EP0353577B1 - Cylinder head for an internal-combustion engine - Google Patents

Cylinder head for an internal-combustion engine Download PDF

Info

Publication number
EP0353577B1
EP0353577B1 EP19890113541 EP89113541A EP0353577B1 EP 0353577 B1 EP0353577 B1 EP 0353577B1 EP 19890113541 EP19890113541 EP 19890113541 EP 89113541 A EP89113541 A EP 89113541A EP 0353577 B1 EP0353577 B1 EP 0353577B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
guide surfaces
control
wall parts
disposed
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
Application number
EP19890113541
Other languages
German (de)
French (fr)
Other versions
EP0353577A2 (en
EP0353577A3 (en
Inventor
Jiri Seidl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0353577A2 publication Critical patent/EP0353577A2/en
Publication of EP0353577A3 publication Critical patent/EP0353577A3/en
Application granted granted Critical
Publication of EP0353577B1 publication Critical patent/EP0353577B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • 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
    • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2307/00—Preventing the rotation of tappets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/104—Lubrication of valve gear or auxiliaries of tappets
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • 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

Definitions

  • the invention relates to a cylinder head for reciprocating internal combustion engines according to the generic features of claim 1.
  • Such a cylinder head is known for example from US-A-2,863,432.
  • This cylinder head comprises a separate control housing, which essentially serves for the arrangement of control shafts. Tappets interacting with the control shafts for actuating the lift valves for gas exchange channels guided in the cylinder head are arranged in guides of a further part separate from the cylinder head and control housing. This part, which is isolated for each cylinder head of the internal combustion engine, delimits a control chamber, which is used primarily for the arrangement of valve springs, above the top wall of the cylinder head.
  • the cylinder head described above is equipped with - seen in plan view - rectangular tappets, which are only interact in opposite circumferential parts with guide surfaces of the tappet guide.
  • the invention has for its object to develop a generic cylinder head so that structurally integrated guides of the open type with paired opposing guide surfaces are achieved without special effort for the manufacture of the cylinder head in the mold casting.
  • guides of the open type can advantageously be arranged as an integral part of the cylinder head without any special effort.
  • the arrangement according to the invention in conjunction with the open design of the guides gives the advantage of being able to choose the best possible simple machining of the flat or curved guide surfaces.
  • the arrangement according to the invention of a tappet guide of the open type offers the further advantage of a control chamber which can be produced using the mold casting method in the case of a casting consisting of a cylinder head and control housing.
  • a further characteristic feature of claim 1 relates to two laterally spaced tappet guides, the wall parts of which are connected between the tappet guides via a connecting web with the side limitation of the control housing or the control chamber.
  • This configuration serves for the transverse stiffening of the control housing which is connected in one piece to the cylinder head and thus for the stiffening of the entire casting.
  • a cylinder head screw connection which is closely adjacent to the tappet guides and with a small cylinder spacing, the above-described configuration is advantageously effective.
  • the stiffening of the control housing or the entire cylinder head can be further increased according to a further characteristic feature of claim 1 in that a wall part is additionally supported against an approximately cylinder-axial shaft for a spark plug or an injection nozzle, wherein opposite wall parts can also be supported against each other.
  • a lubricating oil channel is provided in the side boundary according to claim 3, which is in oil-bearing connection with openings in the adjacent guide surfaces.
  • the invention according to claim 1 enables cylinder head and control housing to be produced in one piece in permanent mold casting, the areas for the guide surfaces being equipped with a slight excess for subsequent machining.
  • their guide surfaces can advantageously be machined using rotating tools. Adjacent guides for valves that are directed differently from one another can also be machined properly.
  • a cylinder head 1 for a reciprocating piston internal combustion engine comprises gas exchange channels 2 and 3, which are controlled by means of lift valves 4 and 5.
  • the lift valves 4 and 5 are guided in the cylinder head 1, the free shaft ends 6 of which are arranged in control chambers 7.
  • the control chambers 7 are a top wall 100 of the cylinder head 1 in a control housing 8 connected to it adjacent.
  • the spring-loaded lift valves 4 and 5 are each actuated by a control shaft 10 via a plunger 9.
  • Each plunger 9 slides in a guide 11 assigned to the control chamber 7.
  • Each guide 11 is designed in such a way that it only has guide surfaces 12, 13 which cooperate with opposite partial circumferences of the plunger 9.
  • the guide surfaces 12, 13 of the tappet guide 11 are arranged on the components delimiting the control chamber 7.
  • a component delimiting the control chamber 7 is a side delimitation 14 of the control housing 8, on which the guide surface 12 is formed.
  • Another component delimiting the control chamber 7 is a tongue-like wall part 15 which is arranged opposite the side delimitation 14 of the control housing 8 and is arranged freestanding on the top wall 100 and has the guide surface 13.
  • the control chamber 7 with guide surfaces 12 and 13 arranged in pairs on the components of a side boundary 14 of the control housing 8 delimiting the control chamber 7 and an opposite wall part 15 arranged essentially free-standing on the top wall 100 can be advantageous in one-piece design of the cylinder head 1 and control housing 8 in permanent mold casting be formed by a steel core.
  • the guide surfaces 12 and 13 of the laterally open tappet guide 11 are machined, preferably with a turning tool in the case of cylindrically curved guide surfaces 12 and 13, as can be seen in FIG. 2.
  • the tappets 9, which are only partially guided, in the laterally open guides 11 with relatively narrow guide surfaces 12 and 13 are accordingly in cross section designed rectangular to oval.
  • lift valves 4 and 5 With the valve tappet 9, which is narrow in relation to the cam rotating plane, lift valves 4 and 5, as can be seen in FIG. 2, can be arranged relatively closely spaced apart. A small mutual distance between the lift valves 4 and 5 enables a small cylinder diameter and a small cylinder distance.
  • a releasable connecting web 17 connecting the wall parts 15 to the side boundary 14 of the control housing 8 is arranged between the tappet guides 11.
  • the connecting web 17 can also serve to form the lower part of a control shaft bearing 18.
  • the wall parts 15 can be connected to a shaft wall 19 of an approximately cylinder-axial shaft 20 for a spark plug 21 via support webs 22.
  • opposite wall parts 15 can also be supported against one another, support wall 23.
  • the guide surfaces 12 on the side delimitations 14 have openings 24 which are connected to a lubricating oil channel 25 arranged in the side delimitation 14. This configuration serves to supply hydraulic valve lash compensation elements provided in the tappets 9 with lubricating oil.
  • a rotation lock stop 26 designed as an adapter sleeve is used to secure the rectangular to oval plungers 9 against rotation, the free end of the respective adapter sleeve projecting beyond the guide surface 13.
  • the invention enables Arrangement of the guides 11 and the guide surfaces 12 and 13 for the valve tappets 9 advantageously narrow valve angles with the favorable result of a flat combustion chamber for fast and clean combustion.

