EP2700801A1 - Chemise pour moteur à combustion interne, procédé de fabrication d'une bague d'appui pour la chemise - Google Patents

Chemise pour moteur à combustion interne, procédé de fabrication d'une bague d'appui pour la chemise Download PDF

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Publication number
EP2700801A1
EP2700801A1 EP12181581.5A EP12181581A EP2700801A1 EP 2700801 A1 EP2700801 A1 EP 2700801A1 EP 12181581 A EP12181581 A EP 12181581A EP 2700801 A1 EP2700801 A1 EP 2700801A1
Authority
EP
European Patent Office
Prior art keywords
cylinder liner
support ring
cylinder
support
ring
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Withdrawn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
EP12181581.5A
Other languages
German (de)
English (en)
Inventor
Timo Hanz
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 EP12181581.5A priority Critical patent/EP2700801A1/fr
Publication of EP2700801A1 publication Critical patent/EP2700801A1/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Withdrawn legal-status Critical Current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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/004—Cylinder liners
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the invention relates to a cylinder liner with a support ring for a reciprocating internal combustion engine, in particular for a longitudinally purged two-stroke large diesel engine, a method for producing a support ring for a cylinder liner, and a support ring according to the preamble of the independent claim of the respective category.
  • cooling rings which are preferably equipped with a water cooling, so that at least a portion of the resulting heat loads on the cooling ring from the cylinder liner are weg1700bar.
  • simple cooling rings are provided, such as already in the US 937,200 shown.
  • the cylinder liner Due to the enormous combustion pressure in the combustion chamber and the enormous pressure fluctuations in the combustion chamber associated with the combustion or the movement of the piston, the cylinder liner experiences very strong, periodic, not only, but especially at its upper end, where the combustion starts in the combustion chamber during operation alternating radial expansions and radial reductions in its diameter. That The diameter of the cylinder liner changes periodically in the operating state, ie it is alternately periodically smaller and larger. It should also be considered that, especially in the case of a large diesel engine, the cylinder liner is additionally under an enormous axial bias by extending in the longitudinal direction of the cylinder liner tie rod.
  • the neutral zone moves radially inwards.
  • the tensile forces in the wall of the cylinder liner grow radially outside the neutral zone massively, while the tensile forces radially inside the neutral zone are getting smaller and may even substantially disappear.
  • the cylinder liner is exposed, at least in the radial direction by the dynamic radial strains enormous periodically fluctuating forces and mechanical stresses that expose the cylinder liner in addition to the thermal loads and enormous mechanical loads, which ultimately leads to premature fatigue and thus, the life of the cylinder liner is reduced and maintenance intervals are shortened.
  • the piston running behavior is adversely affected because the piston is no longer optimally adapted to the inner diameter of the cylinder liner due to the diameter variations of the cylinder liner, since the inner diameter is constantly changing, which ultimately adversely affect the combustion process and thus the entire operation of the engine can.
  • the object of the invention is therefore an improved cylinder liner for a reciprocating internal combustion engine, in particular for a longitudinally flushed
  • a reciprocating internal combustion engine in particular for a longitudinally flushed
  • the known from the prior art problems are avoided, which can compensate better especially the occurring in the operating state enormous thermal and mechanical loads, in particular the static and dynamic thermal strains occurring so that a higher reliability of the internal combustion engine is ensured, maintenance intervals can be extended, the life of the cylinder liner is significantly increased, and thus ultimately the cost of operating the engine can be significantly reduced.
  • the invention thus relates to a cylinder liner for a reciprocating internal combustion engine, in particular two-stroke large diesel engine, wherein a support ring is provided on an outer support surface of the cylinder liner concentric about a cylinder axis of the cylinder liner that the support ring is supported via a contact surface of the support ring on the support surface.
  • the support ring is designed such that a radial enlargement of the cylinder liner induced in relation to the cylinder axis can be limited to a predefinable value by the support ring.
  • the induced radial enlargement of the cylinder liner can be limited to a predefinable value by the inventive support ring.
