EP1778964A1 - Lightweight piston comprising heat pipes - Google Patents

Lightweight piston comprising heat pipes

Info

Publication number
EP1778964A1
EP1778964A1 EP05774022A EP05774022A EP1778964A1 EP 1778964 A1 EP1778964 A1 EP 1778964A1 EP 05774022 A EP05774022 A EP 05774022A EP 05774022 A EP05774022 A EP 05774022A EP 1778964 A1 EP1778964 A1 EP 1778964A1
Authority
EP
European Patent Office
Prior art keywords
piston
condenser
pipe
heat pipes
heat
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
EP05774022A
Other languages
German (de)
French (fr)
Other versions
EP1778964B1 (en
Inventor
Peter Heidrich
Roland Lochmann
Klaus Keller
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP1778964A1 publication Critical patent/EP1778964A1/en
Application granted granted Critical
Publication of EP1778964B1 publication Critical patent/EP1778964B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02F3/18—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
    • 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 light metal piston with heat pipes, with a combustion bowl of suitable bottom thickness, a ring portion, piston skirt and piston bosses for receiving a piston pin and with a plurality of sealed heat pipes provided with evaporator and condenser side, liquid-filled heat pipes circumferentially in arranged close to the ring portion ver ⁇ and aligned axially to the piston axis
  • US Pat. No. 5,454,351 discloses a light metal piston for an internal combustion engine which uses so-called heat pipes to remove heat from the hot piston regions.
  • the existing copper heat pipes are circumferentially equally distributed holes that are introduced in the crankshaft side piston crown area, inserted or poured, the holes extend to the height of the ring section in the area of the piston bosses War ⁇ merohre are light bent in order to allow the assembly of the piston pin in the Kol ⁇ ben
  • the known manner of operation of the heat pipes consists in the evaporation of the liquid located in the heat pipe on the "hot" side - evaporator side - by absorbing the heat of the area to be cooled
  • the invention has for its object to further design a light metal piston of the type mentioned above, that in simplifying the Kolbenkon ⁇ construction improved heat dissipation from the heat-loaded piston areas achieved and thus the occurrence of thermal stresses is prevented.
  • the evaporator side are formed by short pipe sections, which are Brennstrahlausdistructure in the bottom thickness to the piston crown and connected by means of a piston bottom parallel to the composite heat pipe.
  • At least two pipe sections acting as a condenser side are also coupled to the composite heat pipe in such a way that a circulating closed process circulation of the cooling liquid between the evaporator side, the composite heat pipe and the condenser side of the heat pipes is realized by a pipe connection provided with a ribbing at its condenser-side ends.
  • the pipe connection between the condenser side Rohrabschnit ⁇ th is formed such that between top dead center and bottom dead center of the light metal piston, the rib is permanently applied to a crankshaft sidedeöl- jet of an oil nozzle of the engine, advantageously an effective and faster heat removal at the condenser end of the heat pipe.
  • the composite heat pipe running parallel to the piston crown also ensures a uniform temperature distribution along the edge of the piston bowl, as a result of which crack formation on the piston head and bowl edge of the combustion bowl due to thermal stresses is effectively prevented.
  • Fig. 1 shows a first embodiment of the cooling system according to the invention in one
  • FIG. 2 shows a second embodiment of the cooling system according to the invention in one
  • Fig. 3 is a perspective view of a light metal piston with integrated
  • Cooling system according to FIG. 1.
  • a cooling system 20 which constitutes a closed cooling circuit, is formed from heat pipes - so-called heat pipes 6 - with a plurality of evaporator sides 6a and at least two condenser sides 6b, which are connected via a composite heat pipe 7.
  • a pipe joint 8 At the condenser-side end 6c of the heat pipes 6b, there is provided a pipe joint 8 having an outer rib 9 disposed thereon through which the condenser-side ends 6c of the two heat pipes 6b are coupled.
  • additional ribs can also be attached to the condenser sides 6b of the heat pipes 6, which ribs likewise consist of aluminum for mass reduction.
  • the aforementioneddenikan ⁇ order preferably consists of copper tubes or may also consist of aluminum tubes filled with heat transfer oil or provided with antifreeze additive water as a cooling liquid.
