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EP0071778B1 - Air cooled multi-cylinder internal-combustion engine with overhead camshaft - Google Patents

Air cooled multi-cylinder internal-combustion engine with overhead camshaft Download PDF

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Publication number
EP0071778B1
EP0071778B1 EP82106215A EP82106215A EP0071778B1 EP 0071778 B1 EP0071778 B1 EP 0071778B1 EP 82106215 A EP82106215 A EP 82106215A EP 82106215 A EP82106215 A EP 82106215A EP 0071778 B1 EP0071778 B1 EP 0071778B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
combustion engine
air
casing
internal combustion
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
Application number
EP82106215A
Other languages
German (de)
French (fr)
Other versions
EP0071778A2 (en
EP0071778A3 (en
Inventor
Kurt Dr.-Ing. Honrath
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.)
Kloeckner Humboldt Deutz AG
Original Assignee
Kloeckner Humboldt Deutz 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 Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Priority to AT82106215T priority Critical patent/ATE13578T1/en
Publication of EP0071778A2 publication Critical patent/EP0071778A2/en
Publication of EP0071778A3 publication Critical patent/EP0071778A3/en
Application granted granted Critical
Publication of EP0071778B1 publication Critical patent/EP0071778B1/en
Expired legal-status Critical Current

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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
    • 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
    • F02F1/28—Cylinder heads having cooling means for air cooling
    • 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
    • F01L2001/0476—Camshaft bearings
    • 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
    • F02B2275/20—SOHC [Single overhead camshaft]

Definitions

  • the invention relates to an air-cooled internal combustion engine of the type mentioned in the preamble of the first claim.
  • This arrangement has the advantage that the camshaft or camshaft housing is aligned indirectly via the intake pipe.
  • the intake manifold itself must be mounted in such a way that no connection is required or must be aligned anyway, since a nozzle is required for each cylinder head.
  • the camshaft can be arranged laterally or above or below the intake pipe.
  • Another advantage of the invention is the fact that the dimensions of the internal combustion engine are practically not affected by the attachment of the camshaft to the intake pipe.
  • the camshaft and the valve actuation devices can be accommodated in a housing common to all the cylinder heads lying in a row.
  • this is time-consuming when a cylinder is repaired.
  • claim 4 proposes to separate the housings for the camshaft and for the valve actuators for each cylinder.
  • this has the advantage that a cylinder or cylinder head can now be removed without having to remove the camshaft housing or the housing of the adjacent valve actuation devices.
  • only a single type of housing for the valve actuation device needs to be kept available regardless of the number of cylinders.
  • the camshaft housing is - as another development (claim 6) suggests - advantageously connected to the intake manifold via the fastening screws for the camshaft bearings or the bearing cover - if a bearing shell is cast in one piece with the housing.
  • the camshaft can also be mounted directly on the intake pipe, the intake pipe also taking over the housing function.
  • Claim 8 proposes a particularly simple sealing of the valve guide on the housing base for the valve actuation devices.
  • the advantage of this arrangement is that the housing can be removed without having to dismantle the valve springs.
  • Fig. 1 the single cylinder head of an air-cooled internal combustion engine, not shown, is shown at 1. It includes a. a valve 2, a valve chamber 3 and an air intake duct 4.
  • an intake pipe 5 connects laterally to the cylinder head 1, from which a connecting duct 6 branches off into the air inlet duct 4.
  • the housing 7 has a U-shaped cross section where the outer leg 7.1 is significantly higher than the inner 7.2.
  • the housing 7 is closed on its two non-visible end faces, the camshaft being driven in a manner known per se by a chain inside or a toothed belt outside the housing 7 by the crankshaft or another suitable shaft of the internal combustion engine.
  • the camshaft 8 itself is mounted in split bearing switches 9 and 10.
  • the fastening screws 11 for the bearing shells are fastened in the intake pipe 5, so that the housing 7 is simultaneously held on the intake pipe 5 by them.
  • Another housing 12 is arranged laterally on the housing 7 and on the cylinder head 1. It is attached to the cylinder head 1 via screws 13, 14 and to the housing 7 via a screw-nut connection 15.
  • the valve actuation device 16 each consisting of two rocker arms 17, the rocker arm block 18 which is fastened to the housing base, the rocker arm shaft 19 and the valve adjusting screws 20 are accommodated.
  • the housing 12 is arranged at the same height as the housing 7 by means of suitable spacer disks 21 if all the housings can be closed by a common cover 22. This height compensation can be omitted when using separate lids.
  • Each valve is actuated by the camshaft 8 against the force of the valve spring 23 via the rocker arms 17. This is clamped between the upper valve plate 24 and the lower valve plate 25, which forms a unit with the valve guide 26.
  • the valve guide 26 penetrates the bottom of the housing 12.
  • a collar 27 surrounding the valve spring 23 is arranged on the valve plate 25. The collar 27 has such a height that it projects securely into the space enclosed by the housing 12.
  • a sealing ring 28 is provided, the strength of which corresponds to that of the spacer 21 used in each case. The interior of the housing is thus sealed oil-tight.
  • the cover 22 is first removed, then the housing 12 is released. It can then be lifted off the cylinder head together with the rocker arms 17 and their attachment. Then the cylinder head 1 is detached from the intake pipe 5 and after loosening the cylinder head screws, it can be lifted off the cylinder pipe with the valves.
  • the housing 7 is shown in one piece with the intake pipe 5 and the housing 12 is shown in one piece with the cylinder head 1.
  • an elongated hole is provided for the screw-nut connection 15 in order to compensate for the different overall heights.
  • a seal 30 is provided between each housing, and separate covers 31 and 32.
  • a commercially available valve guide 33 can now be used, since sealing is no longer necessary here.
  • bearing blocks 34 are made in one piece with the intake pipe 5. This requires a much larger position diameter of the camshaft 8, since it is now pushed axially through the bearing blocks.
  • the bearing blocks can also be divided, in which case the lower part with the suction pipe is made in one piece and the cover is screwed on.
  • FIGS. 1 and 2 It is of course also possible to carry out a combination of the variants of the invention shown in FIGS. 1 and 2, for example to design the housing 12 separately from the cylinder head 1 and the housing 7 in one piece with the intake pipe 5.

