EP1464821A1 - Piston for an internal combustion engine and method for producing the piston - Google Patents

Piston for an internal combustion engine and method for producing the piston Download PDF

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Publication number
EP1464821A1
EP1464821A1 EP04006224A EP04006224A EP1464821A1 EP 1464821 A1 EP1464821 A1 EP 1464821A1 EP 04006224 A EP04006224 A EP 04006224A EP 04006224 A EP04006224 A EP 04006224A EP 1464821 A1 EP1464821 A1 EP 1464821A1
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EP
European Patent Office
Prior art keywords
piston
coating
internal combustion
combustion engine
thickness
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.)
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EP04006224A
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German (de)
French (fr)
Inventor
Simon Dr. Reichstein
Lothar Hofmann
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Federal Mogul Nuernberg GmbH
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Federal Mogul Nuernberg GmbH
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Application filed by Federal Mogul Nuernberg GmbH filed Critical Federal Mogul Nuernberg GmbH
Publication of EP1464821A1 publication Critical patent/EP1464821A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/10—Pistons  having surface coverings
    • F02F3/12—Pistons  having surface coverings on piston heads
    • F02F3/14—Pistons  having surface coverings on piston heads within combustion chambers
    • 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 
    • F02F3/10—Pistons  having surface coverings
    • F02F3/12—Pistons  having surface coverings on piston heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres

Definitions

  • the invention relates to a piston for a Internal combustion engine and a method for its production.
  • thermomechanical Fatigue and especially the one caused by it Fatigue cracks due to a local increase in strength counteract.
  • particularly heat-resistant materials on the pistons, especially in its particularly stressed areas, applied are known in the prior art to be thermomechanical Fatigue and especially the one caused by it Fatigue cracks due to a local increase in strength counteract.
  • EP 0 393 922 B1 discloses one Aluminum pistons for internal combustion engines, in which a reinforced section in the area of the combustion chamber trough an aluminum alloy wire reinforced with ceramic fibers is formed. In other words, it becomes a composite provided, in which the extremely hard and strong fibers in an aluminum matrix can be embedded.
  • the Composite is extremely stiff and strong.
  • DE-A-1 122 325 discloses a light metal piston for Internal combustion engines with pure aluminum reinforcement.
  • DE 718 437 describes a piston with a Pure aluminum coating, which only a few Can be hundreds of a millimeter thick.
  • the invention has for its object to a piston create, especially with regard to the Resistance to thermomechanical fatigue is improved. Furthermore, a method for its Manufacturing will be suggested.
  • the piston according to the invention has at least in areas with a coating of ductile material a thickness of 200 ⁇ m or less.
  • This measure is in place insofar as diametrically opposed to the approaches pursued so far, as the first time a ductile, that is to say plastically deformable Material for coating the highly stressed areas of a Piston is used.
  • the invention is based on the Recognition that cracks in piston alloys microplastic processes due to different local Properties of the different phases of the material occur. These different properties contribute Heating and cooling processes to internal tensions. Further plastic deformation can occur. These events are on cracks appear on the surfaces. in the Within the scope of the invention it was also recognized that education these cracks due to a higher strength of the material, so also by coating with heat-resistant materials, only can be difficult to a small extent.
  • the coating applied according to the invention ductile material can, as more precisely below explained, applied firmly. Furthermore, this points Coating to a thickness of 200 microns or less. For one such thickness has been found to be the desired Properties are achievable. There is also a coating made of ductile material with the specified thickness economically producible. Is particularly preferred in in this connection, a thickness of 50 ⁇ m or less. To that Pistons according to the invention should also be mentioned that it in particular a highly loaded diesel piston can act. Basically, the one with the Coating provided according to the invention both from Steel as well as an aluminum alloy. Especially an aluminum cast alloy is preferred.
  • the edge of a combustion chamber trough is preferred. This is particularly extensive due to temperature changes affected and can be particularly effective through the coating according to the invention are protected.
  • a cast aluminum alloy became a highly loaded one Diesel pistons with a combustion chamber trough in the area of the Piston plate manufactured.
  • a particularly stressed edge area of the trough Coating made of ductile material with a thickness of up to 50 ⁇ m trained.
  • the coating consisted of technical pure aluminum and has been galvanically deposited.
  • the Ring groove was covered here. That way one could Pistons are manufactured for which confirmed by tests could be that resilience to thermomechanical fatigue was significantly improved.

