EP0931925B1 - Liquid cooled cylinder head for a multi-cylinder , multi-valve internal combustion engine - Google Patents

Liquid cooled cylinder head for a multi-cylinder , multi-valve internal combustion engine Download PDF

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Publication number
EP0931925B1
EP0931925B1 EP98123345A EP98123345A EP0931925B1 EP 0931925 B1 EP0931925 B1 EP 0931925B1 EP 98123345 A EP98123345 A EP 98123345A EP 98123345 A EP98123345 A EP 98123345A EP 0931925 B1 EP0931925 B1 EP 0931925B1
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EP
European Patent Office
Prior art keywords
cylinder head
duct
gas
change
coolant
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.)
Expired - Lifetime
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EP98123345A
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German (de)
French (fr)
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EP0931925A3 (en
EP0931925A2 (en
Inventor
Rudolf Dr. Flierl
Uwe Brendel
Georg Malek
Norbert Dr. Deussen
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0931925A3 publication Critical patent/EP0931925A3/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
    • F02F1/42—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
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
    • F02F2001/246—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis and orientated radially from the combustion chamber surface
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the invention relates to a liquid-cooled cylinder head of a multi-cylinder, multi-valve per cylinder Internal combustion engine, with one between the outer walls of a cylinder head floor and a spaced top wall limited coolant space that for Cross-flow of coolant by means of a cylinder head screw connection between screw pipes provided transverse walls is divided into sections, with between Adjacent transverse walls are combined to form a collecting channel Gas exchange ducts are arranged directed to the respective outer wall, and in the middle of the gas exchange channels ending on the cylinder head, the top wall penetrating dome provided for a spark plug and / or an injection nozzle is.
  • Such a cylinder head is known for example from DE-C 38 38 953.
  • a disadvantage of this known cylinder head is the relatively large coolant space, being the velocity of the cross flow in each coolant compartment section via projections arranged on the transverse walls facing the central dome is determined, the flow edges arranged offset with respect to their height exhibit. These projections face the dome relatively close to the cathedral spaced flow edges on the other hand, on the cylinder head bottom side of the dome flow edges arranged far away to achieve a relatively large Flow cross section at moderate flow speed.
  • DE-C 196 08 576 shows and describes an exclusively crosswise flowed through cylinder head with each combustion chamber area assigned Coolant chamber section, the respective coolant chamber section for achieving a relatively high, turbulent flow rate relatively low is.
  • the invention has for its object to provide a generic cylinder head To design coolant chamber sections for cross flow so that the coolant guide serving elements for a turbulent flow in coolant compartment sections of medium height additionally increased rigidity of the cylinder head serve.
  • the cylinder head at least one from an inward to the cylinder head longitudinal center plane Section of the outer wall has limited longitudinal channel, which is further from a adjacent cylinder head bottom section and one with the outer wall section connecting longitudinal wall is formed, which of a gas exchange manifold interspersed longitudinal wall one upper and one below this collecting channel arranged opening and the respective cylinder head bottom lower, in cross-section depending on the distance from one single coolant inlet of the longitudinal channel selected opening with on free valve land area between separate, similar gas exchange channels
  • Directional guide ribs is connected, each with a bottom connection area of the respective gas exchange channel form a coolant passage, and that the upper opening above the collecting channel of the coolant supply formed between the respective gas exchange channel and the top wall Valve guides serves.
  • the cylinder head further contributes significantly to that Screw whistles between the top wall and the cylinder head floor about V-shaped walls with the longitudinal wall of the longitudinal channel in one piece Connected to form an oil return channel with one in the Cover wall provided inlet opening, the longitudinal wall bottom of the oil return channel adjacent overflow openings for the coolant the longitudinal channel.
  • overflow openings it is further ensured that coolant fractions of the neighboring, from a guide rib and the respective Gas exchange channel limited coolant passage are supplied with the advantage a partial flow around this gas exchange channel.
  • the longitudinal channel of a respective Gas exchange manifold so spaced from the cylinder head bottom portion is that the flow cross-section of the longitudinal channel over the Collective channel to the upper opening for cooling the valve guides relative to the flow cross section under the collecting duct to the lower opening as Throttle cross section serves.
  • the advantage of this configuration is that for the Guide ribs assigned an opening to the needs of the respective coolant compartment section corresponding amount of coolant over the slotted to rectangular designed opening can be fed.
  • One for influencing the flow speed in the transverse direction of the cylinder head advantageous embodiment is further achieved in that the separate gas exchange ducts of each longitudinal exchange gas exchange duct opposite gas exchange channels beyond the cathedral via a connected arrangement close to the floor on both sides to the transverse walls form directed coolant guide, and provided on the transverse walls Projections of the further coolant guide for cross-flow through the coolant chamber section serve, the free cross-sections between the connected Gas exchange channels and the transverse walls as well as the top wall as an outlet side Serve throttle.
  • This configuration advantageously enables in combination with a Another feature, according to which the longitudinal channel is connected at one end on the pump outlet side is, on the one hand, a supply of cold coolant at a relatively high speed and on the other hand an outflow of the cross flow at a higher temperature with turbulent flow.
  • the longitudinal channel is for a quick equalization of the temperature in the cylinder head advantageously interspersed on the outlet side with gas exchange outlet collecting ducts Cylinder head arranged.
  • the invention has been broken down on the basis of a section shown in the drawing described cylinder head described.
  • a liquid-cooled cylinder head 1 of a multi-cylinder, multi-valve per cylinder, Internal combustion engine, not shown, has a between outer walls 2 bounded by a cylinder head base 3 and a spaced top wall 4 Coolant chamber 5, the cross-flow of coolant by means of screw pipes 6 of a cylinder head screw connection provided transverse walls 7, 7 'in sections 8 is subdivided, each between adjacent transverse walls 7, 7 ' a collecting channel 9, 9 'combined similar gas exchange channels 10, 10' and 11, 11 'are arranged to run in the direction of the respective outer wall 2 and in the middle the gas exchange channels 10, 10 'or 11, 11' ending on the cylinder head side Top wall 4 penetrating dome 12 for a spark plug and / or an injection nozzle is provided.
  • the cylinder head 1 at least one of an inward limited to the cylinder head longitudinal center plane section 2 'of the outer wall 2 Longitudinal channel 13, which further from an adjacent cylinder head bottom portion 3 'and one connecting this to the outer wall section 2' Longitudinal wall 14 is formed, wherein the gas exchange manifold 9th interspersed longitudinal wall 14 one upper and one arranged below this collecting channel 9 Opening 15 and 16 has.
  • the cylinder head side lower, in cross-section depending on the distance from a single, selected coolant inlet of the longitudinal channel 13 on the pump outlet side Opening 16 with a free valve web area 17 between separate, Similar gas exchange channels 10, 10 'of the collecting channel 9 directed guide ribs 18, 18 'in connection, each with a bottom-side connection area of the respective gas exchange channel 10, 10 'form a coolant passage 19, 19'.
  • the upper opening 15 in the longitudinal wall 14 above the collecting channel 9 is used Applying coolant between the respective gas exchange duct 10, 10 'and the top wall 4 formed valve guides 20, 20 '.
  • Triangular to trapezoidal shaped longitudinal channel 13 is used for further stiffening of the cylinder head 1 further that the screw pipes 6 between the top wall 4 and the cylinder head base 3 arranged approximately V-shaped Walls 21 in one piece with the longitudinal wall 14 of the longitudinal channel 13 are to form an oil return channel 22 with one in the top wall 4 provided inlet opening 22 ', the longitudinal wall 14 on the bottom of the oil return channel 22 has adjacent overflow openings 23.
  • These overflow openings 23 serve on the one hand a partial coolant supply to the Coolant passages 19 and 19 'of the guide ribs 18 and 18' and the other one Cooling the oil return channel 22.
  • each coolant space section 8 For the targeted coolant distribution for each coolant space section 8 is the Longitudinal channel 13 of a respective gas exchange manifold 9 such from the cylinder head bottom section 3 'spaced through that the flow cross-section of the longitudinal channel 13 above the gas exchange manifold 9 to the upper opening 15 relative to the flow cross section under this collecting duct 9 lower opening 16 serves as a throttle cross section.
  • a throttle cross section With this configuration is ensures that relatively cool coolant is connected from the pump outlet side Longitudinal channel 13 targeted and hot in a corresponding amount Valve land area 17 between separate, similar gas exchange channels 10 and 10 'is supplied by means of the guide ribs 18 and 18'.
  • the upper opening 15 the longitudinal wall 14 is used to restrict the coolant Collecting channel 9 or the gas exchange channels 10, 10 'connected to them and in particular their valve guides 20, 20 '.
  • each coolant compartment section 8 the separate gas exchange channels 10, 10 'each arranged along the side channel gas exchange manifold 9 opposite Gas exchange channels 11, 11 'beyond the dome 12 via a connected arrangement at least one near the floor to both sides towards the transverse walls 7 and 7 ' Coolant guidance, with projections 24 provided on the transverse walls 7, 7 ' the further coolant guide for transverse flow through the coolant chamber section 8 serve and the free cross sections between the connected Gas exchange channels 11, 11 'and the transverse walls 7, 7' and the top wall 4 on the outlet side Form throttling points.
  • the invention is preferably used in a cylinder head 1 with an exhaust side of gas exchange outlet collecting channels 9 traversed longitudinal channel 13 with the essential Advantages of a uniform cylinder head temperature on the one hand and a high rigidity of the cylinder head 1 on the other hand.