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

Abstract

An air-cooled internal combustion engine with individual cylinder heads. In order, with such an engine, to be able to use a single overhead camshaft for all cylinders located in-line, it is proposed according to the present invention to fasten the camshaft on the intake pipe, and to extend the rocker arms laterally beyond the cylinder head in such a manner so that the rocker arms can cooperate with the cams of the camshaft.

Description

Die Erfindung bezieht sich auf eine luftgekühlte Brennkraftmaschine der im Oberbegriff des ersten Anspruchs genannten Art.The invention relates to an air-cooled internal combustion engine of the type mentioned in the preamble of the first claim.

Aus der DE-A-2 502 058 ist eine luftgekühlte Mehrzylinder-Brennkraftmaschine mit obenliegender Nockenwelle bekannt, bei welcher das Nockenwellengehäuse oberhalb der Zylinderköpfe angeordnet und an zwei beliebigen, höchstgelegenen Zylinderköpfen befestigt ist und zwischen den übrigen Zylinderköpfen und dem Nockenwellengehäuse ein freier Abstand verbleibt. Dies ist deshalb notwendig, weil bei luftgekühlten Mehrzylinderbrennkraftmaschinen mit Einzelzylinderköpfen und Einzelzylindern die Bauhöhen der einzelnen Zylinderkopf-Zylindereinheiten untereinander unterschiedlich sind. Diese Unterschiede liegen zwar im Bereich von wenigen Millimetern, jedoch sind diese Unterschiede zu groß, um danach die Lagerung einer Nockenwelle auszurichten. Die Ausgestaltung nach der DE-A macht daher eine aufwendige Montage erforderlich, da durch Montage des Nockenwellengehäuses erst der freie Abstand zwischen den Zylinderköpfen und dem Gehäuse ermittelt werden muß, bevor nach Auswahl der geeigneten Beilagen das Nockenwellengehäuse endgültig montiert werden kann. Diese Vorgehensweise stellt einen allzu großen Bauaufwand dar.From DE-A-2 502 058 an air-cooled multi-cylinder internal combustion engine with an overhead camshaft is known, in which the camshaft housing is arranged above the cylinder heads and is attached to any two highest-lying cylinder heads and a free space remains between the other cylinder heads and the camshaft housing. This is necessary because in air-cooled multi-cylinder internal combustion engines with single cylinder heads and single cylinders, the overall heights of the individual cylinder head-cylinder units differ from one another. Although these differences are in the range of a few millimeters, these differences are too large to be able to align the bearing of a camshaft afterwards. The design according to DE-A therefore requires a complex assembly, since by mounting the camshaft housing, the free distance between the cylinder heads and the housing must first be determined before the camshaft housing can be finally installed after selection of the suitable inserts. This procedure is too expensive.

Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des ersten Anspruchs gelöst. Diese Anordnung hat den Vorteil, daß die Nockenwelle bzw. Nockenwellengehäuse mittelbar über das Ansaugrohr ausgerichtet ist. Das Ansaugrohr selbst muß, da zu jedem Zylinderkopf ein Stutzen erforderlich ist, so angebracht sein, daß keine Ausrichtung erforderlich ist oder aber ohnehin ausgerichtet werden. Die Nockenwelle kann je nach Ausgestaltung des Ansaugrohres seitlich oder oberhalb bzw. unterhalb des Saugrohres angeordnet sein. Ein weiterer Vorteil der Erfindung ist darin zu sehen, daß durch das Anbringen der Nockenwelle an dem Ansaugrohr die Baumaße der Brennkraftmaschine praktisch nicht beeinflußt werden.The object is achieved by the characterizing features of the first claim. This arrangement has the advantage that the camshaft or camshaft housing is aligned indirectly via the intake pipe. The intake manifold itself must be mounted in such a way that no connection is required or must be aligned anyway, since a nozzle is required for each cylinder head. Depending on the design of the intake pipe, the camshaft can be arranged laterally or above or below the intake pipe. Another advantage of the invention is the fact that the dimensions of the internal combustion engine are practically not affected by the attachment of the camshaft to the intake pipe.

Gemäß einer Weiterbildung der Erfindung kann - wie Anspruch 3 vorschlägt - die Nokkenwelle und die Ventilbetätigungseinrichtungen, wie Kipphebel samt Lagerung, in einem für alle in einer Reihe liegende Zylinderköpfe gemeinsamen Gehäuse untergebracht werden. Dies ist jedoch im Reparaturfalle eines Zylinders zeitraubend.According to a further development of the invention, the camshaft and the valve actuation devices, such as rocker arms including the bearing, can be accommodated in a housing common to all the cylinder heads lying in a row. However, this is time-consuming when a cylinder is repaired.

Deshalb schlägt Anspruch 4 vor, die Gehäuse für die Nockenwelle und für die Ventilbetätigungseinrichtungen für jeden Zylinder zu trennen. Dies hat zum einen den Vorteil, das nunmehr ein Zylinder oder Zylinderkopf entfernt werden kann, ohne daß das Nockenwellengehäuse oder die Gehäuse der benachbarten Ventilbetätigungseinrichtungen mit entfernt werden müssen. Zum anderen braucht nur ein einziger Gehäusetyp für die Ventilbetätigungseinrichtung unabhängig von der Zylinderanzahl bereitgehalten zu werden.Therefore, claim 4 proposes to separate the housings for the camshaft and for the valve actuators for each cylinder. On the one hand, this has the advantage that a cylinder or cylinder head can now be removed without having to remove the camshaft housing or the housing of the adjacent valve actuation devices. On the other hand, only a single type of housing for the valve actuation device needs to be kept available regardless of the number of cylinders.

In allen Fällen kann im Rahmen der Erfindung für alle Gehäuse ein gemeinsamer Deckel (Anspruch 5) oder für das Nockenwellengehäuse und die übrigen Gehäuse separate Deckel vorgesehen werden. Im letzteren Fall ist dann allerdings je eine Dichtung zwischen den Gehäusen erforderlich.In all cases, a common cover (claim 5) or separate covers for the camshaft housing and the other housings can be provided within the scope of the invention. In the latter case, however, a seal is required between the housings.

Das Nockenwellengehäuse wird - wie eine andere Weiterbildung (Anspruch 6) vorschlägt - vorteilhafterweise über die Befestigungsschrauben für die Nockenwellenlager oder die Lagerdeckel - falls eine Lagerschale mit dem Gehäuse einstückig gegossen ist - mit dem Ansaugrohr verbunden. Die Nockenwelle kann aber auch direkt am Ansaugrohr gelagert sein, wobei das Ansaugrohr die Gehäusefunktion mit übernimmt.The camshaft housing is - as another development (claim 6) suggests - advantageously connected to the intake manifold via the fastening screws for the camshaft bearings or the bearing cover - if a bearing shell is cast in one piece with the housing. However, the camshaft can also be mounted directly on the intake pipe, the intake pipe also taking over the housing function.