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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 piston for an internal combustion engine has at least in areas a coating of ductile material with a thickness of 200 microns or less. The coating consists of a technically high-grade aluminum, and the coating may be applied galvanically. The piston has a combustion chamber bowl with its edge coated. An independent claim is included for a method for the manufacture of a piston for an internal combustion engine.

Description

Technisches GebietTechnical field

Die Erfindung betrifft einen Kolben für einen Verbrennungsmotor sowie ein Verfahren zu dessen Herstellung.The invention relates to a piston for a Internal combustion engine and a method for its production.

Kolben von Verbrennungsmotoren sind während des Betriebs fortlaufend Veränderungen der Betriebsbedingungen, insbesondere der Temperaturen, unterworfen. Sowohl Veränderungen im Hinblick auf den Lastfall, als auch Start- und Abschaltvorgänge führen zu erheblichen Veränderungen der Temperaturverteilung in dem Kolben. Hierdurch verändern sich auch die jeweiligen lokalen Temperaturen äußerst umfangreich und führen sowohl makroskopisch als auch mikroskopisch zu inneren Spannungen. Diese können zu plastischen Verformungen und im Extremfall zu einem Versagen des Kolbens führen. Insbesondere an Stellen, an denen der Kolben hohen Temperaturen ausgesetzt ist, muss eine besonders gute Beständigkeit des Kolbens gegen derartige thermomechanische Ermüdung gegeben sein.Internal combustion engine pistons are in operation continuous changes in operating conditions, especially subject to temperatures. Either Changes with regard to the load case, as well as start and Switch-off processes lead to considerable changes in the Temperature distribution in the flask. This will change the respective local temperatures are also extremely extensive and feed both macroscopically and microscopically internal tensions. These can lead to plastic deformations and in extreme cases lead to piston failure. Especially in places where the piston is high Exposed to temperatures must be a particularly good one Resistance of the piston to such thermomechanical Fatigue.

Stand der TechnikState of the art

Im Stand der Technik ist es bekannt, thermomechanische Ermüdung und insbesondere den dadurch hervorgerufenen Ermüdungsrissen durch eine lokale Erhöhung der Festigkeit entgegenzuwirken. Mit anderen Worten wurde bislang vorgeschlagen, besonders warmfeste Werkstoffe auf den Kolben, insbesondere in dessen besonders beanspruchten Bereichen, aufzubringen.It is known in the prior art to be thermomechanical Fatigue and especially the one caused by it Fatigue cracks due to a local increase in strength counteract. In other words, so far proposed particularly heat-resistant materials on the pistons, especially in its particularly stressed areas, applied.

Beispielsweise offenbart die EP 0 393 922 B1 einen Aluminiumkolben für Brennkraftmaschinen, bei dem ein verstärkter Abschnitt im Bereich der Brennraummulde durch einen mit Keramikfasern verstärkten Aluminiumlegierungsdraht gebildet wird. Mit anderen Worten wird ein Verbundwerkstoff vorgesehen, bei dem die extrem harten und festen Fasern in eine Aluminium-Matrix eingebettet werden. Der Verbundwerkstoff ist äußerst steif und fest.For example, EP 0 393 922 B1 discloses one Aluminum pistons for internal combustion engines, in which a reinforced section in the area of the combustion chamber trough an aluminum alloy wire reinforced with ceramic fibers is formed. In other words, it becomes a composite provided, in which the extremely hard and strong fibers in an aluminum matrix can be embedded. The Composite is extremely stiff and strong.

