recess 5 covered.
- a predeterminable radial ring section 410 of the top ring 41 delimits the recess 5 in the direction of the piston skirt 102. That is to say, in the particular embodiment of FIG Fig. 2 the top ring 41 adjoins directly to the recess 5, wherein a width of the radial ring portion 410, which directly adjacent to the recess here is approximately between 0.5% and 15%, a radial ring width 411 of the top ring 41.
- a contour K of the recess 5 is formed asymmetrically with respect to the piston axis A and has here in particular towards the top ring 41 a smaller pitch along the piston axis A, as in the direction of the piston top 1011.
- a surface 51 of the recess 5 may be suitably structured, the structuring in particular being e.g. may be formed by one or more grooves around the piston axis A.
- Fig. 3 is another embodiment of a piston 1 according to the invention shown schematically, the piston 1 according to Fig. 2 only differs in that between the top ring 41 and the recess 5, a distance range 6 is provided, whose diameter corresponds to the diameter of the piston crown 101. That means, in the example of Fig. 3 the top ring 41 is not directly adjacent to the recess 5, but by the distance range 6, which forms a kind of bridge between the recess 5 and the top ring 41, spaced. As a result, it can be better prevented, in particular, that the deposit D stored in the recess 5 can get into the annular groove of the top ring 41.
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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)
Abstract
Description
Die Erfindung betrifft einen Kolben und eine Zylinderanordnung für eine Hubkolbenbrennkraftmaschine, insbesondere Zweitakt-Grossdieselmotor, sowie ein Verfahren zur Entfernung einer Ablagerung von einer Mantelfläche eines Kolbens gemäss dem Oberbegriff der unabhängigen Ansprüche1, 9 und 14.The invention relates to a piston and a cylinder arrangement for a reciprocating internal combustion engine, in particular two-stroke large diesel engine, and a method for removing a deposit from a lateral surface of a piston according to the preamble of
Die aus dem Stand der Technik bekannten Kolben für
Hubkolbenbrennkraftmaschinen, wie zum Beispiel Zweitakt-Grossdieselmotoren, insbesondere für längs gespülte Zweitakt-Grossdieselmotore, sind in der Regel mit einer Packung aus mehreren, in jeweils einer Kolbenringnute, übereinander angeordneten Kolbenringen ausgestattet. Typischerweise umfassen die bekannten Kolbenringpackungen mindestens zwei Kolbenringe, meist jedoch drei, vier oder sogar fünf Kolbenringe, je nach Grösse, Leistung, oder Bauart der Hubkolbenbrennkraftmaschine bzw. je nach Anforderungen und den speziellen Betriebsbedingungen, unter denen die Maschine betrieben wird. Die Kolbenringe erfüllen dabei ganz unterschiedliche Funktionen, wie zum Beispiel die Verteilung und / oder Abstreifung eines Schmiermittels auf der Lauffläche des Zylinders, die Abdichtung des Brennraums gegen das Kurbelgehäuse, bzw. im Falle von längs gespülten Zweitakt-Grossdieselmotoren die Abdichtung gegen den Receiverraum usw..The piston known from the prior art 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, in each case a Kolbenringnute, stacked piston rings. Typically, the known piston ring packings comprise at least two piston rings, but usually three, four or even five piston rings, depending on the size, power, or design of the reciprocating internal combustion engine or depending on 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. ,
Typisch bei längs gespülten Zweitakt-Grossdieselmotoren ist die Verwendung einer Kolbenringpackung bestehend aus vier oder fünf Kolbenringen zur Abdichtung des Brennraums gegen die Kolbenunterseite, die gegen den Receiverraum gerichtet ist, aus dem zu Beginn der Spülphase Frischluft durch die Spülschlitze in den Brennraum des Zylinders strömt. Abhängig vom Ringspalt, sind die unteren Kolbenringe mehr oder weniger stark belastet. Dabei können verschiedenartige Instabilitäten zwischen den unteren Kolbenringen auftreten, die zum Beispiel zu Druckfluktuationen führen können, die ihrerseits wiederum Instabilitäten im Kolbenlauf hervorrufen, weil zu viele Kolbenringe vorhanden sind, die ähnliche oder gleiche Funktionen haben.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. Depending on the annular gap, the lower piston rings are more or less heavily loaded. In this case, various instabilities between the lower piston rings may occur, which may 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.
