EP0974000A1 - Multicylinder internal combustion engine with two inlet valves and two outlet valves - Google Patents

Multicylinder internal combustion engine with two inlet valves and two outlet valves

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Publication number
EP0974000A1
EP0974000A1 EP98921441A EP98921441A EP0974000A1 EP 0974000 A1 EP0974000 A1 EP 0974000A1 EP 98921441 A EP98921441 A EP 98921441A EP 98921441 A EP98921441 A EP 98921441A EP 0974000 A1 EP0974000 A1 EP 0974000A1
Authority
EP
European Patent Office
Prior art keywords
rocker arm
internal combustion
combustion engine
valves
intake
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
EP98921441A
Other languages
German (de)
French (fr)
Other versions
EP0974000B1 (en
Inventor
Manfred Breitenberger
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.)
Deutz AG
Original Assignee
Deutz AG
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Filing date
Publication date
Application filed by Deutz AG filed Critical Deutz AG
Publication of EP0974000A1 publication Critical patent/EP0974000A1/en
Application granted granted Critical
Publication of EP0974000B1 publication Critical patent/EP0974000B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L1/26—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

Definitions

  • Multi-cylinder internal combustion engine with two intake and two exhaust valves
  • the invention relates to a multi-cylinder internal combustion engine with two intake and two exhaust valves, the intake valves on the one hand and the exhaust valves on the other hand are arranged on opposite longitudinal sides of the internal combustion engine, and the intake valves and exhaust valves can be actuated by a camshaft via intake rocker arms or exhaust rocker arms.
  • both the intake rocker arms and the exhaust rocker arms are designed as fork rocker arms, one fork rocker arm actuating two valves of the same name per cylinder and in that the axes of the intake rocker arm and the exhaust rocker arm are offset from one another, preferably one above the other, with preference being given the rocker arms are rotatably mounted in a rocker arm housing mounted on the cylinder head, and wherein a bearing pin is provided per intake rocker arm, which is releasably attached to the rocker arm housing from the side of the cylinder head.
  • the available space in the rocker arm housing can be optimally used if - viewed in the axial direction - the axis of the exhaust rocker arm is arranged obliquely above the axis of the intake rocker arm per cylinder, so that the size of the cylinder head and the rocker arm housing can be significantly reduced.
  • An arrangement in which the axes of the intake rocker arms are arranged in the parting plane between rocker arm housing and cylinder head is particularly space-saving. It can in particular be provided that the exhaust rocker arms of all cylinders of a row of cylinders are mounted on a continuous bearing axis.
  • the valve axes can all be parallel to one another or can also enclose an acute angle.
  • the fork rocker arms When viewed in plan, the fork rocker arms preferably have an asymmetrical shape, as a result of which the push rods for actuating the rocker arms can be spaced relatively far apart.
  • the free space between the pushrods can be used for cylinder head bolts and the fuel supply line.
  • the axes of the intake and exhaust rocker arms are arranged on the side of the intake valves, and the intake channels and the exhaust channels of Extend the side flange surfaces on the exhaust valve side.
  • the intake manifold is arranged above the exhaust manifold, so that all gas exchange lines can be accommodated on one longitudinal side of the engine.
  • the space thus freed up on the opposite engine longitudinal side can be used to accommodate other units, for example the injection pump.
  • a preferred embodiment of the invention provides that the exhaust rocker arms of all cylinders in a row of cylinders are mounted on a continuous shaft. This makes it possible to change the timing of the exhaust valves by turning the shaft. This enables the implementation of an engine brake in a simple manner.
  • the shaft has an eccentric bearing sleeve in the region of the mounting of an exhaust rocker arm and is connected to a rotating device on an end face of the internal combustion engine.
  • a very simple and space-saving embodiment of the invention is characterized in that the bearings of the shaft are formed by bores in the rocker arm housing.
  • the stems of the inlet valves have a shorter length than the stems of the outlet valves, the valve springs of the inlet valves preferably being shorter than the valve springs of the outlet valves. It is also advantageous if the stroke of the exhaust valves is greater than the stroke of the intake valves. Inlet and outlet rocker arms can be designed with different lever ratios.
  • FIG. 1 shows a cross section through the cylinder head and rocker arm housing of the internal combustion engine according to the invention according to section II in FIG. 2
  • FIG. 2 shows a plan view of the rocker arm housing
  • FIG. 3 shows a section through the rocker arm housing according to line III-III in FIG. 2
  • Fig. 4 is a plan view of an intake rocker arm.