Um insbesondere bei Verwendung eines gemeinsamen Deckels und getrennten Gehäusen alle Gehäuse auf gleiche Höhe zu befestigen, werden gemäß Anspruch 7 Abstandsscheiben unterschiedlicher Stärke zwischen dem Zylinderkopf und den Gehäusen für die Ventilbetätigungseinrichtung untergelegt.In order to secure all housings at the same height, in particular when using a common cover and separate housings, spacers of different thicknesses are placed between the cylinder head and the housings for the valve actuation device.

Eine besonders einfache Abdichtung der Ventilführung am Gehäuseboden für die Ventilbetätigungseinrichtungen schlägt Anspruch 8 vor. Der Vorteil dieser Anordnung besteht darin, daß das Gehäuse entfernt werden kann, ohne die Ventilfedern abbauen zu müssen.Claim 8 proposes a particularly simple sealing of the valve guide on the housing base for the valve actuation devices. The advantage of this arrangement is that the housing can be removed without having to dismantle the valve springs.

Es ist auch im Rahmen der Erfindung denkbar, für die Nockenwelle und die Ventilbetätigungseinrichtungen keine separaten Gehäuse vorzusehen, sondern diese jeweils einstückig mit dem Ansaugrohr bzw. dem Zylinderkopf zu gießen. In diesem Fall müssen die beiden Gehäuse gegeneinander abgedichtet werden. Entfallen tut hierfür die aufwendigere Ventilführung, da eine Abdichtung an dieser Stelle nicht mehr notwendig ist.It is also conceivable within the scope of the invention not to provide separate housings for the camshaft and the valve actuation devices, but rather to cast them in one piece with the intake pipe or the cylinder head. In this case, the two housings must be sealed against each other. The more complex valve guide is no longer necessary, since sealing at this point is no longer necessary.

Im folgenden wird die Erfindung an zwei ausgewählten Beispielen dargestellt. Es zeigen

  • Fig. 1 und 2 schematische Querschnitte durch einen luftgekühlten Einzelzylinderkopf mit Ansaugrohr und darauf befestigter oberliegender Nockenwelle.
The invention is illustrated below using two selected examples. Show it
  • 1 and 2 are schematic cross sections through an air-cooled single cylinder head with an intake manifold and an overhead camshaft mounted thereon.

In beiden Figuren sind nur die zum Verständnis der Erfindung notwendigen Elemente schematisch dargestellt.In both figures, only the elements necessary for understanding the invention are shown schematically.

In Fig. 1 ist mit 1 der Einzelzylinderkopf einer weiter nicht dargestellten, luftgekühlten Brennkraftmaschine gezeigt. Er beinhaltet u. a. ein Ventil 2, eine Ventilkammer 3 und einen Lufteinlaßkanal4.In Fig. 1, the single cylinder head of an air-cooled internal combustion engine, not shown, is shown at 1. It includes a. a valve 2, a valve chamber 3 and an air intake duct 4.

An dem Kanal 4 schließt sich seitlich an den Zylinderkopf 1 ein Ansaugrohr 5 an, von welchem ein Verbindungskanal 6 in den Lufteinlaßkanal 4 abzweigt.On the duct 4, an intake pipe 5 connects laterally to the cylinder head 1, from which a connecting duct 6 branches off into the air inlet duct 4.

Auf dem Ansaugrohr 5 sitzt ein Gehäuse 7, welches die Nockenwelle 8 beinhaltet. Das Gehäuse 7 hat einen U-förmigen Querschnitt, wobei der äußere Schenkel 7.1 wesentlich höher als der innere 7.2 ist. Das Gehäuse 7 ist an seinen beiden nicht sichtbaren Stirnseiten geschlossen, wobei die Nockenwelle in an sich bekannter Weise durch eine Kette innerhalb oder einen Zahnriemen außerhalb des Gehäuses 7 von der Kurbelwelle oder einer anderen, geeigneten Welle der Brennkraftmaschine angetrieben wird.A housing 7, which contains the camshaft 8, sits on the intake pipe 5. The housing 7 has a U-shaped cross section where the outer leg 7.1 is significantly higher than the inner 7.2. The housing 7 is closed on its two non-visible end faces, the camshaft being driven in a manner known per se by a chain inside or a toothed belt outside the housing 7 by the crankshaft or another suitable shaft of the internal combustion engine.

