EP0262250A1 - Four-stroke internal-combustion engine - Google Patents

Four-stroke internal-combustion engine Download PDF

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Publication number
EP0262250A1
EP0262250A1 EP86113585A EP86113585A EP0262250A1 EP 0262250 A1 EP0262250 A1 EP 0262250A1 EP 86113585 A EP86113585 A EP 86113585A EP 86113585 A EP86113585 A EP 86113585A EP 0262250 A1 EP0262250 A1 EP 0262250A1
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EP
European Patent Office
Prior art keywords
axis
valves
camshaft
rotation
tappets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86113585A
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German (de)
French (fr)
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EP0262250B1 (en
Inventor
Max Ruf
Erwin Korostenski
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Audi AG
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Audi AG
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Filing date
Publication date
Priority to DE19853524622 priority Critical patent/DE3524622A1/en
Application filed by Audi AG filed Critical Audi AG
Priority to DE8686113585T priority patent/DE3669559D1/en
Priority to EP19860113585 priority patent/EP0262250B1/en
Publication of EP0262250A1 publication Critical patent/EP0262250A1/en
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Publication of EP0262250B1 publication Critical patent/EP0262250B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/265—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder peculiar to machines or engines with three or more intake valves per cylinder
    • 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
    • F02F1/42—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
    • F02F1/4221—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder particularly for three or more inlet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • 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 four-stroke internal combustion engine according to the preamble of claim 1.
  • the invention has for its object to provide a four-stroke internal combustion engine of the type specified in the preamble of claim 1, in which a trouble-free accommodation of the tappets is possible without weakening the cylinder head.
  • the central longitudinal axes of the tappets can coincide with the central longitudinal axes of the associated valves. In this case, the valves are tilted accordingly so that their longitudinal central axes do not intersect the axis of rotation of the camshaft.
  • the longitudinal central axes of the tappets can be laterally offset from the longitudinal central axes of the associated valves. In both cases, the arrangement can be such that the cams hit the relevant tappets not in the middle, but laterally, whereby rotation of the valve tappet and the associated valve is achieved and wear is reduced.
  • the cylinder head 1 shown in the drawings has three intake valves 3, 4 and 5 and two exhaust valves 6 and 7 for each cylinder, i.e. for each combustion chamber 2.
  • Each of these valves carries at its end facing away from the combustion chamber 2 a bucket tappet 8a to 8c which is displaceably guided in a bore 9 in the cylinder head upper part 10.
  • the inlet valves 3, 4 and 5 are actuated via their bucket tappets 8a to 8c by the cams 11, 12 and 13 of a camshaft 14 indicated in FIG. 4.
  • a second camshaft 15 with cams 16 serves to actuate the exhaust valves 6, 7, only one of which is shown in the drawing.
  • the valves are pressed onto their valve seat in the usual way by springs.
  • a spark plug bore 17 is provided in the center of the combustion chamber 2.
  • the cup tappets 8a, 8b and 8c are arranged in such a way that their longitudinal central axes 18, 19 and 20 do not, as usual, intersect the axis of rotation 21 of the camshaft 14, but instead run at a distance from it.
  • the bores 9 for receiving these bucket tappets are thus offset from one another, as can be seen in FIG. 4, namely that the longitudinal center line 19 of the middle bucket tappet 8b penetrates the plane 22 through the axis of rotation 21 of the camshaft 14 at right angles to this longitudinal center axis 19 ( Fig. 2) in Figs. 2 and 4 to the right of the camshaft axis of rotation 21 at a distance a.
  • the longitudinal center axes 18 and 20 of the two outer tappets 8a and 8c penetrate said plane 20 in FIGS. 3 and 4 to the left of the camshaft axis of rotation 21 at a distance b .
  • the size of the lateral offset depends on the available space. Often it may be sufficient to arrange only the tappet 8b of the central inlet valve 4 such that its longitudinal center line 19 penetrates the plane 22 at a distance from the camshaft axis of rotation 21.
  • the lateral offset of the longitudinal center line 19 can be achieved in that the valve 4 is installed with a corresponding inclination.
  • the valve 3 or 5 can be arranged in the usual way such that its longitudinal center line 23 intersects the camshaft axis of rotation 21, but the bucket tappet 8a or 8c is arranged eccentrically to the valve 3 or 5, so that its longitudinal center axis 18 or 20 penetrates the plane 22 at a distance b from the camshaft axis of rotation 21.
  • the tappets 8a and 8c of the valves 3 and 5 are arranged in such a way that their longitudinal central axis 18 or 20 penetrates the plane 22 at a distance b in the direction of rotation D of the cam 11 or 13.
  • a relatively large valve lift and thus a large flow cross-section is achieved in the first third of the entire valve lift, in which the greatest pressure drop prevails, as a result of which Inlet valves the filling is improved and a faster pushing out of the combustion gases takes place with exhaust valves.
  • the cams 11, 12 and 13 act centrally on the cup tappets 8a, 8b and 8c.
  • three intake valves and two exhaust valves are provided per cylinder.
  • the invention is also applicable to internal combustion engines with three intake valves and three exhaust valves per cylinder, in which case the tappets of the exhaust valves are expediently arranged as described above with respect to the tappets of the intake valves.