Dies gilt ebenso für die Beschichtung, die in der DE 29 21 952 A1 vorgeschlagen wird. Demzufolge sind verschiedene Arten von harten und verschleißarmen Schichten auf die besonders belasteten Bereiche aufzubringen.This also applies to the coating described in DE 29 21 952 A1 is proposed. As a result, they are different Types of hard and low wear layers on the to apply particularly stressed areas.

In der DE 198 13 430 A1 ist ein Verbundgusskolben mit einem Armierungsteil beschrieben, das mittels Hydro-Umformung hergestellt wird. Im Rahmen des Gießvorganges wird dieses vorgefertigte Armierungsteil mit dem eingegossenen Kolbenwerkstoff kombiniert.DE 198 13 430 A1 describes a composite casting piston with a Reinforcement part described that by means of hydroforming will be produced. As part of the casting process, this is prefabricated reinforcement part with the cast-in Piston material combined.

Die DE-A-1 122 325 offenbart einen Leichtmetallkolben für Verbrennungsmotoren mit einer Bewehrung aus Reinaluminium.DE-A-1 122 325 discloses a light metal piston for Internal combustion engines with pure aluminum reinforcement.

Schließlich geht aus der DE 718 437 ein Kolben mit einem Überzug aus Reinaluminium hervor, der lediglich wenige Hunderstelmillimeter dick sein kann.Finally, DE 718 437 describes a piston with a Pure aluminum coating, which only a few Can be hundreds of a millimeter thick.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, einen Kolben zu schaffen, der insbesondere im Hinblick auf die Widerstandsfähigkeit gegen thermomechanische Ermüdung verbessert ist. Ferner soll ein Verfahren zu dessen Herstellung vorgeschlagen werden. The invention has for its object to a piston create, especially with regard to the Resistance to thermomechanical fatigue is improved. Furthermore, a method for its Manufacturing will be suggested.

Die Lösung dieser Aufgabe erfolgt zum einen durch den im Anspruch 1 beschriebenen Kolben.This task is solved on the one hand by the im Piston described claim 1.

Demzufolge weist der erfindungsgemäße Kolben zumindest bereichsweise eine Beschichtung aus duktilem Material mit einer Dicke von 200 µm oder weniger auf. Diese Maßnahme steht insofern diametral den bisher verfolgten Ansätzen gegenüber, als erstmalig ein duktiles, also gut plastisch verformbares Material zur Beschichtung der hochbelasteten Bereiche eines Kolbens eingesetzt wird. Die Erfindung beruht auf der Erkenntnis, dass Risse in Kolbenlegierungen durch mikroplastische Vorgänge aufgrund unterschiedlicher lokaler Eigenschaften der verschiedenen Phasen des Werkstoffs auftreten. Diese unterschiedlichen Eigenschaften führen bei Aufheiz- und Abkühlvorgängen zu inneren Spannungen. Ferner kann plastische Verformung auftreten. Diese Vorgänge haben an den Oberflächen die Entstehung von Rissen zur Folge. Im Rahmen der Erfindung wurde ferner erkannt, dass die Bildung dieser Risse durch eine höhere Festigkeit des Materials, also auch durch die Beschichtung mit warmfesten Materialien, nur in geringem Umfang erschwert werden kann.Accordingly, the piston according to the invention has at least in areas with a coating of ductile material a thickness of 200 µm or less. This measure is in place insofar as diametrically opposed to the approaches pursued so far, as the first time a ductile, that is to say plastically deformable Material for coating the highly stressed areas of a Piston is used. The invention is based on the Recognition that cracks in piston alloys microplastic processes due to different local Properties of the different phases of the material occur. These different properties contribute Heating and cooling processes to internal tensions. Further plastic deformation can occur. These events are on cracks appear on the surfaces. in the Within the scope of the invention it was also recognized that education these cracks due to a higher strength of the material, so also by coating with heat-resistant materials, only can be difficult to a small extent.