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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)

Description

Die Erfindung bezieht sich nach dem Oberbegriff des Patentanspruches 1 auf einen flüssigkeitsgekühlten Zylinderkopf einer mehrzylindrigen, je Zylinder mehrventiligen Brennkraftmaschine, mit einem zwischen Außenwänden von einem Zylinderkopfboden und einer beabstandeten Deckwand begrenzten Kühlmittelraum, der zur Kühlmittelquerströmung mittels zwischen Schraubenpfeifen einer Zylinderkopf-Verschraubung vorgesehenen Querwänden in Abschnitte unterteilt ist, wobei zwischen benachbarten Querwänden jeweils zu einem Sammelkanal vereinigte, gleichartige Gaswechselkanäle zur jeweiligen Außenwand gerichtet verlaufend angeordnet sind, und inmitten der zylinderkopfseitig endenden Gaswechselkanäle ein die Deckwand durchsetzender Dom für eine Zündkerze und/oder eine Einspritzdüse vorgesehen ist.According to the preamble of claim 1, the invention relates to a liquid-cooled cylinder head of a multi-cylinder, multi-valve per cylinder Internal combustion engine, with one between the outer walls of a cylinder head floor and a spaced top wall limited coolant space that for Cross-flow of coolant by means of a cylinder head screw connection between screw pipes provided transverse walls is divided into sections, with between Adjacent transverse walls are combined to form a collecting channel Gas exchange ducts are arranged directed to the respective outer wall, and in the middle of the gas exchange channels ending on the cylinder head, the top wall penetrating dome provided for a spark plug and / or an injection nozzle is.

