EP1391602B1 - Chemise-cylindre pour un moteur à combustion interne et moteur avec cette chemise - Google Patents

Chemise-cylindre pour un moteur à combustion interne et moteur avec cette chemise Download PDF

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Publication number
EP1391602B1
EP1391602B1 EP03017193A EP03017193A EP1391602B1 EP 1391602 B1 EP1391602 B1 EP 1391602B1 EP 03017193 A EP03017193 A EP 03017193A EP 03017193 A EP03017193 A EP 03017193A EP 1391602 B1 EP1391602 B1 EP 1391602B1
Authority
EP
European Patent Office
Prior art keywords
engine block
liner
cylinder head
cylinder
engine
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.)
Expired - Lifetime
Application number
EP03017193A
Other languages
German (de)
English (en)
Other versions
EP1391602A1 (fr
Inventor
Giancarlo Dellora
Rudolf Ellensohn
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.)
FPT Motorenforschung AG
Iveco SpA
Original Assignee
Iveco Motorenforschung AG
Iveco SpA
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 Iveco Motorenforschung AG, Iveco SpA filed Critical Iveco Motorenforschung AG
Publication of EP1391602A1 publication Critical patent/EP1391602A1/fr
Application granted granted Critical
Publication of EP1391602B1 publication Critical patent/EP1391602B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F1/16—Cylinder liners of wet type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/004—Cylinder liners

