EP2867509A1 - Particular arrangement of a cooling duct connecting bore of a cooling duct - Google Patents

Particular arrangement of a cooling duct connecting bore of a cooling duct

Info

Publication number
EP2867509A1
EP2867509A1 EP13731137.9A EP13731137A EP2867509A1 EP 2867509 A1 EP2867509 A1 EP 2867509A1 EP 13731137 A EP13731137 A EP 13731137A EP 2867509 A1 EP2867509 A1 EP 2867509A1
Authority
EP
European Patent Office
Prior art keywords
cooling channel
piston
cooling
cooling duct
channel
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.)
Ceased
Application number
EP13731137.9A
Other languages
German (de)
French (fr)
Inventor
Michael Albert Janssen
Wolfgang Köhler
Gerhard Luz
Franz Ratzky
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt 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.)
Filing date
Publication date
Application filed by KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP2867509A1 publication Critical patent/EP2867509A1/en
Ceased legal-status Critical Current

Links

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
    • 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
    • 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 
    • F02F3/0015—Multi-part pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
    • 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 
    • F02F3/28—Other pistons with specially-shaped head
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49274—Piston ring or piston packing making

Definitions

  • the invention relates to a method for producing a cooling channel piston according to the preamble of claim 1 and a cooling channel piston of an internal combustion engine produced thereafter.
  • Coolant piston for internal combustion engines are basically known in the art. These have a radially encircling cooling channel arranged behind a ring field, in which a cooling medium, in particular oil circulates. This cooling medium is introduced into the cooling channel via at least one inlet opening, in particular injected, then circulated in the cooling channel and exits again at at least one outlet opening in order to remove the heat in the piston bottom of the cooling channel. Within the cooling channel is around the piston axis around another cooling space, often below a combustion bowl, available. Such a cooling channel piston is known for example from DE 10 2007 018 932 A1.
  • the cooling channel piston of DE 10 2007 018 932 A1 has an outer circumferential annular cooling channel and, approximately below a combustion bowl, a dome-shaped cooling chamber. With this construction, it is possible, for example, that a cooling medium is injected from an injection nozzle via an inlet opening into the outer annular, radially running cooling channel, circulates there and passes via at least one, preferably several, transfer openings into the inner cooling space.
  • the cooling medium can escape from the central cooling chamber via a central bore, through which the piston stroke axis passes, in order to remove the heat in the piston bottom (that is, the region located behind the annular field).
  • a circulation flow in the opposite direction is also possible.
  • the contour of the inner cooling channel (or cooling chamber) is designed according to constant wall thickness towards the combustion chamber recess. Therefore, at any angle to the axis of the transfer hole these holes could be introduced by first with a cutter, the material at the point at which the hole is to be introduced, is lowered and then after a tool change the transfer hole is drilled.
  • this manufacturing step is complicated, since two tools must be used, so that two successive manufacturing steps and / or a tool change is required, which is disadvantageous in particular in the mass production of such cooling channel piston.
  • the invention is therefore based on the object to improve a manufacturing method for crossing holes in cooling channel piston, in particular with regard to reduced production costs. This object is solved by the features of patent claim 1.
  • the contour of the inner surface of the internal cooling channel or cooling space is designed such that, in cross section, the entry angle of the transfer opening is between 85 ° and 95 °, preferably between 87 ° and 93 °, more preferably between 89 ° and 91 °, Finally, preferably exactly 90 °.
  • top, bottom, left, right, front, back, etc. refer exclusively to the example representation and position of the device and other parts selected in the figure. These terms are not meant to be limiting, that is to say that these relationships may change as a result of different working positions and / or mirror-symmetrical design or the like.
  • the FIGURE shows a sectional view of a cooling channel piston 1 produced by the method according to the invention.
  • the cooling channel 1 has a radially encircling cooling channel 2. Below the combustion bowl 3, a cooling space 4 is arranged, which can be filled with a cooling medium, regular engine oil. Between the cooling channel 2 and the cooling chamber 4 are transfer channels 5, designed in particular as holes provided. Through these transfer channels, the cooling medium from the cooling channel can get into the cavity and vice versa.
  • the cooling channel piston 1 is composed of a piston upper part 6 and a piston lower part 7 together. A joining seam 8 forms the contact point between the upper piston part 6 and the lower piston part 7. At the periphery of the cooling channel piston 1 has annular grooves 9 for receiving piston rings, not shown here.
  • the contour of the inner surface of the inner cooling channel 2 or cooling chamber 4 is designed so that in cross section of the entry angle ⁇ of the transfer opening 5 between 85 ° and 95 °, preferably between 87 ° and 93 °, more preferably between 89 ° and 91 °, finally preferably exactly 90 °.

