EP1926902A1 - Piston, especially cooling channel piston, comprising three friction-welded zones - Google Patents

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

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Publication number
EP1926902A1
EP1926902A1 EP05784012A EP05784012A EP1926902A1 EP 1926902 A1 EP1926902 A1 EP 1926902A1 EP 05784012 A EP05784012 A EP 05784012A EP 05784012 A EP05784012 A EP 05784012A EP 1926902 A1 EP1926902 A1 EP 1926902A1
Authority
EP
European Patent Office
Prior art keywords
joining
piston
cooling channel
webs
different
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.)
Granted
Application number
EP05784012A
Other languages
German (de)
French (fr)
Other versions
EP1926902B1 (en
Inventor
Volker Gniesmer
Gerhard Luz
Emmerich Ottliczky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt GmbH
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Filing date
Publication date
Application filed by KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP1926902A1 publication Critical patent/EP1926902A1/en
Application granted granted Critical
Publication of EP1926902B1 publication Critical patent/EP1926902B1/en
Not-in-force 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 
    • F02F3/0015—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 piston, in particular a cooling channel piston, an internal combustion engine according to the features of the preamble of patent claim 1.
  • 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 extent 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.
  • both the upper part and the lower part are designed in such a way that they form, together with the mutually corresponding joints after the joining process, a cooling channel lying behind the annular field for the circulation of cooling medium.
  • a cooling channel lying behind the annular field for the circulation of cooling medium.
  • both the upper part and the lower part have at least three radially surrounding joining webs.
  • 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) joint areas are interconnected.
  • This also increases the long-term stability over the life of the piston during its operation in the internal combustion engine.
  • the support of the combustion chamber trough is improved, in particular stiffened, by the further joining steps, so that the material thickness in the region of the combustion chamber trough can be reduced, which leads to weight spatter.
  • 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 trough) ) 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. As a result, a nearly equal structural strength is achieved within the piston crown.
  • 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.
  • the joining process is, in a particularly advantageous manner, a friction welding process, since this makes it possible to work all three joint areas simultaneously and thus to non-releasably connect the upper part to 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.
  • 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.
  • 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 may consist of a lightweight material (such as aluminum), while the lower part consists of an iron material (for example gray cast iron).
  • FIG. 1 shows a first exemplary embodiment with approximately three identical friction-welded cross-sections
  • FIG. 2 shows a second exemplary embodiment with different friction-welded cross sections and different joining planes
  • FIG. 3 shows a third exemplary embodiment with virtually identical friction-welded cross sections in different joining planes
  • Figure 4 shows a fourth embodiment with almost the same Reibsch spaquerroughen and three different joining planes, wherein three cooling areas are formed.
  • FIG. 1 shows a cooling channel piston which has 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 Bolzenboh- tion 6 and a piston shaft 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 region 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.
  • FIG. 2 shows the cooling channel piston 1, which likewise has three joining regions 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 with its mutually opposite joining webs 15, 16 on the Motion axis of the stroke of the cooling channel piston 1 is arranged during its operation.
  • This leads to the cooling channel 19 already described in FIG. 1, while here, due to the design of the upper part 2 and the lower part 3 with the joining webs 13 to 16, a further cooling channel 21 lying coaxially behind the cooling channel 19 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 joint 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 regions 8 to 10 and the associated joining webs 11 to 16, wherein the joining webs have almost the same cross section but are arranged (stepped) in three mutually different joining planes 17, 18, 20. 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.
  • cooling channels can also be cavities, which are not flowed through by a cooling medium but serve to save weight in the region of the upper part (piston crown).
  • the invention is equally applicable to one-piece pistons (as shown in the embodiments, wherein the finished one-piece piston from the top and the bottom is joined together) as well as in finished multi-part piston (in particular pendulum stock piston). LIST OF REFERENCE NUMBERS
  • First joining plane 20 18. Second joining plane

