EP1636473B1 - Piston for a combustion engine and casting method for the production thereof - Google Patents

Piston for a combustion engine and casting method for the production thereof Download PDF

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Publication number
EP1636473B1
EP1636473B1 EP04738605A EP04738605A EP1636473B1 EP 1636473 B1 EP1636473 B1 EP 1636473B1 EP 04738605 A EP04738605 A EP 04738605A EP 04738605 A EP04738605 A EP 04738605A EP 1636473 B1 EP1636473 B1 EP 1636473B1
Authority
EP
European Patent Office
Prior art keywords
piston
casting
recesses
hubs
area
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.)
Expired - Fee Related
Application number
EP04738605A
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German (de)
French (fr)
Other versions
EP1636473A1 (en
EP1636473B2 (en
Inventor
Gottfried Schnaitmann
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 GmbH
Original Assignee
Mahle GmbH
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Publication of EP1636473B1 publication Critical patent/EP1636473B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B22D19/0027—Cylinders, pistons 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 
    • 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
    • Y10T29/49249—Piston making
    • 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
    • Y10T29/49249—Piston making
    • Y10T29/49256—Piston making with assembly or composite article making
    • Y10T29/49261—Piston making with assembly or composite article making by composite casting or molding

Definitions

  • the invention relates to a piston for an internal combustion engine according to the preamble of claim 1 and a method for its production according to the preamble of claim 2.
  • a piston is known whose formed on a cylindrically shaped, upper portion of the piston pin bosses are set back relative to the edge of the upper region, so that when pouring the piston in the bottom of the overhang formed thereby near the pin bosses recesses can be formed.
  • a mold is used which contains a pivotable window insert with a casting core per recess, but which can only produce those recesses from which the casting core can be easily removed after casting.
  • the disadvantage here is that a very complicated mechanism is required to keep the casting mold during casting of the piston exactly in the space provided and move away obliquely downwards from the piston after casting and pull it out of the molding.
  • the known from the prior art molding no incisions, which allows a production of ribs in the recess, which brings about the further disadvantage that the piston known from the latter prior art has only a low mechanical strength.
  • the invention has the object to avoid the disadvantages of the cited prior art.
  • the problem is solved with the features in the characteristics of the main claim and the dependent claim.
  • An expedient embodiment of the invention is the subject of the dependent claim.
  • the subject matter of the second claim combines the advantages of a hinged window insert, which can be made on casting technology simple way recesses for which linearly movable slide are unsuitable, with the advantages of a salt core, the unlimited potential for possibilities of designing cavities in the piston offers.
  • a piston 1 is shown in half section, the left half of which lies on the longitudinal axis 2 of a piston pin, not shown, section of the piston and the right half of a side view of the piston 1, in which a coated portion 3 of a piston shaft 4 can be seen.
  • the piston 1 is designed as a box piston, ie, below a circular cylindrical and the piston rings receiving, upper portion 5 is a lower portion 6, which has an approximately box-shaped cross-section, in which the hubs 7 and the box walls in the region of the hubs 7 to the piston center axis are drawn in, and in which only the lying in the region of the pressure and the counterpressure side shaft wall sections in section have the shape of segments of a circle whose diameter corresponds to the piston diameter.
  • the piston 1 has two elevations 9 and 10, which are arranged on both sides of a combustion chamber trough 11 formed in the piston crown.
  • elevations 9 and 10 of the center of gravity of the piston 1 is not displaced too far upwards in the direction of the combustion chamber trough 11, are in the casting of the piston 1 in the combustion chamber troughs 9, 10 to the lower portion 6 of the piston 1 open recesses 12 and also formed in the region between the hubs 7 and the upper portion 5 undercuts 13 which are formed nose-shaped in cross section in the present embodiment and each aligned to the piston center axis 8 out but also any other shape suitable for reducing the weight of the piston.
  • the mass center of gravity of the piston 1 in the direction of the hubs 7 is displaced by the material saved thereby.
  • the casting mold for casting the piston 1 has a pivotable window insert 14 for each of the recesses 12 to be produced in the two elevations 9 and 10.
  • a prefabricated salt mold part 15 is applied before the casting of the piston 1 on the window insert 14, the shape of which is identical to the shape of the recess 12 including the undercut 13.
  • Das Salt mold part 15 is secured against rotation on the window insert 14 via two conical projections 16 arranged on the window insert 14, onto which the salt mold part 15 is slipped.
  • the window insert 14 is shown in section, which is why only one of the two extensions 16 can be seen. With pivoted-in window insert 14 and salt molding 15 mounted thereon, the piston blank 1 is poured.
  • FIG. 3 illustrated piston blank 1 which has the recesses 12 with the undercuts 13, wherein these recesses 12, as well as in FIG. 4 are divided by ribs 17,17 ', which serve to improve the dimensional stability of the walls 18 of the elevations 9 and 10. This allows to make the walls 18 very thin, thereby achieving improved cooling of the upper portion 5 of the piston 1 by spraying with cooling oil.
  • the bottom view of the piston according to FIG. 4 shows the kidney-shaped configuration of the recesses 12, 12 'with the dashed lines undercuts 13, 13', which are divided in the present embodiment of two ribs 17, 17 '.
  • the shape and the arrangement of the ribs 17, 17 'in a simple manner by a corresponding design of the salt-molded part 15 are taken into account.
  • the shape of the salt mold part 15 corresponds to the negative shape shown in the figures of the recesses 12, 12 'and undercuts 13, 13'.