  • the geometric dimensions of the cooling system 20 allow their use in aluminum pistons without significant change in the required high component strength.
  • the cooling arrangement is inserted into a casting mold for producing an aluminum light metal piston 10, in order subsequently to produce the piston by a known casting method.
  • the composite heat pipe 7, including the evaporator side 6a of the heat pipes 6, is realized by means of a salt core inserted into the casting mold, wherein at least 2 of used three support sleeves for the salt core serve as connection for the condenser-side heat pipes 6b.
  • the structure shown in FIG. 1 and FIG. 2 is formed in the light metal piston without condenser side 6b and pipe connection 8 of the heat pipes 6, which after finishing the light metal piston 10 are inserted into the corresponding openings of the composite heat pipe 7 and then soldered or glued.
  • the evacuation and filling of the cooling system 20 takes place via a bore introduced at the condenser end, which is hermetically closed after being filled with coolant.
  • the cooling liquid in particular water, must be degassed before filling under vacuum at a pressure of 10 "4 to 10 '5 bar in order to prevent cavitation as a result of piston movement in the internal combustion engine , which can lead to imploding gas bubbles with concomitant cavitation,
  • the expediently the cooling system is filled with cooling liquid at most up to half of its volume.
  • Fig. 2 shows another embodiment of the cooling system 20 according to the invention, in which two further capacitor sides 6b are introduced into the cooling system whose circumferential distribution in the light metal piston takes place such that two are arranged on the pressure and counter-pressure side.
  • the arrow NB indicates the course of the hub bore.
  • the evaporator side 6a of the heat pipes are arranged distributed on the circumference of the composite heat pipe 7 in such a way that they correspond to the distribution of the impingement of the combustion beams from the internal combustion engine.
  • the evaporator sides 6a formed by short pipe sections are arranged in the bottom thickness 1 1 and directed towards the piston head 1 towards the combustion jet.
  • the composite heat pipe 7 running parallel to the piston head 1 connects the evaporator side 6a and at least two pipe sections acting as the condenser side 6b, wherein the at least two pipe sections acting as the condenser side 6a are arranged at a distance from the piston shank 4.

Abstract

The invention relates to a lightweight piston (10) comprising heat pipes. The aim of the invention is to simplify the structure of such a piston while at the same time allowing for an improved heat dissipation from the piston areas subject to heat load while avoiding thermal stress. For this purpose, a plurality of liquid-filled heat pipes (6) each having an evaporator (6a) and a condenser end (6b) is used, whereby the evaporator end is configured by short pipe sections that are oriented in the thickness at bottom towards the piston head and towards the focal point and that are interlinked by means of a composite heat pipe (7) extending in parallel to the piston head. At least two pipe sections functioning as the condenser end (6b) are coupled with the composite heat pipe (7) in such a manner as to configure, by way of a pipe connection (8) arranged on the condenser ends (7a), a closed coolant cycle between the evaporator end, composite heat pipe and condenser end of the heat pipes (6).