Die Nockenwelle 8 selbst ist in geteilten Lagerschaltern 9 und 10 gelagert. Die Befestigungsschrauben 11 für die Lagerschalen sind im Ansaugrohr 5 befestigt, so daß durch sie gleichzeitig das Gehäuse 7 auf dem Ansaugrohr 5 gehalten wird.The camshaft 8 itself is mounted in split bearing switches 9 and 10. The fastening screws 11 for the bearing shells are fastened in the intake pipe 5, so that the housing 7 is simultaneously held on the intake pipe 5 by them.

Seitlich an das Gehäuse 7 und auf dem Zylinderkopf 1 ist ein weiteres Gehäuse 12 angeordnet. Es ist mit dem Zylinderkopf 1 über Schrauben 13, 14 und mit dem Gehäuse 7 über eine Schrauben-Muttern-Verbindung 15 befestigt. In dem Gehäuse 12 ist die Ventilbetätigungseinrichtung 16, bestehend aus je zwei Kipphebeln 17, dem Kipphebelblock 18, der an dem Gehäuseboden befestigt ist, der Kipphebelwelle 19 sowie den Ventileinstellschrauben 20 untergebracht. Das Gehäuse 12 ist durch geeignete Abstandsscheiben 21 höhengleich mit dem Gehäuse 7 angeordnet, wenn alle Gehäuse von einem gemeinsamen Deckel 22 verschließbar sind. Bei Benutzung getrennter Deckel kann dieser Höhenausgleich entfallen.Another housing 12 is arranged laterally on the housing 7 and on the cylinder head 1. It is attached to the cylinder head 1 via screws 13, 14 and to the housing 7 via a screw-nut connection 15. In the housing 12, the valve actuation device 16, each consisting of two rocker arms 17, the rocker arm block 18 which is fastened to the housing base, the rocker arm shaft 19 and the valve adjusting screws 20 are accommodated. The housing 12 is arranged at the same height as the housing 7 by means of suitable spacer disks 21 if all the housings can be closed by a common cover 22. This height compensation can be omitted when using separate lids.

Über die Kipphebel 17 wird von der Nockenwelle 8 jedes Ventil gegen die Kraft der Ventilfeder 23 betätigt. Diese ist zwischen dem oberen Ventilteller 24 und dem unteren Ventilteller 25, welcher mit der Ventilführung 26 eine Einheit bildet, eingespannt. Die Ventilführung 26 durchdringt den Boden des Gehäuses 12. Auf dem Ventilteller 25 ist ein die Ventilfeder 23 umschließender Kragen 27 angeordnet. Der Kragen 27 hat eine derartige Höhe, daß er sicher in den vom Gehäuse 12 umschlossenen Raum hineinragt. Zwischen dem Ventilteller 25 und dem Boden des Gehäuses 12 ist ein Dichtring 28 vorgesehen, dessen Stärke mit der der jeweils verwendeten Abstandsscheibe 21 korrespondiert. Dadurch ist der Gehäuseinnenraum öldicht verschlossen.Each valve is actuated by the camshaft 8 against the force of the valve spring 23 via the rocker arms 17. This is clamped between the upper valve plate 24 and the lower valve plate 25, which forms a unit with the valve guide 26. The valve guide 26 penetrates the bottom of the housing 12. A collar 27 surrounding the valve spring 23 is arranged on the valve plate 25. The collar 27 has such a height that it projects securely into the space enclosed by the housing 12. Between the valve plate 25 and the bottom of the housing 12, a sealing ring 28 is provided, the strength of which corresponds to that of the spacer 21 used in each case. The interior of the housing is thus sealed oil-tight.

Zum Austausch des Zylinderkopfes 1 wird zuerst der Deckel 22 entfernt, sodann das Gehäuse 12 gelöst. Es kann dann mitsamt den Kipphebeln 17 und deren Befestigung vom Zylinderkopf abgehoben werden. Sodann wird der Zylinderkopf 1 vom Ansaugrohr 5 gelöst und nach Lösen der Zylinderkopfschrauben kann er vom Zylinderrohr mit den Ventilen abgehoben werden.To replace the cylinder head 1, the cover 22 is first removed, then the housing 12 is released. It can then be lifted off the cylinder head together with the rocker arms 17 and their attachment. Then the cylinder head 1 is detached from the intake pipe 5 and after loosening the cylinder head screws, it can be lifted off the cylinder pipe with the valves.

