EP0271475B1 - Internal-combustion engine having two adjacent inlet valves and one opposite exhaust valve per cylinder - Google Patents

Internal-combustion engine having two adjacent inlet valves and one opposite exhaust valve per cylinder Download PDF

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Publication number
EP0271475B1
EP0271475B1 EP19870890250 EP87890250A EP0271475B1 EP 0271475 B1 EP0271475 B1 EP 0271475B1 EP 19870890250 EP19870890250 EP 19870890250 EP 87890250 A EP87890250 A EP 87890250A EP 0271475 B1 EP0271475 B1 EP 0271475B1
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EP
European Patent Office
Prior art keywords
exhaust valve
rocker
combustion engine
inlet
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP19870890250
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German (de)
French (fr)
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EP0271475A1 (en
Inventor
Gerhard Feichtinger
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AVL List GmbH
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AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • 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
    • F01L1/267—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 with means for varying the timing or the lift of the 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
    • 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
    • F02B2275/20—SOHC [Single 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 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F2001/104—Cylinders; Cylinder heads  having cooling means for liquid cooling using an open deck, i.e. the water jacket is open at the block top face
    • 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 an internal combustion engine with two adjacent intake valves per cylinder and a single opposite exhaust valve, with a camshaft which is at the same distance from the two intake valves and the exhaust valve, two rocker arm shafts running parallel to the camshaft to receive the valves that actuate the valves. rocker arms having substantially the same length dimensions are provided, the connecting line between the cam thumb and adjusting mechanism of an intake rocker arm and the exhaust rocker arm being rotated in the same direction with respect to its axis of rotation, this intake rocker arm and the exhaust rocker arm being identical and thus interchangeable.
  • a single camshaft which is at substantially the same distance from the intake valves and the exhaust valve.
  • the cams actuating the valves are arranged on a camshaft and are connected to the shaft ends of the intake and exhaust valves by two intake rocker arms and one exhaust rocker arm, which are pivotally supported by rocker arm shafts.
  • One of the intake rocker arms and the exhaust rocker arms are shaped to have the same dimensions, making these rocker arms interchangeable.
  • the pair of intake rocker arms consists of a left and a right rocker arm, i.e.
  • a four-cylinder engine has, for example, six right-hand and six left-hand rocker arms, which is a disadvantage in terms of the number of different parts, particularly with regard to machining or storage.
  • the position of the spark plug and the exhaust valve in the internal combustion engine is different from cylinder to cylinder, namely mirrored about a transverse plane between cylinders 2 and 3, which additionally causes difficulties in the manufacture of the cylinder head.
  • the object of the present invention is to avoid the above-mentioned disadvantages in an internal combustion engine which has three valves per cylinder and, in particular, to provide an internal combustion engine whose valve actuation mechanism is easier to manufacture, the number of different components also being to be reduced.
  • the number of different rocker arm types is reduced to only one, for example by using twelve left-hand rocker arms for a four-cylinder engine, which additionally have values that match in all length dimensions and are therefore fully interchangeable.
  • the warehousing is accordingly simplified and cheaper.
  • the inlet valves, the outlet valve and the spark plug are arranged congruently for all cylinders of a multi-cylinder internal combustion engine.
  • this design also simplifies the manufacture of the cylinder head, for example in the case of V-type engines the cylinder heads may be congruent but can be rotated by 180 ° , so that the exhaust ports are on the outer side of the engine block .
  • a further advantage lies in the machining of the piston surface, since any piston recesses or valve pockets can also be designed to be completely congruent, with all pistons being able to be installed in the cylinder block with the same spatial orientation, in particular in the case of in-line internal combustion engines, which simplifies the assembly process accordingly.
  • FIG. 1 shows an internal combustion engine according to the invention, partly in section along the line I-I in FIG. 2, and FIG. 2 shows a plan view of part of the internal combustion engine according to FIG. 1.
  • FIG. 1 Of the internal combustion engine according to the invention, essentially only the cylinder head 1 is shown in FIG. 1, which is attached to the cylinder block 3 with the interposition of a seal 2.
  • two inlet valves 6, each controlling inlet openings 5,5 ', and an outlet valve 8 assigned to an outlet opening 7 are provided for each cylinder 4 of the in-line internal combustion engine.
  • the two inlet openings 5 and 5 ', which open into the combustion chamber 12 arranged in the cylinder head 1, are arranged on one side of the plane 11 containing the cylinder axis 9 and running parallel to the camshaft 10.
  • the outlet opening 7 opens into the combustion chamber 12, and the spark plug 13 is located next to it.
  • the camshaft 10 is eccentric to the plane 11, which eliminates a parameter that would restrict the design of the combustion chamber 12.
  • rocker arm shafts 14 and 15 Parallel to the camshaft 10 lying between the intake and exhaust valves, two rocker arm shafts 14 and 15, each arranged at the same distance from the camshaft 10 on the cylinder head 1, are provided, with the two intake rocker arms 16 and 16 'being pivotably mounted on one rocker arm shaft 14, each by means of bearings 28 are.
  • the exhaust rocker arm 17 On the other rocker arm shaft 15 is the exhaust rocker arm 17, which is mounted in a completely identical manner.
  • rocker arms are of identical design and each have at their outer end facing the shaft end 18 of an inlet or outlet valve an adjusting mechanism 19 which interacts with this shaft end 18, and at the opposite end one with the corresponding cam inlet cam 20, 20 'or outlet cam 21 - In the engaged cam thumb 22.
  • the adjusting mechanism 19 can consist of an adjusting screw as well as an automatic, hydraulic valve adjusting mechanism.
  • Fig. 2 which includes only the area of a cylinder, it can be seen that the connecting line 23 between the cam thumb 22 and adjusting mechanism 19 of each rocker arm is pivoted in the same direction by the same angle a to the axis of rotation 24 or 25 of the rocker arm shaft 14 or 15.
  • the cam thumb 22 of the intake rocker arm 16 ' accesses the intake cam 20' shown above in FIG. 2 next to the camshaft bearing 26.
  • the next cam 20 in this order controls the second intake rocker arm 16, the exhaust cam 21 cooperating with the exhaust rocker arm 17 being arranged on the camshaft 10 between the intake cam 20 and a further camshaft bearing 26. All camshaft bearings 26 are fastened to the cylinder head 1 with screws 27.
  • the same task is performed for the exhaust rocker arm by a compression spring 30 arranged on the rocker arm shaft 15.
  • the two inlet channels are designated 31 and the outlet channel 32.
  • the two inlet valves 6, have valve springs 33 and the outlet valve has a valve spring 34, which are each supported on spring plates 35 arranged at the shaft end 18 of the 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)
  • Ignition Installations For Internal Combustion Engines (AREA)

