EP1926902B1 - Piston, especially cooling channel piston, comprising three friction-welded zones - Google Patents

Piston, especially cooling channel piston, comprising three friction-welded zones Download PDF

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Publication number
EP1926902B1
EP1926902B1 EP05784012A EP05784012A EP1926902B1 EP 1926902 B1 EP1926902 B1 EP 1926902B1 EP 05784012 A EP05784012 A EP 05784012A EP 05784012 A EP05784012 A EP 05784012A EP 1926902 B1 EP1926902 B1 EP 1926902B1
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EP
European Patent Office
Prior art keywords
joining
piston
cooling
webs
duct
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EP05784012A
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German (de)
French (fr)
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EP1926902A1 (en
Inventor
Volker Gniesmer
Gerhard Luz
Emmerich Ottliczky
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KS Kolbenschmidt GmbH
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KS Kolbenschmidt 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid

Definitions

  • the invention relates to a cooling channel piston of an internal combustion engine according to the features of the preamble of patent claim 1.
  • a cooling channel piston of an internal combustion engine which consists of exactly two parts. These parts are an upper part, which here has a radially encircling ring field and a combustion bowl. As a further part, a lower part is provided, which receives the piston skirt and the pin bore. At the lower edge of the ring field and at the deepest vertex of the combustion chamber trough radially two circumferential joining webs are present on the upper part, which correspond in position and extension with two joint webs of the lower part. These two separately producible parts are inseparably connected to each other by means of a joining process, which is a friction welding process. Thereafter, a one-piece cooling channel piston is available, which can be installed in the internal combustion engine, optionally after it has been finished.
  • the Patent Abstracts of Japan JP 52 031213 A show a cooling channel piston, wherein a cooling channel is arranged radially behind a ring field of a piston and is located completely in the lower part of the piston.
  • a flat-forming upper part is arranged on the upper side of the cooling channel piston, which together with the correspondingly shaped lower part of the cooling channel piston forms a further multiplicity of small cooling channels, which are concentrically nested in one another and connected to one another.
  • cooling channel piston of an internal combustion engine having an upper part and a lower part known, wherein the upper part together with the lower part forms at least one radially behind a ring field arranged cooling channel.
  • this cooling channel piston upper part and lower part are only connected to each other via two radially encircling and corresponding joining webs.
  • the invention is therefore the object of developing a genericdekanalkolben such that it has improved properties in terms of its strength and long-term stability.
  • a cooling channel piston of an internal combustion engine is provided with an upper part and a lower part which can be produced separately and joined together in a friction welding process, wherein the upper part together with the lower part forms at least one cooling channel arranged radially behind a ring field and wherein furthermore the upper part is at least three radially surrounding joining webs and the lower part also has at least three radially surrounding joining webs which are brought together during a joining operation and over which the upper part is firmly connected to the lower part.
  • two joining webs of the upper part and the lower part are arranged coaxially within four joining webs, so that the upper part with the lower part not only two joining areas, as it was previously known, but three (or possibly even more) joining areas are connected.
  • top and bottom can be made in the same or different processes (such as forging, casting, pressing, extrusion, and the like) and made of the same or different materials.
  • the upper part may be made of a more heat-resistant material than the lower part.