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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)

Abstract

1. Four-stroke internal combustion engine which comprises either three inlet valves or three outlet valves or three inlet and three outlet valves per cylinder, with a first cam shaft for the inlet valves and a second cam shaft for the outlet valves, the tams of said cam shafts acting upon the valves via cup-shaped tappets, characterized in that at least the longitudinal middle axis (19) of the tappet (8b) cooperating with the intermediate valve (4) of the three inlet and/or outlet valves (3, 4, 5) penetrates the plane (22) placed through the axis of rotation (21) of the respective cam shaft (14) at right angle to said longitudinal middle axis (19) at a distance (a) from the axis of rotation (21) of the cam shaft (14).

Description

Die Erfindung bezieht sich auf eine Viertakt-Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a four-stroke internal combustion engine according to the preamble of claim 1.

Bei den bekannten Brennkraftmaschinen, bei denen die Betätigung der Gaswechselventile durch die Nocken der Nockenwelle nicht über Kipphebel erfolgt, sondern die Nocken direkt auf an den Ventilen angebrachte Tassenstößel wirken, verlaufen die Längsmittelachsen der Ventile und der hierzu konzentrischen Tassenstößel durch die Drehachse der Nockenwelle.In the known internal combustion engines, in which the actuation of the gas exchange valves by the cams of the camshaft does not take place via rocker arms, but the cams act directly on the bucket tappets attached to the valves, the longitudinal center axes of the valves and the bucket tappets concentric therewith run through the axis of rotation of the camshaft.

Bei Brennkraftmaschinen mit mehr als zwei Ventilen pro Zylinder, insbesondere mit drei Einlaßventilen und/oder drei Auslaßventilen pro Zylinder, ergeben sich jedoch erhebliche Platzprobleme hinsichtlich der Unterbringung der Tassenstößel, da die Wandstärke zwischen den die Tassenstößel aufnehmenden Bohrungen im Zylinderkopf aus Festigkeitsgründen ein bestimmtes Maß nicht unterschreiten darf. Eine Verringerung des Durchmessers des Tassenstößels ist wegen der erforderlichen Auflagefläche für den Nocken meist nicht möglich.In internal combustion engines with more than two valves per cylinder, in particular with three intake valves and / or three exhaust valves per cylinder, there are considerable space problems with regard to the accommodation of the bucket tappets, since the wall thickness between the bores in the cylinder head receiving the bucket tappets is not a certain amount for reasons of strength may fall short. A reduction in the diameter of the bucket tappet is usually not possible due to the required contact surface for the cam.

Der Erfindung liegt die Aufgabe zugrunde, eine Viertakt-Brennkraftmaschine der im Oberbegriff des Anspruchs 1 angegebenen Art zu schaffen, bei der eine problemlose Unterbringung der Tassenstößel ohne Schwächung des Zylinderkopfes möglich ist.The invention has for its object to provide a four-stroke internal combustion engine of the type specified in the preamble of claim 1, in which a trouble-free accommodation of the tappets is possible without weakening the cylinder head.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of claim 1.