  • This is for example with the cooling ring of the aforementioned US 937,200 not possible, as it expands under thermal stress substantially as much as the Cylinder liner, since the cylinder liner and the cooling ring are made of materials with the same or very similar radial coefficients of thermal expansion, so that the cooling ring can not act as a support ring in the context of the present invention, since he is unable to the radial magnification of the cylinder liner limit.
  • a cylinder liner of the present invention therefore has a backing ring that preferably has an effective radial coefficient of thermal expansion that is less than an effective radial thermal expansion coefficient of the cylinder liner. That is, if the support ring and the cylinder liner are subjected to substantially equal thermal stress, the resulting thermal expansion of the support ring in the radial direction will be less than the corresponding radial thermal expansion that the cylinder liner would have if there were no support ring on the cylinder liner. As a result, the radial thermal expansion of the cylinder liner is limited by a corresponding design of the support ring to a predeterminable extent under thermal load, because the support ring prevents radial expansion beyond the predetermined amount.
  • a support ring of the present invention may also serve as a mating surface for a seal of a per se known cooling water space arranged in the cylinder liner.
  • a support ring with the properties according to the invention can be realized, for example, by selecting a material for the support ring which has a smaller coefficient of thermal expansion in the circumferential direction of the support ring than the material is produced from the cylinder liner.
  • the effective radial thermal expansion coefficient of the support ring may also be zero or even less than zero.
  • the material may e.g. in a longitudinal direction formed in the circumferential direction of the support ring, have a smaller expansion coefficient than in a direction perpendicular thereto.
  • such a material in the longitudinal direction may also have a thermal expansion coefficient equal to or less than zero, which means that e.g. under temperature increase the material and thus the support ring made therefrom in the longitudinal direction in the length not changed, or even shortened in the longitudinal direction, which corresponds to a negative coefficient of thermal expansion in the longitudinal direction.
  • the support ring is made at least of a carbon material and a fixing resin, in particular of wound carbon fiber bundles or carbon mats.
  • the aforementioned spatial anisotropic effect in the thermal expansion coefficient is often based on the orientation of the strongest atomic bonds in the longitudinal direction of the material.
  • these can be crystal planes and, for polymers, e.g. be the molecular chains.
  • graphite is composed of individual layers.
  • the high strength and the high modulus of elasticity of the C fibers are based on the strong bonding of the graphite crystals in one layer plane. High strength values can not only be achieved with static load. Carbon fibers also have excellent fatigue resistance. Due to the orientation of the strong covalent bonds of the Graphite crystal in the fiber longitudinal direction behaves the C-fiber - in contrast to the glass fiber - significantly anisotropic. It is often of particular interest that the moduli of elasticity in fiber longitudinal and transverse directions can often differ by one or more orders of magnitude.
  • the anisotropy also affects the thermal expansion coefficient. This is e.g. transverse to the fiber direction, but smaller in the fiber direction than transverse to the fiber direction, or zero or even negative. This effect can be more pronounced the higher the graphite crystals are aligned, i. the higher the fiber-parallel elastic modulus.
  • the contact surface of the support ring with respect to the cylinder axis of the cylinder liner is inclined at a contact angle, preferably but not necessarily, the support surface is inclined with respect to the cylinder axis at a support angle.
  • the contact angle corresponds to the support angle, wherein the contact angle is in particular equal to the support angle.
  • the contact surface in practice is advantageous in the direction towards the upper end of the cylinder liner, ie in the installed state in the direction of the cylinder cover, inclined in the direction of the cylinder axis, so that the support ring has a conical inner structure which widens from the upper end of the cylinder liner that the support ring can be particularly easily mounted on the support surface of the cylinder liner.
  • the assembly or replacement of the support ring can also be facilitated by the fact that the support ring on a cylinder cover in the installed state facing the end of the cylinder liner in a Stauerringnute, is preferably arranged in a direction open towards the cylinder cover Stauerringnute.