Grossdieselmotoren werden häufig als Antriebsaggregate für Schiffe oder auch im stationären Betrieb, z.B. zum Antrieb grosser Generatoren zur Erzeugung elektrischer Energie eingesetzt. Dabei laufen die Motoren in der Regel über beträchtliche Zeiträume im Dauerbetrieb, was hohe Anforderungen an die Betriebssicherheit und die Verfügbarkeit stellt. Daher sind für den Betreiber insbesondere lange Wartungsintervalle, geringer Verschleiss und ein wirtschaftlicher Umgang mit Brenn- und Betriebsstoffen zentrale Kriterien für den Betrieb der Maschinen. Unter anderem ist das Kolbenlaufverhalten solcher grossbohrigen langsam laufenden Dieselmotoren ein bestimmender Faktor für die Länge der Wartungsintervalle, die Verfügbarkeit und über den Schmiermittel- und Kraftstoffverbrauch auch unmittelbar für die Betriebskosten und damit für die Wirtschaftlichkeit. Damit kommt auch der komplexen Problematik der Zylinderschmierung und der Abdichtung des Brennraums durch die Kolbenringpackung der Motoren eine immer grössere Bedeutung zu, wobei insbesondere bei Grossdieselmotoren die Zylinderschmierung durch Schmiereinrichtungen im sich hin und her bewegenden Kolben erfolgt oder durch in der Zylinderwand vorgesehene Schmieröldüsen realisiert ist.Large diesel engines are often used as drive units for ships or in stationary operation, eg for driving large generators for generating electrical energy. The engines usually run for long periods in continuous operation, which places high demands on the reliability and availability. Therefore, for the operator in particular long maintenance intervals, low wear and an economical handling of fuels and supplies are central criteria for the operation of the machines. Among other things, the piston running behavior of such large-bore slow-running diesel engines is a determining factor for the length of the maintenance intervals, the availability and on the lubricant and fuel consumption also directly for the operating costs and thus for the economy. This is also the complex problem of cylinder lubrication and the Sealing of the combustion chamber through the piston ring packing of the engines is becoming increasingly important, with cylinder lubrication taking place in the reciprocating piston, in particular in large diesel engines, or being realized by lubricating oil nozzles provided in the cylinder wall.
Ein Punkt, der immer wieder Probleme beim Betrieb von Verbrennungsmotoren bereitet, sind Verbrennungsrückstände, die sich an den unterschiedlichsten Stellen im Motor ablagern können. Vor allem bei Zeitakt-Grossdieselmotoren, die häufig mit Schweröl betrieben werden, stellen Verbrennungsrückstände ein erhebliches Problem dar, da der verwendete Treibstoff, nämlich das Schweröl mit vielen Stoffen beladen ist, die zu festen, flüssigen und gasförmigen Verbrennungsrückständen aller Art führen können, die sich insbesondere am Kolben, an den Kolberingnuten, vor allem auch an der Kolbenkrone oder am Zylinder, bevorzugt auch in der Nähe das oberen Totpunktes absetzen können.One point that repeatedly causes problems in the operation of internal combustion engines, combustion residues, which can be deposited at various points in the engine. Especially in Zeitakt large diesel engines, which are often operated with heavy oil, 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.
Insbesondere um Ablagerungen von Verbrennungsrückständen von der Kolbenkrone abzustreifen, ist es zum Beispiel bei Wärtsilä Zweitaktmotoren bekannt, einen sogenannten Antipolishing Ring im oberen Teil des Zylinderliners vorzusehen. Dieser Ring kann z.B. als dünnwandige Büchse mit rechteckigem Querschnitt ausgeführt sein, die üblicherweise einen kleineren inneren Durchmesser aufweist als der des Zylinders selbst. Durch die Durchmesserverengung wird ein Abstreifeffekt zum Abstreifen von Ablagerungen an der Kolbenkrone generiert. Der innere Durchmesser des Antipolishing Rings richtet sich dabei nach dem Durchmesser der Kolbenkrone, und zwar spezifisch nach deren maximalem Durchmesser im Motorbetrieb. Ziel es daher bei den bekannten Antipolishing Ringen den inneren Durchmesser so eng auszulegen, dass der Spalt zwischen Kolbenkrone und Antipolishing Ring so gering wie möglich wird, die Kolbenkrone aber nicht in direktem Kontakt mechanisch den Antipolishing Ring streift.In particular, in order to strip deposits of combustion residues from the piston crown, it is known, for example, in Wärtsilä two-stroke engines to provide a so-called 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. By the diameter constriction a stripping effect for stripping deposits on the piston crown is generated. 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, it is the objective of the known antipolishing rings to make the inner diameter so narrow that the gap between the piston crown and the antipolishing ring is as small as possible Piston crown but not in direct contact mechanically strips the antipolishing ring.
Es liegt auf der Hand, dass die Auslegung des Antipolishing Rings sehr vielen Kompromissen gehorchen muss. Bei tiefen Lasten und kälterer Kolbenkrone ist das Spiel, also der Abstand zwischen Kolbenkrone und Antipolishing Ring allein schon aufgrund thermischer Ausdehnungseffekte grösser als bei hohen Lasten. Dabei ist zusätzlich zu bedenken, dass im Allgemeinen die verschiedenen Komponenten im Zylinder, wie die Zylinderlauffläche, der Kolben, im Speziellen die Kolbenringe, die Kolbenringnuten aber auch die Kolbenkrone sowohl in Umfangsrichtung als auch in Längsrichtung in Abhängigkeit von der Zahl der geleisteten Betriebsstunden unterschiedlich verschleissen und damit keine wirklich fest definierten Durchmesser haben.It is obvious that 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 really tight diameter.