Ein derartiger Zylinderkopf ist beispielsweise aus der DE-C 38 38 953 bekannt. Nachteilig bei diesem bekannten Zylinderkopf ist der relativ große Kühlmittelraum, wobei die Geschwindigkeit der Querströmung in jedem Kühlmittelraum-Abschnitt über zu dem mittigen Dom gerichtet an den Querwänden angeordnete Vorsprünge bestimmt ist, die über ihre Höhe gegeneinander versetzt angeordnete Strömungskanten aufweisen. Diese Vorsprünge weisen deckwandseitig relativ nah dem Dom beabstandete Strömungskanten auf, dagegen zylinderkopfbodenseitig vom Dom weit entfernt angeordnete Strömungskanten zur Erzielung eines relativ großen Strömungsquerschnittes bei mäßiger Strömungsgeschwindigkeit.Such a cylinder head is known for example from DE-C 38 38 953. A disadvantage of this known cylinder head is the relatively large coolant space, being the velocity of the cross flow in each coolant compartment section via projections arranged on the transverse walls facing the central dome is determined, the flow edges arranged offset with respect to their height exhibit. These projections face the dome relatively close to the cathedral spaced flow edges on the other hand, on the cylinder head bottom side of the dome flow edges arranged far away to achieve a relatively large Flow cross section at moderate flow speed.

Demgegenüber zeigt und beschreibt die DE-C 196 08 576 einen ausschließlich quer durchströmten Zylinderkopf mit einem jedem Brennraumbereich zugeordneten Kühlmittelraum-Abschnitt, wobei der jeweilige Kühlmittelraum-Abschnitt zur Erzielung einer relativ hohen, turbulenten Strömungsgeschwindigkeit relativ niedrig ausgebildet ist.In contrast, DE-C 196 08 576 shows and describes an exclusively crosswise flowed through cylinder head with each combustion chamber area assigned Coolant chamber section, the respective coolant chamber section for achieving a relatively high, turbulent flow rate relatively low is.

Der Erfindung liegt die Aufgabe zugrunde, einen gattungsgemäßen Zylinderkopf mit Kühlmittelraum-Abschnitten zur Querströmung so auszugestalten, daß der Kühlmittelführung dienende Elemente für eine turbulente Strömung in Kühlmittelraum-Abschnitten von mittlerer Höhe zusätzlich einer erhöhten Steifigkeit des Zylinderkopfes dienen.The invention has for its object to provide a generic cylinder head To design coolant chamber sections for cross flow so that the coolant guide serving elements for a turbulent flow in coolant compartment sections of medium height additionally increased rigidity of the cylinder head serve.

Diese Aufgabe ist mit dem Patentanspruch 1 dadurch gelöst, daß der Zylinderkopf zumindest einen von einem einwärts zur Zylinderkopf-Längsmittenebene geneigten Abschnitt der Außenwand begrenzten Längskanal aufweist, der ferner von einem angrenzenden Zylinderkopf-Bodenabschnitt und einer diesen mit dem Außenwand-Abschnitt verbindenden Längswand gebildet ist, wobei die von einem Gaswechsel-Sammelkanal durchsetzte Längswand je eine ober und eine unter diesem Sammelkanal angeordnete Durchbrechung aufweist und die jeweilige zylinderkopfbodenseitig untere, in ihrem Querschnitt in Abhängigkeit der Entfernung von einem einzigen Kühlmittelzulauf des Längskanals gewählte Durchbrechung mit auf einen freien Ventilstegbereich zwischen gesonderten, gleichartigen Gaswechselkanälen gerichteten Leitrippen in Verbindung steht, die jeweils mit einem bodenseitigen Anschlußbereich des jeweiligen Gaswechselkanals eine Kühlmittelpassage bilden, und daß die obere Durchbrechung über dem Sammelkanal der Kühlmittelbeaufschlagung von zwischen jeweiligem Gaswechselkanal und der Deckwand ausgebildeten Ventilführungen dient. This object is achieved with claim 1 in that the cylinder head at least one from an inward to the cylinder head longitudinal center plane Section of the outer wall has limited longitudinal channel, which is further from a adjacent cylinder head bottom section and one with the outer wall section connecting longitudinal wall is formed, which of a gas exchange manifold interspersed longitudinal wall one upper and one below this collecting channel arranged opening and the respective cylinder head bottom lower, in cross-section depending on the distance from one single coolant inlet of the longitudinal channel selected opening with on free valve land area between separate, similar gas exchange channels Directional guide ribs is connected, each with a bottom connection area of the respective gas exchange channel form a coolant passage, and that the upper opening above the collecting channel of the coolant supply formed between the respective gas exchange channel and the top wall Valve guides serves.