  • a support ring according to the invention can also be provided at any point with respect to the axial direction on the cylinder liner, so for example in the middle or at the bottom of the cylinder liner or at any other point.
  • the invention further relates to a method for producing a support ring for a cylinder liner of the present invention, wherein a carbon material is molded with the aid of a molded part as a carbon ring, with a fixing resin is applied, and the carbon material is cured with the fixing resin at a predetermined fixing temperature as a support ring ,
  • the support ring is made of wound carbon fiber bundles or carbon mats, wherein the cylinder liner itself can be used as a molded part, for example by the carbon material is wound as a carbon ring on the cylinder liner, is applied to the fixing resin, and the carbon material with the fixing resin at a predetermined fixing temperature is cured on the cylinder liner to the support ring.
  • a separate, suitably designed fixing can be used, in particular in a method according to the invention, a curing at room temperature fixing resin can be used.
  • Fiber mats can also be used in principle, however, the achievable modulus of elasticity in the longitudinal direction by the Offdiretationalen structure is significantly lower and the larger modulus in the transverse direction offers less advantages, since the ring is not loaded in the transverse direction so high, except in transverse contraction under load , The stiffness of the support ring at a given cross section can therefore be adjusted individually for each support ring by the choice and the orientation of the fibers.
  • the production of the support ring itself can also be done in different ways.
  • the fiber is, as already mentioned, wound directly onto the cylinder liner, for example into a groove provided for this purpose or closed in the axial direction or else onto a separate mold. If the carbon fiber is wound directly onto the cylinder, this offers the advantage that the ring automatically rests without play. Due to the high operating temperature of, for example, about 175 ° C, the resin must be cured at elevated temperature to use it at such high temperatures can. During hardening / tempering, the cylinder also heats up and this experiences a thermally induced strain in the radial direction.
  • the support ring can be made using a separate mold.
  • the thermal expansion of the mold during the annealing process can be taken into account.
  • the support ring is pre-stretched to the desired extent during curing.
  • the inner surface of the support ring and the outer surface of the cylinder be made conical in order to compensate for any manufacturing tolerances can.
  • the conical angle should be kept so small that there is self-locking between ring and cylinder. The support ring is then pushed with force during assembly.
  • a contact surface can be formed on the support ring particularly preferably under a conical contact angle.
  • a radial thermal expansion coefficient of the support ring can be set particularly advantageous equal to zero or even less than zero.
  • the invention also relates to a support ring for a cylinder liner, which is preferably produced by a method according to the invention.
  • FIG. 1 schematically a section of an inventive cylinder liner 1 is shown with a support ring 3 made of a carbon material, which was prepared according to a particularly preferred embodiment of an inventive method.
  • the support ring 3 is arranged on an outer support surface 4 of the cylinder liner 1 concentrically about a cylinder axis of the cylinder liner 1 and supported on the support surface 4.
  • the support ring 3 is designed such that a radial enlargement of the cylinder liner 1 induced with respect to the cylinder axis A can be limited to a predefinable value by the support ring 3.
  • the support ring 3 of Fig. 1 is made of a wound carbon fiber bundle and a fixing resin, wherein the cylinder liner 1 was used as a molding by the carbon material wound as a carbon ring on the cylinder liner 1, was applied to the fixing resin, and the carbon material with the fixing resin at a predetermined fixing temperature, preferably at Room temperature was cured on the cylinder liner 1 to the support ring 3.
  • Fig. 1 has an effective radial thermal expansion coefficient which is less than zero.
  • the contact surface 31 is the contact surface 31 with respect to the cylinder axis A at a contact angle ⁇ in the direction of the cylinder cover 5 and inclined in the direction of the cylinder axis A.
  • the support surface 4 is inversely inclined relative to the cylinder axis A at a support angle ⁇ such that the contact angle ⁇ corresponds to the support angle ⁇ , the contact angle ⁇ in the specific embodiment of Fig. 1 is equal to the support angle ⁇ .
  • the support ring 3 is on a cylinder cover. 5 facing end of the cylinder liner 1 in a cylinder cover 5 open Stitzringnute 6 arranged.

