EP1741914B1 - Cylinder head cover - Google Patents
Cylinder head cover Download PDFInfo
- Publication number
- EP1741914B1 EP1741914B1 EP06115730A EP06115730A EP1741914B1 EP 1741914 B1 EP1741914 B1 EP 1741914B1 EP 06115730 A EP06115730 A EP 06115730A EP 06115730 A EP06115730 A EP 06115730A EP 1741914 B1 EP1741914 B1 EP 1741914B1
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- EP
- European Patent Office
- Prior art keywords
- cylinder head
- liquid
- head cover
- channels
- tight
- 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.)
- Not-in-force
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Classifications
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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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
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- 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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/04—Arrangements of liquid pipes or hoses
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- 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
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
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- 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
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/024—Cooling cylinder heads
Definitions
- the invention relates to a cover for an internal combustion engine according to the preamble of claim 1.
- cooling liquid channels are contained in the cylinder block and in the cylinder head, which serve to protect the sensitive cylinder with the piston running therein from overheating.
- the cylinder pitches become smaller and smaller, it becomes difficult to guide the cooling liquid passages between the cylinders according to the cross-flow principle from one cylinder block longitudinal side to the other.
- the DE 196 34 958 shows a way to provide thermoplastic cylinder head covers by means of the internal gas pressure method with channels which transport the lubricating oil within the cylinder head cover to the camshaft and to spray out of these channels on the camshaft.
- the object of the invention is to provide a cylinder head cover, which receives the engine side coolant circuit and passes lossless. This object is solved by the features of claim 1.
- the cylinder head cover according to the invention preferably consists of a plastic material.
- a thermoplastic such as polyamide or polypropylene to name, for example.
- the cover has a housing which covers certain functional elements, wherein the housing is tightly connected to a cylinder head of the internal combustion engine.
- the functional elements are, for example, the crank mechanism or else a crankcase gas ventilation device.
- the cover liquid-tight channels for the transport of cooling liquid wherein the channels with corresponding cooling liquid channels of the cylinder head are connectable.
- Due to the closed system of liquid-tight channels continues to increase in a very advantageous manner, the stiffness of the engine cover.
- the increased rigidity and the increased mass of the cover lead to a improved acoustics through better insulation of the mechanical noise of the crank mechanism.
- At least a portion of the liquid-tight channels of the cover have flange connections for connection to the cylinder head.
- these flange connections are arranged parallel to the connecting plane between the cylinder head and cover, so that the flange connections can preferably engage directly in openings within the planar sealing surface of the cylinder head sealing.
- sealing means are provided for the flange connections, which are arranged laterally outside of other sealing means between the cylinder head and cover.
- the first sealants for the flange connections can be represented for example by O-rings, 2-K seals or labyrinth seals.
- the sealant between the cylinder head and cover may also consist of, for example, a thermoplastic elastomer seal or cork seals or also ejected seals.
- the liquid-tight channels are substantially parallel to each other and connect the cooling liquid lines of the longitudinal sides of the cylinder head to each other transverse to the orientation of the cylinder.
- the liquid-tight channels replace the cross-flow channels extending between the cylinders within the cylinder block, resulting in the advantage of a simpler cylinder block production.
- Here can be dispensed with sand cores for the transverse channels in the cylinder block in the production of the cylinder block. Furthermore, this results in a more homogeneous temperature distribution within the cooling system.
- the liquid-tight channels can also run parallel to the longitudinal sides of the cylinder head and open into a common connecting flange.
- the cooling takes place here in individual channels in the cylinder block from bottom to top, which are summarized after the cylinder block via individual flange connections the channels bundled to form a large channel within the seal and then the longitudinal side of the Follow the cylinder block to an outlet flange.
- the previously required outlet for the cooling water is thus saved on the cylinder block, since this cost neutral can be molded to the cover with. If the outlet on the cover is directly connected to the radiator, reducing the tubing will result in a shorter cooling circuit, which will require less pump power. The lower pump power has a positive effect on the fuel consumption of the internal combustion engine.
- the shorter cooling circuit with a reduced amount of coolant, whereby the warm-up phase can be reduced, which also has a positive effect on fuel consumption and emissions.
- the reduced amount of coolant further results in a weight saving which is very important especially in the field of motor vehicles. Since in this concept, the cooling from bottom to top is carried out according to the normal temperature distribution within a liquid, all cylinders are at the same coolant temperatures and thus there are more homogeneous cooling conditions which have an advantageous effect on the expansion and the delay of the entire system within the internal combustion engine ,
- the liquid-tight channels are made in clamshell technique.
- the two partial shells are connected to one another in a liquid-tight manner by means of a welding or adhesive method.
- the welding method may be, for example, a vibration or a laser welding method. This process is extremely simple and inexpensive and the liquid-tight connection by welding or gluing is also given a high process reliability.
- the liquid-tight channels can also be made in the core meltdown process.
- a metal core is injected with a lower melting point than the plastic of the cover, resulting in the liquid-tight channels through the volume of the metal core.