Description

Leichtmetallkolben mit Wärmerohren Light metal piston with heat pipes
Die Erfindung betrifft einen Leichtmetallkolben mit Wärmerohren, mit einer im Kol¬ benboden angeordneten Verbrennungsmulde geeigneter Bodendicke, einer Ring- partie, Kolbenschaft und Kolbennaben zur Aufnahme eines Kolbenbolzens sowie mit einer Vielzahl verschlossener, mit Verdampfer- und Kondensatorseite versehenen, flussigkeitsgefullten Wärmerohren, die umfangsseitig in der Nahe der Ringpartie ver¬ teilt angeordnet und axial zur Kolbenachse ausgerichtet sindThe invention relates to a light metal piston with heat pipes, with a combustion bowl of suitable bottom thickness, a ring portion, piston skirt and piston bosses for receiving a piston pin and with a plurality of sealed heat pipes provided with evaporator and condenser side, liquid-filled heat pipes circumferentially in arranged close to the ring portion ver¬ and aligned axially to the piston axis
Aus der US 5,454,351 ist ein Leichtmetallkolben für einen Verbrennungsmotor bekannt, der zur Ableitung von Warme von den heißen Kolbenbereichen sogenannte Heat Pipes, also Warmerohre, verwendet, die luft- und druckdicht verschlossen eine leicht verdampfende Kuhlflussigkeit, wie bevorzugt Wasser oder aber auch Ammo¬ niak, Glycol oder ähnliches, enthalt Die aus Kupfer bestehenden Warmerohre sind in umfangsseitig gleichverteilte Bohrungen, die im kurbelwellenseitigen Kolbenboden- bereich eingebracht sind, eingesetzt bzw eingegossen, wobei sich die Bohrungen bis auf Hohe der Ringpartie erstrecken Im Bereich der Kolbennaben sind die War¬ merohre leicht gebogen ausgeführt, um die Montage des Kolbenbolzens in den Kol¬ ben zu ermöglichen Die an sich bekannte Wirkungsweise der Warmerohre besteht in der Verdampfung der im Warmerohr befindlichen Flüssigkeit auf der „heißen" Seite - Verdampferseite - durch Absorption der Warme des zu kühlenden Bereiches Die gebildeten Dampfteile strömen zur „kalten" Seite - Kondensatorseite - des Warmerohres, wo sie unter Abgabe ihrer latenten Verdampfungswarme infolge des Temperaturgefalles zwischen heißer und kalter Seite wieder in den Flussigkeitszu- stand übergehen Auf der kalten Seite wird durch Anspritzen von Kuhlol aus dem Kurbelwellenraum des Verbrennungsmotors die Verdampfungswarme abtranspor¬ tiert Um einen derartigen Abtransport der Warme bei einer Vielzahl von einzelnen Wärmerohren zu gewährleisten, ist ein Ansprühen aller Wärmerohre erforderlich, welches zu einer aufwendigen und kostenintensiven Kolbenkonstruktion führt.US Pat. No. 5,454,351 discloses a light metal piston for an internal combustion engine which uses so-called heat pipes to remove heat from the hot piston regions. The air-tight and pressure-tight seals a slightly evaporating coolant, preferably water or else ammonia , Glycol or the like, contains The existing copper heat pipes are circumferentially equally distributed holes that are introduced in the crankshaft side piston crown area, inserted or poured, the holes extend to the height of the ring section in the area of the piston bosses War¬ merohre are light bent in order to allow the assembly of the piston pin in the Kol¬ ben The known manner of operation of the heat pipes consists in the evaporation of the liquid located in the heat pipe on the "hot" side - evaporator side - by absorbing the heat of the area to be cooled The formed Steam parts strö to the "cold" side - the condenser side - of the heat pipe, where they change to the liquid state due to the temperature drop between the hot and the cold side due to the temperature drop. On the cold side, the heat of evaporation is impinged by the injection of coolant from the crankshaft space of the internal combustion engine In order to remove such warmth from a large number of individuals To ensure heat pipes, a spraying of all heat pipes is required, which leads to a complex and costly piston design.
Der Erfindung liegt die Aufgabe zugrunde, einen Leichtmetallkolben der eingangs genannten Art derart weiter auszugestalten, dass bei Vereinfachung der Kolbenkon¬ struktion eine verbesserte Wärmeabfuhr von den wärmebelasteten Kolbenbereichen erzielt und damit das Auftreten thermischer Spannungen verhindert wird.The invention has for its object to further design a light metal piston of the type mentioned above, that in simplifying the Kolbenkon¬ construction improved heat dissipation from the heat-loaded piston areas achieved and thus the occurrence of thermal stresses is prevented.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass bei einer Vielzahl mit Verdampfer- und Kondensatorseite versehenen flüssigkeitsgefüllten Wärmerohren die Verdampferseite durch kurze Rohrabschnitte gebildet sind, die in der Bodendicke zum Kolbenboden hin brennstrahlausgerichtet angeordnet und mittels eines zum Kolbenboden parallel verlaufenden Verbundwärmerohres verbunden sind. Mindes¬ tens zwei als Kondensatorseite wirkende Rohrabschnitte sind außerdem mit dem Verbundwärmerohr derart gekoppelt, dass durch eine an ihren kondensatorseitigen Enden angeordnete mit einer Rippung versehenen Rohrverbindung ein umlaufender geschlossener Prozesskreislauf der Kühlflüssigkeit zwischen Verdampferseite, Ver¬ bundwärmerohr und Kondensatorseite der Wärmerohre realisiert ist.This object is achieved in that at a plurality provided with evaporator and condenser side liquid-filled heat pipes, the evaporator side are formed by short pipe sections, which are Brennstrahlausdirichtet in the bottom thickness to the piston crown and connected by means of a piston bottom parallel to the composite heat pipe. At least two pipe sections acting as a condenser side are also coupled to the composite heat pipe in such a way that a circulating closed process circulation of the cooling liquid between the evaporator side, the composite heat pipe and the condenser side of the heat pipes is realized by a pipe connection provided with a ribbing at its condenser-side ends.
