EP2729689B1 - Kolben für einen verbrennungsmotor - Google Patents

Kolben für einen verbrennungsmotor Download PDF

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Publication number
EP2729689B1
EP2729689B1 EP12755778.3A EP12755778A EP2729689B1 EP 2729689 B1 EP2729689 B1 EP 2729689B1 EP 12755778 A EP12755778 A EP 12755778A EP 2729689 B1 EP2729689 B1 EP 2729689B1
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EP
European Patent Office
Prior art keywords
cooling channel
piston
narrowing
constriction
coolant
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
EP12755778.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2729689A1 (de
Inventor
Ulrich Bischofberger
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2729689A1 publication Critical patent/EP2729689A1/de
Application granted granted Critical
Publication of EP2729689B1 publication Critical patent/EP2729689B1/de
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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
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • 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
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/10—Cooling by flow of coolant through pistons

Definitions

  • the present invention relates to a piston for an internal combustion engine according to the preamble of patent claim 1.
  • Pistons of this type are exposed to high mechanical and, in particular, thermal stress in modern combustion engines. There is therefore a fundamental need to continually optimize the cooling of the pistons by supplying coolant to the cooling channel, particularly in the area of the piston crown.
  • a piston designed in this way is used, for example, in the US 2,244,008 A described.
  • the object of the present invention is to further develop a generic piston in such a way that the cooling in the area of the piston crown is further improved.
  • the solution is that the cooling channel has a constriction.
  • the present invention is based on the continuity equation of fluid dynamics, according to which a narrowing of the flow cross-section in flowing fluids leads to an increase in the flow velocity.
  • the narrowing provided according to the invention in conjunction with the shaker effect, causes the coolant circulating in the cooling channel not only to be mixed, but also to be specifically accelerated by the narrowing and guided towards the piston bottom. This causes the mixed and thus cooled Coolant is guided past the particularly hot wall sections of the cooling channel in the area of the piston bottom much more efficiently and more frequently per piston stroke than in the previously known pistons. This increases the heat transfer coefficient between the cooling channel wall and the coolant and thus significantly improves the cooling of the piston according to the invention.
  • the constriction is formed by exactly one material elevation on a cooling channel wall, and the cooling channel cover is essentially dome-shaped. This ensures that the coolant in the area of the cooling channel cover is forced into a circular flow, so that it interacts with the wall of the cooling channel several times per piston stroke. Coolant of a lower temperature is always accelerated through the constriction and replenished. This effect is particularly effective when the radial dimension of the essentially dome-shaped cooling channel cover at its widest point is at least equal to twice the radial dimension of the constriction. In this case, less hot coolant can flow downwards, so that the flow of coolant of a lower temperature through the constriction towards the cooling channel cover is not significantly impeded.
  • the constriction provided according to the invention expediently has a distance from the cooling channel floor that corresponds to at least one third of the axial height and/or at most two thirds of the axial height of the cooling channel. This makes it possible to achieve a particularly effective acceleration of the coolant flow in the direction of the cooling channel ceiling. To optimize the acceleration, the constriction preferably has essentially the same distance from the cooling channel floor and from the cooling channel ceiling.
  • constriction is expediently designed as a circumferential constriction in order to achieve the acceleration effect along the entire cooling channel.
  • the cooling channel wall adjacent to the ring section can be designed to be vertical or inclined inwards.
  • the present invention is suitable for all piston types and all piston designs and can be implemented with any piston material.
  • Fig.1 shows an embodiment of a piston 10 according to the invention.
  • the piston 10 can be a one-piece or multi-piece piston.
  • the piston 10 can be made of a steel material and/or a light metal material.
  • Fig.1 shows an example of a one-piece piston head 11 of a piston according to the invention.
  • the piston head 11 has a piston bottom 12 with a combustion bowl 13, a circumferential top land 14 and a ring section 15 for receiving piston rings (not shown).
  • a circumferential cooling channel 16 with a cooling channel bottom 17 and a cooling channel cover 18 is provided.
  • the piston 10 also has a piston skirt in a manner known per se, which can be integral with the piston head 11 or can be designed as a separate component that is firmly connected to the piston head 11 in a manner known per se or, for example, in the manner of a pendulum-shaft piston (not shown).
  • the cooling channel 16 has a circumferential constriction 20.
  • the constriction 20 is formed by exactly one material elevation 21 in the cooling channel wall adjacent to the combustion bowl 13.
  • the cooling channel wall 22 adjacent to the ring section 15 is essentially vertical in this embodiment. It can also be slightly inclined inwards, i.e. in the direction of the combustion bowl 13.
  • the cooling channel cover 18 of the cooling channel 16 is essentially dome-shaped.
  • the constriction 20 has essentially the same distance A from the cooling channel base 17 and from the cooling channel cover 18 at its narrowest point.
  • the coolant in the area of the cooling channel cover 18 is forced into a circular flow, as indicated by the circular arrows, so that the coolant can interact with the wall of the cooling channel in the area of the piston base 12 and the combustion bowl 13 several times per piston stroke. Coolant of a lower temperature is always accelerated through the constriction 20 and supplied.
  • the radial dimension B of the essentially dome-shaped cooling channel cover 18 at its widest point is Position at least equal to twice the radial dimension b of the constriction 20, i.e. B ⁇ 2 ⁇ b. In this case, less hot coolant can flow downwards, so that the flow of coolant of lower temperature through the constriction 20 in the direction of the cooling channel cover 18 is not significantly impeded.
  • the piston 10 according to the invention or the piston upper part 11 can be produced in a manner known per se by casting, forging, sintering, etc. in a one-piece piston upper part 11, as shown in Fig.1