Description

Die Erfindung betrifft einen Kolben für einen Verbrennungsmotor nach dem Oberbegriff des Anspruches 1 und ein Verfahren zu dessen Herstellung nach dem Oberbegriff des Anspruches 2.The invention relates to a piston for an internal combustion engine according to the preamble of claim 1 and a method for its production according to the preamble of claim 2.

Aus der Offenlegungsschrift DE 199 22 809 A1 ist ein Kolben bekannt, dessen an einen zylindrisch ausgebildeten, oberen Bereich des Kolbens angeformte Bolzennaben gegenüber dem Rand des oberen Bereiches zurückgesetzt sind, sodass beim Gießen des Kolbens in die Unterseite des dadurch gebildeten Überhanges nahe den Bolzennaben Aussparungen eingeformt werden können. Verwendet wird hierzu eine Gießform, die einen schwenkbaren Fenstereinsatz mit einem Gießkern pro Aussparung enthält, der jedoch nur solche Aussparungen erzeugen kann, aus denen sich der Gießkern nach dem Gießen problemlos herausziehen lässt. Dies hat den Nachteil, dass hierdurch das Gewicht des oberen Bereiches des Kolbens nicht so weit verringert werden kann, dass der Massenschwerpunkt des Kolbens für einen problemlosen Motorbetrieb so weit wie möglich in den unteren Bereich des Kolbens verlagert werden kann.From the publication DE 199 22 809 A1 a piston is known whose formed on a cylindrically shaped, upper portion of the piston pin bosses are set back relative to the edge of the upper region, so that when pouring the piston in the bottom of the overhang formed thereby near the pin bosses recesses can be formed. For this purpose, a mold is used which contains a pivotable window insert with a casting core per recess, but which can only produce those recesses from which the casting core can be easily removed after casting. This has the disadvantage that as a result the weight of the upper portion of the piston can not be reduced so much that the center of mass of the piston for smooth engine operation can be displaced as far as possible in the lower region of the piston.

Aus der Offenlegungsschrift DE 101 42 980 A1 ist es bekannt, auf einem schräg zur Kolbenachse verschiebbaren Gießwerkzeug einen Formkörper aufzustecken, mit dessen Hilfe beim Gießen eines Kolbens unter dem Boden des Kolbens hinter dessem Ringfeld eine Ausnehmung herstellbar ist, die eine in Richtung der Kolbenachse weisende, nasenförmige Hinterschneidung aufweist. Nach dem Gießen des Kolbens wird das Gießwerkzeug von Kolben schräg nach unten weggezogen, wobei der Formkörper kurzzeitig im Kolben verbleibt, bevor er ausgewaschen wird.From the publication DE 101 42 980 A1 It is known aufzustecken on a slidable obliquely to the piston axis casting mold a molding with the help of which when casting a piston under the bottom of the piston behind its ring field a recess can be produced, which has a pointing in the direction of the piston axis, nose-shaped undercut. After the casting of the piston, the casting tool is pulled away from the piston obliquely downwards, wherein the shaped body briefly remains in the piston before it is washed out.