Dadurch, dass die Rohrverbindung zwischen den kondensatorseitigen Rohrabschnit¬ ten derart ausgebildet ist, dass zwischen oberen Totpunkt und unteren Totpunkt des Leichtmetallkolbens die Rippung dauerhaft mit einem kurbelwellenseitigen Kühlöl- strahl einer Öldüse des Verbrennungsmotors beaufschlagt ist, wird vorteilhaft ein effektiver und schneller Wärmeabtransport am kondensatorseitigen Ende des Wär¬ merohres erreicht. Das zum Kolbenboden parallel verlaufende Verbundwärmerohr sorgt außerdem für eine gleichmäßige Temperaturverteilung entlang des Kolben¬ muldenrandes, wodurch Rissbildungen am Kolbenboden und Muldenrand der Verbrennungsmulde infolge thermischer Spannungen wirksam verhindert werden.Characterized in that the pipe connection between the condenser side Rohrabschnit¬ th is formed such that between top dead center and bottom dead center of the light metal piston, the rib is permanently applied to a crankshaft side Kühlöl- jet of an oil nozzle of the engine, advantageously an effective and faster heat removal at the condenser end of the heat pipe. The composite heat pipe running parallel to the piston crown also ensures a uniform temperature distribution along the edge of the piston bowl, as a result of which crack formation on the piston head and bowl edge of the combustion bowl due to thermal stresses is effectively prevented.
Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche. Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigenAdvantageous embodiments of the invention are the subject of the dependent claims. An embodiment of the invention will be described below with reference to the drawings. Show it
Fig. 1 eine erfindungsgemäße erste Ausführung des Kühlsystems in einemFig. 1 shows a first embodiment of the cooling system according to the invention in one
Leichtmetallkolben; Fig. 2 eine erfindungsgemäße zweite Ausführung des Kühlsystems in einemAluminum pistons; Fig. 2 shows a second embodiment of the cooling system according to the invention in one
Leichtmetallkolben; Fig. 3 eine perspektivische Ansicht eines Leichtmetallkolbens mit integriertemAluminum pistons; Fig. 3 is a perspective view of a light metal piston with integrated
Kühlsystem gemäß Fig. 1.Cooling system according to FIG. 1.
Wie aus Fig. 1 ersichtlich ist, wird ein Kühlsystem 20, welches einen geschlossenen Kühlkreislauf darstellt, aus Wärmerohren - sogenannte Heat Pipes 6 - mit einer Viel¬ zahl von Verdampferseiten 6a und wenigsten zwei Kondensatorseiten 6b gebildet, die über ein Verbundwärmerohr 7 verbunden sind. Am kondensatorseitigem Ende 6c der Wärmerohre 6b ist eine Rohrverbindung 8 mit einer auf dieser angeordneten äußeren Rippung 9 vorgesehen, durch welche die kondensatorseitigen Enden 6c der beiden Wärmerohre 6b gekoppelt sind. Zur weiteren Vergrößerung einer wärmeab¬ gebender Fläche kann neben der Rippung 9 auch an den Kondensatorseiten 6b der Wärmerohre 6 zusätzliche Rippungen (nicht dargestellt) angebracht sein, die zur Massereduzierung ebenfalls aus Aluminium bestehen. Die vorgenannte Kühlkreisan¬ ordnung besteht bevorzugt aus Kupferrohren oder kann auch aus Aluminiumrohren bestehen, die mit Wärmeträgeröl oder mit Frostschutzzusatz versehenem Wasser als Kühlflüssigkeit befüllt. Die geometrischen Abmessungen des Kühlsystems 20 erlauben ihren Einsatz in Aluminiumkolben ohne wesentliche Veränderung der geforderten hohen Bauteilfestigkeit. Als vorgefertigtes Produkt wird die Kühlanord¬ nung in eine Gießform zur Herstellung eines Aluminium-Leichtmetallkolbens 10 ein¬ gelegt, um anschließend den Kolben nach bekanntem Gießverfahren herzustellen. Infolge der ähnlichen Ausdehnungskoeffizienten zwischen Aluminium und Kupfer sind im Motorbetrieb eines derart hergestellten Leichtmetallkolbens 10 keine Span¬ nungsprobleme beobachtet worden. In einer weiteren Herstellungsvariante des Kühlsystems 20 ist das Verbundwär¬ merohr 7 einschließlich die Verdampferseite 6a der