  • a rocker arm housing 2 screwed onto a cylinder head 1 an intake rocker arm 4 and an exhaust rocker arm 5 are provided per cylinder, the axes 4a and 5a of which, as can be seen in FIG. 1, are arranged obliquely one above the other.
  • the inlet rocker arms 4 are individually rotatably supported on journals 6 which are screwed onto the rocker arm housing 2 from the side of the cylinder head 1 by means of screws 7.
  • the axis 6a of the journals 6 lies in the parting plane 24 between the cylinder head 1 and the rocker arm housing 2.
  • the exhaust rocker arms 5 are mounted on a shaft 8 which is continuous for all cylinders of a row of cylinders and whose axis is designated 8a. Instead of a shaft 8, a continuous axis can also be provided.
  • the shaft 8 can be rotated on one end face via a rotating device 9 (not shown in more detail).
  • the exhaust rocker arms 5 are supported by slightly eccentric sleeves 10. By turning the eccentric sleeves 10, the timing of the exhaust valves 11 can be influenced and an engine braking effect can be achieved.
  • the stems 12b of the intake valves 12 have a lower height than the stems 1 1 b of the exhaust valves 1 1.
  • the valve springs for intake valves 12 and exhaust valves 1 1 can also be different Have lengths.
  • the axis 6a of the journal 6 of the inlet rocker arm 4 and the axis 8a of the shaft 8 of the outlet rocker arm 5 are on one Side of an engine longitudinal plane 14 spanned by the crankshaft axis and the cylinder axes 13.
  • the intake manifold 19 is thus arranged above the exhaust manifold 20.
  • an inlet channel can be passed between the actuating devices for the inlet valves 12.
  • the inlet duct consists of a main duct 30 (FIG. 3), which is partly formed by the rocker arm housing 2, and four sub-ducts, not shown, which each lead to an inlet valve 12 of the two cylinders.
  • One sub-channel is designed as a swirl channel for each cylinder, and one sub-channel is designed as a filling channel.
  • the filling channels start from a common cross-sectional area of a collecting space formed by the main channel 30.
  • the inlet channels 12 of two adjacent cylinders are each arranged symmetrically to a normal plane on the crankshaft axis between the two cylinders.
  • the collecting space and the main duct 30 are located in the parting plane 24 between the rocker arm housing 2 and the cylinder head 1. This makes it possible to manufacture the rocker arm housing 2 as a die-cast part.
  • a main channel 30 of the intake system is passed between the bearings of the journals 6. As described above, it branches symmetrically in a total of four sub-channels to supply two adjacent cylinders. 2 and 4, the intake rocker arms 4 and the exhaust rocker arms 5 have an asymmetrical layout, so that a free space is formed between the push rods 21 and 22 for the intake rocker arm 4 and the exhaust rocker arm 5 in the region of the engine transverse plane 23, which can be used, for example, to accommodate a fuel supply line, not shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The invention relates to a multicylinder internal combustion engine with two inlet valves and two outlet valves (12, 11), the outlet valves (11) being located on one side of an internal combustion engine and the inlet valves (12) being located on the other side. The outlet valves (11) and the inlet valves (12) are actuated by a camshaft via inlet rocker arms (4) and outlet rocker arms (5). In order to reduce the size of the cylinder heads (1) and the rocker housing (2), the inlet rocker arm (4) and the outlet rocker arm (5) are forked. Each forked rocker arm (4, 5) actuates two similar valves (12, 11) per cylinder (13). The axes (4a, 5a) of the inlet rocker arms (4) or outlet rocker arms (5) are staggered in relation to each other or preferably overlap.

Description

Mehrzylinder-Brennkraftmaschine mit zwei Einlaß- und zwei Auslaßventilen Multi-cylinder internal combustion engine with two intake and two exhaust valves
B E S C H R E I B U N GDESCRIPTION
Die Erfindung betrifft eine Mehrzylinder-Brennkraftmaschine mit zwei Einlaß- und zwei Auslaßventilen, wobei die Einlaßventile einerseits und die Auslaßventile andererseits auf gegenüberliegenden Brennkraftmaschinenlängsseiten angeordnet sind, und wobei die Einlaß- ventile und Auslaßventile durch eine Nockenwelle über Einlaßkipphebel bzw. Auslaßkipphebel betätigbar sind.The invention relates to a multi-cylinder internal combustion engine with two intake and two exhaust valves, the intake valves on the one hand and the exhaust valves on the other hand are arranged on opposite longitudinal sides of the internal combustion engine, and the intake valves and exhaust valves can be actuated by a camshaft via intake rocker arms or exhaust rocker arms.