Landscapes

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

Description

Die Erfindung betrifft einen Zylinderkopf für Hubkolben-Brennkraftmaschinen nach den gattungsbildenden Merkmalen des Patentanspruches 1.The invention relates to a cylinder head for reciprocating internal combustion engines according to the generic features of claim 1.

Ein derartiger Zylinderkopf ist beispielsweise aus der US-A-2,863,432 bekannt. Dieser Zylinderkopf umfaßt ein gesondertes Steuergehäuse, das im wesentlichen der Anordnung von Steuerwellen dient. Mit den Steuerwellen zusammenwirkende Stößel zur Betätigung der im Zylinderkopf geführten Hubventile für Gaswechselkanäle sind in Führungen eines weiteren, von Zylinderkopf und Steuergehäuse gesonderten Teiles angeordnet. Dieses für jeden Zylinderkopf der Brennkraftmaschine vereinzelte Teil begrenzt über der Deckwand des Zylinderkopfes eine vorwiegend der Anordnung von Ventilfedern dienende Steuerkammer.Such a cylinder head is known for example from US-A-2,863,432. This cylinder head comprises a separate control housing, which essentially serves for the arrangement of control shafts. Tappets interacting with the control shafts for actuating the lift valves for gas exchange channels guided in the cylinder head are arranged in guides of a further part separate from the cylinder head and control housing. This part, which is isolated for each cylinder head of the internal combustion engine, delimits a control chamber, which is used primarily for the arrangement of valve springs, above the top wall of the cylinder head.