Definitions

  • the present invention relates to a cylinder liner for an internal-combustion engine and an engine comprising such a liner.
  • Internal-combustion engines generally comprise an engine block cast from a suitable metal alloy, generally cast iron or an aluminium alloy, and defining a plurality of cylinders, and a cylinder head which is mounted fluid-tightly on the engine block with the interposition of a gasket.
  • the cylinders are lined internally with respective sleeves or liners which are made from a material (generally special cast iron) designed to resist the mechanical, thermal and chemical stresses to which they are subjected by the gases resulting from combustion; the liners have to undergo high precision machining so as to guide properly the reciprocating motion of the associated piston.
  • a material generally special cast iron
  • the liners are normally provided with an upper outer collar which is accommodated in an annular recess of the engine block surrounding the respective cylinder.
  • the cylinder head has a lower surface which is adapted to be connected with a corresponding upper surface of the engine block with the interposition of a flat gasket.
  • This gasket extends substantially over the entire interface surface between the engine block and the cylinder head, and it is provided with a series of openings corresponding to the cylinders and to the various ducts for the circulation of coolant and lubricant.
  • the known gaskets have elastic annular zones, of increased thickness, which co-operate with the collars of the cylinder liners.
  • DE 35 30 411 and DE 24 42 352 disclose cylinder linings, to be fitted into engine blocks defining cylinders, equipped with elastic elements to improve fluid tightness between the cylinder lining and the cylinder head. However, fluid tightness must be ensured by a rigid seal ring. The proposed solutions are still unsatisfactory for what concerns fluid tightness and ease of machining of the various components.
  • an internal-combustion engine comprising an engine block provided with at least one cylinder, a liner fitted in said cylinder, a cylinder head mounted on said engine block and sealing means interposed between said engine block and said cylinder head so as to provide a gas-tight connection around said cylinder, said sealing means comprising an annular elastic element forming part of said liner and adapted to co-operate fluidtightly with said cylinder head, the liner comprising a cylindrical side wall and a collar extending outwardly from an upper end of the side wall and accommodated in an annular seating of the engine block, said annular elastic element being formed by at least one portion of said collar, characterised in that said elastic element is bounded upwardly by a free surface which projects with respect to an upper surface of said engine block when said elastic element is not deformed and which is adapted to co-operate in a force-fit with said cylinder head following the mounting of said cylinder head on said engine block.
  • the cylinder liner comprises a cylindrical side wall and an upper collar forming a single body with the side wall and accommodated in a seating of the engine block coaxial to the cylinder and integrally defining said elastic element.
  • the reference numeral 5 generally denotes an internal-combustion engine comprising an engine block 6 provided with a plurality of cylinders 7, only one of which is partly illustrated.
  • the engine 5 further comprises a cylinder head 12, partly illustrated, which is adapted to be fastened to the engine block 6 by means of screws (not shown); the cylinder head 12 defines the combustion chambers (not shown for simplicity) and accommodates in known manner the inlet and exhaust valves of the cylinders, which are also not shown.
  • the cylinder head 12 is bounded at the bottom by a lower flat surface 13 adapted to be connected with a corresponding upper flat surface 14 of the engine block 6.
  • the cylinder 7 is lined internally with a liner 8 comprising a cylindrical side wall 9 and an outer annular collar 10 which is securely fastened to an upper end of the side wall 9.
  • the collar 10 can be integral with the side wall 9, as shown in the drawings, or applied thereto.
  • the collar 10 is accommodated in an annular seating 17 of the engine block 6, which is coaxial to the cylinder 7 and which is defined by a recess in the upper surface 14 surrounding the cylinder 7, and it abuts against a shoulder 18 downwardly delimiting the seating 17.
  • the side wall 9 is machined internally with the maximum degree of precision, so as to guide with minimum wear the reciprocating motion of a corresponding piston 11 (indicated schematically in dashed line), and it is produced from a material (for example a special cast iron or stainless steel) designed to resist the mechanical and thermal stresses and the chemical corrosion of the combustion gases.
  • a material for example a special cast iron or stainless steel
  • the liner 8 is provided with an annular elastic element 16 adapted to be deformed elastically when the cylinder head 12 is installed on the engine block 6 and to co-operate fluidtightly with the lower surface 13 of the cylinder head 12 as a result of the elastic reaction caused by this deformation.
  • the element 16 is formed by a deformable portion of the collar 10 and has an upper free surface 22 which can be force-fitted against the flat surface 13 of the cylinder head 12.
  • the element 16 is defined by an annular groove 25 which is provided in a lateral surface 20 of the collar 10 and which separates it from a lower portion 24 of the substantially rigid collar 10 co-operating with the shoulder 18 of the engine block 6.
  • the force-fit between the free surface 22 of the elastic element 16 and the surface 13 of the cylinder head is achieved in that the elastic element 16 projects upwards by an amount h with respect to the flat surface 14 of the engine block 6 when the cylinder head 12 is detached from the engine block 6 as in Figure 1 , and the elastic element 16 is in an undeformed condition.
  • the free surface 22 is formed with a slight countersinking ⁇ so as to exhibit, in section, a profile increasing from the inside (where it is substantially level with the upper surface 14 of the engine block 6) to the outside, where it projects with respect to the surface 14.
  • the free surface 22 is disposed level with the surface 14 of the engine block 6 following the elastic deformation caused by the fastening of the cylinder head 12 on the engine block 6, as indicated in Figure 2 .
  • the extent of the projection h with respect to the surface 14 of the engine block 6 may be of the order of magnitude of several hundredths of a millimetre, for example between 0.01 and 0.1 mm, and preferably between 0.03 and 0.065 mm.
  • the countersinking ⁇ of the free surface 22 with respect to a plane perpendicular to the axis of the liner 8 may be between 1° and 3°and, preferably, equal to about 2°.
  • the elastic element 16 bends and brings the free surface 22 level with the flat surface 14 of the engine block 6. In this way the elastic element 16 exerts an elastic force against the flat surface 13 of the cylinder head 12 so as to ensure a perfect gas-tight seal of the liner 8 of the cylinder 7, at the maximum pressure provided for the operation of the engine 5.
  • combustion gas seal may be achieved, according to the present invention, without the use of a gasket between the engine block 6 and the cylinder head 12 of the engine 5. In this way the problems associated with the use of the above-mentioned conventional means are eliminated.
  • the engine described and, in particular, the liner 8 designed in accordance with the invention can be subject to modifications and improvements without departing from the scope of the claims.
  • the collar 10 and the side wall 9 of the liner 8 can be produced as separate parts and assembled subsequently.
  • the collar 10 and the surface 22 can be of any shape suitable for the purpose.
  • the invention can be applied to various types of internal-combustion engine, diesel or controlled ignition, including air-cooled engines and two-stroke engines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Gasket Seals (AREA)
  • Closures For Containers (AREA)

Claims (10)