Dadurch, daß bei dem erfindungsgemäßen Vorschlag die Längsmittelachse zumindest des mittleren der drei Tassenstößel, die den Einlaß- und /oder Auslaßventilen zugeordnet sind, die Drehachse der Nockenwelle nicht schneidet, sondern in einem Abstand von dieser verläuft, ergibt sich zwischen den benachbarten Tassenstößel aufnehmenden Bohrungen im Zylinderkopf eine größere Wandstärke, so daß eine ausreichende Festigkeit für den Zylinderkopf an dieser Stelle gewährleistet ist. Dieser Effekt kann noch verstärkt werden, wenn auch die Mittelachsen der Tassenstößel der beiden äußeren der drei Einlaß- und Auslaßventile gegenüber der Drehachse der Nockenwelle seitlich versetzt sind, jedoch zur anderen Seite der Nockenwelle hin.The fact that in the proposal according to the invention the longitudinal central axis of at least the middle of the three tappets, which are assigned to the intake and / or exhaust valves, does not intersect the axis of rotation of the camshaft, but rather runs at a distance therefrom, between the adjacent tappet-receiving bores in the cylinder head have a larger wall thickness, so that sufficient strength for the cylinder head is ensured at this point. This effect can be intensified if the central axes of the bucket tappets of the two outer of the three intake and exhaust valves are laterally offset with respect to the axis of rotation of the camshaft, but towards the other side of the camshaft.

Die Längsmittelachsen der Tassenstößel können mit den Längsmittelachsen der zugehörigen Ventile zusammenfallen. In diesem Fall werden die Ventile entsprechend schräg gestellt, so daß ihre Längsmittelachsen die Drehachse der Nockenwelle nicht schneiden. Alternativ können die Längsmittelachsen der Tassenstößel gegenüber den Längsmittelachsen der zugehörigen Ventile seitlich versetzt w erden. In beiden Fällen kann die Anordnung so getroffen werden, daß die Nocken auf die betreffenden Tassenstößel nicht in deren Mitte, sondern seitlich auftreffen, wodurch eine Drehung des Ventilstößels und des zugehörigen Ventils erreicht und der Verschleiß vermindert wird.The central longitudinal axes of the tappets can coincide with the central longitudinal axes of the associated valves. In this case, the valves are tilted accordingly so that their longitudinal central axes do not intersect the axis of rotation of the camshaft. Alternatively, the longitudinal central axes of the tappets can be laterally offset from the longitudinal central axes of the associated valves. In both cases, the arrangement can be such that the cams hit the relevant tappets not in the middle, but laterally, whereby rotation of the valve tappet and the associated valve is achieved and wear is reduced.

Ein Ausführungsbeispiel der Erfindung wird im folgenden unter Bezugnahme auf die Zeichnungen beschrieben. Es zeigt:

  • Fig. 1 eine Teilansicht eines Zylinderkopfes von unten mit drei Einlaßventilen und zwei Auslaßventilen pro Zylinder,
  • Fig. 2. einen Schnitt entlang Linie 2-2 in Fig. 1,
  • Fig. 3 einen Schnitt entlang Linie 3-3 in Fig. 1 in größerem Maßstab, und
  • Fig. 4 eine Teilansicht des Zylinderkopfes, aus der die Anordnung der Tassenstößel der drei Einlaßventile in bezug auf die Drehachse der diese Tassenstößel betätigenden Nockenwelle ersichtlich ist.
An embodiment of the invention is described below with reference to the drawings. It shows:
  • 1 is a partial view of a cylinder head from below with three intake valves and two exhaust valves per cylinder,
  • 2. shows a section along line 2-2 in FIG. 1,
  • Fig. 3 is a section along line 3-3 in Fig. 1 on a larger scale, and
  • Fig. 4 is a partial view of the cylinder head, from which the arrangement of the tappets of the three intake valves with respect to the axis of rotation of the camshaft actuating these tappets can be seen.