Die Ausbildung entsprechend der Zylinderzahl der Brennkraftmaschine vereinzelter Teile ermöglicht zwar ohne weiteres die spanabhebende Bearbeitung der Stößel-Führungen, sie führt jedoch zu einem beträchtlichen Bauaufwand.The training according to the number of cylinders of the internal combustion engine of individual parts allows the machining of the tappet guides without any problems, but it leads to a considerable construction effort.

Der vorbeschriebene Zylinderkopf ist mit - in Draufsicht gesehen - rechteckigen Stößeln ausgerüstet, die lediglich in einander gegenüberliegenden Umfangsteilen mit Führungsflächen der Stößel-Führung zusammenwirken.The cylinder head described above is equipped with - seen in plan view - rectangular tappets, which are only interact in opposite circumferential parts with guide surfaces of the tappet guide.

Eine andere Ausgestaltung eines Zylinderkopfes mit rechteckigen und/oder ovalen Ventil-Stößeln zeigt die US-A-4,637,357. Hierbei sind die Ventil-Stößel über den gesamten Umfang geführt. Diese umfänglich geschlossenen Führungen sind als Durchbrechungen in einer Leiste ausgebildet, die oberhalb einer im Steuergehäuse integrierten Steuerkammer mit einer Seitenbegrenzung des Steuergehäuses einstückig verbunden ist. Um eine einwandfreie spanabhebende Bearbeitung der geschlossenen Stößel-Führungen sicherzustellen, ist die Leiste in einem vom übrigen Steuergehäuse lösbaren Teil angeordnet.Another configuration of a cylinder head with rectangular and / or oval valve lifters is shown in US Pat. No. 4,637,357. The valve tappets are guided over the entire circumference. These circumferentially closed guides are designed as openings in a strip which is connected in one piece above a control chamber integrated in the control housing with a side boundary of the control housing. In order to ensure perfect machining of the closed tappet guides, the bar is arranged in a part that is detachable from the rest of the control housing.

Der Erfindung liegt die Aufgabe zugrunde, einen gattungsgemäßen Zylinderkopf so weiterzubilden, daß baulich integrierte Führungen der offenen Bauart mit paarweise einander gegenüberliegenden Führungsflächen ohne besonderen Aufwand erzielt sind zur Herstellung des Zylinderkopfes im Kokillen-Guß.The invention has for its object to develop a generic cylinder head so that structurally integrated guides of the open type with paired opposing guide surfaces are achieved without special effort for the manufacture of the cylinder head in the mold casting.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Mit der Erfindung können Führungen der offenen Bauart vorteilhaft ohne besonderen Aufwand als integraler Bestandteil des Zylinderkopfes angeordnet werden. Weiter ergibt die erfindungsgemäße Anordnung in Verbindung mit der offenen Bauart der Führungen den Vorteil, die jeweils bestmögliche einfache spanabhebende Bearbeitung der ebenen oder gekrümmten Führungsflächen wählen zu können. Schließlich bietet die erfindungsgemäße Anordnung einer Stößel-Führung der offenen Bauart den weiteren Vorteil einer im Kokillengußverfahren herstellbaren Steuerkammer bei einem aus Zylinderkopf und Steuergehäuse bestehenden Gußstück.This object is achieved with the characterizing features of patent claim 1. With the invention, guides of the open type can advantageously be arranged as an integral part of the cylinder head without any special effort. Furthermore, the arrangement according to the invention in conjunction with the open design of the guides gives the advantage of being able to choose the best possible simple machining of the flat or curved guide surfaces. Finally, the arrangement according to the invention of a tappet guide of the open type offers the further advantage of a control chamber which can be produced using the mold casting method in the case of a casting consisting of a cylinder head and control housing.

