WO2005001268A1 - Cylinder head for a multi-cylinder water-cooled reciprocating piston combustion engine - Google Patents

Cylinder head for a multi-cylinder water-cooled reciprocating piston combustion engine Download PDF

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Publication number
WO2005001268A1
WO2005001268A1 PCT/EP2004/006717 EP2004006717W WO2005001268A1 WO 2005001268 A1 WO2005001268 A1 WO 2005001268A1 EP 2004006717 W EP2004006717 W EP 2004006717W WO 2005001268 A1 WO2005001268 A1 WO 2005001268A1
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WO
WIPO (PCT)
Prior art keywords
cylinder head
cylinder
area
cooling water
longitudinal direction
Prior art date
Application number
PCT/EP2004/006717
Other languages
German (de)
French (fr)
Inventor
Werner Huhn
Hubertus Paul Janocha
Jürgen Schwarz
Jan Stotz
Wolf Zimmermann
Original Assignee
Daimlerchrysler Ag
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Application filed by Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2005001268A1 publication Critical patent/WO2005001268A1/en

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Classifications

    • 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
    • F01P3/14—Arrangements for cooling other engine or machine parts for cooling intake or exhaust valves
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • 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
    • 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
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • 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 cylinder head for a multi-cylinder, water-cooled reciprocating internal combustion engine according to the preamble of claim 1.
  • a cylinder head for a water-cooled internal combustion engine which has two exhaust valves lying next to each other in the longitudinal direction and two intake valves.
  • the cooling water is supplied to the cylinder head on the exhaust valve side from a first longitudinal channel of the cylinder housing via an inflow channel which is elongated in the longitudinal direction.
  • the cooling water flows from the exhaust side across the cylinder head into a second longitudinal channel of the cylinder housing on the intake side.
  • control measures are provided for the targeted cooling water flow and cooling of the hot spot on the wall of the cylinder head.
  • the control measures consist on the one hand of a guide rib through which the cooling water flow is directed towards a combustion chamber roof of the cylinder head, and on the other hand of two spaced-apart locking ribs that run symmetrically on both sides of the guide rib and limit the flow in the longitudinal direction of the cylinder head, so that the cooling water flow is conducted outside the outlet channels to the inlet channels.
  • a liquid-cooled internal combustion engine with at least one cylinder and a cylinder head which has an outlet channel provided with at least one outlet valve and an inlet channel provided with at least one inlet valve.
  • the outlet channel is at least partially surrounded by a first cooling line, which is connected to a cooling jacket of a cylinder housing via a passage opening.
  • the coolant flow flows around a centrally located spark plug pipe and is distributed over a second cooling line that surrounds the spark plug and a third cooling line that surrounds the inlet duct.
  • the invention is based on the object of improving the heat transfer from the cylinder head to the cooling water in the region of the exhaust valves, preferably their valve seats. It is solved according to the invention by the features of claim 1. A further advantageous embodiment results from the subclaim.
  • an inflow channel of the cooling water turns from an area that adjoins a cylinder head gasket and extends perpendicular to the latter via a gentle bend of approximately 65 ° to a web bore. This is located in a web in a valve seat area between the outlet channels. At least in of the bend, the inflow channel has a small radial height, but it is expedient that the parts of the inflow channel adjoining the bend are also designed to be flat so that the flow does not detach from the walls of the inflow channel. This goal is also supported by the gentle course of the bend.
  • the width of the inflow channel in the longitudinal direction of the row of cylinders is dimensioned and designed by laterally arranged, inwardly projecting ribs such that the cooling water flow covers an area of the valve seat area of the outlet channels, which, with an area of the adjacent outlet channel symmetrical to the transverse center plane, a funnel tapering towards the web bore forms, flows from the front.
  • the inflow channel designed in this way in connection with the ribs on the side ensures that the cooling water flow in the immediate vicinity of the combustion chamber roof flows at high speed between the outlet channels and thus ensures good heat transfer and good cooling of these thermally highly stressed zones.