Der in den Zeichnungen dargestellte Zylinderkopf 1 weist für jeden Zylinder, d.h., für jeden Brennraum 2, drei Einlaßventile 3, 4 und 5 sowie zwei Auslaßventile 6 und 7 auf. Jedes dieser Ventile trägt an seinem vom Brennraum 2 abgewandten Ende einen Tassenstößel 8a bis 8c, der in einer Bohrung 9 im Zylinderkopfoberteil 10 verschiebbar geführt ist. Die Einlaßventile 3, 4 und 5 werden über ihre Tassenstößel 8a bis 8c von den Nocken 11, 12 und 13 einer in Fig. 4 angedeuteten Nockenwelle 14 betätigt. Zur Betätigung der Auslaßventile 6, 7 dient eine zweite Nockenwelle 15 mit Nocken 16, von denen in der Zeichnung nur einer dargestellt ist. Die Ventile werden in üblicher Weise durch Federn auf ihren Ventilsitz gedrückt. In der Mitte des Brennraumes 2 ist eine Zündkerzenbohrung 17 vorgesehen.The cylinder head 1 shown in the drawings has three intake valves 3, 4 and 5 and two exhaust valves 6 and 7 for each cylinder, i.e. for each combustion chamber 2. Each of these valves carries at its end facing away from the combustion chamber 2 a bucket tappet 8a to 8c which is displaceably guided in a bore 9 in the cylinder head upper part 10. The inlet valves 3, 4 and 5 are actuated via their bucket tappets 8a to 8c by the cams 11, 12 and 13 of a camshaft 14 indicated in FIG. 4. A second camshaft 15 with cams 16 serves to actuate the exhaust valves 6, 7, only one of which is shown in the drawing. The valves are pressed onto their valve seat in the usual way by springs. A spark plug bore 17 is provided in the center of the combustion chamber 2.

Um eine möglichst große Wandstärke zwischen benachbarten Bohrungen 9 im Zylinderkopf-Oberteil 10 zu erhalten, sind die Tassenstößel 8a, 8b und 8c so angeordnet, daß ihre Längsmittelachsen 18, 19 und 20 nicht, wie üblich, die Drehachse 21 der Nockenwelle 14 schneiden, sondern in einem Abstand von dieser verlaufen. Die Bohrungen 9 für die Aufnahme dieser Tassenstößel sind also, wie aus Fig. 4 ersichtlich, zueinander versetzt, und zwar durchstößt die Längsmittellinie 19 des mittleren Tassenstößels 8b die durch die Drehachse 21 der Nockenwelle 14 im rechten Winkel zu dieser Längsmittelachse 19 gelegten Ebene 22 (Fig. 2) in Fig. 2 und 4 rechts von der Nockenwellen-Drehachse 21 in einem Abstand ª.In order to obtain the greatest possible wall thickness between adjacent bores 9 in the cylinder head upper part 10, the cup tappets 8a, 8b and 8c are arranged in such a way that their longitudinal central axes 18, 19 and 20 do not, as usual, intersect the axis of rotation 21 of the camshaft 14, but instead run at a distance from it. The bores 9 for receiving these bucket tappets are thus offset from one another, as can be seen in FIG. 4, namely that the longitudinal center line 19 of the middle bucket tappet 8b penetrates the plane 22 through the axis of rotation 21 of the camshaft 14 at right angles to this longitudinal center axis 19 ( Fig. 2) in Figs. 2 and 4 to the right of the camshaft axis of rotation 21 at a distance ª.

