EP2652302B1 - Piston for an internal combustion engine and method for the production thereof - Google Patents

Piston for an internal combustion engine and method for the production thereof Download PDF

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Publication number
EP2652302B1
EP2652302B1 EP11833594.2A EP11833594A EP2652302B1 EP 2652302 B1 EP2652302 B1 EP 2652302B1 EP 11833594 A EP11833594 A EP 11833594A EP 2652302 B1 EP2652302 B1 EP 2652302B1
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EP
European Patent Office
Prior art keywords
piston
filling
cooling channel
bores
bore
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EP11833594.2A
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German (de)
French (fr)
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EP2652302A2 (en
Inventor
Ulrich Bischofberger
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Mahle International GmbH
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Mahle International 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/18—Pistons  having cooling means the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P1/00—Air cooling
    • F01P1/04—Arrangements for cooling pistons

Definitions

  • the present invention relates to a piston for an internal combustion engine, having a piston head and a piston skirt, wherein the piston head has a circumferential annular portion and in the region of the annular part a circumferential cooling channel, wherein the piston skirt has hub bores provided with piston bosses, which have hub connections on the underside of the piston head are arranged, wherein the piston hubs are interconnected via running surfaces.
  • the solution is that within the piston hubs four axial, outwardly closed holes are provided, which are respectively inserted into the hub connections and arranged between a tread and a hub bore in order to achieve a particularly uniform temperature distribution in the piston that the holes in the Cooling channel open, such that an outwardly closed cavity is formed.
  • the piston according to the invention is characterized in that the heat generated in the region of the piston crown is conducted via the piston head into the piston hubs and discharged via the comparatively large-area running surfaces.
  • a uniform heat distribution over the entire piston is achieved during operation.
  • a more effective cooling of the entire piston is achieved.
  • the filling with the coolant preferably has a filling level up to half the height of the cooling channel in order to achieve a shaker effect and thus a particularly effective cooling.
  • the filling may further contain sodium oxides and / or potassium oxides, if during the filling any existing dry air has reacted with the coolant.
  • the piston according to the invention can consist of an iron-based material, for example a material from the group consisting of precipitation-hardening steels, tempered steels, high-strength cast iron and cast iron with lamellar graphite.
  • the FIGS. 1 to 4 show an embodiment of a piston 10 according to the invention.
  • the piston 10 may be a one-piece or multi-piece piston.
  • the piston 10 may be made of a steel material and / or a light metal material.
  • the FIGS. 1 to 3 show by way of example a one-piece box piston 10.
  • the piston 10 has a piston head 11 with a combustion bowl 13 having the piston head 12, a peripheral land 14 and a ring portion 15 for receiving piston rings (not shown) on. In the amount of the ring section 15, a circumferential cooling channel 23 is provided.
  • the piston 10 further includes a piston stem 16 with piston bosses 17 and hub bores 18 for receiving a piston pin (not shown).
  • the piston hubs 17 are connected via hub connections 19 with the bottom 11 a of the piston head.
  • the piston hubs 17 are connected to one another via running surfaces 21, 22 (cf. FIG. 2 ).
  • the piston shaft 16 has four axial bores 24a, 24b, 24c, 24d in the exemplary embodiment.
  • the bores 24a-d are each introduced into the piston hubs and arranged between a running surface 21, 22 and the hub bore 18.
  • the bores 24a-d open into the cooling channel 23.
  • the piston 10 may, for example, be cast in a conventional manner, wherein the cooling channel 23 and the bores 24a-d can be introduced in a conventional manner by means of a salt core. It is essential that at least one bore 24a has an opening 25 to the outside.
  • the coolant 27, namely sodium, potassium or an alloy of both metals is filled through the opening 25 into the bore 24a.
  • the coolant 27 is distributed in the cooling channel 23 and in the further holes 24b-d.
  • the opening 25 is then sealed, in the embodiment by means of a pressed-steel ball 26.
  • the opening 25 can also be closed, for example. By welding a lid or pressing a cap (not shown).
  • the size of the holes 24a-d and the filling amount of the coolant 27 depend on the size and the material of the piston 10. On average, about. 10g to 40g coolant 27 per piston 10 required.
  • the cooling capacity can be controlled via the amount of added coolant 27. Conveniently, results in the cooling passage 23, a level corresponding to approximately half the height of the cooling channel 23. In this case, during operation, the known shaker effect can additionally be used for effective cooling.
  • For sodium as coolant 27 with a temperature in operation of 220 ° C results in a cooling capacity of 350kW / m 2 a maximum surface temperature of the piston 10 of about 260 ° C.
  • the underside 11a of the piston head 11 can be cooled by injection with cooling oil.
  • a lance is inserted through the opening 25 and purged by means of nitrogen or other suitable inert gas or by means of dry air.
  • the coolant 27 for example sodium and / or potassium, which is solid at room temperature, it is pressed under protective gas (for example nitrogen, inert gas or dry air) through the opening 25 by means of a press so that the coolant 27 is wire-shaped into the bore 24a or let the cooling channel 23 press.
  • protective gas for example nitrogen, inert gas or dry air
  • Another method for filling the bore 24a is characterized in that after flushing with nitrogen, inert gas or dry air, the bores 24a-d and the cooling channel 23 are evacuated and the coolant 27 is introduced in a vacuum.
  • the coolant 27 can move more easily in the cooling channel 23 back and forth and in the bores 24a-d in and out, since it is not hindered by existing inert gas.
  • Another possibility for removing the protective gas from the cooling channel 23 or the bores 24a-d is to use nitrogen or dry air (ie essentially a mixture of nitrogen and oxygen) as protective gas and a small amount of the coolant 27 Lithium, according to experience about 1.8mg to 2.0mg lithium per cubic centimeter gas space (ie volume of the cooling channel 23 plus volume of the holes 24a-d). While sodium and potassium react with oxygen to form oxides, the lithium reacts with nitrogen to form lithium nitride. The protective gas is thus almost completely bound as a solid in the coolant 27.
  • nitrogen or dry air ie essentially a mixture of nitrogen and oxygen