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

B E S C H R E I B U N G DESCRIPTION
Kolben, insbesondere Kühlkanalkolben, mit drei ReϊbschweißzonenPiston, in particular cooling channel piston, with three reverse-welding zones
Die Erfindung betrifft einen Kolben, insbesondere einen Kühlkanalkolben, einer Brennkraftmaschine gemäß den Merkmalen des Oberbegriffes des Patentanspruchs 1.The invention relates to a piston, in particular a cooling channel piston, 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 auf- weist. 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 US 6,155,157 a Kühlkanalkolben 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 extent 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 O- berteil 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 Fügestel- Ie, 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. Der Erfindung liegt daher die Aufgabe zugrunde, einen gattungsgemäßen Kolben, insbesondere Kühlkanalkolben, derart weiterzubilden, dass er hinsichtlich seiner Festigkeit und Langzeitstabilität verbesserte Eigenschaften aufweist.In this cooling channel piston known from US Pat. No. 6,155,157, both the upper part and the lower part are designed in such a way that they form, together with the mutually corresponding joints after the joining process, a cooling channel lying behind the annular field for the circulation of cooling medium. For this purpose, it is necessary to place the inner joint quite close to the outer joint Ie, 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. The invention is therefore the object of developing a generic piston, in particular cooling channel piston, 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 vorgesehen, dass sowohl das Oberteil als auch das Unterteil zumindest drei radial umlaufende Fügestege aufweist. 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 Verbrennungs- drücke 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 Ge- wichtserspamis führt.According to the invention, it is provided that both the upper part and the lower part have at least three radially surrounding joining webs. 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) joint areas are interconnected. This results in a higher strength of the entire piston crown, so that the ignition and combustion pressures occurring can be absorbed much better. This also increases the long-term stability over the life of the piston during its operation in the internal combustion engine. In addition, the support of the combustion chamber trough is improved, in particular stiffened, by the further joining steps, so that the material thickness in the region of the combustion chamber trough can be reduced, which leads to weight spatter.
Weiterhin ist erfindungsgemäß vorgesehen, dass das Oberteil und das Unterteil derart gestaltet sind, dass sie mit den weiteren Fügestegen einen weiteren Kühlkanal bilden. 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. 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.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 trough) ) 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 a development of the invention, the joining webs in three different joint areas have approximately the same cross-section. As a result, a nearly equal structural strength is achieved within the piston crown. 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.
Bei dem Fügevorgang handelt es sich in besonders vorteilhafter Weise um ein Reibschweißverfahren, da dieses es gestattet, alle drei Fügebereiche gleichzeitig zu be- arbeiten 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 Un- terteil aus einem Eisenwerkstoff (zum Beispiel Grauguß) besteht.The joining process is, in a particularly advantageous manner, a friction welding process, since this makes it possible to work all three joint areas simultaneously and thus to non-releasably connect the upper part to 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 may consist of a lightweight material (such as aluminum), while the lower part consists of an iron material (for example gray cast iron).
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 explained with reference to Figures 1 to 4.
Es zeigen:Show it:
Figur 1 ein erstes Ausführungsbeispiel mit in etwa drei gleichen Reibschweißquerschnitten,FIG. 1 shows a first exemplary embodiment with approximately three identical friction-welded cross-sections,
Figur 2 ein zweites Ausführungsbeispiel mit unterschiedlichen Reibschweißquerschnitten und unterschiedlichen Fügeebenen,FIG. 2 shows a second exemplary embodiment with different friction-welded cross sections and different joining planes,
Figur 3 ein drittes Ausführungsbeispiel mit nahezu gleichen Reibschweißquerschnitten in unterschiedlichen Fügeebenen, Figur 4 ein viertes Ausführungsbeispiel mit nahezu gleichen Reibschweißquerschnitten und drei verschiedenen Fügeebenen, wobei drei Kühlbereiche gebildet werden.FIG. 3 shows a third exemplary embodiment with virtually identical friction-welded cross sections in different joining planes, Figure 4 shows a fourth embodiment with almost the same Reibschweißquerschnitten and three different joining planes, wherein 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 Bolzenboh- rung 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 Koibenboden 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 which has 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 Bolzenboh- tion 6 and a piston shaft 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 region 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. By the two other joint areas 9, 10 is formed between a cavity, which leads to better distribution of forces and to reduce weight in the Koibenboden. 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 likewise has three joining regions 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 chamber trough 4, the third joining region 10 with its mutually opposite joining webs 15, 16 on the Motion axis of the stroke of the cooling channel piston 1 is arranged during its operation. This in turn leads to the cooling channel 19 already described in FIG. 1, while here, due to the design of the upper part 2 and the lower part 3 with the joining webs 13 to 16, a further cooling channel 21 lying coaxially behind the cooling channel 19 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 un- terschiedlichen Fügeebenen 17, 18, 20.The joining webs 11 to 17 have different cross-sections and lie in different joint 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.Figure 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 regions 8 to 10 and the associated joining webs 11 to 16, wherein the joining webs have almost the same cross section but are arranged (stepped) in three mutually different joining planes 17, 18, 20. 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.
Schließlich sei noch angemerkt, dass es sich bei den Kühlkanälen auch um Hohlräume handeln kann, die nicht von einem Kühlmedium durchströmt werden, sondern der Gewichtsersparnis im Bereich des Oberteiles (Kolbenboden) dienen. Ebenso ist die Erfindung genauso anwendbar bei einteiligen Kolben (wie in den Ausführungsbeispielen gezeigt, wobei der fertige einteilige Kolben aus dem Oberteil und dem Un- terteil zusammengefügt wird) wie auch bei fertigen mehrteiligen Kolben (insbesondere Pendelschaftkolben). BezugszeichenlisteFinally, it should also be noted that the cooling channels can also be cavities, which are not flowed through by a cooling medium but serve to save weight in the region of the upper part (piston crown). Likewise, the invention is equally applicable to one-piece pistons (as shown in the embodiments, wherein the finished one-piece piston from the top and the bottom is joined together) as well as in finished multi-part piston (in particular pendulum stock piston). LIST OF REFERENCE NUMBERS
1. Kühlkanalkolben1. cooling channel piston
2. Oberteil 5 3. Unterteil2nd upper part 5 3rd lower part
4. Brennraummulde4. combustion chamber
5. Ringfeld5. Ring field
6. Bolzenbohrung6. Bolt hole
7. Kolbenschaft7. Piston shaft
10 8. Erster Fügebereich10 8. First joining area
9. Zweiter Fügebereich9. Second joining area
10. Dritter Fügebereich10. Third joining area
11. Fügesteg11th bridge
12. Fügesteg 15 13. Fügesteg12. Bridge 15 13. Bridge
14. Fügesteg14th bridge
15. Fügesteg15th bridge
16. Fügesteg16th bridge
17. Erste Fügeebene 20 18. Zweite Fügeebene17. First joining plane 20 18. Second joining plane
19. Kühlkanal19. Cooling channel
20. Dritte Fügeebene20. Third joining level
21. Weiterer Kühlkanal21. Further cooling channel
22. Innenbereich 22. Interior

