EP1733132A1 - Water-cooled cylinder head for a multi-cylinder internal combustion engine - Google Patents

Water-cooled cylinder head for a multi-cylinder internal combustion engine

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Publication number
EP1733132A1
EP1733132A1 EP05726208A EP05726208A EP1733132A1 EP 1733132 A1 EP1733132 A1 EP 1733132A1 EP 05726208 A EP05726208 A EP 05726208A EP 05726208 A EP05726208 A EP 05726208A EP 1733132 A1 EP1733132 A1 EP 1733132A1
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EP
European Patent Office
Prior art keywords
cylinder head
water
cooling
combustion chamber
water jacket
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
EP05726208A
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German (de)
French (fr)
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EP1733132B1 (en
Inventor
Michael Paul
Frank Ickinger
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Application filed by Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP1733132A1 publication Critical patent/EP1733132A1/en
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Publication of EP1733132B1 publication Critical patent/EP1733132B1/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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream 
    • 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
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • F01P3/16—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs

Definitions

  • the invention relates to a water-cooled cylinder head for a multi-cylinder internal combustion engine according to the features of the preamble of claim 1.
  • the object of the invention is therefore to overcome the disadvantages mentioned above and to improve the cooling in the highly stressed areas of the cylinder head housing.
  • An additional cooling channel in the form of an injector hole ensures that the common annulus section is supplied directly with cooling water.
  • a further improvement or optimization of the cooling of the cylinder head housing is achieved if the water jacket in the area of the combustion chamber calotte and the inlet and outlet channels monitored by the valves have an essentially uniform wall thickness between 3 and 7 mm. Due to the constant water jacket thickness, higher flow rates of the cooling water can be achieved and thus the heat transfer can be improved.
  • a need-based cooling is ensured in that a main cooling flow runs between the two outlet valves in the direction of the receiving opening for the spark plug, while two secondary cooling flows are formed on the outside past the two outlet valves.
  • FIG. 1 shows a geometrical illustration of a water jacket in the cylinder head housing of an internal combustion engine
  • FIG. 2 shows a view of the water jacket in viewing direction A according to FIG. 1
  • FIG. 3 shows a view of the water jacket in viewing direction B according to FIG. 1
  • FIG. 4 shows an oblique view of the water jacket 1 and 5, a section through part of the cylinder head housing in the area of the receptacle for the spark plug.
  • cylinder head cooling chamber 2 a water jacket, hereinafter referred to as cylinder head cooling chamber 2, which is integrated in a cylinder head housing 4 of a multi-cylinder internal combustion engine.
  • the cylinder head cooling chamber 2 of each cylinder is supplied with cooling water via a central inflow opening 6 in the cylinder head housing 4.
  • a delta-shaped outflow opening 8 is provided, through which the coolant heated by the cylinder head housing 4 flows out to the suction side of the water pump, not shown, of the internal combustion engine.
  • the geometrical illustration of the cylinder head cooling chamber 2 shows two recesses 10 and 12 for the two exhaust valves and exhaust ports of the internal combustion engine; an opening 14 provided centrally in the cylinder head cooling space 2 forms the receptacle or the dome for a spark plug (not shown) of the cylinder in question.
  • a recess 22 for the two inlet valves or inlet ducts of the cylinder head section follows behind the two web-shaped recesses 16, 18 and the central opening 14.
  • the central annular space section 32 which extends over the arc length s (see FIG. 2), has a substantially constant height towards the combustion chamber trough 20, so that at least in this area the wall thickness a of the combustion chamber cap 36 is uniform and in the vertical direction up to close the combustion chamber trough 36 is brought up.
  • the wall thickness a of the combustion chamber cap 36 is reduced in the area of the annular space section 32 to between 5 and 10 mm.
  • a section 14a of the receiving opening 14 for the spark plug is reduced in diameter compared to the section 14b lying above it.