Ein weiteres Kennzeichenmerkmal des Anspruches 1 bezieht sich auf zwei lateral beabstandete Stößel-Führungen, deren Wandteile zwischen den Stößel-Führungen über einen Verbindungssteg mit der Seitenbegrenzung des Steuergehäuses bzw. der Steuerkammer in Verbindung stehen. Diese Ausgestaltung dient der Quer-Aussteifung des mit dem Zylinderkopf einteilig verbundenen Steuergehäuses und damit der Aussteifung des gesamten Gußstückes. Im Hinblick auf eine den Stößel-Führungen eng benachbarte Zylinderkopfverschraubung bei geringem Zylinderabstand ist die vorbeschriebene Ausgestaltung vorteilhaft wirksam. Die Aussteifung des Steuergehäuses bzw. des gesamten Zylinderkopfes kann nach einem weiteren Kennzeichenmerkmal des Anspruches 1 weiter dadurch gesteigert werden, daß ein Wandteil gegen einen etwa zylinderaxialen Schacht für eine Zündkerze oder eine Einspritzdüse zusätzlich abgestützt ist, wobei einander gegenüberliegende Wandteile auch gegeneinander abgestützt sein können. Mit der Kombination aller Kennzeichenmerkmale des Anspruches 1 ist ein Zylinderkopf mit integriertem Steuergehäuse erzielt, der vorteilhafterweise für einen Kokillenguß steuergehäuseseitig frei von Hinterschneidungen gestaltbar ist und ferner eine ausreichende Quer-Aussteifung ermöglicht.A further characteristic feature of claim 1 relates to two laterally spaced tappet guides, the wall parts of which are connected between the tappet guides via a connecting web with the side limitation of the control housing or the control chamber. This configuration serves for the transverse stiffening of the control housing which is connected in one piece to the cylinder head and thus for the stiffening of the entire casting. With regard to a cylinder head screw connection which is closely adjacent to the tappet guides and with a small cylinder spacing, the above-described configuration is advantageously effective. The stiffening of the control housing or the entire cylinder head can be further increased according to a further characteristic feature of claim 1 in that a wall part is additionally supported against an approximately cylinder-axial shaft for a spark plug or an injection nozzle, wherein opposite wall parts can also be supported against each other. With the combination of all the characteristic features of claim 1, a cylinder head with an integrated control housing is achieved, which can advantageously be designed free of undercuts on the control housing side for a mold casting and also enables sufficient transverse stiffening.

Zur Versorgung von hydraulischen Ventilspiel-Ausgleichselementen in den Ventil-Stößeln mit Schmieröl der Brennkraftmaschine ist nach Anspruch 3 in der Seitenbegrenzung ein Schmieröl-Kanal vorgesehen, der mit Öffnungen in den benachbarten Führungsflächen ölführend in Verbindung steht. Mit einer über die Führungsfläche vorstehend angeordneten Spannhülse ist ein relativ einfach zu erstellender Drehsicherungsanschlag erreicht.To supply hydraulic valve lash compensation elements in the valve tappets with lubricating oil of the internal combustion engine, a lubricating oil channel is provided in the side boundary according to claim 3, which is in oil-bearing connection with openings in the adjacent guide surfaces. With one over the A relatively easy to create anti-rotation stop is achieved in the guide surface of the clamping sleeve arranged above.

Wie weiter vorne bereits erwähnt, ermöglicht die Erfindung nach Anspruch 1 Zylinderkopf und Steuergehäuse einstückig in Kokillenguß zu fertigen, wobei die Bereiche für die Führungsflächen mit geringem Übermaß für eine nachfolgende spanabhebende Bearbeitung ausgestattet sind. Mit der Anordnung relativ schmaler, ovaler Stößel in den seitlich offenen Führungen können deren Führungsflächen mittels drehender Werkzeuge vorteilhaft bearbeitet werden. Benachbarte Führungen für zueinander unterschiedlich gerichtete Ventile sind ebenfalls einwandfrei zu bearbeiten.As already mentioned above, the invention according to claim 1 enables cylinder head and control housing to be produced in one piece in permanent mold casting, the areas for the guide surfaces being equipped with a slight excess for subsequent machining. With the arrangement of relatively narrow, oval plungers in the laterally open guides, their guide surfaces can advantageously be machined using rotating tools. Adjacent guides for valves that are directed differently from one another can also be machined properly.

