EP3670882B1 - Moteur diesel à combustion interne - Google Patents

Moteur diesel à combustion interne Download PDF

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Publication number
EP3670882B1
EP3670882B1 EP19217077.7A EP19217077A EP3670882B1 EP 3670882 B1 EP3670882 B1 EP 3670882B1 EP 19217077 A EP19217077 A EP 19217077A EP 3670882 B1 EP3670882 B1 EP 3670882B1
Authority
EP
European Patent Office
Prior art keywords
fire ring
cylinder
annular
symmetry axis
annular rim
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.)
Active
Application number
EP19217077.7A
Other languages
German (de)
English (en)
Other versions
EP3670882A1 (fr
Inventor
Mathias Binder
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
Original Assignee
FPT Motorenforschung AG
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Filing date
Publication date
Application filed by FPT Motorenforschung AG filed Critical FPT Motorenforschung AG
Publication of EP3670882A1 publication Critical patent/EP3670882A1/fr
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Publication of EP3670882B1 publication Critical patent/EP3670882B1/fr
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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
    • 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 present invention relates to a diesel internal combustion engine.
  • Diesel combustion engines develop a high particulate amount during fuel combustion.
  • a fire ring also called oil scraper ring, in a fixed ring stuck in the cylinder liner in order to surround the combustion chamber.
  • the fire ring protrudes within the combustion chamber, but without any impact with the piston crown when it reaches the top dead center.
  • the inner diameter of the fire ring is smaller than inner diameter of the cylinder bore.
  • Figure 1 discloses an example internal combustion engine implementing a fire ring according to what applicant considers to be state of the art.
  • the piston P is represented in its TDC position.
  • Figure 2 discloses a magnified portion of figure 1 .
  • the fire ring protrudes for about 0.15 mm within the combustion chamber CC.
  • the piston P has the top surface usually called crown PCR. According to figure 2 , the clearance between the lateral surface of the piston and the cylinder liner CL is about 0.18 mm, therefore, there is no collision risk.
  • the fire ring defines a sort of seal between the combustion chamber and the annular clearance between the piston and the cylinder liner, preventing carbon from depositing on the cylinder liner and thus on the piston rings and piston oil scrape PR.
  • the fire ring in addition, reduces the production of particulate and thus its deposition on the cylinder head.
  • This aspect is particularly relevant because the carbon deposits reduce engines maintenance.
  • the main object of the present invention to improve the effectiveness of the fire ring by modification of its shape.
  • a method for improving the combustion of a diesel combustion engine is provided as defined in claim 1, and a diesel combustion engine is provided as defined in claim 4.
  • the main principle of the invention is to reduce the thermal exchange between the fire ring and the cylinder liner by reducing the contact surface between the outer face of the fire ring.
  • This is preferably achieved by protruding portions shaped as tips or ridges fairly distributed along with the outer surface of the fire ring.
  • said ridges are shaped as annular protruding portions concentric on a cylinder symmetry axis.
  • Said protruding portions are formed in one piece with the fire ring.
  • annular protruding portion shaped as a ring or rim.
  • the fire ring has only two circumferential contact portions, one defined by the annular protruding ring or rim and the lower edge arranged to contact the stepped housing in the cylinder liner.
  • two protruding ring or rims are formed on the outer surface of the fire ring, respectively arranged close to the upper and lower edge of the fire ring in order to assure an optimal stability of the fire ring in the above stepped housing.
  • the upper edge is shaped as a cutting edge protruding towards the cylinder head.
  • This cutting edge defines a sort of additional head gasket operating with a smaller diameter in comparison with the conventional cylinder/head gasket.