  • the limited width of the inflow channel and the flanking, projecting ribs ensure that sufficient back pressure builds up in front of the web bore. A wider opening would no longer provide a mass flow of cooling water, but would only accommodate the pressure loss because the flow to the web bore would be negatively affected by the mass flow flowing to the combustion chamber roof sides.
  • the two projecting ribs focus the flow in the direction of the web bore in such a way that the cooling water expediently flows towards a region of 90 ° of the valve seat area in front of the web bore.
  • the flow of the cooling water separates from the protruding one Cooling fin and creates a backflow that creates a circulation in the dead space behind the fin. This has the effect that the flow on the side of the outlet channel increasingly attaches to it.
  • an increased speed of the cooling water and thus an improved heat transfer is achieved in the vicinity of the wall area.
  • the measure counteracts detachment of the cooling water flow from the wall of the gas exchange channels, so that a larger peripheral area of the gas exchange channels is intensively cooled in the area of the valve seat rings.
  • 1 is a view of a water jacket of a cylinder head in the direction from above from the direction of the exhaust valves
  • FIG. 2 cut a water jacket of FIG. 1 in the middle
  • Fig. 3 shows a cooling water flow in the valve seat area of the exhaust valves.
  • the cylinder head 10 has two exhaust ducts 12 lying side by side in the longitudinal direction 11. These form a web 14 between them in a valve seat area 13 and are controlled by exhaust valves (not shown) which are guided in the cylinder head 10.
  • a spark plug area 17 for a centrally arranged spark plug, not shown.
  • the cooling water is supplied to the cylinder head 10 from a cylinder housing via an inflow duct 16, the inflow duct 16 having a gentle bend 20 between a part running perpendicular to a cylinder head gasket and a web bore 15 in the web 14, which bend extends over an angular range of approximately 65 ° extends (Fig. 2).
  • the gentle bend 20 in connection with a small radial height of the inflow channel 16 has the effect that the cooling water flow does not detach from the wall of the cylinder head 10 which faces the combustion chamber roof 30, but rather flows over it at high speed.
  • the flat inflow channel 16 also enables an optimal arrangement of secondary air bores, which may have to be provided in the cylinder head.
  • the flow rate of the cooling water is accelerated towards the web bore 15, since the flow cross section tapers through the arrangement of the outlet valves 12 in the form of a funnel 22. So that the dynamic pressure in front of the web bore 15 does not decrease in an uncontrolled manner, in which the cooling water flows laterally over the combustion chamber roof into the upper region of the cylinder head 10, the width 19 of the inflow channel 16 in the longitudinal direction 11 of the cylinder bank is dimensioned such that the cooling water flow in a region 23 of the valve seat region 13 upstream of the web 15. This is supported by inwardly projecting ribs 21, which focus the cooling water flow onto the web bore 15 and thus increase the dynamic pressure in front of the web bore 15.
  • the cooling water passes through the area 18 of the inlet ducts and corresponding connection ducts 28 to a cooling water collecting duct on the long side of the row of cylinders.
  • spatial coordinates 29 are indicated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a cylinder head (10) for a multi-cylinder water-cooled reciprocating piston combustion engine comprising, on a longitudinal side of a row of cylinders, two exhaust valves that are adjacent in the longitudinal direction and, on the other longitudinal side, at least one admission valve, and coolant is fed to the cylinder head from a cylinder housing via an in-flow port (16). Said in-flow port (16) extends in a manner that is essentially symmetric to a transversal center plane of the cylinder head (10), said transversal center plane running between the exhaust valves, and has an elongated cross-section in the longitudinal direction of the row of cylinders. The coolant transversally flows from the in-flow port (16) on the side of the exhaust valves through the cylinder head (10) to a coolant collecting port (27) on the side of the admission valves. The invention provides that the in-flow port (16) from an area, which adjoins a cylinder head seal while running perpendicular thereto, turns over a smooth curve of approximately sixty-five degrees toward a web boring, which is located in a valve seat area (13) between the exhaust ports (12), and comprises, at least in the curve, a short radial height, whereby for its width (19) in the longitudinal direction of the row of cylinders, is dimensioned and formed with laterally arranged inwardly projecting ribs (21) in such a manner that the flow of coolant flows head-on against an area of the valve seat area (13) that, together with an area of the adjacent exhaust port, said area being symmetric to the transversal center plane, forms a funnel (22) that tapers toward the web boring.