Bei Brennkraftmaschinen der eingangs genannten Art erfordert die Unterbringung der Ventilbetätigungseinrichtung, der Kraftstoffzuführ- leitungen und der Gaswechselkanäle einen hohen Platzbedarf im Zylinderkopf und im Kipphebelgehäuse, was sich nachteilig auf die Baugröße dieser Bauteile auswirkt.In internal combustion engines of the type mentioned at the outset, accommodating the valve actuating device, the fuel supply lines and the gas exchange channels requires a large amount of space in the cylinder head and in the rocker arm housing, which has a disadvantageous effect on the size of these components.
Aus der DE 20 25 305 A ist eine Brennkraftmaschine bekannt, bei der eine teilweise Lösung der obigen Probleme erreicht wird. Dennoch ist es auch mit dieser bekannten Anordnung in vielen Fällen nicht möglich, die Platzprobleme zu lösen.From DE 20 25 305 A an internal combustion engine is known in which a partial solution to the above problems is achieved. Nevertheless, even with this known arrangement, it is not possible in many cases to solve the space problems.
Es ist die Aufgabe der Erfindung, diesen Nachteil zu vermeiden und die Baugröße des Zylinderkopfes und des Kipphebelgehäuses zu verringern. Erfindungsgemäß wird dies dadurch erreicht, daß sowohl die Einlaßkipphebel als auch die Auslaßkipphebel als Gabelkipphebel ausgeführt sind, wobei jeweils ein Gabelkipphebel zwei gleichnamige Ventile pro Zylinder betätigt und daß die Achsen der Einlaßkipphe- bei bzw. der Auslaßkipphebel gegeneinander versetzt, vorzugsweise übereinanderliegend sind, wobei bevorzugt die Kipphebel in einem auf dem Zylinderkopf aufgesetzten Kipphebelgehäuse drehbar gelagert sind, und wobei pro Einlaßkipphebel ein Lagerzapfen vorgesehen ist, der von der Seite des Zylinderkopfes am Kipphebelgehäuse lösbar befestigt ist. Der vorhandene Freiraum im Kipphebelgehäuse kann dabei optimal ausgenutzt werden, wenn - in Achsrichtung betrachtet - pro Zylinder die Achse des Auslaßkipphebels schräg über der Achse des Einlaßkipphebels angeordnet ist, so daß die Baugröße des Zylinderkopfes und des Kipphebelgehäuses deutlich reduziert werden kann. Besonders raumsparend ist eine Anordnung, bei der die Achsen der Einlaßkipphebel in der Trennebene zwischen Kipphebelgehäuse und Zylinderkopf angeordnet sind. Dabei kann insbesondere vorgesehen sein, daß die Auslaßkipphebel aller Zylinder einer Zylinderreihe auf einer durchgehenden Lagerachse gelagert sind. Die Ventilachsen können alle zueinander parallel sein, oder auch einen spitzen Winkel einschließen.It is the object of the invention to avoid this disadvantage and to reduce the size of the cylinder head and the rocker arm housing. According to the invention, this is achieved in that both the intake rocker arms and the exhaust rocker arms are designed as fork rocker arms, one fork rocker arm actuating two valves of the same name per cylinder and in that the axes of the intake rocker arm and the exhaust rocker arm are offset from one another, preferably one above the other, with preference being given the rocker arms are rotatably mounted in a rocker arm housing mounted on the cylinder head, and wherein a bearing pin is provided per intake rocker arm, which is releasably attached to the rocker arm housing from the side of the cylinder head. The available space in the rocker arm housing can be optimally used if - viewed in the axial direction - the axis of the exhaust rocker arm is arranged obliquely above the axis of the intake rocker arm per cylinder, so that the size of the cylinder head and the rocker arm housing can be significantly reduced. An arrangement in which the axes of the intake rocker arms are arranged in the parting plane between rocker arm housing and cylinder head is particularly space-saving. It can in particular be provided that the exhaust rocker arms of all cylinders of a row of cylinders are mounted on a continuous bearing axis. The valve axes can all be parallel to one another or can also enclose an acute angle.