Description

Die Erfindung bezieht sich auf eine Brennkraftmaschine mit pro Zylinder zwei nebeneinanderliegenden Einlaßventilen und einem einzigen gegenüberliegenden Auslaßventil, mit einer Nockenwelle, die zu den beiden Einlaßventilen und dem Auslaßventil den gleichen Abstand besitzt, wobei zwei parallel zur Nockenwelle verlaufende Kipphebelwellen zur Aufnahme der die Ventile betätigenden, im wesentlichen gleiche Längenabmessungen aufweisende Kipphebel vorgesehen sind, wobei die Verbindungslinie zwischen Nockendaumen und Einstellmechanismus eines Einlaßkipphebels und des Auslaßkipphebels bezüglich seiner Drehachse um den selben Winkel gleichsinnig gedreht ist, wobei dieser Einlaßkipphebel und der Auslaßkipphebel identisch und somit untereinander austauschbar sind.The invention relates to an internal combustion engine with two adjacent intake valves per cylinder and a single opposite exhaust valve, with a camshaft which is at the same distance from the two intake valves and the exhaust valve, two rocker arm shafts running parallel to the camshaft to receive the valves that actuate the valves. rocker arms having substantially the same length dimensions are provided, the connecting line between the cam thumb and adjusting mechanism of an intake rocker arm and the exhaust rocker arm being rotated in the same direction with respect to its axis of rotation, this intake rocker arm and the exhaust rocker arm being identical and thus interchangeable.