Description

DaimlerChrysler AG DaimlerChrysler AG
Zylinderkopf für eine mehrzylindrige, wassergekühlte HubkolbenbrennkraftmaschineCylinder head for a multi-cylinder, water-cooled reciprocating internal combustion engine
Die Erfindung betrifft einen Zylinderkopf für eine mehrzylindrige- wassergekühlte Hubkolbenbrennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a cylinder head for a multi-cylinder, water-cooled reciprocating internal combustion engine according to the preamble of claim 1.
Aus der DE 199 43 003 Cl ist ein Zylinderkopf für eine wassergekühlte Brennkraftmaschine bekannt, der zwei in Längsrichtung nebeneinander liegende Auslassventile und zwei Einlassventile aufweist. Das Kühlwasser wird dem Zylinderkopf auf der Seite der Auslassventile von einem ersten Längskanal des Zylindergehäuses über einen Einströmkanal zugeführt, der in Längsrichtung länglich ausgebildet ist. Das Kühlwasser strömt von der Auslassseite quer durch den Zylinderkopf in einen zweiten Längskanal des Zylindergehäuses auf der Einlassseite. Im Kühlkanal zwischen den beiden Längskanälen sind Steuervorkehrungen für die gezielte Kühlwasserströmung und Kühlung der Heißstelle an der Wand des Zylinderkopfs vorgesehen. Die Steuervorkehrungen bestehen einerseits aus einer Leitrippe, durch die die Kühlwasserströmung in Richtung auf ein Brennraumdach des Zylinderkopfs gelenkt wird, und zum anderen aus zwei mit Abstand zueinander angeordnete Sperrrippen, die symmetrisch beiderseits der Leitrippe verlaufen und den Durchfluss in Längsrichtung des Zylinderkopfs begrenzen, so dass die Kühlwasserströmung außen an den Auslasskanälen zu den Einlasskanälen vorbeigeführt wird.From DE 199 43 003 Cl a cylinder head for a water-cooled internal combustion engine is known, which has two exhaust valves lying next to each other in the longitudinal direction and two intake valves. The cooling water is supplied to the cylinder head on the exhaust valve side from a first longitudinal channel of the cylinder housing via an inflow channel which is elongated in the longitudinal direction. The cooling water flows from the exhaust side across the cylinder head into a second longitudinal channel of the cylinder housing on the intake side. In the cooling channel between the two longitudinal channels, control measures are provided for the targeted cooling water flow and cooling of the hot spot on the wall of the cylinder head. The control measures consist on the one hand of a guide rib through which the cooling water flow is directed towards a combustion chamber roof of the cylinder head, and on the other hand of two spaced-apart locking ribs that run symmetrically on both sides of the guide rib and limit the flow in the longitudinal direction of the cylinder head, so that the cooling water flow is conducted outside the outlet channels to the inlet channels.
Aus der DE 198 02 060 AI ist ein flüssigkeitsgekühlter Zylinderkopf einer mehrzylindrigen, je Zylinder mehrven- tiligen Brennkraftmaschine bekannt. Im Zylinderkopf ist längsseitig eine Längskanal mit quer abgerichteten Leitrippen angeordnet. Diese leiten die Kühlflüssigkeitsströ- mung zwischen den in Längsrichtung nebeneinander angeordneten Gaswechselventilen in Richtung auf eine Zündkerzenpfeife, die vom Kühlmittel umströmt wird. Weitere Durchbrechungen des Längskanals zur Innenseite des Zylinderkopfs sorgen für eine weitere Querströmung durch den Zylinderkopf und eine Umströmung der Gaswechselkanäle.DE 198 02 060 AI describes a liquid-cooled cylinder head of a multi-cylinder, multi-cylinder per cylinder tiligen internal combustion engine known. A longitudinal channel with transversely oriented guide ribs is arranged on the long side in the cylinder head. These direct the coolant flow between the gas exchange valves arranged next to one another in the longitudinal direction in the direction of a spark plug pipe, around which the coolant flows. Further openings in the longitudinal channel to the inside of the cylinder head ensure a further cross flow through the cylinder head and flow around the gas exchange channels.