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

Description

Die vorliegende Erfindung betrifft einen Kolben für einen Verbrennungsmotor, mit einem Kolbenkopf und einem Kolbenschaft, wobei der Kolbenkopf eine umlaufende Ringpartie sowie im Bereich der Ringpartie einen umlaufenden Kühlkanal aufweist, wobei der Kolbenschaft mit Nabenbohrungen versehene Kolbennaben aufweist, die über Nabenanbindungen an der Unterseite des Kolbenkopfes angeordnet sind, wobei die Kolbennaben über Laufflächen miteinander verbunden sind. Aus der DE 726 685 C ist ein gattungsgemäßer Kolben für einen Verbrennungsmotor bekannt, mit einem Kolbenkopf und einem Kolbenschaft, wobei der Kolbenkopf eine umlaufende Ringpartie sowie im Bereich der Ringpartie einen umlaufenden Kühlkanal aufweist, wobei der Kolbenschaft mit Nabenbohrungen versehene Kolbennaben aufweist, die über Nabenanbindungen an der Unterseite des Kolbenkopfes angeordnet sind, wobei die Kolbennaben über Laufflächen miteinander verbunden sind und wobei mindestens eine nach außen verschlossene Bohrung vorgesehen ist, die zwischen einer Lauffläche und einer Nabenbohrung angeordnet ist.The present invention relates to a piston for an internal combustion engine, having a piston head and a piston skirt, wherein the piston head has a circumferential annular portion and in the region of the annular part a circumferential cooling channel, wherein the piston skirt has hub bores provided with piston bosses, which have hub connections on the underside of the piston head are arranged, wherein the piston hubs are interconnected via running surfaces. From the DE 726 685 C a generic piston for an internal combustion engine is known, comprising a piston head and a piston skirt, wherein the piston head has a circumferential annular portion and in the region of the annular part a circumferential cooling channel, wherein the piston shaft provided with hub bores piston hubs arranged via hub connections on the underside of the piston head are, wherein the piston hubs are interconnected via running surfaces and wherein at least one outwardly closed bore is provided, which is arranged between a running surface and a hub bore.