Eine Brennkraftmaschine der eingangs genannten Art, welche einen Ventilbetätigungsmechanismus zur Steuerung von zwei Ansaug- und einem Auslaßventil aufweist, ist aus der DE-OS 33 42 115 bekannt. Zwischen den beiden Einlaßventilen und dem Auslaßventil liegt eine einzige Nockenwelle, welche im, wesentlichen gleichen Abstand von den Einlaßventilen und dem Auslaßventil aufweist. Die die Ventile betätigenden Nocken sind auf einer Nockenwelle angeordnet und stehen mit den Schaftenden der Einlaß- bzw. des Auslaßventiles durch zwei Einlaßkipphebel und einem Auslaßkipphebel in Verbindung, welche schwenkbar von Kipphebelwellen getragen werden. Einer der Einlaßkipphebel und der Auslaßkipphebel sind so geformt, daß sie die gleichen Abmessungen aufweisen, womit diese Kipphebel untereinander austauschbar sind. Das Einlaßkipphebelpaar besteht dabei aus einem links- und einem rechtsorientierten Kipphebel, d.h., die Verbindungslinie Mitte Nockendaumen zur Einstellschraube ist zur Drehachse des Kipphebels nach links oder rechts gedreht. Der Auslaßkipphebel ist entweder mit dem links- oder rechtsorientierten Einlaßkipphebel austauschbar. Ein Vierzylindermotor weist beispielsweise sechs rechtsorientierte und sechs linksorientierte Kipphebel auf, was von der Anzahl der verschiedenen Teile her einen Nachteil, insbesondere im Bezug auf die Bearbeitung bzw. Lagerhaltung darstellt.An internal combustion engine of the type mentioned, which has a valve actuation mechanism for controlling two intake and one exhaust valve, is known from DE-OS 33 42 115. Between the two intake valves and the exhaust valve is a single camshaft which is at substantially the same distance from the intake valves and the exhaust valve. The cams actuating the valves are arranged on a camshaft and are connected to the shaft ends of the intake and exhaust valves by two intake rocker arms and one exhaust rocker arm, which are pivotally supported by rocker arm shafts. One of the intake rocker arms and the exhaust rocker arms are shaped to have the same dimensions, making these rocker arms interchangeable. The pair of intake rocker arms consists of a left and a right rocker arm, i.e. the connecting line between the center of the cam thumb and the adjusting screw is turned to the left or right to the axis of rotation of the rocker arm. The exhaust rocker arm is interchangeable with either the left or right hand intake rocker arm. A four-cylinder engine has, for example, six right-hand and six left-hand rocker arms, which is a disadvantage in terms of the number of different parts, particularly with regard to machining or storage.

Zusätzlich ist bei der Brennkraftmaschine die Position der Zündkerze und des Auslaßventiles von Zylinder zu Zylinder unterschiedlich, nämlich um eine Querebene zwischen Zylinder 2 und 3 gespiegelt, was zusätzlich Schwierigkeiten bei der Herstellung des Zylinderkopfes verursacht.In addition, the position of the spark plug and the exhaust valve in the internal combustion engine is different from cylinder to cylinder, namely mirrored about a transverse plane between cylinders 2 and 3, which additionally causes difficulties in the manufacture of the cylinder head.