  • this cutting edge not only results to be more effective as cylinder/head gasket, but also reduces the dead volume which reduces the engine efficiency.
  • second element does not imply the presence of a "first element”, first, second, etc.. are used only for improving the clarity of the description and they should not be interpreted in a limiting way.
  • the main aim of the present invention is to reduce the contact surface between the fire ring FR and its housing FRH in the top portion of the cylinder liner CL.
  • the top portion of the cylinder is close to the cylinder head H.
  • the housing is conventionally obtained by enlarging the cylinder bore by achieving a stepped profile.
  • the fire ring FR is inserted.
  • the fire ring consist substantially in a ring with an inner surface IS, facing the combustion chamber, and an outer surface OS facing the housing FR.
  • the outer surface usually has a cylindrical shape and lower edge has a shape such that to axially interfere with the stepped housing.
  • the term "axially” is referred to the symmetry axis X of the cylinder, which coincides with the symmetry axis of the fire ring.
  • a first contact region C1 is flat and defined according to a plane perpendicular to the symmetry axis X of the cylinder between the stepped housing and the lower edge of the fire ring.
  • Such contact region C1 is flat because the lower edge of the fire ring is flat and perpendicular with respect to the inner surface IS of the fire ring.
  • TDC top dead center
  • BDC bottom dead center
  • the stepped housing FRH has also a cylindrical surface LF, coaxial with the cylinder axis X, larger with respect to the cylinder bore.
  • the fire ring FR has an outer surface including an annular protruding ring CR, arranged between the upper and lower edges of the outer surface of the fire ring.
  • annular protruding ring CR which as a ridge defined on the annular outer surface of the fire ring, defines a mechanical and thermal interface with the cylindrical surface LF of the housing FRH. Also in this case, a second contact region C2 is defined. This contact region is substantially perpendicular to the first contact region C1.
  • the central portion of the annular outer surface of the fire ring is machined such that two ridges R1, R2 are defined. Such ridges are arranged close to the opposite ends of the outer surface of the fire ring.
  • the outer surface can be machined at the lower edge so as to reduce the first contact region C1.
  • the outer surface can be machined at the upper end, close to the cylinder head, such that two triangular clearances are defined between the fire ring and the cylindrical surface when in operation, according to the above sectional view.
  • the central portion of the outer surface of the fire ring is machined such as to obtain hemispherical surface with radius 15 mm, by operatively defining a circular segment, according to the above sectional view.
  • the outer surface OS of the fire ring is provided with annular rings, substantially rims, coaxial with symmetry axis X of the cylinder.
  • Figure 5 discloses an embodiment of the invention that is combined with the example of figure 4 .
  • the cylinder head receives a high thermal stress, however the cylinder head H is highly refreshed by the engine water. Therefore, to better insulate the fire ring from the cylinder head H, also the upper edge of the fire ring FR is machined so as to define a cutting edge.
  • the outer surface is machined at the upper edge in order to define an upper ridge UR intended to contact the cylinder head H, so as to reduce thermal exchange with the latter.
  • the ridge UR is defined by an edge joining a first surface and a second surface, inclined one with respect of the other by means of an acute angle.
  • the first surface is the cylindrical inner surface of the fire ring, as it remains unchanged, as mentioned above, and the second surface is a frusto-conical surface CE, that joins the ridge UR to the contact region of an annular rim contacting the cylinder CL.
  • this cutting edge defined by the ridge UR defines a sort of additional head gasket operating with a smaller diameter in comparison with the conventional cylinder/head gasket.
  • the cutting edge of the ridge UR defines a sort of shield for the cylinder head gasket and reduces the dead volume, which would otherwise reduce the engine efficiency.