Aus der DE 199 34 667 AI ist eine flüssigkeitsgekühlte Brennkraftmaschine mit wenigstens einem Zylinder und einem Zylinderkopf bekannt, der einen mit wenigstens einem Auslassventil versehenen Auslasskanal und einen mit wenigstens einem Einlassventil versehenen Einlasskanal aufweist. Der Auslasskanal wird zumindest abschnittsweise von einer ersten Kühlleitung umgeben, die über eine Durchtrittsöffnung mit einem Kühlmantel eines Zylindergehäuses in Verbindung steht. Der Kühlmittelstrom umströmt eine zentral angeordnete Zündkerzenpfeife und verteilt sich dabei auf eine zweite Kühlleitung, die die Zündkerze umgibt und eine dritte Kühlleitung, die den Einlaßkanal umgibt .From DE 199 34 667 AI a liquid-cooled internal combustion engine with at least one cylinder and a cylinder head is known, which has an outlet channel provided with at least one outlet valve and an inlet channel provided with at least one inlet valve. The outlet channel is at least partially surrounded by a first cooling line, which is connected to a cooling jacket of a cylinder housing via a passage opening. The coolant flow flows around a centrally located spark plug pipe and is distributed over a second cooling line that surrounds the spark plug and a third cooling line that surrounds the inlet duct.
Der Erfindung liegt die Aufgabe zu Grunde, den Wärmeübergang vom Zylinderkopf auf das Kühlwasser im Bereich der Auslassventile, vorzugsweise ihrer Ventilsitze zu verbessern. Sie wird gemäß der Erfindung durch die Merkmale des Anspruchs 1 gelöst. Eine weitere vorteilhafte Ausgestaltung ergibt sich aus dem Unteranspruch.The invention is based on the object of improving the heat transfer from the cylinder head to the cooling water in the region of the exhaust valves, preferably their valve seats. It is solved according to the invention by the features of claim 1. A further advantageous embodiment results from the subclaim.
Nach der Erfindung wendet sich ein Einströmkanal des Kühlwassers von einem Bereich, der sich an eine Zylinderkopfdichtung anschließt und zu dieser senkrecht verläuft über eine sanfte Biegung von etwa 65° einer Stegbohrung zu. Diese befindet sich in einem Steg in einem Ventilsitzbereich zwischen den Auslasskanälen. Mindestens in der Biegung besitzt der Einströmkanal eine geringe radiale Höhe, jedoch ist es zweckmäßig, dass die an die Biegung angrenzenden Teile des Einströmkanals ebenfalls flach ausgebildet sind, damit sich die Strömung nicht von den Wänden des Einströmkanals ablöst. Dieses Ziel wird e- benfalls durch den sanften Verlauf der Biegung unterstützt .According to the invention, an inflow channel of the cooling water turns from an area that adjoins a cylinder head gasket and extends perpendicular to the latter via a gentle bend of approximately 65 ° to a web bore. This is located in a web in a valve seat area between the outlet channels. At least in of the bend, the inflow channel has a small radial height, but it is expedient that the parts of the inflow channel adjoining the bend are also designed to be flat so that the flow does not detach from the walls of the inflow channel. This goal is also supported by the gentle course of the bend.
Die Breite des Einströmkanals in Längsrichtung der Zylinderreihe ist so bemessen und durch seitlich angeordnete, nach innen vorspringende Rippen gestaltet, dass die Kühlwasserströmung einen Bereich des Ventilsitzbereichs der Auslasskanäle, der mit einem symmetrisch zur Quermittelebene liegenden Bereich des benachbarten Auslasskanals einen sich zur Stegbohrung hin verjüngenden Trichter bildet, frontal anströmt.The width of the inflow channel in the longitudinal direction of the row of cylinders is dimensioned and designed by laterally arranged, inwardly projecting ribs such that the cooling water flow covers an area of the valve seat area of the outlet channels, which, with an area of the adjacent outlet channel symmetrical to the transverse center plane, a funnel tapering towards the web bore forms, flows from the front.