  • the cooling channel designed according to the invention can be produced in a manner known per se by casting with a salt core.
  • Fig.2 shows an embodiment of a piston 110 not belonging to the invention.
  • the piston 110 can be a one-piece or multi-piece piston.
  • the piston 110 can be made of a steel material and/or a light metal material.
  • Fig.2 shows, by way of example, a one-piece piston head 111 of the piston 110.
  • the piston head 111 has a piston bottom 112 with a combustion bowl 113, a circumferential top land 114 and a ring section 115 for receiving piston rings (not shown).
  • a circumferential cooling channel 116 with a cooling channel bottom 117 and a cooling channel cover 118 is provided.
  • the piston 110 also has a piston shaft in a manner known per se, which can be formed in one piece with the piston head 111 or as a separate component that is firmly connected to the piston head 111 in a manner known per se or, for example, in the manner of a pendulum shaft piston (not shown).
  • the cooling channel 116 has a circumferential constriction 120.
  • the constriction 120 is formed in this embodiment by exactly two opposing material elevations 121 in the two Combustion bowl 113 or cooling channel walls adjacent to ring section 115.
  • the cooling channel cover 118 of the cooling channel 116 has a flow divider 123 at its zenith, which is arranged centrally to the constriction 120.
  • the distance between the constriction 120 and the cooling channel bottom 117 is approximately exactly as large as the distance between the constriction 120 and the cooling channel cover 118.
  • the radial dimension B of the cooling channel cover 118 at its widest point is at least equal to twice the radial dimension b of the constriction 120, i.e. B ⁇ 2 ⁇ b. In this case, less hot coolant can flow downwards, so that the flow of coolant of lower temperature through the constriction 120 in the direction of the cooling channel cover 118 is not significantly impeded.
  • the regions 118a, 118b of the cooling channel cover 118 that adjoin the flow divider 123 are arcuate or circular in cross section and the flow divider 123 is V-shaped in cross section.
  • the piston 110 or the piston upper part 111 can be produced in a manner known per se by casting, forging, sintering, etc.
  • the cooling channel 116 can be produced in a manner known per se by casting with a salt core. If the piston upper part 111 is formed in two parts and the two parts are connected to one another by friction welding, the friction weld seam can be laid through the cooling channel 116 so that opposing material elevations 121, which cause the constriction 120, can be formed by friction weld beads, as are created in a manner known per se during the friction welding process.
  • Fig.3 shows a further embodiment of a piston 210 not belonging to the invention.
  • the piston 210 can be a one-piece or multi-piece piston.
  • the piston 210 can be made of a steel material and/or a light metal material.
  • Fig.3 shows, by way of example, a one-piece piston head 211 of the piston 210.
  • the piston head 211 has a piston bottom 212 with a combustion bowl 213, a circumferential top land 214 and a ring section 215 for receiving piston rings (not shown).
  • a circumferential cooling channel 216 with a cooling channel bottom 217 and a cooling channel cover 218 is provided.
  • the piston 210 also has a piston shaft in a manner known per se, which can be formed in one piece with the piston head 211 or as a separate component that is firmly connected to the piston head 211 in a manner known per se or, for example, in the manner of a pendulum shaft piston (not shown).
  • the cooling channel 216 has a circumferential constriction 220.
  • the constriction 220 is formed by exactly two axially offset material elevations 221a, 221b in the two cooling channel walls adjacent to the combustion bowl 213 and the ring section 215.
  • an inner expansion 224 extending to the combustion bowl 213 is formed in the area of the cooling channel base 217.
  • a constriction 220 extending to the uppermost Ring groove of the ring section 215 and an outer extension 225 extending to the top land 214.
  • this cooling effect is also influenced by the fact that the material elevation 221a has a thickness D1 that is greater than the thickness D2 of the material elevation 221b. Consequently, the inner extension 224 has a larger radius than the outer extension 225. Accordingly, in this embodiment, the area of the combustion bowl is cooled particularly effectively during engine operation.
  • the material elevation 221b can also have a greater thickness than the material elevation 221a, so that in this case the outer extension 225 has a larger radius than the inner extension 224 and consequently the area of the piston crown 213 and the top land 214 is cooled particularly effectively (not shown).
  • the extensions 224, 225 can extend radially inwards or outwards as far as desired within the scope of what is structurally possible, as shown in Fig.3 is indicated by dash-dot lines.
  • the cooling channel bottom 217 and the cooling channel top 218 of the cooling channel 216 are essentially dome-shaped.
  • the constriction 220 has essentially the same distance A from the cooling channel bottom 217 and from the cooling channel top 218 at its narrowest point.
  • the coolant in the area of the cooling channel bottom 217 and in the area of the cooling channel top 218 is forced into a counterclockwise circular flow, as indicated by the circular arrows.
  • the coolant can thus interact several times per piston stroke with the wall of the cooling channel in the area of the piston bottom 212 and the combustion bowl 213. coolant of lower temperature is always accelerated and supplied through the constriction 220.
  • the radial dimension B of the inner widening 224 or the outer widening 225 at their widest point is at least equal to twice the radial dimension b of the constriction 20, i.e. B ⁇ 2 ⁇ b, as shown in Fig.1 using the example of the outer widening 225.
  • less hot coolant can flow downwards, so that the flow of coolant of lower temperature through the constriction 220 in the direction of the cooling channel cover 218 is not significantly impeded and the area of the piston crown 212 is effectively cooled.
  • the piston 210 or the piston upper part 211 can be produced in a manner known per se by casting, forging, sintering, etc.
  • the cooling channel 216 can be produced in a conventional manner by casting with a salt core.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP12755778.3A 2011-07-05 2012-07-04 Kolben für einen verbrennungsmotor Active EP2729689B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011106562 2011-07-05
DE102011116332A DE102011116332A1 (de) 2011-07-05 2011-10-19 Kolben für einen Verbrennungsmotor
PCT/DE2012/000670 WO2013004215A1 (de) 2011-07-05 2012-07-04 Kolben für einen verbrennungsmotor