  • Weight aspects also play a role here.
  • the upper part made of a lightweight material (such as aluminum), while the lower part of a ferrous material (for example, gray cast iron) consists.
  • the invention provides that the upper part and the lower part are designed such that they form a further cooling channel with the further joining webs.
  • the cooling channel piston not only has a cooling channel lying almost directly behind the annular field, but also at least one further cooling channel within which a cooling medium (in particular engine oil) can circulate, around the piston head (in particular the region below the combustion chamber recess) ) to be able to cool.
  • a cooling medium in particular engine oil
  • three cooling areas can be created, which is an outer and a middle cooling channel and the third area is below the apex of the combustion bowl.
  • the joining webs in three different joint areas have approximately the same cross-section. This will be within the piston crown achieved a nearly equal structural strength.
  • the almost same cross-section also has an advantageous effect on the joining process, since always the same amounts of energy applied and not consuming coordinated with each other.
  • FIG. 1 shows a cooling channel piston having an upper part 2 and a lower part 3.
  • the upper part 2 has in known manner a combustion bowl 4 and a radially encircling ring field 5 with unspecified annular grooves.
  • the lower part 3 is added, which in turn has a pin bore 6 and a piston skirt 7.
  • the upper part 2 is in particular connected to the lower part 3 with a friction welding process in three joining regions 8 to 10.
  • a joining web 11 of the upper part 2 and a joining web 12 of the lower part 3 are opposite.
  • a joining web 13 of the upper part 2 and a joining web 14 of the lower part 3 are opposite.
  • a joining web 15 of the upper part 2 and a joining web 16 of the lower part 3 are arranged.
  • the first joining area 11 is in a first joining plane 17 and the second joining regions 9, 10 are both arranged in a second joining plane 18.
  • the upper part 2 and the lower part 13 are designed so that they form a lying behind the ring field 5 cooling channel 19 with their radially surrounding joining webs 11.
  • the two further joining areas 9, 10 create a cavity between them which leads to a better distribution of forces and to a reduction in weight in the piston crown.
  • FIG. 2 shows the cooling channel piston 1, which also has three joining areas 8 to 10 with associated joining webs 11 to 16.
  • the first joining region 8 is located approximately below the annular field 5, while the second joining region 9 is present approximately at the lowest vertex of the combustion chamber trough 4.
  • the third joining region 10 is arranged with its mutually opposite joining webs 15, 16 on the axis of movement of the stroke of the cooling channel piston 1 during its operation. This in turn leads to the already in FIG. 1 described cooling channel 19, while here, due to the design of the upper part 2 and the lower part 3 with the joining webs 13 to 16 coaxially behind the cooling channel 19 lying further cooling channel 21 is created.
  • the openings for the supply and the flow of the circulating in the cooling channel 19, 21 cooling medium are present, but omitted here for the sake of clarity (as well as in the other figures).
  • the joining webs 11 to 17 have different cross-sections and lie in different joining planes 17, 18, 20.
  • FIG. 3 shows the cooling channel piston 1, in which also three joining regions 8 to 10 are present, wherein the joining webs 11 to 16 have almost the same cross-section, but in three different joining planes 17, 18, 20 are arranged. Again, two cooling channels 19, 21 are available again.
  • FIG. 4 shows the cooling channel piston 1 with three joining areas 8 to 10 and the associated joining webs 11 to 16, wherein the joining webs have almost the same cross-section, but (stepped) in three mutually different joining plane 17, 18, 20 are arranged. Due to the design of the lower part 2 not only two cooling channels 19, 21 are formed, but it is in the inner region 22 (which extends below the upper vertex of the combustion bowl 4) realized another closed space, which can also act as a cooling area.