Durch den so gestalteten Einströmkanal in Verbindung mit den seitlichen Rippen erreicht man, dass die Kühlwasserströmung in unmittelbarer Nähe zum Brennraumdach mit hoher Geschwindigkeit zwischen die Auslasskanäle strömt und somit für einen guten Wärmeübergang und für eine gute Kühlung dieser thermisch hochbelasteten Zonen sorgt. Gleichzeitig bewirkt die begrenzte Breite des Einströmkanals sowie die flankierenden, vorspringenden Rippen, dass sich vor der Stegbohrung ein ausreichender Staudruck aufbaut. Eine breitere Öffnung würde nicht mehr Massenstrom des Kühlwassers liefern, sondern nur dem Druckverlust entgegenkommen, weil der Strömungsverlauf zur Stegbohrung empfindlich negativ durch den zu den Brennraumdachseiten hin abfließenden Massenstrom beeinflusst würde.The inflow channel designed in this way in connection with the ribs on the side ensures that the cooling water flow in the immediate vicinity of the combustion chamber roof flows at high speed between the outlet channels and thus ensures good heat transfer and good cooling of these thermally highly stressed zones. At the same time, the limited width of the inflow channel and the flanking, projecting ribs ensure that sufficient back pressure builds up in front of the web bore. A wider opening would no longer provide a mass flow of cooling water, but would only accommodate the pressure loss because the flow to the web bore would be negatively affected by the mass flow flowing to the combustion chamber roof sides.
Die zwei vorspringenden Rippen fokussieren die Strömung in Richtung auf die Stegbohrung so, dass zweckmäßigerweise ein Bereich von 90° des Ventilsitzbereichs vor der Stegbohrung vom Kühlwasser frontal angeströmt wird. Die Strömung des Kühlwassers löst sich von der vorspringenden Kühlrippe ab und erzeugt eine Rückströmung, die eine Zirkulation in dem Totraum hinter der Rippe erzeugt. Diese bewirkt, dass sich die Strömung auf der Seite des Auslasskanals vermehrt an diesen anlegt. Dadurch wird in Nähe des Wandbereichs eine erhöhte Geschwindigkeit des Kühlwassers und damit ein verbesserte Wärmeübergang erreicht. Ferner wirkt die Maßnahme einer Ablösung der Kühlwasserströmung von der Wand der Gaswechselkanäle entgegen, so dass ein größerer Umfangsbereich der Gaswechselkanäle im Bereich der Ventilsitzringe intensiv gekühlt wird.The two projecting ribs focus the flow in the direction of the web bore in such a way that the cooling water expediently flows towards a region of 90 ° of the valve seat area in front of the web bore. The flow of the cooling water separates from the protruding one Cooling fin and creates a backflow that creates a circulation in the dead space behind the fin. This has the effect that the flow on the side of the outlet channel increasingly attaches to it. As a result, an increased speed of the cooling water and thus an improved heat transfer is achieved in the vicinity of the wall area. Furthermore, the measure counteracts detachment of the cooling water flow from the wall of the gas exchange channels, so that a larger peripheral area of the gas exchange channels is intensively cooled in the area of the valve seat rings.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages result from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.
Dabei zeigen:Show:
Fig. 1 eine Ansicht eines Wassermantels eines Zylinderkopfs in Richtung von oben aus der Richtung der Auslassventile,1 is a view of a water jacket of a cylinder head in the direction from above from the direction of the exhaust valves,
Fig. 2 einen Wassermantel nach Fig. 1 mittig aufgeschnitten undFig. 2 cut a water jacket of FIG. 1 in the middle and
Fig. 3 eine Kühlwasserströmung im Ventilsitzbereich der Auslassventile .Fig. 3 shows a cooling water flow in the valve seat area of the exhaust valves.