Die Längsmittelachsen 18 und 20 der beiden äußeren Tassenstößel 8a und 8c durchstoßen die genannte Ebene 20 dagegen in Fig. 3 und 4 links von der Nockenwellen-Drehachse 21 in einem Abstand b. Die Größe des seitlichen Versatzes richtet sich nach den gegebenen Platzverhältnissen. Oftmals kann es ausreichend sein, nur den Tassenstößel 8b des mittleren Einlaßventils 4 so anzuordnen, daß dessen Längsmittellinie 19 die Ebene 22 in einem Abstand von der Nockenwellen-Drehachse 21 durchstößt.The longitudinal center axes 18 and 20 of the two outer tappets 8a and 8c, on the other hand, penetrate said plane 20 in FIGS. 3 and 4 to the left of the camshaft axis of rotation 21 at a distance b . The size of the lateral offset depends on the available space. Often it may be sufficient to arrange only the tappet 8b of the central inlet valve 4 such that its longitudinal center line 19 penetrates the plane 22 at a distance from the camshaft axis of rotation 21.

Wenn die übliche Anordnung gewählt wird, bei der die Längsmittelachse des Tassenstößels mit der Längsmittelachse des Ventils zusammenfällt, wie dies in Fig. 2 für das Ventil 4 und dessen Tassenstößel 8b dargestellt ist, so läßt sich der seitliche Versatz der Längsmittellinie 19 dadurch erreichen, daß das Ventil 4 mit entsprechender Schrägstellung eingebaut wird. Alternativ kann, wie Fig. 3 zeigt, das Ventil 3 bzw. 5 in üblicher Weise derart angeordnet sein, daß dessen Längsmittellinie 23 die Nockenwellen-Drehachse 21 schneidet, jedoch der Tassenstößel 8a bzw. 8c exzentrisch zum Ventil 3 bzw. 5 angeordnet wird, so daß dessen Längsmittelachse 18 bzw. 20 die Ebene 22 in einem Abstand b von der Nockenwellen-Drehachse 21 durchstößt.If the usual arrangement is chosen in which the longitudinal center axis of the tappet coincides with the longitudinal center axis of the valve, as shown in Fig. 2 for the valve 4 and its tappet 8b, the lateral offset of the longitudinal center line 19 can be achieved in that the valve 4 is installed with a corresponding inclination. Alternatively, as shown in FIG. 3, the valve 3 or 5 can be arranged in the usual way such that its longitudinal center line 23 intersects the camshaft axis of rotation 21, but the bucket tappet 8a or 8c is arranged eccentrically to the valve 3 or 5, so that its longitudinal center axis 18 or 20 penetrates the plane 22 at a distance b from the camshaft axis of rotation 21.

Wie aus Fig. 3 ersichtlich ist, sind die Tassenstößel 8a und 8c der Ventile 3 und 5 so angeordnet, daß ihre Längsmittelachse 18 bzw. 20 die Ebene 22 im Abstand b in Drehrichtung D des Nockens 11 bzw. 13 durchstößt. Dadurch wird bereits im ersten Drittel der gesamten Ventilerhebung, in welchem das größte Druckgefä lle herrscht, ein verhältnismäßig großer Ventilhub und damit ein großer Durchströmquerschnitt erreicht, wodurch bei Einlaßventilen die Füllung verbessert wird und bei Auslaßventilen ein schnelleres Ausschieben der Verbrennungsgase stattfindet.As can be seen from FIG. 3, the tappets 8a and 8c of the valves 3 and 5 are arranged in such a way that their longitudinal central axis 18 or 20 penetrates the plane 22 at a distance b in the direction of rotation D of the cam 11 or 13. As a result, a relatively large valve lift and thus a large flow cross-section is achieved in the first third of the entire valve lift, in which the greatest pressure drop prevails, as a result of which Inlet valves the filling is improved and a faster pushing out of the combustion gases takes place with exhaust valves.

In den dargestellten Ausführungsbeispielen greifen die Nocken 11, 12 und 13 zentrisch an den Tassenstößeln 8a, 8b und 8c an. Es ist jedoch auch möglich, den Angriffspunkt in Längsrichtung der Nockenwelle 14 aus dem Zentrum zu versetzen, wodurch im Betrieb eine Drehung des Tassenstößels und des zugehörigen Ventils eintritt, die zu einer Verschleißminderung beiträgt.In the exemplary embodiments shown, the cams 11, 12 and 13 act centrally on the cup tappets 8a, 8b and 8c. However, it is also possible to move the point of application in the longitudinal direction of the camshaft 14 from the center, as a result of which the cup tappet and the associated valve rotate during operation, which contributes to a reduction in wear.