Aufgabe der vorliegenden Erfindung ist es, bei einer Brennkraftmaschine, welche drei Ventile pro Zylinder aufweist, die obengenannten Nachteile zu vermeiden und insbesondere eine Brennkraftmaschine zu schaffen, deren Ventilbetätigungsmechanismus einfacher herstellbar ist, wobei auch die Anzahl verschiedener Bauteile verringert werden soll.The object of the present invention is to avoid the above-mentioned disadvantages in an internal combustion engine which has three valves per cylinder and, in particular, to provide an internal combustion engine whose valve actuation mechanism is easier to manufacture, the number of different components also being to be reduced.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Verbindungslinie zwischen Nockendaumen und Einstellmechanismus auch des anderen Einlaßkipphebels und des Auslaßkipphebels bezüglich seiner Drehachse um den selben Winkel a gleichsinnig gedreht ist, wobei alle drei Kipphebel identisch und somit untereinander austauschbar sind und der das Auslaßventil betätigende Auslaßkipphebel zwischen dem Nockenwellenlager und jenem Einlaßkipphebel liegt, der das dem Auslaßventil gegenüberliegende Einlaßventil betätigt. Das den Einlaßventilen gegenüberliegende Auslaßventil wird somit nicht von einem zwischen dem Einlaßnocken liegenden Auslaßnocken betätigt, sondern von einem Auslaßnocken, der neben den beiden Einlaßnocken nahe dem Nockenwellenlager liegt. Vorteilhafterweise wird damit die Anzahl der verschiedenen Kipphebelbauarten auf nur eine einzige reduziert, in dem beispielsweise für einen Vierzylindermotor zwölf linksorientierte Kipphebel verwendet werden, die zusätzlich in allen Längenabmessungen übereinstimmende Werte aufweisen und somit voll austauschbar sind. Neben einer vereinfachten Produktion - nur eine Ausführungsform muß hergestellt werden - wird somit auch die Lagerhaltung entsprechend vereinfacht und verbilligt.This object is achieved in that the connecting line between the cam thumb and the adjusting mechanism of the other intake rocker arm and the exhaust rocker arm is rotated in the same direction with respect to its axis of rotation by the same angle a, all three rocker arms being identical and thus interchangeable and the exhaust rocker arm actuating the exhaust valve between the camshaft bearing and the intake rocker arm that actuates the intake valve opposite the exhaust valve. The exhaust valve opposite the intake valves is thus not actuated by an exhaust cam located between the intake cams, but by an exhaust cam located next to the two intake cams near the camshaft bearing. Advantageously, the number of different rocker arm types is reduced to only one, for example by using twelve left-hand rocker arms for a four-cylinder engine, which additionally have values that match in all length dimensions and are therefore fully interchangeable. In addition to a simplified production - only one embodiment has to be manufactured - the warehousing is accordingly simplified and cheaper.

Von Vorteil ist es weiters, wenn nach einem weiteren Merkmal der Erfindung die Einlaßventile, das Auslaßventil und die Zündkerze für alle Zylinder einer mehrzylindrigen Brennkraftmaschine deckungsgleich angeordnet sind. Neben der vorteilhaften Verwendung nur einer Kipphebelausführung wird durch diese Ausbildung auch die Herstellung des Zylinderkopfes vereinfacht, wobei beispielsweise bei V-Motoren die Zylinderköpfe zwar deckungsgleich aber durchaus um 180° gedreht ausgebildet sein können, sodaß dann die Auslaßkanäle jeweils an der äußeren Seite des Motorblocks liegen.It is also advantageous if, according to a further feature of the invention, the inlet valves, the outlet valve and the spark plug are arranged congruently for all cylinders of a multi-cylinder internal combustion engine. In addition to the advantageous use of only one rocker arm version, this design also simplifies the manufacture of the cylinder head, for example in the case of V-type engines the cylinder heads may be congruent but can be rotated by 180 ° , so that the exhaust ports are on the outer side of the engine block .

Schließlich ist es erfindungsgemäß möglich, daß insbesondere bei einer Reihenbrennkraftmaschine die Anordnung der Einlaßventile und des Auslaßventiles, sowie der Zündkerze translationsinvariant gegenüber der Translation um den Abstand zweier Zylinder ist. Alle Bohrungs- bzw. Bearbeitungsvorgänge an einem derart ausgebildeten Zylinderkopf einer Reihenbrennkraftmaschine können somit jeweils nach einem Vorschub um einen Zylinderabstand völlig gleichartig ausgeführt werden.Finally, it is possible according to the invention that, in particular in a series internal combustion engine, the arrangement of the intake valves and the exhaust valve, as well as the spark plug, is translation-invariant compared to the translation by the distance between two cylinders. All drilling or machining operations on a cylinder head of a series internal combustion engine designed in this way can thus be carried out completely identically after each advance by a cylinder distance.

Ein weiterer Vorteil liegt in der Bearbeitung der Kolbenoberfläche, da auch allfällige Kolbenmulden bzw. Ventiltaschen völlig deckungsgleich ausgebildet werden können, wobei insbesondere bei Reihenbrennkraftmaschinen alle Kolben räumlich gleich orientiert in den Zylinderblock eingebaut werden können, was den Bestückungsvorgang entsprechend vereinfacht.A further advantage lies in the machining of the piston surface, since any piston recesses or valve pockets can also be designed to be completely congruent, with all pistons being able to be installed in the cylinder block with the same spatial orientation, in particular in the case of in-line internal combustion engines, which simplifies the assembly process accordingly.