In modernen Verbrennungsmotoren sind die Kolben im Bereich der Kolbenböden immer höheren Temperaturbelastungen ausgesetzt. Dies führt im Betrieb zu erheblichen Temperaturunterschieden zwischen dem Kolbenkopf und dem Kolbenschaft. Damit ist auch das Einbauspiel der Kolben im kalten Motor unterschiedlich zum Einbauspiel im warmen Motor.In modern internal combustion engines, the pistons in the region of the piston crowns are exposed to ever higher temperature loads. This results in operation to significant temperature differences between the piston head and the piston skirt. Thus, the installation play of the pistons in the cold engine is different to the installation play in the warm engine.

Die Aufgabe der vorliegenden Erfindung besteht darin, einen gattungsgemäßen Kolben so weiterzuentwickeln, dass sich im Betrieb eine gleichmäßigere Temperaturverteilung zwischen dem Kolbenkopf und dem Kolbenschaft einstellt.The object of the present invention is to develop a generic piston so that sets a more uniform temperature distribution between the piston head and the piston skirt during operation.

Die Lösung besteht darin, dass innerhalb der Kolbennaben vier axiale, nach außen verschlossene Bohrungen vorgesehen sind, die jeweils in die Nabenanbindungen eingebracht und zwischen einer Lauffläche und einer Nabenbohrung angeordnet sind, um eine besonders gleichmäßige Temperaturverteilung im Kolben zu erreichen, dass die Bohrungen in den Kühlkanal münden, derart, dass ein nach außen verschlossener Hohlraum gebildet ist.The solution is that within the piston hubs four axial, outwardly closed holes are provided, which are respectively inserted into the hub connections and arranged between a tread and a hub bore in order to achieve a particularly uniform temperature distribution in the piston that the holes in the Cooling channel open, such that an outwardly closed cavity is formed.

Der erfindungsgemäße Kolben zeichnet sich dadurch aus, dass die im Bereich des Kolbenbodens erzeugte Wärme über den Kolbenkopf in die Kolbennaben geleitet und über die vergleichsweise großflächigen Laufflächen abgegeben wird. Damit wird im Betrieb eine gleichmäßige Wärmeverteilung über den gesamten Kolben erreicht. Ferner wird eine effektivere Kühlung des gesamten Kolbens erzielt.The piston according to the invention is characterized in that the heat generated in the region of the piston crown is conducted via the piston head into the piston hubs and discharged via the comparatively large-area running surfaces. Thus, a uniform heat distribution over the entire piston is achieved during operation. Furthermore, a more effective cooling of the entire piston is achieved.

Wenn zusätzlich die Unterseite des Kolbenkopfes mit Kühlöl gekühlt wird, wird die Bildung von Ölkohle vermieden. Insgesamt ist außerdem der Kühlölverbrauch reduziert.In addition, if the bottom of the piston head is cooled with cooling oil, the formation of oil carbon is avoided. Overall, the cooling oil consumption is also reduced.

Da die Differenz im Einbauspiel des Kolbens zwischen kaltem und warmem Motor verringert wird, kann bereits beim Einbau des Kolbens ein geringeres Spiel als bisher eingestellt werden. Ferner werden im Betrieb Reibungsverluste verringert, indem im noch kalten Motor die Laufflächen des Kolbens erwärmt werden. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen. Genau eine Bohrung weist zweckmäßigerweise eine Öffnung nach außen auf, die mittels eines Verschlusselements verschlossen ist.Since the difference in the installation clearance of the piston between the cold and warm engine is reduced, already during installation of the piston, a lesser game than previously set. Furthermore, during operation, friction losses are reduced by heating the running surfaces of the piston in the still cold engine. Advantageous developments emerge from the subclaims. Exactly one bore expediently has an opening to the outside, which is closed by means of a closure element.

Die Füllung mit dem Kühlmittel weist vorzugsweise eine Füllhöhe bis zur halben Höhe des Kühlkanals auf, um einen Shaker-Effekt und damit eine besonders wirksame Kühlung zu erzielen.The filling with the coolant preferably has a filling level up to half the height of the cooling channel in order to achieve a shaker effect and thus a particularly effective cooling.

Insbesondere wenn der Anteil der Verbrennungswärme, welcher während des Motorbetriebs in den Kolben abfließt, begrenzt werden soll, kann dies mit der Menge an eingefülltem Kühlmittel gesteuert werden. Es hat sich gezeigt, dass mitunter bereits eine Füllung von 3-5% des Kühlkanalvolumens mit dem Kühlmittel ausreicht, um die Funktion des Kolbens sicherzustellen.In particular, if the proportion of the heat of combustion, which flows into the piston during engine operation, should be limited, this can be controlled by the amount of coolant introduced. It has been found that sometimes even a filling of 3-5% of the cooling channel volume with the coolant is sufficient to ensure the function of the piston.