Nachteilig ist hierbei, dass ein sehr aufwendiger Mechanismus erforderlich ist, um das Gießwerkzeug beim Gießen des Kolbens exakt in der dafür vorgesehenen Position zu halten und nach dem Guss schräg nach unten vom Kolben wegzubewegen und aus dem Formkörper herauszuziehen. Zudem weist das aus dem Stand der Technik bekannte Formteil keine Einschnitte auf, die eine Herstellung von Rippen in der Ausnehmung ermöglicht, was den weiteren Nachteil mit sich bringt, dass der aus dem letztgenannten Stand der Technik bekannte Kolben nur eine geringe mechanische Festigkeit aufweist.The disadvantage here is that a very complicated mechanism is required to keep the casting mold during casting of the piston exactly in the space provided and move away obliquely downwards from the piston after casting and pull it out of the molding. In addition, the known from the prior art molding no incisions, which allows a production of ribs in the recess, which brings about the further disadvantage that the piston known from the latter prior art has only a low mechanical strength.

Aus der Europäischen Patentanmeldung EP 0 364 810 A2 ist ein Kolben mit einer Verbrennungsmulde im Kolbenboden bekannt, deren Unterseite über Stege mit Bolzennaben verbunden ist. Im Bereich des Kolbenbodens und radial außen weist der Kolben zudem eine nach unten offene Aussparung in Form eines Kühlkanals auf, deren radial innerer Bereich von den Stegen unterteilt wird. Da die Stege jedoch nicht bis zu dem Gürtel reichen, der die Aussparung radial außen begrenzt, ergibt sich der Nachteil, dass die mechanische Festigkeit des kolbenbodenseitigen Bereiches des aus der EP-Anmeldung bekannten Kolbens radial außen sehr gering ist.From the European patent application EP 0 364 810 A2 a piston with a combustion bowl in the piston head is known, the underside of which is connected via webs with pin bosses. In the region of the piston head and radially outside, the piston also has a downwardly open recess in the form of a cooling channel, whose radially inner region is divided by the webs. However, since the webs do not extend to the belt, which limits the recess radially outward, there is the disadvantage that the mechanical strength of the piston bottom side region of the piston known from the EP application is very small radially outward.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, die Nachteile des genannten Stand der Technik zu vermeiden. Gelöst wird die Aufgabe mit den im Kennzeichen des Hauptanspruches und des Nebenanspruches stehenden Merkmalen. Eine zweckmäßige Ausgestaltung der Erfindung ist Gegenstand des Unteranspruches.On this basis, the invention has the object to avoid the disadvantages of the cited prior art. The problem is solved with the features in the characteristics of the main claim and the dependent claim. An expedient embodiment of the invention is the subject of the dependent claim.

Der Gegenstand des 2. Anspruchs kombiniert die Vorteile eines schwenkbaren Fenstereinsatzes, mit dem auf gießtechnisch einfache Weise Aussparungen hergestellt werden können, für die linear bewegliche Schieber ungeeignet sind, mit den Vorteilen eines Salzkernes, der ein unbegrenztes Potenzial an Möglichkeiten der Gestaltung von Hohlräumen im Kolben bietet.The subject matter of the second claim combines the advantages of a hinged window insert, which can be made on casting technology simple way recesses for which linearly movable slide are unsuitable, with the advantages of a salt core, the unlimited potential for possibilities of designing cavities in the piston offers.

Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigen

Fig. 1
einen teilweise geschnittenen Kolben nach dem Guss mit eingesetztem Salzformteil, befestigt auf einem schwenkbaren Fenstereinsatz,
Fig. 2
den Kolben mit eingesetztem Salzformteil und auswärts geschwenktem Fenstereinsatz, der sich vom Salzformteil gelöst hat,
Fig. 3
den teilweise geschnittenen Kolben, nachdem das Salzformteil ausgewaschen ist, und
Fig. 4
eine Untersicht des Kolbens gemäß der Erfindung.
An embodiment of the invention will be described below with reference to the drawings. Show it
Fig. 1
a partially cut piston after casting with inserted salt molding, mounted on a pivoting window insert,
Fig. 2
the piston with inserted salt molding and outwardly pivoted window insert, which has detached from the salt molding,
Fig. 3
the partially cut piston after the salt molding is washed out, and
Fig. 4
a bottom view of the piston according to the invention.