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels beschrieben.
Es zeigen:

Fig. 1
einen Mehrventil-Zylinderkopf der Querstrombauart mit Steuergehäuse im Querschnitt im Bereich einer Stößel-Führung,
Fig. 2
Stößel-Führungen für zwei gleichartige Ventile des Zylinderkopfes in Draufsicht gemäß Ansicht "X".
The invention is described with reference to an embodiment shown in the drawing.
Show it:
Fig. 1
a multi-valve cylinder head of the cross-flow type with a control housing in cross section in the area of a tappet guide,
Fig. 2
Tappet guides for two identical valves of the cylinder head in plan view according to view "X".

Ein Zylinderkopf 1 für eine nicht weiter dargestellte Hubkolben-Brennkraftmaschine umfaßt Gaswechselkanäle 2 und 3, die mittels Hubventilen 4 und 5 gesteuert sind. Die Hubventile 4 und 5 sind im Zylinderkopf 1 geführt, wobei deren freie Schaftenden 6 in Steuerkammern 7 angeordnet sind. Die Steuerkammern 7 sind einer Deckwand 100 des Zylinderkopfes 1 in einem mit diesem verbundenen Steuergehäuse 8 benachbart angeordnet. Die federbelasteten Hubventile 4 und 5 sind jeweils über einen Stößel 9 von einer Steuerwelle 10 betätigt.A cylinder head 1 for a reciprocating piston internal combustion engine, not shown, comprises gas exchange channels 2 and 3, which are controlled by means of lift valves 4 and 5. The lift valves 4 and 5 are guided in the cylinder head 1, the free shaft ends 6 of which are arranged in control chambers 7. The control chambers 7 are a top wall 100 of the cylinder head 1 in a control housing 8 connected to it adjacent. The spring-loaded lift valves 4 and 5 are each actuated by a control shaft 10 via a plunger 9.

Jeder Stößel 9 gleitet in einer der Steuerkammer 7 zugeordneten Führung 11. Jede Führung 11 ist so gestaltet, daß sie lediglich mit einander gegenüberliegenden Teilumfängen des Stößels 9 zusammenwirkende Führungsflächen 12, 13 aufweist. Die Führungsflächen 12, 13 der Stößelführung 11 sind an die Steuerkammer 7 begrenzenden Bauteilen angeordnet. Ein die Steuerkammer 7 begrenzendes Bauteil ist eine Seitenbegrenzung 14 des Steuergehäuses 8, an dem die Führungsfläche 12 ausgebildet ist. Ein weiteres, die Steuerkammer 7 begrenzendes Bauteil ist ein der Seitenbegrenzung 14 des Steuergehäuses 8 gegenüber angeordnetes, zungenartig gestaltetes Wandteil 15, das an der Deckwand 100 freistehend angeordnet ist und die Führungsfläche 13 aufweist.Each plunger 9 slides in a guide 11 assigned to the control chamber 7. Each guide 11 is designed in such a way that it only has guide surfaces 12, 13 which cooperate with opposite partial circumferences of the plunger 9. The guide surfaces 12, 13 of the tappet guide 11 are arranged on the components delimiting the control chamber 7. A component delimiting the control chamber 7 is a side delimitation 14 of the control housing 8, on which the guide surface 12 is formed. Another component delimiting the control chamber 7 is a tongue-like wall part 15 which is arranged opposite the side delimitation 14 of the control housing 8 and is arranged freestanding on the top wall 100 and has the guide surface 13.