  • section 14a of the receiving opening 14 the spark plug thread is introduced, the length of which has been deliberately chosen such that the Central annulus section 32 and the two annulus sections 32 ' adjoining it on the left and right with their arc lengths s ' extend in the vertical direction exclusively at the level of the reduced thread diameter (section 14a), so that the cooling water jacket or the cylinder head cooling chamber 2 comes close to the spark plug dome is.
  • the cylinder head cooling chamber 2 is formed in the area of the combustion chamber cap 36 and the inlet and exhaust valves with a substantially uniform thickness or thickness, which is between 3 and 7 mm.
  • the measures described above can be used to effectively reduce the temperature peaks caused by the high heat input to the spark plug and the valve seat rings in this area.
  • the flow cross sections on the inflow side of the cylinder head cooling space 2 are designed such that the cooling water flow is divided into a main cooling flow Qi, Q 2 and Q 3 and two secondary cooling flows Q 4 and Q 5 .
  • the main cooling flow Qi, Q 2 and Q 3 is conducted between the two exhaust valves (recess 10, 12) in the direction of the spark plug dome (central opening 14), while the secondary cooling flows Q 4 and Q 5 run in the left and right edge areas of the cylinder head cooling chamber 2.
  • the cutouts 23, 24 mentioned at the beginning form constrictions for the two secondary cooling flows Q and Q 5 , so that the entire cooling water flow is divided, for example, in such a way that 50% of it flows in the direction of the main cooling flow Qi, Q 2 and Q 3 between the two exhaust valves of the spark plug dome are guided, while 25% of each are supplied via the secondary cooling flows Q 4 and Q 5 to the left and right edge regions of the cylinder head cooling chamber.

Abstract

The invention relates to a water-cooled cylinder head for a multi-cylinder internal combustion engine, comprising two inlet and outlet valves per cylinder, and a cylinder head cooling chamber (2) (water jacket) which is integrated into a cylinder head housing (4) provided with inlets and outlets (6, 8) for the coolant, and extends above a spherical cap (36) forming the combustion chamber cavity (20). Water jacket chambers (26, 28, 30) are formed, at least in sections, around a receiving opening (14) which is centrally arranged in the cylinder head housing (4) and used for a spark plug, and around the two outlet valves, said water jacket chambers being interconnected by means of a common annular chamber section (32). According to the invention, at least the common water jacket annular chamber section (32) has an essentially constant height up to the combustion chamber cavity (20), such that at least in this region, the wall thickness (a) of the combustion chamber spherical cap (36) is uniform and extends up to the combustion chamber cavity (20).

Description

Wassergekühlter Zylinderkopf für eine mehrzylindrige Brennkraftmaschine Water-cooled cylinder head for a multi-cylinder internal combustion engine
Die Erfindung betrifft einen wassergekühlten Zylinderkopf für eine mehrzylindrige Brennkraftmaschine gemäß den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a water-cooled cylinder head for a multi-cylinder internal combustion engine according to the features of the preamble of claim 1.
Insbesondere bei Hochleistungsmotoren treten trotz des wassergekühlten Zylinderkopfes aufgrund der hohen spezifischen Leistung insbesondere im Bereich zwischen den Auslassventilen bzw. zwischen Auslassventil und Zündkerze Temperaturspitzen bis zu 300 °C auf, die zu Temperaturspannungen im Material und in Verbindung mit äußeren Lasten zu bleibenden Verformungen im Ventilsitzringbereich der Auslassventile führen.In particular in high-performance engines, despite the water-cooled cylinder head, temperature peaks of up to 300 ° C occur in the area between the exhaust valves or between the exhaust valve and spark plug due to the high specific power, which leads to temperature stresses in the material and in connection with external loads to permanent deformations in the valve seat ring area Guide exhaust valves.
