EP2342441B1 - Internal combustion engine piston with cooling channel said piston comprising a sealing element sealing the cooling channel - Google Patents

Internal combustion engine piston with cooling channel said piston comprising a sealing element sealing the cooling channel Download PDF

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Publication number
EP2342441B1
EP2342441B1 EP09778534.9A EP09778534A EP2342441B1 EP 2342441 B1 EP2342441 B1 EP 2342441B1 EP 09778534 A EP09778534 A EP 09778534A EP 2342441 B1 EP2342441 B1 EP 2342441B1
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EP
European Patent Office
Prior art keywords
cooling channel
piston
closure element
closing element
ring field
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.)
Active
Application number
EP09778534.9A
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German (de)
French (fr)
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EP2342441A1 (en
Inventor
Franz-Peter Allig
Wolfgang Köhler
Matthias Laqua
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KS Kolbenschmidt GmbH
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KS Kolbenschmidt GmbH
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Publication of EP2342441A1 publication Critical patent/EP2342441A1/en
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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 
    • F02F3/16—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
    • 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
    • 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
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the invention relates to a cooling channel piston having a lying behind a ring field radially encircling cooling channel, the cooling channel piston forged from a steel material and the cooling channel is introduced by machining between an upper part below the ring field and a lower part above the piston hubs and Kolben2020ften, wherein the Cooling channel extends behind the ring field in the direction of an upper side of the upper part, according to the features of the preamble of claim 1.
  • a genericdekanalkolben and a method for its preparation is known from DE 100 13 395 C1 known.
  • a piston blank is forged from a steel material, wherein the forging method has the advantage that a material structure is produced with particularly high strength properties. This is necessary to meet the strength requirements when using cooling channel pistons in modern internal combustion engines. These strength requirements result in particular from the ever-increasing combustion pressures and combustion temperatures as well as injection pressures of the fuel in the cylinder chamber of the internal combustion engine.
  • the invention is therefore based on the object to provide a cooling channel piston, which is improved compared to the cooling channel piston from the prior art, which meets in particular the required strength requirements during its operation in the cylinder chamber of the internal combustion engine.
  • the cooling channel piston above its piston bosses and piston shafts has an outwardly facing support region, wherein between the lower edge of the ring field and the support region (viewed in the direction of Kolbenhubachse) a closure element is arranged and secured, which the cooling channel after his Production closes.
  • a closure element is arranged and secured, which the cooling channel after his Production closes.
  • closure element is parallel to the Kolbenhubachse (and not transversely, as in the DE 100 13 395 C1 ).
  • DE102005037175 disclose cooling channel piston, in which the cooling channels are covered by a closure element.
  • the closure element consists of a heat-resistant plastic, in particular silicone-based.
  • the closure element either on plastic or steel material base can be formed one or more parts. This leads to a particularly high rigidity and easy installation.
  • a closure element made of a heat-resistant plastic also has the advantage that not only a single closure is possible due to the stability of the plastic, but after a certain period of operation of the piston and its removal from the engine, the plastic closure ring can be removed to the cooling channel to inspect. Thereafter, the cooling channel can be re-closed by a new closure element or even with the previously used closure element, the latter possibility advantageously brings a cost reduction.
  • the closure element is releasably or permanently connected to the lower edge of the ring field and / or to the support region.
  • This detachable connection has the advantage that the closure element can be removed and the cooling channel can be closed again with the same or another closure element.
  • the unsolvable connection has the additional advantage that the rigidity is improved, since the claimed piston crown can be supported on the piston stems during operation.
  • the non-detachable connection can be made selectively, in some areas radially encircling or full circumference.
  • the permanent connection can in a closure element made of a metal material z. B. by soldering or welding, wherein a closure element can be glued from a plastic. Bonding is an advantageous alternative even with a closure element made of a metal material for soldering or welding.
