EP2222947B1 - Cast piston having supporting ribs, and method for the production of such a piston - Google Patents

Cast piston having supporting ribs, and method for the production of such a piston Download PDF

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Publication number
EP2222947B1
EP2222947B1 EP08805008A EP08805008A EP2222947B1 EP 2222947 B1 EP2222947 B1 EP 2222947B1 EP 08805008 A EP08805008 A EP 08805008A EP 08805008 A EP08805008 A EP 08805008A EP 2222947 B1 EP2222947 B1 EP 2222947B1
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EP
European Patent Office
Prior art keywords
piston
cast
crown
supporting ribs
skirt
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EP08805008A
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German (de)
French (fr)
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EP2222947A1 (en
Inventor
Martin NÖDL
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Federal Mogul Nuernberg GmbH
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Federal Mogul Nuernberg GmbH
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    • 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
    • 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
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting

Definitions

  • the invention relates to a cast piston with support ribs for an internal combustion engine and to a method for producing such a piston.
  • Pistons for internal combustion engines are exposed to high mechanical and thermal stresses during operation.
  • the piston structure, the materials used and other design features depending on its intended use, for example, in terms of structural rigidity or its weight can be optimized. Other constraints to consider include cost and longevity.
  • a conflict of objectives lies in maximizing the structural rigidity and minimizing the weight of the piston at the same time.
  • An increase in the structural rigidity can be achieved by reinforcing parts and / or regions of the piston which are subjected to particularly high loads. Such a reinforcement increases the weight of the piston. This in turn entails an increase in consumption and an increase in manufacturing and operating costs.
  • the EP 1 561 938 A1 shows a piston in which ribs are attached to the pin bores, which are completely connected to the piston head along a lower side and are located substantially below the pin bore.
  • the DE 10 2005 043 747 A1 shows a piston for an internal combustion engine, wherein the support ribs are part of the Form the circumference of the piston skirt and are completely connected to the piston crown along the edge facing the piston crown.
  • the ribs known in the art are directed to the field of application, needs and manufacturing limitations of forged pistons.
  • the DE 699 01 902 T2 describes a piston for use in a motor.
  • the piston has a plurality of struts which are provided in the piston skirt.
  • the DE 1 805 533 A refers to a piston for internal combustion engines, wherein the piston has flat inserts which are perpendicular to the pin axis.
  • the GB 431 743 A discloses a piston with struts provided on the piston skirt.
  • the invention is therefore based on the object to provide a cast piston with improved structural rigidity with simultaneous weight optimization and a suitable manufacturing process.
  • a cast piston for an internal combustion engine has a piston head, a cylindrical piston head, which adjoins the piston crown, and an at least partially hollow piston shaft, which is located on the side facing away from the piston crown of the piston head.
  • the cast piston is characterized in that it comprises one or more support ribs which are located at least partially in the piston skirt, and at least one support rib has a recess on the side facing the piston crown.
  • the in the Piston shaft provided support ribs stiffen the piston skirt. Furthermore, by appropriate arrangement of the support ribs targeted areas in which high loads occur and require a stiffening, can be strengthened. Due to a targeted reinforcement can, depending on the scope of the piston, material elsewhere, for example, be reduced to the wall thickness of the piston skirt in favor of its weight optimization.
  • the support ribs are located inside the piston skirt to stiffen areas in the vicinity of bolt holes provided in the peripheral wall of the piston skirt. Recesses of the support ribs on the side facing the piston crown serve to reduce weight in areas that do not require additional stiffening. Furthermore, spray oil and / or guided oil can reach the bolt through these recesses. This allows the piston in the area of the bolt holes and the connecting rod sufficiently cooled and can be better lubricated.
  • the support ribs may be formed integrally with the piston skirt or cast in order to obtain the greatest possible material homogeneity, in particular in those areas which are exposed to great loads. Further, the piston can be manufactured by the one-piece casting without further additional processing of the ribs. The formation of the ribs is thus integrated into the casting process. Such a method is therefore particularly productive and therefore also suitable for the production of large quantities.
  • the support ribs connect to walls of the piston body in the vicinity of the piston bore in order to combine a reinforcement by flanges and support ribs.