Aufgabe der Erfindung ist es daher, die zuvor genannten Nachteile zu überwinden und die Kühlung in den hochbelasteten Bereichen des Zylinderkopfgehäuses zu verbessern.The object of the invention is therefore to overcome the disadvantages mentioned above and to improve the cooling in the highly stressed areas of the cylinder head housing.
Die Aufgabe wird durch die im Anspruch 1 angegebenen Merkmale gelöst.The object is achieved by the features specified in claim 1.
Dadurch, dass der gemeinsame Wassermantel- Ringraumabschnitt zwischen den beiden Auslassventilen und der Aufnahmeöffnung für die Zündkerze eine im wesentlichen gleich bleibende Höhe aufweist und bis dicht an die Brennraummulde herangeführt ist, können die Temperaturspitzen in diesem Bereich wirkungsvoll abgebaut werden. Damit wird bspw. auch die Möglichkeit eröffnet, anstelle von hochwarmfesten Zylinderkopflegierungen, wie z.B. AICu5Nil,5CoSbZr kostengünstigere Standardlegierungen, wie z.B. AISi6Cu4 oder AISi7Mg zu verwenden. Andererseits wird durch die Temperaturabsenkung die Klopfneigung des Motors reduziert, so dass aufgrund der Zündwinkelverbesserungen Verbrauchsvorteile bzw. ein entsprechender Leistungszuwachs erzielt werden kann.The fact that the common water jacket annulus section between the two outlet valves and the receiving opening for the spark plug has a substantially constant height and is brought close to the combustion chamber trough, the temperature peaks can be effectively reduced in this area. This also opens up the possibility, for example, of replacing high-temperature-resistant cylinder head alloys, e.g. AICu5Nil, 5CoSbZr cheaper standard alloys, e.g. To use AISi6Cu4 or AISi7Mg. On the other hand, the tendency to knock of the engine is reduced by the lowering of the temperature, so that consumption advantages or a corresponding increase in performance can be achieved due to the improvements in the ignition angle.
Weitere, die Erfindung ausgestaltende Merkmale sind in den Unteransprüchen aufgeführt. Für eine schnelle und effektive Wärmeabführung im Bereich des Zündkerzendomes wird vorgeschlagen, den Durchmesser der Aufnahmeöffnung für die Zündkerze auf der Höhe des gemeinsamen Wassermantel- Ringraumabschnittes zu reduzieren. Umgesetzt werden kann diese Maßnahme bspw. dadurch, dass in diesem Bereich das Gewinde der Zündkerze ausgebildet ist, dessen Aussendurchmesser gegenüber dem Zündkerzengehäuse reduziert ist.Further features embodying the invention are listed in the subclaims. For rapid and effective heat dissipation in the area of the spark plug dome, it is proposed to reduce the diameter of the receiving opening for the spark plug at the level of the common water jacket annular space section. This measure can be implemented, for example, by designing the thread of the spark plug in this area, the outside diameter of which is reduced compared to the spark plug housing.
Untersuchungen haben gezeigt, dass eine optimale Kühlung der hochbelasteten Stellen bei gleichzeitig ausreichender Formstabilität insbesondere der Brennraumkalotte dann gewährleistet ist, wenn die Wandstärke der Brennraumkalotte zumindest im Bereich des gemeinsamen Ringraumabschnittes auf zwischen 5 und 11 mm reduziert ist.Investigations have shown that optimal cooling of the highly stressed points with sufficient dimensional stability, in particular of the combustion chamber cap, is ensured if the wall thickness of the combustion chamber cap is reduced to between 5 and 11 mm at least in the area of the common annular space section.
Ein zusätzlicher Kühlkanal in Form einer Injektorbohrung stellt sicher, dass der gemeinsame Ringraumabschnitt direkt mit Kühlwasser versorgt wird.An additional cooling channel in the form of an injector hole ensures that the common annulus section is supplied directly with cooling water.