- the cover is heated with the metal core in an oil bath to a temperature greater than the melting temperature of the metal core, such as a tin-bismuth alloy, which is below the melting temperature of the plastic.
- the metal core is melted out and there are the liquid-tight channels, which have a very high bursting pressure due to the homogeneous production.
- liquid-tight channels Another alternative possibility for producing the liquid-tight channels is to use a gas injection technique or Water injection technique to use, which is well known in the art and need not be further explained here.
- the liquid-tight channels simultaneously have means for venting the cooling fluid system. Since the liquid-tight channels are geodetically quite high due to the arrangement in the cylinder head cover, it is possible here to arrange a ventilation device at the highest point in each case so as to discharge air present in the cooling fluid system. This can preferably take place via an easily openable screw connection, which is arranged at the uppermost point of the liquid-tight channels. This also eliminates the expensive Leasebe diary the coolant system via the installation of a negative pressure in the fluid system of the internal combustion engine.
- a coolant reservoir is integrated into the cover, wherein the liquid-tight channels are correspondingly connected sealingly.
- the venting could for example be done via thedeckenkeitsaus GmbHs skilleder, and by the elimination of other lines to the surge tank, the above advantages result by reducing the cooling circuit.
- Thedeyogtstechniksaus GmbHs skilleder may be connected in two pieces or in one piece with the cover and is preferably made of a thermoplastic material produced by injection molding or blow molding.
- the liquid-tight channels can essentially run inside the cover, so that an external force does not automatically lead to a leakage of the liquid-tight channels.
- the connection can be made, for example, releasably or non-detachably by means of a clip-on or screwing method or in welding or adhesive methods.
- FIG. 1 shows a variant of the cylinder head cover according to the invention in a schematic view
- Figure 2 shows an alternative cylinder head cover in a schematic view
- FIG 3 shows a partial section of a cylinder head cover according to the invention.
- the cylinder head cover 10 has an oil filler neck 11 and a cover 12 disposed adjacent thereto for an oil separator.
- the oil separator is used to separate oil droplets from a blow-by gas stream, wherein the oil separator may include a non-woven, a Metallgewirk or even one or more cyclones.
- On the cover 12 for the oil separator a connection flange 13 is provided for discharging the cleaned blow-by gas.
- a plurality of mounting holes 14 are arranged, which are also located in the central region of the cylinder head cover 10.
- a plurality of liquid-tight cooling liquid lines 16 are provided, which is detachably or permanently connected to the cylinder head cover 10 from a first half shell 17, and a second half shell 18, which, for example via a vibration welding or bonding method with the first half shell 17th is connected exist.
- the liquid-tight cooling liquid lines 16 are preferably made of a thermoplastic material whereby the connection of the half-shells 17, 18 is simplified by means of a welding process. However, it is also possible with one-piece cooling liquid lines to perform this from a metal.
- the cooling liquid lines 16 are in this case arranged substantially parallel to one another and transfer the cooling liquid from one side of the cylinder block to the other. This makes it possible to dispense often between the cylinders arranged Querstromkühlmatikeitsön in the cylinder block, which greatly simplifies the production of the cylinder block.
- each vent screws 19 are arranged, which serve to provide the same during the filling of the cooling liquid system for venting. The screws are loosened, or completely unscrewed when filling the coolant system and only when coolant, After the existing air in the system has leaked through the openings, closed again.
- FIG. 2 shows an alternative embodiment of the cylinder head cover 10 according to the invention.
- the components corresponding to the previous figure are identified by the same reference numerals.
- the liquid-tight cooling liquid lines 16 open into manifolds 21, which are arranged parallel to the longitudinal sides of the cylinder block. These manifolds are bundled at one end into a common coolant outlet 20.
- the previously required outlet nozzle for the cooling liquid is saved on the cylinder block, since this can now be formed at neutral cost to the cylinder head cover 10 in the merger of the manifolds 21 with.
- At thedeckenkeitsauslass 20 then a not shown here cooling liquid hose is connected, which then opens into the radiator.
- the advantage is that the cooling liquid can flow evenly into bottom of the cylinder block in the bottom-up channels, and then collected in the top of the manifolds 21. This results in a particularly homogeneous temperature field of the cooling liquid between the individual cylinders.
- FIG. 3 shows a partial section of a cylinder head cover 10 according to the invention in a view from below.
- the previous figures corresponding components are provided with the same reference numerals.
- connecting flanges 22 can be seen, which represent the ends of the cooling liquid lines 16. These connecting flanges 22 are inserted into corresponding receiving bores of the cylinder block, not shown here, for receiving the cooling liquid.
- the connecting flanges 22 have independent seals 23 for liquid-tight sealing of the connection between the cylinder head cover 10 and the cylinder block.
- a seal 24 of the cylinder head cover is executed, which represents the connection between the cylinder head cover 10 and cylinder block. This separate arrangement of the seals 23 and 24 ensures that in case of failure of one of the seals 23 or damage the coolant lines 16 no cooling water enters the interior of the cylinder head cover 10 and thus to the crank mechanism of the internal combustion engine.