Bei 3- bzw. 5-Zyiinder-Reihenbrennkraftmaschinen stellt sich nun nicht mehr das Problem, daß die Anzahl der rechts- bzw. linksorientierten Kipphebel differiert, wie bei herkömmlichen Brennkraftmaschinen, bei welchen dann natürlich auch eine Spiegelung um eine Querebene unmöglich ist.With 3- or 5-cylinder in-line internal combustion engines, the problem no longer arises that the number of right-hand or left-hand rocker arms differs, as in conventional internal-combustion engines, in which of course mirroring about a transverse plane is then also impossible.

Im folgenden wird die Erfindung anhand einer Reihenbrennkraftmaschine näher erläutert.The invention is explained in more detail below with the aid of an in-line internal combustion engine.

Fig. 1 zeigt eine Brennkraftmaschine nach der Erfindung teilweise geschnitten nach der Linie I-I in Fig. 2, und Fig. 2 eine Draufsicht auf einen Teil der Brennkraftmaschine nach Fig. 1.1 shows an internal combustion engine according to the invention, partly in section along the line I-I in FIG. 2, and FIG. 2 shows a plan view of part of the internal combustion engine according to FIG. 1.

Von der erfindungsgemäßen Brennkraftmaschine ist in Fig. 1 im wesentlichen nur der Zylinderkopf 1 dargestellt, welcher unter Zwischenschaltung einer Dichtung 2 auf dem Zylinderblock 3 befestigt ist. Für jeden Zylinder 4 der Reihenbrennkraftmaschine sind zwei jeweils Einlaßöffnungen 5,5' steuernde Einlaßventile 6 und ein einer Auslaßöffnung 7 zugeordnetes Auslaßventil 8 vorgesehen. Die beiden Einlaßöffnungen 5 und 5', welche in den im Zylinderkopf 1 angeordneten Brennraum 12 münden, sind dabei auf einer Seite der die Zylinderachse 9 beinhaltenden, zur Nockenwelle 10 parallel verlaufenden Ebene 11 angeordnet. Auf der gegenüberliegenden Seite der Ebene 11 mündet die Auslaßöffnung 7 in den Brennraum 12, daneben liegt die Zündkerze 13.Of the internal combustion engine according to the invention, essentially only the cylinder head 1 is shown in FIG. 1, which is attached to the cylinder block 3 with the interposition of a seal 2. For each cylinder 4 of the in-line internal combustion engine, two inlet valves 6, each controlling inlet openings 5,5 ', and an outlet valve 8 assigned to an outlet opening 7 are provided. The two inlet openings 5 and 5 ', which open into the combustion chamber 12 arranged in the cylinder head 1, are arranged on one side of the plane 11 containing the cylinder axis 9 and running parallel to the camshaft 10. On the opposite side of level 11, the outlet opening 7 opens into the combustion chamber 12, and the spark plug 13 is located next to it.

Die Nockenwelle 10 liegt zur Ebene 11 exzentrisch, wodurch ein Parameter entfällt, der die Gestaltung des Brennraumes 12 einschränken würde.The camshaft 10 is eccentric to the plane 11, which eliminates a parameter that would restrict the design of the combustion chamber 12.

Parallel zur zwischen den Ein- und Auslaßventilen liegenden Nockenwelle 10 sind zwei jeweils im gleichen Abstand zur Nockenwelle 10 am Zylinderkopf 1 angeordnete Kipphebelwellen 14 und 15 vorgesehen, wobei auf der einen Kipphebelwelle 14 die beiden Einlaßkipphebel 16 und 16', jeweils mittels Lager 28 schwenkbar gelagert sind. Auf der anderen Kipphebelwelle 15 befindet sich der völlig gleichartig gelagerte Auslaßkipphebel 17.Parallel to the camshaft 10 lying between the intake and exhaust valves, two rocker arm shafts 14 and 15, each arranged at the same distance from the camshaft 10 on the cylinder head 1, are provided, with the two intake rocker arms 16 and 16 'being pivotably mounted on one rocker arm shaft 14, each by means of bearings 28 are. On the other rocker arm shaft 15 is the exhaust rocker arm 17, which is mounted in a completely identical manner.