Demgegenüber wurde im Rahmen der Erfindung herausgefunden, dass es die Eigenschaften des Kolbens erheblich verbessert, wenn die Duktilität des Materials erhöht wird. Hierunter wird die Fähigkeit des Materials zu plastischer Verformung ohne Rissbildung verstanden. Im Gegensatz zu den bisher verwendeten harten Schichten wird im Rahmen der Erfindung folglich die Verwendung weicher, duktiler Schichten vorgeschlagen. Diese Schichten sind geeignet, an den inneren Spannungen des Kolbenwerkstoffs und an der unter Umständen auftretenden Plastizität "teilzunehmen", ohne dass die Gefahr einer Rissbildung besteht. Hierdurch kann, wie Versuche zeigen, der Widerstand des Kolbens gegen thermische Ermüdung erheblich verbessert werden, und die Wahrscheinlichkeit von Rissbildung umfangreich verringert werden. In contrast, it was found within the scope of the invention that it significantly improves the properties of the piston when the ductility of the material is increased. This will be the ability of the material to undergo plastic deformation without Understood cracking. In contrast to the previous ones hard layers used is within the scope of the invention consequently the use of soft, ductile layers proposed. These layers are suitable on the inner Stresses of the piston material and on the under certain circumstances occurring plasticity "participate" without the danger there is cracking. This can, like attempts show the resistance of the piston to thermal fatigue be significantly improved, and the likelihood of Crack formation can be significantly reduced.

Die gemäß der Erfindung aufgebrachte Beschichtung aus duktilem Material kann, wie nachfolgend noch genauer erläutert, festhaftend aufgebracht werden. Ferner weist diese Beschichtung eine Dicke von 200 µm oder weniger auf. Für eine derartige Dicke hat sich herausgestellt, dass die gewünschten Eigenschaften erreichbar sind. Ferner ist eine Beschichtung aus duktilem Material mit der angegebenen Dicke wirtschaftlich herstellbar. Besonders bevorzugt wird in diesem Zusammenhang eine Dicke von 50 µm oder weniger. Zu dem erfindungsgemäßen Kolben sei noch erwähnt, dass es sich hierbei insbesondere um einen hochbelasteten Dieselkolben handeln kann. Grundsätzlich kann der mit der erfindungsgemäßen Beschichtung versehene Kolben sowohl aus Stahl als auch aus einer Aluminiumlegierung sein. Besonders bevorzugt wird eine Aluminium-Guss-Legierung.The coating applied according to the invention ductile material can, as more precisely below explained, applied firmly. Furthermore, this points Coating to a thickness of 200 microns or less. For one such thickness has been found to be the desired Properties are achievable. There is also a coating made of ductile material with the specified thickness economically producible. Is particularly preferred in in this connection, a thickness of 50 µm or less. To that Pistons according to the invention should also be mentioned that it in particular a highly loaded diesel piston can act. Basically, the one with the Coating provided according to the invention both from Steel as well as an aluminum alloy. Especially an aluminum cast alloy is preferred.

Bevorzugte Weiterbildungen eines erfindungsgemäßen Kolbens sind in den weiteren Ansprüchen beschrieben.Preferred developments of a piston according to the invention are described in the further claims.

Bei Versuchen hat sich herausgestellt, dass eine Beschichtung aus technisch reinem Aluminium zu besonders günstigen Eigenschaften des damit beschichteten Kolbens führt. Technisch reines Aluminium eignet sich deshalb besonders gut als das Beschichtungsmaterial, weil es zum einen duktiler als der Kolbenwerkstoff, beispielsweise eine Aluminiumlegierung oder Stahl, ist, und somit das oben beschriebene Prinzip der Erfindung realisiert. Im übrigen weist es jedoch ähnliche mechanische und physikalische Eigenschaften wie der Kolbenwerkstoff auf, was für den damit beschichteten Kolben zu besonders vorteilhaften Eigenschaften führt.Experiments have shown that a coating Made of technically pure aluminum at particularly affordable prices Properties of the piston coated with it leads. Technically pure aluminum is therefore particularly suitable than the coating material because on the one hand it is more ductile than the piston material, for example an aluminum alloy or steel, and thus the principle of Invention realized. For the rest, however, it shows similar mechanical and physical properties like that Piston material on what for the piston coated with it leads to particularly advantageous properties.