  • the closure element is releasably connected by a clamping with the lower edge of the ring field and the support region, wherein in a particularly advantageous manner, the closure element has at least one shoulder at its upper and / or lower edge, wherein the support region also has a Has at least one paragraph of the closure element corresponding paragraph.
  • the respective paragraph can also be executed in several stages, so that the closure element z. B. is releasably secured by means of a tongue and groove connection to the lower edge of the ring field and / or the support region.
  • the closure element has at least one opening, in a particularly advantageous manner distributed in the radial circumference, a plurality of openings.
  • the opening or the openings is selected so that a certain proportion of the circulating engine oil exits the cooling channel, which serves as lubrication for the piston skirt on the cylinder inner wall of the internal combustion engine.
  • the at least one opening or the plurality of openings is provided in a region in the closure element above the piston shafts of the cooling channel piston.
  • at least one transverse connection is provided between the cooling channel and a piston inner region of the cooling channel piston.
  • FIGS. 1 to 3 is denoted by 1 a cooling channel piston, which is integrally formed of a steel material and having a top part 2 with a ring field 3. At the top of the upper part 2, a combustion bowl 4 is present, but does not have to be present.
  • 5 is a piston inner region, wherein a cooling channel extends radially circumferentially behind the ring field 3 and the piston inner region 5.
  • the cooling channel piston 1 has a lower part 7 which comprises piston bosses 8 with bolt holes 9 and piston shanks 10.
  • the piston shafts 10 are present radially circumferentially only in partial areas, while the piston bosses 8 are set back relative to the outer diameter of the cooling channel piston 1.
  • the invention is not limited to types of piston, in which the piston shanks 10 are radially encircling cylindrical and form the outer region of the lower part 7.
  • At least one inlet opening 11 in the direction of the cooling channel 6, as well as a drain opening 12, for the engine oil, which is to be injected into the cooling channel 6, is present in the region of the piston hubs 8.
  • at least one transverse connection 13, preferably two transverse connections (once drain and once inlet for the engine oil) may also be present between the piston inner region 5 and the cooling channel 6.
  • the preferably in its cross-section rectangular and elongated closure element 14 is aligned parallel to the Kolbenhubachse and arranged and secured between the lower edge of the ring field 3 and the upper edge of the Abstützungs Kunststoffes.
  • the closure element 14 is at least made in two parts, so that it can be arranged and fixed in the area between the ring field 3 and Abstweilungs Scheme AB.
  • the closure element 14 insoluble with the support area AB and / or the lower edge of the ring field 3 z. B. by soldering, welding or gluing or the like, shows in a further alternative, the embodiment that the closure member 14 is arranged and fixed by a clamping fit on the cooling channel piston 1.
  • multi-level paragraphs or tongue and groove connections between Closure element 14 and lower edge Rindfeld 3 on the one hand and the upper edge Abstützungs Symposium AB on the other hand are conceivable.
  • FIGS. 4 and 5 Further structural details or the implementation of the method for introducing the cooling channel 6 in the upper part 2 of the cooling channel piston 1.
  • the closure member 14 is arranged and fastened, introduced a radially circumferential recess which extends between the support region AB and the peripheral lower edge of the ring field 3.
  • a tool W is used, which with a bow or crescent-shaped bit M Is provided.
  • This bit M of the tool W is inserted into the groove and moved due to a radial movement either of the tool W at a fixed cooling channel piston 1 or stationary tool W and relative movement to the cooling channel piston 1.
  • the cooling channel 1 can be introduced stepwise, wherein the cross section of the introduced cooling channel 6, which in FIG. 4 has shown cross-sectional shape which is approximately a kidney shape.
  • the advantage of the illustrated cross section of the cooling channel 1, which is approximately kidney-shaped, is a better stress distribution in the upper part 2 of the cooling channel piston 1 while reducing the weight of the entire cooling channel piston 1. The better stress distribution results due to the larger radii of the cross section of the cooling channel. 6 which results from the bow-shaped or sickle-shaped bit M.
  • FIG. 5 different views of the finished cooling channel piston 1 are shown, wherein it can be seen that the finished introduced cooling channel 6 is closed in the upper part 2 with the closure element 14.
  • This closure element 14 relies, as in the embodiments according to the FIGS. 1 to 3 , between the support area AB above the piston shank 10 and the radially encircling lower edge of the ring field 2 from.
  • a plurality of cross connections 13 are provided in a star shape between the piston inner region 5 and the cooling channel 6.