In Fig. 2 ist das Gehäuse 7 einstückig mit dem Ansaugrohr 5 und das Gehäuse 12 einstückig mit dem Zylinderkopf 1 dargestellt. In diesem Fall ist für die Schrauben-Muttern-Verbindung 15 ein Langloch vorgesehen, um die unterschiedlichen Bauhöhen auszugleichen. Weiterhin ist zwischen jedem Gehäuse eine Dichtung 30 vorgesehen, sowie getrennte Deckel 31 und 32. Anstelle der aus Fig. 1 bekannten Ventilführung kann nunmehr eine handelsübliche Ventilführung 33 verwendet werden, da eine Abdichtung hier nicht mehr notwendig ist.2, the housing 7 is shown in one piece with the intake pipe 5 and the housing 12 is shown in one piece with the cylinder head 1. In this case, an elongated hole is provided for the screw-nut connection 15 in order to compensate for the different overall heights. Furthermore, a seal 30 is provided between each housing, and separate covers 31 and 32. Instead of the valve guide known from FIG. 1, a commercially available valve guide 33 can now be used, since sealing is no longer necessary here.

Weiterhin sind die Lagerböcke 34 einstückig mit dem Ansaugrohr 5 hergestellt. Dies bedingt einen wesentlich größeren Lagedurchmesser der Nockenwelle 8, da diese nun axial durch die Lagerböcke geschoben wird. Die Lagerböcke können auch geteilt sein, wobei dann das Unterteil mit Ansaugrohr einstückig ausgeführt und der Deckel angeschraubt ist.Furthermore, the bearing blocks 34 are made in one piece with the intake pipe 5. This requires a much larger position diameter of the camshaft 8, since it is now pushed axially through the bearing blocks. The bearing blocks can also be divided, in which case the lower part with the suction pipe is made in one piece and the cover is screwed on.

Es ist selbstverständlich auch möglich, eine Kombination der in Fig. 1 und Fig. 2 gezeigten Varianten der Erfindung vorzunehmen, also beispielsweise das Gehäuse 12 separat vom Zylinderkopf 1 auszubilden und das Gehäuse 7 einstückig mit dem Ansaugrohr 5.It is of course also possible to carry out a combination of the variants of the invention shown in FIGS. 1 and 2, for example to design the housing 12 separately from the cylinder head 1 and the housing 7 in one piece with the intake pipe 5.

Claims (8)

1. An air-cooled multi-cylinder internal combustion engine having an overhead camshaft (8), individual cylinder heads (1) and an induction manifold (5) flangedly secured to the cylinder heads, individual branch ducts (6) extending from the induction manifold to each air-inlet port (4) in each of the cylinder heads (1), characterized in that the induction manifold (5) is the supporting and carrying element for the comshaft (8), and in that the valves (2) are arranged to be actuated by means of known transmitting elements.
2. An air-cooled internal combustion engine according to claim 1, characterized in that the valves (2) are arranged to be actuated by means of rocker arms (17) directly operable by the cams of the camshaft (8).
3. An air-cooled internal combustion engine according to claim 1 or claim 2, characterized in that a U-shaped casing (7) for housing the camshaft (8) is fastened to the top of the induction manifold (5), and in that the casing extends over each cylinder head (1) to an extent sufficient to accommodate the valve-actuating means (16).
4. An air-cooled internal combustion engine according to claim 1 or claim 2, characterized in that the valve-actuating means (16) for each cylinder are arranged in a casing (12) separate from that of the camshaft and from that of the other cylinders.
5. An air-cooled internal combustion engine according to any of the preceding claims, characterized in that the camshaft casing (7), the camshaft (8) and the casings (12) - if separate from the camshaft casing - forthe valve-actuating means (16) are sealed by a common cover (22).
6. An air-cooled internal combustion engine according to any of the preceding claims, characterized in that the camshaft casing (7) is joined to the induction manifold (5) by means of the same bolts (11) which are used for fastening the camshaft bearings (9, 10).
7. An air-cooled internal combustion engine according to any to the preceding claims, characterized in that spacing washers (21) of different thicknesses are arranged between each separate casing (12) for the valve-actuating means (16) and its respective cylinder head (1), the washers serving to equalize the height of said casing with that of the camshaft casing (7).
8. An air-cooled internal combustion engine according to any of the preceding claims, characterized in that the bottom of each casing (12) for the valve-actuating means (16) is provided with an aperture for the passage therethrough of the valve cap (24), and in that each valve guide (26) comprises two coaxially arranged annular bushes (26, 27) of different diameters joined to each other by a stop and sealing disc (25) normal to the axes of the bushes.
EP82106215A 1981-08-06 1982-07-12 Air cooled multi-cylinder internal-combustion engine with overhead camshaft Expired EP0071778B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106215T ATE13578T1 (en) 1981-08-06 1982-07-12 AIR-COOLED, MULTI-CYLINDER, OVERHEAD CAMSHAFT ENGINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3131128 1981-08-06
DE19813131128 DE3131128A1 (en) 1981-08-06 1981-08-06 AIR-COOLED, MULTI-CYLINDER COMBUSTION ENGINE WITH OVERHEAD CAMSHAFT