  1. Moteur à combustion interne (5), comprenant un bloc-moteur (6) muni d'au moins un cylindre (7), une chemise (8) adaptée dans ledit cylindre (7), une culasse (12) montée sur ledit bloc-moteur (6) et des moyens d'étanchéité (16) interposés entre ledit bloc-moteur (6) et ladite culasse (12) de sorte à fournir une connexion étanche aux gaz autour dudit cylindre (7), lesdits moyens d'étanchéité comprenant un élément élastique annulaire (16) faisant partie de ladite chemise (8) et adapté de sorte à coopérer de manière étanche aux fluides avec ladite culasse (12), la chemise (8) comprenant une paroi latérale cylindrique (9) et un collier (10) s'étendant vers l'extérieur depuis une extrémité supérieure de la paroi latérale (9) et logé dans un siège annulaire (17) du bloc-moteur (6), ledit élément élastique annulaire étant formé par au moins une partie dudit collier (10), caractérisé en ce que ledit élément élastique (16) est délimité vers le haut par une surface libre qui fait saillie par rapport à une surface supérieure du bloc-moteur (6) lorsque ledit élément élastique (16) n'est pas déformé, et qui est adaptée pour coopérer en ajustement serré avec ladite culasse suite au montage de ladite culasse (12) sur ledit bloc-moteur.
  2. Moteur selon la revendication 1, caractérisé en ce que ledit collier (10) présente une rainure annulaire périphérique qui définit une partie supérieure élastiquement déformable dudit collier formant ledit élément élastique annulaire, et une partie inférieure agencée de sorte à buter contre un épaulement inférieur dudit siège.
  3. Moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite surface libre (22) présente une fraisure (α) avec un profil qui s'évase de l'intérieur vers l'extérieur de manière à faire saillie par rapport à la surface supérieure (14) dudit bloc moteur (6) le long d'un bord externe de celui-ci.
  4. Moteur selon la revendication 3, caractérisé en ce que ladite fraisure (α) est de 1° à 3°.
  5. Moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite surface libre (22) fait saillie par rapport à la surface supérieure (14) dudit bloc-moteur dans une mesure de 0,01 à 0,1 mm.
  6. Chemise (8) pour un cylindre (7) d'un moteur à combustion interne (5) muni d'un bloc-moteur (6) définissant ledit cylindre (7) et avec une culasse (12), ladite chemise comprenant un élément élastique annulaire (16) adapté pour coopérer de manière étanche aux fluides avec ladite culasse (12) dudit moteur(5), caractérisée en ce que ledit élément élastique (16) est délimité vers le haut par une surface libre (22) adaptée pour coopérer en ajustement serré avec ladite culasse (12) suite au montage de ladite culasse (12) sur ledit bloc-moteur (6).
  7. Chemise selon la revendication 6, caractérisée en ce qu'elle comprend une paroi latérale cylindrique (9) et un collier (10) s'étendant extérieurement depuis une extrémité supérieure de la paroi latérale (9), ledit élément élastique (16) annulaire étant formé par au moins une partie dudit collier (10).
  8. Chemise selon la revendication 7, caractérisée en ce que ledit collier (10) présente une rainure annulaire périphérique (25) qui définit une partie supérieure élastiquement déformable dudit collier (10), formant ledit élément élastique annulaire (16), et une partie inférieure (24) adaptée pour être disposée en butée contre un épaulement inférieur d'un siège (17) dudit bloc-moteur (6).
  9. Chemise selon l'une quelconque des revendications 6 à 8, caractérisée en ce que ladite surface libre (22) présente une fraisure (α) avec un profil qui s'évase de l'intérieur vers l'extérieur.
  10. Chemise selon la revendication 9, caractérisée en ce que ladite fraisure (α) est de 1° à 3°.
EP03017193A 2002-08-23 2003-07-29 Chemise-cylindre pour un moteur à combustion interne et moteur avec cette chemise Expired - Lifetime EP1391602B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20020748 2002-08-23
IT000748A ITTO20020748A1 (it) 2002-08-23 2002-08-23 Canna di rivestimento di un cilindro di un motore a

Publications (2)

Publication Number Publication Date
EP1391602A1 EP1391602A1 (fr) 2004-02-25
EP1391602B1 true EP1391602B1 (fr) 2008-08-20

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ID=11459589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03017193A Expired - Lifetime EP1391602B1 (fr) 2002-08-23 2003-07-29 Chemise-cylindre pour un moteur à combustion interne et moteur avec cette chemise

Country Status (5)

Country Link
EP (1) EP1391602B1 (fr)
AT (1) ATE405739T1 (fr)
DE (1) DE60323019D1 (fr)
ES (1) ES2312696T3 (fr)
IT (1) ITTO20020748A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005048537A1 (de) * 2005-10-11 2007-04-19 Daimlerchrysler Ag Brennkraftmaschine mit einem Zylinderkopf und einem Zylindergehäuse

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1209373B (de) * 1960-03-03 1966-01-20 Daimler Benz Ag Zylinderlaufbuechse, insbesondere fuer Brennkraftmaschinen
DE2442352C2 (de) * 1974-09-04 1984-11-15 Daimler-Benz Ag, 7000 Stuttgart Zylinderlaufbüchse in einem Zylinderblock einer Brennkraftmaschine
DE2442738A1 (de) * 1974-09-06 1976-03-18 Daimler Benz Ag Zylinderkopfdichtung fuer brennkraftmaschinen
DE3530411A1 (de) * 1985-08-26 1987-02-26 Kloeckner Humboldt Deutz Ag Zylinderlaufbuchse fuer eine brennkraftmaschine

Also Published As

Publication number Publication date
EP1391602A1 (fr) 2004-02-25
ES2312696T3 (es) 2009-03-01
ITTO20020748A0 (it) 2002-08-23
ITTO20020748A1 (it) 2004-02-24
ATE405739T1 (de) 2008-09-15
DE60323019D1 (de) 2008-10-02

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