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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 Erfindung betrifft einen Kühlkanalkolben, der einen hinter einem Ringfeld liegenden radial umlaufenden Kühlkanal aufweist, wobei der Kühlkanalkolben aus einem Stahlwerkstoff geschmiedet und der Kühlkanal mittels spanabhebender Bearbeitung zwischen einem Oberteil unterhalb der Ringfeldes und einem Unterteil oberhalb von Kolbennaben und Kolbenschäften eingebracht ist, wobei sich der Kühlkanal hinter dem Ringfeld in Richtung einer Oberseite des Oberteils erstreckt, gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a cooling channel piston having a lying behind a ring field radially encircling cooling channel, the cooling channel piston forged from a steel material and the cooling channel is introduced by machining between an upper part below the ring field and a lower part above the piston hubs and Kolbenschäften, wherein the Cooling channel extends behind the ring field in the direction of an upper side of the upper part, according to the features of the preamble of claim 1.

Ein gattungsgemäßer Kühlkanalkolben und ein Verfahren zu seiner Herstellung ist aus der DE 100 13 395 C1 bekannt. Bei diesem Kühlkanalkolben wird ein Kolbenrohling aus einem Stahlwerkstoff geschmiedet, wobei das Schmiedeverfahren den Vorteil hat, dass ein Materialgefüge mit besonders hohen Festigkeitseigenschaften entsteht. Dies ist erforderlich, um die Festigkeitsanforderungen beim Einsatz von Kühlkanalkolben in modernen Brennkraftmaschinen zu erfüllen. Diese Festigkeitsanforderungen resultieren insbesondere aus den immer weiter steigenden Verbrennungsdrücken und Verbrennungstemperaturen sowie Einspritzdrücken des Kraftstoffes in den Zylinderraum der Brennkraftmaschine.A generic Kühlkanalkolben and a method for its preparation is known from DE 100 13 395 C1 known. In this cooling channel piston, a piston blank is forged from a steel material, wherein the forging method has the advantage that a material structure is produced with particularly high strength properties. This is necessary to meet the strength requirements when using cooling channel pistons in modern internal combustion engines. These strength requirements result in particular from the ever-increasing combustion pressures and combustion temperatures as well as injection pressures of the fuel in the cylinder chamber of the internal combustion engine.

Nachdem der Kolbenrohling geschmiedet worden ist und dabei schon Kolbenschäfte und Kolbennaben mit geschmiedet worden sind, wird zwischen einem Oberteil und einem Unterteil des Kolbens mittels spanabhebender Bearbeitung in mehreren Schritten der Kühlkanal eingestochen. Bei dem Verfahren der DE 100 13 395 C1 ist es von besonderem Vorteil, dass der Kühlkanal auf eine bestimmte Art und Weise eingestochen wird, sodass sich der Kühlkanal hinter dem Ringfeld in Richtung einer Oberseite des Oberteiles des Kühlkanalkolbens erstreckt, um einerseits das Volumen des Kühlkanales zu vergrößern, andererseits die Bauhöhe des gesamten Kolbens möglichst gering zu halten. Um die Funktion des Kühlkanales, nämlich die Zirkulation von einem Kühlmedium wie Motoröl in dem Kühlkanal zu realisieren, ist es noch erforderlich, dass der Kühlkanal von einem Verschlusselement verschlossen wird. Aufgrund des Designs des Kühlkanalkolbens der DE 100 13 395 C1 ist es nur möglich, das Verschlusselement in einer Ebene parallel zu einer Ebene der Oberfläche des Kolbenbodens zu verschließen. Das allerdings bedeutet, dass der radial eingestochene Spalt zwischen dem Unterteil und dem Oberteil des Kühlkanalkolbens verbleibt und eine Schwächung des Kolbens im Betrieb im Zylinderraum der Brennkraftmaschine schwächt.After the piston blank has been forged and thereby piston shafts and piston hubs have been forged with, is between an upper part and a lower part of the piston by means of machining in several Steps of the cooling channel inserted. In the process of DE 100 13 395 C1 it is of particular advantage that the cooling channel is pierced in a certain way, so that the cooling channel extends behind the ring field in the direction of an upper side of the upper part of the cooling channel piston, on the one hand to increase the volume of the cooling channel, on the other hand, the overall height of the entire piston keep as low as possible. In order to realize the function of the cooling channel, namely the circulation of a cooling medium such as engine oil in the cooling channel, it is still necessary that the cooling channel is closed by a closure element. Due to the design of the cooling channel piston of the DE 100 13 395 C1 it is only possible to close the closure element in a plane parallel to a plane of the surface of the piston crown. However, this means that the radially inserted gap between the lower part and the upper part of the cooling channel piston remains and weakens a weakening of the piston during operation in the cylinder chamber of the internal combustion engine.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Kühlkanalkolben bereitzustellen, der gegenüber dem Kühlkanalkolben aus dem Stand der Technik verbessert ist, der insbesondere die erforderlichen Festigkeitsanforderungen während seines Betriebes im Zylinderraum der Brennkraftmaschine erfüllt.The invention is therefore based on the object to provide a cooling channel piston, which is improved compared to the cooling channel piston from the prior art, which meets in particular the required strength requirements during its operation in the cylinder chamber of the internal combustion engine.