Wärmerohre 6 mittels eines in die Gießform eingelegten Salzkernes realisiert, wobei wenigstens 2 von verwende¬ ten 3 Auflagepinolen für den Salzkern als Anschluss für die kondensatorseitigen Wärmerohre 6b dienen. Durch Ausspülen des Salzkernes entsteht die gemäß Fig. 1 und Fig. 2 angegebene Struktur im Leichtmetallkolben ohne Kondensatorseite 6b und Rohrverbindung 8 der Wärmerohre 6, die nach der Endbearbeitung des Leicht¬ metallkolbens 10 in die entsprechenden Öffnungen des Verbundwärmerohres 7 ein¬ gesetzt und anschließend verlötet oder verklebt werden. Das Evakuieren und Befül- len des Kühlsystems 20 erfolgt über eine am kondensatorseitigen Ende eingebrachte Bohrung, die nach dem Befüllen mit Kühlflüssigkeit luftdicht verschlossen wird. Die Kühlflüssigkeit, insbesondere Wasser, muss vor dem Abfüllen unter Vakuum bei einem Druck von 10"4 bis 10'5 bar entgast werden, um eine Kavitation infolge der Kolbenbewegung im Verbrennungsmotor zu verhindern. In den Umkehrpunkten des Kolbens beschleunigt die Kühlflüssigkeit auf die gegenüberliegende Seite, wobei es zu implodierenden Gasblasen mit einhergehender Kavitation kommen kann. Zweck¬ mäßigerweise ist das Kühlsystem maximal bis zur Hälfte seines Volumens mit Kühl¬ flüssigkeit gefüllt.As can be seen from FIG. 1, a cooling system 20, which constitutes a closed cooling circuit, is formed from heat pipes - so-called heat pipes 6 - with a plurality of evaporator sides 6a and at least two condenser sides 6b, which are connected via a composite heat pipe 7. At the condenser-side end 6c of the heat pipes 6b, there is provided a pipe joint 8 having an outer rib 9 disposed thereon through which the condenser-side ends 6c of the two heat pipes 6b are coupled. For further enlargement of a heat-emitting surface, in addition to the ribbing 9, additional ribs (not shown) can also be attached to the condenser sides 6b of the heat pipes 6, which ribs likewise consist of aluminum for mass reduction. The aforementioned Kühlkreisan¬ order preferably consists of copper tubes or may also consist of aluminum tubes filled with heat transfer oil or provided with antifreeze additive water as a cooling liquid. The geometric dimensions of the cooling system 20 allow their use in aluminum pistons without significant change in the required high component strength. As a prefabricated product, the cooling arrangement is inserted into a casting mold for producing an aluminum light metal piston 10, in order subsequently to produce the piston by a known casting method. As a result of the similar coefficients of expansion between aluminum and copper, no stress problems have been observed during engine operation of a light metal piston 10 produced in this way. In a further production variant of the cooling system 20, the composite heat pipe 7, including the evaporator side 6a of the heat pipes 6, is realized by means of a salt core inserted into the casting mold, wherein at least 2 of used three support sleeves for the salt core serve as connection for the condenser-side heat pipes 6b. By rinsing out the salt core, the structure shown in FIG. 1 and FIG. 2 is formed in the light metal piston without condenser side 6b and pipe connection 8 of the heat pipes 6, which after finishing the light metal piston 10 are inserted into the corresponding openings of the composite heat pipe 7 and then soldered or glued. The evacuation and filling of the cooling system 20 takes place via a bore introduced at the condenser end, which is hermetically closed after being filled with coolant. The cooling liquid, in particular water, must be degassed before filling under vacuum at a pressure of 10 "4 to 10 '5 bar in order to prevent cavitation as a result of piston movement in the internal combustion engine , which can lead to imploding gas bubbles with concomitant cavitation, The expediently the cooling system is filled with cooling liquid at most up to half of its volume.