Abstract
Description
Die Erfindung betrifft eine Abdeckung für eine Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a cover for an internal combustion engine according to the preamble of claim 1.
Heutige Brennkraftmaschinen sind zum allergrößten Teil Flüssigkeitsgekühlt. Dabei sind im Zylinderblock und im Zylinderkopf Kühlflüssigkeitskanäle enthalten, welche dazu dienen, die empfindlichen Zylinder mit den darin laufenden Kolben vor einer Überhitzung zu schützen. Da jedoch die Zylinderabstände immer geringer werden, wird es schwierig Kühlflüssigkeitskanäle zwischen den Zylindern gemäß dem Querstromprinzip von der einen Zylinderblocklängsseite zur anderen zu leiten.Today's internal combustion engines are for the most part liquid-cooled. In this case, cooling liquid channels are contained in the cylinder block and in the cylinder head, which serve to protect the sensitive cylinder with the piston running therein from overheating. However, as the cylinder pitches become smaller and smaller, it becomes difficult to guide the cooling liquid passages between the cylinders according to the cross-flow principle from one cylinder block longitudinal side to the other.
Die
Die Aufgabe der Erfindung ist es eine Zylinderkopfhaube anzugeben, welche den brennkraftmaschinenseitigen Kühlflüssigkeitskreislauf aufnimmt und verlustfrei weitergibt. Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.The object of the invention is to provide a cylinder head cover, which receives the engine side coolant circuit and passes lossless. This object is solved by the features of claim 1.
Die erfindungsgemäße Zylinderkopfhaube besteht bevorzugt aus einem Kunststoffmaterial. Hier ist beispielsweise ein thermoplastischer Kunststoff wie Polyamid oder Polypropylen zu nennen. Die Abdeckung weist ein Gehäuse, welches bestimmte Funktionselemente abdeckt, auf, wobei das Gehäuse dicht mit einem Zylinderkopf der Brennkraftmaschine verbunden ist. Die Funktionselemente sind dabei beispielsweise der Kurbeltrieb oder aber auch eine Kurbelgehäusegasentlüftungsvorrichtung. Weiterhin weist die Abdeckung flüssigkeitsdichte Kanäle zum Transport von Kühlflüssigkeit auf, wobei die Kanäle mit entsprechenden Kühlflüssigkeitskanälen des Zylinderkopfes verbindbar sind. Dadurch kann die Kühlwasserverteilung aus dem Zylinderblock heraus einfach und kostengünstig weitergeführt werden. Durch das geschlossene System der flüssigkeitsdichten Kanäle erhöht sich weiterhin in sehr vorteilhafter Weise die Steifigkeit der Brennkraftmaschinenabdeckung. Weiterhin führen die erhöhte Steifigkeit und die erhöhte Masse der Abdeckung zu einer verbesserten Akustik durch eine bessere Dämmung der mechanischen Geräusche des Kurbeltriebes.The cylinder head cover according to the invention preferably consists of a plastic material. Here is a thermoplastic such as polyamide or polypropylene to name, for example. The cover has a housing which covers certain functional elements, wherein the housing is tightly connected to a cylinder head of the internal combustion engine. The functional elements are, for example, the crank mechanism or else a crankcase gas ventilation device. Furthermore, the cover liquid-tight channels for the transport of cooling liquid, wherein the channels with corresponding cooling liquid channels of the cylinder head are connectable. As a result, the cooling water distribution from the cylinder block can be continued easily and inexpensively. Due to the closed system of liquid-tight channels continues to increase in a very advantageous manner, the stiffness of the engine cover. Furthermore, the increased rigidity and the increased mass of the cover lead to a improved acoustics through better insulation of the mechanical noise of the crank mechanism.