Abstract

The invention relates to a method for producing a cooling duct piston (1) for an internal combustion engine, having the following steps of: producing a top piston part (6) by introducing a combustion bowl, a cooling space (4) of a part of a cooling duct (2) and also overflow ducts (5), producing a bottom piston part (7) by introducing a part of a cooling duct, and joining the piston parts, wherein at least one transfer duct is created by bores. Also claimed is a cooling duct piston produced by the method according to the invention.

Description

B E S C H R E I B U N G  DESCRIPTION
Besondere Anordnung einer Kühlkanalverbindungsbohrung eines Kühlkanales Special arrangement of a cooling passage connecting bore of a cooling channel
Die Erfindung betrifft ein Verfahren zur Herstellung eines Kühlkanalkolbens gemäß dem Oberbegriff des Anspruchs 1 sowie einen danach hergestellten Kühlkanalkolben einer Brennkraftmaschine. The invention relates to a method for producing a cooling channel piston according to the preamble of claim 1 and a cooling channel piston of an internal combustion engine produced thereafter.
Kühlkanalkolben für Brennkraftmaschinen sind grundsätzlich im Stand der Technik bekannt. Diese weisen einen hinter einem Ringfeld angeordneten radial umlaufenden Kühlkanal auf, in dem ein Kühlmedium, insbesondere otoröl zirkuliert. Dieses Kühimedium wird über zumindest eine Zulauföffnung in den Kühlkanal eingebracht, insbesondere eingespritzt, zirkuliert danach in dem Kühlkanal und tritt an zumindest einer Austrittsöffnung wieder aus, um die Wärme im Kolbenboden des Kühlkanales abzuführen. Innerhalb des Kühlkanales ist um die Kolbenachse herum ein weiterer Kühlraum, oftmals unterhalb einer Brennraummulde, vorhanden. Ein solcher Kühlkanalkolben ist beispielsweise aus der DE 10 2007 018 932 A1 bekannt. Coolant piston for internal combustion engines are basically known in the art. These have a radially encircling cooling channel arranged behind a ring field, in which a cooling medium, in particular oil circulates. This cooling medium is introduced into the cooling channel via at least one inlet opening, in particular injected, then circulated in the cooling channel and exits again at at least one outlet opening in order to remove the heat in the piston bottom of the cooling channel. Within the cooling channel is around the piston axis around another cooling space, often below a combustion bowl, available. Such a cooling channel piston is known for example from DE 10 2007 018 932 A1.
Bei diesem bekannten Kühlkanalkolben wird zunächst ein Oberteil und ein Unterteil hergestellt, damit diese beiden Teile hinsichtlich ihrer konstruktiven Merkmale und auch unter verfahrenstechnischen Aspekten optimal hergestellt, das heißt geformt werden können. Nach der Herstellung der beiden Teile werden diese zusammengefügt, wobei besonders vorteilhaft ein Reibschweißverfahren angewandt wird. Im Stand der Technik ist es bekannt, dass der Kühlkanalkolben der DE 10 2007 018 932 A1 einen äußeren umlaufenden ringförmigen Kühlkanal und, in etwa unterhalb einer Brennraummulde, einen domförmigen Kühiraum aufweist. Mit dieser Konstruktion ist es beispielsweise möglich, dass von einer Einspritzdüse über eine Eintrittsöffnung ein Kühlmedium in den äußeren ringförmig radial laufenden Kühikanal eingespritzt wird, dort zirkuliert und über zumindest eine, vorzugsweise mehrere Übertrittsöffnungen in den innenliegenden Kühlraum gelangt. Von dort aus kann das Kühlmedium über eine zentrale Bohrung, durch welche die Kolbenhubachse verläuft, aus dem zentralen Kühlraum austreten, um die Wärme im Kolbenboden {das heißt der hinter dem Ringfeld liegende Bereich) abzuführen. Ein Zirkulationsfluss in der entgegengesetzten Richtung ist selbstverständlich auch möglich. In this known Kühlkanalkolben first an upper part and a lower part is made so that these two parts can be optimally manufactured in terms of their structural features and also under procedural aspects, that is, can be shaped. After the production of the two parts, these are joined together, wherein a friction welding method is particularly advantageously applied. In the prior art, it is known that the cooling channel piston of DE 10 2007 018 932 A1 has an outer circumferential annular cooling channel and, approximately below a combustion