Bevorzugt weisen die Gabelkipphebel im Grundriß betrachtet eine asymmetrische Form auf, wodurch die Stößelstangen zur Betätigung der Kipphebel relativ weit voneinander distanziert werden können. Der frei werdende Platz zwischen den Stößelstangen kann dabei für Zylinderkopfschrauben und die Kraftstoffzuführleitung benutzt werden.When viewed in plan, the fork rocker arms preferably have an asymmetrical shape, as a result of which the push rods for actuating the rocker arms can be spaced relatively far apart. The free space between the pushrods can be used for cylinder head bolts and the fuel supply line.
In einer äußerst bevorzugten Ausführungsvariante der Erfindung ist vorgesehen, daß - bezogen auf die Motorlängsebene - die Achsen der Einlaß- und Auslaßkipphebel auf der Seite der Einlaßventile angeordnet sind, und die Einlaßkanäle als auch die Auslaßkanäle von seitlichen Flanschflächen auf der Seite der Auslaßventile ausgehen. Der Einlaßsammler ist dabei über dem Auslaßkrümmer angeordnet, so daß sämtliche Gaswechselleitungen auf einer Motorlängsseite untergebracht werden können. Der dadurch auf der gegenüberlie- genden Motorlängsseite frei werdende Raum kann zur Unterbringung von anderen Aggregaten, beispielsweise der Einspritzpumpe, genutzt werden.In an extremely preferred embodiment of the invention it is provided that - with respect to the longitudinal engine plane - the axes of the intake and exhaust rocker arms are arranged on the side of the intake valves, and the intake channels and the exhaust channels of Extend the side flange surfaces on the exhaust valve side. The intake manifold is arranged above the exhaust manifold, so that all gas exchange lines can be accommodated on one longitudinal side of the engine. The space thus freed up on the opposite engine longitudinal side can be used to accommodate other units, for example the injection pump.
Eine bevorzugte Ausführung der Erfindung sieht vor, daß die Auslaß- kipphebel aller Zylinder einer Zylinderreihe auf einer durchgehenden Welle gelagert sind. Dadurch ist es möglich, die Steuerzeiten der Auslaßventile durch Verdrehen der Welle zu verändern. Dies ermöglicht auf einfache Weise die Realisierung einer Motorbremse. Dazu ist vorgesehen, daß die Welle jeweils im Bereich der Lagerung eines Auslaßkipphebels eine exzentrische Lagerhülse aufweist und mit einer Verdreheinrichtung an einer Stirnseite der Brennkraftmaschine in Verbindung steht.A preferred embodiment of the invention provides that the exhaust rocker arms of all cylinders in a row of cylinders are mounted on a continuous shaft. This makes it possible to change the timing of the exhaust valves by turning the shaft. This enables the implementation of an engine brake in a simple manner. For this purpose, it is provided that the shaft has an eccentric bearing sleeve in the region of the mounting of an exhaust rocker arm and is connected to a rotating device on an end face of the internal combustion engine.
Eine herstellungsmäßig sehr einfache und platzsparende Ausführung der Erfindung zeichnet sich dadurch aus, daß die Lager der Welle durch Bohrungen im Kipphebelgehäuse gebildet sind.A very simple and space-saving embodiment of the invention is characterized in that the bearings of the shaft are formed by bores in the rocker arm housing.
In weiterer Ausbildung der Erfindung kann vorgesehen sein, daß die Schäfte der Einlaßventile eine geringere Länge aufweisen als die Schäfte der Auslaßventile, wobei vorzugsweise die Ventilfedern der Einlaßventile kürzer sind als die Ventilfedern der Auslaßventile. Weiters ist es vorteilhaft, wenn der Hub der Auslaßventile größer ist als der Hub der Einlaßventile. Einlaß- und Auslaßkipphebeln können dabei mit unterschiedlichen Hebelübersetzungen ausgeführt sein.In a further embodiment of the invention, it can be provided that the stems of the inlet valves have a shorter length than the stems of the outlet valves, the valve springs of the inlet valves preferably being shorter than the valve springs of the outlet valves. It is also advantageous if the stroke of the exhaust valves is greater than the stroke of the intake valves. Inlet and outlet rocker arms can be designed with different lever ratios.