Mit der Erfindung ist an einer Längsseite des Zylinderkopfes ein im Querschnitt dreieck- bis trapezförmiger Längskanal erzielt, der einerseits eine den einzelnen Kühlmittelraum-Abschnitten angepaßte Kühlmittelzufuhr in vorteilhafter Weise ermöglicht und der zum anderen wesentlich zu einer erhöhten Steifigkeit des Zylinderkopfes beiträgt. Zur weiteren Aussteifung des Zylinderkopfbodens zwischen der Längswand des Längskanals und den jeweiligen Brennraumgrenzen tragen ferner die von der Längswand jeweils ausgehenden Leitrippen bei, die gemäß einer weiteren Ausgestaltung mit dem Zylinderkopfboden und dem jeweiligen Sammelkanal sowie den anschließenden gesonderten Gaswechselkanälen jeweils in einstückiger Verbindung stehen.With the invention on a long side of the cylinder head a triangular in cross section to trapezoidal longitudinal channel, which on the one hand one of the individual coolant compartment sections adapted coolant supply allows in an advantageous manner and on the other hand significantly increases the rigidity of the cylinder head contributes. For further stiffening of the cylinder head base between the longitudinal wall of the longitudinal channel and the respective combustion chamber boundaries also carry those of the Longitudinal wall each outgoing guide ribs, which according to a further embodiment with the cylinder head base and the respective manifold as well as the subsequent separate gas exchange channels each in one piece stand.

Zur weiteren Aussteifung des Zylinderkopfes trägt weiter wesentlich bei, daß die Schraubenpfeifen zwischen der Deckwand und dem Zylinderkopfboden über etwa V-förmig angeordnete Wandungen mit der Längswand des Längskanals in einstückiger Verbindung stehen zur Bildung eines Ölrücklaufkanals mit einer in der Deckwand vorgesehenen Zulauföffnung, wobei die Längswand bodenseitig dem Ölrücklaufkanal benachbart angeordneten Überströmöffnungen für das Kühlmittel aus dem Längskanal aufweist. Mit diesen Überströmöffnungen ist weiter sichergestellt, daß Kühlmittelanteile der jeweils benachbarten, von einer Leitrippe und dem jeweiligen Gaswechselkanal begrenzten Kühlmittelpassage zugeführt sind mit dem Vorteil einer teilweisen Umströmung dieses Gaswechselkanals.To further stiffen the cylinder head further contributes significantly to that Screw whistles between the top wall and the cylinder head floor about V-shaped walls with the longitudinal wall of the longitudinal channel in one piece Connected to form an oil return channel with one in the Cover wall provided inlet opening, the longitudinal wall bottom of the oil return channel adjacent overflow openings for the coolant the longitudinal channel. With these overflow openings it is further ensured that coolant fractions of the neighboring, from a guide rib and the respective Gas exchange channel limited coolant passage are supplied with the advantage a partial flow around this gas exchange channel.

In weiterer Ausgestaltung wird vorgeschlagen, daß der Längskanal von einem jeweiligen Gaswechsel-Sammelkanal derart vom Zylinderkopf-Bodenabschnitt beabstandet durchsetzt ist, daß der Strömungsquerschnitt des Längskanals über dem Sammelkanal zur oberen Durchbrechung zur Kühlung der Ventilführungen relativ zu dem Strömungsquerschnitt unter dem Sammelkanal zur unteren Durchbrechung als Drosselquerschnitt dient. Der Vorteil dieser Ausgestaltung ist, daß für die den Leitrippen zugeordnete Durchbrechung eine dem Bedarf des jeweiligen Kühlmittelraum-Abschnittes entsprechende Kühlmittelmenge über die schlitz- bis rechteckig gestaltete Durchbrechung zuführbar ist. In a further embodiment it is proposed that the longitudinal channel of a respective Gas exchange manifold so spaced from the cylinder head bottom portion is that the flow cross-section of the longitudinal channel over the Collective channel to the upper opening for cooling the valve guides relative to the flow cross section under the collecting duct to the lower opening as Throttle cross section serves. The advantage of this configuration is that for the Guide ribs assigned an opening to the needs of the respective coolant compartment section corresponding amount of coolant over the slotted to rectangular designed opening can be fed.

Eine zur Beeinflussung der Strömungsgeschwindigkeit in Querrichtung des Zylinderkopfes vorteilhafte Ausgestaltung ist im weiteren dadurch erreicht, daß die den gesonderten Gaswechselkanälen jedes längskanalseitigen Gaswechsel-Sammelkanals gegenüberliegend angeordneten Gaswechselkanäle jenseits des Domes über eine verbundene Anordnung eine bodennah nach beiden Seiten zu den Querwänden gerichtete Kühlmittelführung bilden, und an den Querwänden vorgesehene Vorsprünge der weiteren Kühlmittelführung zur Querdurchströmung des Kühlmittelraum-Abschnittes dienen, wobei die freien Querschnitte zwischen den verbundenen Gaswechselkanälen und den Querwänden sowie der Deckwand als eine ablaufseitige Drosselstelle dienen.One for influencing the flow speed in the transverse direction of the cylinder head advantageous embodiment is further achieved in that the separate gas exchange ducts of each longitudinal exchange gas exchange duct opposite gas exchange channels beyond the cathedral via a connected arrangement close to the floor on both sides to the transverse walls form directed coolant guide, and provided on the transverse walls Projections of the further coolant guide for cross-flow through the coolant chamber section serve, the free cross-sections between the connected Gas exchange channels and the transverse walls as well as the top wall as an outlet side Serve throttle.