Die Steuerkammer 7 mit paarweise angeordneten Führungsflächen 12 und 13 an den die Steuerkammer 7 begrenzenden Bauteilen einer Seitenbegrenzung 14 des Steuergehäuses 8 und eines gegenüberliegenden, im wesentlichen freistehend an der Deckwand 100 angeordneten Wandteiles 15 kann bei einstückiger Ausführung von Zylinderkopf 1 und Steuergehäuse 8 im Kokillenguß vorteilhaft durch einen Stahlkern ausgeformt werden. Nach dem Gießen werden die Führungsflächen 12 und 13 der seitlich offenen Stößel-Führung 11 spanabhebend bearbeitet, vorzugsweise mit einem Drehwerkzeug bei zylindrisch gekrümmten Führungsflächen 12 und 13, wie aus Fig. 2 erkennbar.The control chamber 7 with guide surfaces 12 and 13 arranged in pairs on the components of a side boundary 14 of the control housing 8 delimiting the control chamber 7 and an opposite wall part 15 arranged essentially free-standing on the top wall 100 can be advantageous in one-piece design of the cylinder head 1 and control housing 8 in permanent mold casting be formed by a steel core. After casting, the guide surfaces 12 and 13 of the laterally open tappet guide 11 are machined, preferably with a turning tool in the case of cylindrically curved guide surfaces 12 and 13, as can be seen in FIG. 2.

Die lediglich in Teilumfängen geführten Stößel 9 in den seitlich offenen Führungen 11 mit relativ schmalen Führungsflächen 12 und 13 sind demgemäß im Querschnitt rechteckig bis oval gestaltet. Mit dem zur Nockendrehebene schmalbauenden Ventil-Stößel 9 können Hubventile 4 bzw. 5, wie aus Fig. 2 erkennbar, relativ eng beabstandet angeordnet werden. Ein geringer gegenseitiger Abstand der Hubventile 4 bzw. 5 ermöglicht einen kleinen Zylinderdurchmesser und einen geringen Zylinderabstand. Um den Einfluß der bei 16 nahe den Stößel-Führungen 11 angreifenden Zylinderkopf-Verschraubung geringzuhalten, ist zwischen den Stößelführungen 11 ein die Wandteile 15 mit der Seitenbegrenzung 14 des Steuergehäuses 8 verbindender, lösbarer Verbindungssteg 17 angeordnet. Der Verbindungssteg 17 kann ferner zur Ausbildung des unteren Teiles eines Steuerwellenlagers 18 dienen. Zur weiteren Aussteifung des Steuergehäuses 8 können die Wandteile 15 mit einer Schachtwand 19 eines etwa zylinderaxialen Schachtes 20 für eine Zündkerze 21 über Stützstege 22 in Verbindung stehen. Bei einem 4-Ventil-Querstrom-Zylinderkopf 1 können einander gegenüberliegende Wandteile 15 auch gegeneinander abgestützt sein, Stützwand 23.The tappets 9, which are only partially guided, in the laterally open guides 11 with relatively narrow guide surfaces 12 and 13 are accordingly in cross section designed rectangular to oval. With the valve tappet 9, which is narrow in relation to the cam rotating plane, lift valves 4 and 5, as can be seen in FIG. 2, can be arranged relatively closely spaced apart. A small mutual distance between the lift valves 4 and 5 enables a small cylinder diameter and a small cylinder distance. In order to keep the influence of the cylinder head screw connection attacking at 16 near the tappet guides 11 low, a releasable connecting web 17 connecting the wall parts 15 to the side boundary 14 of the control housing 8 is arranged between the tappet guides 11. The connecting web 17 can also serve to form the lower part of a control shaft bearing 18. To further stiffen the control housing 8, the wall parts 15 can be connected to a shaft wall 19 of an approximately cylinder-axial shaft 20 for a spark plug 21 via support webs 22. In a 4-valve cross-flow cylinder head 1, opposite wall parts 15 can also be supported against one another, support wall 23.

Die Führungsflächen 12 an den Seitenbegrenzungen 14 weisen Öffnungen 24 auf, die mit einem in der Seitenbegrenzung 14 angeordneten Schmierölkanal 25 in Verbindung stehen. Diese Ausgestaltung dient der Versorgung von in den Stößeln 9 vorgesehenen hydraulischen Ventilspiel-Ausgleichselementen mit Schmieröl.The guide surfaces 12 on the side delimitations 14 have openings 24 which are connected to a lubricating oil channel 25 arranged in the side delimitation 14. This configuration serves to supply hydraulic valve lash compensation elements provided in the tappets 9 with lubricating oil.