Die Erfindung wird anhand der Figuren näher erläutert. Es zeigen Fig. 1 einen Querschnitt durch Zylinderkopf und Kipphebelgehäuse der erfindungsgemäßen Brennkraftmaschine gemäß dem Schnitt l-l in Fig. 2, Fig. 2 eine Draufsicht auf das Kipphebelgehäuse, Fig. 3 einen Schnitt durch das Kipphebelgehäuse gemäß der Linie lll-lll in Fig. 2, und Fig. 4 eine Draufsicht auf einen Einlaßkipphebel.The invention is explained in more detail with reference to the figures. 1 shows a cross section through the cylinder head and rocker arm housing of the internal combustion engine according to the invention according to section II in FIG. 2, FIG. 2 shows a plan view of the rocker arm housing, FIG. 3 shows a section through the rocker arm housing according to line III-III in FIG. 2 , and Fig. 4 is a plan view of an intake rocker arm.
In einem auf einem Zylinderkopf 1 angeschraubten Kipphebelgehäuse 2 ist pro Zylinder ein Einlaßkipphebel 4 und ein Auslaßkipphebel 5 vorgesehen, deren Achsen 4a und 5a - wie in Fig. 1 ersichtlich ist - schräg übereinander angeordnet sind. Die Einlaßkipphebel 4 sind dabei drehbar einzeln auf Lagerzapfen 6 gelagert, welche von der Seite des Zylinderkopfes 1 über Schrauben 7 am Kipphebelgehäuse 2 angeschraubt sind. Die Achse 6a der Lagerzapfen 6 liegt in der Trennebene 24 zwischen Zylinderkopf 1 und Kipphebelgehäuse 2. Die Auslaßkipphebel 5 sind auf einer für alle Zylinder einer Zylinderreihe durchgehenden Welle 8 gelagert, deren Achse mit 8a bezeichnet ist. Statt einer Welle 8 kann auch eine durchgehende Achse vorgesehen sein.In a rocker arm housing 2 screwed onto a cylinder head 1, an intake rocker arm 4 and an exhaust rocker arm 5 are provided per cylinder, the axes 4a and 5a of which, as can be seen in FIG. 1, are arranged obliquely one above the other. The inlet rocker arms 4 are individually rotatably supported on journals 6 which are screwed onto the rocker arm housing 2 from the side of the cylinder head 1 by means of screws 7. The axis 6a of the journals 6 lies in the parting plane 24 between the cylinder head 1 and the rocker arm housing 2. The exhaust rocker arms 5 are mounted on a shaft 8 which is continuous for all cylinders of a row of cylinders and whose axis is designated 8a. Instead of a shaft 8, a continuous axis can also be provided.
Bei den in den Figuren gezeigten Ausführungsvarianten kann die Welle 8 über eine nicht näher dargestellte Verdreheinrichtung 9 an einer Stirnseite verdreht werden. Die Lagerung der Auslaßkipphebel 5 erfolgt dabei über leicht exzentrische Hülsen 10. Durch Verdrehung der exzentrischen Hülsen 10 kann die Steuerzeit der Auslaßventile 1 1 beeinflußt und damit eine Motorbremswirkung erreicht werden.In the embodiment variants shown in the figures, the shaft 8 can be rotated on one end face via a rotating device 9 (not shown in more detail). The exhaust rocker arms 5 are supported by slightly eccentric sleeves 10. By turning the eccentric sleeves 10, the timing of the exhaust valves 11 can be influenced and an engine braking effect can be achieved.
Zur optimalen Nutzung des zur Verfügung stehenden Raumes innerhalb des Zylinderkopfes 1 und des Kipphebelgehäuses 2 weisen die Schäfte 12b der Einlaßventile 12 eine geringere Höhe auf als die Schäfte 1 1 b der Auslaßventile 1 1. Auch die Ventilfedern für Einlaßventile 12 und Auslaßventile 1 1 können unterschiedliche Längen aufweisen. Die Achse 6a des Lagerzapfens 6 des Einlaßkipphebels 4 und die Achse 8a der Welle 8 des Auslaßkipphebels 5 sind auf einer Seite einer durch die Kurbelwellenachse und die Zylinderachsen 13 aufgespannten Motorlängsebene 14 angeordnet. Die Einlaßkanäle 15 und die Auslaßkanäle 16 gehen dagegen von Flanschflächen 17, 18 auf der gegenüberliegenden Seite der Motorlängsebene 14 aus, wo- bei die Einlaßflanschfläche 17 durch das Kipphebelgehäuse 2 und die Auslaßflanschfläche 18 durch den Zylinderkopf 1 gebildet werden. Der Einlaßsammler 19 ist somit über dem Auslaßkrümmer 20 angeordnet.For optimal use of the available space within the cylinder head 1 and the rocker arm housing 2, the stems 12b of the intake valves 12 have a lower height than the stems 1 1 b of the exhaust valves 1 1. The valve springs for intake valves 12 and exhaust valves 1 1 can also be different Have lengths. The axis 6a of the journal 6 of the inlet rocker arm 4 and the axis 8a of the shaft 8 of the outlet rocker arm 5 are on one Side of an engine longitudinal plane 14 spanned by the crankshaft axis and the cylinder axes 13. The inlet channels 15 and the outlet channels 16, on the other hand, originate from flange surfaces 17, 18 on the opposite side of the engine longitudinal plane 14, the inlet flange surface 17 being formed by the rocker arm housing 2 and the outlet flange surface 18 by the cylinder head 1. The intake manifold 19 is thus arranged above the exhaust manifold 20.