Diese Ausgestaltung ermöglicht in vorteilhafter Weise in Kombination mit einem weiteren Merkmal, wonach der Längskanal an einem Ende pumpenablaufseitig angeschlossen ist, einerseits eine Zuführung kalten Kühlmittels mit relativ hoher Geschwindigkeit und andererseits einen Ablauf der Querströmung bei höherer Temperatur mit turbulenter Strömung.This configuration advantageously enables in combination with a Another feature, according to which the longitudinal channel is connected at one end on the pump outlet side is, on the one hand, a supply of cold coolant at a relatively high speed and on the other hand an outflow of the cross flow at a higher temperature with turbulent flow.

Für eine rasche Vergleichmäßigung der Temperatur im Zylinderkopf ist der Längskanal vorteilhaft auslaßseitig von Gaswechselauslaß-Sammelkanälen durchsetzt im Zylinderkopf angeordnet.The longitudinal channel is for a quick equalization of the temperature in the cylinder head advantageously interspersed on the outlet side with gas exchange outlet collecting ducts Cylinder head arranged.

Die Erfindung ist anhand eines in der Zeichnung abschnittsweise dargestellten, aufgebrochen gezeigten Zylinderkopfes beschrieben.The invention has been broken down on the basis of a section shown in the drawing described cylinder head described.

Eine flüssigkeitsgekühlter Zylinderkopf 1 einer mehrzylindrigen, je Zylinder mehrventiligen, nicht gezeigten Brennkraftmaschine weist einen zwischen Außenwänden 2 von einem Zylinderkopfboden 3 und einer beabstandeten Deckwand 4 begrenzten Kühlmittelraum 5 auf, der zur Kühlmittelquerströmung mittels zwischen Schraubenpfeifen 6 einer Zylinderkopf-Verschraubung vorgesehenen Querwänden 7, 7' in Abschnitte 8 unterteilt ist, wobei zwischen benachbarten Querwänden 7, 7' jeweils zu einem Sammelkanal 9, 9' vereinigte gleichartige Gaswechselkanäle 10, 10' bzw. 11, 11' zur jeweiligen Außenwand 2 gerichtet verlaufend angeordnet sind und inmitten der zylinderkopfseitig endenden Gaswechselkanäle 10, 10' bzw. 11, 11' ein die Deckwand 4 durchsetzender Dom 12 für eine Zündkerze und/oder eine Einspritzdüse vorgesehen ist.A liquid-cooled cylinder head 1 of a multi-cylinder, multi-valve per cylinder, Internal combustion engine, not shown, has a between outer walls 2 bounded by a cylinder head base 3 and a spaced top wall 4 Coolant chamber 5, the cross-flow of coolant by means of screw pipes 6 of a cylinder head screw connection provided transverse walls 7, 7 'in sections 8 is subdivided, each between adjacent transverse walls 7, 7 ' a collecting channel 9, 9 'combined similar gas exchange channels 10, 10' and 11, 11 'are arranged to run in the direction of the respective outer wall 2 and in the middle the gas exchange channels 10, 10 'or 11, 11' ending on the cylinder head side Top wall 4 penetrating dome 12 for a spark plug and / or an injection nozzle is provided.

Um aufgabengemäß zu erreichen, daß der Kühlmittelführung dienende Elemente für eine turbulente Strömung in Kühlmittelraum-Abschnitten 8 von mittlerer Höhe zusätzlich einer erhöhten Steifigkeit des Zylinderkopfes 1 dienen, wird erfindungsgemäß vorgeschlagen, daß der Zylinderkopf 1 zumindest einen von einem einwärts zur Zylinderkopf-Längsmittenebene geneigten Abschnitt 2' der Außenwand 2 begrenzten Längskanal 13 aufweist, der ferner von einem angrenzenden Zylinderkopf-Bodenabschnitt 3' und einer diesen mit dem Außenwand-Abschnitt 2' verbindenden Längswand 14 gebildet ist, wobei die von einem Gaswechsel-Sammelkanal 9 durchsetzte Längswand 14 je eine ober und eine unter diesem Sammelkanal 9 angeordnete Durchbrechung 15 und 16 aufweist. Hierbei steht die zylinderkopfseitig untere, in ihrem Querschnitt in Abhängigkeit der Entfernung von einem einzigen, pumpenablaufseitig zugeordneten Kühlmittelzulauf des Längskanals 13 gewählte Durchbrechung 16 mit auf einen freien Ventilstegbereich 17 zwischen gesonderten, gleichartigen Gaswechselkanälen 10, 10' des Sammelkanals 9 gerichteten Leitrippen 18, 18' in Verbindung, die jeweils mit einem bodenseitigen Anschlußbereich des jeweiligen Gaswechselkanals 10, 10' eine Kühlmittelpassage 19, 19' bilden. Die obere Durchbrechung 15 in der Längswand 14 über dem Sammelkanal 9 dient der Kühlmittelbeaufschlagung von zwischen jeweiligem Gaswechselkanal 10, 10' und der Deckwand 4 ausgebildeten Ventilführungen 20, 20'.In order to achieve the task that the coolant guide elements for a turbulent flow in coolant space sections 8 of medium height in addition An increased rigidity of the cylinder head 1 is used according to the invention suggested that the cylinder head 1 at least one of an inward limited to the cylinder head longitudinal center plane section 2 'of the outer wall 2 Longitudinal channel 13, which further from an adjacent cylinder head bottom portion 3 'and one connecting this to the outer wall section 2' Longitudinal wall 14 is formed, wherein the gas exchange manifold 9th interspersed longitudinal wall 14 one upper and one arranged below this collecting channel 9 Opening 15 and 16 has. Here is the cylinder head side lower, in cross-section depending on the distance from a single, selected coolant inlet of the longitudinal channel 13 on the pump outlet side Opening 16 with a free valve web area 17 between separate, Similar gas exchange channels 10, 10 'of the collecting channel 9 directed guide ribs 18, 18 'in connection, each with a bottom-side connection area of the respective gas exchange channel 10, 10 'form a coolant passage 19, 19'. The upper opening 15 in the longitudinal wall 14 above the collecting channel 9 is used Applying coolant between the respective gas exchange duct 10, 10 'and the top wall 4 formed valve guides 20, 20 '.