Von einer Zylinderreihe einer Hubkolbenbrennkraftmaschine, deren Längsrichtung mit 11 bezeichnet ist, ist ein Zylinderkopf 10 dargestellt, und zwar der Wassermantel, soweit es für das Verständnis der Erfindung erforderlich ist . Der Zylinderkopf 10 besitzt zwei in Längsrichtung 11 nebeneinander liegende Auslasskanäle 12. Diese bilden zwischen sich in einem Ventilsitzbereich 13 einen Steg 14 und werden durch nicht dargestellte Auslassventile gesteuert, die im Zylinderkopf 10 geführt sind. An der zur Längsrichtung 11 gegenüber liegenden Seite befindet sich ein Bereich 18 der Einlasskanäle, die nicht näher dargestellt sind, da sich die vorliegende Erfindung nur auf die Kühlung der Bereiche um die Auslasskanäle 12 bezieht. Zwischen dem Bereich 18 der Einlasskanäle und den Auslasskanälen 12 befindet sich ein Zündkerzenbereich 17 für eine zentral angeordnete nicht dargestellte Zündkerze.A cylinder head 10 of a row of cylinders of a reciprocating piston internal combustion engine, the longitudinal direction of which is designated by 11, is shown, namely the water jacket, insofar as it is necessary for an understanding of the invention. The cylinder head 10 has two exhaust ducts 12 lying side by side in the longitudinal direction 11. These form a web 14 between them in a valve seat area 13 and are controlled by exhaust valves (not shown) which are guided in the cylinder head 10. On the side opposite the longitudinal direction 11 there is an area 18 of the inlet channels, which are not shown in detail, since the present invention relates only to the cooling of the areas around the outlet channels 12. Between the area 18 of the inlet channels and the outlet channels 12 there is a spark plug area 17 for a centrally arranged spark plug, not shown.
Das Kühlwasser wird dem Zylinderkopf 10 von einem Zylindergehäuse über einen Einströmkanal 16 zugeführt, wobei der Einströmkanal 16 zwischen einem senkrecht zu einer Zylinderkopfdichtung verlaufenden Teil und einer Stegbohrung 15 im Steg 14 eine sanfte Biegung 20 aufweist, die sich über einen Winkelbereich von ca. 65° erstreckt (Fig. 2) . Die sanfte Biegung 20 in Verbindung mit einer geringen radialen Höhe des Einströmkanals 16 bewirkt, dass sich die Kühlwasserströmung nicht von der Wand des Zylinderkopfs 10 ablöst, die dem Brennraumdach 30 zugewandt ist, sondern sie mit hoher Geschwindigkeit überströmt. Der flache Einströmkanal 16 ermöglicht ferner eine optimale Anordnung von Sekundärluftbohrungen, die eventuell im Zylinderkopf vorzusehen sind.The cooling water is supplied to the cylinder head 10 from a cylinder housing via an inflow duct 16, the inflow duct 16 having a gentle bend 20 between a part running perpendicular to a cylinder head gasket and a web bore 15 in the web 14, which bend extends over an angular range of approximately 65 ° extends (Fig. 2). The gentle bend 20 in connection with a small radial height of the inflow channel 16 has the effect that the cooling water flow does not detach from the wall of the cylinder head 10 which faces the combustion chamber roof 30, but rather flows over it at high speed. The flat inflow channel 16 also enables an optimal arrangement of secondary air bores, which may have to be provided in the cylinder head.