  • the cast piston is made of aluminum to reduce the weight of the piston.
  • Aluminum has the necessary heat resistance, lightness and structural rigidity.
  • the support ribs are arranged substantially parallel to the pin axis.
  • the bolt axis is defined by two bolt holes. Such an arrangement effectively enhances the high stress areas around the pin holes.
  • the parallel arrangement of the support ribs to the bolt axis represents the shortest connection of the two opposite bolt body sides, whereby material can be saved and therefore the weight of the piston can be optimized.
  • the support ribs are substantially perpendicular to walls of the piston skirt to optimize the structural rigidity of the piston.
  • the support ribs are formed flat, wherein an edge of such a rib extends substantially parallel to the piston crown and at least one adjoining this edge surface is arranged substantially perpendicular to the piston crown to improve the structural rigidity of the piston.
  • a reinforcement on which there is preferably a mirror-symmetrical support rib on both sides of the bolt holes, promises an effective improvement of the structural rigidity around the heavily stressed areas of the bolt holes.
  • the support ribs are not formed on the piston head. Connecting the support ribs with the piston crown is not necessary, which can be exploited in favor of a lower material consumption.
  • each support rib connects two sides of the piston skirt.
  • the edge of the support ribs facing away from the piston crown is farther from the piston crown than the central axis of the bolt bores, in particular to stiffen the piston skirt.
  • this edge can also be further away from the piston crown than the bolt holes in total, and the recess can extend from the piston crown beyond the central axis and into the region of the end of the bolt bore facing away from the piston crown.
  • the object is further achieved by a method for producing the above cast piston in which the recess is formed, for example by a suitable core, during the casting of the support ribs.
  • Fig. 1 is a perspective view of a cast piston according to the invention.
  • the inventive cast piston 1 in Fig. 1 has a piston head 10 with a piston head 12 and a piston stem 20.
  • the piston head 10 is cylindrical and is provided with annular grooves 11 along its outer periphery.
  • the piston head 10 is followed in the figure upwards (out of the plane of the paper) by the piston shaft 20, which has a cavity 25.
  • the piston shaft 20 must, as in the present case, have no circular cylindrical shape.
  • the piston stem comprises 20 recessed walls, so that the piston shaft 20 approaches a box shape.
  • two opposite pin holes 26 are provided for receiving a bolt.
  • the bolt holes are reinforced with bolt flanges 27.
  • bolt holes 26 may, as it is not shown in the figure, be equipped with a locking ring which is formed in a groove formed in the pin bore 26.
  • a bolt not shown in the figure, which serves as an axis for the small connecting rod eye of a connecting rod (not shown) superimposed.
  • the cavity 25 of the piston 1 is formed so that the connecting rod by an amplitude which is predetermined by the stroke of the piston 1, the connecting rod and the crankshaft, can rotate.
  • Two support ribs 30 extend parallel to the pin axis, which is predetermined by the two pin holes 26.
  • the two support ribs are provided symmetrically on both sides of the pin, not shown, and connect the opposite flattened sides of the piston skirt 20.
  • the ribs 30 are flat and have upper edges 31. Such an upper edge 31 of the support ribs, as implemented in the present embodiment, may be disposed above the centerline of the bolt axis.
  • the upper edge 31 of the support ribs 30 is arranged parallel to the pin axis and parallel to the piston head 12. It may be necessary by casting process, that the ribs 30 are formed double cone-shaped, the parallelism is thus only indicated and the edge 31 bulges in particular in the region of their connection to the piston shaft 20 to the outside.
  • the support ribs 30, which are substantially flat except for the connection region with the piston skirt 20, have cutouts 32.
  • two parallel support ribs 30 must be provided.
  • a support rib may be provided which connects the two flanges 27.
  • additional support ribs in addition to the two parallel support ribs, for example a support rib connecting the two flanges centrally and below the pin bores.
  • the recesses can be made smaller or larger in terms of weight optimization and / or structural stiffness optimization.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention relates to a cast piston for an internal combustion engine having a piston base, a cylindrical piston head connected to the piston base, and pin bores provided in an at least partially hollow piston shaft, which is positioned on the side of the piston head opposite the piston base. The piston has one or more supporting ribs located at least partially in the piston shaft, and at least one supporting rib has a recess on the side facing the piston base.

Description

TECHNISCHES GEBIETTECHNICAL AREA

Die Erfindung betrifft einen Gusskolben mit Stützrippen für einen Verbrennungsmotor sowie ein Verfahren zur Herstellung eines solchen Kolbens.The invention relates to a cast piston with support ribs for an internal combustion engine and to a method for producing such a piston.