Abstract

A piston, especially a cooling channel piston of an internal combustion engine, has an upper part and a lower part which can be produced separately from each other and subsequently be assembled. The upper part has at least three radially peripheral joining webs and the lower part likewise at least three radially peripheral joining webs. During assembly, the webs are put together and connect the upper part firmly to the lower part.

Description

Die Erfindung betrifft einen Kühlkanalkolben einer Brennkraftmaschine gemäß den Merkmalen des Oberbegriffes des Patentanspruchs 1.The invention relates to a cooling channel piston of an internal combustion engine according to the features of the preamble of patent claim 1.

Aus der US 6,155,157 ist ein Kühlkanalkolben einer Brennkraftmaschine bekannt, der aus genau zwei Teilen besteht. Bei diesen Teilen handelt es sich um ein Oberteil, welches hier ein radial umlaufendes Ringfeld und eine Brennraummulde aufweist. Als weiteres Teil ist ein Unterteil vorgesehen, welches den Kolbenschaft sowie die Bolzenbohrung aufnimmt. An der Unterkante des Ringfeldes und an dem tiefsten Scheitelpunkt der Brennraummulde sind radial zwei umlaufende Fügestege an dem Oberteil vorhanden, die in Lage und Erstreckung mit zwei Fügestegen des Unterteiles korrespondieren. Diese beiden separat voneinander herstellbaren Teile werden mittels eines Fügevorganges, bei dem es sich hier um einen Reibschweißvorgang handelt, untrennbar miteinander verbunden. Danach steht ein einteiliger Kühlkanalkolben zur Verfügung, der in die Brennkraftmaschine eingebaut werden kann, gegebenenfalls nachdem er feinbearbeitet worden ist.From the US 6,155,157 is a cooling channel piston of an internal combustion engine is known, which consists of exactly two parts. These parts are an upper part, which here has a radially encircling ring field and a combustion bowl. As a further part, a lower part is provided, which receives the piston skirt and the pin bore. At the lower edge of the ring field and at the deepest vertex of the combustion chamber trough radially two circumferential joining webs are present on the upper part, which correspond in position and extension with two joint webs of the lower part. These two separately producible parts are inseparably connected to each other by means of a joining process, which is a friction welding process. Thereafter, a one-piece cooling channel piston is available, which can be installed in the internal combustion engine, optionally after it has been finished.

Bei diesem aus der US 6,155,157 bekannten Kühlkanalkolben sind sowohl das Oberteil als auch das Unterteil derart gestaltet, dass sie zusammen mit den einander. korrespondieren Fügestellen nach dem Fügevorgang einen hinter dem Ringfeld liegenden Kühlkanal zur Zirkulation von Kühlmedium bilden. Zu diesem Zweck ist es erforderlich, die innen liegende Fügestelle recht nah an die außen liegende Fügestelle, die sich im Bereich des Ringfeldes befindet, zu legen, damit dadurch der Kühlkanal im Kolbenboden gebildet werden kann. Dies hat allerdings den Nachteil, dass die Abstützung des Kolbenbodens nicht mehr optimal gewährleistet werden kann, insbesondere im Hinblick auf die bei modernen Brennkraftmaschinen vorkommenden Einspritz- und Zünddrücke.In this from the US 6,155,157 Known cooling channel piston both the upper part and the lower part are designed such that they together with each other. Corresponding joints after the joining process form a lying behind the ring field cooling channel for the circulation of cooling medium. For this purpose, it is necessary to place the inner joint quite close to the outer joint, which is located in the region of the ring field, so that thereby the cooling channel can be formed in the piston crown. However, this has the disadvantage that the support of the piston crown can no longer be optimally guaranteed, in particular with regard to the injection and ignition pressures occurring in modern internal combustion engines.

Die Patent Abstracts of Japan JP 52 031213 A zeigen einen Kühlkanalkolben, wobei ein Kühlkanal radial hinter einem Ringfeld eines Kolbens angeordnet ist und sich vollständig in dem Unterteil des Kolbens befindet. Zusätzlich ist an der Oberseite des Kühlkanalkolbens ein flachbauendes Oberteil angeordnet, welches zusammen mit dem entsprechend gestalteten Unterteil des Kühlkanalkolbens eine weitere Vielzahl von kleinen Kühlkanälen, die konzentrisch ineinander verschachtelt und miteinander verbunden sind, bildet.The Patent Abstracts of Japan JP 52 031213 A show a cooling channel piston, wherein a cooling channel is arranged radially behind a ring field of a piston and is located completely in the lower part of the piston. In addition, a flat-forming upper part is arranged on the upper side of the cooling channel piston, which together with the correspondingly shaped lower part of the cooling channel piston forms a further multiplicity of small cooling channels, which are concentrically nested in one another and connected to one another.

Aus der US 2001/0029840 A1 ist ebenfalls ein Kühlkanalkolben einer Brennkraftmaschine mit einem Oberteil sowie einem Unterteil bekannt, wobei das Oberteil zusammen mit dem Unterteil zumindest einen radial hinter einem Ringfeld angeordneten Kühlkanal bildet. Bei diesem Kühlkanalkolben werden Oberteil und Unterteil jedoch nur über zwei radial umlaufende und korrespondierende Fügestege miteinander verbunden.From the US 2001/0029840 A1 is also a cooling channel piston of an internal combustion engine having an upper part and a lower part known, wherein the upper part together with the lower part forms at least one radially behind a ring field arranged cooling channel. In this cooling channel piston upper part and lower part, however, are only connected to each other via two radially encircling and corresponding joining webs.