Die Strömungsgeschwindigkeit des Kühlwassers wird zur Stegbohrung 15 hin beschleunigt, da sich der Strömungsquerschnitt durch die Anordnung der Auslassventile 12 in Form eines Trichters 22 verjüngt. Damit sich der Staudruck vor der Stegbohrung 15 nicht unkontrolliert verringert, in dem das Kühlwasser seitlich über das Brennraumdach in den oberen Bereich des Zylinderkopfs 10 abströmt, ist die Breite 19 des Einströmkanals 16 in Längsrichtung 11 der Zylinderreihe so bemessen, dass die Kühlwasser- strömung in einem Bereich 23 des Ventilsitzbereichs 13 vor dem Steg 15 frontal angeströmt wird. Dies wird durch nach innen vorspringende Rippen 21 unterstützt, die den Kühlwasserstrom auf die Stegbohrung 15 fokussieren und somit den Staudruck vor der Stegbohrung 15 erhöhen. Ferner lenken sie den Kühlwasserstrom dicht an die äußeren Wände der Auslasskanäle 12 und erzeugen in einem Totraum 24 hinter der Rippe 21 eine Rückströmung 25, die den Kühlmittelstrom vermehrt an die Wände der Auslasskanäle 12 verdrängt und dadurch beschleunigt. Ferner wird erreicht, dass die Kühlwasserströmung möglichst lange an der Wand des Auslasskanals 12 anliegt und diesen intensiv kühlt. Der Vorgang wird durch eine Verengung 26 im Bereich hinter der Rückströmung 25 begünstigt (Fig. 3).The flow rate of the cooling water is accelerated towards the web bore 15, since the flow cross section tapers through the arrangement of the outlet valves 12 in the form of a funnel 22. So that the dynamic pressure in front of the web bore 15 does not decrease in an uncontrolled manner, in which the cooling water flows laterally over the combustion chamber roof into the upper region of the cylinder head 10, the width 19 of the inflow channel 16 in the longitudinal direction 11 of the cylinder bank is dimensioned such that the cooling water flow in a region 23 of the valve seat region 13 upstream of the web 15. This is supported by inwardly projecting ribs 21, which focus the cooling water flow onto the web bore 15 and thus increase the dynamic pressure in front of the web bore 15. Furthermore, they direct the cooling water flow close to the outer walls of the outlet channels 12 and generate a backflow 25 in a dead space 24 behind the rib 21, which increasingly displaces the coolant flow to the walls of the outlet channels 12 and thereby accelerates them. It is also achieved that the cooling water flow bears against the wall of the outlet channel 12 for as long as possible and cools it intensively. The process is favored by a constriction 26 in the area behind the backflow 25 (FIG. 3).
Durch die erfindungsgemäße Gestaltung werden insbesondere die einander zugewandten Bereiche der Auslasskanäle 12 durch eine beschleunigte Kühlwasserströmung und einen vergrößerten Umfangsbereich des Ventilsitzbereichs 13 verbessert, an dem die Kühlwasserströmung an den Wänden der Auslasskanäle 12 anliegt.As a result of the design according to the invention, in particular the regions of the outlet channels 12 facing one another are improved by an accelerated cooling water flow and an enlarged peripheral region of the valve seat region 13, against which the cooling water flow rests on the walls of the outlet channels 12.
Nach dem Umströmen der Auslasskanäle 12 gelangt das Kühlwasser über den Bereich 18 der Einlasskanäle und entsprechende Verbindungskanäle 28 zu einem Kuhlwassersammelkanal an der Längsseite der Zylinderreihe. Zum besseren Verständnis der Darstellung nach Fig. 2 sind räumlichen Koordinaten 29 angedeutet. After the flow around the outlet ducts 12, the cooling water passes through the area 18 of the inlet ducts and corresponding connection ducts 28 to a cooling water collecting duct on the long side of the row of cylinders. For a better understanding of the representation according to FIG. 2, spatial coordinates 29 are indicated.