Zwischen den Betätigungseinrichtungen für die Einlaßventile 12 kann ein Einlaßkanal durchgeführt werden. Für jeweils zwei benachbarte Zylinder besteht der Einlaßkanal jeweils aus einem zum Teil vom Kipphebelgehäuse 2 gebildeten Hauptkanal 30 (Fig. 3) und vier nicht weiter dargestellten Teilkanälen, welche jeweils zu einem Einlaßventil 12 der beiden Zylinder führen. Pro Zylinder ist jeweils ein Teilkanal als Drallkanal, und ein Teilkanal als Füllkanal ausgebildet.An inlet channel can be passed between the actuating devices for the inlet valves 12. For each two adjacent cylinders, the inlet duct consists of a main duct 30 (FIG. 3), which is partly formed by the rocker arm housing 2, and four sub-ducts, not shown, which each lead to an inlet valve 12 of the two cylinders. One sub-channel is designed as a swirl channel for each cylinder, and one sub-channel is designed as a filling channel.
Die Füllkanäle gehen von einem gemeinsamen Querschnittsbereich eines durch den Hauptkanal 30 gebildeten Sammelraumes aus. Die Einlaßkanäle 12 zweier benachbarter Zylinder sind jeweils symmetrisch zu einer Normalebene auf die Kurbelwellenachse zwischen den beiden Zylindern angeordnet.The filling channels start from a common cross-sectional area of a collecting space formed by the main channel 30. The inlet channels 12 of two adjacent cylinders are each arranged symmetrically to a normal plane on the crankshaft axis between the two cylinders.
Der Sammelraum, sowie der Hauptkanal 30 befinden sich in der Trennebene 24 zwischen dem Kipphebelgehäuse 2 und dem Zylinderkopf 1 . Dies ermöglicht es, das Kipphebelgehäuse 2 als Druckgußteil herzustellen.The collecting space and the main duct 30 are located in the parting plane 24 between the rocker arm housing 2 and the cylinder head 1. This makes it possible to manufacture the rocker arm housing 2 as a die-cast part.
Ein Hauptkanal 30 des Ansaugsystems ist zwischen den Lagerungen der Lagerzapfen 6 hindurchgeführt. Wie oben beschrieben verzweigt er sich in symmetrischer Art in insgesamt vier Teilkanälen zur Versorgung zweier benachbarter Zylinder. Wie aus den Fig. 2 und 4 hervorgeht, weisen die Einlaßkipphebel 4 und die Auslaßkipphebel 5 eine asymmetrische Grundrißform auf, so daß zwischen den Stößelstangen 21 und 22 für den Einlaßkipphebel 4 und den Auslaßkipphebel 5 im Bereich der Motorquerebene 23 ein freier Raum gebildet wird, der beispielsweise zur Unterbringung einer nicht dargestellten Kraftstoffzuführleitung genutzt werden kann. A main channel 30 of the intake system is passed between the bearings of the journals 6. As described above, it branches symmetrically in a total of four sub-channels to supply two adjacent cylinders. 2 and 4, the intake rocker arms 4 and the exhaust rocker arms 5 have an asymmetrical layout, so that a free space is formed between the push rods 21 and 22 for the intake rocker arm 4 and the exhaust rocker arm 5 in the region of the engine transverse plane 23, which can be used, for example, to accommodate a fuel supply line, not shown.