Der Erfindung liegt daher die Aufgabe zugrunde, einen gattungsgemäßen Kühlkanalkolben derart weiterzubilden, dass er hinsichtlich seiner Festigkeit und Langzeitstabilität verbesserte Eigenschaften aufweist.The invention is therefore the object of developing a generic Kühlkanalkolben such that it has improved properties in terms of its strength and long-term stability.

Diese Aufgabe ist durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Erfindungsgemäß ist ein Kühlkanalkolben einer Brennkraftmaschine mit einem Oberteil sowie einem Unterteil, die separat voneinander herstellbar und anschließend in einem Reibschweissvorgang zusammenfügbar sind, vorgesehen, wobei das Oberteil zusammen mit dem Unterteil zumindest einen radial hinter einem Ringfeld angeordneten Kühlkanal bildet und wobei weiterhin das Oberteil zumindest drei radial umlaufende Fügestege und das Unterteil ebenfalls zumindest drei radial umlaufende Fügestege aufweist, die während eines Fügevorganges zusammengebracht werden und über die das Oberteil fest mit dem Unterteil verbunden wird. Damit sind zwei Fügestege jeweils des Oberteiles und des Unterteiles koaxial innerhalb von vier Fügestegen angeordnet, so dass das Oberteil mit dem Unterteil nicht nur über zwei Fügebereiche, wie es bisher bekannt war, sondern über drei (oder gegebenenfalls noch mehr) Fügebereiche miteinander verbunden werden. Daraus ergibt sich eine höhere Festigkeit des gesamten Kolbenbodens, so dass die auftretenden Zünd- und Verbrennungsdrücke wesentlich besser aufgefangen werden können. Dadurch erhöht sich auch die Langzeitstabilität über die Lebensdauer des Kolbens während seines Betriebes in der Brennkraftmaschine. Durch die weiteren Fügestege wird zudem die Abstützung der Brennraummulde verbessert, insbesondere versteift, so dass die Materialdicke im Bereich der Brennraummulde reduziert werden kann, was zu einer Gewichtsersparnis führt. Bei dem Fügevorgang handelt es sich in besonders vorteilhafter Weise um ein Reibschweißverfahren, da dieses es gestattet, alle drei Fügebereiche gleichzeitig zu bearbeiten und damit das Oberteil unlösbar mit dem Unterteil zu verbinden. Die Verwendung von nur zwei Teilen (Oberteil und Unterteil) zur Herstellung des Kühlkanalkolbens führt noch zu einer Reduzierung der Teilevielfalt, die gerade bei der Serienherstellung von Kolben von Bedeutung ist. Außerdem kommt noch in Betracht, dass das Oberteil und das Unterteil in gleichen oder verschiedenen Verfahren (wie zum Beispiel Schmieden, Gießen, Pressen, Fließpressen und dergleichen) hergestellt werden kann und aus gleichen oder verschiedenen Materialien besteht. So kann beispielsweise das Oberteil aus einem hitzebeständigeren Material bestehen wie das Unterteil. Auch Gewichtsaspekte spielen hier eine Rolle. So kann beispielsweise das Oberteil aus einem Leichtbauwerkstoff (wie Aluminium) bestehen, während das Unterteil aus einem Eisenwerkstoff (zum Beispiel Grauguß) besteht.According to the invention, a cooling channel piston of an internal combustion engine is provided with an upper part and a lower part which can be produced separately and joined together in a friction welding process, wherein the upper part together with the lower part forms at least one cooling channel arranged radially behind a ring field and wherein furthermore the upper part is at least three radially surrounding joining webs and the lower part also has at least three radially surrounding joining webs which are brought together during a joining operation and over which the upper part is firmly connected to the lower part. Thus, two joining webs of the upper part and the lower part are arranged coaxially within four joining webs, so that the upper part with the lower part not only two joining areas, as it was previously known, but three (or possibly even more) joining areas are connected. This results in a higher strength of the entire piston crown, so that the ignition and Combustion pressures can be much better absorbed. This also increases the long-term stability over the life of the piston during its operation in the internal combustion engine. Due to the further joining webs, the support of the combustion bowl is also improved, in particular stiffened, so that the material thickness in the region of the combustion bowl can be reduced, which leads to a weight saving. In the joining process is in a particularly advantageous manner to a friction welding process, since this allows to work all three joining areas simultaneously and thus to connect the upper part inextricably with the lower part. The use of only two parts (upper part and lower part) for the production of the cooling channel piston still leads to a reduction in the variety of parts, which is especially important in the series production of pistons. It is also contemplated that the top and bottom can be made in the same or different processes (such as forging, casting, pressing, extrusion, and the like) and made of the same or different materials. For example, the upper part may be made of a more heat-resistant material than the lower part. Weight aspects also play a role here. Thus, for example, the upper part made of a lightweight material (such as aluminum), while the lower part of a ferrous material (for example, gray cast iron) consists.

