EP3670882B1 - Dieselbrennkraftmaschine - Google Patents
Dieselbrennkraftmaschine Download PDFInfo
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 22
- 238000005520 cutting process Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims 2
- 238000007789 sealing Methods 0.000 claims 2
- 238000007493 shaping process Methods 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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)
- Verfahren zum Verbessern der Verbrennung einer Dieselbrennkraftmaschine, die mindestens einen Zylinder (C) mit einem entsprechenden Kolben (P) und einem entsprechenden Feuerring (FR), der in eine gestufte Aufnahme (FRH), die in einer Zylinderauskleidung (CL) derart definiert ist, dass sie die entsprechende Brennkammer (CC) umgibt, eingesetzt ist, umfasst, wobei das Verfahren den folgenden Schritt umfasst:- Formen einer Außenoberfläche (OS) des Feuerrings (FR), die dazu vorgesehen ist, die gestufte Aufnahme (FRH) zu berühren, derart, dass sie mindestens einen ringförmigen Vorsprungsabschnitt umfasst, der als eine Spitze oder eine Erhebung geformt ist, um einen Wärmeaustausch zwischen dem Feuerring und der Zylinderauskleidung zu verringern;ferner gekennzeichnet durch- Bearbeiten der Außenoberfläche bei einer Oberkante des Feuerrings (FR) derart, dass die Oberkante aus einer Schneidkante besteht, die vorgesehen ist, einen Zylinderkopf (H) der Brennkraftmaschine zu berühren und eine Dichtungswirkung zwischen dem Feuerring (FR) und dem Zylinderkopf (H) zu definieren, wobeider mindestens eine ringförmige Vorsprungsabschnitt als ein ringförmiger Rand mit einer Symmetrieachse (X) des Zylinders koaxial geformt ist;die Außenoberfläche derart geformt ist, dass sie zwei ringförmige Vorsprungsabschnitte umfasst, die einen ersten ringförmigen Rand bzw. einen zweiten ringförmigen Rand (R1, R2) definieren, wobei der erste ringförmige Rand in der Nähe einer Unterkante des Feuerrings liegt und der zweite ringförmige Rand in der Nähe der Oberkante des Feuerrings liegt; und zwischen dem ersten und dem zweiten ringförmigen Rand ein Zwischenabschnitt des Feuerrings derart bearbeitet ist, dass er ein kreisförmiges Segment gemäß einer Längsschnittansicht, die derart gezogen ist, dass sie die Symmetrieachse (X) des Feuerrings enthält, definiert, wobei die Symmetrieachse des Feuerrings mit der Symmetrieachse des Zylinders übereinstimmt.
- Verfahren nach Anspruch 1, das ferner den Schritt des Bearbeitens der Außenoberfläche bei einer Unterkante des Feuerrings derart umfasst, dass die Unterkante sich gemäß einer Längsschnittansicht verjüngt und einen verringerten ersten Kontaktbereich (C1) in Kontakt mit der gestuften Aufnahme aufweist, wobei der erste Kontaktbereich flach ist und in einer Ebene senkrecht zu einer Zylindersymmetrieachse (X) auftritt.
- Verfahren nach einem der vorhergehenden Ansprüche, wobei die Schneidkante einen spitzen Winkel bildet.
- Dieselbrennkraftmaschine, die mindestens einen Zylinder (C) mit einem entsprechenden Kolben (P) und einem entsprechenden Feuerring (FR), der in eine gestufte Aufnahme (FRH), die in einer Zylinderauskleidung (CL) derart definiert ist, dass sie die entsprechende Brennkammer (CC) umgibt, eingesetzt ist, umfasst, wobei der Feuerring Folgendes umfasst:- eine Außenoberfläche (OS), die mit der gestuften Aufnahme (FRH) in Kontakt ist und derart geformt ist, dass sie mindestens einen ringförmigen Vorsprungsabschnitt umfasst, der als eine Spitze oder eine Erhebung geformt ist, um einen Wärmetausch zwischen dem Feuerring und der Zylinderauskleidung zu verringern; und- eine Oberkante;dadurch gekennzeichnet, dass die Außenoberfläche bei der Oberkante derart versenkt ist, dass die Oberkante aus einer Schneidkante besteht, die einen Zylinderkopf (H) der Brennkraftmaschine berührt und eine Dichtungswirkung zwischen dem Feuerring (FR) und dem Zylinderkopf (H) definiert, wobeider mindestens eine Vorsprungsabschnitt als ein ringförmiger Rand geformt ist, der mit einer Symmetrieachse (X) des Zylinders koaxial ist;die Außenoberfläche derart geformt ist, dass sie zwei ringförmige Vorsprungsabschnitte enthält, die einen ersten ringförmigen Rand bzw. einen zweiten ringförmigen Rand (R1, R2) definieren, wobei der erste ringförmige Rand in der Nähe einer Unterkante des Feuerrings liegt und der zweite ringförmige Rands in der Nähe der Oberkante des Feuerrings liegt; wobeizwischen dem ersten und dem zweiten ringförmigen Rand ein Zwischenabschnitt des Feuerrings ein kreisförmiges Segment gemäß einer Längsschnittansicht, die derart gezogen ist, dass sie die Symmetrieachse (X) des Feuerrings enthält, definiert, wobei die Symmetrieachse (X) des Feuerrings mit der Symmetrieachse des Zylinders übereinstimmt.
- Kraftmaschine nach Anspruch 4, wobei die Schneidkante einen spitzen Winkel bildet.
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 (de) | 2020-06-24 |
EP3670882B1 true EP3670882B1 (de) | 2022-11-16 |
Family
ID=65767261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19217077.7A Active EP3670882B1 (de) | 2018-12-18 | 2019-12-17 | Dieselbrennkraftmaschine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3670882B1 (de) |
IT (1) | IT201800020110A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU208566U1 (ru) * | 2020-07-13 | 2021-12-23 | Пауэрхаус Энджин Солюшнз Свитселанд АйПи Холдинг ГмбХ | Двигатель внутреннего сгорания |
JP7157262B2 (ja) * | 2020-08-25 | 2022-10-19 | Tpr株式会社 | シリンダライナ用遮熱リングおよび内燃機関 |
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)
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 (de) * | 2014-03-03 | 2021-04-28 | Cummins, Inc. | Ölkohleabstreifer |
US20160097340A1 (en) * | 2014-10-03 | 2016-04-07 | Caterpillar Inc. | Cylinder liner assembly having air gap insulation |
EP3043054B1 (de) * | 2015-01-09 | 2019-05-01 | Caterpillar Motoren GmbH & Co. KG | Ring für eine zylinderlaufbuchse |
AT519790B1 (de) * | 2017-04-13 | 2019-01-15 | Avl List Gmbh | Brennkraftmaschine |
-
2018
- 2018-12-18 IT IT102018000020110A patent/IT201800020110A1/it unknown
-
2019
- 2019-12-17 EP EP19217077.7A patent/EP3670882B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
EP3670882A1 (de) | 2020-06-24 |
IT201800020110A1 (it) | 2020-06-18 |
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