In Fig. 1 ist ein Kolben 1 im Halbschnitt dargestellt, dessen linke Hälfte einen auf der Längsachse 2 eines nicht dargestellten Kolbenbolzens liegenden Schnitt des Kolbens und dessen rechte Hälfte eine Seitenansicht des Kolbens 1 zeigt, bei der ein beschichteter Bereich 3 eines Kolbenschaftes 4 erkennbar ist. Der Kolben 1 ist als Kastenkolben ausgebildet, d.h., unterhalb eines kreiszylindrischen und die Kolbenringe aufnehmenden, oberen Bereiches 5 befindet ein unterer Bereich 6, der einen näherungsweise kastenförmigen Querschnitt aufweist, bei dem die Naben 7 und die Kastenwände im Bereich der Naben 7 zur Kolbenmittelachse 8 hin eingezogen sind, und bei dem nur die im Bereich der Druck- und der Gegendruckseite liegenden Schaftwandabschnitte im Schnitt die Form von Segmenten eine Kreises aufweisen, dessen Durchmesser dem Kolbendurchmesser entspricht.In Fig. 1 a piston 1 is shown in half section, the left half of which lies on the longitudinal axis 2 of a piston pin, not shown, section of the piston and the right half of a side view of the piston 1, in which a coated portion 3 of a piston shaft 4 can be seen. The piston 1 is designed as a box piston, ie, below a circular cylindrical and the piston rings receiving, upper portion 5 is a lower portion 6, which has an approximately box-shaped cross-section, in which the hubs 7 and the box walls in the region of the hubs 7 to the piston center axis are drawn in, and in which only the lying in the region of the pressure and the counterpressure side shaft wall sections in section have the shape of segments of a circle whose diameter corresponds to the piston diameter.

Der Kolben 1 weist zwei Überhöhungen 9 und 10 auf, die beiderseits einer im Kolbenboden eingeformten Brennraummulde 11 angeordnet sind. Damit durch diese Überhöhungen 9 und 10 der Schwerpunkt des Kolbens 1 nicht zu weit nach oben in Richtung Brennraummulde 11 verlagert wird, werden beim Gießen des Kolbens 1 in die Brennraummulden 9, 10 zum unteren Bereich 6 des Kolbens 1 hin offene Aussparungen 12 und zudem in den Bereich zwischen den Naben 7 und dem oberen Bereich 5 Hinterschneidungen 13 eingeformt, die im vorliegenden Ausführungsbeispiel im Querschnitt nasenförmig ausgebildet und jeweils zur Kolbenmittelachse 8 hin ausgerichtet sind, die aber auch jede andere Form haben können, die dazu geeignet ist, das Gewicht des Kolbens zu verringern. Durch das hierbei eingesparte Material wird zudem der Massenschwerpunkt des Kolbens 1 in Richtung Naben 7 verlagert.The piston 1 has two elevations 9 and 10, which are arranged on both sides of a combustion chamber trough 11 formed in the piston crown. Thus, by these elevations 9 and 10 of the center of gravity of the piston 1 is not displaced too far upwards in the direction of the combustion chamber trough 11, are in the casting of the piston 1 in the combustion chamber troughs 9, 10 to the lower portion 6 of the piston 1 open recesses 12 and also formed in the region between the hubs 7 and the upper portion 5 undercuts 13 which are formed nose-shaped in cross section in the present embodiment and each aligned to the piston center axis 8 out but also any other shape suitable for reducing the weight of the piston. In addition, the mass center of gravity of the piston 1 in the direction of the hubs 7 is displaced by the material saved thereby.

Hierbei weist die Gießform zum Gießen des Kolbens 1 für jede der in den beiden Überhöhungen 9 und 10 zu erzeugenden Aussparungen 12 einen schwenkbaren Fenstereinsatz 14 auf. Um hiermit die Hinterschneidungen 13 in den oberen Bereich 5 des Kolbens 1 einformen zu können, wird vor dem Gießen des Kolbens 1 auf den Fenstereinsatz 14 ein vorgefertigtes Salzformteil 15 aufgebracht, dessen Form identisch ist mit der Form der Aussparung 12 einschließlich der Hinterschneidung 13. Das Salzformteil 15 wird auf dem Fenstereinsatz 14 verdrehsicher über zwei auf dem Fenstereinsatz 14 angeordnete kegelförmigen Fortsätze 16 befestigt, auf die das Salzformteil 15 aufgesteckt wird. In den Figuren 1 und 2 ist der Fenstereinsatz 14 im Schnitt dargestellt, weshalb nur einer der beiden Fortsätze 16 zu sehen ist. Mit eingeschwenktem Fenstereinsatz 14 und darauf befestigtem Salzformteil 15 wird der Kolbenrohling 1 gegossen.In this case, the casting mold for casting the piston 1 has a pivotable window insert 14 for each of the recesses 12 to be produced in the two elevations 9 and 10. In order hereby to be able to mold the undercuts 13 in the upper region 5 of the piston 1, a prefabricated salt mold part 15 is applied before the casting of the piston 1 on the window insert 14, the shape of which is identical to the shape of the recess 12 including the undercut 13. Das Salt mold part 15 is secured against rotation on the window insert 14 via two conical projections 16 arranged on the window insert 14, onto which the salt mold part 15 is slipped. In the Figures 1 and 2 the window insert 14 is shown in section, which is why only one of the two extensions 16 can be seen. With pivoted-in window insert 14 and salt molding 15 mounted thereon, the piston blank 1 is poured.