Somit ist klar, dass bei den aus dem Stand der Technik bekannten Motoren Antipolishing Ring und Kolbenkrone nicht unter allen Betriebsbedingungen und nicht über die gesamte Lebensdauer der beteiligten Komponenten optimal zusammenwirken.Thus, it is clear that in the engines known from the prior art antipolishing ring and piston crown do not cooperate optimally under all operating conditions and not over the entire life of the components involved.
Ein bisher ungelöstes Problem in diesem Zusammenhang ist dabei, dass der Antipolishing Ring, häufig auch kurz mit APR abgekürzt, nicht ganz an den oberen Rand des Kolbenringpakets, also nicht ganz bis an den Topring des Kolbenringpakets in der oberen Totpunktstellung des Kolbens heranreichen darf, da sonst der Antipolishing Ring mit dem Topring in Berührung kommen könnte, was zu massiven Schäden führen könnte, im schlimmsten Fall bis zur Zerstörung des Toprings, oder gar zu einer schweren Schädigung des Kolbens selbst, was sogar den Ausfall eines Zylinders oder im aller schlimmsten Fall des gesamten Motors zur Folge haben kann.A hitherto unresolved problem in this context is that the antipolishing ring, often abbreviated abbreviated to APR, not quite close to the top of the piston ring package, so not quite reach up to the top ring of the piston ring package in the top dead center of the piston because Otherwise, the anti-polishing ring could come into contact with the top ring, which could lead to massive damage, in the worst case to the destruction of the top ring, or even severe damage to the piston itself, which even the failure of a cylinder or worst of the case entire engine can result.
Da also der Antipolishing Ring nicht ganz bis an den Topring des Kolbenringpakets in der oberen Totpunktstellung heranreicht, gibt es immer einen mehr oder weniger breiten Bereich an der Kolbenkrone des Kolbens oberhalb des Toprings, mit dem der Antipolishing Ring nicht in Berührung kommt, so dass die dort befindlichen Ablagerungen auch nicht durch den Antipolishing Ring wegpoliert werden können.So since the Antipolishing ring does not reach all the way to the top ring of the piston ring package in the upper dead center position, there is always a more or less wide area on the plunger crown of the piston above the top ring, with which the antipolishing ring does not come into contact, so that the deposits located there can not be polished away by the antipolishing ring.
Diese Problematik bei den aus dem Stand der Technik bekannten Kolben wird anhand der
Bei seinem Lauf in Richtung zum oberen Totpunkt kommt der Kolben 1' schliesslich mit dem Antipolishing Ring in Berührung, d.h. die Kolbenkrone 101' wird in den Antipolishing Ring hineingeschoben, so dass dieser Ablagerungen D' an der äusseren Mantelfläche der Kolbekrone 101' abschaben bzw. abpolieren kann, bis der Kolben 1' seinen höchsten Punkt im Zylinderliner, den oberen Totpunkt erreicht hat. Da im oberen Totpunkt der Antipolishing Ring zwar den grössten Teil der äusseren Mantelfläche der Kolbenkrone 101' von Ablagerungen D' befreit hat, der Antipolishing Ring aber selbst in der oberen Totpunktstellung des Kolbens 1' nicht ganz bis an den Topring 41' des Kolbenringpakets 4' heranreicht, bleibt oberhalb des Toprings 41' ein Streifen aus Ablagerungen D' an der äusseren Mantelfläche der Kolbenkrone 101' übrig, der vom Antipolishing Ring nicht abgeschabt werden kann, weil der Antipolishing Ring auch im oberen Totpunkt nicht ganz bis an den Topring 41' heranreicht.During its run in the direction of top dead center, the piston 1 'finally comes into contact with the anti-polishing ring, ie the piston crown 101' is pushed into the anti-polishing ring, so that this Deposits D 'on the outer surface of the Kolbekrone 101' can scrape or polish off until the piston 1 'has reached its highest point in the cylinder liner, the top dead center. Since at the top dead center of the antipolishing ring has freed most of the outer surface of the piston crown 101 'of deposits D', but the antipolishing ring even in the top dead center of the piston 1 'not quite up to the top ring 41' of the piston ring package 4 ' reaches, remains above the top ring 41 'a strip of deposits D' on the outer surface of the piston crown 101 'left over, which can not be scraped off the antipolishing ring, because the antipolishing ring is not quite up to the top ring 41' in top dead center 41 ' ,