STAND DER TECHNIKSTATE OF THE ART

Kolben für Verbrennungsmotoren sind während des Betriebs hohen mechanischen und thermischen Belastungen ausgesetzt. Hierbei kann der Kolbenaufbau, die verwendeten Materialien und andere Gestaltungsmerkmale in Abhängigkeit seines Verwendungszwecks beispielsweise hinsichtlich seiner Struktursteifigkeit oder seines Gewichts optimiert werden. Weitere zu berücksichtigende Nebenbedingungen sind Kosten und Langlebigkeit.Pistons for internal combustion engines are exposed to high mechanical and thermal stresses during operation. Here, the piston structure, the materials used and other design features depending on its intended use, for example, in terms of structural rigidity or its weight can be optimized. Other constraints to consider include cost and longevity.

Hierbei liegt ein Zielkonflikt in der gleichzeitigen Maximierung der Struktursteifigkeit und Minimierung des Gewichts des Kolbens. Eine Erhöhung der Struktursteifigkeit kann dadurch erreicht werden, dass Teile und/oder Bereiche des Kolbens, die besonders hohen Belastungen ausgesetzt sind, verstärkt werden. Eine solche Verstärkung erhöht das Gewicht des Kolbens. Dies wiederum zieht eine Erhöhung des Verbrauchs und eine Erhöhung der Herstellungs- und Betriebskosten nach sich.A conflict of objectives lies in maximizing the structural rigidity and minimizing the weight of the piston at the same time. An increase in the structural rigidity can be achieved by reinforcing parts and / or regions of the piston which are subjected to particularly high loads. Such a reinforcement increases the weight of the piston. This in turn entails an increase in consumption and an increase in manufacturing and operating costs.

Die EP 1 561 938 A1 zeigt einen Kolben, bei dem an den Bolzenbohrungen Rippen angebracht sind, die entlang einer unteren Seite vollständig mit dem Kolbenkopf verbunden sind und sich im Wesentlichen unterhalb der Bolzenbohrung befinden.The EP 1 561 938 A1 shows a piston in which ribs are attached to the pin bores, which are completely connected to the piston head along a lower side and are located substantially below the pin bore.

Die DE 10 2005 043 747 A1 zeigt einen Kolben für einen Verbrennungsmotor, bei dem die Stützrippen einen Teil des Umfangs des Kolbenschafts bilden und entlang der dem Kolbenboden zugewandten Kante vollständig mit dem Kolbenboden verbunden sind.The DE 10 2005 043 747 A1 shows a piston for an internal combustion engine, wherein the support ribs are part of the Form the circumference of the piston skirt and are completely connected to the piston crown along the edge facing the piston crown.

Die im Stand der Technik bekannten Verrippungen sind auf den Anwendungsbereich, die Bedürfnisse und Herstellungsbeschränkungen von geschmiedeten Kolben gerichtet.The ribs known in the art are directed to the field of application, needs and manufacturing limitations of forged pistons.

Die DE 699 01 902 T2 beschreibt einen Kolben zur Anwendung in einem Motor. Der Kolben weist eine Vielzahl von Streben auf, die im Kolbenschaft vorgesehen sind. Die DE 1 805 533 A bezieht sich auf einen Kolben für Brennkraftmaschinen, wobei der Kolben flächige Einsätze aufweist, die senkrecht auf der Bolzenachse stehen. Die GB 431 743 A offenbart einen Kolben mit am Kolbenschaft vorgesehenen Streben.The DE 699 01 902 T2 describes a piston for use in a motor. The piston has a plurality of struts which are provided in the piston skirt. The DE 1 805 533 A refers to a piston for internal combustion engines, wherein the piston has flat inserts which are perpendicular to the pin axis. The GB 431 743 A discloses a piston with struts provided on the piston skirt.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Der Erfindung liegt daher die Aufgabe zugrunde, einen Gusskolben mit verbesserter Struktursteifigkeit bei gleichzeitiger Gewichtsoptimierung sowie ein geeignetes Herstellungsverfahren bereit zu stellen.The invention is therefore based on the object to provide a cast piston with improved structural rigidity with simultaneous weight optimization and a suitable manufacturing process.