Alle Kipphebel sind identisch aufgebaut und weisen je an ihrem äußeren, dem Schaftende 18 eines Ein- oder Auslaßventiles zugewandten Ende einen mit diesem Schaftende 18 zusammenwirkenden Einstellmechanismus 19, sowie am gegenüberliegenden Ende einen mit dem entsprechenden Nocken - Einlaßnocken 20, 20' bzw. Auslaßnocken 21 - im Eingriff stehenden Nockendaumen 22 auf. Der Einstellmechanismus 19 kann sowohl aus einer Einstellschraube als auch aus einem automatischen, hydraulischen Ventileinstellmechanismus bestehen.All rocker arms are of identical design and each have at their outer end facing the shaft end 18 of an inlet or outlet valve an adjusting mechanism 19 which interacts with this shaft end 18, and at the opposite end one with the corresponding cam inlet cam 20, 20 'or outlet cam 21 - In the engaged cam thumb 22. The adjusting mechanism 19 can consist of an adjusting screw as well as an automatic, hydraulic valve adjusting mechanism.

Aus der Fig. 2, welche nur den Bereich eines Zylinders umfaßt, ist ersichtlich, daß die Verbindungslinie 23 zwischen Nockendaumen 22 und Einstellmechanismus 19 jedes Kipphebels gleichsinning um den selben Winkel a zur Drehachse 24 bzw. 25 der Kipphebelwelle 14 bzw. 15 verschwenkt ist. Der Nockendaumen 22 des Einlaßkipphebels 16' greift dabei auf den in Fig. 2 oben dargestellten Einlaßnocken 20' neben dem Nockenwellenlager 26 zu. Der in dieser Reihenfolge nächste Nocken 20 steuert den zweiten Einlaßkipphebel 16, wobei zwischen dem Einlaßnocken 20 und einem weiteren Nockenwellenlager 26 der mit dem Auslaßkipphebel 17 zusammenwirkende Auslaßnocken 21 auf der Nockenwelle 10 angeordnet ist. Alle Nockenwellenlager 26 sind mit Schrauben 27 am Zylinderkopf 1 befestigt.From Fig. 2, which includes only the area of a cylinder, it can be seen that the connecting line 23 between the cam thumb 22 and adjusting mechanism 19 of each rocker arm is pivoted in the same direction by the same angle a to the axis of rotation 24 or 25 of the rocker arm shaft 14 or 15. The cam thumb 22 of the intake rocker arm 16 'accesses the intake cam 20' shown above in FIG. 2 next to the camshaft bearing 26. The next cam 20 in this order controls the second intake rocker arm 16, the exhaust cam 21 cooperating with the exhaust rocker arm 17 being arranged on the camshaft 10 between the intake cam 20 and a further camshaft bearing 26. All camshaft bearings 26 are fastened to the cylinder head 1 with screws 27.

Die beiden Einlaßkipphebel 16, 16' werden durch eine zwischen den Kipphebeln auf der Kipphebelwelle 14 angeordnete Druckfeder 29 in der gewünschten Position gehalten. Die gleiche Aufgabe übernimmt für den Auslaßkipphebel eine auf der Kipphebelwelle 15 angeordnete Druckfeder 30.The two inlet rocker arms 16, 16 'are held in the desired position by a compression spring 29 arranged between the rocker arms on the rocker arm shaft 14. The same task is performed for the exhaust rocker arm by a compression spring 30 arranged on the rocker arm shaft 15.

Der Vollständigkeit halber sei noch erwähnt, daß die beiden Einlaßkanäle mit 31 und der Auslaßkanal mit 32 bezeichnet ist. Die beiden Einlaßventile 6, weisen Ventilfedern 33 und das Auslaßventil eine Ventilfeder 34 auf, welche sich jeweils an am Schaftende 18 der Ventile angeordneten Federteller 35 abstützen.For the sake of completeness, it should also be mentioned that the two inlet channels are designated 31 and the outlet channel 32. The two inlet valves 6, have valve springs 33 and the outlet valve has a valve spring 34, which are each supported on spring plates 35 arranged at the shaft end 18 of the valves.

