EP0990776A1 - Internal combustion engine with 2 cylinder banks in V arrangement - Google Patents

Internal combustion engine with 2 cylinder banks in V arrangement Download PDF

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Publication number
EP0990776A1
EP0990776A1 EP99117325A EP99117325A EP0990776A1 EP 0990776 A1 EP0990776 A1 EP 0990776A1 EP 99117325 A EP99117325 A EP 99117325A EP 99117325 A EP99117325 A EP 99117325A EP 0990776 A1 EP0990776 A1 EP 0990776A1
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EP
European Patent Office
Prior art keywords
camshaft
internal combustion
combustion engine
inlet
cylinder
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Granted
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EP99117325A
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German (de)
French (fr)
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EP0990776B1 (en
Inventor
Friedrich Prof.Dr.-Ing. Indra
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Adam Opel GmbH
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Adam Opel GmbH
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    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves

Definitions

  • the invention relates to an internal combustion engine with two cylinder banks arranged in a V-shape according to the Preamble of claim 1.
  • DE 29 47 580 A1 is a multi-cylinder Internal combustion engine described, the valves of one camshaft below via push rods and rocker arms be operated.
  • the pushrods of the intake valves are with a hydraulic pressure cylinder provided so that their effective length can be changed and so that the cylinders in question can be switched off.
  • a Such multi-cylinder internal combustion engine can also be used as a V-engine be executed.
  • Cylinder banks are also known to be single To arrange the camshaft in the space between the cylinder banks, which via pushrods both the intake valves and also the exhaust valves of both cylinder banks actuated.
  • Such an internal combustion engine is, for example, with DE 43 26 159.
  • DE 44 05 389 A1 has a V-shaped design Internal combustion engine shown in the space between a camshaft is supported in the two cylinder banks is that via push rods and rocker arms both the Intake and exhaust valves of both cylinder banks operated. A second camshaft for actuating pump elements for fuel injection is above arranged the first camshaft. Precautions for cylinder deactivation or at a variable valve opening time are not proposed with this publication or suggested.
  • the invention has for its object a To create an internal combustion engine of the type mentioned which in addition to their compact design and the possibility of cylinder deactivation through switchable Shorten the push rods also variable valve actuation times with relatively little technical effort having.
  • Exhaust valves of both cylinder banks actuated can the arrangement of only one known rotary angle adjustment device in the drive from the first to the second Camshaft on both cylinder banks variable valve opening times on the actuated by the second camshaft Valves can be realized. In general, these will be be the intake valves. It is also used in the drive the first camshaft from the crankshaft further rotation angle adjustment device is provided, then can with this the valve opening times of the exhaust valves can be variably adjusted and controlled by a Rotation angle adjustment in the drive between the first to second camshaft can also the intake valves variable opening times according to motor operation exhibit.
  • the pushrods of both the intake and The exhaust camshaft can be close together on the wall of the two cylinder banks, so that only little space is required and in the upper area of the Space between the two cylinder banks further aggregates, e.g. Parts of the intake system and the fuel processing system housed for the internal combustion engine can be.
  • the arrangement of the switching elements for optional Shorten the push rods for actuating a cylinder deactivation in the lower area of the V-shaped room between the two cylinder banks allows one very simple construction of the valve train in the area of two cylinder heads.
  • the switching elements as hydraulic elements then the hydraulic cylinder can be guided through appropriate holes in the cylinder block consequences.
  • the control of these hydraulic elements is about parallel to the camshafts in the cylinder block running holes easily and economically possible.
  • the pushrods can be advantageous in their lower area generally with a hydraulic device be provided for valve clearance compensation, this with the hydraulic elements to shorten the pushrods can be combined.
  • a crankcase 1 there are two in V-shaped cylinder banks 3 with cylinders 4, in which are pistons 5, which are by means of connecting rods 6 hinged to a crankshaft 2 mounted in the crankcase 1 are.
  • pistons 5 Above the piston 5 is in the Cylinders 4 each have a combustion chamber 7.
  • Each cylinder bank 3 carries a cylinder head 8, which closes the combustion chambers 7.
  • In the cylinder heads 8 are intake and exhaust ports arranged to the combustion chambers 7, which means Valves 9 are controllable.
  • the valves 9 are of valve springs held in the closed position.
  • rocker arms 10 On the shafts of the Valves 9 are on rocker arms 10, which are on cylinder head 8 are pivoted and with pushrods 11.12 in Connect.
  • the pushrods 11, 12, approximately run parallel to the central axes of the cylinders 4, stand with an intake camshaft 13 or Exhaust camshaft 14, both in the lower region of a formed between the two cylinder banks 3 V-shaped Room 15 are arranged in operative connection.
  • the exhaust camshaft 14 is by means of a chain drive 14 on one of the end faces of the internal combustion engine driven by the crankshaft 2.
  • the intake camshaft 13 is by means of a gear drive 17 on the other end of the engine from the exhaust camshaft 14 ago driven.
  • the Gear drive 17 with a rotation angle adjustment device provided so that the intake camshaft 13 opposite the Exhaust camshaft 14 during operation of the internal combustion engine for the purpose of changing valve opening times can be twisted.
  • Such an angle adjustment device can additionally be provided on the chain drive 16 with which then the exhaust camshaft 14 and thus that of their driven intake camshaft 13 with respect to the crankshaft 2 can be rotated. This is a far-reaching one variable adjustment of the valve opening times to the motor requirements possible.
  • the intake camshaft 13 and the exhaust camshaft 14 are in the lower area of the room 15 in one between the two cylinder banks 3 running centrally Level 18 arranged in Fig. 1 by a dash-dotted line Line is shown.
  • the intake camshaft 13 lies close above the exhaust camshaft 14.
  • the pushrods 11, 12 are on their Ends facing camshafts 13, 14 with hydraulic elements 19 provided a switchable shortening of the rods 11.12 enable. This shortening can be continuous or in stages, thus allowing adjustment the valve opening times or a complete one Switching off individual cylinders 4 at partial load of the internal combustion engine.
  • the hydraulic elements 19 are parallel to the camshafts 13, 14 in the cylinder block Driven oil channels (not shown in the drawing). In addition to the hydraulic elements 19 or with them hydraulic valve lash adjusters are connected provided that an independent compensation of the valve clearance to back up.