Die Aufgabe wird durch den Gegenstand der Ansprüche 1 und 10 gelöst. Weitere vorteilhafte Ausführungsformen folgen aus den Unteransprüchen.The object is solved by the subject matter of claims 1 and 10. Further advantageous embodiments follow from the subclaims.

Danach weist ein Gusskolben für einen Verbrennungsmotor einen Kolbenboden, einen zylindrischen Kolbenkopf, der sich an den Kolbenboden anschließt, und einen wenigstens teilweise hohlen Kolbenschaft auf, der sich an der dem Kolbenboden abgewandten Seite des Kolbenkopfes befindet. Der Gusskolben ist dadurch gekennzeichnet, dass er eine oder mehrere Stützrippen aufweist, die sich zumindest teilweise in dem Kolbenschaft befinden, und zumindest eine Stützrippe eine Aussparung auf der dem Kolbenboden zugewandten Seite aufweist. Die in dem Kolbenschaft vorgesehenen Stützrippen versteifen den Kolbenschaft. Ferner können durch das geeignete Anordnen der Stützrippen gezielt Bereiche, in denen hohe Belastungen auftreten und die einer Versteifung bedürfen, verstärkt werden. Aufgrund einer gezielten Verstärkung kann, in Abhängigkeit des Anwendungsbereichs des Kolbens, Material an anderer Stelle, beispielsweise an der Wandstärke des Kolbenschafts zu Gunsten seiner Gewichtsoptimierung, gespart werden. Die Stützrippen befinden sich im Inneren des Kolbenschafts, um Bereiche in der Nähe von Bolzenbohrungen zu versteifen, die in der Umfangswand des Kolbenschafts vorgesehen sind. Aussparungen der Stützrippen auf der dem Kolbenboden zugewandten Seite dienen zur Gewichtsreduzierung in Bereichen, die einer zusätzlichen Versteifung nicht bedürfen. Ferner kann durch diese Aussparungen Spritzöl und/oder geführtes Öl zum Bolzen gelangen. Dadurch kann der Kolben im Bereich der Bolzenbohrungen und des Pleuels ausreichend gekühlt und besser geschmiert werden kann. Die Stützrippen können mit dem Kolbenschaft einstückig ausgebildet oder eingegossen sein, um eine größtmögliche Materiaihomogenität insbesondere in denjenigen Bereichen zu erhalten, die großen Belastungen ausgesetzt sind. Ferner kann der Kolben durch das einstückige Gießen ohne eine weitere zusätzliche Bearbeitung der Rippen gefertigt werden. Die Ausbildung der Rippen ist somit in den Gießprozess integriert. Ein solches Verfahren ist daher besonders produktiv und daher auch für die Herstellung hoher Stückzahlen geeignet.Thereafter, a cast piston for an internal combustion engine has a piston head, a cylindrical piston head, which adjoins the piston crown, and an at least partially hollow piston shaft, which is located on the side facing away from the piston crown of the piston head. The cast piston is characterized in that it comprises one or more support ribs which are located at least partially in the piston skirt, and at least one support rib has a recess on the side facing the piston crown. The in the Piston shaft provided support ribs stiffen the piston skirt. Furthermore, by appropriate arrangement of the support ribs targeted areas in which high loads occur and require a stiffening, can be strengthened. Due to a targeted reinforcement can, depending on the scope of the piston, material elsewhere, for example, be reduced to the wall thickness of the piston skirt in favor of its weight optimization. The support ribs are located inside the piston skirt to stiffen areas in the vicinity of bolt holes provided in the peripheral wall of the piston skirt. Recesses of the support ribs on the side facing the piston crown serve to reduce weight in areas that do not require additional stiffening. Furthermore, spray oil and / or guided oil can reach the bolt through these recesses. This allows the piston in the area of the bolt holes and the connecting rod sufficiently cooled and can be better lubricated. The support ribs may be formed integrally with the piston skirt or cast in order to obtain the greatest possible material homogeneity, in particular in those areas which are exposed to great loads. Further, the piston can be manufactured by the one-piece casting without further additional processing of the ribs. The formation of the ribs is thus integrated into the casting process. Such a method is therefore particularly productive and therefore also suitable for the production of large quantities.

Erfindungsgemäß schließen sich die Stützrippen an Wände des Kolbenkörpers in der Nähe der Kolbenbohrung an, um eine Verstärkung durch Flansche und durch Stützrippen zu kombinieren.According to the invention, the support ribs connect to walls of the piston body in the vicinity of the piston bore in order to combine a reinforcement by flanges and support ribs.