Eine weitere Verbesserung bzw. Optimierung der Kühlung des Zylinderkopfgehäuses wird erreicht, wenn der Wassermantel im Bereich der Brennraumkalotte und der durch die Ventile überwachten Ein- und Auslasskanäle eine im wesentlichen einheitliche Wandstärke zwischen 3 und 7mm aufweist. Durch die konstante Wassermantelstärke können höhere Strömungsgeschwindigkeiten des Kühlwassers erzielt und damit die Wärmeübertragung verbessert werden.A further improvement or optimization of the cooling of the cylinder head housing is achieved if the water jacket in the area of the combustion chamber calotte and the inlet and outlet channels monitored by the valves have an essentially uniform wall thickness between 3 and 7 mm. Due to the constant water jacket thickness, higher flow rates of the cooling water can be achieved and thus the heat transfer can be improved.
Eine bedarfsgerechte Kühlung wird dadurch sichergestellt, dass ein Hauptkühlstrom zwischen den beiden Auslassventilen in Richtung der Aufnahmeöffnung für die Zündkerze verläuft, während aussen an den beiden Auslassventilen vorbei, zwei Nebenkühlströme ausgebildet sind. Durch eine gezielte Drosselung der beiden Nebenkühlströme durch entsprechende Verengungen in den entsprechenden Kühlkanälen wird sichergestellt, dass die Hauptkühlmenge direkt in den Zündkerzenbereich geleitet wird.A need-based cooling is ensured in that a main cooling flow runs between the two outlet valves in the direction of the receiving opening for the spark plug, while two secondary cooling flows are formed on the outside past the two outlet valves. By deliberately throttling the two secondary cooling flows through corresponding constrictions in the corresponding cooling channels, it is ensured that the main cooling quantity is led directly into the spark plug area.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt, das nachstehend näher beschrieben ist.In the drawing, an embodiment of the invention is shown, which is described in more detail below.
Es zeigen:Show it:
Fig. 1 eine geometrische Abbildung eines Wassermantels im Zylinderkopfgehäuse einer Brennkraftmaschine, Fig. 2 eine Ansicht des Wassermantels in Blickrichtung A gemäß Fig. 1, Fig. 3 eine Ansicht des Wassermantels in Blickrichtung B gemäß Fig. 1, Fig. 4 eine Schrägansicht des Wassermantels in Blickrichtung A gemäß Fig. 1 und Fig. 5 einen Schnitt durch einen Teil des Zylinderkopfgehäuses im Bereich der Aufnahme für die Zündkerze.1 shows a geometrical illustration of a water jacket in the cylinder head housing of an internal combustion engine, FIG. 2 shows a view of the water jacket in viewing direction A according to FIG. 1, FIG. 3 shows a view of the water jacket in viewing direction B according to FIG. 1, FIG. 4 shows an oblique view of the water jacket 1 and 5, a section through part of the cylinder head housing in the area of the receptacle for the spark plug.
In den Figuren 1 bis 4 ist die Geometrie eines Wassermantels, im folgenden als Zylinderkopfkühlraum 2 bezeichnet, dargestellt, der in einem Zylinderkopfgehäuses 4 einer mehrzylindrigen Brennkraftmaschine integriert ist.1 to 4 show the geometry of a water jacket, hereinafter referred to as cylinder head cooling chamber 2, which is integrated in a cylinder head housing 4 of a multi-cylinder internal combustion engine.