Abstract

With inlet (13) and outlet (14) camshafts adjoining, the two shafts act on the valves (9) via pushrods (11) and rocker arm (10) respectively for inlet and outlet channels. The outlet camshaft (14) is powered by the crankshaft (2) and the inlet camshaft (13) is powered by the outlet shaft (14) with the aid of an angle adjuster. Both camshafts (13,14) lie superposed in the cylinder bank (3) divider plane (18) and the pushrods are selectively shortened by hydraulic elements (19) which in turn work with the pushrods in response to control lines parallel to the camshafts. The elements adjust the valve stroke between maximum and zero and have a valve balancing device.

Description

Die Erfindung betrifft eine Brennkraftmaschine mit zwei in V-Form angeordneten Zylinderbänken gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to an internal combustion engine with two cylinder banks arranged in a V-shape according to the Preamble of claim 1.

Mit DE 29 47 580 A1 ist eine mehrzylindrige Brennkraftmaschine beschrieben, deren Ventile von einer unten liegenden Nockenwelle über Stösselstangen und Kipphebel betätigt werden. Die Stösselstangen der Einlaßventile sind dabei mit einem hydraulischen Druckzylinder versehen, so daß deren wirksame Länge veränderbar ist und damit die betreffenden Zylinder abschaltbar sind. Eine solche mehrzylindrige Brennkraftmaschine kann auch als V-Motor ausgeführt sein.DE 29 47 580 A1 is a multi-cylinder Internal combustion engine described, the valves of one camshaft below via push rods and rocker arms be operated. The pushrods of the intake valves are with a hydraulic pressure cylinder provided so that their effective length can be changed and so that the cylinders in question can be switched off. A Such multi-cylinder internal combustion engine can also be used as a V-engine be executed.