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

Zur Lösung dieser Aufgabe ist vorgesehen, dass der Kühlkanalkolben oberhalb seiner Kolbennaben und Kolbenschäfte einen nach außen weisenden Abstützungsbereich aufweist, wobei zwischen der Unterkante des Ringfeldes und dem Abstützungsbereich (in Richtung der Kolbenhubachse betrachtet) ein Verschlusselement angeordnet und befestigt ist, welches den Kühlkanal nach seiner Herstellung verschließt. Damit wird einerseits ein großes effektives Kühlkanalvolumen realisiert (insbesondere dann, wenn der Kühlkanal mittels des Verfahrens gemäß der DE 100 13 395 C1 eingebracht worden ist) und andererseits die erforderliche Festigkeit erzielt, da sich aufgrund der Anordnung des Verschlusselementes das Oberteil des Kühlkanalkolbens, welches infolge der Verbrennungsdrücke besonders beansprucht ist, über das Verschlusselement auf den Kolbenschäften abstützen kann. Zu diesem Zweck ist das Verschlusselement parallel zu der Kolbenhubachse (und nicht quer, wie bei der DE 100 13 395 C1 ) ausgerichtet. Auch DE102005037175 , DE10346822 und DE102006045728 offenbaren Kühlkanalkolben, bei denen die Kühlkanäle mittels eines Verschlusselements abgedeckt sind.To solve this problem, it is provided that the cooling channel piston above its piston bosses and piston shafts has an outwardly facing support region, wherein between the lower edge of the ring field and the support region (viewed in the direction of Kolbenhubachse) a closure element is arranged and secured, which the cooling channel after his Production closes. This is on the one hand a great effective Cooling channel volume realized (especially when the cooling channel by means of the method according to the DE 100 13 395 C1 has been introduced) and on the other hand achieved the required strength, since due to the arrangement of the closure element, the upper part of the cooling channel piston, which is particularly stressed as a result of combustion pressures, can be supported on the Kolbenschäften via the closure element. For this purpose, the closure element is parallel to the Kolbenhubachse (and not transversely, as in the DE 100 13 395 C1 ). Also DE102005037175 . DE10346822 and DE102006045728 disclose cooling channel piston, in which the cooling channels are covered by a closure element.

In Weiterbildung der Erfindung besteht das Verschlusselement aus einem hitzebeständigen Kunststoff, insbesondere auf Silikonbasis. Das Verschlusselement, entweder auf Kunststoff- oder Stahlwerkstoff-Basis kann ein- oder mehrteilig ausgebildet sein. Dies führt zu einer besonders hohen Steifigkeit und einfachen Montage. Ein Verschlusselement aus einem wärmeresistenten Kunststoff hat darüber hinaus den Vorteil, dass infolge der Stabilität des Kunststoffes nicht nur ein einmaliger Verschluss möglich ist, sondern nach einer gewissen Betriebsdauer des Kolbens und seinem Ausbau aus der Brennkraftmaschine der Kunststoff-Verschlussring entfernt werden kann, um den Kühlkanal zu inspizieren. Danach kann der Kühlkanal von einem neuen Verschlusselement oder schon mit dem bisher verwendeten Verschlusselement erneut verschlossen werden, wobei letztgenannt Möglichkeit in vorteilhafter Weise eine Kostenreduzierung mit sich bringt.In a further development of the invention, the closure element consists of a heat-resistant plastic, in particular silicone-based. The closure element, either on plastic or steel material base can be formed one or more parts. This leads to a particularly high rigidity and easy installation. A closure element made of a heat-resistant plastic also has the advantage that not only a single closure is possible due to the stability of the plastic, but after a certain period of operation of the piston and its removal from the engine, the plastic closure ring can be removed to the cooling channel to inspect. Thereafter, the cooling channel can be re-closed by a new closure element or even with the previously used closure element, the latter possibility advantageously brings a cost reduction.

In Weiterbildung der Erfindung ist das Verschlusselement lösbar oder unlösbar mit der Unterkante des Ringfeldes und/oder mit dem Abstützungsbereich verbunden. Diese lösbare Verbindung hat den Vorteil, dass das Verschlusselement entfernt und der Kühlkanal mit dem gleichen oder einem anderen Verschlusselement erneut verschlossen werden kann. Die unlösbare Verbindung hat darüber hinaus den Vorteil, dass die Steifigkeit verbessert wird, da sich der beanspruchte Kolbenboden auf den Kolbenschäften im Betrieb abstützen kann. Die unlösbare Verbindung kann punktuell, in Teilbereichen radial umlaufend oder vollumfänglich erfolgen. Von besonderem Vorteil ist die unlösbare Verbindung des Verschlusselementes mit seinen Oberkanten in Richtung des Ringfeldes sowie in Richtung des Abstützungsbereiches und dabei weiterhin von Vorteil in ihrem gesamten radialen Umlauf. Die unlösbare Verbindung kann bei einem Verschlusselement aus einem Metallwerkstoff z. B. durch Verlöten oder Verschweißen erfolgen, wobei ein Verschlusselement aus einem Kunststoff verklebt werden kann. Verkleben ist auch bei einem Verschlusselement aus einem Metallwerkstoff zum Verlöten oder Verschweißen eine vorteilhafte Alternative. Alternativ dazu ist es denkbar, dass das Verschlusselement durch eine Klemmung lösbar mit der Unterkante des Ringfeldes und dem Abstützungsbereich verbunden wird, wobei in besonders vorteilhafter Weise das Verschlusselement an seiner Ober- und/oder Unterkante zumindest einen Absatz aufweist, wobei der Abstützungsbereich ebenfalls einen den zumindest einen Absatz des Verschlusselementes entsprechenden Absatz aufweist. Der jeweilige Absatz kann auch mehrstufig ausgeführt sein, sodass das Verschlusselement z. B. mittels einer Feder-Nut-Verbindung an der Unterkante des Ringfeldes und/oder dem Abstützungsbereich lösbar befestigt wird.In a further development of the invention, the closure element is releasably or permanently connected to the lower edge of the ring field and / or to the support region. This detachable connection has the advantage that the closure element can be removed and the cooling channel can be closed again with the same or another closure element. The unsolvable connection has the additional advantage that the rigidity is improved, since the claimed piston crown can be supported on the piston stems during operation. The non-detachable connection can be made selectively, in some areas radially encircling or full circumference. Of particular advantage is the permanent connection of the closure element with its upper edges in the direction of the ring field and in the direction of the support region and thereby continue to be advantageous in their entire radial circulation. The permanent connection can in a closure element made of a metal material z. B. by soldering or welding, wherein a closure element can be glued from a plastic. Bonding is an advantageous alternative even with a closure element made of a metal material for soldering or welding. Alternatively, it is conceivable that the closure element is releasably connected by a clamping with the lower edge of the ring field and the support region, wherein in a particularly advantageous manner, the closure element has at least one shoulder at its upper and / or lower edge, wherein the support region also has a Has at least one paragraph of the closure element corresponding paragraph. The respective paragraph can also be executed in several stages, so that the closure element z. B. is releasably secured by means of a tongue and groove connection to the lower edge of the ring field and / or the support region.