Die Folge ist, zwischen dem Topring 41' und der Kolbenoberseite 1011' an der Mantelfläche des Kolbens 1' im Bereich der Kolbenkrone 101' ein im wesentlichen ringförmiger Streifen von Ablagerungen D' bei der weiteren Abwärtsbewegung des Kolbens 1' in Richtung zum unteren Totpunkt mitgenommen wird und die wohl bekannten schädigenden Wirkungen an der Lauffläche des Zylinderliners hervorruft. D.h. am Zylinderliner können durch die an der Kolbenkrone 101' verbliebenen Ablagerungen D' Schädigungen wie z.B. Kratzer in der Oberfläche der Lauffläche des Zylinderliners erzeugt werden, oder aber die verbliebenen Ablagerungen D' können sich beispielweise auch mit der Zeit lösen, sich im Kolbenringpaket 4' festsetzen, beispielweise in den Kolberingnuten und damit letztlich auch zu Schädigungen am Kolben 1', im Speziellen den Kolberingnuten oder auch den Kolbenringen führen. Diese Schädigungen verkürzen zumindest die Wartungsintervalle, verkürzen die Gebrauchsdauer der Komponenten des Zylinderliners und können im schlimmsten Fall zu einem Totalausfall des betroffenen Zylinderliners oder gar des gesamten Motors führen.The result is, taken between the top ring 41 'and the piston top 1011' on the lateral surface of the piston 1 'in the region of the piston crown 101' a substantially annular strip of deposits D 'in the further downward movement of the piston 1' in the direction of bottom dead center and causes the well-known damaging effects on the tread of the cylinder liner. That is to say on the cylinder liner, damage such as scratches in the surface of the running surface of the cylinder liner can be generated by the deposits D 'remaining on the piston crown 101', or the remaining deposits D 'can, for example, also become loose over time in the
Die Aufgabe der Erfindung ist es daher einen Kolben, eine Zylinderanordnung und ein Verfahren zur Entfernung von Ablagerungen von einer Mantelfläche eines Kolbens bereitzustellen, so dass die aus dem Stand der Technik bekannten Probleme mit den Ablagerungen an der Kolbekrone vermieden werden.The object of the invention is therefore to provide a piston, a cylinder arrangement and a method for removing deposits from a lateral surface of a piston, so that the problems with the deposits on the collarbone known from the prior art are avoided.
Die diese Aufgaben lösenden Gegenstände der Erfindung sind durch die Merkmale der unabhängigen Ansprüche gekennzeichnet.The objects of the invention solving these objects are characterized by the features of the independent claims.
Die abhängigen Ansprüche beziehen sich auf besonders vorteilhafte Ausführungsformen der Erfindung.The dependent claims relate to particularly advantageous embodiments of the invention.
Die Erfindung betrifft somit einen Kolben für eine
Hubkolbenbrennkraftmaschine, insbesondere Zweitakt-Grossdieselmotor, mit mindestens einem Zylinderliner, in welchem Zylinderliner eine Kolbenoberseite des Kolbens im Einbauzustand einen Brennraum begrenzt und der Kolben entlang einer Kolbenachse im Zylinderliner zwischen einem oberen Totpunkt und einem unteren Totpunkt in axialer Richtung hin- und herbewegbar angeordnet ist. Dabei ist an einer Mantelfläche des Kolbens zwischen einer dem Brennraum zugewandten Kolbenkrone und einem dem Brennraum abgewandten Kolbenhemd eine Kolbenringpackung ausgebildet, die mindestens einen der Kolbenoberseite am nächsten benachbarten als Topring ausgestalteten Kolbenring umfasst. Erfindungsgemäss ist zwischen dem Topring und der Kolbenoberseite an der Mantelfläche des Kolbens im Bereich der Kolbenkrone eine Ausnehmung vorgesehen.The invention thus relates to a piston for a
Reciprocating internal combustion engine, in particular two-stroke large diesel engine, in which cylinder liner a piston top of the piston in the installed state limits a combustion chamber and the piston along a piston axis in the cylinder liner between a top dead center and a bottom dead center in the axial direction and is arranged to move back and forth. In this case, on a lateral surface of the piston between a piston crown facing the combustion chamber and a piston skirt facing away from the combustion chamber, a piston ring packing is formed, which comprises at least one piston top next to the next adjacent piston ring configured as a top ring. According to the invention, a recess is provided between the top ring and the top side of the piston on the lateral surface of the piston in the region of the piston crown.