bowl, a dome-shaped cooling chamber. With this construction, it is possible, for example, that a cooling medium is injected from an injection nozzle via an inlet opening into the outer annular, radially running cooling channel, circulates there and passes via at least one, preferably several, transfer openings into the inner cooling space. From there, the cooling medium can escape from the central cooling chamber via a central bore, through which the piston stroke axis passes, in order to remove the heat in the piston bottom (that is, the region located behind the annular field). Of course, a circulation flow in the opposite direction is also possible.
Bevor die beiden Teile hergestellt werden, ist es erforderlich, die zumindest eine Übertrittsbohrung ausgehend von dem inneren Kühlraum in Richtung des außenliegenden Kühlkanales einzubringen. Hierzu ist es erforderlich, dass die Kontur des inneren Kühlkanales (beziehungsweise Kühlraumes) nach konstanter Wandstärke hin zur Brenn raummulde ausgelegt wird. Daher konnten in einem beliebigen Winkel zur Achse der Übertrittsbohrung diese Bohrungen dadurch eingebracht werden, dass zuerst mit einem Fräser das Material an der Stelle, an der die Bohrung eingebracht werden soll, angesenkt wird und anschließend nach einem Werkzeugwechsel die Übertrittsbohrung gebohrt wird. Dieser Herstellungsschritt ist jedoch aufwendig, da zwei Werkzeuge eingesetzt werden müssen, so dass zwei nacheinander folgende Herstellungsschritte und / oder ein Werkzeugwechsel erforderlich ist, der insbesondere bei der Serienproduktion solcher Kühlkanalkolben von Nachteil ist. Das Ansenken des Materials in dem Bereich, in dem die Übertrittsbohrung eingebracht werden soll, ist erforderlich, da im Stand der Technik (Figur 2 der DE 10 2007 018 932 A1) die Achse der Übertrittsbohrung nicht im rechten Winkel zu der entsprechenden Wandung des Kühlraumes ausgerichtet ist. Before the two parts are produced, it is necessary to introduce the at least one transfer hole starting from the inner cooling space in the direction of the outer cooling channel. For this purpose, it is necessary that the contour of the inner cooling channel (or cooling chamber) is designed according to constant wall thickness towards the combustion chamber recess. Therefore, at any angle to the axis of the transfer hole these holes could be introduced by first with a cutter, the material at the point at which the hole is to be introduced, is lowered and then after a tool change the transfer hole is drilled. However, this manufacturing step is complicated, since two tools must be used, so that two successive manufacturing steps and / or a tool change is required, which is disadvantageous in particular in the mass production of such cooling channel piston. The lowering of the material in the region in which the transfer hole is to be introduced is necessary since, in the prior art (FIG. 2 of DE 10 2007 018 932 A1), the axis of the transfer hole is not aligned at right angles to the corresponding wall of the cooling space is.
Der Erfindung liegt daher die Aufgabe zu Grunde, ein Herstellverfahren für Übertrittsbohrungen in Kühlkanalkolben zu verbessern, insbesondere im Hinblick auf reduzierte Herstellkosten. Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst. The invention is therefore based on the object to improve a manufacturing method for crossing holes in cooling channel piston, in particular with regard to reduced production costs. This object is solved by the features of patent claim 1.
Erfindungsgemäß ist vorgesehen, dass die Kontur der inneren Oberfläche des inneniiegenden Kühlkanales beziehungsweise Kühlraumes so gestaltet wird, dass im Querschnitt der Eintrittswinkel der Übertrittsöffnung zwischen 85° und 95°, vorzugsweise zwischen 87° und 93°, weiter vorzugsweise zwischen 89° und 91°, schließlich vorzugsweise genau 90° beträgt. Somit wird ein Verlaufen des Bohrers zwecks Einbringung der Übertrittsbohrung vermieden und vor allen Dingen der bisher vorher notwendige Arbeitsgang des Ansenkens kann entfallen. Dadurch reduzieren sich die Prozessschritte und die Prozesszeit, woraus geringere Hersteilkosten resultieren. According to the invention, the contour of the inner surface of the internal cooling channel or cooling space is designed such that, in cross section, the entry angle of the transfer opening is between 85 ° and 95 °, preferably between 87 ° and 93 °, more preferably between 89 ° and 91 °, Finally, preferably exactly 90 °. Thus, a running of the drill for the purpose of introducing the transfer hole is avoided and above all, the previously necessary previously operation of countersinking can be omitted. As a result, the process steps and the process time are reduced, resulting in lower production costs.