Im Anschluss an den Gießvorgang wird gemäß Figur 2 gemeinsam mit dem Öffnen der übrigen in den Figuren nicht dargestellten Gießform der Fenstereinsatz 14 im Uhrzeigersinn verschwenkt, wobei sich das Salzformteil 15 vom Fenstereinsatz 14 löst und im Kolbenrohling 1 verbleibt, um anschließend ausgewaschen zu werden.Following the casting process is in accordance with FIG. 2 pivoted together with the opening of the other mold, not shown in the figures, the window insert 14 in a clockwise direction, wherein the salt mold part 15 detaches from the window insert 14 and remains in the piston blank 1, to be washed out subsequently.

Hierbei ergibt sich der in Figur 3 dargestellte Kolbenrohling 1, der die Aussparungen 12 mit den Hinterschneidungen 13 aufweist, wobei diese Aussparungen 12, wie auch in Figur 4 dargestellt ist, von Rippen 17,17' unterteilt sind, die der Verbesserung der Formfestigkeit der Wände 18 der Überhöhungen 9 und 10 dienen. Dies erlaubt, die Wände 18 sehr dünn auszugestalten, um dadurch eine verbesserte Kühlung des oberen Bereiches 5 des Kolbens 1 durch Ansprühen mit Kühlöl zu erreichen.This results in the FIG. 3 illustrated piston blank 1, which has the recesses 12 with the undercuts 13, wherein these recesses 12, as well as in FIG. 4 are divided by ribs 17,17 ', which serve to improve the dimensional stability of the walls 18 of the elevations 9 and 10. This allows to make the walls 18 very thin, thereby achieving improved cooling of the upper portion 5 of the piston 1 by spraying with cooling oil.

Die Untersicht des Kolbens gemäß Figur 4 zeigt die nierenförmige Ausgestaltung der Aussparungen 12, 12' mit den gestrichelt eingezeichneten Hinterschneidungen 13, 13', die im vorliegenden Ausführungsbeispiel von je zwei Rippen 17, 17' unterteilt sind. Bei der Herstellung des hierbei verwendeten Salzformteiles 15 kann die Form und die Anordnung der Rippen 17, 17' auf einfache Weise durch eine entsprechende Gestaltung des Salzformteiles 15 berücksichtigt werden. Beim dargestellten Ausführungsbeispiel entspricht die Form des Salzformteiles 15 der in den Figuren gezeigten Negativform der Aussparungen 12, 12' und Hinterschneidungen 13, 13'. Hierbei zeigen die Figuren 1 und 2 Schnittdarstellungen des Salzformteiles 15, das einstückig ausgebildet ist und zur Bildung der in den Figuren 3 und 4 dargestellten Rippen 17, 17' Einschnitte aufweist, die in ihrer Form und Tiefe der Form der Rippen 17 gemäß Figur 3 entsprechen, und deren Anordnung der Anordnung der Rippen 17, 17' gemäß Figur 4 entspricht.The bottom view of the piston according to FIG. 4 shows the kidney-shaped configuration of the recesses 12, 12 'with the dashed lines undercuts 13, 13', which are divided in the present embodiment of two ribs 17, 17 '. In the preparation of the salt mold part 15 used in this case, the shape and the arrangement of the ribs 17, 17 'in a simple manner by a corresponding design of the salt-molded part 15 are taken into account. In the illustrated embodiment, the shape of the salt mold part 15 corresponds to the negative shape shown in the figures of the recesses 12, 12 'and undercuts 13, 13'. This show the Figures 1 and 2 Sectional views of the salt-molded part 15, which is integrally formed and to form the in the FIGS. 3 and 4 illustrated ribs 17, 17 'has incisions in the shape and depth of the shape of the ribs 17 according to FIG. 3 correspond, and their arrangement of the arrangement of the ribs 17, 17 'in accordance with FIG. 4 equivalent.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Kolben, KolbenrohlingPiston, piston blank
22
Bolzenachsepin axis
33
beschichteter Bereichcoated area
44
Kolbenschaftpiston shaft
55
oberer Bereichupper area
66
unterer Bereichlower area
77
Nabehub
88th
KolbenmittelachsePiston central axis
99
seitliche Überhöhunglateral elevation
1010
seitliche Überhöhunglateral elevation
1111
BrennraummuldeCombustion bowl
12, 12'12, 12 '
Aussparungrecess
13, 13'13, 13 '
Hinterschneidungundercut
1414
FenstereinsatzFenstereinsatz
1515
SalzformteilSalt form part
1616
kegelförmiger Fortsatzcone-shaped extension
17, 17'17, 17 '
Rippenribs
1818
Wandwall