In Weiterbildung der Erfindung ist vorgesehen, dass das Verschlusselement zumindest eine Öffnung, in besonderes vorteilhafter Weise in radialem Umfang verteilt mehrere Öffnungen aufweist. Dabei ist die Öffnung bzw. sind die Öffnungen so gewählt, dass von dem zirkulierenden Motoröl ein gewisser Anteil aus dem Kühlkanal austritt, der als Schmierung für den Kolbenschaft an der Zylinderinnenwand der Brennkraftmaschine dient. Zu diesem Zweck ist die zumindest eine Öffnung bzw. sind die mehreren Öffnungen in einem Bereich in dem Verschlusselement oberhalb der Kolbenschäfte des Kühlkanalkolbens vorgesehen. In Weiterbildung der Erfindung ist zwischen dem Kühlkanal und einem Kolbeninnenbereich des Kühlkanalkolbens zumindest eine Querverbindung vorgesehen. Über diese zumindest eine Querverbindung, in besonders vorteilhafter Weise aufgrund mehrerer Querverbindungen, ist es möglich, dass das Motoröl, welches in den Kolbeninnenbereich eingespritzt wird, über die zumindest eine Querverbindung in den Kühlkanal eindringt, dort zirkuliert und die zumindest weitere Querverbindung wieder austritt und dabei Wärme abführt, um den Kolbenboden zu kühlen.In a development of the invention, it is provided that the closure element has at least one opening, in a particularly advantageous manner distributed in the radial circumference, a plurality of openings. In this case, the opening or the openings is selected so that a certain proportion of the circulating engine oil exits the cooling channel, which serves as lubrication for the piston skirt on the cylinder inner wall of the internal combustion engine. For this purpose, the at least one opening or the plurality of openings is provided in a region in the closure element above the piston shafts of the cooling channel piston. In a further development of the invention, at least one transverse connection is provided between the cooling channel and a piston inner region of the cooling channel piston. About this at least one cross-connection, in a particularly advantageous manner due to multiple cross-connections, it is possible that the engine oil, which is injected into the piston inner region, penetrates via the at least one cross-connection in the cooling channel, there circulated and the at least further cross-connection exits again and thereby Dissipates heat to cool the piston crown.

Ein Ausführungsbeispiel der Erfindung ist anhand von verschiedenen Schnitten eines Kühlkanalkolbens im Folgenden erläutert und anhand der Figuren 1 bis 3 dargestellt.An embodiment of the invention is explained below with reference to various sections of a cooling channel piston and with reference to FIG FIGS. 1 to 3 shown.

In Figuren 1 bis 3 ist mit 1 ein Kühlkanalkolben bezeichnet, der einteilig aus einem Stahlwerkstoff ausgebildet ist und ein Oberteil 2 mit einem Ringfeld 3 aufweist. An der Oberseite des Oberteiles 2 ist eine Brennraummulde 4 vorhanden, muss aber nicht vorhanden sein. Mit 5 ist ein Kolbeninnenbereich bezeichnet, wobei ein Kühlkanal sich radial umlaufend hinter dem Ringfeld 3 und dem Kolbeninnenbereich 5 erstreckt.In FIGS. 1 to 3 is denoted by 1 a cooling channel piston, which is integrally formed of a steel material and having a top part 2 with a ring field 3. At the top of the upper part 2, a combustion bowl 4 is present, but does not have to be present. 5 is a piston inner region, wherein a cooling channel extends radially circumferentially behind the ring field 3 and the piston inner region 5.