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Figur näher erläutert. Sie zeigt eine Schnittansicht eines Kühlkanalkolbens mit erfindungsgemäßen Übertrittsbohrungen. An embodiment of the invention will be explained in more detail with reference to the figure. It shows a sectional view of a cooling channel piston with the invention Übertrittsbohrungen.
In der nachfolgenden Figurenbeschreibung beziehen sich Begriffe wie oben, unten, links, rechts, vorne, hinten usw. ausschließlich auf die in der Figur gewählten beispielhaften Darstellung und Position der Vorrichtung und anderer Teile. Diese Begriffe sind nicht einschränkend zu verstehen, das heißt, durch verschiedene Arbeitsstellungen und/oder spiegelsymmetrische Auslegung oder dergleichen können sich diese Bezüge ändern. In the following description of the figures, terms such as top, bottom, left, right, front, back, etc. refer exclusively to the example representation and position of the device and other parts selected in the figure. These terms are not meant to be limiting, that is to say that these relationships may change as a result of different working positions and / or mirror-symmetrical design or the like.
Die Figur zeigt eine Schnittansicht eines nach dem erfindungsgemäßen Verfahren hergestellten Kühlkanalkolbens 1. Der Kühikanalkoiben 1 weist einen radial umlaufenden Kühlkanal 2 auf. Unterhalb der Verbrennungsmulde 3 ist ein Kühlraum 4 angeordnet, der mit einem Kühlmedium, regelmäßig Motoröl, gefüllt werden kann. Zwischen dem Kühlkanal 2 und dem Kühlraum 4 sind Übertrittskanäle 5, ausgeführt insbesondere als Bohrungen, vorgesehen. Durch diese Übertrittskanäle kann das Kühlmedium von dem Kühlkanal in den Hohlraum gelangen und vice versa. Der Kühlkanalkolben 1 wird aus einem Kolbenoberteil 6 und einem Kolbenunterteil 7 zusammengefügt. Eine Fügenaht 8 bildet die Kontaktstelle zwischen dem Kolbenoberteil 6 und dem Kolbenunterteil 7. Am Umfang weist der Kühlkanalkolben 1 Ringnuten 9 zur Aufnahme von hier nicht dargestellten Kolbenringen auf. The FIGURE shows a sectional view of a cooling channel piston 1 produced by the method according to the invention. The cooling channel 1 has a radially encircling cooling channel 2. Below the combustion bowl 3, a cooling space 4 is arranged, which can be filled with a cooling medium, regular engine oil. Between the cooling channel 2 and the cooling chamber 4 are transfer channels 5, designed in particular as holes provided. Through these transfer channels, the cooling medium from the cooling channel can get into the cavity and vice versa. The cooling channel piston 1 is composed of a piston upper part 6 and a piston lower part 7 together. A joining seam 8 forms the contact point between the upper piston part 6 and the lower piston part 7. At the periphery of the cooling channel piston 1 has annular grooves 9 for receiving piston rings, not shown here.
Die Kontur der inneren Oberfläche des innenliegenden Kühlkanales 2 beziehungsweise Kühlraumes 4 ist so gestaltet, dass im Querschnitt der Eintrittswinkel α des Übertrittsöffnung 5 zwischen 85° und 95°, vorzugsweise zwischen 87° und 93°, weiter vorzugsweise zwischen 89° und 91 °, schließlich vorzugsweise genau 90° beträgt. The contour of the inner surface of the inner cooling channel 2 or cooling chamber 4 is designed so that in cross section of the entry angle α of the transfer opening 5 between 85 ° and 95 °, preferably between 87 ° and 93 °, more preferably between 89 ° and 91 °, finally preferably exactly 90 °.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Kühlkanalkoiben1 cooling channel discs
2 Kühlkanal 2 cooling channel
3 Verbrenn ungsmuide 3 combustion mute
4 Kühiraum 4 cooling room
5 Übertrittskanal 5 crossing channel
6 Kolbenoberteil6 piston upper part
7 Kolbenunterteil7 piston lower part
8 Fügenaht 8 jointing
9 Ringnuten α Eintrittswinkel  9 ring grooves α entry angle