Zusätzlich zu dem an einer Längsseite des Zylinderkopfes 1 verlaufend angeordneten, im Querschnitt dreieck- bis trapezförmig gestalteten Längskanal 13 dient zur weiteren Aussteifung des Zylinderkopfes 1 ferner, daß die Schraubenpfeifen 6 zwischen der Deckwand 4 und dem Zylinderkopfboden 3 über etwa V-förmig angeordnete Wandungen 21 mit der Längswand 14 des Längskanals 13 in einstückiger Verbindung stehen zur Bildung eines Ölrücklaufkanals 22 mit einer in der Deckwand 4 vorgesehenen Zulauföffnung 22', wobei die Längswand 14 bodenseitig dem Ölrücklaufkanal 22 benachbart angeordnete Überströmöffnungen 23 aufweist. Diese Überströmöffnungen 23 dienen einerseits einer partiellen Kühlmittelzuführung zu den Kühlmittelpassagen 19 bzw. 19' der Leitrippen 18 und 18' und andererseits einer Kühlung des Ölrücklaufkanals 22.In addition to the running on a long side of the cylinder head 1, Triangular to trapezoidal shaped longitudinal channel 13 is used for further stiffening of the cylinder head 1 further that the screw pipes 6 between the top wall 4 and the cylinder head base 3 arranged approximately V-shaped Walls 21 in one piece with the longitudinal wall 14 of the longitudinal channel 13 are to form an oil return channel 22 with one in the top wall 4 provided inlet opening 22 ', the longitudinal wall 14 on the bottom of the oil return channel 22 has adjacent overflow openings 23. These overflow openings 23 serve on the one hand a partial coolant supply to the Coolant passages 19 and 19 'of the guide ribs 18 and 18' and the other one Cooling the oil return channel 22.

Zur gezielten Kühlmittelaufteilung für jeden Kühlmittelraum-Abschnitt 8 ist weiter der Längskanal 13 von einem jeweiligen Gaswechsel-Sammelkanal 9 derart vom Zylinderkopf-Bodenabschnitt 3' beabstandet durchsetzt, daß der Strömungsquerschnitt des Längskanals 13 über dem Gaswechsel-Sammelkanal 9 zur oberen Durchbrechung 15 relativ zu dem Strömungsquerschnitt unter diesem Sammelkanal 9 zur unteren Durchbrechung 16 als Drosselquerschnitt dient. Mit dieser Ausgestaltung ist sichergestellt, daß relativ kühles Kühlmittel aus dem pumpenablaufseitig angeschlossenen Längskanal 13 gezielt und in entsprechender Menge einem heißen Ventilstegbereich 17 zwischen gesonderten, gleichartigen Gaswechselkanälen 10 und 10' mittels der Leitrippen 18 und 18' zugeführt ist. Die obere Durchbrechung 15 der Längswand 14 dient einer eingeschränkten Kühlmittelbeaufschlagung des Sammelkanals 9 bzw. der an diesen anschließenden Gaswechselkanälen 10, 10' und insbesondere deren Ventilführungen 20, 20'.For the targeted coolant distribution for each coolant space section 8 is the Longitudinal channel 13 of a respective gas exchange manifold 9 such from the cylinder head bottom section 3 'spaced through that the flow cross-section of the longitudinal channel 13 above the gas exchange manifold 9 to the upper opening 15 relative to the flow cross section under this collecting duct 9 lower opening 16 serves as a throttle cross section. With this configuration is ensures that relatively cool coolant is connected from the pump outlet side Longitudinal channel 13 targeted and hot in a corresponding amount Valve land area 17 between separate, similar gas exchange channels 10 and 10 'is supplied by means of the guide ribs 18 and 18'. The upper opening 15 the longitudinal wall 14 is used to restrict the coolant Collecting channel 9 or the gas exchange channels 10, 10 'connected to them and in particular their valve guides 20, 20 '.