Als bevorzugtes Herstellungsverfahren hat sich ein galvanisches Abscheiden herausgestellt. Dieses Verfahren führt in vorteilhafter Weise zu sehr gleichmäßigen und gut haftenden Schichten mit der oben angegebenen Dicke. A has become the preferred manufacturing method electrodeposition highlighted. This method advantageously leads to very even and good adhesive layers with the thickness specified above.

Im Hinblick auf die Bereiche des Kolbens, die mit der erfindungsgemäßen Beschichtung versehen sind, wird insbesondere der Rand einer Brennraummulde bevorzugt. Dieser ist besonders umfangreich durch Temperaturveränderungen betroffen und kann besonders wirksam durch die erfindungsgemäße Beschichtung geschützt werden.With regard to the areas of the piston that correspond to the coating according to the invention are provided especially the edge of a combustion chamber trough is preferred. This is particularly extensive due to temperature changes affected and can be particularly effective through the coating according to the invention are protected.

Die Lösung der oben angegebenen Aufgabe erfolgt zum anderen durch das im Anspruch 5 beschriebene Verfahren zur Herstellung eines Kolbens, bei dem ein Kolben mit duktilem Material mit einer Dicke von 200 µm oder weniger beschichtet wird. Hierdurch ist ein Kolben mit den vorangehend beschriebenen, im Hinblick auf die Temperaturbeständigkeit günstigen Eigenschaften, herstellbar. Ferner kann das Verfahren wirtschaftlich realisiert werden.On the other hand, the above-mentioned problem is solved by the method described in claim 5 Manufacture of a piston in which a piston with ductile Material coated with a thickness of 200 microns or less becomes. This is a piston with the previous one described, in terms of temperature resistance favorable properties, producible. Furthermore, that Processes can be realized economically.

Bevorzugte Verfahrensschritte bestehen entsprechend den oben angegebenen Ausführungsformen des erfindungsgemäßen Kolbens darin, die Beschichtung aus technisch reinem Aluminium auszubilden, und/oder diese galvanisch abzuscheiden und/oder den Rand einer Brennraummulde zu beschichten. Im Zusammenhang mit dem erfindungsgemäßen Verfahren sei ferner erwähnt, dass in vorteilhafter Weise Bereiche, in denen die Beschichtung nicht erwünscht ist, durch einfache Maskentechniken abgedeckt werden können. Hierbei handelt es sich beispielsweise um die Ringnuten eines Kolbens.Preferred process steps exist in accordance with the above specified embodiments of the piston according to the invention in it, the coating of technically pure aluminum train, and / or galvanically deposit them and / or to coat the edge of a combustion chamber trough. In connection with the method according to the invention it should also be mentioned that advantageously areas where the coating is not desired, covered by simple masking techniques can be. This is for example the Ring grooves of a piston.

Ausführungsbeispielembodiment

Aus einer Aluminium-Guss-Legierung wurde ein hochbelasteter Dieselkolben mit einer Brennraummulde im Bereich des Kolbenbodens hergestellt. In dem besonders kritischen, besonders beanspruchten Randbereich der Mulde wurde eine Beschichtung aus duktilem Material mit einer Dicke von bis zu 50 µm ausgebildet. Die Beschichtung bestand aus technisch reinem Aluminium und wurde galvanisch abgeschieden. Die Ringnut wurde hierbei abgedeckt. Auf diese Weise konnte ein Kolben hergestellt werden, für den durch Versuche bestätigt werden konnte, dass die Widerstandsfähigkeit gegen thermomechanische Ermüdung erheblich verbessert war.A cast aluminum alloy became a highly loaded one Diesel pistons with a combustion chamber trough in the area of the Piston plate manufactured. In the particularly critical, a particularly stressed edge area of the trough Coating made of ductile material with a thickness of up to 50 µm trained. The coating consisted of technical pure aluminum and has been galvanically deposited. The Ring groove was covered here. That way one could Pistons are manufactured for which confirmed by tests could be that resilience to thermomechanical fatigue was significantly improved.