Wenigstens ein Teil der flüssigkeitsdichten Kanäle der Abdeckung weisen Flanschanschlüsse zur Verbindung mit dem Zylinderkopf auf. Dabei sind diese Flanschanschlüsse parallel zur Verbindungsebene zwischen Zylinderkopf und Abdeckung angeordnet, so dass die Flanschanschlüsse bevorzugt direkt in Öffnungen innerhalb der planen Dichtfläche des Zylinderkopfes dichtend eingreifen können. Weiterhin sind Dichtmittel für die Flanschanschlüsse vorgesehen, welche seitlich außerhalb von weiteren Dichtmitteln zwischen Zylinderkopf und Abdeckung angeordnet sind. Die ersten Dichtmittel für die Flanschanschlüsse können beispielsweise durch O-Ringe, 2-K-Dichtungen oder Labyrinthdichtungen dargestellt werden. Die Dichtmittel zwischen Zylinderkopf und Abdeckung können ebenso aus beispielsweise einer thermoplastischen Elastomerdichtung oder Korkdichtungen oder auch ausgespritzten Dichtungen bestehen. Wichtig ist hierbei die getrennte, unabhängige Verwendung der beiden Dichtmittel, so dass ein Versagen einer Dichtung in der Flanschverbindung zwischen flüssigkeitsdichtem Kanal und Zylinderkopf nicht zu einem Eintreten von Kühlflüssigkeit in das Innere der Abdeckung führen kann. So sind die innerhalb der Abdeckung liegenden Funktionselemente vor eindringender Kühlflüssigkeit geschützt. Bevorzugt sind dabei die Dichtmittel für die Flanschanschlüsse und die Dichtmittel für die Verbindung zwischen Abdeckung und Zylinderkopf vollkommen autark und separat ausgeführt, es ist jedoch auch möglich diese Dichtmittel beispielsweise über einen Steg zur Handlingverbesserung miteinander zu verbinden.At least a portion of the liquid-tight channels of the cover have flange connections for connection to the cylinder head. In this case, these flange connections are arranged parallel to the connecting plane between the cylinder head and cover, so that the flange connections can preferably engage directly in openings within the planar sealing surface of the cylinder head sealing. Furthermore, sealing means are provided for the flange connections, which are arranged laterally outside of other sealing means between the cylinder head and cover. The first sealants for the flange connections can be represented for example by O-rings, 2-K seals or labyrinth seals. The sealant between the cylinder head and cover may also consist of, for example, a thermoplastic elastomer seal or cork seals or also ejected seals. Important here is the separate, independent use of the two sealing means, so that a failure of a seal in the flange connection between liquid-tight channel and cylinder head can not lead to the entry of coolant into the interior of the cover. Thus, the functional elements lying within the cover are protected against the ingress of cooling fluid. Prefers are the sealant for the flange connections and the sealant for the connection between the cover and cylinder head completely self-sufficient and executed separately, but it is also possible to connect these sealants, for example via a web to improve handling together.
Die flüssigkeitsdichten Kanäle verlaufen im Wesentlichen parallel zueinander und die Kühlflüssigkeitsleitungen der Längsseiten des Zylinderkopfes quer zur Ausrichtung der Zylinder miteinander verbinden. Dabei ersetzen die flüssigkeitsdichten Kanäle die zwischen den Zylindern verlaufenden Querstromkanäle innerhalb des Zylinderblockes, wodurch sich der Vorteil einer einfacheren Zylinderblockfertigung ergibt. Hier kann bei der Herstellung des Zylinderblockes auf Sandkerne für die Querkanäle im Zylinderblock verzichtet werden. Weiterhin erfolgt hierdurch eine homogenere Temperaturverteilung innerhalb des Kühlsystems.The liquid-tight channels are substantially parallel to each other and connect the cooling liquid lines of the longitudinal sides of the cylinder head to each other transverse to the orientation of the cylinder. The liquid-tight channels replace the cross-flow channels extending between the cylinders within the cylinder block, resulting in the advantage of a simpler cylinder block production. Here can be dispensed with sand cores for the transverse channels in the cylinder block in the production of the cylinder block. Furthermore, this results in a more homogeneous temperature distribution within the cooling system.
Alternativ hierzu können die flüssigkeitsdichten Kanäle auch parallel zu den Längsseiten des Zylinderkopfes verlaufen und in einen gemeinschaftlichen Anschlussflansch münden. Die Kühlung erfolgt hierbei in Einzelkanälen im Zylinderblock von unten nach oben, wobei anschließend an den Zylinderblock über Einzelflanschanschlüsse die Kanäle gebündelt zu einem großen Kanal innerhalb der Abdichtung zusammengefasst werden und dann jeweils der Längsseite des Zylinderblockes folgend zu einem Auslassflansch führen. In vorteilhafter Weise wird hierdurch am Zylinderblock der bislang erforderliche Auslassstutzen für das Kühlwasser eingespart, da dieser Kostenneutral an die Abdeckung mit angeformt werden kann. Wenn der Auslass an der Abdeckung direkt mit dem Kühler verbunden ist, ergibt sich durch die Verringerung von Schlauchleitungen ein kürzerer Kühlkreislauf wodurch eine geringere Pumpenleistung erforderlich ist. Die geringere Pumpenleistung wirkt sich positiv auf den Kraftstoffverbrauch der Brennkraftmaschine aus. Weiterhin wird ein schnelleres Aufheizen des Motors durch den kürzeren Kühlkreislauf mit reduzierter Kühlmittelmenge erreicht, wodurch die Warmlaufphase reduziert werden kann, welche sich ebenfalls positiv auf den Kraftstoffverbrauch und auf die Emissionen auswirkt. Die reduzierte Kühlmittelmenge ergibt weiterhin eine Gewichtseinsparung welches gerade im Bereich der Kraftfahrzeuge sehr wichtig ist. Da bei diesem Konzept die Kühlung von unten nach oben entsprechend der normalen Temperaturverteilung innerhalb einer Flüssigkeit vollzogen wird, liegen an allen Zylindern die gleichen Kühlmitteltemperaturen an und es entstehen somit homogenere Kühlbedingungen welche sich vorteilhaft