Vorzugsweise besteht der Gusskolben aus Aluminium, um das Gewicht des Kolbens zu verringern. Aluminium weist die notwendige Hitzebeständigkeit, Leichtigkeit und Struktursteifigkeit auf.Preferably, the cast piston is made of aluminum to reduce the weight of the piston. Aluminum has the necessary heat resistance, lightness and structural rigidity.

Vorzugsweise sind die Stützrippen im Wesentlichen parallel zur Bolzenachse angeordnet. Die Bolzenachse ist durch zwei Bolzenbohrungen vorgegeben. Eine solche Anordnung verstärkt wirksam die stark beanspruchten Bereiche um die Bolzenbohrungen herum. Ferner stellt die parallele Anordnung der Stützrippen zur Bolzenachse die kürzeste Verbindung der zwei gegenüberliegenden Bolzenkörperseiten dar, wodurch Material gespart und daher das Gewicht des Kolbens optimiert werden kann.Preferably, the support ribs are arranged substantially parallel to the pin axis. The bolt axis is defined by two bolt holes. Such an arrangement effectively enhances the high stress areas around the pin holes. Furthermore, the parallel arrangement of the support ribs to the bolt axis represents the shortest connection of the two opposite bolt body sides, whereby material can be saved and therefore the weight of the piston can be optimized.

Vorzugsweise stehen die Stützrippen im Wesentlichen senkrecht auf Wänden des Kolbenschafts, um die Struktursteifigkeit des Kolbens zu optimieren.Preferably, the support ribs are substantially perpendicular to walls of the piston skirt to optimize the structural rigidity of the piston.

Vorzugsweise sind die Stützrippen flächig ausgebildet, wobei sich eine Kante einer solchen Rippe im Wesentlichen parallel zum Kolbenboden erstreckt und wenigstens eine sich an diese Kante anschließende Fläche im Wesentlichen senkrecht bezüglich des Kolbenbodens angeordnet ist, um die Struktursteifigkeit des Kolbens zu verbessern.Preferably, the support ribs are formed flat, wherein an edge of such a rib extends substantially parallel to the piston crown and at least one adjoining this edge surface is arranged substantially perpendicular to the piston crown to improve the structural rigidity of the piston.

Vorzugsweise sind genau zwei Stützrippen vorgesehen. Eine solche Verstärkung, auf der sich vorzugsweise spiegelsymmetrisch je eine Stützrippe auf beiden Seiten der Bolzenbohrungen befindet, verspricht eine wirkungsvolle Verbesserung der Struktursteifigkeit um die stark beanspruchten Bereiche der Bolzenbohrungen herum.Preferably, exactly two support ribs are provided. Such a reinforcement, on which there is preferably a mirror-symmetrical support rib on both sides of the bolt holes, promises an effective improvement of the structural rigidity around the heavily stressed areas of the bolt holes.

Vorzugsweise sind die Stützrippen nicht an den Kolbenboden angeformt. Ein Verbinden der Stützrippen mit dem Kolbenboden ist nicht notwendig, was zu Gunsten eines geringeren Materialverbrauchs ausgenutzt werden kann.Preferably, the support ribs are not formed on the piston head. Connecting the support ribs with the piston crown is not necessary, which can be exploited in favor of a lower material consumption.

Vorzugsweise verbindet jede Stützrippe zwei Seiten des Kolbenschafts. Um eine effektive Versteifung des Kolbens zu erreichen, ist eine durchgehende Verbindung zweier Seiten, vorzugsweise der Seiten, an denen sich die Bolzenbohrungen befinden, wirkungsvoll.Preferably, each support rib connects two sides of the piston skirt. In order to achieve effective stiffening of the piston, a continuous connection of two sides, preferably the sides where the bolt holes are located, effective.

Vorzugsweise befindet sich die Kante der Stützrippen, die dem Kolbenboden abgewandt ist, weiter vom Kolbenboden entfernt als die Mittelachse der Bolzenbohrungen, um insbesondere den Kolbenschaft zu versteifen. Insbesondere kann sich diese Kante auch weiter vom Kolbenboden entfernt befinden als die Bolzenbohrungen insgesamt, und die Aussparung kann sich vom Kolbenboden über die Mittelachse hinaus und bis in den Bereich des vom Kolbenboden abgewandten Endes der Bolzenbohrung erstrecken.Preferably, the edge of the support ribs facing away from the piston crown is farther from the piston crown than the central axis of the bolt bores, in particular to stiffen the piston skirt. In particular, this edge can also be further away from the piston crown than the bolt holes in total, and the recess can extend from the piston crown beyond the central axis and into the region of the end of the bolt bore facing away from the piston crown.

