EP3615784B1 - Piston monobloc coulé destiné à un moteur à combustion interne - Google Patents

Piston monobloc coulé destiné à un moteur à combustion interne Download PDF

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Publication number
EP3615784B1
EP3615784B1 EP18721724.5A EP18721724A EP3615784B1 EP 3615784 B1 EP3615784 B1 EP 3615784B1 EP 18721724 A EP18721724 A EP 18721724A EP 3615784 B1 EP3615784 B1 EP 3615784B1
Authority
EP
European Patent Office
Prior art keywords
piston
internal combustion
rib
combustion engine
axis
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
EP18721724.5A
Other languages
German (de)
English (en)
Other versions
EP3615784A1 (fr
Inventor
Sven Ungermann
Georg HOPP
Rainer Weiss
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.)
Federal Mogul Nuernberg GmbH
Original Assignee
Federal Mogul Nuernberg GmbH
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.)
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Publication date
Application filed by Federal Mogul Nuernberg GmbH filed Critical Federal Mogul Nuernberg GmbH
Publication of EP3615784A1 publication Critical patent/EP3615784A1/fr
Application granted granted Critical
Publication of EP3615784B1 publication Critical patent/EP3615784B1/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
    • F02F3/00—Pistons 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • 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
    • 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 
    • F02F3/0084—Pistons  the pistons being constructed from specific materials
    • 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
    • F02F3/18—Pistons  having cooling means the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston
    • 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 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • 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 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of 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
    • 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

Definitions

  • the invention relates to a one-piece, cast piston for an internal combustion engine.
  • a key requirement for pistons in internal combustion engines is to be able to withstand both the temperatures that occur and the mechanical loads. This must also be achieved by using a piston with the lowest possible weight.
  • the DE 10 2013 214 738 A1 relates to a piston cast from aluminum or an aluminum alloy with ribs on the underside of the piston.
  • Other pistons for an internal combustion engine are known from WO 2006/014741 A2 , US4428330A , US3703126A , DE 102013214738 A1 , EN102014210875A1 and DE 102012008690 A1 .
  • the object of the invention is to provide a piston for an internal combustion engine Create that is improved over the above piston and also meets the requirements.
  • the piston according to the invention for an internal combustion engine is designed and cast in one piece. Furthermore, it has at least one cooling channel and a rib, which is formed on the inside of the piston opposite, or to put it another way, opposite to the bowl bottom of a combustion chamber bowl, in other words on the side of the piston pin boss.
  • the base of the bowl is understood to mean a “bottom” with a largely constant thickness, which delimits the combustion chamber bowl from the underside of the piston.
  • the bottom is thickened in some areas.
  • the piston crown has the combustion bowl formed therein on its upper side, and the piston underside has the ribs, without these contours being related in the manner according to the invention.
  • the cooling channel extends in the direction of the piston axis essentially over all annular grooves and its lower edge is in the direction of the piston axis essentially at the same level as the lower groove flank of the lowest annular groove and/or the lowest point of the combustion bowl.
  • the piston can be produced efficiently, and production by casting opens up a wide range of design options.
  • the rib which will be described in more detail below, can be designed with a shape obtained by forging cannot be produced or cannot be produced economically, for example due to high wear in the forging die.
  • the rib according to the invention formed on the underside of the piston ie the side of the bowl base of a combustion chamber bowl facing away from the combustion area, reinforces and stiffens this mechanically highly stressed area and thereby improves the overall strength properties of the piston.
  • the at least one rib has an advantageous effect with regard to the dissipation of the heat generated in that the heat-conducting cross section is enlarged, and the temperature can thus be reduced in the area of the piston that is also subjected to the highest thermal loads.
  • the piston according to the invention thus meets the requirements in a particularly good manner and can also be produced efficiently.
  • the rib can already be brought into its final shape by casting using appropriate molds, so that post-processing is advantageously unnecessary.
  • the piston according to the invention is preferably used for a diesel engine.
  • At least one rib in the direction of a substantially extends at most from the piston axis remote area of a piston pin boss.
  • at least one rib extends to a left or right area of the gudgeon pin boss, preferably two ribs in the direction of the two mentioned areas.
  • the piston according to the invention is preferably made of an iron material, steel or cast iron. Due to their comparatively high strength, these materials offer the possibility of realizing particularly thin wall thicknesses and thus advantageously saving weight.
  • the inherent thermal conductivity of such materials, which is lower compared to other materials, is compensated according to the invention by the above-described heat dissipation effect of the at least one rib.
  • the piston according to the invention can have one or more coolant inlets and outlets in a known manner, the heat dissipation achieved makes it possible to dispense with a continuous exchange of coolant in the cooling channel.
  • coolant inlets and outlets can be avoided, as can measures for filling the cooling channel, such as coolant nozzles.
  • the cooling channel in the piston according to the invention can thus be closed and filled with coolant, and due to the heat dissipation effect of the at least one rib, a sufficiently low temperature can nevertheless be ensured.
  • the figure shows a section of the piston according to the invention perpendicular to the piston pin axis.
  • the piston 10 has in its upper area, in the direction of the piston axis at approximately the same level, an annular zone 12 on the outside, a preferably closed cooling channel 14 radially inside and a combustion bowl 14 in the central area.
  • a thickening or rib 18 is formed on that side of the bowl base which faces away from the combustion chamber, in other words the Piston pin boss 16 faces.
  • two ribs are formed essentially symmetrically, which extend essentially parallel to the piston pin axis, ie perpendicular to the plane of the drawing, to the lateral areas of the piston pin boss 16 .
  • the ribs 18 are each rounded on their upper side, which is the underside in the orientation shown. This applies equally to the adjacent areas of the piston underside, so that the respective rib 18 is viewed essentially from the outside in as a sequence of a concave, a convex and a concave curvature, which in the example shown into the concave curvature of the underside the combustion bowl 14 passes.
  • the described shape of the rib 18 can advantageously be formed when the piston is cast, so that no post-processing is required.