Die Füllung kann aus Kalium, Natrium oder einer Legierung aus beiden Metallen bestehen. Besonders zweckmäßig ist eine Füllung aus einer Kalium-Natrium-Legierung mit 22 Gew.-% Natrium und 78 Gew.-% Kalium, da diese Legierung einen besonders niedrigen Schmelzpunkt aufweist.The filling can consist of potassium, sodium or an alloy of both metals. Particularly useful is a filling of a potassium-sodium alloy with 22 wt .-% sodium and 78 wt .-% potassium, since this alloy has a particularly low melting point.

Die Füllung kann zusätzlich Lithium und/oder Lithiumnitrid enthalten. Falls beim Befüllen Stickstoff als Schutzgas verwendet wird, kann dieses mit dem Lithium zu Lithiumnitrid abreagieren und auf diese Weise aus dem Kühlkanal entfernt werden.The filling may additionally contain lithium and / or lithium nitride. If nitrogen is used as a protective gas during filling, this can react with the lithium to lithium nitride and be removed in this way from the cooling channel.

Die Füllung kann ferner Natriumoxide und/oder Kaliumoxide enthalten, falls während des Befüllens ggf. vorhandene trockene Luft mit dem Kühlmittel reagiert hat.The filling may further contain sodium oxides and / or potassium oxides, if during the filling any existing dry air has reacted with the coolant.

Der erfindungsgemäße Kolben kann aus einem eisenbasierten Werkstoff, bspw. einem Werkstoff aus der Gruppe umfassend ausscheidungshärtende Stähle, Vergütungsstähle hochfestes Gusseisen und Gusseisen mit Lamellengraphit bestehen.The piston according to the invention can consist of an iron-based material, for example a material from the group consisting of precipitation-hardening steels, tempered steels, high-strength cast iron and cast iron with lamellar graphite.

Ein Ausführungsbeispiel der vorliegenden Erfindung wird im Folgenden anhand der beigefügten Zeichnungen näher erläutert. Es zeigen in einer schematischen, nicht maßstabsgetreuen Darstellung:

Figur 1
ein Ausführungsbeispiel eines erfindungsgemäßen Kolbens, teilweise im Schnitt;
Figur 2
einen Schnitt entlang der Linie II - II in Figur 1;
Figur 3
einen Schnitt entlang der Linie III - III in Figur 1;
Figur 4
eine vergrößerte Teildarstellung aus Figur 3.
An embodiment of the present invention will be explained in more detail below with reference to the accompanying drawings. In a schematic, not to scale representation:
FIG. 1
an embodiment of a piston according to the invention, partially in section;
FIG. 2
a section along the line II - II in FIG. 1 ;
FIG. 3
a section along the line III - III in FIG. 1 ;
FIG. 4
an enlarged partial view FIG. 3 ,

Die Figuren 1 bis 4 zeigen ein Ausführungsbeispiel eines erfindungsgemäßen Kolbens 10. Der Kolben 10 kann ein einteiliger oder mehrteiliger Kolben sein. Der Kolben 10 kann aus einem Stahlwerkstoff und/oder einem Leichtmetallwerkstoff hergestellt sein. Die Figuren 1 bis 3 zeigen beispielhaft einen einteiligen Kastenkolben 10. Der Kolben 10 weist einen Kolbenkopf 11 mit einem eine Verbrennungsmulde 13 aufweisenden Kolbenboden 12, einem umlaufenden Feuersteg 14 und einer Ringpartie 15 zur Aufnahme von Kolbenringen (nicht dargestellt) auf. In Höhe der Ringpartie 15 ist ein umlaufender Kühlkanal 23 vorgesehen. Der Kolben 10 weist ferner einen Kolbenschaft 16 mit Kolbennaben 17 und Nabenbohrungen 18 zur Aufnahme eines Kolbenbolzens (nicht dargestellt) auf. Die Kolbennaben 17 sind über Nabenanbindungen 19 mit der Unterseite 11a des Kolbenkopfes verbunden. Die Kolbennaben 17 sind über Laufflächen 21, 22 miteinander verbunden (vgl. insbesondere Figur 2).The FIGS. 1 to 4 show an embodiment of a piston 10 according to the invention. The piston 10 may be a one-piece or multi-piece piston. The piston 10 may be made of a steel material and / or a light metal material. The FIGS. 1 to 3 show by way of example a one-piece box piston 10. The piston 10 has a piston head 11 with a combustion bowl 13 having the piston head 12, a peripheral land 14 and a ring portion 15 for receiving piston rings (not shown) on. In the amount of the ring section 15, a circumferential cooling channel 23 is provided. The piston 10 further includes a piston stem 16 with piston bosses 17 and hub bores 18 for receiving a piston pin (not shown). The piston hubs 17 are connected via hub connections 19 with the bottom 11 a of the piston head. The piston hubs 17 are connected to one another via running surfaces 21, 22 (cf. FIG. 2 ).