Zur Steigerung einer turbulenten Strömung in jedem Kühlmittelraum-Abschnitt 8 bilden erfindungsgemäß die den gesonderten Gaswechselkanälen 10, 10' jedes längskanalseitigen Gaswechsel-Sammelkanals 9 gegenüberliegend angeordneten Gaswechselkanäle 11, 11' jenseits des Domes 12 über eine verbundene Anordnung zumindest eine bodennah nach beiden Seiten zu den Querwänden 7 und 7' gerichtete Kühlmittelführung, wobei an den Querwänden 7, 7' vorgesehene Vorsprünge 24 der weiteren Kühlmittelführung zur Querdurchströmung des Kühlmittelraum-Abschnittes 8 dienen und hierbei die freien Querschnitte zwischen den verbundenen Gaswechselkanälen 11, 11' und den Querwänden 7, 7' sowie der Deckwand 4 ablaufseitige Drosselstellen bilden.To increase turbulent flow in each coolant compartment section 8 form according to the invention the separate gas exchange channels 10, 10 'each arranged along the side channel gas exchange manifold 9 opposite Gas exchange channels 11, 11 'beyond the dome 12 via a connected arrangement at least one near the floor to both sides towards the transverse walls 7 and 7 ' Coolant guidance, with projections 24 provided on the transverse walls 7, 7 ' the further coolant guide for transverse flow through the coolant chamber section 8 serve and the free cross sections between the connected Gas exchange channels 11, 11 'and the transverse walls 7, 7' and the top wall 4 on the outlet side Form throttling points.

Zur Erzielung einer effizienten Kühlmittelzufuhr zum freien Ventilstegbereich 17 und weiter zur Erhöhung der Steifigkeit des Zylinderkopfes stehen die Leitrippen 18, 18' mit dem Zylinderkopfboden 3 und dem Gaswechsel-Sammelkanal 9 sowie den anschließenden, gesonderten Gaswechselkanälen 10, 10' jeweils in einstückiger Verbindung. Mit dieser Ausgestaltung ist in Kombination mit einem zwischen benachbarten Schraubenpfeifen 6 sich erstreckenden Abschnitt der Längswand 14 sowie den einstückig anschließenden Wandungen 21 der Ölrücklaufkanäle 22 in Verbindung mit einer Zylinderkopf-Verschraubung eine vergleichmäßigte Pressung zwischen dem Zylinderkopf 1 und einem nicht dargestellten Motorgehäuse um jeden Zylinder bzw. Brennraum erzielt.To achieve an efficient coolant supply to the free valve land area 17 and to increase the rigidity of the cylinder head are the guide ribs 18, 18 ' with the cylinder head base 3 and the gas exchange manifold 9 and the subsequent, separate gas exchange channels 10, 10 'each in one piece. This configuration is in combination with one between neighboring ones Screw pipes 6 extending portion of the longitudinal wall 14 as well the integrally connected walls 21 of the oil return channels 22 in connection with a cylinder head screw connection a uniform pressure between the cylinder head 1 and an engine housing, not shown, around each Cylinder or combustion chamber achieved.

Die Erfindung findet bevorzugt Anwendung bei einem Zylinderkopf 1 mit auslaßseitig von Gaswechselauslaß-Sammelkanälen 9 durchsetzten Längskanal 13 mit den wesentlichen Vorteilen einer vergleichmäßigten Zylinderkopf-Temperatur einerseits und einer hohen Steifigkeit des Zylinderkopfes 1 andererseits.The invention is preferably used in a cylinder head 1 with an exhaust side of gas exchange outlet collecting channels 9 traversed longitudinal channel 13 with the essential Advantages of a uniform cylinder head temperature on the one hand and a high rigidity of the cylinder head 1 on the other hand.

Claims (7)