Fig. 2 zeigt ein weiteres Ausführungsbeispiel des erfindungsgemäßen Kühlsystems 20, bei dem zwei weitere Kondensatorseiten 6b in das Kühlsystem eingebracht sind, dessen umfangsseitige Verteilung im Leichtmetallkolben derart erfolgt, dass jeweils zwei auf der Druck- und Gegendruckseite angeordnet sind. Die Pfeilrichtung NB gibt den Verlauf der Nabenbohrung an.Fig. 2 shows another embodiment of the cooling system 20 according to the invention, in which two further capacitor sides 6b are introduced into the cooling system whose circumferential distribution in the light metal piston takes place such that two are arranged on the pressure and counter-pressure side. The arrow NB indicates the course of the hub bore.
Für beide Ausführungsbeispiele nach Fig. 1 und Fig. 2 gilt, dass die Verdampferseite 6a der Wärmerohre auf dem Umfang des Verbundwärmerohres 7 derart verteilt angeordnet sind, dass diese der Verteilung des Auftreffens der Brennstrahlen vom Verbrennungsmotor entsprechen. Gemäß der Figur 3 ist die Lage des Kühlsystems im Leichtmetallkolben 10 ersichtlich. Die durch kurze Rohrabschnitte gebildete Verdampferseiten 6a sind in der Bodendicke 1 1 angeordnet und zum Kolbenboden 1 hin brennstrahlausgerichtet. Das zum Kolbenboden 1 parallel verlaufende Verbundwärmerohr 7 verbindet die Verdampferseite 6a und mindestens zwei als Kondensatorseite 6b wirkende Rohrab¬ schnitte, wobei die mindestens zwei als Kondensatorseite 6a wirkende Rohrab¬ schnitte beabstandet vom Kolbenschaft 4 angeordnet sind.For both exemplary embodiments according to FIGS. 1 and 2, the evaporator side 6a of the heat pipes are arranged distributed on the circumference of the composite heat pipe 7 in such a way that they correspond to the distribution of the impingement of the combustion beams from the internal combustion engine. According to the figure 3, the location of the cooling system in the light metal piston 10 can be seen. The evaporator sides 6a formed by short pipe sections are arranged in the bottom thickness 1 1 and directed towards the piston head 1 towards the combustion jet. The composite heat pipe 7 running parallel to the piston head 1 connects the evaporator side 6a and at least two pipe sections acting as the condenser side 6b, wherein the at least two pipe sections acting as the condenser side 6a are arranged at a distance from the piston shank 4.
Die Ableitung der durch die Brennstrahlen des Verbrennungsmotors erzeugten Wärme vom Kolbenboden 1 , Verbrennungsmulde und der Region vom Feuersteg 12 sowie Ringpartie 3 erfolgt über die äußere Wand der Verdampferseite 6a der Wärmerohre und des Verbundwärmerohres 7 auf die innere Wand und wird durch die Kühlflüssigkeit unter Verdampfung selbiger absorbiert. Die gebildeten Dampfteile strömen über die Verbundwärmrohr 7 zur Kondensatorseite 6b der Wärmerohre 6, wo sie unter Abgabe ihrer latenten Verdampfungswärme infolge des Temperaturge¬ fälles zwischen Verdampferseite 6a und Kondensatorseite 6b wieder in den Flüssig¬ keitszustand übergehen. Auf der Kondensatorseite 6b, speziell der Rohrverbindung 8 wird durch das Anspritzen von Kühlöl aus dem Kurbelwellenraum des Verbren¬ nungsmotors mittels der Öldüse 13 die Verdampfungswärme abtransportiert.The dissipation of the heat generated by the combustion jets of the engine from the piston head 1, combustion bowl and the region of the top land 12 and ring section 3 via the outer wall of the evaporator 6a of the heat pipes and the composite heat pipe 7 on the inner wall and is selbiger by the cooling liquid under evaporation absorbed. The vapor parts formed flow through the composite heat pipe 7 to the condenser side 6b of the heat pipes 6, where they pass back into the liquid state with release of their latent heat of vaporization as a result of the temperature gradient between evaporator side 6a and condenser side 6b. On the condenser side 6b, especially of the pipe connection 8, the heat of vaporization is removed by injecting cooling oil from the crankshaft space of the combustion engine by means of the oil nozzle 13.