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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)
EP12181581.5A 2012-08-23 2012-08-23 Chemise pour moteur à combustion interne, procédé de fabrication d'une bague d'appui pour la chemise Withdrawn EP2700801A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12181581.5A EP2700801A1 (fr) 2012-08-23 2012-08-23 Chemise pour moteur à combustion interne, procédé de fabrication d'une bague d'appui pour la chemise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12181581.5A EP2700801A1 (fr) 2012-08-23 2012-08-23 Chemise pour moteur à combustion interne, procédé de fabrication d'une bague d'appui pour la chemise

Publications (1)

Publication Number Publication Date
EP2700801A1 true EP2700801A1 (fr) 2014-02-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12181581.5A Withdrawn EP2700801A1 (fr) 2012-08-23 2012-08-23 Chemise pour moteur à combustion interne, procédé de fabrication d'une bague d'appui pour la chemise

Country Status (1)

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EP (1) EP2700801A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160032862A1 (en) * 2014-07-31 2016-02-04 General Electric Company System and method for reduced crevice volume of a piston cylinder assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US937200A (en) 1909-03-09 1909-10-19 Floyd T Wood Whip-socket.
DE3419003C1 (de) * 1984-05-22 1985-03-07 Daimler-Benz Ag, 7000 Stuttgart In einen Zylinderblock einer Brennkraftmaschine eingesetzte Zylinderbuchse
DE3335536A1 (de) * 1983-09-30 1985-04-18 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Vorrichtung zum begrenzen radialer thermischer ausdehnungen von zylindern einer hubkolben-brennkraftmaschine
JPH08200062A (ja) * 1995-01-27 1996-08-06 Mitsubishi Heavy Ind Ltd 深溝冷却シリンダライナ
DE19604595C1 (de) * 1996-02-08 1997-07-10 Milorad Dipl Ing Mirjanic Zylinderblock einer Brennkraftmaschine und in diesen eingesetzte Zylinderbuchse
FR2886348A1 (fr) * 2005-05-24 2006-12-01 Peugeot Citroen Automobiles Sa Dispositif limiteur de deformations pour le cylindre d'un moteur a combustion interne, moteur a combustion interne comportant un tel dispositif, ainsi que procede de mise en place d'un tel dispositif

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US937200A (en) 1909-03-09 1909-10-19 Floyd T Wood Whip-socket.
DE3335536A1 (de) * 1983-09-30 1985-04-18 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Vorrichtung zum begrenzen radialer thermischer ausdehnungen von zylindern einer hubkolben-brennkraftmaschine
DE3419003C1 (de) * 1984-05-22 1985-03-07 Daimler-Benz Ag, 7000 Stuttgart In einen Zylinderblock einer Brennkraftmaschine eingesetzte Zylinderbuchse
JPH08200062A (ja) * 1995-01-27 1996-08-06 Mitsubishi Heavy Ind Ltd 深溝冷却シリンダライナ
DE19604595C1 (de) * 1996-02-08 1997-07-10 Milorad Dipl Ing Mirjanic Zylinderblock einer Brennkraftmaschine und in diesen eingesetzte Zylinderbuchse
FR2886348A1 (fr) * 2005-05-24 2006-12-01 Peugeot Citroen Automobiles Sa Dispositif limiteur de deformations pour le cylindre d'un moteur a combustion interne, moteur a combustion interne comportant un tel dispositif, ainsi que procede de mise en place d'un tel dispositif

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160032862A1 (en) * 2014-07-31 2016-02-04 General Electric Company System and method for reduced crevice volume of a piston cylinder assembly

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