Dadurch, dass oberhalb des Toprings eine Ausnehmung an der Kolbenkrone vorgesehen ist, kann der Antipolishing Ring die gesamte verbleibende Mantelfläche der Kolbekrone von den Ablagerungen befreien ohne dass, wie im Stand der Technik ein Streifen von Ablagerungen in der Nähe des Toprings zurückbleibt. Das ist bei der Erfindung dadurch gewährleistet, dass sich in dem Bereich oberhalb des Toprings, der vom Antipolishing Ring nicht erreicht wird und wo an der Mantelfläche im Stand der Technik ein mehr oder weniger ringförmiger Bereich von Ablagerungen übrigbleibt, sich die erfindungsgemässe, um die Kolbenkrone in Umfangsrichtung ausgebildete Ausnehmung befindet, an deren oberen Rand der Antipolishing Ring zumindest heranreicht, diese bevorzugt sogar teilweise überdeckt, wenn sich der Kolben im oberen Totpunkt befindet.Characterized in that a recess is provided on the piston crown above the top ring, the antipolishing ring can rid the entire remaining lateral surface of the Kolbekrone of the deposits without, as in the prior art, a strip of deposits in the vicinity of the top ring remains. This is ensured in the invention, that in the region above the top ring, which is not reached by the antipolishing ring and where a more or less annular region of deposits remains on the lateral surface in the prior art, the recess formed in the circumferential direction around the piston crown is at the upper edge thereof Antipolishing ring at least approaches, this preferably even partially covered when the piston is at top dead center.
Dadurch wird nicht nur die gesamte äussere Mantelfläche der Kolbenkrone oberhalb der erfindungsgemässen Ausnehmung zuverlässig durch den Antipolishing Ring von schädlichen Ablagerungen befreit. Sondern die Ausnehmung kann die vom Antipolishing Ring abgeschabten Ablagerungen auch aufnehmen und zwischenspeichern, so dass die Ablagerungen weitgehend nicht mehr mit der Lauffläche des Zylinderliners in Berührung kommen und auch z.B. nicht mehr in die Kolbenringnuten gelangen können. Die in der Ausnehmung zwischengelagerten Ablagerungen können dann zum Beispiel nach und nach mit dem Zylinderschmieröl abtransportiert werden oder in der Nähe des unteren Totpunktes durch die Spülschlitze ausgeblasen werden, so dass sie ihre schädlichen Wirkungen im Zylinderliner nicht mehr entfalten können.As a result, not only the entire outer lateral surface of the piston crown above the recess according to the invention is reliably freed from harmful deposits by the antipolishing ring. Instead, the recess can also absorb and temporarily store the deposits scraped off by the antipolishing ring, so that the deposits are largely no longer in contact with the running surface of the cylinder liner and also, for example. can not get into the piston ring grooves. The interim stored in the recess deposits can then be removed, for example, gradually with the cylinder lubricating oil or blown near the bottom dead center through the scavenging slots so that they can no longer develop their harmful effects in the cylinder liner.
In einem bevorzugten Ausführungsbeispiel der Erfindung begrenzt ein vorgebbarer radialer Ringabschnitt des Toprings die Ausnehmung in Richtung zum Kolbenhemd hin. D.h., die Ausnehmung grenzt direkt ohne Abstand an den Topring an, wobei eine Breite des radialen Ringabschnitts höchstens 30% einer gesamten radialen Ringbreite des Toprings, bevorzugt zwischen 0.5% und 15%, besonders bevorzugt zwischen 1% und 5% einer radialen Ringbreite des Toprings beträgt. Dadurch ist es insbesondere möglich, dass ein Teil des im Kolbenringpaket gespeicherte Gasdrucks leichter in die Ausnehmung entweichen kann und so z.B. das Ausblasen bzw. Ausbringen der in der Ausnehmung gespeichert Ablagerungen mit unterstützt wird und somit erleichtert werden kann.In a preferred embodiment of the invention, a predeterminable radial ring section of the top ring limits the recess in the direction of the piston skirt. That is, the recess directly adjoins the top ring without spacing, wherein a width of the radial ring portion is at most 30% of a total radial ring width of the top ring, preferably between 0.5% and 15%, more preferably between 1% and 5% of a radial ring width of the top ring is. This makes it possible, in particular, for part of the gas pressure stored in the piston ring package to escape more easily into the recess, and thus, for example, for blowing out or discharging the stored deposits in the recess is supported and thus can be facilitated.
In einem anderen Ausführungsbeispiel ist zwischen dem Topring und der Ausnehmung dagegen ein Distanzbereich vorgesehen, dessen Durchmesser dem Durchmesser der Kolbenkrone entspricht. Was letztlich bedeutet, dass der Topring etwas beabstandet zur erfindungsgemässen Ausnehmung angeordnet ist.In another embodiment, however, a distance range is provided between the top ring and the recess, whose diameter corresponds to the diameter of the piston crown. Which ultimately means that the top ring is arranged slightly spaced from the inventive recess.