Weiterhin ist erfindungsgemäß vorgesehen, dass das Oberteil und das Unterteil derart gestaltet sind, dass sie mit den weiteren Fügestegen einen weiteren Kühlkanal bildern. Damit weist der Kühlkanalkolben nicht nur einen nahezu direkt hinter dem Ringfeld liegenden Kühlkanal auf, sondern innerhalb dessen koaxial liegend noch zumindest einen weiteren Kühlkanal auf, in dem ebenfalls ein Kühlmedium (insbesondere Motoröl) zirkulieren kann, um den Kolbenboden (insbesondere den Bereich unterhalb der Brennraummulde) kühlen zu können. Je nach Gestaltung des Oberteiles, des Unterteiles und deren Fügestege können zum Beispiel drei Kühlbereiche geschaffen werden, bei denen es sich um einen äußeren und einen mittleren Kühlkanal handelt und der dritte Bereich sich unterhalb des Scheitelpunktes der Brennraummulde befindet.Furthermore, the invention provides that the upper part and the lower part are designed such that they form a further cooling channel with the further joining webs. Thus, the cooling channel piston not only has a cooling channel lying almost directly behind the annular field, but also at least one further cooling channel within which a cooling medium (in particular engine oil) can circulate, around the piston head (in particular the region below the combustion chamber recess) ) to be able to cool. Depending on the design of the upper part, the lower part and their joints, for example, three cooling areas can be created, which is an outer and a middle cooling channel and the third area is below the apex of the combustion bowl.

In Weiterbildung der Erfindung weisen die Fügestege in drei verschiedenen Fügebereichen in etwa einen gleichen Querschnitt auf. Dadurch wird innerhalb des Kolbenbodens eine nahezu gleiche Strukturfestigkeit erzielt. Der nahezu gleiche Querschnitt wirkt sich auch vorteilhaft auf den Fügevorgang aus, da immer die gleichen Energiemengen aufgebracht und nicht aufwändig aufeinander abgestimmt werden müssen.In a development of the invention, the joining webs in three different joint areas have approximately the same cross-section. This will be within the piston crown achieved a nearly equal structural strength. The almost same cross-section also has an advantageous effect on the joining process, since always the same amounts of energy applied and not consuming coordinated with each other.

Ausführungsbeispiele der Erfindung, auf die die Erfindung jedoch nicht beschränkt ist, sind im folgenden beschrieben und anhand der Figuren 1 bis 4 erläutert.Embodiments of the invention, to which the invention is not limited, are described below and based on the FIGS. 1 to 4 explained.

Es zeigen:Show it:

Figur 1FIG. 1
ein erstes Ausführungsbeispiel mit in etwa drei gleichen Reibschweißquerschnitten,a first embodiment with approximately three identical friction-welded cross-sections,
Figur 2FIG. 2
ein zweites Ausführungsbeispiel mit unterschiedlichen Reibschweißquerschnitten und unterschiedlichen Fügeebenen,A second embodiment with different Reibschweißquerschnitten and different joining levels,
Figur 3FIG. 3
ein drittes Ausführungsbeispiel mit nahezu gleichen Reibschweißquerschnitten in unterschiedlichen Fügeebenen,a third embodiment with almost identical Reibschweißquerschnitten in different joining levels,
Figur 4FIG. 4
ein viertes Ausführungsbeispiel mit nahezu gleichen Reibschweißquerschnitten und drei verschiedenen Fügeebenen, wobei drei Kühlbereiche gebildet werden.a fourth embodiment with almost the same Reibschweißquerschnitten and three different joining planes, with three cooling areas are formed.