Der Zylinderkopfkühlraum 2 eines jeden Zylinders wird über eine zentrale Einströmöffnung 6 im Zylinderkopfgehäuse 4 mit Kühlwasser versorgt. Auf der gegenüberliegenden Seite des Zylinderkopfkühlraumes 2 ist eine deltaförmige Ausströmöffnung 8 vorgesehen, über die das vom Zylinderkopfgehäuse 4 erwärmte Kühlmittel zur Saugseite der nicht dargestellten Wasserpumpe der Brennkraftmaschine abströmt. In der geometrischen Abbildung des Zylinderkopfkühlraumes 2 sind zwei Ausnehmungen 10 und 12 für die beiden Auslassventile bzw. Auslasskanäle der Brennkraftmaschine erkennbar; eine zentral im Zylinderkopfkühlraum 2 vorgesehene Öffnung 14 bildet die Aufnahme bzw. den Dom für eine Zündkerze (nicht dargestellt) des betreffenden Zylinders. Links und rechts von der zentralen Öffnung 14 sind jeweils zwei stegförmige Ausnehmungen 16 und 18 zu sehen, die im Zylinderkopfgehäuse 4 als Positiv dazu jeweils zwei den Wassermantel 2 durchgreifende Stege bilden, mit deren Hilfe die im Zylinderkopfgehäuse 4 ausgebildete Brennraumkalotte 20 aufgehangen bzw. abgestützt ist.The cylinder head cooling chamber 2 of each cylinder is supplied with cooling water via a central inflow opening 6 in the cylinder head housing 4. On the opposite side of the cylinder head cooling chamber 2, a delta-shaped outflow opening 8 is provided, through which the coolant heated by the cylinder head housing 4 flows out to the suction side of the water pump, not shown, of the internal combustion engine. The geometrical illustration of the cylinder head cooling chamber 2 shows two recesses 10 and 12 for the two exhaust valves and exhaust ports of the internal combustion engine; an opening 14 provided centrally in the cylinder head cooling space 2 forms the receptacle or the dome for a spark plug (not shown) of the cylinder in question. To the left and right of the central opening 14, two web-shaped recesses 16 and 18 can be seen, each of which forms two webs in the cylinder head housing 4 as a positive element, with the aid of which the combustion chamber cap 20 formed in the cylinder head housing 4 is suspended or supported ,
In Strömungsrichtung des Kühlmittels gesehen, schließt sich hinter den beiden stegförmigen Ausnehmungen 16, 18 und der zentralen Öffnung 14 eine Ausnehmung 22 für die beiden Einlassventile bzw. Einlasskanäle des Zylinderkopfabschnittes an.Seen in the flow direction of the coolant, a recess 22 for the two inlet valves or inlet ducts of the cylinder head section follows behind the two web-shaped recesses 16, 18 and the central opening 14.
Auf der Einströmseite des Kühlmittels sind im Zylinderkopfkühlraum 2 zwei weitere Aussparungen 23 und 24 erkennbar, deren Positiv Strömungsverengungen im Zylinderkopfkühlraum 2 bilden, deren Funktion später noch näher erläutert ist. Wie aus Figur 2 ersichtlich, sind um die beiden Auslassventile und um die Zündkerze Wassermantelräume ausgebildet, die im vorliegenden Fall geschlossene Ringräume 26, 28 und 30 bilden; Ringraum 30 grenzt dabei an die beiden anderen Ringräume 26, 28 an, so dass ein gemeinsamer zentraler Ringraumabschnitt 32 gebildet ist. Ein in Form einer Bohrung im Zylinderkopfgehäuse 4 ausgebildeter Kühlkanal 34 führt von der Einströmöffnung 6 direkt zum gemeinsamen Ringraumabschnitt 32 und versorgt diesen hochtemperaturbelasteten Bereich zusätzlich direkt mit Kühlwasser.On the inflow side of the coolant, two further recesses 23 and 24 can be seen in the cylinder head cooling chamber 2, the positive of which form flow constrictions in the cylinder head cooling chamber 2, the function of which will be explained in more detail later. As can be seen from FIG. 2, water jacket spaces are formed around the two outlet valves and around the spark plug, which in the present case form closed annular spaces 26, 28 and 30; Annulus 30 adjoins the other two annuli 26, 28 so that a common central annulus section 32 is formed. A cooling channel 34 designed in the form of a bore in the cylinder head housing 4 leads from the inflow opening 6 directly to the common annular space section 32 and additionally supplies this high-temperature area directly with cooling water.