Publications (2)

Publication Number Publication Date
EP2729689A1 EP2729689A1 (de) 2014-05-14
EP2729689B1 true EP2729689B1 (de) 2024-04-17

Family

ID=47426675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12755778.3A Active EP2729689B1 (de) 2011-07-05 2012-07-04 Kolben für einen verbrennungsmotor

Country Status (8)

Country Link
US (1) US9109530B2 (pt)
EP (1) EP2729689B1 (pt)
JP (1) JP6335781B2 (pt)
KR (1) KR101962988B1 (pt)
CN (1) CN103649509B (pt)
BR (1) BR112014000079B1 (pt)
DE (1) DE102011116332A1 (pt)
WO (1) WO2013004215A1 (pt)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012014192A1 (de) 2012-07-18 2014-01-23 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102012215541A1 (de) 2012-08-31 2014-03-06 Mahle International Gmbh Kolben
JP6209382B2 (ja) * 2013-07-24 2017-10-04 日立オートモティブシステムズ株式会社 内燃機関のピストンと該ピストン製造方法及び製造装置
WO2017150321A1 (ja) * 2016-03-02 2017-09-08 本田技研工業株式会社 内燃機関のピストン及びその製造方法
DE102016224280A1 (de) * 2016-06-02 2017-12-07 Mahle International Gmbh Kolben einer Brennkraftmaschine
DE102019213953A1 (de) * 2019-09-12 2021-03-18 Mahle International Gmbh Kolben für eine Brennkraftmaschine
DE102019219614A1 (de) * 2019-12-13 2021-06-17 Mahle International Gmbh Kolben für eine Brennkraftmaschine
US11326549B2 (en) * 2020-01-21 2022-05-10 Ford Global Technologies, Llc 218-0266 volcano-shaped inlet of piston oil-cooling gallery
DE102020207512A1 (de) 2020-06-17 2021-12-23 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens
CN114278455B (zh) 2020-09-27 2023-12-19 马勒汽车技术（中国）有限公司 具有分流式内冷流道的活塞
WO2022120178A2 (en) * 2020-12-03 2022-06-09 Cummins Inc. Piston, block assembly, and method for cooling
DE102021203241A1 (de) 2021-03-30 2022-10-06 Mahle International Gmbh Kolben für eine Brennkraftmaschine und Verfahren zur Herstellung des Kolbens
DE102021211034A1 (de) 2021-09-30 2023-03-30 Mahle International Gmbh Kolben