auf die Ausdehnung und den Verzug des gesamten Systems innerhalb der Brennkraftmaschine auswirken.Alternatively, the liquid-tight channels can also run parallel to the longitudinal sides of the cylinder head and open into a common connecting flange. The cooling takes place here in individual channels in the cylinder block from bottom to top, which are summarized after the cylinder block via individual flange connections the channels bundled to form a large channel within the seal and then the longitudinal side of the Follow the cylinder block to an outlet flange. Advantageously, the previously required outlet for the cooling water is thus saved on the cylinder block, since this cost neutral can be molded to the cover with. If the outlet on the cover is directly connected to the radiator, reducing the tubing will result in a shorter cooling circuit, which will require less pump power. The lower pump power has a positive effect on the fuel consumption of the internal combustion engine. Furthermore, a faster heating of the engine is achieved by the shorter cooling circuit with a reduced amount of coolant, whereby the warm-up phase can be reduced, which also has a positive effect on fuel consumption and emissions. The reduced amount of coolant further results in a weight saving which is very important especially in the field of motor vehicles. Since in this concept, the cooling from bottom to top is carried out according to the normal temperature distribution within a liquid, all cylinders are at the same coolant temperatures and thus there are more homogeneous cooling conditions which have an advantageous effect on the expansion and the delay of the entire system within the internal combustion engine ,
Gemäß einer vorteilhaften Ausgestaltung der Erfindung sind die flüssigkeitsdichten Kanäle in Zweischalentechnik hergestellt. Die beiden Teilschalen werden beispielsweise über ein Schweiß- oder Klebverfahren flüssigkeitsdicht miteinander verbunden. Das Schweißverfahren kann zum Beispiel ein Vibrations- oder ein Laserschweißverfahren sein. Diese Verfahren sich äußerst einfach und kostengünstig und durch die flüssigkeitsdichte Verbindung durch Schweißen oder Kleben ist auch eine hohe Prozesssicherheit gegeben.According to an advantageous embodiment of the invention, the liquid-tight channels are made in clamshell technique. For example, the two partial shells are connected to one another in a liquid-tight manner by means of a welding or adhesive method. The welding method may be, for example, a vibration or a laser welding method. This process is extremely simple and inexpensive and the liquid-tight connection by welding or gluing is also given a high process reliability.
Alternativ hierzu können die flüssigkeitsdichten Kanäle auch im Kernausschmelzverfahren hergestellt werden. Dabei wird ein Metallkern mit einem niedrigeren Schmelzpunkt als der Kunststoff der Abdeckung umspritzt, wodurch sich die flüssigkeitsdichten Kanäle durch das Volumen des Metallkerns ergeben. Nach dem Aushärten des Kunststoffes, wird die Abdeckung mit dem Metallkern in einem Ölbad auf eine Temperatur größer als die Schmelztemperatur des Metallkerns, beispielsweise eine Zinn-Wismut-Legierung, erhitzt, welche unterhalb der Schmelztemperatur des Kunststoffs liegt. Dadurch wird der Metallkern ausgeschmolzen und es entstehen die flüssigkeitsdichten Kanäle, welche durch die homogene Herstellung einen sehr hohen Berstdruck aufweisen.Alternatively, the liquid-tight channels can also be made in the core meltdown process. In this case, a metal core is injected with a lower melting point than the plastic of the cover, resulting in the liquid-tight channels through the volume of the metal core. After curing of the plastic, the cover is heated with the metal core in an oil bath to a temperature greater than the melting temperature of the metal core, such as a tin-bismuth alloy, which is below the melting temperature of the plastic. As a result, the metal core is melted out and there are the liquid-tight channels, which have a very high bursting pressure due to the homogeneous production.
Eine weitere Alternative Möglichkeit zur Herstellung der flüssigkeitsdichten Kanäle besteht darin, eine Gasinjektionstechnik oder Wasserinjektionstechnik zu verwenden, welche im Stand der Technik hinreichend bekannt ist und hier nicht weiter erläutert werden muss.Another alternative possibility for producing the liquid-tight channels is to use a gas injection technique or Water injection technique to use, which is well known in the art and need not be further explained here.
Es ist vorteilhaft, wenn die flüssigkeitsdichten Kanäle gleichzeitig Mittel zur Entlüftung des Kühlflüssigkeitssystems aufweisen. Da die flüssigkeitsdichten Kanäle durch die Anordnung in der Zylinderkopfabdeckung geodätisch recht hoch liegen, ist es hier möglich, am höchsten Punkt jeweils eine Entlüftungsvorrichtung anzuordnen, um so im Kühlflüssigkeitssystem vorhandene Luft abzulassen. Bevorzugt kann dies über eine einfach zu Öffnende Schraubverbindung erfolgen, welche am obersten Punkt der flüssigkeitsdichten Kanäle angeordnet ist. Hierdurch entfällt auch das teure Erstbefüllen des Kühlflüssigkeitssystems über das Anlagen eines Unterdrucks im Flüssigkeitssystem der Brennkraftmaschine.It is advantageous if the liquid-tight channels simultaneously have means for venting the cooling fluid system. Since the liquid-tight channels are geodetically quite high due to the arrangement in the cylinder head cover, it is possible here to arrange a ventilation device at the highest point in each case so as to discharge air present in the cooling fluid system. This can preferably take place via an easily openable screw connection, which is arranged at the uppermost point of the liquid-tight channels. This also eliminates the expensive Erstbefüllen the coolant system via the installation of a negative pressure in the fluid system of the internal combustion engine.
Gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung ist ein Kühlflüssigkeitsausgleichsbehälter in die Abdeckung integriert, wobei die flüssigkeitsdichten Kanäle korrespondierend damit dichtend verbunden sind. Hier könnte die Entlüftung beispielsweise auch über den Kühlflüssigkeitsausgleichsbehälter erfolgen, und durch den Entfall weiterer Leitungen zu dem Ausgleichsbehälter ergeben sich die oben genannten Vorteile durch die Reduzierung des Kühlkreislaufes. Der Kühlfüssigkeitsausgleichsbehälter kann zweistückig oder einstückig mit der Abdeckung verbunden sein und ist bevorzugt aus einem thermoplastischen Kunststoff im Spritzgieß- oder Blasformverfahren hergestellt.According to a further advantageous embodiment of the invention, a coolant reservoir is integrated into the cover, wherein the liquid-tight channels are correspondingly connected sealingly. Here, the venting could for example be done via the Kühlflüssigkeitsausgleichsbehälter, and by the elimination of other lines to the surge tank, the above advantages result by reducing the cooling circuit. The Kühlfütsigkeitsausgleichsbehälter may be connected in two pieces or in one piece with the cover and is preferably made of a thermoplastic material produced by injection molding or blow molding.
Die flüssigkeitsdichten Kanäle können einerseits im Wesentlichen im Inneren der Abdeckung verlaufen, so dass eine Krafteinwirkung von außen nicht automatisch zu einer Undichtigkeit der flüssigkeitsdichten Kanäle führt. Andererseits ist es auch möglich, die flüssigkeitsdichten Kanäle im Wesentlichen außerhalb der Abdeckung zu führen, so dass diese beispielsweise nachträglich mit der Abdeckung für die Brennkraftmaschine verbunden werden können. Die Verbindung kann beispielsweise lösbar oder unlösbar über ein Klips- oder Schraubverfahren bzw. in Schweiß- oder Klebverfahren erfolgen.On the one hand, the liquid-tight channels can essentially run inside the cover, so that an external force does not automatically lead to a leakage of the liquid-tight channels. On the other hand, it is also possible to guide the liquid-tight channels substantially outside the cover, so that they can be subsequently connected to the cover for the internal combustion engine, for example. The connection can be made, for example, releasably or non-detachably by means of a clip-on or screwing method or in welding or adhesive methods.
Diese und weitere Merkmale von bevorzugten Weiterbildungen der Erfindung gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei der Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird.These and other features of preferred embodiments of the invention will become apparent from the claims and from the description and drawings, wherein the individual features are realized individually or in each case in the form of sub-combinations in the embodiment of the invention and in other fields and can represent advantageous and protectable versions for which protection is claimed here.
Weitere Einzelheiten der Erfindung werden in den Zeichnungen anhand von schematischen Ausführungsbeispielen beschrieben. Hierbei zeigtFurther details of the invention are described in the drawings with reference to schematic embodiments. This shows
Figur 1 eine Variante der erfindungsgemäßen Zylinderkopfhaube in einer schematischen Ansicht,1 shows a variant of the cylinder head cover according to the invention in a schematic view,
Figur 2 eine alternative Zylinderkopfhaube in einer schematischen Ansicht undFigure 2 shows an alternative cylinder head cover in a schematic view and
Figur 3 einen Teilausschnitt einer erfindungsgemäßen Zylinderkopfhaube.3 shows a partial section of a cylinder head cover according to the invention.