  1. A liquid-cooled cylinder head of a multi-cylinder internal combustion engine having a number of valves for each cylinder,
    comprising a coolant chamber (5) bounded between outer walls (2) by a cylinder head end (3) and a spaced-apart car body panel (4),
    the coolant chamber being divided into portions (8) by transverse walls (7, 7') provided between screw holes (6) in a cylinder head to obtain a transverse flow of coolant, wherein
    identical gas change valves (10, 10'; 11, 11') joined in a collecting gas-change duct (9, 9') are disposed between neighbouring transverse walls (7, 7') and directed towards the respective outer wall (2), and
    a dome (12) extending through the body panel is provided for a spark plug and/or an injection nozzle is provided in the middle of the gas change ducts (10, 10'; 11, 11') ending on the cylinder-head side,
    characterised in that
    the cylinder head (1) has a longitudinal duct (13) bounded by a portion (2') of an outer wall (2) inclined inwards towards the longitudinal central plane of the cylinder head and
    is formed by an adjoining cylinder-head end portion (3') and a longitudinal wall (14) connecting the said portion to the outer-wall portion (2'), wherein
    the longitudinal wall (14) through which the collecting gas-change duct (9) extends has an upper aperture (15) and an aperture (16) disposed under the said collecting gas-change duct (9) and
    the lower aperture (16) on the cylinder-head end side and having a cross-section chosen in dependence on the distance from a single coolant inlet of the longitudinal duct (13) is connected to guide ribs (18, 18') directed towards a free valve web region (17) between separate uniform gas change ducts (10, 10'),
    the ribs forming a coolant passage (9, 9') with an end-side region for connecting the respective gas change duct (10, 10') and
    the upper aperture (15), via the collecting gas-change duct (9), supplies coolant to valve guides (20, 21) disposed between each gas change duct (10, 10') and the body panel (4).
  2. A cylinder head according to claim 1, characterised in that
    the screw holes (6) between the panel body (4) and the cylinder head end (3) are in one piece and connected via approximately V-shaped walls (21) to the longitudinal wall (14) of the longitudinal duct (13) and are integral therewith and form an oil return duct (22) with an inlet opening (22') provided in the body panel (4), wherein
    the longitudinal wall (14) has neighbouring overflow openings (23) disposed on the end side of the oil return duct (22).
  3. A cylinder head according to claim 1 or 2, characterised in that
    each gas change collecting duct (9) extends through the longitudinal duct (13) and is so spaced apart by the cylinder head end portion (3') that
    the flow cross-section of the longitudinal duct (13) via the gas change collecting duct (9) to the upper aperture (15) serves as a restrictor cross-section relative to the flow cross-section under the said gas-change collecting duct (9) to the lower aperture (16).
  4. A cylinder head according to any of claims 1 to 3, characterised in that
    the gas change ducts (11, 11') disposed opposite the separate gas change ducts (10, 10') of each gas change collecting duct (9) on the longitudinal duct side, on the side beyond the dome (12) and via a connected arrangement, form a coolant guide near the end, directed on both sides towards the transverse walls (7, 7') and
    projections (24) on the transverse walls (7, 7') supply additional coolant to obtain a transverse flow through the coolant chamber portion (8), wherein
    the free cross-sections between the gas change collecting duct (9') of the connected gas change ducts (11, 11') and the transverse walls (7, 7') and the body panel (4) form restrictors on the outflow side.
  5. A cylinder head according to one or more of claims 1 to 4, characterised in that the guide ribs (18, 18') are connected and in one piece with the cylinder head end (3) and the gas-change collecting duct (9) and the adjoining separate gas change ducts (10, 10').
  6. A cylinder head according to one or more of claims 1 to 5, characterised in that the longitudinal duct (13) on the outlet side is disposed in the cylinder head (1) and the gas-change outlet collecting ducts (9) extend through it.
  7. A cylinder head according to one or more of claims 1 to 6, characterised in that the longitudinal duct (13) at an end region is connected via its single coolant inlet on the pump outlet side.
EP98123345A 1998-01-21 1998-12-08 Liquid cooled cylinder head for a multi-cylinder , multi-valve internal combustion engine Expired - Lifetime EP0931925B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19802060 1998-01-21
DE19802060A DE19802060A1 (en) 1998-01-21 1998-01-21 Liquid-cooled cylinder head of a multi-cylinder, multi-valve internal combustion engine

Publications (3)

Publication Number Publication Date
EP0931925A2 EP0931925A2 (en) 1999-07-28
EP0931925A3 EP0931925A3 (en) 2000-03-15
EP0931925B1 true EP0931925B1 (en) 2003-11-05

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EP98123345A Expired - Lifetime EP0931925B1 (en) 1998-01-21 1998-12-08 Liquid cooled cylinder head for a multi-cylinder , multi-valve internal combustion engine

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DE (2) DE19802060A1 (en)
ES (1) ES2210649T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934667B4 (en) * 1999-07-23 2014-03-13 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Liquid-cooled internal combustion engine
DE10048582B4 (en) * 2000-09-30 2013-06-06 Volkswagen Ag Liquid cooled cylinder head for an internal combustion engine
DE10251360B4 (en) * 2002-11-05 2005-01-20 Daimlerchrysler Ag Liquid cooled cylinder head
DE10257064A1 (en) * 2002-12-06 2004-06-24 Bayerische Motoren Werke Ag Liquid-cooled, cast cylinder head of a multi-cylinder internal combustion engine
DE102004005749B4 (en) * 2004-02-05 2014-01-02 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Coolant-jacketed cylinder head with optimized coolant space
DE102006021175A1 (en) * 2006-05-06 2007-11-08 Bayerische Motoren Werke Ag Cylinder head e.g. for internal combustion engine, has moveable channel wall formed from moveable channel which leads to combustion chamber
DE102006036422A1 (en) * 2006-08-04 2008-02-21 Bayerische Motoren Werke Ag Liquid cooled cylinder head for an internal combustion engine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1838436A (en) * 1929-12-20 1931-12-29 Int Harvester Co Internal combustion engine
US2368080A (en) * 1942-07-22 1945-01-23 Continental Motors Corp Engine
JPH07103828B2 (en) 1987-11-17 1995-11-08 本田技研工業株式会社 Cylinder head for water-cooled multi-cylinder engine
DE3836941C1 (en) * 1988-10-29 1989-06-15 Bayerische Motoren Werke Ag, 8000 Muenchen, De
DE19608576C1 (en) 1996-03-06 1997-06-19 Daimler Benz Ag Liquid cooled motor cylinder head

Also Published As

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DE19802060A1 (en) 1999-07-22
EP0931925A3 (en) 2000-03-15
ES2210649T3 (en) 2004-07-01
EP0931925A2 (en) 1999-07-28
DE59810082D1 (en) 2003-12-11

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