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US2244008A (en) * 1939-06-16 1941-06-03 Gen Motors Corp Piston construction
US3349672A (en) * 1964-11-25 1967-10-31 Mahle Kg Piston for internal combustion engines
JP2003138984A (ja) * 2001-11-02 2003-05-14 Yanmar Co Ltd 内燃機関のピストン構造
JP2004285942A (ja) * 2003-03-24 2004-10-14 Kubota Corp エンジン
DE102004027974A1 (de) * 2004-06-08 2005-12-29 Mahle Gmbh Gebauter Kolben und Verfahren zur Vermeidung von Beschädigungen in Kontakt zueinander stehender Flächen des Oberteiles und des Unterteiles des Kolbens
DE102006053179A1 (de) * 2005-11-10 2007-05-16 Ks Kolbenschmidt Gmbh Einteiliger Stahlkolben als Feinguss-Variante mit Kern für die feingusstechnische Herstellung eines Kühlkanales
DE102006013884A1 (de) * 2006-03-25 2007-09-27 Mahle International Gmbh Kolben für einen Verbrennungsmotor
JP2007270813A (ja) * 2006-03-31 2007-10-18 Yamaha Motor Co Ltd 内燃機関用ピストン

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JPS5927119U (ja) * 1982-08-13 1984-02-20 株式会社小松製作所 ピストンの冷却装置
DE3707462A1 (de) 1987-03-07 1988-09-15 Man B & W Diesel Gmbh Oelgekuehlter, mehrteiliger tauchkolben fuer brennkraftmaschinen
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DE102005037175A1 (de) * 2005-08-06 2007-02-08 Mahle International Gmbh Kolben für einen Verbrennungsmotor sowie Abdeckring für den Kühlkanal eines solchen Kolbens
EP1926902B1 (de) * 2005-09-17 2010-04-14 KS Kolbenschmidt GmbH Kolben, insbesondere kühlkanalkolben, mit drei reibschweisszonen
WO2007054299A1 (de) * 2005-11-10 2007-05-18 Ks-Kolbenschmidt Gmbh Einteiliger stahlkolben als feinguss-variante mit kern für die feingusstechnische herstellung eines kühlkanales
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DE102008062219A1 (de) * 2008-12-13 2010-06-17 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102010033879A1 (de) * 2010-08-10 2012-02-16 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor
DE102010033881A1 (de) * 2010-08-10 2012-02-16 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102010056220A1 (de) * 2010-12-24 2012-06-28 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102011106379A1 (de) * 2011-07-04 2013-01-10 Mahle International Gmbh Kolben für einen Verbrennungsmotor
US8671905B2 (en) * 2011-07-12 2014-03-18 Mahle International Gmbh Piston for an internal combustion engine and method for its production

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244008A (en) * 1939-06-16 1941-06-03 Gen Motors Corp Piston construction
US3349672A (en) * 1964-11-25 1967-10-31 Mahle Kg Piston for internal combustion engines
JP2003138984A (ja) * 2001-11-02 2003-05-14 Yanmar Co Ltd 内燃機関のピストン構造
JP2004285942A (ja) * 2003-03-24 2004-10-14 Kubota Corp エンジン
DE102004027974A1 (de) * 2004-06-08 2005-12-29 Mahle Gmbh Gebauter Kolben und Verfahren zur Vermeidung von Beschädigungen in Kontakt zueinander stehender Flächen des Oberteiles und des Unterteiles des Kolbens
DE102006053179A1 (de) * 2005-11-10 2007-05-16 Ks Kolbenschmidt Gmbh Einteiliger Stahlkolben als Feinguss-Variante mit Kern für die feingusstechnische Herstellung eines Kühlkanales
DE102006013884A1 (de) * 2006-03-25 2007-09-27 Mahle International Gmbh Kolben für einen Verbrennungsmotor
JP2007270813A (ja) * 2006-03-31 2007-10-18 Yamaha Motor Co Ltd 内燃機関用ピストン

Also Published As

Publication number Publication date
CN103649509B (zh) 2019-10-15
KR20140050020A (ko) 2014-04-28
WO2013004215A1 (de) 2013-01-10
JP2014520991A (ja) 2014-08-25
US9109530B2 (en) 2015-08-18
BR112014000079B1 (pt) 2021-08-03
EP2729689A1 (de) 2014-05-14
JP6335781B2 (ja) 2018-05-30
CN103649509A (zh) 2014-03-19
KR101962988B1 (ko) 2019-03-27
US20140290618A1 (en) 2014-10-02
BR112014000079A2 (pt) 2017-02-14
DE102011116332A1 (de) 2013-01-10

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