Zur Drehsicherung der rechteckig bis ovalen Stößel 9 dient jeweils ein als Spannhülse ausgebildeter Drehsicherungsanschlag 26, wobei die jeweilige Spannhülse mit ihrem freien Ende über die Führungsfläche 13 vorsteht.A rotation lock stop 26 designed as an adapter sleeve is used to secure the rectangular to oval plungers 9 against rotation, the free end of the respective adapter sleeve projecting beyond the guide surface 13.

Unabhängig von der Anzahl der jeweiligen Hubventile zur Steuerung der Gaswechselkanäle ermöglicht die erfindungsgemäße Anordnung der Führungen 11 bzw. der Führungsflächen 12 und 13 für die Ventil-Stößel 9 vorteilhaft enge Ventilwinkel mit der günstigen Folge eines flachen Brennraumes für schnelle und saubere Verbrennung.Regardless of the number of the respective lift valves for controlling the gas exchange channels, the invention enables Arrangement of the guides 11 and the guide surfaces 12 and 13 for the valve tappets 9 advantageously narrow valve angles with the favorable result of a flat combustion chamber for fast and clean combustion.

Claims (4)

  1. A cylinder head for reciprocating piston internal combustion engines wherein
    - a number of uniform spring-loaded gate valves (4, 5) for each gas change duct (2, 3) are actuated, with interposition of push rods (9), by control shafts (10) disposed in a control casing (8), and
    - control chambers (7) formed with guides (11) for the push rods (9) are disposed in the control casing (8) adjacent a cover wall (100) cast integrally with the cylinder head (1), and
    - the push-rod guides (11) have first and second guide surfaces (12, 13) formed on two spaced-apart portions and only partly surrounding the push rods (9), and
    - the first guide surfaces (13) are disposed on projecting wall parts (15) in the control casing (8) between each side boundary (14) of the control casing (8) and an approximately cylinder-axial shaft (20) for spark plugs or injection nozzles, characterised in that
    - on the one hand the side boundaries (14) of the control casing (8) and on the other hand the wall parts (15) and the shaft (20) are cast in one piece with the cover wall (100) which is integral with the cylinder head (1), and
    - the second guide surfaces (12) on the side boundaries (14) are disposed opposite the first guide surfaces (13) formed on the wall parts (15), and
    - the side boundaries (14) are connected to adjacent wall parts (15) via releasable webs (17) between adjacent second guide surfaces (12) of the push-rod guides (11) which are laterally open in the longitudinal direction of the cylinder head, and
    - the wall parts (15) are connected by bracing webs (22) to the shaft (20) or by bracing walls (23) to one another.
  2. A cylinder head according to claim 1, characterised in that it is made by chill casting.
  3. A cylinder head according to claims 1 and 2, characterised in that the guide surfaces (12) at the side boundaries (14) have openings (24) for connecting to lubricating oil ducts (25) disposed in the side boundaries (14), and
    - clamping sleeves project from the first guide surfaces (13) in the wall parts (15) and serve as abutments (26) preventing rotation.
  4. A cylinder head according to claims 1 to 3, characterised in that the connecting webs (17) serve as the bottom parts of divided control-shaft bearings (18).
EP19890113541 1988-07-30 1989-07-22 Cylinder head for an internal-combustion engine Expired - Lifetime EP0353577B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3826013A DE3826013A1 (en) 1988-07-30 1988-07-30 CYLINDER HEAD FOR PISTON PISTON COMBUSTION ENGINES
DE3826013 1988-07-30

Publications (3)

Publication Number Publication Date
EP0353577A2 EP0353577A2 (en) 1990-02-07
EP0353577A3 EP0353577A3 (en) 1990-04-04
EP0353577B1 true EP0353577B1 (en) 1993-03-31