Bei Brennkraftmaschinen mit in V-Form angeordneten Zylinderbänken ist es auch bekannt, eine einzige Nockenwelle im Raum zwischen den Zylinderbänken anzuordnen, die über Stösselstangen sowohl die Einlaßventile als auch die Auslaßventile beider Zylinderbänke betätigt. Eine solche Brennkraftmaschine ist beispielsweise mit DE 43 26 159 beschrieben.In internal combustion engines with a V-shape Cylinder banks are also known to be single To arrange the camshaft in the space between the cylinder banks, which via pushrods both the intake valves and also the exhaust valves of both cylinder banks actuated. Such an internal combustion engine is, for example, with DE 43 26 159.

Brennkraftmaschinen dieser Art weisen gegenüber solchen mit oben liegenden Nockenwellen eine sehr kompakte Bauweise auf und können auch relativ ökonomisch gefertigt werden. Allerdings ist bei einer Brennkraftmaschine dieser Bauart eine variable Ventilbetätigungszeit, z.B. durch Verwendung geteilter schaltbarer Kipphebel und einer Nockenwelle mit unterschiedlich großen Nocken, wie sie beispielsweise mit DE 41 42 192 A1 beschrieben ist, nur mit großem Aufwand realisierbar.Internal combustion engines of this type face a very compact one with those with overhead camshafts Construction method and can also be manufactured relatively economically become. However, with an internal combustion engine this type a variable valve actuation time, e.g. by using split switchable rocker arms and a camshaft with different sized cams, like it is described for example with DE 41 42 192 A1, can only be realized with great effort.

Zur Realisierung variabler Ventilöffnungszeiten sind Vorrichtungen bekannt, mit denen eine relative Winkelverstellung einer Nockenwelle in Bezug zur Kurbelwelle oder zu einer weiteren Nockenwelle einer Brennkraftmaschine ermöglicht wird. Eine solche Vorrichtung, bei der auf der zu verstellenden Welle ein von einem Druckmedium betätigter Stellmotor mit im Volumen veränderlichen Arbeitskammern vorgesehen ist, ist z.B. mit DE 41 16 196 A1 beschrieben.To implement variable valve opening times Devices are known with which a relative angle adjustment a camshaft in relation to the crankshaft or to another camshaft of an internal combustion engine is made possible. Such a device in which on the shaft to be adjusted by a pressure medium actuated servomotor with variable working chambers is provided, e.g. with DE 41 16 196 A1 described.

Eine weitere Art solcher Vorrichtungen, bei der die beiden Trumms eines Kettentriebes für den Antrieb einer Nockenwelle über hydraulisch beaufschlagte Kolben ausgelenkt werden, ist mit DE 42 13 038 beschrieben.Another type of such devices in which the two runs of a chain drive for driving one Camshaft via hydraulically actuated pistons are deflected is described in DE 42 13 038.

Derartige Vorrichtungen sind vorgeschlagen für Brennkraftmaschinen mit zwei im Zylinderkopf angeordneten Nockenwellen, also Motoren mit erheblichem Bauaufwand und relativ großem Bauraum.Such devices are proposed for Internal combustion engines with two arranged in the cylinder head Camshafts, i.e. engines with considerable construction effort and relatively large installation space.

Mit DE 44 05 389 A1 ist eine V-förmig ausgebildete Brennkraftmaschine dargestellt, bei der im Raum zwischen den beiden Zylinderbänken eine Nockenwelle gelagert ist, die über Stösselstangen und Kipphebel sowohl die Einlaß- als auch die Auslaßventile beider Zylinderbänke betätigt. Eine zweite Nockenwelle zur Betätigung von Pumpenelementen für die Kraftstoffeinspritzung ist oberhalb der ersten Nockenwelle angeordnet. Vorkehrungen zur Zylinderabschaltung oder zu einer variablen Ventilöffnungszeit sind mit dieser Druckschrift nicht vorgeschlagen oder nahegelegt.DE 44 05 389 A1 has a V-shaped design Internal combustion engine shown in the space between a camshaft is supported in the two cylinder banks is that via push rods and rocker arms both the Intake and exhaust valves of both cylinder banks operated. A second camshaft for actuating pump elements for fuel injection is above arranged the first camshaft. Precautions for cylinder deactivation or at a variable valve opening time are not proposed with this publication or suggested.