Claims

Mehrzylinder-Brennkraftmaschine mit zwei Einlaß- und zwei AuslaßventilenA N S P R Ü C H E Multi-cylinder internal combustion engine with two intake and two exhaust valvesA NSPR Ü CHE
1 . Mehrzylinder-Brennkraftmaschine mit zwei Einlaß- und zwei Auslaßventilen (12, 1 1 ), wobei die Einlaßventile (12) einerseits und die Auslaßventile (1 1 ) andererseits auf gegenüberliegenden Brennkraftmaschinenlängsseiten angeordnet sind, und wobei die Einlaß- ventile (12) und Auslaßventile (1 1 ) durch eine Nockenwelle über Einlaßkipphebel (4) bzw. Auslaßkipphebel (5) betätigbar sind, dadurch gekennzeichnet, daß sowohl die Einlaßkipphebel (4) als auch die Auslaßkipphebel (5) als Gabelkipphebel ausgeführt sind, wobei jeweils ein Gabelkipphebel (4, 5) zwei gleichnamige Ventile (12, 1 1 ) pro Zylinder (13) betätigt und daß die Achsen (4a, 5a) der Einlaßkipphebel (4) bzw. der Auslaßkipphebel (5) gegeneinander versetzt, vorzugsweise übereinanderliegend sind.1 . Multi-cylinder internal combustion engine with two intake and two exhaust valves (12, 1 1), the intake valves (12) on the one hand and the exhaust valves (1 1) on the other being arranged on opposite longitudinal sides of the internal combustion engine, and the intake valves (12) and exhaust valves ( 1 1) can be actuated by a camshaft via intake rocker arm (4) or exhaust rocker arm (5), characterized in that both the intake rocker arm (4) and the exhaust rocker arm (5) are designed as fork rocker arms, one fork rocker arm (4, 5 ) two valves of the same name (12, 1 1) actuated per cylinder (13) and that the axes (4a, 5a) of the inlet rocker arm (4) and the outlet rocker arm (5) are offset from one another, preferably one above the other.
2. Brennkraftmaschine nach Anspruch 1 , dadurch gekennzeichnet, daß die Kipphebel (4, 5) in einem auf dem Zylinderkopf (1 ) aufgesetzten Kipphebelgehäuse (2) drehbar gelagert sind, wobei pro Einlaßkipphebel (4) ein Lagerzapfen (6) vorgesehen ist, der von der Seite des Zylinderkopfes (1 ) am Kipphebelgehäuse (2) lösbar befestigt ist.2. Internal combustion engine according to claim 1, characterized in that the rocker arms (4, 5) in a on the cylinder head (1) mounted rocker arm housing (2) are rotatably mounted, wherein a bearing pin (6) is provided per intake rocker arm (4), the is releasably attached to the rocker arm housing (2) from the side of the cylinder head (1).
3. Brennkraftmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Achsen (5a) der Auslaßkipphebel (5) einen größeren Abstand zur Zylinderkopfdichtfläche (25) aufweisen als die Achsen (4a) der Einlaßkipphebel (4). 3. Internal combustion engine according to claim 1 or 2, characterized in that the axes (5a) of the exhaust rocker arm (5) are at a greater distance from the cylinder head sealing surface (25) than the axes (4a) of the intake rocker arm (4).
4. Brennkraftmaschine nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Achsen (4a) der Einlaßkipphebel (4) in der Trennebene (24) zwischen Kipphebelgehäuse (2) und Zylinderkopf (1 ) angeordnet sind.4. Internal combustion engine according to claim 2 or 3, characterized in that the axes (4a) of the intake rocker arm (4) in the parting plane (24) between the rocker arm housing (2) and the cylinder head (1) are arranged.
5. Brennkraftmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß - in Achsrichtung betrachtet - pro Zylinder (3) die Achse (11 b) des Auslaßkipphebels (1 1 ) schräg über der Achse (12b) des Einlaßkipphebels (12) angeordnet ist.5. Internal combustion engine according to one of claims 1 to 4, characterized in that - viewed in the axial direction - per cylinder (3), the axis (11 b) of the exhaust rocker arm (1 1) obliquely above the axis (12 b) of the intake rocker arm (12) is.
6. Brennkraftmaschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Auslaßkipphebel (1 1 ) aller Zylinder (3) einer Zylinderreihe auf einer durchgehenden Lagerachse gelagert sind.6. Internal combustion engine according to one of claims 1 to 5, characterized in that the exhaust rocker arm (1 1) of all cylinders (3) of a row of cylinders are mounted on a continuous bearing axis.
7. Brennkraftmaschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Auslaßkipphebel (1 1 ) aller Zylinder (3) einer Zylinderreihe auf einer durchgehenden Welle (8) gelagert sind.7. Internal combustion engine according to one of claims 1 to 5, characterized in that the exhaust rocker arm (1 1) of all cylinders (3) of a row of cylinders are mounted on a continuous shaft (8).
8. Brennkraftmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Einlaß- und Auslaßkipphebel (4, 5) - im Grundriß betrachtet - eine asymmetrische Form aufweisen.8. Internal combustion engine according to one of claims 1 to 7, characterized in that the inlet and outlet rocker arms (4, 5) - viewed in plan - have an asymmetrical shape.
9. Brennkraftmaschine nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß - bezogen auf die Motorlängsebene (14) - die Achsen (4a, 5a) der Einlaß- und Auslaßkipphebel (4, 5) auf der Seite der Einlaßventile (12) angeordnet sind, und die Einlaßkanäle (15) als auch die Auslaßkanäle (16) von seitlichen Flanschflä- chen (17, 18) auf der Seite der Auslaßventile (1 1 ) ausgehen. 9. Internal combustion engine according to one of claims 1 to 8, characterized in that - based on the longitudinal engine plane (14) - the axes (4a, 5a) of the inlet and outlet rocker arms (4, 5) on the side of the inlet valves (12) are, and the inlet channels (15) and the outlet channels (16) from lateral flange surfaces (17, 18) on the side of the outlet valves (1 1).
10. Brennkraftmaschine nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß die Welle (8) jeweils im Bereich der Lagerung eines Auslaßkipphebels (5) eine exzentrische Lagerhülse (10) aufweist und mit einer Verdreheinrichtung (9) an einer Stirnseite der Brennkraftmaschine in Verbindung steht.10. Internal combustion engine according to one of claims 7 to 9, characterized in that the shaft (8) each in the region of the bearing of an exhaust rocker arm (5) has an eccentric bearing sleeve (10) and with a rotating device (9) on an end face of the internal combustion engine in Connection is established.
1 1. Brennkraftmaschine nach einem der Ansprüche 5 bis 10, dadurch gekennzeichnet, daß die Lager der Welle (8) durch Bohrungen im Kipphebelgehäuse (2) gebildet sind.1 1. Internal combustion engine according to one of claims 5 to 10, characterized in that the bearings of the shaft (8) are formed by bores in the rocker arm housing (2).
12. Brennkraftmaschine nach einem der Ansprüche 1 bis 11 , dadurch gekennzeichnet, daß die Schäfte (12b) der Einlaßventile (12) eine geringere Länge aufweisen als die Schäfte (1 1 b) der Auslaßventile (1 1 ), wobei vorzugsweise die Ventilfedern der Einlaßventile (12) kürzer sind als die Ventilfedern der Auslaßventile (1 1 ).12. Internal combustion engine according to one of claims 1 to 11, characterized in that the shafts (12b) of the intake valves (12) have a shorter length than the shafts (1 1 b) of the exhaust valves (1 1), preferably the valve springs of the intake valves (12) are shorter than the valve springs of the exhaust valves (1 1).
13. Brennkraftmaschine nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß der Hub der Auslaßventile (1 1 ) größer ist als der Hub der Einlaßventile (12). 13. Internal combustion engine according to one of claims 1 to 12, characterized in that the stroke of the exhaust valves (1 1) is greater than the stroke of the intake valves (12).
EP98921441A 1997-04-09 1998-04-08 Multicylinder internal combustion engine with two inlet valves and two outlet valves Expired - Lifetime EP0974000B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT60697 1997-04-09
AT0060697A AT410242B (en) 1997-04-09 1997-04-09 MULTI-CYLINDER INTERNAL COMBUSTION ENGINE WITH TWO INLET AND TWO EXHAUST VALVES
PCT/EP1998/002034 WO1998045579A1 (en) 1997-04-09 1998-04-08 Multicylinder internal combustion engine with two inlet valves and two outlet valves

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EP0974000A1 true EP0974000A1 (en) 2000-01-26
EP0974000B1 EP0974000B1 (en) 2002-12-11

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EP (1) EP0974000B1 (en)
JP (1) JP2000513068A (en)
CN (1) CN1095027C (en)
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WO1998045579A1 (en) 1998-10-15
ATA60697A (en) 2002-07-15
US6205966B1 (en) 2001-03-27
JP2000513068A (en) 2000-10-03
CN1239532A (en) 1999-12-22
EP0974000B1 (en) 2002-12-11
AT410242B (en) 2003-03-25
CN1095027C (en) 2002-11-27
DE59806629D1 (en) 2003-01-23

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