Claims

P A T E N T A N S P R Ü C H E Besondere Anordnung einer Kühlkanalverbindungsbohrung eines Kühlkanales PATENT CLAIMS Special arrangement of a cooling channel connecting hole of a cooling channel
1. 1.
Verfahren zur Herstellung eines Kühlkanalkolbens (1) für eine Brennkraftmaschine mit den folgenden Schritten, Method for producing a cooling channel piston (1) for an internal combustion engine with the following steps,
Herstellung eines Kolbenoberteüs (6) unter Einbringung einer Verbrennungsmulde, eines Kühlraumes (4) eines Teiles eines Kühlkanals (2) sowie Übertrittskanälen (5), Production of a piston upper part (6) with the introduction of a combustion bowl, a cooling chamber (4), part of a cooling channel (2) and transfer channels (5),
Herstellung eines Kolbenunterteils (7) unter Einbringung eines Teiles eines Production of a piston lower part (7) by introducing a part of a
Kühlkanals, cooling channel,
Fügen der Kolbenteile, dadurch gekennzeichnet, dass mindestens ein Übergangskanal durch Bohren erzeugt wird. Joining the piston parts, characterized in that at least one transition channel is created by drilling.
2. 2.
Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Kontur der inneren Oberfläche des innenliegenden Kühlkanaies (2) beziehungsweise Kühlraumes (4) so gestaltet wird, dass im Querschnitt der Eintrittswinkel α der Übertrittsöffnung (5) zwischen 85° und 95°, vorzugsweise zwischen 87° und 93°, weiter vorzugsweise zwischen 89° und 91 °, schließlich vorzugsweise genau 90° beträgt. Method according to claim 1, characterized in that the contour of the inner surface of the internal cooling channel (2) or cooling space (4) is designed so that in cross section the entry angle α of the transfer opening (5) is between 85 ° and 95 °, preferably between 87 ° and 93°, more preferably between 89° and 91°, finally preferably exactly 90°.
3. 3.
Kühikanalkoiben einer Brennkraftmaschine, dadurch gekennzeichnet, dass der Kühikanalkoiben gemäß einem Verfahren nach einem der vorhergehenden Ansprüche hergestellt ist. Cooling channel pistons of an internal combustion engine, characterized in that the cooling channel pistons are produced according to a method according to one of the preceding claims.
EP13731137.9A 2012-06-27 2013-06-24 Particular arrangement of a cooling duct connecting bore of a cooling duct Ceased EP2867509A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012211037 2012-06-27
DE102012218963 2012-10-18
PCT/EP2013/063141 WO2014001256A1 (en) 2012-06-27 2013-06-24 Particular arrangement of a cooling duct connecting bore of a cooling duct