Der sich über die Bogenlänge s (siehe Fig. 2) erstreckende zentrale Ringraumabschnitt 32 weist eine zur Brennraummulde 20 hin im wesentlichen gleich bleibende Höhe auf, so dass zumindest in diesem Bereich die Wandstärke a der Brennraumkalotte 36 einheitlich ist und in vertikaler Richtung bis dicht an die Brennraummulde 36 herangeführt ist. Die Wandstärke a der Brennraumkalotte 36 ist dabei im Bereich des Ringraumabschnittes 32 auf zwischen 5 und 10 mm reduziert Wie aus Fig. 5 ersichtlich, ist ein Abschnitt 14a der Aufnahmeöffnung 14 für die Zündkerze in seinem Durchmesser gegenüber dem darüber liegenden Abschnitt 14b reduziert. Im Abschnitt 14a der Aufnahmeöffnung 14 ist das Zündkerzengewinde eingebracht, dessen Länge bewusst so gewählt worden ist, dass der zentrale Ringraumabschnitt 32 sowie die beiden links und rechts daran angrenzenden Ringraumabschnitte 32' mit ihren Bogenlängen s' sich in vertikaler Richtung ausschließlich auf der Höhe des reduzierten Gewindedurchmessers (Abschnitt 14a) erstrecken, so dass der Kühlwassermantel bzw. der Zylinderkopfkühlraum 2 dicht an den Zündkerzendom herangeführt ist.The central annular space section 32, which extends over the arc length s (see FIG. 2), has a substantially constant height towards the combustion chamber trough 20, so that at least in this area the wall thickness a of the combustion chamber cap 36 is uniform and in the vertical direction up to close the combustion chamber trough 36 is brought up. The wall thickness a of the combustion chamber cap 36 is reduced in the area of the annular space section 32 to between 5 and 10 mm. As can be seen from FIG. 5, a section 14a of the receiving opening 14 for the spark plug is reduced in diameter compared to the section 14b lying above it. In section 14a of the receiving opening 14, the spark plug thread is introduced, the length of which has been deliberately chosen such that the Central annulus section 32 and the two annulus sections 32 ' adjoining it on the left and right with their arc lengths s ' extend in the vertical direction exclusively at the level of the reduced thread diameter (section 14a), so that the cooling water jacket or the cylinder head cooling chamber 2 comes close to the spark plug dome is.
Zur Erhöhung der Durchströmungsgeschwindigkeit des Kühlwassers ist der Zylinderkopfkühlraum 2 im Bereich der Brennraumkalotte 36 und der Ein- und Auslassventile mit einer im wesentlichen einheitlichen Stärke bzw. Dicke ausgebildet, die zwischen 3 und 7 mm beträgt.To increase the flow rate of the cooling water, the cylinder head cooling chamber 2 is formed in the area of the combustion chamber cap 36 and the inlet and exhaust valves with a substantially uniform thickness or thickness, which is between 3 and 7 mm.
Durch die zuvor geschilderten Maßnahmen können die aufgrund des hohen Wärmeeintrags auf die Zündkerze und die Ventilsitzringe in diesem Bereich verursachten Temperaturspitzen wirkungsvoll abgebaut werden.The measures described above can be used to effectively reduce the temperature peaks caused by the high heat input to the spark plug and the valve seat rings in this area.