Im dargestellten Ausführungsbeispiel sind pro Zylinder drei Einlaßventile und zwei Auslaßventile vorgesehen. Die Erfindung ist jedoch auch anwendbar auf Brennkraftmaschinen mit drei Einlaßventilen und drei Auslaßventilen pro Zylinder, wobei dann zweckmäßigerweise auch die Tassenstößel der Auslaßventile so angeordnet werden, wie dies vorstehend in Bezug auf die Tassenstößel der Einlaßventile beschrieben wurde. In the illustrated embodiment, three intake valves and two exhaust valves are provided per cylinder. However, the invention is also applicable to internal combustion engines with three intake valves and three exhaust valves per cylinder, in which case the tappets of the exhaust valves are expediently arranged as described above with respect to the tappets of the intake valves.

Claims (3)

1. Viertakt-Brennkraftmaschine mit drei Einlaß- und/oder Auslaßventilen pro Zylinder, einer ersten Nockenwelle für die Einlaßventile und einer zweiten Nockenwelle für die Auslaßventile, deren Nocken über Tassenstößel auf die Ventile wirken,
dadurch gekennzeichnet,
dasß zumindest die Längsmittelachse (19) des dem mittleren (4) der drei Einlaß- und/oder Auslaßventile (3, 4, 5) zugeordneten Tassenstößels (8b) die durch die Drehachse (21) der betreffenden Nockenwelle (14) im rechten Winkel zu dieser Längsmittelachse (19) gelegten Ebene (22) in einem Abstand (ª) von der Drehachse (21) der Nockenwelle (14) durchdringt.1. four-stroke internal combustion engine with three intake and / or exhaust valves per cylinder, a first camshaft for the intake valves and a second camshaft for the exhaust valves, the cams of which act on the valves via bucket tappets,
characterized,
that at least the longitudinal central axis (19) of the bucket tappet (8b) associated with the central one (4) of the three intake and / or exhaust valves (3, 4, 5) is at right angles through the axis of rotation (21) of the respective camshaft (14) plane (22) of this longitudinal center axis (19) at a distance (ª) from the axis of rotation (21) of the camshaft (14). 2. Viertakt-Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die Längsmittelachsen (18, 20) der beiden Tassenstößel (8a, 8c), die den beiden äußeren (3, 5) der drei Einlaß- und/oder Auslaßventile (3, 4, 5) zugeordnet sind, die genannte Ebene (22) ebenfalls in einem Abstand ( b), jedoch auf der anderen Seite der Nockenwellendrehachse (14) durchdringen.2. Four-stroke internal combustion engine according to claim 1, characterized in that the longitudinal central axes (18, 20) of the two tappets (8a, 8c), the two outer (3, 5) of the three intake and / or exhaust valves (3, 4th , 5) are assigned, also penetrate said plane (22) at a distance ( b ), but on the other side of the camshaft axis of rotation (14). 3. Viertakt-Brennkraftmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Längsmittelachse(n) (18, 20) des bzw. der Tassenstößel (8a, 8c) gegenüber der Längsmittelachse (23) des bzw. der betreffenden Ventile (3, 5) seitlich versetzt ist bzw. sind.3. Four-stroke internal combustion engine according to claim 1 or 2, characterized in that the longitudinal central axis (s) (18, 20) of the cup tappet (8a, 8c) relative to the longitudinal central axis (23) of the relevant valve (3, 5) is or are laterally offset.
EP19860113585 1985-07-10 1986-10-02 Four-stroke internal-combustion engine Expired - Lifetime EP0262250B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19853524622 DE3524622A1 (en) 1985-07-10 1985-07-10 Four-stroke internal combustion engine
DE8686113585T DE3669559D1 (en) 1986-10-02 1986-10-02 FOUR-STOCK COMBUSTION ENGINE.
EP19860113585 EP0262250B1 (en) 1986-10-02 1986-10-02 Four-stroke internal-combustion engine

