EP3670882A1 - Dieselbrennkraftmaschine - Google Patents

Dieselbrennkraftmaschine Download PDF

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Publication number
EP3670882A1
EP3670882A1 EP19217077.7A EP19217077A EP3670882A1 EP 3670882 A1 EP3670882 A1 EP 3670882A1 EP 19217077 A EP19217077 A EP 19217077A EP 3670882 A1 EP3670882 A1 EP 3670882A1
Authority
EP
European Patent Office
Prior art keywords
fire ring
cylinder
annular
shaped
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.)
Granted
Application number
EP19217077.7A
Other languages
English (en)
French (fr)
Other versions
EP3670882B1 (de
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
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 FPT Motorenforschung AG filed Critical FPT Motorenforschung AG
Publication of EP3670882A1 publication Critical patent/EP3670882A1/de
Application granted granted Critical
Publication of EP3670882B1 publication Critical patent/EP3670882B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 8.
  • 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.
  • 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 can be combined with the examples of figures 3 and 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)
EP19217077.7A 2018-12-18 2019-12-17 Dieselbrennkraftmaschine Active EP3670882B1 (de)

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 true EP3670882A1 (de) 2020-06-24
EP3670882B1 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114109639A (zh) * 2020-08-25 2022-03-01 帝伯爱尔株式会社 汽缸套用隔热环和内燃机
AT17674U1 (de) * 2020-07-13 2022-10-15 Powerhouse Engine Solutions Switzerland IP Holding GmbH Verbrennungsmotorsystem
JP7342998B1 (ja) 2022-03-24 2023-09-12 いすゞ自動車株式会社 内燃機関

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3038235A1 (de) * 1980-10-10 1982-05-06 Mahle Gmbh, 7000 Stuttgart Zylinder oder zylinderlaufbuchse fuer 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
WO2015134162A1 (en) * 2014-03-03 2015-09-11 Cummins, Inc. Carbon scraper
WO2016054173A1 (en) * 2014-10-03 2016-04-07 Caterpillar Inc. Cylinder liner assembly having air gap insulation
EP3043054A1 (de) * 2015-01-09 2016-07-13 Caterpillar Motoren GmbH & Co. KG Ring für eine zylinderlaufbuchse
DE102018205673A1 (de) * 2017-04-13 2018-10-18 Avl List Gmbh Brennkraftmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3038235A1 (de) * 1980-10-10 1982-05-06 Mahle Gmbh, 7000 Stuttgart Zylinder oder zylinderlaufbuchse fuer 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
WO2015134162A1 (en) * 2014-03-03 2015-09-11 Cummins, Inc. Carbon scraper
WO2016054173A1 (en) * 2014-10-03 2016-04-07 Caterpillar Inc. Cylinder liner assembly having air gap insulation
EP3043054A1 (de) * 2015-01-09 2016-07-13 Caterpillar Motoren GmbH & Co. KG Ring für eine zylinderlaufbuchse
DE102018205673A1 (de) * 2017-04-13 2018-10-18 Avl List Gmbh Brennkraftmaschine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT17674U1 (de) * 2020-07-13 2022-10-15 Powerhouse Engine Solutions Switzerland IP Holding GmbH Verbrennungsmotorsystem
US11767803B2 (en) 2020-07-13 2023-09-26 Powerhouse Engine Solutions Switzerland IP Holding GmbH Internal combustion engine system
CN114109639A (zh) * 2020-08-25 2022-03-01 帝伯爱尔株式会社 汽缸套用隔热环和内燃机
JPWO2022044986A1 (de) * 2020-08-25 2022-03-03
WO2022044986A1 (ja) * 2020-08-25 2022-03-03 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
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
CN114109639B (zh) * 2020-08-25 2023-04-07 帝伯爱尔株式会社 汽缸套用隔热环和内燃机
JP7342998B1 (ja) 2022-03-24 2023-09-12 いすゞ自動車株式会社 内燃機関
JP2023141494A (ja) * 2022-03-24 2023-10-05 いすゞ自動車株式会社 内燃機関

Also Published As

Publication number Publication date
EP3670882B1 (de) 2022-11-16
IT201800020110A1 (it) 2020-06-18

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