Der Erfindung liegt die Aufgabe zugrunde, eine Brennkraftmaschine der eingangs genannten Art zu schaffen, welche neben ihrer bauartgemäßen kompakten Bauweise und der Möglichkeit der Zylinderabschaltung durch schaltbares Verkürzen der Stösselstangen auch variable Ventilbetätigungszeiten bei relativ geringem technischem Aufwand aufweist.The invention has for its object a To create an internal combustion engine of the type mentioned which in addition to their compact design and the possibility of cylinder deactivation through switchable Shorten the push rods also variable valve actuation times with relatively little technical effort having.

Die Erfindung löst diese Aufgabe mit den kennzeichnenden Merkmalen des Patentanspruches 1. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.The invention solves this problem with the characterizing Features of claim 1. Advantageous Developments of the invention are the subject of Subclaims.

Mit der Anordnung von zwei Nockenwellen im Raum zwischen den beiden Zylinderbänken, wobei die eine die Einlaßventile beider Zylinderbänke und die andere die Auslaßventile beider Zylinderbänke betätigt, können durch die Anordnung von nur einer an sich bekannten Drehwinkelverstellvorrichtung im Antrieb von der ersten zur zweiten Nockenwelle an beiden Zylinderbänken variable Ventilöffnungszeiten an den von der zweiten Nockenwelle betätigten Ventilen realisiert werden. Dies werden im allgemeinen die Einlaßventile sein. Wird darüber hinaus auch im Antrieb der ersten Nockenwelle von der Kurbelwelle her eine weitere Drehwinkelverstellvorrichtung vorgesehen, dann können mit dieser die Ventilöffnungszeiten der Auslaßventile variabel verstellt werden und durch eine gesteuerte Drehwinkelverstellung im Antrieb zwischen der ersten zur zweiten Nockenwelle können die Einlaßventile gleichfalls dem motorischen Betrieb entsprechend variable Öffnungszeiten aufweisen. With the arrangement of two camshafts in the room between the two cylinder banks, one of which is the Intake valves of both cylinder banks and the other one Exhaust valves of both cylinder banks actuated can the arrangement of only one known rotary angle adjustment device in the drive from the first to the second Camshaft on both cylinder banks variable valve opening times on the actuated by the second camshaft Valves can be realized. In general, these will be be the intake valves. It is also used in the drive the first camshaft from the crankshaft further rotation angle adjustment device is provided, then can with this the valve opening times of the exhaust valves can be variably adjusted and controlled by a Rotation angle adjustment in the drive between the first to second camshaft can also the intake valves variable opening times according to motor operation exhibit.

Besonders vorteilhaft für die Ausnutzung des Bauraumes ist es, wenn die beiden Nockenwellen in einer mittig zwischen den beiden zylinderbänken verlaufenden Ebene benachbart übereinander angeordnet sind. Der Antrieb zwischen den beiden Nockenwellen erfolgt dann nur über eine geringe Entfernung und ist beispielsweise durch einen Zahnradtrieb oder durch einen Kettentrieb mit geringem Aufwand und nahezu ohne zusätzlichen Bauraum realisierbar.Particularly advantageous for the exploitation of the Installation space is when the two camshafts are in one running in the middle between the two cylinder banks Level are arranged one above the other. The drive then only takes place between the two camshafts over a short distance and is for example by a gear drive or a chain drive with low Effort and almost realizable without additional space.