Weiterhin weist der Kühlkanalkolben 1 ein Unterteil 7 auf, das Kolbennaben 8 mit Bolzenbohrungen 9 und Kolbenschäfte 10 umfasst. Bei dem in den Figuren 1 bis 3 dargestellten Kühlkanalkolben 1 sind die Kolbenschäfte 10 radial umlaufend nur in Teilbereichen vorhanden, während die Kolbennaben 8 gegenüber dem äußeren Durchmesser des Kühlkanalkolbens 1 zurückgesetzt sind. Die Erfindung ist jedoch nicht auf Bauarten von Kolben beschränkt, bei denen die Kolbenschäfte 10 radial umlaufend zylinderförmig ausgebildet sind und den Außenbereich des Unterteiles 7 bilden.Furthermore, the cooling channel piston 1 has a lower part 7 which comprises piston bosses 8 with bolt holes 9 and piston shanks 10. In the in the FIGS. 1 to 3 shown cooling channel piston 1, the piston shafts 10 are present radially circumferentially only in partial areas, while the piston bosses 8 are set back relative to the outer diameter of the cooling channel piston 1. However, the invention is not limited to types of piston, in which the piston shanks 10 are radially encircling cylindrical and form the outer region of the lower part 7.

Es ist möglich, dass im Bereich der Kolbennaben 8 mindest eine Zulauföffnung 11 in Richtung des Kühlkanales 6, genauso wie eine Ablauföffnung 12, für das Motoröl, welches in den Kühlkanal 6 eingespritzt werden soll, vorhanden ist. Alternativ oder ergänzend zu den Öffnungen 11, 12 kann auch zumindest eine Querverbindung 13, vorzugsweise zwei Querverbindungen (einmal Ablauf und einmal Zulauf für das Motoröl) zwischen dem Kolbeninnenbereich 5 und dem Kühlkanal 6 vorhanden sein.It is possible that at least one inlet opening 11 in the direction of the cooling channel 6, as well as a drain opening 12, for the engine oil, which is to be injected into the cooling channel 6, is present in the region of the piston hubs 8. As an alternative or in addition to the openings 11, 12, at least one transverse connection 13, preferably two transverse connections (once drain and once inlet for the engine oil) may also be present between the piston inner region 5 and the cooling channel 6.

Mit AB ist der nach außen weisende Abstützungsbereich für eine Verschlusselement 14 bezeichnet, wobei der Abstützungsbereich AB oberhalb der Kolbennaben 8 (Figur 1) bzw. oberhalb der Kolbenschäfte 10 (Figur 3) vorgesehen ist. In erfindungsgemäßer Weise ist das vorzugsweise in seinem Querschnitt rechteckförmige und länglich ausgebildete Verschlusselement 14 parallel zu der Kolbenhubachse ausgerichtet und zwischen der Unterkante des Ringfeldes 3 und der Oberkante des Abstützungsbereiches in AB angeordnet und befestigt. Bei dem Ausführungsbeispiel des Kühlkanalkolbens 1, der in den Figuren 1 bis 3 gezeigt ist, ist das Verschlusselement 14 zumindest zweiteilig ausgeführt, damit es in dem Bereich zwischen Ringfeld 3 und Abstützungsbereich AB angeordnet und befestigt werden kann.AB denotes the outwardly directed support region for a closure element 14, wherein the support region AB above the piston hubs 8 (FIG. FIG. 1 ) or above the piston shanks 10 (FIG. FIG. 3 ) is provided. In accordance with the invention, the preferably in its cross-section rectangular and elongated closure element 14 is aligned parallel to the Kolbenhubachse and arranged and secured between the lower edge of the ring field 3 and the upper edge of the Abstützungsbereiches. In the embodiment of the cooling channel piston 1, which in the FIGS. 1 to 3 is shown, the closure element 14 is at least made in two parts, so that it can be arranged and fixed in the area between the ring field 3 and Abstützungsbereich AB.