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EP19860113585 EP0262250B1 (en) 1986-10-02 1986-10-02 Four-stroke internal-combustion engine

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EP0262250A1 true EP0262250A1 (en) 1988-04-06
EP0262250B1 EP0262250B1 (en) 1990-03-14

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DE (1) DE3669559D1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0340834A2 (en) * 1988-05-05 1989-11-08 MOTORI MODERNI s.r.l. System of valves and related operating devices for internal combustion engines having high specific horsepower
FR2656654A1 (en) * 1989-12-29 1991-07-05 Peugeot Device for actuating an internal combustion engine valve
FR2656898A1 (en) * 1990-01-11 1991-07-12 Peugeot Valve arrangement in a combustion engine
EP0436779A1 (en) * 1989-12-11 1991-07-17 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Cylinder head for internal-combustion engine
EP0444562A1 (en) * 1990-03-02 1991-09-04 FERRARI S.p.A. Timing system, particularly for an internal combustion engine with a number of valves per cylinder
US5094197A (en) * 1991-03-01 1992-03-10 Ferrari S.P.A. Timing system, particularly for an internal combustion engine with a number of valves per cyclinder
EP0994241A1 (en) * 1998-10-12 2000-04-19 Isuzu Motors Limited Valve drive mechanism for DOHC engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063385A2 (en) * 1981-04-22 1982-10-27 Yamaha Motor Co., Ltd. Four-cycle internal combustion engine
US4612885A (en) * 1984-04-11 1986-09-23 Yamaha Hatsudoki Kabushiki Kaisha Camshaft bearing arrangement for overhead cam engine
DE3524622A1 (en) * 1985-07-10 1987-01-15 Audi Ag Four-stroke internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063385A2 (en) * 1981-04-22 1982-10-27 Yamaha Motor Co., Ltd. Four-cycle internal combustion engine
US4612885A (en) * 1984-04-11 1986-09-23 Yamaha Hatsudoki Kabushiki Kaisha Camshaft bearing arrangement for overhead cam engine
DE3524622A1 (en) * 1985-07-10 1987-01-15 Audi Ag Four-stroke internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 207 (M-500)[2263], 19. Juli 1986; & JP-A-61 49 113 (YAMAHA MOTOR CO. LTD) 11-03-1986 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0340834A2 (en) * 1988-05-05 1989-11-08 MOTORI MODERNI s.r.l. System of valves and related operating devices for internal combustion engines having high specific horsepower
EP0340834A3 (en) * 1988-05-05 1990-01-31 MOTORI MODERNI s.r.l. System of valves and related operating devices for internal combustion engines having high specific horsepower
EP0436779A1 (en) * 1989-12-11 1991-07-17 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Cylinder head for internal-combustion engine
US5080057A (en) * 1989-12-11 1992-01-14 Dr. Ing. H.C.F. Porsche Ag Cylinder head of an internal-combustion engine
FR2656654A1 (en) * 1989-12-29 1991-07-05 Peugeot Device for actuating an internal combustion engine valve
FR2656898A1 (en) * 1990-01-11 1991-07-12 Peugeot Valve arrangement in a combustion engine
EP0444562A1 (en) * 1990-03-02 1991-09-04 FERRARI S.p.A. Timing system, particularly for an internal combustion engine with a number of valves per cylinder
US5094197A (en) * 1991-03-01 1992-03-10 Ferrari S.P.A. Timing system, particularly for an internal combustion engine with a number of valves per cyclinder
EP0994241A1 (en) * 1998-10-12 2000-04-19 Isuzu Motors Limited Valve drive mechanism for DOHC engine
US6276323B1 (en) 1998-10-12 2001-08-21 Isuzu Motors Limited Valve drive mechanism for DOHC engine

Also Published As

Publication number Publication date
DE3669559D1 (en) 1990-04-19
EP0262250B1 (en) 1990-03-14

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