Claims (9)

Kolben für einen Verbrennungsmotor, der zumindest bereichsweise eine Beschichtung aus duktilem Material mit einer Dicke von 200 µm oder weniger aufweist.Piston for an internal combustion engine, at least in some areas a coating of ductile material having a thickness of 200 µm or less. Kolben nach Anspruch 1, dadurch gekennzeichnet, dass die Beschichtung aus technisch reinem Aluminium besteht.Piston according to claim 1, characterized in that the coating consists of technically pure aluminum. Kolben nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Beschichtung galvanisch abgeschieden wird.Piston according to claim 1 or 2, characterized in that the coating is electrodeposited. Kolben nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Kolben eine Brennraummulde aufweist, deren Rand beschichtet ist.Piston according to one of the preceding claims, characterized in that the piston has a combustion chamber trough, the edge of which is coated. Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor, bei dem der Kolben mit einem duktilen Material mit einer Dicke von 200 µm oder weniger beschichtet wird.Method of making a piston for one Internal combustion engine in which the piston with a ductile Material with a thickness of 200 µm or less is coated. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass der Kolben durch technisch reines Aluminium beschichtet wird.A method according to claim 5, characterized in that the piston is coated by technically pure aluminum. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Beschichtung durch galvanisches Abscheiden ausgebildet wird.A method according to claim 5 or 6, characterized in that the coating is formed by electrodeposition. Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass der Rand einer Brennraummulde beschichtet wird. Method according to one of claims 5 to 7, characterized in that the edge of a combustion chamber trough is coated. Verfahren nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, dass der Kolben beim Beschichten teilweise, insbesondere durch Maskentechniken, abgedeckt wird.Method according to one of claims 5 to 8, characterized in that the piston is partially covered during coating, in particular by masking techniques.
EP04006224A 2003-04-03 2004-03-16 Piston for an internal combustion engine and method for producing the piston Withdrawn EP1464821A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003115232 DE10315232A1 (en) 2003-04-03 2003-04-03 Pistons for an internal combustion engine and method for producing a piston
DE10315232 2003-04-03

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WO2005046925A1 (en) * 2003-11-15 2005-05-26 Daimlerchrysler Ag Internal combustion engine component and method for the production thereof
US20130025561A1 (en) * 2011-07-28 2013-01-31 Dieter Gabriel Bowl rim and root protection for aluminum pistons

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CN102177266A (en) * 2008-09-05 2011-09-07 Ks科尔本施密特有限公司 Method for manufacturing a piston of an internal combustion engine, comprising an improved aluminum silicon alloy
WO2014198896A1 (en) * 2013-06-14 2014-12-18 Ks Kolbenschmidt Gmbh Method for producing an oxidation protection layer for a piston for use in internal combustion engines and piston having an oxidation protection layer

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DE1122325B (en) * 1958-12-02 1962-01-18 Mahle Kg Light metal pistons for internal combustion engines with a combustion chamber provided in the piston crown
US3199929A (en) * 1960-12-05 1965-08-10 Reynolds Metals Co Sliding surface protection
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO2005046925A1 (en) * 2003-11-15 2005-05-26 Daimlerchrysler Ag Internal combustion engine component and method for the production thereof
US7770291B2 (en) 2003-11-15 2010-08-10 Daimler Ag Internal combustion engine component and method for the production thereof
US20130025561A1 (en) * 2011-07-28 2013-01-31 Dieter Gabriel Bowl rim and root protection for aluminum pistons

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