Der Kolbenschaft 16 weist im Ausführungsbeispiel vier axiale Bohrungen 24a, 24b, 24c, 24d auf. Die Bohrungen 24a-d sind jeweils in die Kolbennaben eingebracht und zwischen einer Lauffläche 21, 22 und der Nabenbohrung 18 angeordnet. Die Bohrungen 24a-d münden in den Kühlkanal 23. Im Ausführungsbeispiel kann der Kolbens 10 bspw. in an sich bekannter Weise gegossen sein, wobei der Kühlkanal 23 und die Bohrungen 24a-d in an sich bekannter Weise mittels eines Salzkerns eingebracht werden können. Wesentlich ist, dass zumindest eine Bohrung 24a eine Öffnung 25 nach außen aufweist. Erfindungsgemäß wird das Kühlmittel 27, nämlich Natrium, Kalium oder eine Legierung aus beiden Metallen durch die Öffnung 25 in die Bohrung 24a gefüllt. Von dort aus verteilt sich das Kühlmittel 27 im Kühlkanal 23 sowie in den weiteren Bohrungen 24b-d. Die Öffnung 25 wird anschließend dicht verschlossen, im Ausführungsbeispiel mittels einer eingepressten Stahlkugel 26. Die Öffnung 25 kann auch bspw. durch Aufschweißen eines Deckels oder Einpressen einer Kappe verschlossen werden (nicht dargestellt).The piston shaft 16 has four axial bores 24a, 24b, 24c, 24d in the exemplary embodiment. The bores 24a-d are each introduced into the piston hubs and arranged between a running surface 21, 22 and the hub bore 18. The bores 24a-d open into the cooling channel 23. In the exemplary embodiment, the piston 10 may, for example, be cast in a conventional manner, wherein the cooling channel 23 and the bores 24a-d can be introduced in a conventional manner by means of a salt core. It is essential that at least one bore 24a has an opening 25 to the outside. According to the invention, the coolant 27, namely sodium, potassium or an alloy of both metals is filled through the opening 25 into the bore 24a. From there, the coolant 27 is distributed in the cooling channel 23 and in the further holes 24b-d. The opening 25 is then sealed, in the embodiment by means of a pressed-steel ball 26. The opening 25 can also be closed, for example. By welding a lid or pressing a cap (not shown).

Die Größe der Bohrungen 24a-d und die Füllmenge des Kühlmittels 27 richten sich nach der Größe und dem Werkstoff des Kolbens 10. Durchschnittlich werden etwa. 10g bis 40g Kühlmittel 27 pro Kolben 10 benötigt. Die Kühlleistung kann über die Menge des zugegebenen Kühlmittels 27 gesteuert werden. Zweckmäßigerweise ergibt sich im Kühlkanal 23 ein Füllstand, der in etwa der halben Höhe des Kühlkanals 23 entspricht. In diesem Fall kann im Betrieb der an sich bekannte Shaker-Effekt für eine wirksame Kühlung zusätzlich genutzt werden. Für Natrium als Kühlmittel 27 mit einer Temperatur im Betrieb von 220°C ergibt sich bei einer Kühlleistung von 350kW/m2 eine maximale Oberflächentemperatur des Kolbens 10 von etwa 260°C. Zusätzlich kann die Unterseite 11a des Kolbenkopfes 11 durch Anspritzen mit Kühlöl gekühlt werden.The size of the holes 24a-d and the filling amount of the coolant 27 depend on the size and the material of the piston 10. On average, about. 10g to 40g coolant 27 per piston 10 required. The cooling capacity can be controlled via the amount of added coolant 27. Conveniently, results in the cooling passage 23, a level corresponding to approximately half the height of the cooling channel 23. In this case, during operation, the known shaker effect can additionally be used for effective cooling. For sodium as coolant 27 with a temperature in operation of 220 ° C results in a cooling capacity of 350kW / m 2 a maximum surface temperature of the piston 10 of about 260 ° C. In addition, the underside 11a of the piston head 11 can be cooled by injection with cooling oil.