Publications (3)

Publication Number Publication Date
EP0071778A2 EP0071778A2 (en) 1983-02-16
EP0071778A3 EP0071778A3 (en) 1984-02-01
EP0071778B1 true EP0071778B1 (en) 1985-05-29

Family

ID=6138716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106215A Expired EP0071778B1 (en) 1981-08-06 1982-07-12 Air cooled multi-cylinder internal-combustion engine with overhead camshaft

Country Status (5)

Country Link
US (1) US4459947A (en)
EP (1) EP0071778B1 (en)
AT (1) ATE13578T1 (en)
CA (1) CA1197423A (en)
DE (2) DE3131128A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3632799A1 (en) * 1986-09-26 1987-07-09 Josef Dipl Ing Eppinger Internal combustion engine with prolonged expansion
JP2546435B2 (en) * 1990-11-05 1996-10-23 三菱自動車工業株式会社 Cylinder head of internal combustion engine
US5511520A (en) * 1995-07-03 1996-04-30 Chrysler Corporation Cylinder head construction
US20050120992A1 (en) * 2002-06-15 2005-06-09 Ulrich Rieger Cylinder head of a reciprocating piston internal combustion engine
DE102016107121A1 (en) * 2016-04-18 2017-10-19 Man Diesel & Turbo Se Large internal combustion engine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB400552A (en) * 1933-05-29 1933-10-26 Herbert Frank Percy Purday Improvements relating to camshaft or other auxiliary shaft casings for internal combustion engines
FR853700A (en) * 1938-05-10 1940-03-26 Automobili Isotta Fraschini Fa Cylinder head for multi-cylinder in-line combustion engines
DE738432C (en) * 1939-03-09 1943-08-14 Ringhoffer Tatra Werke Ag Internal combustion engine with two rows of cylinders arranged in a V shape
DE824576C (en) * 1950-06-24 1951-12-13 Maschf Augsburg Nuernberg Ag Control drive for valve-controlled internal combustion engines
FR1094021A (en) * 1953-11-06 1955-05-11 Improvements made to internal combustion engines, especially those for special vehicles
US3139870A (en) * 1962-01-03 1964-07-07 Sampietro Achille Carlo Internal combustion engines with four valves
US3144013A (en) * 1962-04-10 1964-08-11 Renault Internal combustion engines
DE1223193B (en) * 1964-11-27 1966-08-18 Kloeckner Humboldt Deutz Ag Camshaft arrangement for multi-cylinder internal combustion engines
DE1295275B (en) * 1965-05-25 1969-05-14 Buckau Wolf Maschf R Valve-controlled multi-cylinder internal combustion engine
DE1293787B (en) * 1965-08-06 1969-04-30 Porsche Kg Valve control for internal combustion engines
CS170027B1 (en) * 1974-01-24 1976-08-27

Also Published As

Publication number Publication date
EP0071778A2 (en) 1983-02-16
DE3131128A1 (en) 1983-02-24
DE3263886D1 (en) 1985-07-04
EP0071778A3 (en) 1984-02-01
US4459947A (en) 1984-07-17
CA1197423A (en) 1985-12-03
ATE13578T1 (en) 1985-06-15

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