Die Figur 1 zeigt eine erfindungsgemäße Zylinderkopfhaube 10 in schematischer Ansicht. Die Zylinderkopfhaube 10 weist einen Öleinfüllstutzen 11 sowie eine benachbart dazu angeordnete Abdeckung 12 für einen Ölabscheider auf. Der Ölabscheider dient dazu, Öltröpfchen aus einem Blow-by-Gasstrom abzutrennen, wobei der Ölabscheider ein Vlies, ein Metallgewirk oder auch einen oder mehrere Zyklone beinhalten kann. An der Abdeckung 12 für den Ölabscheider ist ein Anschlussflansch 13 zur Abführung des gereinigten Blow-by-Gases vorgesehen. Am Umfang der Zylinderkopfhaube 10 verteilt sind mehrere Befestigungsbohrungen 14 angeordnet, welche sich außerdem auch im mittleren Bereich der Zylinderkopfhaube 10 befinden. Mittels dieser Befestigungsbohrungen 14 ist es möglich, die Zylinderkopfhaube 10 über Schraubverbindungen dicht mit einem hier nicht dargestellten Zylinderkopf zu verbinden. Weiterhin sind im mittleren Bereich der Zylinderkopfhaube 10 mehrere Öffnungen 15 beispielsweise zum Einsetzen von Zündkerzen oder Injektoren angeordnet. Quer über die Längsseite der Zylinderkopfhaube 10 sind mehrere flüssigkeitsdichte Kühlflüssigkeitsleitungen 16 vorgesehen, welche aus einer ersten Halbschale 17 welche lösbar oder unlösbar mit der Zylinderkopfhaube 10 verbunden ist, und einer zweiten Halbschale 18, welche beispielsweise über ein Vibrationsschweiß- oder Klebverfahren mit der ersten Halbschale 17 verbunden wird, bestehen. Die flüssigkeitsdichten Kühlflüssigkeitsleitungen 16 bestehen dabei bevorzugt aus einem thermoplastischen Kunststoff wodurch die Verbindung der Halbschalen 17, 18 mittels eines Schweißverfahrens vereinfacht wird. Es ist jedoch auch bei einstückigen Kühlflüssigkeitsleitungen möglich diese aus einem Metall auszuführen. Die Kühlflüssigkeitsleitungen 16 sind hierbei im Wesentlichen parallel zueinander angeordnet und überführen die Kühlflüssigkeit von der einen Zylinderblockseite zur anderen. Dadurch ist es möglich oft zwischen den Zylindern angeordnete Querstromkühlflüssigkeitsleitungen im Zylinderblock zu verzichten, welches die Fertigung des Zylinderblockes stark vereinfacht. Im oberen Bereich der Kühlflüssigkeitsleitungen sind jeweils Entlüftungsschrauben 19 angeordnet, welche dazu dienen, beim Befüllen des Kühlflüssigkeitssystems für eine Entlüftung desselben zu sorgen. Die Schrauben werden gelöst, oder ganz rausgeschraubt beim Befüllen des Kühlflüssigkeitssystems und erst beim Austreten von Kühlflüssigkeit, nachdem die im System vorhandene Luft durch die Öffnungen ausgetreten ist, wieder verschlossen.1 shows a
Die Figur 2 zeigt eine alternative Ausgestaltung der erfindungsgemäßen Zylinderkopfhaube 10. Der vorherigen Figur entsprechende Bauteile sind mit den gleichen Bezugszeichen versehen. Die flüssigkeitsdichten Kühlflüssigkeitsleitungen 16 münden hierbei in Sammelleitungen 21, welche parallel zu den Längsseiten des Zylinderblocks angeordnet sind. Diese Sammelleitungen werden an einem Ende in einen gemeinsamen Kühlflüssigkeitsauslass 20 gebündelt. Dadurch wird am Zylinderblock der bislang erforderliche Auslassstutzen für die Kühlflüssigkeit eingespart, da dieser nun kostenneutral an die Zylinderkopfhaube 10 in der Zusammenführung der Sammelleitungen 21 mit angeformt werden kann. An den Kühlflüssigkeitsauslass 20 wird daraufhin ein hier nicht dargestellter Kühlflüssigkeitsschlauch angeschlossen, welcher dann in den Kühler mündet. Bei dieser Lösung besteht der Vorteil darin, dass die Kühlflüssigkeit von unten in den Zylinderblock gleichmäßig in von unten nach oben verlaufende Kanäle einströmen kann, und dann oben in den Sammelleitungen 21 gesammelt wird. Dabei ergibt sich ein besonders homogenes Temperaturfeld der Kühlflüssigkeit zwischen den einzelnen Zylindern.FIG. 2 shows an alternative embodiment of the
Die Figur 3 zeigt einen Teilausschnitt einer erfindungsgemäßen Zylinderkopfhaube 10 in einer Ansicht von unten. Den vorherigen Figuren entsprechende Bauteile sind mit den gleichen Bezugszeichen versehen. In dieser Ansicht sind Anschlussflansche 22 zu erkennen, welche die Enden der Kühlflüssigkeitsleitungen 16 darstellen. Diese Anschlussflansche 22 werden in entsprechende Aufnahmebohrungen des hier nicht dargestellten Zylinderblocks zur Aufnahme der Kühlflüssigkeit eingesetzt. Dabei weisen die Anschlussflansche 22 eigenständige Dichtungen 23 zur flüssigkeitsdichten Abdichtung der Verbindung zwischen Zylinderkopfhaube 10 und Zylinderblock auf. Separat davon ist eine Dichtung 24 der Zylinderkopfhaube ausgeführt, welche die Verbindung zwischen Zylinderkopfhaube 10 und Zylinderblock darstellt. Durch diese getrennte Anordnung der Dichtungen 23 und 24 wird gewährleistet, dass bei einem Ausfall einer der Dichtungen 23 oder einer Beschädigung der Kühlflüssigkeitsleitungen 16 kein Kühlwasser in das Innere der Zylinderkopfhaube 10 und damit an den Kurbeltrieb der Brennkraftmaschine gelangt.3 shows a partial section of a
Claims (10)
- Cylinder head cover, consisting preferably of a plastic material, featuring a housing that covers certain functional components, the housing being tightly connected with a cylinder head of the internal combustion engine, characterized in that the cylinder head cover features liquid-tight channels for conveying the cooling liquid, the channels being connectable with corresponding cooling liquid channels of the cylinder head and connecting the cooling liquid ducts of the longitudinal sides of the cylinder head transversely to the orientation of the cylinders.