Zum Befüllen der Bohrung 24a wird durch die Öffnung 25 eine Lanze eingeführt und mittels Stickstoff oder mittels eines anderen geeigneten Inertgases oder mittels trockener Luft gespült. Zur Einführung des bei Raumtemperatur festen Kühlmittels 27, bspw. Natrium und/oder Kalium wird dieses unter Schutzgas (bspw. Stickstoff, Inertgas oder trockene Luft) mittels einer Presse durch die Öffnung 25 gedrückt, so dass sich das Kühlmittel 27 drahtförmig in die Bohrung 24a bzw. den Kühlkanal 23 eindrücken lässt. Anstelle des reinen Metalls kann auch eine Legierung aus Natrium und Kalium verwendet werden, die bei Raumtemperatur bereits flüssig ist.
Ein weiteres Verfahren zum Befüllen der Bohrung 24a zeichnet sich dadurch aus, dass nach dem Spülen mit Stickstoff, Inertgas oder trockener Luft die Bohrungen 24a-d und der Kühlkanal 23 evakuiert werden und das Kühlmittel 27 im Vakuum eingebracht wird. Damit kann sich das Kühlmittel 27 leichter im Kühlkanal 23 hin und her und in den Bohrungen 24a-d hinein und hinaus bewegen, da es nicht durch vorhandenes Schutzgas behindert wird.To fill the bore 24a, a lance is inserted through the opening 25 and purged by means of nitrogen or other suitable inert gas or by means of dry air. To introduce the coolant 27, for example sodium and / or potassium, which is solid at room temperature, it is pressed under protective gas (for example nitrogen, inert gas or dry air) through the opening 25 by means of a press so that the coolant 27 is wire-shaped into the bore 24a or let the cooling channel 23 press. Instead of the pure metal, it is also possible to use an alloy of sodium and potassium which is already liquid at room temperature.
Another method for filling the bore 24a is characterized in that after flushing with nitrogen, inert gas or dry air, the bores 24a-d and the cooling channel 23 are evacuated and the coolant 27 is introduced in a vacuum. Thus, the coolant 27 can move more easily in the cooling channel 23 back and forth and in the bores 24a-d in and out, since it is not hindered by existing inert gas.

Praktischerweise hat sich gezeigt, wenn der Anteil der Verbrennungswärme, welcher während des Motorbetriebs in den Kolben abfließt, begrenzt werden soll, kann dies mit der Menge an eingefülltem Kühlmittel gesteuert werden. Es hat sich desweiteren gezeigt, dass mitunter bereits eine Füllung von 3-5% des Kühlkanalvolumens mit dem Kühlmittel ausreicht, um die Funktion des Kolbens sicherzustellen.Practically, it has been found that if the proportion of the heat of combustion flowing into the piston during engine operation is to be limited, this can be controlled by the amount of coolant introduced. It has also been shown that sometimes even a filling of 3-5% of the cooling channel volume with the coolant is sufficient to ensure the function of the piston.