Die Aufgabe wird ferner durch ein Verfahren zur Herstellung des obigen Gusskolbens gelöst, bei dem die Aussparung, beispielsweise durch einen geeigneten Kern, beim Gießen der Stützrippen ausgebildet wird.The object is further achieved by a method for producing the above cast piston in which the recess is formed, for example by a suitable core, during the casting of the support ribs.

KURZE BESCHREIBUNG DER ZEICHNUNGBRIEF DESCRIPTION OF THE DRAWING

Fig. 1 ist eine perspektivische Ansicht eines erfindungsgemäßen Gusskolbens. Fig. 1 is a perspective view of a cast piston according to the invention.

BESCHREIBUNG EINER AUSFÜHRUNGSFORM DER ERFINDUNGDESCRIPTION OF AN EMBODIMENT OF THE INVENTION

Der erfindungsgemäße Gusskolben 1 in Fig. 1 weist einen Kolbenkopf 10 mit Kolbenboden 12 und einen Kolbenschaft 20 auf. Der Kolbenkopf 10 ist zylindrisch ausgebildet und ist mit Ringnuten 11 entlang seines äußeren Umfangs vorgesehen. An den Kolbenkopf 10 schließt sich in der Figur nach oben (aus der Papierebene heraus) der Kolbenschaft 20 an, der einen Hohlraum 25 aufweist. Der Kolbenschaft 20 muss, so wie im vorliegenden Fall, keine kreiszylindrische Form aufweisen. In der vorliegenden Ausführungsform umfasst der Kolbenschaft 20 vom Umfang zurückversetzte Wände, so dass sich der Kolbenschaft 20 einer Kastenform annähert. In dem Umfangsbereich des Kolbenschafts 20 sind zwei gegenüberliegende Bolzenbohrungen 26 zur Aufnahme eines Bolzens vorgesehen. Die Bolzenbohrungen sind mit Bolzenflanschen 27 verstärkt. Diese Bolzenbohrungen 26 können, wie es in der Figur nicht gezeigt ist, mit einem Sicherungsring ausgestattet sein, der in einer in der Bolzenbohrung 26 ausgebildeten Nut eingeformt ist. In den Bolzenbohrungen 26 lagert ein in der Figur nicht gezeigter Bolzen, der als Achse für das kleine Pleuelauge eines Pleuels (nicht gezeigt) dient. Der Hohlraum 25 des Kolbens 1 ist so ausgebildet, dass sich der Pleuel um eine Amplitude, die durch den Hub des Kolbens 1, den Pleuel und die Kurbelwelle vorgegeben ist, drehen kann.The inventive cast piston 1 in Fig. 1 has a piston head 10 with a piston head 12 and a piston stem 20. The piston head 10 is cylindrical and is provided with annular grooves 11 along its outer periphery. The piston head 10 is followed in the figure upwards (out of the plane of the paper) by the piston shaft 20, which has a cavity 25. The piston shaft 20 must, as in the present case, have no circular cylindrical shape. In the present embodiment, the piston stem comprises 20 recessed walls, so that the piston shaft 20 approaches a box shape. In the peripheral region of the piston shaft 20, two opposite pin holes 26 are provided for receiving a bolt. The bolt holes are reinforced with bolt flanges 27. These bolt holes 26 may, as it is not shown in the figure, be equipped with a locking ring which is formed in a groove formed in the pin bore 26. In the bolt holes 26, a bolt, not shown in the figure, which serves as an axis for the small connecting rod eye of a connecting rod (not shown) superimposed. The cavity 25 of the piston 1 is formed so that the connecting rod by an amplitude which is predetermined by the stroke of the piston 1, the connecting rod and the crankshaft, can rotate.