Während in einer ersten Alternative das Verschlusselement 14 unlösbar mit dem Abstützungsbereich AB und/oder der Unterkante des Ringfeldes 3 z. B. durch Verlöten, Verschweißen oder Verkleben oder dergleichen verbunden werden kann, zeigt in einer weiteren Alternative das Ausführungsbeispiel, dass das Verschlusselement 14 durch einen Klemmsitz an dem Kühlkanalkolben 1 angeordnet und befestigt wird. Hierzu weist das Verschlusselement 14 an seiner Ober- und Unterkante einen einstufigen Absatz auf, wobei der Abstützungsbereich AB ebenfalls einen zu den Absätzen des Verschlusselementes 14 entsprechenden Absatz aufweist. Auch mehrstufige Absätze oder Feder-Nut-Verbindungen zwischen Verschlusselement 14 und Unterkante Rindfeld 3 einerseits bzw. Oberkante Abstützungsbereich AB andererseits sind denkbar.While in a first alternative, the closure element 14 insoluble with the support area AB and / or the lower edge of the ring field 3 z. B. by soldering, welding or gluing or the like, shows in a further alternative, the embodiment that the closure member 14 is arranged and fixed by a clamping fit on the cooling channel piston 1. For this purpose, the closure element 14 on its upper and lower edge on a single-step paragraph, wherein the support region AB also has a corresponding to the paragraphs of the closure element 14 paragraph. Also multi-level paragraphs or tongue and groove connections between Closure element 14 and lower edge Rindfeld 3 on the one hand and the upper edge Abstützungsbereich AB on the other hand are conceivable.

Analog zu den Ausgestaltungen des Kühlkanalkolbens 1, wie er in den Figuren 1 bis 3 gezeigt und dort beschrieben ist, zeigen die Figuren 4 und 5 weitere konstruktive Details beziehungsweise die Durchführung des Verfahrens zum Einbringen des Kühlkanales 6 in das Oberteil 2 des Kühlkanalkolbens 1. Wie auch schon bei den Kühlkanalkolben 1 gemäß der Figuren 1 bis 3 wird dort, wo später das Verschlusselement 14 angeordnet und befestigt wird, ein radial umlaufender Einstich eingebracht, der sich erstreckt zwischen dem Abstützungsbereich AB und der umlaufenden Unterkante des Ringfeldes 3. Dazu wird ein Werkzeug W verwendet, das mit einem bogen- beziehungsweise sichelförmigen Meißel M ausgestattet ist. Dieser Meißel M des Werkzeuges W wird in den Einstich eingeführt und infolge einer Radialbewegung entweder des Werkzeuges W bei feststehendem Kühlkanalkolben 1 oder bei feststehendem Werkzeug W und Relativbewegung dazu des Kühlkanalkolbens 1 bewegt. Dadurch kann aufgrund der Radialbewegung entweder des Meißels M oder des Kühlkanalkolbens 1 der Kühlkanal 1 schrittweise eingebracht werden, wobei der Querschnitt des eingebrachten Kühlkanales 6, die in Figur 4 gezeigte Querschnittsform aufweist, die in etwa eine Nierenform ist. Der Vorteil des dargestellten Querschnittes des Kühlkanales 1, der in etwa nierenförmig ist, ist eine bessere Spannungsverteilung in dem Oberteil 2 des Kühlkanalkolbens 1 bei gleichzeitiger Herabsetzung des Gewichtes des gesamten Kühlkanalkolbens 1. Die bessere Spannungsverteilung ergibt sich infolge der größeren Radien des Querschnittes des Kühlkanales 6, der aus dem bogen- beziehungsweise sichelförmigen Meißel M resultiert.Analogous to the embodiments of the cooling channel piston 1, as in the FIGS. 1 to 3 shown and described there, the show FIGS. 4 and 5 Further structural details or the implementation of the method for introducing the cooling channel 6 in the upper part 2 of the cooling channel piston 1. As with the cooling channel piston 1 according to the FIGS. 1 to 3 is where later the closure member 14 is arranged and fastened, introduced a radially circumferential recess which extends between the support region AB and the peripheral lower edge of the ring field 3. For this purpose, a tool W is used, which with a bow or crescent-shaped bit M Is provided. This bit M of the tool W is inserted into the groove and moved due to a radial movement either of the tool W at a fixed cooling channel piston 1 or stationary tool W and relative movement to the cooling channel piston 1. As a result, due to the radial movement of either the bit M or the cooling channel piston 1, the cooling channel 1 can be introduced stepwise, wherein the cross section of the introduced cooling channel 6, which in FIG. 4 has shown cross-sectional shape which is approximately a kidney shape. The advantage of the illustrated cross section of the cooling channel 1, which is approximately kidney-shaped, is a better stress distribution in the upper part 2 of the cooling channel piston 1 while reducing the weight of the entire cooling channel piston 1. The better stress distribution results due to the larger radii of the cross section of the cooling channel. 6 which results from the bow-shaped or sickle-shaped bit M.