Claims

DaimlerChrysler AGDaimlerChrysler AG
Patentansprücheclaims
Zylinderkopf für eine mehrzylindrige, wassergekühlte Hubkolbenbrennkraftmaschine, der an einer Längsseite einer Zylinderreihe je Zylinder zwei in Längsrichtung nebeneinander liegende Auslassventile und an der anderen Längsseite mindestens ein Einlassventil aufweist und dem von einem Zylindergehäuse Kühlwasser ü- ber einen Einströmkanal zugeführt wird, wobei sich der Einströmkanal im Wesentlichen symmetrisch zu einer zwischen den Auslassventilen verlaufenden Quermittelebene des Zylinderkopfs erstreckt und einen in Längsrichtung der Zylinderreihe länglichen Querschnitt besitzt und das Kühlwasser von dem Einströmkanal auf der Seite der Auslassventile quer durch den Zylinderkopf zu einem Kuhlwassersammelkanal auf der Seite der Einlassventile strömt, dadurch gekennzeichnet, dass der Einströmkanal (16) von einem Bereich, der sich an eine Zylinderkopfdichtung anschließt und zu dieser senkrecht verläuft, über eine sanfte Biegung (20) von etwa fünfundsechzig Grad einer Stegbohrung (15) in einem Ventilsitzbereich (13) zwischen den Auslasskanälen (12) zuwendet und mindestens in der Biegung eine geringe radiale Höhe besitzt, wobei seine Breite (19) in Längsrichtung (11) der Zylinderreihe so bemessen und durch seitlich angeordnete, nach innen vorspringende Rippen (21) gestaltet ist, dass die Kühlwasserströmung einen Bereich (23) des Ventilsitzbereichs (13) , der mit einem symmetrisch zur Quermittelebene liegenden Bereich (23) des benachbarten Auslasskanals (12) einen sich zur Stegbohrung (15) hin verjüngenden Trichter (22) bildet, frontal anströmt .Cylinder head for a multi-cylinder, water-cooled reciprocating internal combustion engine, which has two exhaust valves lying alongside each other in the longitudinal direction on one long side of a row of cylinders per cylinder and at least one intake valve on the other long side, and to which cooling water is supplied from a cylinder housing via an inflow channel, the inflow channel being located in the Extends essentially symmetrically to a transverse center plane of the cylinder head between the exhaust valves and has a cross section which is elongate in the longitudinal direction of the cylinder bank and the cooling water flows from the inflow channel on the side of the exhaust valves across the cylinder head to a cooling water collecting channel on the side of the intake valves, characterized in that the inflow channel (16) from a region which adjoins a cylinder head gasket and extends perpendicularly thereto, via a gentle bend (20) of approximately sixty-five degrees of a web bore (15) in a valve seat area (13) between the outlet channels (12) and at least in the bend has a small radial height, its width (19) in the longitudinal direction (11) of the row of cylinders being so dimensioned and laterally arranged inwards projecting ribs (21) is designed so that the cooling water flow is an area (23) of the valve seat area (13) which is symmetrical with a The region (23) of the adjacent outlet channel (12) lying transversely of the plane forms a funnel (22) which tapers towards the web bore (15) and flows from the front.
Zylinderkopf nach Anspruch 1, dadurch gekennzeichnet, dass der Bereich (23) sich über ca. neunzig Grad desCylinder head according to claim 1, characterized in that the area (23) extends over approximately ninety degrees of
Ventilsitzbereichs (13) erstreckt. Valve seat area (13) extends.
PCT/EP2004/006717 2003-06-26 2004-06-22 Cylinder head for a multi-cylinder water-cooled reciprocating piston combustion engine WO2005001268A1 (en)

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DE10328682.9 2003-06-26

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EP2388463B1 (en) * 2010-05-17 2012-05-16 Fiat Powertrain Technologies S.p.A. Cylinder head for an internal combustion engine, with integrated exhaust manifold

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JP2002213300A (en) * 2001-01-18 2002-07-31 Toyota Motor Corp Engine cooling structure and method of manufacturing for cooling water passage
US6481392B1 (en) * 1999-11-12 2002-11-19 Volvo Personvagner Ab Internal combustion engine

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US1793713A (en) * 1929-12-28 1931-02-24 Int Harvester Co Internal-combustion engine
DE832703C (en) * 1950-09-09 1952-02-28 E H Karl Maybach Dr Ing Fluid-cooled cylinder head for internal combustion engines, especially in motor vehicles
AT402325B (en) * 1990-02-13 1997-04-25 Avl Verbrennungskraft Messtech CYLINDER HEAD OF A LIQUID-COOLED INTERNAL COMBUSTION ENGINE WITH SERIES OF CYLINDERS

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US5720240A (en) * 1995-11-15 1998-02-24 Mercedes-Benz Ag Liquid cooled cylinder head
DE19608576C1 (en) * 1996-03-06 1997-06-19 Daimler Benz Ag Liquid cooled motor cylinder head
US6481392B1 (en) * 1999-11-12 2002-11-19 Volvo Personvagner Ab Internal combustion engine
JP2002213300A (en) * 2001-01-18 2002-07-31 Toyota Motor Corp Engine cooling structure and method of manufacturing for cooling water passage

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