Figur 1 zeigt einen Kühlkanalkolben, der ein Oberteil 2 und ein Unterteil 3 aufweist. Das Oberteil 2 weist in an sich bekannter Weise eine Brennraummulde 4 sowie ein radial umlaufendes Ringfeld 5 mit nicht näher bezeichneten Ringnuten auf. Unterhalb des Oberteiles 2 ist das Unterteil 3 angefügt, das seinerseits eine Bolzenbohrung 6 sowie einen Kolbenschaft 7 aufweist. Das Oberteil 2 wird insbesondere mit einem Reibschweißverfahren in drei Fügebereichen 8 bis 10 mit dem Unterteil 3 verbunden. In dem ersten Fügebereich 8 stehen sich ein Fügesteg 11 des Oberteiles 2 und ein Fügesteg 12 des Unterteiles 3 gegenüber. In dem zweiten Fügebereich 9 stehen sich ein Fügesteg 13 des Oberteiles 2 und ein Fügesteg 14 des Unterteiles 3 gegenüber. Schließlich sind in dem dritten Fügebereich 10 noch ein Fügesteg 15 des Oberteiles 2 und ein Fügesteg 16 des Unterteiles 3 angeordnet. Der erste Fügebereich 11 ist in einer ersten Fügeebene 17 und die zweiten Fügebereiche 9, 10 sind beide in einer zweiten Fügeebene 18 angeordnet. Dabei sind das Oberteil 2 und das Unterteil 13 so gestaltet, dass sie mit ihren radial umlaufenden Fügestegen 11 bis 14 einen hinter dem Ringfeld 5 liegenden Kühlkanal 19 bilden. Durch die beiden weiteren Fügebereiche 9, 10 entsteht zwischenliegend ein Hohlraum, der zur besseren Kräfteverteilung und zur Reduzierung von Gewicht im Kolbenboden führt. Während des Reibschweißvorganges entstehen umlaufende Schweißwülste, die entfernt werden können (insbesondere die Reibschweißwulst unterhalb des Ringfeldes 5), oder auch bestehen bleiben können, da sie entweder nicht störend oder nicht mehr zugänglich sind (wie beispielsweise die Reibschweißwülste, die innenliegend bei den beiden Fügebereichen 9, 10 entstehen). FIG. 1 shows a cooling channel piston having an upper part 2 and a lower part 3. The upper part 2 has in known manner a combustion bowl 4 and a radially encircling ring field 5 with unspecified annular grooves. Below the upper part 2, the lower part 3 is added, which in turn has a pin bore 6 and a piston skirt 7. The upper part 2 is in particular connected to the lower part 3 with a friction welding process in three joining regions 8 to 10. In the first joining region 8, a joining web 11 of the upper part 2 and a joining web 12 of the lower part 3 are opposite. In the second joining region 9, a joining web 13 of the upper part 2 and a joining web 14 of the lower part 3 are opposite. Finally, in the third joining region 10, a joining web 15 of the upper part 2 and a joining web 16 of the lower part 3 are arranged. The first joining area 11 is in a first joining plane 17 and the second joining regions 9, 10 are both arranged in a second joining plane 18. In this case, the upper part 2 and the lower part 13 are designed so that they form a lying behind the ring field 5 cooling channel 19 with their radially surrounding joining webs 11. The two further joining areas 9, 10 create a cavity between them which leads to a better distribution of forces and to a reduction in weight in the piston crown. During Reibschweißvorganges arise circumferential weld beads that can be removed (especially the Reibschweißwulst below the ring field 5), or may persist, either they are not disturbing or no longer accessible (such as the Reibschweißwülste, the inside of the two joining areas. 9 , 10 arise).