Parallel zur Bolzenachse, die durch die beiden Bolzenbohrungen 26 vorgegeben ist, erstrecken sich zwei Stützrippen 30. Die beiden Stützrippen sind symmetrisch auf beiden Seiten des nicht gezeigten Bolzens vorgesehen und verbinden die gegenüberliegenden abgeflachten Seiten des Kolbenschafts 20. Die Rippen 30 sind flächig ausgebildet und weisen obere Kanten 31 auf. Eine solche obere Kante 31 der Stützrippen kann, wie es in der vorliegenden Ausführungsform umgesetzt ist, oberhalb der Mittellinie der Bolzenachse angeordnet sein. Ferner ist die obere Kante 31 der Stützrippen 30 parallel zur Bolzenachse und parallel zum Kolbenboden 12 angeordnet. Es kann gießprozesstechnisch erforderlich sein, dass die Rippen 30 doppelt kegelförmig ausgebildet sind, die Parallelität also nur angedeutet wird und sich die Kante 31 insbesondere im Bereich ihrer Verbindung mit dem Kolbenschaft 20 nach außen wölbt. Die bis auf den Verbindungsbereich mit dem Kolbenschaft 20 im Wesentlichen flächig ausgestalteten Stützrippen 30 weisen Aussparungen 32 auf.Two support ribs 30 extend parallel to the pin axis, which is predetermined by the two pin holes 26. The two support ribs are provided symmetrically on both sides of the pin, not shown, and connect the opposite flattened sides of the piston skirt 20. The ribs 30 are flat and have upper edges 31. Such an upper edge 31 of the support ribs, as implemented in the present embodiment, may be disposed above the centerline of the bolt axis. Furthermore, the upper edge 31 of the support ribs 30 is arranged parallel to the pin axis and parallel to the piston head 12. It may be necessary by casting process, that the ribs 30 are formed double cone-shaped, the parallelism is thus only indicated and the edge 31 bulges in particular in the region of their connection to the piston shaft 20 to the outside. The support ribs 30, which are substantially flat except for the connection region with the piston skirt 20, have cutouts 32.

Je nach Einsatzgebiet des Kolbens müssen nicht notwendigerweise zwei parallele Stützrippen 30 vorgesehen sein. Beispielsweise kann eine Stützrippe vorgesehen sein, welche die beiden Flansche 27 verbindet. Um eine höhere Steifigkeit zu erreichen, kann es ferner erwünscht sein, zusätzlich zu den zwei parallelen Stützrippen weitere Stützrippen vorzusehen, beispielsweise eine Stützrippe, welche die beiden Flansche mittig und unterhalb der Bolzenbohrungen verbindet. Ferner können die Aussparungen hinsichtlich einer Gewichtsoptimierung und/oder einer Struktursteifigkeitsoptimierung kleiner oder größer ausgestaltet sein.Depending on the field of use of the piston, not necessarily two parallel support ribs 30 must be provided. For example, a support rib may be provided which connects the two flanges 27. Further, to achieve greater rigidity, it may be desirable to provide additional support ribs in addition to the two parallel support ribs, for example a support rib connecting the two flanges centrally and below the pin bores. Furthermore, the recesses can be made smaller or larger in terms of weight optimization and / or structural stiffness optimization.

Claims (10)

  1. Cast piston for an internal combustion engine having a piston crown (12), a cylindrical piston head (10) which adjoins the piston crown (12), and an at least partially hollow piston skirt (20) which is located on the side of the piston head (10) facing away from the piston crown (12) and has two pin bores which are suitable for receiving a pin, wherein
    the piston has one or more supporting ribs (30) which are at least partially located in the piston skirt (20), and wherein
    the supporting ribs (30) adjoin walls of the piston skirt (20) in the vicinity of the pin bores (26),
    characterised in that at least one supporting rib (30) has at least one recess (32) on the side facing towards the piston crown (12).
  2. Cast piston according to claim 1, characterised in that the piston is made of aluminium.
  3. Cast piston according to claim 1 or 2, characterised in that at least one supporting rib (30) runs essentially parallel to the pin axis which is predetermined by two pin bores (26).
  4. Cast piston according to any of the preceding claims, characterised in that at least one supporting rib (30) is substantially perpendicular to mutually opposed walls of the piston skirt (20).
  5. Cast piston according to any of the preceding claims, characterised in that the supporting ribs (30) are of planar construction, wherein one edge (31) of such a rib extends substantially parallel to the piston crown (12), and at least one surface adjoining this edge (31) is arranged substantially perpendicularly in relation to the piston crown (12).
  6. Cast piston according to any of the preceding claims, characterised in that exactly two supporting ribs (30) are provided.
  7. Cast piston according to any of the preceding claims, characterised in that the supporting ribs (30) are not formed integrally with the piston crown (12).
  8. Cast piston according to any of the preceding claims, characterised in that each supporting rib (30) connects two sides of the piston skirt (20).
  9. Cast piston according to any of the preceding claims, characterised in that the edge (31) of the supporting ribs which faces away from the piston crown (12) is further away from the piston crown (12) than the centre axis of the pin bores (26).
  10. Method for manufacturing a cast piston according to any of the preceding claims, characterised in that the recess (32) is formed when the supporting ribs (30) are cast.
EP08805008A 2007-12-06 2008-10-02 Cast piston having supporting ribs, and method for the production of such a piston Revoked EP2222947B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08805008T PL2222947T3 (en) 2007-12-06 2008-10-02 Cast piston having supporting ribs, and method for the production of such a piston