Die Stösselstangen sowohl der Einlaß- als auch der Auslaßnockenwelle können nahe beieinander an der Wand der beiden Zylinderbänke geführt werden, so daß dafür nur wenig Raum erforderlich ist und im oberen Bereich des Raumes zwischen den beiden Zylinderbänken weitere Aggregate, z.B. Teile der Ansauganlage und der Kraftstoffaufbereitungsanlage für die Brennkraftmaschine untergebracht werden können.The pushrods of both the intake and The exhaust camshaft can be close together on the wall of the two cylinder banks, so that only little space is required and in the upper area of the Space between the two cylinder banks further aggregates, e.g. Parts of the intake system and the fuel processing system housed for the internal combustion engine can be.

Die Anordnung der Schaltelemente zum wahlweisen Verkürzen der Stösselstangen für die Betätigung einer Zylinderabschaltung im unteren Bereich des V-förmigen Raumes zwischen den beiden Zylinderbänken ermöglicht einen sehr einfachen Aufbau des Ventilstriebes im Bereich der beiden Zylinderköpfe. Werden die Schaltelemente als Hydraulikelemente ausgeführt, dann kann die Führung der Hydraulikzylinder durch entsprechende Bohrungen im Zylinderblock folgen. Die Ansteuerung dieser Hydraulikelemente ist über parallel zu den Nockenwellen im Zylinderblock verlaufende Bohrungen einfach und raumökonomisch möglich.The arrangement of the switching elements for optional Shorten the push rods for actuating a cylinder deactivation in the lower area of the V-shaped room between the two cylinder banks allows one very simple construction of the valve train in the area of two cylinder heads. Are the switching elements as hydraulic elements then the hydraulic cylinder can be guided through appropriate holes in the cylinder block consequences. The control of these hydraulic elements is about parallel to the camshafts in the cylinder block running holes easily and economically possible.

Die Stösselstangen können vorteilhaft in ihrem unteren Bereich generell mit einer hydraulischen Einrichtung zum Ventilspielausgleich versehen sein, wobei diese mit den Hydraulikelementen zum Verkürzen der Stösselstangen kombiniert sein können. The pushrods can be advantageous in their lower area generally with a hydraulic device be provided for valve clearance compensation, this with the hydraulic elements to shorten the pushrods can be combined.

Durch die Anordnung aller für die durch Hydraulik verstellbaren Elemente am Grund des V-förmigen Raumes zwischen den beiden Zylinderbänken können die erforderlichen Hydraulikzuführungen kurz gehalten werden, so daß sie andere Aggregate nicht behindern.By arranging everything for by hydraulics adjustable elements at the bottom of the V-shaped room between the two cylinder banks the required Hydraulic feeds are kept short so that they do not hinder other aggregates.

Ein Ausführungsbeispiel der Erfindung ist nachstehend anhand einer Zeichnung näher beschrieben. Es zeigen

Fig. 1:
einen Schnitt durch eine Brennkraftmaschine mit zwei in V-Form angeordneten Zylinderbänken in schematisierter Form;
Fig. 2:
eine Seitenansicht der Brennkraftmaschine nach Fig. 1 in schematisierter Form.
An embodiment of the invention is described below with reference to a drawing. Show it
Fig. 1:
a section through an internal combustion engine with two V-shaped cylinder banks arranged in a schematic form;
Fig. 2:
a side view of the internal combustion engine of FIG. 1 in a schematic form.