Eine andere Möglichkeit, das Schutzgas aus dem Kühlkanal 23 bzw. den Bohrungen 24a-d zu entfernen, besteht darin, dass Stickstoff oder trockene Luft (d.h. im Wesentlichen eine Mischung aus Stickstoff und Sauerstoff) als Schutzgas zu verwenden und dem Kühlmittel 27 eine kleine Menge Lithium zuzusetzen, erfahrungsgemäß etwa 1,8mg bis 2,0mg Lithium pro Kubikzentimeter Gasraum (d.h. Volumen des Kühlkanal 23 plus Volumen der Bohrungen 24a-d). Während Natrium und Kalium mit Sauerstoff zu Oxiden reagieren, reagiert das Lithium mit Stickstoff zu Lithiumnitrid. Das Schutzgas wird somit praktisch vollständig als Feststoff im Kühlmittel 27 gebunden.Another possibility for removing the protective gas from the cooling channel 23 or the bores 24a-d is to use nitrogen or dry air (ie essentially a mixture of nitrogen and oxygen) as protective gas and a small amount of the coolant 27 Lithium, according to experience about 1.8mg to 2.0mg lithium per cubic centimeter gas space (ie volume of the cooling channel 23 plus volume of the holes 24a-d). While sodium and potassium react with oxygen to form oxides, the lithium reacts with nitrogen to form lithium nitride. The protective gas is thus almost completely bound as a solid in the coolant 27.

Claims (8)

  1. A piston (10) designed in the form of a box piston for an internal combustion engine, having a piston head (11) and a piston skirt (16), wherein the piston head (11) has a peripheral ring portion (15) and also a peripheral cooling channel (23) in the region of the ring portion (15), wherein the piston skirt (16) has piston bosses (17) provided with boss bores (18), which piston bosses are arranged on the underside (11 a) of the piston head (11) by means of boss connections (19), wherein the piston bosses (17) are connected to one another by means of working surfaces (21, 22), characterised in that four axial, outwardly closed bores (24a, 24b, 24c, 24d) are provided within the piston bosses (17), said bores being formed one in each of the boss connections (19), and are arranged between a working surface (21, 22) and a boss bore (18), and in that the bores (24a, 24b, 24c, 24d) open out into the cooling channel (23) in such a way that an outwardly closed cavity is formed.
  2. The piston according to claim 1, characterised in that exactly one bore (24a) has an opening (25) outwardly which is closed by means of a closure element (26).
  3. The piston according to claim 1, characterised in that the closure element (26) is pressed into the bore (24a) or is welded to the piston (10).
  4. The piston according to claim 1, characterised in that the filling (27) has a fill level up to half the height of the cooling channel (23).
  5. The piston according to claim 1, characterised in that the filling (27) has a fill level of from 3% to 5% of the volume of the cooling channel (23).
  6. The piston according to claim 1, characterised in that the filling (27) consists of a potassium-sodium alloy with 22 % by weight of sodium and 78 % by weight of potassium.
  7. The piston according to claim 1, characterised in that the filling (27) contains lithium and/or lithium nitride.
  8. The piston according to claim 1, characterised in that the filling (27) contains sodium oxides and/or potassium oxides.
EP11833594.2A 2010-12-18 2011-12-15 Piston for an internal combustion engine and method for the production thereof Not-in-force EP2652302B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010055161 2010-12-18
DE201110114105 DE102011114105A1 (en) 2010-12-18 2011-09-22 Piston for an internal combustion engine and method for its production
PCT/DE2011/002128 WO2012079566A2 (en) 2010-12-18 2011-12-15 Piston for an internal combustion engine and method for the production thereof

Publications (2)

Publication Number Publication Date
EP2652302A2 EP2652302A2 (en) 2013-10-23
EP2652302B1 true EP2652302B1 (en) 2017-04-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11833594.2A Not-in-force EP2652302B1 (en) 2010-12-18 2011-12-15 Piston for an internal combustion engine and method for the production thereof

Country Status (6)

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US (1) US8899208B2 (en)
EP (1) EP2652302B1 (en)
JP (1) JP6113075B2 (en)
CN (1) CN203655459U (en)
DE (1) DE102011114105A1 (en)
WO (1) WO2012079566A2 (en)

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Also Published As

Publication number Publication date
DE102011114105A1 (en) 2012-06-21
CN203655459U (en) 2014-06-18
EP2652302A2 (en) 2013-10-23
WO2012079566A2 (en) 2012-06-21
JP2013545927A (en) 2013-12-26
US20130312695A1 (en) 2013-11-28
US8899208B2 (en) 2014-12-02
WO2012079566A3 (en) 2012-10-04
JP6113075B2 (en) 2017-04-12

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