Claims (3)

  1. A piston (1) for an internal combustion engine, said piston consisting of
    - an approximately circular cylindrical upper area (5) for receiving annular grooves and
    - a lower area (6) having two hubs (7) for receiving a piston pin, which hubs are set back toward the piston central axis (8),
    - wherein in the upper area (5), recesses (12, 12') are arranged in the area of the hubs (7), which recesses are open toward the lower area (6) and have molded undercuts (13, 13') in the area between the hubs (7) and the upper area (5),
    characterized in that the recesses (12, 12') are subdivided in each case by at least one rib (17, 17') which is arranged in the radial direction.
  2. A casting method for producing a piston, wherein a casting mold having pivotable window inserts (14) is used for producing recesses (12, 12'),
    comprising the following method steps:
    - producing salt mold parts (15) by means of which, when casting the piston (1), the recesses (12, 12') and also undercuts (13, 13') projecting into the area between the hubs (7) and the upper area (5) of the piston (1) can be generated,
    - introducing notches into the salt mold parts (15) for producing ribs (17, 17') arranged in the recesses (12, 12') and in the undercuts (13, 13') when casting the piston (1),
    - securing the salt mold parts (15) on the respective window inserts (14),
    - casting the piston (1),
    - pivoting the window inserts (14) away from the finished casted piston (1), wherein the salt mold parts disengage from the window inserts and remain within the piston, and
    - washing the salt mold parts (15) out of the piston (1).
  3. The casting method according to claim 2, characterized in that the window inserts (14) have in each case at least two conical extensions (16) onto which the respective salt mold parts (15) are attached.
EP04738605.7A 2003-06-07 2004-06-07 Piston for a combustion engine and casting method for the production thereof Expired - Fee Related EP1636473B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10325917A DE10325917A1 (en) 2003-06-07 2003-06-07 Piston for an internal combustion engine and casting process for its production
PCT/DE2004/001151 WO2004111419A1 (en) 2003-06-07 2004-06-07 Piston for a combustion engine and casting method for the production thereof

Publications (3)

Publication Number Publication Date
EP1636473A1 EP1636473A1 (en) 2006-03-22
EP1636473B1 true EP1636473B1 (en) 2012-12-19
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US (1) US7213562B2 (en)
EP (1) EP1636473B2 (en)
JP (1) JP4741479B2 (en)
KR (1) KR101119174B1 (en)
BR (1) BRPI0411089B1 (en)
DE (1) DE10325917A1 (en)
WO (1) WO2004111419A1 (en)

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DE102013013962A1 (en) * 2013-08-23 2015-02-26 Mahle International Gmbh Assembly of a piston and a Anspritzdüse for an internal combustion engine
US9662707B2 (en) * 2013-09-27 2017-05-30 Honda Foundry Co., Ltd. Piston casting method and piston casting device
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KR101615274B1 (en) * 2015-09-04 2016-04-25 동양피스톤 주식회사 eco mold device for producing piston and mold device for producing piston and piston producing method
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BRPI0411089B1 (en) 2015-07-28
WO2004111419A1 (en) 2004-12-23
BRPI0411089A (en) 2006-07-25
DE10325917A1 (en) 2005-03-31
EP1636473A1 (en) 2006-03-22
KR101119174B1 (en) 2012-02-21
WO2004111419B1 (en) 2005-04-07
JP2006527325A (en) 2006-11-30
EP1636473B2 (en) 2016-03-16
KR20060035615A (en) 2006-04-26
JP4741479B2 (en) 2011-08-03
US7213562B2 (en) 2007-05-08
US20060118076A1 (en) 2006-06-08

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