Claims

P A T E N T A N S P R Ü C H E PATENT APPLICATIONS
1.1.
Kolben, insbesondere Kühlkanalkolben (1), einer Brennkraftmaschine mit einem O- berteil (2) sowie einem Unterteil (3), die separat voneinander herstellbar und anschließend zusammenfügbar sind, wobei das Oberteil (2) zumindest drei radial um- laufende Fügestege (11 , 13, 15) und das Unterteil (3) ebenfalls zumindest drei radial umlaufende Fügestege (12, 14) aufweist, die während eines Fügevorganges zusammengebracht werden und über die das Oberteil (2) fest mit dem Unterteil (3) verbunden wird.Pistons, in particular cooling channel pistons (1), of an internal combustion engine having an upper part (2) and a lower part (3) which can be produced separately from one another and subsequently joined together, wherein the upper part (2) has at least three radially surrounding joining webs (11, 13, 15) and the lower part (3) also has at least three radially surrounding joining webs (12, 14), which are brought together during a joining process and over which the upper part (2) is firmly connected to the lower part (3).
2.Second
Kühlkanalkolben (1), bei dem das Oberteil (2) und das Unterteil (3) derart gestaltet sind, dass sie mit ihren Fügestegen (11 bis 14) einen Kühlkanal (19) bilden, nach Anspruch 1 , dadurch gekennzeichnet, dass das Unterteil (2) und das Oberteil (3) derart gestaltet sind, dass sie mit ihren weiteren Fügestegen (15, 16) zumindest ei- nen weiteren Kühlkanal (21) bilden.Cooling channel piston (1), in which the upper part (2) and the lower part (3) are designed such that they form with their joining webs (11 to 14) a cooling channel (19) according to claim 1, characterized in that the lower part ( 2) and the upper part (3) are designed such that they form with their further joining webs (15, 16) at least one NEN further cooling channel (21).
3.Third
Kolben oder Kühlkanalkolben (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Fügestege (11 bis 16) in drei gleichen Fügebereichen (8 bis 10) oder in voneinander verschiedenen Fügebereichen (8 bis 10) in etwa einen gleichen Querschnitt aufweisen.Piston or cooling channel piston (1) according to claim 1 or 2, characterized in that the joining webs (11 to 16) in three identical joining regions (8 to 10) or in mutually different joining regions (8 to 10) have approximately the same cross section.
4.4th
Kolben oder Kühlkanalkolben (1) nach einem der Ansprüche 1 bis 3, dadurch ge- kennzeichnet, dass die Anlageflächen der einander zugewandten Fügestege (11 bis 16) in drei gleichen Fügeebenen, in drei verschiedenen Fügeebenen oder in zwei gleichen Fügeebenen und einer davon verschiedenen Fügeebene liegen. Piston or cooling channel piston (1) according to one of claims 1 to 3, characterized in that the contact surfaces of the mutually facing joining webs (11 to 16) in three identical joining planes, in three different joining planes or in two identical joining planes and a joining plane different therefrom lie.
5.5th
Kolben oder Kühlkanalkolben (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Fügevorgang ein Reibschweissen ist.Piston or cooling channel piston (1) according to one of claims 1 to 4, characterized in that the joining process is a friction welding.
6.6th
Kolben oder Kühlkanalkolben (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Oberteil (2) aus dem gleichen Material oder einem anderen Material besteht als das Unterteil (3). Piston or cooling channel piston (1) according to one of claims 1 to 5, characterized in that the upper part (2) consists of the same material or a different material than 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

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

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

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US8011288B2 (en) 2011-09-06
ATE464466T1 (en) 2010-04-15
DE502005009435D1 (en) 2010-05-27
US20080229923A1 (en) 2008-09-25
EP1926902B1 (en) 2010-04-14
WO2007031107A1 (en) 2007-03-22

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