Durch die Konstruktion des Kühlsystems ist damit während der Bewegung des Kol¬ ben zwischen oberen Totpunkt und unteren Totpunkt ein dauerhafter Abtransport der Verdampfungswärme aus den Wärmerohren 6 gewährleistet. Der Einsatz des Leichtmetallkolbens aus AISi- Legierung mit erfindungsgemäßem Kühlsystem 20 ist für Dieselmotoren besonders geeignet. BezugszeichenAs a result of the design of the cooling system, a permanent removal of the heat of vaporization from the heat pipes 6 is ensured during the movement of the piston between top dead center and bottom dead center. The use of the light metal piston of AISi alloy with inventive cooling system 20 is particularly suitable for diesel engines. reference numeral
Leichtmetallkolben 10Light metal piston 10
Kühlsystem 20Cooling system 20
Kolbenbodeπ 1Kolbenbodeπ 1
Ringpartie 3Ring game 3
Kolbenschaft 4Piston shaft 4
Wärmerohr 6Heat pipe 6
Verdampferseite 6aEvaporator 6a
Kondensatorseite 6b kondensatorseitiges Ende des Verbundwärmerohres 6cCondenser side 6b condenser end of the composite heat pipe 6c
Verbundwärmerohr 7Composite heat pipe 7
Rohrverbindung 8Pipe connection 8
Rippung 9Ribbing 9
Bodendicke 1 1Floor thickness 1 1
Feuersteg 12Firestop 12
Öldüse 13 Oil nozzle 13

Claims

Patentansprüche claims
1. Leichtmetallkolben (10) mit Wärmerohreπ, mit einer im Kolbenboden (1 ) ange¬ ordneten Verbrennungsmulde (2) geeigneter Bodendicke, einer Ringpartie (3), Kolbenschaft (4) und Kolbennaben zur Aufnahme eines Kolbenbolzens sowie mit einer Vielzahl verschlossener, mit Verdampfer- (6a) und Kondensatorseite (6b) versehenen, flüssigkeitsgefüllten Wärmerohren (6), die umfangsseitig in der Nähe der Ringpartie (3) verteilt angeordnet und axial zur Kolbenachse (A) ausgerichtet sind, dadurch gekennzeichnet,1. light metal piston (10) with Wärmerohreπ, with a in the piston head (1) ange¬ arranged combustion bowl (2) suitable bottom thickness, a ring portion (3), piston skirt (4) and piston hubs for receiving a piston pin and a plurality of sealed, with evaporator - (6a) and capacitor side (6b) provided, liquid-filled heat pipes (6) arranged circumferentially distributed in the vicinity of the ring part (3) and aligned axially to the piston axis (A), characterized
- dass die Verdampferseite (6a) der Wärmerohre (6) durch kurze Rohrab¬ schnitte gebildet sind, die in der Bodendicke (13) zum Kolbenboden (1 ) hin brennstrahlausgerichtet angeordnet und mittels eines zum Kolbenboden (1 ) parallel verlaufenden Verbundwärmerohres (7) verbunden sind;- That the evaporator side (6a) of the heat pipes (6) are formed by short Rohrab¬ sections arranged Brennstrahlausdirichtet in the bottom thickness (13) to the piston head (1) and connected by means of a piston bottom (1) extending parallel composite heat pipe (7) are;
- dass mindestens zwei als Kondensatorseite (6b) wirkende Rohrabschnitte mit dem Verbundwärmerohr (7) derart gekoppelt sind, dass durch eine an ihren kondensatorseitigen Enden (7a) angeordnete Rohrverbindung (8) ein umlaufender geschlossener Prozesskreislauf der Kühlflüssigkeit zwischen Verdampferseite, Verbundwärmerohr und Kondensatorseite der Wärmerohre (6) realisiert ist.- That at least two as the condenser (6b) acting pipe sections with the composite heat pipe (7) are coupled such that by a at their condenser ends (7a) arranged pipe connection (8) a circulating closed process cycle of the cooling liquid between evaporator side, composite heat pipe and condenser side of the heat pipes (6) is realized.