- Cylinder head cover according to claim 1, characterized in that at least one part of the liquid-tight channels features flange connections for the connection with the cylinder head which are disposed in parallel to the connection plane between cylinder head and cover, furthermore, sealing compounds for the flange connections are provided for which are disposed laterally outside of the sealing compounds between cylinder head and cover.
- Cylinder head cover according to one of the above-mentioned claims, characterized in that the liquid-tight channels extend basically basically in parallel.
- Cylinder head cover according to one of the above-mentioned claims, characterized in that the liquid-tight channels are made of two shells.
- Cylinder head cover according to one of the claims 1 to 4, characterized in that the liquid-tight channels are manufactured by means of the lost core molding process.
- Cylinder head cover according to one of the claims 1 to 4, characterized in that the liquid-tight channels are manufactured by means of gas injection technology or water injection technology.
- Cylinder head cover according to one of the above-mentioned claims, characterized in that the liquid-tight channels feature means for the ventilation of the cooling liquid system.
- Cylinder head cover according to one of the above-mentioned claims, characterized in that a cooling liquid compensating reservoir is integrated in the cover, the liquid-tight channels being correspondingly sealingly connected with them.
- Cylinder head cover according to one of the above-mentioned claims, characterized in that the liquid-tight channels extend basically inside the cover.
- Cylinder head cover according to one of the claims 1 to 9, characterized in that the liquid-tight channels extend basically outside the cover.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202005010446U DE202005010446U1 (en) | 2005-06-30 | 2005-06-30 | Cylinder head cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1741914A1 EP1741914A1 (en) | 2007-01-10 |
| EP1741914B1 true EP1741914B1 (en) | 2008-01-09 |
Family
ID=37103091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06115730A Not-in-force EP1741914B1 (en) | 2005-06-30 | 2006-06-20 | Cylinder head cover |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1741914B1 (en) |
| AT (1) | ATE383508T1 (en) |
| DE (2) | DE202005010446U1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006019880A1 (en) * | 2006-04-28 | 2007-10-31 | Audi Ag | Motor housing cover for internal combustion engine, has inlet opening for exhaust medium that is conducted by exhaust system, and part of oil separator housing formed integrally with cover |
| DE102007058439A1 (en) * | 2007-12-05 | 2009-06-10 | Bayerische Motoren Werke Aktiengesellschaft | Valve cover/cylinder head cover for motor vehicle internal-combustion engine, has integrated cooling medium-flow through volume exhibiting increased surface at internal combustion engine-side |
| FR3130326A1 (en) * | 2021-12-14 | 2023-06-16 | Renault | Cylinder head of an internal combustion engine. |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU510164B2 (en) * | 1975-09-04 | 1980-06-12 | Brunswick Corporation | Outboard motor cooling system |
| JPS57135218A (en) * | 1981-02-12 | 1982-08-20 | Sanshin Ind Co Ltd | Cooling water control device for water cooled multi-cylinder engine |
| JPH07116937B2 (en) * | 1986-05-30 | 1995-12-18 | スズキ株式会社 | Cylinder head cooling method |
| DE3809687A1 (en) * | 1987-04-02 | 1988-10-13 | Volkswagen Ag | Reciprocating piston internal combustion engine with cooling by a coolant |
| JPH01130043A (en) * | 1987-11-13 | 1989-05-23 | Hino Motors Ltd | Cylinder-head cover gasket protector for engine |
| JP3035962B2 (en) * | 1990-03-09 | 2000-04-24 | スズキ株式会社 | Cooling water passage structure for V-type engine |
| JP4123470B2 (en) * | 2002-05-14 | 2008-07-23 | スズキ株式会社 | Cooling water bleeder for automobile engine |
-
2005
- 2005-06-30 DE DE202005010446U patent/DE202005010446U1/en not_active Expired - Lifetime
-
2006
- 2006-06-20 EP EP06115730A patent/EP1741914B1/en not_active Not-in-force
- 2006-06-20 DE DE502006000279T patent/DE502006000279D1/en not_active Expired - Fee Related
- 2006-06-20 AT AT06115730T patent/ATE383508T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP1741914A1 (en) | 2007-01-10 |
| ATE383508T1 (en) | 2008-01-15 |
| DE502006000279D1 (en) | 2008-02-21 |
| DE202005010446U1 (en) | 2006-11-09 |
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