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)

Claims (3)

  1. Piston monobloc coulé (10) pour un moteur à combustion interne, avec un canal de refroidissement (12) et au moins une nervure (18) sur le côté intérieur de piston par rapport à la base d'un bol d'espace de combustion (14),
    dans lequel au moins une nervure (18) s'étend, en cas d'observation du piston en direction de l'axe de boulon de piston, en direction d'une zone se trouvant à distance sensiblement maximale de l'axe de piston d'un moyeu de boulon de piston (16), que le piston est réalisé en un matériau de fer, et qu'une délimitation inférieure du canal de refroidissement (12) se trouve dans le sens axial de piston sensiblement au même niveau qu'un flanc de gorge inférieur d'une gorge annulaire de piston la plus basse et/ou un point le plus bas du bol d'espace de combustion (14).
  2. Piston monobloc coulé (10) pour un moteur à combustion interne selon la revendication 1,
    caractérisé en ce que
    au moins une nervure (18) s'étend sensiblement en direction de l'axe du moyeu de boulon de piston (16).
  3. Piston monobloc coulé (10) pour un moteur à combustion interne selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le canal de refroidissement (12) s'étend dans le sens axial de piston sensiblement sur la zone entière des gorges annulaires de piston.
EP18721724.5A 2017-04-26 2018-04-24 Piston monobloc coulé destiné à un moteur à combustion interne Active EP3615784B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017207005.6A DE102017207005A1 (de) 2017-04-26 2017-04-26 Einteiliger, gegossener Kolben für einen Verbrennungsmotor
PCT/EP2018/060487 WO2018197501A1 (fr) 2017-04-26 2018-04-24 Piston monobloc coulé destiné à un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP3615784A1 EP3615784A1 (fr) 2020-03-04
EP3615784B1 true EP3615784B1 (fr) 2023-05-31

Family

ID=62104249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18721724.5A Active EP3615784B1 (fr) 2017-04-26 2018-04-24 Piston monobloc coulé destiné à un moteur à combustion interne

Country Status (5)

Country Link
US (2) US20210108592A1 (fr)
EP (1) EP3615784B1 (fr)
CN (1) CN110546368A (fr)
DE (1) DE102017207005A1 (fr)
WO (1) WO2018197501A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012008690A1 (de) * 2012-04-28 2013-10-31 Mahle International Gmbh Anordnung aus einem Kolben und einem Kolbenbolzen für einen PKW-Dieselmotor
DE102014210875A1 (de) * 2014-06-06 2015-12-17 Federal-Mogul Nürnberg GmbH Kolben und Verfahren zu dessen Herstellung

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420474A (en) * 1943-07-19 1947-05-13 Specialloid Ltd Piston
FR2079873A5 (fr) * 1970-02-16 1971-11-12 Semt
US4428330A (en) * 1982-09-08 1984-01-31 Kabushiki Kaisha Komatsu Seisakusho Piston for internal combustion engines
JPH1018908A (ja) * 1996-07-01 1998-01-20 Hidaka Eng:Kk 内燃機関用ピストン
DE10110889C1 (de) 2001-03-07 2002-10-02 Ks Kolbenschmidt Gmbh Verfahren zur Herstellung eines Kühlkanalkolbens, sowie ein nach dem Verfahren hergestellter Kühlkanalkolben
US7406941B2 (en) * 2004-07-21 2008-08-05 Federal - Mogul World Wide, Inc. One piece cast steel monobloc piston
DE102004058968A1 (de) * 2004-12-08 2006-06-14 Mahle International Gmbh Zweiteiliger Kolben für einen Verbrennungsmotor
US9046053B2 (en) * 2011-06-29 2015-06-02 Federal-Mogul Corporation Piston with an undercrown support feature
WO2013003546A1 (fr) * 2011-06-29 2013-01-03 Federal-Mogul Corporation Piston avec élément de support sous la tête
DE102013214738A1 (de) * 2013-07-29 2015-01-29 Federal-Mogul Nürnberg GmbH Leichtbau eines Dieselkolbens
US9765727B2 (en) * 2014-03-03 2017-09-19 Federal-Mogul Llc One-piece piston featuring additive machining produced combustion bowl rim and cooling gallery
JP6283751B2 (ja) * 2014-12-02 2018-02-21 日立オートモティブシステムズ株式会社 内燃機関用ピストンの製造装置及び製造方法
US10584659B2 (en) * 2015-03-23 2020-03-10 Tenneco Inc Robust, lightweight, low compression height piston and method of construction thereof
CN109154250A (zh) * 2016-05-27 2019-01-04 本田技研工业株式会社 活塞及其制造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012008690A1 (de) * 2012-04-28 2013-10-31 Mahle International Gmbh Anordnung aus einem Kolben und einem Kolbenbolzen für einen PKW-Dieselmotor
DE102014210875A1 (de) * 2014-06-06 2015-12-17 Federal-Mogul Nürnberg GmbH Kolben und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
EP3615784A1 (fr) 2020-03-04
DE102017207005A1 (de) 2018-10-31
US20220325676A1 (en) 2022-10-13
US20210108592A1 (en) 2021-04-15
CN110546368A (zh) 2019-12-06
WO2018197501A1 (fr) 2018-11-01

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