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)
  • Glass Compositions (AREA)

Claims (5)

  1. Méthode pour améliorer la combustion d'un moteur diesel à combustion comprenant au moins un cylindre (C) avec un piston (P) respectif et un segment de feu (FR) respectif, qui est inséré dans un logement étagé (FRH) défini dans une chemise de cylindre (CL) de manière à entourer une chambre de combustion (CC) respective, la méthode comprenant l'étape de :
    - mise en forme d'une surface extérieure (OS) du segment de feu (FR), destinée à entrer en contact avec ledit logement étagé (FRH), de manière à comprendre au moins une partie saillante annulaire formée comme une pointe ou une arête de manière à réduire un échange de chaleur entre le segment de feu et la chemise de cylindre ;
    caractérisée en ce qu'elle comprend en outre :
    - l'usinage de ladite surface extérieure au niveau d'un bord supérieur du segment de feu (FR) de telle manière que ledit bord supérieur consiste en un bord de coupe destiné à entrer en contact avec une culasse (H) du moteur à combustion et à définir un effet d'étanchéité entre le segment de feu (FR) et la culasse (H),
    ladite au moins une partie saillante annulaire étant formée comme une bordure annulaire coaxiale avec un axe de symétrie (X) dudit cylindre ;
    dans laquelle ladite surface extérieure est formée de manière à comprendre deux parties saillantes annulaires définissant respectivement une première bordure annulaire et une seconde bordure annulaire (R1, R2), dans laquelle la première bordure annulaire est proche d'un bord inférieur dudit segment de feu et la seconde bordure annulaire est proche dudit bord supérieur dudit segment de feu ; et dans laquelle, entre lesdites première et seconde bordures annulaires, une partie intermédiaire du segment de feu est usinée de manière à définir un segment circulaire, conformément à une vue en coupe longitudinale tracée de manière à comporter l'axe de symétrie (X) du segment de feu, ledit axe de symétrie du segment de feu coïncidant avec l'axe de symétrie du cylindre.
  2. Méthode selon la revendication 1, comprenant en outre l'étape d'usinage de ladite surface extérieure au niveau d'un bord inférieur du segment de feu de telle manière que, conformément à une vue en coupe longitudinale, le bord inférieur soit effilé et ait une première région de contact (C1) réduite en contact avec ledit logement étagé, dans laquelle ladite première région de contact est plate et se développe sur un plan perpendiculaire à un axe de symétrie (X) de cylindre.
  3. Méthode selon l'une quelconque des revendications précédentes, dans laquelle ledit bord de coupe forme un angle aigu.
  4. Moteur diesel à combustion comprenant au moins un cylindre (C) avec un piston (P) respectif et un segment de feu (FR) respectif, qui est inséré dans un logement étagé (FRH) défini dans une chemise de cylindre (CL) de manière à entourer une chambre de combustion (CC) respective, le segment de feu comprenant :
    - une surface extérieure (OS) qui est en contact avec ledit logement étagé (FRH) et est formée de manière à comprendre au moins une partie saillante annulaire formée comme une pointe ou une arête de manière à réduire un échange de chaleur entre le segment de feu et la chemise de cylindre ;
    - un bord supérieur ;
    caractérisé en ce que ladite surface supérieure est en creux au niveau dudit bord supérieur de telle manière que ledit bord supérieur consiste en un bord de coupe en contact avec une culasse (H) du moteur à combustion et définissant un effet d'étanchéité entre le segment de feu (FR) et la culasse (H),
    dans lequel ladite au moins une partie saillante est formée comme une bordure annulaire coaxiale avec un axe de symétrie (X) dudit cylindre ;
    dans lequel ladite surface extérieure est formée de manière à comporter deux parties saillantes annulaires définissant respectivement une première bordure annulaire et une seconde bordure annulaire (R1, R2), dans lequel la première bordure annulaire est proche d'un bord inférieur dudit segment de feu et la seconde bordure annulaire est proche dudit bord supérieur dudit segment de feu ;
    dans lequel entre lesdites première et seconde bordures annulaires une partie intermédiaire du segment de feu définit un segment circulaire, conformément à une vue en coupe longitudinale tracée de manière à comporter l'axe de symétrie (X) du segment de feu, l'axe de symétrie (X) du segment de feu coïncidant avec l'axe de symétrie du cylindre.
  5. Moteur selon la revendication 4, dans lequel ledit bord de coupe forme un angle aigu.
EP19217077.7A 2018-12-18 2019-12-17 Moteur diesel à combustion interne Active EP3670882B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000020110A IT201800020110A1 (it) 2018-12-18 2018-12-18 Motore a combustione interna diesel

Publications (2)

Publication Number Publication Date
EP3670882A1 EP3670882A1 (fr) 2020-06-24
EP3670882B1 true EP3670882B1 (fr) 2022-11-16

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ID=65767261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19217077.7A Active EP3670882B1 (fr) 2018-12-18 2019-12-17 Moteur diesel à combustion interne

Country Status (2)

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EP (1) EP3670882B1 (fr)
IT (1) IT201800020110A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU209540U1 (ru) 2020-07-13 2022-03-17 Пауэрхаус Энджин Солюшнз Свитселанд АйПи Холдинг ГмбХ Двигатель внутреннего сгорания
WO2022044986A1 (fr) * 2020-08-25 2022-03-03 Ｔｐｒ株式会社 Bague de protection thermique pour chemise de cylindre, et moteur à combustion interne
JP7342998B1 (ja) 2022-03-24 2023-09-12 いすゞ自動車株式会社 内燃機関

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3038235C2 (de) * 1980-10-10 1983-12-22 Mahle Gmbh, 7000 Stuttgart Zylinder oder Zylinderlaufbuchse für Hubkolben-Verbrennungsmotoren
JP2007032401A (ja) * 2005-07-26 2007-02-08 Yanmar Co Ltd 予混合圧縮自着火式内燃機関
EP3114338B1 (fr) * 2014-03-03 2021-04-28 Cummins, Inc. Racleur de carbone
US20160097340A1 (en) * 2014-10-03 2016-04-07 Caterpillar Inc. Cylinder liner assembly having air gap insulation
EP3043054B1 (fr) * 2015-01-09 2019-05-01 Caterpillar Motoren GmbH & Co. KG Insert annulaire pour chemise de cylindre
AT519790B1 (de) * 2017-04-13 2019-01-15 Avl List Gmbh Brennkraftmaschine

Also Published As

Publication number Publication date
IT201800020110A1 (it) 2020-06-18
EP3670882A1 (fr) 2020-06-24

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