An einem Kurbelgehäuse 1 befinden sich zwei in V-Form angeordnete Zylinderbänke 3 mit Zylindern 4, in denen sich Kolben 5 befinden, die mittels Pleuelstangen 6 an einer im Kurbelgehäuse 1 gelagerten Kurbelwelle 2 angelenkt sind. Oberhalb der Kolben 5 befindet sich in den Zylindern 4 jeweils ein Brennraum 7. Jede Zylinderbank 3 trägt einen Zylinderkopf 8, der die Brennräume 7 abschließt. In den Zylinderköpfen 8 sind Einlaß- und Auslaßkanäle zu den Brennräumen 7 angeordnet, die mittels Ventilen 9 steuerbar sind. Die Ventile 9 sind von Ventilfedern in Schließstellung gehalten. Auf den Schäften der Ventile 9 liegen Kipphebel 10 auf, die am Zylinderkopf 8 schwenkbar gelagert sind und mit Stösselstangen 11,12 in Verbindung stehen. Die Stösselstangen 11,12, die annähernd parallel zu den Mittelachsen der Zylinder 4 verlaufen, stehen mit einer Einlaßnockenwelle 13 bzw. einer Auslaßnockenwelle 14, die beide im unteren Bereich eines zwischen den beiden Zylinderbänken 3 gebildeten V-förmigen Raumes 15 angeordnet sind, in Wirkverbindung. Dabei sind die Stösselstangen 11, welche auf die Einlaßventile einwirken, alle mit der Einlaßnockenwelle 13 in Wirkverbindung. Dagegen sind die Stösselstangen 12, die auf die Auslaßventile einwirken, alle mit der Auslaßnockenwelle 14 in Wirkverbindung. Durch Betätigen der Stösselstangen 11,12 durch die Nocken der Nockenwellen 13,14 werden die ventile 9 entgegen der Kraft ihrer Schließfedern geöffnet.On a crankcase 1 there are two in V-shaped cylinder banks 3 with cylinders 4, in which are pistons 5, which are by means of connecting rods 6 hinged to a crankshaft 2 mounted in the crankcase 1 are. Above the piston 5 is in the Cylinders 4 each have a combustion chamber 7. Each cylinder bank 3 carries a cylinder head 8, which closes the combustion chambers 7. In the cylinder heads 8 are intake and exhaust ports arranged to the combustion chambers 7, which means Valves 9 are controllable. The valves 9 are of valve springs held in the closed position. On the shafts of the Valves 9 are on rocker arms 10, which are on cylinder head 8 are pivoted and with pushrods 11.12 in Connect. The pushrods 11, 12, approximately run parallel to the central axes of the cylinders 4, stand with an intake camshaft 13 or Exhaust camshaft 14, both in the lower region of a formed between the two cylinder banks 3 V-shaped Room 15 are arranged in operative connection. Here are the push rods 11, which act on the inlet valves act, all with the intake camshaft 13 in operative connection. In contrast, the pushrods 12 on the Actuate exhaust valves, all with the exhaust camshaft 14 in operative connection. By operating the push rods 11.12 by the cams of the camshafts 13.14 valves 9 opened against the force of their closing springs.

Die Auslaßnockenwelle 14 ist mittels eines Kettentriebes 14 an einer der Stirnseite der Brennkraftmaschine von der Kurbelwelle 2 angetrieben. Die Einlaß-nockenwelle 13 ist mittels eines Zahnradtriebes 17 an der anderen Stirnseite der Brennkraftmaschine von der Auslaßnockenwelle 14 her angetrieben. Selbstverständlich kann der Antrieb der Einlaßnockenwelle 13 von der Auslaßnockenwelle 14 her an der gleichen Motorstirnseite angeordnet sein, an der sich auch der Antrieb der Auslaßnockenwelle 14 von der Kurbelwelle 2 her befindet. Ebenso ist es möglich, für jeden der Antriebe entweder einen Kettentrieb oder einen Zahnradtrieb zu wählen.The exhaust camshaft 14 is by means of a chain drive 14 on one of the end faces of the internal combustion engine driven by the crankshaft 2. The intake camshaft 13 is by means of a gear drive 17 on the other end of the engine from the exhaust camshaft 14 ago driven. Of course you can driving the intake camshaft 13 from the exhaust camshaft 14 ago arranged on the same engine face be on the drive of the exhaust camshaft 14 is located from the crankshaft 2. As well it is possible to use either one for each of the drives Chain drive or a gear drive to choose.