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007058789A DE102007058789A1 (en) 2007-12-06 2007-12-06 Casting piston with support ribs and method for producing such a piston
PCT/EP2008/063225 WO2009071354A1 (en) 2007-12-06 2008-10-02 Cast piston having supporting ribs, and method for the production of such a piston

Publications (2)

Publication Number Publication Date
EP2222947A1 EP2222947A1 (en) 2010-09-01
EP2222947B1 true EP2222947B1 (en) 2011-11-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08805008A Revoked EP2222947B1 (en) 2007-12-06 2008-10-02 Cast piston having supporting ribs, and method for the production of such a piston

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US (1) US8662049B2 (en)
EP (1) EP2222947B1 (en)
AT (1) ATE533934T1 (en)
DE (1) DE102007058789A1 (en)
ES (1) ES2377348T3 (en)
PL (1) PL2222947T3 (en)
WO (1) WO2009071354A1 (en)

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DE102011106559A1 (en) * 2011-07-05 2013-01-10 Mahle International Gmbh Piston for an internal combustion engine
DE102011085448A1 (en) * 2011-10-28 2013-05-02 Ks Kolbenschmidt Gmbh Piston and connecting rod for an internal combustion engine
US10184421B2 (en) * 2012-03-12 2019-01-22 Tenneco Inc. Engine piston
US9611936B2 (en) 2012-11-12 2017-04-04 Ge Oil & Gas Compression Systems, Llc Piston rod clamping system
US9163535B2 (en) 2012-11-12 2015-10-20 Ge Oil & Gas Compression Systems, Llc Crosshead lubrication system
US9611935B2 (en) * 2012-11-12 2017-04-04 Ge Oil & Gas Compression Systems, Llc Light composite piston
DE102013214738A1 (en) * 2013-07-29 2015-01-29 Federal-Mogul Nürnberg GmbH Lightweight construction of a diesel piston
WO2015070035A1 (en) * 2013-11-07 2015-05-14 Federal-Mogul Powertrain, Inc. Monolithic, galleryless piston and method of construction thereof
DE102016204830A1 (en) 2016-03-23 2017-09-28 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine
US10352270B2 (en) 2016-03-01 2019-07-16 Tenneco Inc. Galleryless piston with connection to pockets
WO2018192959A1 (en) * 2017-04-19 2018-10-25 Ks Kolbenschmidt Gmbh Piston with a structured design

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US2006008A (en) * 1923-06-05 1935-06-25 Bohn Aluminium & Brass Corp Piston
GB431743A (en) * 1933-08-31 1935-07-15 Max Spengler Improvements in pistons
FR782736A (en) 1934-12-14 1935-06-11 Improvements to pistons fitted with internal reinforcement fins
DE708137C (en) 1938-11-03 1941-07-12 Schmidt Gmbh Karl Light metal pistons for internal combustion engines
CH223131A (en) 1940-11-29 1942-08-31 Schmidt Gmbh Karl Light metal piston made by injection molding or die casting.
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Also Published As

Publication number Publication date
ATE533934T1 (en) 2011-12-15
ES2377348T3 (en) 2012-03-26
US8662049B2 (en) 2014-03-04
DE102007058789A1 (en) 2009-06-10
PL2222947T3 (en) 2012-03-30
US20100307446A1 (en) 2010-12-09
WO2009071354A1 (en) 2009-06-11
EP2222947A1 (en) 2010-09-01

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