Die Strömungsquerschnitte auf der Einströmseite des Zylinderkopfkühlraumes 2 sind so ausgebildet, dass der Kühlwasserstrom in einen Hauptkühlstrom Qi, Q2 und Q3 sowie in zwei Nebenkühlströme Q4 und Q5 aufteilt ist. Der Hauptkühlstrom Qi, Q2 und Q3 wird zwischen die beiden Auslassventile (Ausnehmung 10, 12) in Richtung des Zündkerzendomes (zentrale Öffnung 14) geführt, während im jeweils linken und rechten Randbereich des Zylinderkopfkühlraumes 2 die Nebenkühlströme Q4 und Q5 verlaufen. Die bereits eingangs erwähnten Aussparungen 23, 24 bilden Verengungen für die beiden Nebenkühlströme Q und Q5, so dass der gesamte Kühlwasserstrom bspw. so aufgeteilt ist, dass 50% davon über den Hauptkühlstrom Qi, Q2 und Q3 zwischen den beiden Auslassventilen in Richtung des Zündkerzendomes geführt sind, während jeweils 25% davon über die Nebenkühlströme Q4 und Q5 dem linken und dem rechten Randbereich des Zylinderkopfkühlraumes zugeführt sind. The flow cross sections on the inflow side of the cylinder head cooling space 2 are designed such that the cooling water flow is divided into a main cooling flow Qi, Q 2 and Q 3 and two secondary cooling flows Q 4 and Q 5 . The main cooling flow Qi, Q 2 and Q 3 is conducted between the two exhaust valves (recess 10, 12) in the direction of the spark plug dome (central opening 14), while the secondary cooling flows Q 4 and Q 5 run in the left and right edge areas of the cylinder head cooling chamber 2. The cutouts 23, 24 mentioned at the beginning form constrictions for the two secondary cooling flows Q and Q 5 , so that the entire cooling water flow is divided, for example, in such a way that 50% of it flows in the direction of the main cooling flow Qi, Q 2 and Q 3 between the two exhaust valves of the spark plug dome are guided, while 25% of each are supplied via the secondary cooling flows Q 4 and Q 5 to the left and right edge regions of the cylinder head cooling chamber.

Claims

Patentansprüche claims
1. Wassergekühlter Zylinderkopf für eine mehrzylindrige Brennkraftmaschine mit zwei Ein- und Auslassventilen pro Zylinder, einem im Zylinderkopfgehäuse (4) integrierten Zylinderkopfkühlraum (2) (Wassermantel) mit Ein- und Ausströmöffnungen (6, 8) für das Kühlmittel, der sich oberhalb einer die Brennraummulde (20) bildenden Kalotte (36) erstreckt, wobei um eine zentral im Zylinderkopfgehäuse (4) angeordnete Aufnahmeöffnung (14) für eine Zündkerze und um die beiden Auslassventile zumindest bereichsweise Wassermantelräume (26, 28, 30) ausgebildet sind, die über einen gemeinsamen Ringraumabschnitt (32) miteinander verbunden sind, dadurch gekennzeichnet, dass zumindest der gemeinsame Wassermantel- Ringraumabschnitt (32) zur Brennraummulde (20) hin eine im wesentlichen gleich bleibende Höhe aufweist, so dass zumindest in diesem Bereich die Wandstärke (a) der Brennraumkalotte (36) einheitlich und bis dicht an die Brennraummulde (20) herangeführt ist.1.Water-cooled cylinder head for a multi-cylinder internal combustion engine with two intake and exhaust valves per cylinder, a cylinder head cooling chamber (2) (water jacket) integrated in the cylinder head housing (4) with inlet and outlet openings (6, 8) for the coolant, which is above one of the Dome (36) forming the combustion chamber trough (20), water jacket spaces (26, 28, 30), which are formed over a common one, at least in regions around a receiving opening (14) for a spark plug arranged centrally in the cylinder head housing (4) and around the two exhaust valves Annulus section (32) are connected to one another, characterized in that at least the common water jacket annulus section (32) towards the combustion chamber trough (20) has a substantially constant height, so that at least in this area the wall thickness (a) of the combustion chamber cap (36 ) is brought uniformly and up to the combustion chamber trough (20).