In Figur 5 sind verschiedene Ansichten des fertig bearbeiteten Kühlkanalkolbens 1 gezeigt, wobei erkennbar ist, dass der fertig eingebrachte Kühlkanal 6 in das Oberteil 2 mit dem Verschlusselement 14 verschlossen wird. Dieses Verschlusselement 14 stützt sich, wie schon bei den Ausführungsbeispielen gemäß der Figuren 1 bis 3, zwischen dem Abstützungsbereich AB oberhalb der Kolbenschäfte 10 und der radial umlaufenden Unterkante des Ringfeldes 2 ab. Außerdem sind sternförmig mehrere Querverbindungen 13 zwischen dem Kolbeninnenbereich 5 und dem Kühlkanal 6 vorhanden.In FIG. 5 different views of the finished cooling channel piston 1 are shown, wherein it can be seen that the finished introduced cooling channel 6 is closed in the upper part 2 with the closure element 14. This closure element 14 relies, as in the embodiments according to the FIGS. 1 to 3 , between the support area AB above the piston shank 10 and the radially encircling lower edge of the ring field 2 from. In addition, a plurality of cross connections 13 are provided in a star shape between the piston inner region 5 and the cooling channel 6.

Die in den Figuren 4 und 5 gezeigten Bemaßungen beziehen sich auf die Einheit "Millimeter".The in the FIGS. 4 and 5 dimensions shown refer to the unit "millimeters".

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1.1.
KühlkanalkolbenCooling channel piston
2.Second
Oberteiltop
3.Third
Ringfeldring box
4.4th
BrennraummuldeCombustion bowl
5.5th
KolbeninnenbereichKolb indoors
6.6th
Kühlkanalcooling channel
7.7th
Unterteillower part
8.8th.
Kolbennabenpin bosses
9.9th
Bolzenbohrungpin bore
10.10th
Kolbenschäftepiston skirts
11.11th
Zulauföffnunginlet opening
12.12th
Ablauföffnungdrain hole
13.13th
Querverbindungcross connection
14.14th
Verschlusselementclosure element
ABFROM
Abstützungsbereichsupport area

Claims (7)

  1. Cooling channel piston (1) which has a radially circumferential cooling channel (6) located behind a ring field (3), the cooling channel piston (1) being forged from a steel material and the cooling channel (6) being worked in by machining between an upper part (2) below the ring field (3) and a lower part (7) above the piston bosses (9) and the piston skirts (10), the cooling channel (6) extending behind the ring field (3) in the direction of an upper face of the upper part (2), and the cooling channel piston (1) having above its piston bosses (9) and piston skirts (10) an outwardly oriented support region (AB), characterized in that a closing element (14), which is aligned parallel to the piston stroke axis and closes the cooling channel (6) after the production thereof, is arranged and fastened between the lower edge of the ring field (3) and the support region (AB).
  2. Cooling channel piston (1) according to Claim 1, characterized in that the closing element (14) consists of a heat-resistant plastics material.
  3. Cooling channel piston (1) according to Claim 1 or 2, characterized in that the closing element (14) has a unitary or multi-part configuration.
  4. Cooling channel piston (1) according to any one of Claims 1 to 3, characterized in that the closing element (14) has at least one shoulder on its upper and/or lower edge, the support region (AB) likewise having a shoulder corresponding to the at least one shoulder of the closing element (14).
  5. Cooling channel piston (1) according to any one of the preceding claims, characterized in that the closing element (14) is connected releasably or non-releasably to the lower edge of the ring field (3) and/or to the support region (AB).
  6. Cooling channel piston (1) according to any one of the preceding claims, characterized in that the closing element (14) has at least one opening, preferably a plurality of openings.
  7. Cooling channel piston (1) according to any one of the preceding claims, characterized in that at least one transverse connection (13) is provided between the cooling channel (6) and a piston inner region (5) of the cooling channel piston (1).
EP09778534.9A 2008-11-04 2009-09-15 Internal combustion engine piston with cooling channel said piston comprising a sealing element sealing the cooling channel Active EP2342441B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008055848A DE102008055848A1 (en) 2008-11-04 2008-11-04 Cooling channel piston of an internal combustion engine with a closure element which closes the cooling channel
PCT/EP2009/006671 WO2010051878A1 (en) 2008-11-04 2009-09-15 Internal combustion engine piston with cooling channel said piston comprising a sealing element sealing the cooling channel

Publications (2)

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EP2342441A1 EP2342441A1 (en) 2011-07-13
EP2342441B1 true EP2342441B1 (en) 2018-11-14

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EP (1) EP2342441B1 (en)
JP (1) JP2012507651A (en)
KR (1) KR20110094273A (en)
DE (1) DE102008055848A1 (en)
WO (1) WO2010051878A1 (en)

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US8925511B2 (en) 2015-01-06
JP2012507651A (en) 2012-03-29
US20110265744A1 (en) 2011-11-03
WO2010051878A1 (en) 2010-05-14
EP2342441A1 (en) 2011-07-13
DE102008055848A1 (en) 2010-05-06
KR20110094273A (en) 2011-08-23

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