Family

ID=6359958

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890113541 Expired - Lifetime EP0353577B1 (en) 1988-07-30 1989-07-22 Cylinder head for an internal-combustion engine

Country Status (2)

Country Link
EP (1) EP0353577B1 (en)
DE (2) DE3826013A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4002964A1 (en) * 1990-02-01 1991-08-08 Audi Ag IC engine cylinder head - has tappet openings of cross=sections comprising curved ends and outwards-arching sides
DE4117162A1 (en) * 1991-05-25 1992-11-26 Kloeckner Humboldt Deutz Ag 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
AT393297B (en) * 1979-03-23 1991-09-25 Denzel Kraftfahrzeug Wolfgang CYLINDER HEAD FOR INTERNAL COMBUSTION ENGINES
DE3209901C1 (en) * 1982-03-18 1983-10-27 Audi Nsu Auto Union Ag, 7107 Neckarsulm Single-part cylinder head for a reciprocating piston internal combustion engine
US4637357A (en) * 1985-04-29 1987-01-20 Yamaha Hatsudoki Kabushiki Kaisha Tappet arrangement for engine valve train
DE3604667A1 (en) * 1986-02-14 1987-08-20 Audi Ag Cast cylinder head for a multi-cylinder in-line internal combustion engine
DE3641129C1 (en) * 1986-12-02 1987-07-30 Daimler Benz Ag Device for mounting two camshafts in the cylinder head of a multi-cylinder in-line internal combustion engine

Also Published As

Publication number Publication date
EP0353577A2 (en) 1990-02-07
DE3826013A1 (en) 1990-02-01
EP0353577A3 (en) 1990-04-04
DE58903935D1 (en) 1993-05-06

Similar Documents

Publication Publication Date Title
DE2809157C2 (en)
DE3613912C2 (en)
DE3240237C2 (en)
DE4326159C2 (en) Multi-cylinder internal combustion engine with rows of cylinders arranged in a V-shape
DE3610447C2 (en)
EP0688946B1 (en) Cylinder head layout of an internal combustion engine
DE19619183C1 (en) Cylinder head arrangement for internal combustion engine
EP0099873A2 (en) Cylindrical rotary valve with seal for piston engines
DE3601274C2 (en)
EP0353577B1 (en) Cylinder head for an internal-combustion engine
DE19618401C1 (en) Cylinder head arrangement for internal combustion engine
DE3735998C2 (en)
WO1996002739A1 (en) Device for the simultaneous actuation of at least two gas shuttle valves
EP0515925B1 (en) Cylinder head for combustion engine
DE4417309A1 (en) Reciprocating-piston internal combustion engine with compression control
EP0180847B1 (en) Valve drive housing for a cylinder head of an internal-combustion engine with substantially parallel-arranged valves
EP0845582B1 (en) Valve control for an internal combustion engine provided with lift valves for the gas exchange
DE3604667A1 (en) Cast cylinder head for a multi-cylinder in-line internal combustion engine
DE2943560C2 (en) Device for an internal combustion engine
DE10009776C1 (en) Cylinder head for an IC motor has a slit at the surface towards the crankcase opposite the cylinder dividing web to form part of the coolant circuit
DE102004034912B4 (en) Cylinder head structure of an engine
DE3932293C1 (en)
DE3725458A1 (en) Control device for inlet/exhaust valves of an internal combustion engine
DE2800680A1 (en) IC engine rotary valve system - has separate drums on shaft with ports for each cylinder with system of sealing rings
DE4140244B4 (en) IC engine charge change valve free play compensator - has several peripheral ducts from compensator to tappet periphery

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT SE

17P Request for examination filed

Effective date: 19900507

17Q First examination report despatched

Effective date: 19910524

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT SE

ET Fr: translation filed
REF Corresponds to:

Ref document number: 58903935

Country of ref document: DE

Date of ref document: 19930506

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19930413

RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930630

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930720

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930729

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940722

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940723

EUG Se: european patent has lapsed

Ref document number: 89113541.0

Effective date: 19950210

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940722

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950331

EUG Se: european patent has lapsed

Ref document number: 89113541.0

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20010823

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050722