Claims (3)

1. Internal combustion engine with, for each cylinder, two adjacent inlet valves (6) side by side and a single opposing exhaust valve (8), with a camshaft (10) which is equidistant from the two inlet valves (6) and the exhaust valve (8), two rocker shafts (14, 15) being provided, extending parallel to the camshaft for supporting the rockers (16, 16', 17) of substantially equal lengths which actuate the valves (6, 8), and the line (23) joining the cam follower (22) and the tappet (19) of an inlet valve rocker (16 or 16') and of the exhaust valve rocker (17) being turned in the same sense and through the same angle (a) with reference to its axis of rotation (24, 25), this inlet valve rocker and the exhaust valve rocker being identical and accordingly interchangeable, characterised in that the connecting line (23) between the cam follower (22) and the tappet (19) also of the other inlet valve rocker (16 or 16') and of the exhaust valve rocker (17) is turned in the same sense and through the same angle a with reference to its axis of rotation (24, 25), whereby all three rockers (16, 16', 17) are identical and accordingly interchangeable and the rocker (17) which actuates the exhaust valve (8) lying between the camshaft bearing (26) and that inlet valve rocker (16) which actuates the inlet valve (6) which lies opposite the exhaust valve (8).
2. Internal combustion engine according to claim 1, characterised in that the inlet valves (6) the exhaust valve (8) and the spark plug (13) for all the cylinders (4) of a multi-cylinder engine are arranged identically.
3. Internal combustion engine according to claim 2, characterised in that, in particular in an in-line engine, the arrangement of the inlet valves (6) and of the exhaust valve (8) and the spark plug (13) is repeated in translation of intervals spaced apart by the distance from one cylinder (4) to the next.
EP19870890250 1986-11-21 1987-11-09 Internal-combustion engine having two adjacent inlet valves and one opposite exhaust valve per cylinder Expired - Lifetime EP0271475B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3117/86 1986-11-21
AT311786A AT404389B (en) 1986-11-21 1986-11-21 INTERNAL COMBUSTION ENGINE WITH A CAMSHAFT FOR DRIVING PER CYLINDERS TWO INJECTING INLET VALVES AND A MUTUAL EXHAUST VALVE

Publications (2)

Publication Number Publication Date
EP0271475A1 EP0271475A1 (en) 1988-06-15
EP0271475B1 true EP0271475B1 (en) 1990-09-12

Family

ID=3545565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870890250 Expired - Lifetime EP0271475B1 (en) 1986-11-21 1987-11-09 Internal-combustion engine having two adjacent inlet valves and one opposite exhaust valve per cylinder

Country Status (4)

Country Link
EP (1) EP0271475B1 (en)
JP (1) JPS63205409A (en)
AT (1) AT404389B (en)
DE (1) DE3764936D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0278702U (en) * 1988-12-02 1990-06-18
DE4112496C1 (en) * 1991-04-17 1992-08-27 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Liq. cooled IC engine in-line cylinder head - has ideal line, inter-setting inlet valve centre axes at valve seats, is at specified angle to long cylinder head axis

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2048182A6 (en) * 1969-06-03 1971-03-19 Citroen Sa
DE3125077A1 (en) * 1981-06-26 1983-01-13 Bayerische Motoren Werke AG, 8000 München TWO-CYLINDER FOUR-STOCK BOXER ENGINE, ESPECIALLY DRIVE WIND AIR-COOLED FOR MOTORCYCLES
JPS5996405A (en) * 1982-11-24 1984-06-02 Yamaha Motor Co Ltd Overhead cam shaft type four-valve engine
JPS5996406A (en) * 1982-11-24 1984-06-02 Honda Motor Co Ltd Valve gear in three-valve type internal-combustion engine
US4741302A (en) * 1984-12-10 1988-05-03 Mazda Motor Corporation Internal combustion engine

Also Published As

Publication number Publication date
ATA311786A (en) 1998-03-15
EP0271475A1 (en) 1988-06-15
AT404389B (en) 1998-11-25
JPS63205409A (en) 1988-08-24
DE3764936D1 (en) 1990-10-18

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