Figur 2 zeigt den Kühlkanalkolben 1, der ebenfalls drei Fügebereiche 8 bis 10 mit zugehörigen Fügestegen 11 bis 16 aufweist. Bei diesem Ausführungsbeispiel liegt der erste Fügebereich 8 in etwa unterhalb des Ringfeldes 5, während der zweite Fügebereich 9 in etwa im tiefsten Scheitelpunkt der Brennraummulde 4 vorhanden ist. Zur Abstützung des höchsten Scheitelpunktes der Brennraummulde 4 ist der dritte Fügebereich 10 mit seinen einander gegenüberliegenden Fügestegen 15, 16 auf der Bewegungsachse des Hubes des Kühlkanalkolbens 1 während seines Betriebes angeordnet. Dies wiederum führt zu dem schon in Figur 1 beschriebenen Kühlkanal 19, während hier aufgrund der Gestaltung des Oberteiles 2 und des Unterteiles 3 mit den Fügestegen 13 bis 16 ein koaxial hinter dem Kühlkanal 19 liegender weiterer Kühlkanal 21 geschaffen wird. Die Öffnungen für die Zufuhr und den Ablauf des in dem Kühlkanal 19, 21 zirkulierenden Kühlmediums sind vorhanden, hier aber wegen der besseren Übersichtlichkeit (genauso wie in den anderen Figuren) weggelassen. FIG. 2 shows the cooling channel piston 1, which also has three joining areas 8 to 10 with associated joining webs 11 to 16. In this embodiment, the first joining region 8 is located approximately below the annular field 5, while the second joining region 9 is present approximately at the lowest vertex of the combustion chamber trough 4. To support the highest vertex of the combustion bowl 4, the third joining region 10 is arranged with its mutually opposite joining webs 15, 16 on the axis of movement of the stroke of the cooling channel piston 1 during its operation. This in turn leads to the already in FIG. 1 described cooling channel 19, while here, due to the design of the upper part 2 and the lower part 3 with the joining webs 13 to 16 coaxially behind the cooling channel 19 lying further cooling channel 21 is created. The openings for the supply and the flow of the circulating in the cooling channel 19, 21 cooling medium are present, but omitted here for the sake of clarity (as well as in the other figures).

Die Fügestege 11 bis 17 weisen unterschiedlichen Querschnitt auf und liegen in unterschiedlichen Fügeebenen 17, 18, 20.The joining webs 11 to 17 have different cross-sections and lie in different joining planes 17, 18, 20.

Figur 3 zeigt den Kühlkanalkolben 1, bei dem ebenfalls drei Fügebereiche 8 bis 10 vorhanden sind, wobei deren Fügestege 11 bis 16 nahezu gleichen Querschnitt aufweisen, aber in drei unterschiedlichen Fügeebenen 17, 18, 20 angeordnet sind. Auch hier sind wieder zwei Kühlkanäle 19, 21 vorhanden. FIG. 3 shows the cooling channel piston 1, in which also three joining regions 8 to 10 are present, wherein the joining webs 11 to 16 have almost the same cross-section, but in three different joining planes 17, 18, 20 are arranged. Again, two cooling channels 19, 21 are available again.

Figur 4 zeigt den Kühlkanalkolben 1 mit drei Fügebereichen 8 bis 10 und den zugehörigen Fügestegen 11 bis 16, wobei die Fügestege nahezu gleichen Querschnitt aufweisen, aber (gestuft) in drei voneinander verschiedenen Fügeebene 17, 18, 20 angeordnet sind. Aufgrund der Gestaltung des Unterteiles 2 werden nicht nur zwei Kühlkanäle 19, 21 gebildet, sondern es ist im Innenbereich 22 (der sich unterhalb des oberen Scheitelpunktes der Brennraummulde 4 erstreckt) ein weiterer geschlossener Raum realisiert, der ebenfalls als Kühlbereich fungieren kann. FIG. 4 shows the cooling channel piston 1 with three joining areas 8 to 10 and the associated joining webs 11 to 16, wherein the joining webs have almost the same cross-section, but (stepped) in three mutually different joining plane 17, 18, 20 are arranged. Due to the design of the lower part 2 not only two cooling channels 19, 21 are formed, but it is in the inner region 22 (which extends below the upper vertex of the combustion bowl 4) realized another closed space, which can also act as a cooling area.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1.1.
KühlkanalkolbenCooling channel piston
2.Second
Oberteiltop
3.Third
Unterteillower part
4.4th
BrennraummuldeCombustion bowl
5.5th
Ringfeldring box
6.6th
Bolzenbohrungpin bore
7.7th
Kolbenschaftpiston shaft
8.8th.
Erster FügebereichFirst joining area
9.9th
Zweiter FügebereichSecond joining area
10.10th
Dritter FügebereichThird joining area
11.11th
Fügestegjoining web
12.12th
Fügestegjoining web
13.13th
Fügestegjoining web
14.14th
Fügestegjoining web
15.15th
Fügestegjoining web
16.16th
Fügestegjoining web
17.17th
Erste FügeebeneFirst joining level
18.18th
Zweite FügeebeneSecond joining level
19.19th
Kühlkanalcooling channel
20.20th
Dritte FügeebeneThird joining level
21.21st
Weiterer KühlkanalFurther cooling channel
22.22nd
Innenbereichinterior