Besonders bevorzugt ist dabei eine Kontur der Ausnehmung asymmetrisch in Bezug auf die Kolbenachse ausgebildet, wobei die Kontur der Ausnehmung im Speziellen in Richtung zum Topring eine kleinere Steigung entlang der Kolbenachse aufweisen kann, als in Richtung zur Kolbenoberseite, wodurch z.B. bei der Abwärtsbewegung des Kolbens die abgeschabten Ablagerungen in der Ausnehmung nicht so leicht nach oben entweichen können, sondern im steileren oberen Bereich der Ausnehmung "gefangen" werden, so dass sie nach und nach in der Ausnehmung mit Schmieröl verschmischt und / oder durch die Spülschlitze in der Nähe des unteren Totpunkt ausgeblasen werden können.Particularly preferably, a contour of the recess is formed asymmetrically with respect to the piston axis, wherein the contour of the recess in particular towards the top ring may have a smaller pitch along the piston axis, as in the direction of the piston top, whereby e.g. during the downward movement of the piston, the scraped-off deposits in the recess can not easily escape upwards, but are "caught" in the steeper upper region of the recess, so that they gradually melt into the recess with lubricating oil and / or through the scavenging slots in can be blown near the bottom dead center.
Damit die abgeschabten Ablagerungen bis zu deren Austrag aus der Ausnehmung besser in der Ausnehmung zurückgehalten werden können oder z.B. gezielt in einer vorgebbaren Richtung und / oder Bewegung aus der Ausnehmung ausgetragen werden können, kann eine Oberfläche der Ausnehmung z.B. auch geeignet strukturiert sein. So kann die Strukturierung beispielweise durch eine oder mehrerer um die Kolbenachse umlaufende Nute, oder z.B. durch eine schraubenförmige Nute gebildet sein.So that the scraped deposits can be better retained in the recess until they are discharged from the recess, or e.g. can be selectively discharged in a predetermined direction and / or movement of the recess, a surface of the recess, e.g. also be suitably structured. For example, the structuring may be provided by one or more grooves around the piston axis, or e.g. be formed by a helical groove.
Die Erfindung betrifft weiter eine Zylinderlineranordnung für eine Hubkolbenbrennkraftmaschine, insbesondere Zweitakt-Grossdieselmotor, umfassend einen in einem Zylinderliner angeordneten Kolben, wobei eine Kolbenoberseite des Kolbens einen Brennraum begrenzt und der Kolben entlang einer Kolbenachse im Zylinderliner zwischen einem oberen Totpunkt und einem unteren Totpunkt in axialer Richtung hin- und herbewegbar angeordnet ist. Dabei ist an einer Mantelfläche des Kolbens zwischen einer dem Brennraum zugewandten Kolbenkrone und einem dem Brennraum abgewandten Kolbenhemd eine Kolbenringpackung ausgebildet, die mindestens einen der Kolbenoberseite am nächsten benachbarten als Topring ausgestalteten Kolbenring umfasst. Erfindungsgemäss ist zwischen dem Topring und der Kolbenoberseite an der Mantelfläche des Kolbens im Bereich der Kolbenkrone eine Ausnehmung vorgesehen.The invention further relates to a cylinder liner arrangement for a reciprocating internal combustion engine, in particular two-stroke large diesel engine comprising a piston arranged in a cylinder liner, wherein a Piston top of the piston defines a combustion chamber and the piston along a piston axis in the cylinder liner between a top dead center and a bottom dead center in the axial direction is arranged back and forth. In this case, on a lateral surface of the piston between a piston crown facing the combustion chamber and a piston skirt facing away from the combustion chamber, a piston ring packing is formed, which comprises at least one piston top next to the next adjacent piston ring configured as a top ring. According to the invention, a recess is provided between the top ring and the top side of the piston on the lateral surface of the piston in the region of the piston crown.
In der Praxis ist im Bereich des oberen Totpunkts besonders vorteilhaft in an sich bekannter Weise ein Antipolishing Ring am Zylinderliner derart ausgebildet, dass der Antipolishing im Betriebszustand so mit der Ausnehmung des Kolbens zusammenwirkt, dass eine Ablagerung an der Mantelfläche des Kolbens im Bereich der Kolbenkrone durch den Antipolishing Ring in die Ausnehmung beförderbar ist.In practice, in the region of top dead center, an antipolishing ring on the cylinder liner is particularly advantageously designed in such a manner that the antipolishing cooperates in the operating state with the recess of the piston in such a way that deposition takes place on the lateral surface of the piston in the region of the piston crown the antipolishing ring is conveyed into the recess.
Im Speziellen kann ein kolbenseitiges Ende des Antipolishing Rings im Bereich des oberen Totpunkts des Kolbens ganz oder teilweise mit der Ausnehmung überdecken.In particular, a piston-side end of the anti-polishing ring in the region of the top dead center of the piston can cover completely or partially with the recess.
Dabei ist in der Praxis häufig ein an sich bekannter Kompressionshim zur Einstellung der Position des oberen Totpunkts z.B. am Kreuzkopf vorgesehen, wobei die Ausnehmung besonders bevorzugt derart ausgestaltet ist, dass in jeder durch den Kompressionshim einstellbaren Position des oberen Totpunkts die Ausnehmung mit dem Antipolishing Ring zumindest teilweise in Überdeckung bringbar ist.In practice, a per se known compression heater for adjusting the position of the top dead center, e.g. provided on the crosshead, wherein the recess is particularly preferably designed such that in each adjustable by the Kompressionshim position of the top dead center, the recess with the antipolishing ring is at least partially brought into coincidence.