2. Leichtmetallkolben nach Anspruch 1 , dadurch gekennzeichnet, dass das Ver¬ bundwärmerohr (6) auf Höhe der Ringpartie (3) zwischen Muldenrand und Feuersteg (12) angeordnet ist.2. Light metal piston according to claim 1, characterized in that the Ver¬ bundwärmerohr (6) at the level of the ring portion (3) between the bowl rim and top land (12) is arranged.
3. Leichtmetallkolben nach Anspruch 1 und 2, dadurch gekennzeichnet, dass die wenigstens zwei kondensatorseitig wirkenden Rohrabschnitte (6b) auf der Druck- oder Gegendruckseite beabstandet vom Kolbenschaft (4) angeordnet sind. 3. Light metal piston according to claim 1 and 2, characterized in that the at least two condenser side acting pipe sections (6 b) on the pressure or counter-pressure side spaced from the piston shaft (4) are arranged.
4. Leichtmetallkolben nach Anspruch 3, dadurch gekennzeichnet, dass die an den kondensatorseitigen Enden (6b) angeordnete Rohrverbindung (8) eine Vergrö¬ ßerung der wärmeabgebenden Fläche durch eine Rippung (9) aufweist.4. Light metal piston according to claim 3, characterized in that at the condenser-side ends (6b) arranged pipe connection (8) has an enlargement of the heat-emitting surface by a ribbing (9).
5. Leichtmetallkolben nach Anspruch 4, dadurch gekennzeichnet, dass die Rohr¬ verbindung (8) zwischen den Rohrabschnitten (6b) derart aufgebildet ist, dass zwischen oberen Totpunkt (OT) und unteren Totpunkt (UT) des Leichtmetallkol¬ bens die Rippung (9) dauerhaft mit einem kurbelwellenseitigen Kühlölstrahl (14) einer Öldüse (13) des Verbrennungsmotorsmotors beaufschlagt ist. 5. light metal piston according to claim 4, characterized in that the Rohr¬ connection (8) between the pipe sections (6b) is formed such that between top dead center (TDC) and bottom dead center (UT) of the Leichtmetallkol¬ bens the ribbing (9) permanently charged with a crankshaft side cooling oil jet (14) of an oil nozzle (13) of the internal combustion engine engine.
EP05774022.7A 2004-08-11 2005-08-10 Lightweight piston comprising heat pipes Expired - Fee Related EP1778964B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004038945A DE102004038945A1 (en) 2004-08-11 2004-08-11 Light metal piston with heat pipes
PCT/DE2005/001410 WO2006015584A1 (en) 2004-08-11 2005-08-10 Lightweight piston comprising heat pipes

Publications (2)

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EP1778964A1 true EP1778964A1 (en) 2007-05-02
EP1778964B1 EP1778964B1 (en) 2016-03-09

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US (1) US7549368B2 (en)
EP (1) EP1778964B1 (en)
JP (1) JP5096146B2 (en)
KR (1) KR101279844B1 (en)
CN (1) CN101002013B (en)
BR (1) BRPI0513462A (en)
DE (1) DE102004038945A1 (en)
WO (1) WO2006015584A1 (en)

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BRPI0513462A (en) 2008-05-06
JP5096146B2 (en) 2012-12-12
DE102004038945A1 (en) 2006-02-23
JP2008509337A (en) 2008-03-27
CN101002013A (en) 2007-07-18
US7549368B2 (en) 2009-06-23
US20080078288A1 (en) 2008-04-03
EP1778964B1 (en) 2016-03-09
WO2006015584A1 (en) 2006-02-16
KR101279844B1 (en) 2013-07-05
CN101002013B (en) 2010-04-14
KR20070049202A (en) 2007-05-10

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