EP2602453A1 - Piston et agencement de cylindre pour un moteur à combustion interne à piston élévateur et procédé de suppression d'un dépôt depuis un piston - Google Patents

Piston et agencement de cylindre pour un moteur à combustion interne à piston élévateur et procédé de suppression d'un dépôt depuis un piston Download PDF

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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.)
Withdrawn
Application number
EP11192378.5A
Other languages
German (de)
English (en)
Inventor
Lukas Frischknecht
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 EP11192378.5A priority Critical patent/EP2602453A1/fr
Priority to JP2012131047A priority patent/JP2013119852A/ja
Priority to KR1020120076047A priority patent/KR20130063996A/ko
Priority to CN2012102885706A priority patent/CN103147871A/zh
Publication of EP2602453A1 publication Critical patent/EP2602453A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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 
    • 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
    • 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
    • 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.

Landscapes

  • 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)
EP11192378.5A 2011-12-07 2011-12-07 Piston et agencement de cylindre pour un moteur à combustion interne à piston élévateur et procédé de suppression d'un dépôt depuis un piston Withdrawn EP2602453A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP11192378.5A EP2602453A1 (fr) 2011-12-07 2011-12-07 Piston et agencement de cylindre pour un moteur à combustion interne à piston élévateur et procédé de suppression d'un dépôt depuis un piston
JP2012131047A JP2013119852A (ja) 2011-12-07 2012-06-08 往復ピストン燃焼エンジン用のピストンおよびシリンダ配置、ならびにピストンから堆積物を除去する方法
KR1020120076047A KR20130063996A (ko) 2011-12-07 2012-07-12 왕복 피스톤 연소 기관을 위한 피스톤과 실린더 장치 및 피스톤으로부터 퇴적물을 제거하는 방법
CN2012102885706A CN103147871A (zh) 2011-12-07 2012-08-14 用于发动机的活塞和汽缸装置及从活塞移除沉积物的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11192378.5A EP2602453A1 (fr) 2011-12-07 2011-12-07 Piston et agencement de cylindre pour un moteur à combustion interne à piston élévateur et procédé de suppression d'un dépôt depuis un piston

Publications (1)

Publication Number Publication Date
EP2602453A1 true EP2602453A1 (fr) 2013-06-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11192378.5A Withdrawn EP2602453A1 (fr) 2011-12-07 2011-12-07 Piston et agencement de cylindre pour un moteur à combustion interne à piston élévateur et procédé de suppression d'un dépôt depuis un piston

Country Status (4)

Country Link
EP (1) EP2602453A1 (fr)
JP (1) JP2013119852A (fr)
KR (1) KR20130063996A (fr)
CN (1) CN103147871A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3497305A4 (fr) * 2016-08-15 2020-07-15 Fairbanks Morse, LLC Cylindre de moteur à pistons opposés avec grattoir de carbone

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160097340A1 (en) * 2014-10-03 2016-04-07 Caterpillar Inc. Cylinder liner assembly having air gap insulation
US10156202B2 (en) * 2016-03-04 2018-12-18 Achates Power, Inc. Barrier ring and assembly for a cylinder of an opposed-piston engine
WO2017149190A1 (fr) * 2016-03-04 2017-09-08 Wärtsilä Finland Oy Chemise de cylindre et segment anti-polissage
CN111188692A (zh) * 2018-11-15 2020-05-22 日立汽车系统(苏州）有限公司 改善机油稀释的装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586465A (en) * 1982-02-04 1986-05-06 Krogdahl Michael R Internal combustion engine
JPS61190153A (ja) * 1985-02-19 1986-08-23 Yanmar Diesel Engine Co Ltd 内燃機関のピストン
US4681072A (en) * 1985-11-25 1987-07-21 Sonex Research, Inc. Method and apparatus for disposal of toxic wastes by combustion
US5052356A (en) * 1976-10-19 1991-10-01 Sonex Research, Inc. Method for control of pressure in internal combustion engines
EP0837982A1 (fr) * 1995-07-07 1998-04-29 MAN B&W Diesel A/S Moteur a combustion interne dote d'un anneau de grattage du depot charbonneux dans un cylindre
US20050051128A1 (en) * 2003-09-09 2005-03-10 Kim Min Jeong Piston structure for reducing friction losses
US20070107689A1 (en) * 2003-10-16 2007-05-17 Kabushiki Kaisha Riken Internal combustion engine and liner installation ring
EP2243940A1 (fr) * 2009-04-06 2010-10-27 Wärtsilä Schweiz AG Dispositif de réduction destiné à la réduction d'une pression de gaz sur un paquet de bague de piston d'un moteur à combustion interne à piston élévateur
US8020530B2 (en) * 2007-06-15 2011-09-20 Federal-Mogul Corporation Piston and internal combustion engine therewith and method of constructing the piston

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5052356A (en) * 1976-10-19 1991-10-01 Sonex Research, Inc. Method for control of pressure in internal combustion engines
US4586465A (en) * 1982-02-04 1986-05-06 Krogdahl Michael R Internal combustion engine
JPS61190153A (ja) * 1985-02-19 1986-08-23 Yanmar Diesel Engine Co Ltd 内燃機関のピストン
US4681072A (en) * 1985-11-25 1987-07-21 Sonex Research, Inc. Method and apparatus for disposal of toxic wastes by combustion
EP0837982A1 (fr) * 1995-07-07 1998-04-29 MAN B&W Diesel A/S Moteur a combustion interne dote d'un anneau de grattage du depot charbonneux dans un cylindre
US20050051128A1 (en) * 2003-09-09 2005-03-10 Kim Min Jeong Piston structure for reducing friction losses
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 (fr) * 2009-04-06 2010-10-27 Wärtsilä Schweiz AG Dispositif de réduction destiné à la réduction d'une pression de gaz sur un paquet de bague de piston d'un moteur à combustion interne à piston élévateur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3497305A4 (fr) * 2016-08-15 2020-07-15 Fairbanks Morse, LLC Cylindre de moteur à pistons opposés avec grattoir de carbone

Also Published As

Publication number Publication date
KR20130063996A (ko) 2013-06-17
JP2013119852A (ja) 2013-06-17
CN103147871A (zh) 2013-06-12

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