Nicht zuletzt betrifft die Erfindung auch ein Verfahren zur Entfernung einer Ablagerung von einer Mantelfläche eines Kolbens einerLast but not least, the invention also relates to a method for removing a deposit from a lateral surface of a piston
Hubkolbenbrennkraftmaschine mit mindestens einem Zylinderliner, insbesondere Zweitakt-Grossdieselmotor, in welchem Zylinderliner eine Kolbenoberseite des Kolbens im Einbauzustand einen Brennraum begrenzt und der Kolben entlang einer Kolbenachse im Zylinderliner zwischen einem oberen Totpunkt und einem unteren Totpunkt in axialer Richtung hin- und herbewegt wird. Dabei wird an der Mantelfläche des Kolbens zwischen einer dem Brennraum zugewandten Kolbenkrone und einem dem Brennraum abgewandten Kolbenhemd eine Kolbenringpackung ausgebildet, die mindestens einen der Kolbenoberseite am nächsten benachbarten als Topring ausgestalteten Kolbenring umfasst. Erfindungsgemäss wird zwischen dem Topring und der Kolbenoberseite an der Mantelfläche des Kolbens im Bereich der Kolbenkrone eine Ausnehmung vorgesehen, in welche die Ablagerung an der Mantelfläche zumindest teilweise mit Hilfe eines am Zylinderliner vorgesehenen Antipolishing Rings abgeschabt werden kann.Reciprocating internal combustion engine with at least one cylinder liner, in particular two-stroke large diesel engine, in which cylinder liner a piston top of the piston in the installed state limits a combustion chamber and the piston is reciprocated along a piston axis in the cylinder liner between a top dead center and a bottom dead center in the axial direction. In this case, a piston ring packing is formed on the lateral surface of the piston between a piston crown facing the combustion chamber and a piston skirt facing away from the combustion chamber, which comprises at least one of the piston top next adjacent piston ring configured as a top ring. According to the invention, a recess is provided between the top ring and the piston top side on the lateral surface of the piston in the region of the piston crown into which the deposition on the lateral surface can be scraped off at least partially with the aid of an antipolishing ring provided on the cylinder liner.
Besonders bevorzugt wird dabei eine Position des oberen Totpunkts in an sich bekannter Weise mittels eines Kompressionsshims derart eingestellt, dass im Bereich des oberen Totpunkts die Ausnehmung mit dem Antipolishing Ring in Überdeckung gebracht wird.In this case, a position of top dead center is particularly preferably set in a manner known per se by means of a compression hehim such that in the region of top dead center the recess is brought into coincidence with the anti-polishing ring.
Im Folgenden wird die Erfindung wird an Hand der Zeichnung näher erläutert. Es zeigen in schematischer Darstellung:
- Fig. 1
- einen aus dem Stand der Technik bekannten Kolben;
- Fig. 2
- ein Ausführungsbeispiel einer erfindungsgemässen Zylinderanordnung mit Kolben;
- Fig. 3
- ein anderes Ausführungsbeispiel eines erfindungsgemässen Kolbens;
- Fig. 1
- a known from the prior art piston;
- Fig. 2
- an embodiment of an inventive cylinder assembly with piston;
- Fig. 3
- another embodiment of a piston according to the invention;
Die
Anhand der
Im Bereich des oberen Totpunkts OT ist, wie ebenfalls an sich bekannt, ein Antipolishing Ring APR am Zylinderliner 3 ausgebildet. Bei der erfindungsgemässen Zylinderanordnung wirkt der Antipolishing APR im Betriebszustand so mit der Ausnehmung 5 des Kolbens 1 zusammen, dass eine Ablagerung D an der Mantelfläche des Kolbens 1 im Bereich der Kolbenkrone 101 durch den Antipolishing Ring APR in die Ausnehmung 5 beförderbar ist, wobei ein kolbenseitiges Ende des Antipolishing Rings APR im Bereich des oberen Totpunkts OT des Kolbens 1 wie dargestellt mit der Ausnehmung 5 überdeckt.In the region of the top dead center OT, as is also known per se, an antipolishing ring APR is formed on the cylinder liner 3. In the cylinder arrangement according to the invention, the antipolishing APR cooperates in the operating state with the recess 5 of the
Dabei begrenzt ein vorgebbarer radialer Ringabschnitt 410 des Toprings 41 die Ausnehmung 5 in Richtung zum Kolbenhemd 102. D.h., im besonderen Ausführungsbeispiel der
Wie gut zu erkennen ist, ist eine Kontur K der Ausnehmung 5 asymmetrisch in Bezug auf die Kolbenachse A ausgebildet ist und weist hier im Speziellen in Richtung zum Topring 41 eine kleinere Steigung entlang der Kolbenachse A auf, als in Richtung zur Kolbenoberseite 1011.As can be seen well, a contour K of the recess 5 is formed asymmetrically with respect to the piston axis A and has here in particular towards the top ring 41 a smaller pitch along the piston axis A, as in the direction of the piston top 1011.