Publications (1)

Publication Number Publication Date
EP2867509A1 true EP2867509A1 (en) 2015-05-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13731137.9A Ceased EP2867509A1 (en) 2012-06-27 2013-06-24 Particular arrangement of a cooling duct connecting bore of a cooling duct

Country Status (5)

Country Link
US (1) US10221807B2 (en)
EP (1) EP2867509A1 (en)
CN (1) CN104603436A (en)
DE (1) DE102013211953A1 (en)
WO (1) WO2014001256A1 (en)

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Publication number Priority date Publication date Assignee Title
US9797337B2 (en) 2015-07-10 2017-10-24 Mahle International Gmbh Oil-cooled piston for an internal combustion engine
WO2018192959A1 (en) 2017-04-19 2018-10-25 Ks Kolbenschmidt Gmbh Piston with a structured design
US11098676B1 (en) * 2020-09-21 2021-08-24 GM Global Technology Operations LLC Radial lip piston profile for easy forgeability
DE102021213333A1 (en) 2021-11-26 2023-06-01 Federal-Mogul Nürnberg GmbH Pistons with cooling cavities closed on all sides and filled with cooling medium

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DE7335155U (en) * 1974-12-12 Maschinenfabrik Augsburg Nuernberg Ag Multi-part piston for internal combustion engines, especially large diesel engines
US3613521A (en) * 1968-11-07 1971-10-19 Komatsu Mfg Co Ltd Piston for internal combustion engine
DE102006002949A1 (en) 2006-01-21 2007-08-02 Ks Kolbenschmidt Gmbh Cooling channel piston for an internal combustion engine
DE102007018932A1 (en) 2007-04-21 2008-10-23 Ks Kolbenschmidt Gmbh Load-optimized interior of a piston
DE102008011922A1 (en) * 2008-02-29 2009-09-03 Ks Kolbenschmidt Gmbh Piston for internal combustion engines, produced by means of a multi-orbital friction welding process
DE102008056203A1 (en) * 2008-11-06 2010-05-12 Mahle International Gmbh Multi-part piston for an internal combustion engine and method for its production
DE102010015568A1 (en) * 2010-04-19 2011-10-20 Ks Kolbenschmidt Gmbh Piston upper part of a built or welded piston with extended cooling chambers
DE102011111319A1 (en) * 2011-08-26 2013-02-28 Mahle International Gmbh Piston for an internal combustion engine

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DE102009056917A1 (en) * 2009-12-03 2011-06-09 Mahle International Gmbh Piston manufacturing method for internal combustion engine, involves machining surface of piston lower part after separating piston upper part from piston lower part and before welding piston upper part with piston lower part

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Title
See also references of WO2014001256A1 *

Also Published As

Publication number Publication date
DE102013211953A1 (en) 2014-01-02
US10221807B2 (en) 2019-03-05
WO2014001256A1 (en) 2014-01-03
CN104603436A (en) 2015-05-06
US20150159584A1 (en) 2015-06-11

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