Claims (8)

  1. Cooling-duct piston (1) of an internal combustion engine, with an upper part (2) and a lower part (3) which can be produced separately from one another and can subsequently be joined together in a frictionwelding operation, the upper part (2) forming, together with the lower part (3), at least one cooling duct (19) arranged radially behind an annular field (5), and, furthermore, the upper part (2) having at least three radially continuous joining webs (11, 13, 15) and the lower part (3) likewise having at least three radially continuous joining webs (12, 14), which are brought together during a joining operation and via which the upper part (2) is connected fixedly to the lower part (3).
  2. Cooling-duct piston (1), in which the upper part (2) and the lower part (3) are configured in such a way that with their joining webs (11 to 14) they form a cooling duct (19), according to Claim 1, characterized in that the lower part (2) and the upper part (3) are configured in such a way that with their further joining webs (15, 16) they form at least one further cooling duct (21).
  3. Piston or cooling-duct piston (1) according to Claim 1 or 2, characterized in that the joining webs (11 to 16) have approximately an identical cross section in three identical joining regions (8 to 10) or in joining regions (8 to 10) which are different from one another.
  4. Piston or cooling-duct piston (1) according to one of Claims 1 to 3, characterized in that the bearing faces of the mutually confronting joining webs (11 to 16) lie in three identical joining planes.
  5. Piston or cooling-duct piston (1) according to one of Claims 1 to 3, characterized in that the bearing faces of the mutually confronting joining webs (11 to 16) lie in three different joining planes.
  6. Piston or cooling-duct piston (1) according to one of Claims 1 to 3, characterized in that the bearing faces of the mutually confronting joining webs (11 to 16) lie in two identical joining planes and in a joining plane different from these.
  7. Piston or cooling-duct piston (1) according to one of Claims 1 to 6, characterized in that the upper part (2) consists of the same material as the lower part (3).
  8. Piston or cooling-duct piston (1) according to one of Claims 1 to 6, characterized in that the upper part (2) consists of a material other than that of the lower part (3).
EP05784012A 2005-09-17 2005-09-17 Piston, especially cooling channel piston, comprising three friction-welded zones Not-in-force EP1926902B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/010061 WO2007031107A1 (en) 2005-09-17 2005-09-17 Piston, especially cooling channel piston, comprising three friction-welded zones

Publications (2)

Publication Number Publication Date
EP1926902A1 EP1926902A1 (en) 2008-06-04
EP1926902B1 true EP1926902B1 (en) 2010-04-14

Family

ID=36579074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05784012A Not-in-force EP1926902B1 (en) 2005-09-17 2005-09-17 Piston, especially cooling channel piston, comprising three friction-welded zones

Country Status (5)

Country Link
US (1) US8011288B2 (en)
EP (1) EP1926902B1 (en)
AT (1) ATE464466T1 (en)
DE (1) DE502005009435D1 (en)
WO (1) WO2007031107A1 (en)

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US8327537B2 (en) * 2009-12-23 2012-12-11 Federal Mogul Corporation Reinforced dual gallery piston and method of construction
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Also Published As

Publication number Publication date
ATE464466T1 (en) 2010-04-15
WO2007031107A1 (en) 2007-03-22
US20080229923A1 (en) 2008-09-25
DE502005009435D1 (en) 2010-05-27
US8011288B2 (en) 2011-09-06
EP1926902A1 (en) 2008-06-04

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