Je nach Ausführungsbeispiel kann wie bereits erwähnt eine Oberfläche 51 der Ausnehmung 5 geeignet strukturiert sein, wobei die Strukturierung im Speziellen z.B. durch eine oder mehrere um die Kolbenachse A umlaufende Nute gebildet sein kann.Depending on the embodiment, as already mentioned, a surface 51 of the recess 5 may be suitably structured, the structuring in particular being e.g. may be formed by one or more grooves around the piston axis A.
Anhand der
Der Fachmann versteht, dass die zuvor beschriebenen Beispiele von Ausführungsformen der Erfindung exemplarisch zu verstehen sind, und insbesondere auch alle geeigneten Kombinationen der dargestellten Ausführungsbeispiele von der Erfindung umfasst sind.The person skilled in the art will understand that the previously described examples of embodiments of the invention are to be understood as examples, and in particular that all suitable combinations of the illustrated exemplary embodiments are also encompassed by the invention.
Claims (15)
Einstellung der Position des oberen Totpunkts (OT) ein Kompressionsshim vorgesehen ist.Cylinder arrangement according to one of claims 9 to 11, wherein the
Setting the top dead center (OT) position is a compression shim.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP11192378.5A EP2602453A1 (en) | 2011-12-07 | 2011-12-07 | Piston and cylinder assembly for a reciprocating compressor combustion machine and method for removing deposits from a piston |
JP2012131047A JP2013119852A (en) | 2011-12-07 | 2012-06-08 | Piston and cylinder configuration for reciprocating piston combustion engine, and method of removing deposit from piston |
KR1020120076047A KR20130063996A (en) | 2011-12-07 | 2012-07-12 | Piston and cylinder arrangement for a reciprocating piston combustion engine as well as method of removing a deposit from a piston |
CN2012102885706A CN103147871A (en) | 2011-12-07 | 2012-08-14 | Piston and cylinder assembly for reciprocating compressor combustion machine and method for removing deposits from piston |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP11192378.5A EP2602453A1 (en) | 2011-12-07 | 2011-12-07 | Piston and cylinder assembly for a reciprocating compressor combustion machine and method for removing deposits from a piston |
Publications (1)
Publication Number | Publication Date |
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EP2602453A1 true EP2602453A1 (en) | 2013-06-12 |
Family
ID=45346298
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EP11192378.5A Withdrawn EP2602453A1 (en) | 2011-12-07 | 2011-12-07 | Piston and cylinder assembly for a reciprocating compressor combustion machine and method for removing deposits from a piston |
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Country | Link |
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EP (1) | EP2602453A1 (en) |
JP (1) | JP2013119852A (en) |
KR (1) | KR20130063996A (en) |
CN (1) | CN103147871A (en) |
Cited By (1)
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EP3497305A4 (en) * | 2016-08-15 | 2020-07-15 | Fairbanks Morse, LLC | Opposed piston engine cylinder with carbon scraper |
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US20160097340A1 (en) * | 2014-10-03 | 2016-04-07 | Caterpillar Inc. | Cylinder liner assembly having air gap insulation |
KR102084346B1 (en) * | 2016-03-04 | 2020-03-03 | 바르실라 핀랜드 오이 | Cylinder liner and anti-polishing ring |
US10156202B2 (en) * | 2016-03-04 | 2018-12-18 | Achates Power, Inc. | Barrier ring and assembly for a cylinder of an opposed-piston engine |
CN111188692A (en) * | 2018-11-15 | 2020-05-22 | 日立汽车***(苏州)有限公司 | Device for improving engine oil dilution |
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US20070107689A1 (en) * | 2003-10-16 | 2007-05-17 | Kabushiki Kaisha Riken | Internal combustion engine and liner installation ring |
US8020530B2 (en) * | 2007-06-15 | 2011-09-20 | Federal-Mogul Corporation | Piston and internal combustion engine therewith and method of constructing the piston |
EP2243940A1 (en) * | 2009-04-06 | 2010-10-27 | Wärtsilä Schweiz AG | Reduction device for reducing gas pressure in the piston ring package of a hydraulic piston combustion engine |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3497305A4 (en) * | 2016-08-15 | 2020-07-15 | Fairbanks Morse, LLC | Opposed piston engine cylinder with carbon scraper |
Also Published As
Publication number | Publication date |
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KR20130063996A (en) | 2013-06-17 |
CN103147871A (en) | 2013-06-12 |
JP2013119852A (en) | 2013-06-17 |
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