2. Wassergekühlter Zylinderkopf nach Anspruch 1, dadurch gekennzeichnet, dass der Durchmesser der Aufnahmeöffnung (14) für die Zündkerze auf der Höhe des gemeinsamen Ringraumabschnittes (32) reduziert ist.2. Water-cooled cylinder head according to claim 1, characterized in that the diameter of the receiving opening (14) for the spark plug is reduced at the level of the common annular space section (32).
3. Wassergekühlter Zylinderkopf nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Wandstärke der Brennraumkalotte (36) im Bereich des Ringraumabschnittes (32) auf zwischen 5 und 11 mm reduziert ist.3. Water-cooled cylinder head according to claim 1 or 2, characterized in that the wall thickness of the combustion chamber cap (36) in the region of the annular space section (32) is reduced to between 5 and 11 mm.
4. Wassergekühlter Zylinderkopf nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass auf der Einströmseite des Kühlwassers zusätzlich ein Kühlkanal (34) vorgesehen ist, der den gemeinsamen Ringraumabschnitt (32) auf direktem Weg zusätzlich mit Kühlwasser versorgt. 4. Water-cooled cylinder head according to one of the preceding claims, characterized in that a cooling channel (34) is additionally provided on the inflow side of the cooling water, which also supplies the common annular space section (32) directly with cooling water.
5. Wassergekühlter Zylinderkopf nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Wassermantel im Bereich der Brennraumkalotte (36) und der Ein- und Auslasskanäle eine im wesentlichen einheitliche Stärke aufweist, die zwischen 3 und 7 mm beträgt.5. Water-cooled cylinder head according to one of the preceding claims, characterized in that the water jacket in the region of the combustion chamber calotte (36) and the inlet and outlet channels has a substantially uniform thickness, which is between 3 and 7 mm.
6. Wassergekühlter Zylinderkopf nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass auf der Einströmseite (Einströmöffnung 6) in den Zylinderkopfkühlraum (2) ein Hauptkühlstrom (Qi, Q2, Q3) zwischen den beiden Auslassventilen (Ausnehmung 10, 12) in Richtung der Aufnahmeöffnung (14) für die Zündkerze verläuft, während an den beiden Randbereichen des Zylinderkopfkühlraumes (2) zwei Nebenkühlströme (Q , Q5) vorgesehen sind.6. Water-cooled cylinder head according to one of the preceding claims, characterized in that on the inflow side (inflow opening 6) into the cylinder head cooling chamber (2) a main cooling flow (Qi, Q2, Q 3 ) between the two exhaust valves (recess 10, 12) in the direction of Receiving opening (14) for the spark plug extends, while two secondary cooling flows (Q, Q 5 ) are provided on the two edge regions of the cylinder head cooling chamber (2).
7. Wassergekühlter Zylinderkopf nach Anspruch 6, dadurch gekennzeichnet, dass in den beiden Randbereichen des Zylinderkopfkühlraumes (2) lokale Verengungen zur Drosselung der beiden Nebenkühlströme ( ) vorgesehen sind. 7. Water-cooled cylinder head according to claim 6, characterized in that local constrictions for throttling the two secondary cooling flows () are provided in the two edge regions of the cylinder head cooling chamber (2).
EP05726208A 2004-03-27 2005-03-15 Water-cooled cylinder head for a multi-cylinder internal combustion engine Active EP1733132B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004015134A DE102004015134A1 (en) 2004-03-27 2004-03-27 Water-cooled cylinder head for a multi-cylinder internal combustion engine
PCT/EP2005/002723 WO2005093242A1 (en) 2004-03-27 2005-03-15 Water-cooled cylinder head for a multi-cylinder internal combustion engine

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WO (1) WO2005093242A1 (en)

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EP1733132B1 (en) 2011-11-02
DE102004015134A1 (en) 2005-10-13
JP2007530851A (en) 2007-11-01
US20060054112A1 (en) 2006-03-16
US7128029B2 (en) 2006-10-31
WO2005093242A1 (en) 2005-10-06

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