Im vorliegenden Ausführungsbeispiel ist der Zahnradtrieb 17 mit einer Drehwinkelverstelleinrichtung versehen, so daß die Einlaßnockenwelle 13 gegenüber der Auslaßnockenwelle 14 während des Betriebes der Brennkraftmaschine zum Zwecke veränderbarer Ventilöffnungszeiten verdreht werden kann.In the present embodiment, the Gear drive 17 with a rotation angle adjustment device provided so that the intake camshaft 13 opposite the Exhaust camshaft 14 during operation of the internal combustion engine for the purpose of changing valve opening times can be twisted.

Eine solche Drehwinkelverstelleinrichtung kann zusätzlich auch am Kettentrieb 16 vorgesehen sein, mit dem dann die Auslaßnockenwelle 14 und damit auch die von ihr angetriebene Einlaßnockenwelle 13 gegenüber der Kurbelwelle 2 verdreht werden können. Damit ist eine weitgehende variable Anpassung der Ventilöffnungszeiten an die motorischen Anforderungen möglich.Such an angle adjustment device can additionally be provided on the chain drive 16 with which then the exhaust camshaft 14 and thus that of their driven intake camshaft 13 with respect to the crankshaft 2 can be rotated. This is a far-reaching one variable adjustment of the valve opening times to the motor requirements possible.

Die Einlaßnockenwelle 13 und die Auslaßnockenwelle 14 sind im unteren Bereich des Raumes 15 in einer zwischen den beiden Zylinderbänken 3 mittig verlaufenden Ebene 18 angeordnet, die in Fig. 1 durch eine strichpunktierte Linie dargestellt ist. Die Einlaßnockenwelle 13 liegt dabei nahe oberhalb der Auslaßnockenwelle 14.The intake camshaft 13 and the exhaust camshaft 14 are in the lower area of the room 15 in one between the two cylinder banks 3 running centrally Level 18 arranged in Fig. 1 by a dash-dotted line Line is shown. The intake camshaft 13 lies close above the exhaust camshaft 14.

Die Stösselstangen 11,12 sind an ihren den Nockenwellen 13,14 zugewandten Enden mit Hydraulikelementen 19 versehen, die ein schaltbares Verkürzen der Stangen 11,12 ermöglichen. Diese Verkürzung kann kontinuierlich oder in Stufen erfolgen und ermöglicht so eine Verstellung der Ventilöffnungszeiten bzw. ein vollständiges Abschalten einzelner Zylinder 4 bei Teillast der Brennkraftmaschine. Die Hydraulikelemente 19 sind von parallel zu den Nockenwellen 13,14 im Zylinderblock verlaufenden (in der Zeichnung nicht dargestellten) Ölkanälen angesteuert. Neben den Hydraulikelemeten 19 oder mit ihnen verbunden sind hydraulische Ventilspielausgleichselemente vorgesehen, die ein selbständiges ausgleichen des Ventilspiels sichern.The pushrods 11, 12 are on their Ends facing camshafts 13, 14 with hydraulic elements 19 provided a switchable shortening of the rods 11.12 enable. This shortening can be continuous or in stages, thus allowing adjustment the valve opening times or a complete one Switching off individual cylinders 4 at partial load of the internal combustion engine. The hydraulic elements 19 are parallel to the camshafts 13, 14 in the cylinder block Driven oil channels (not shown in the drawing). In addition to the hydraulic elements 19 or with them hydraulic valve lash adjusters are connected provided that an independent compensation of the valve clearance to back up.

Der besondere Vorteil der Erfindung ist darin zu sehen, daß bei einer Brennkraftmaschine mit V-förmig angeordneten Zylinderbänken auf einfache und raumsparende Weise eine Zylinderabschaltung und eine Ventilbetätigung mit variablen Steuerzeiten realisierbar ist.The particular advantage of the invention is therein to see that in an internal combustion engine with a V-shape arranged cylinder banks on simple and space-saving Way cylinder deactivation and valve actuation can be implemented with variable control times.

Claims (6)

Brennkraftmaschine mit zwei in V-Form angeordneten Zylinderbänken mit einer Kurbelwelle, mit hängenden über Kipphebel betätigten Einlaß- und Auslaßkanäle steuernden Ventilen an jedem Zylinder und mit Stösselstangen, die jeweils zwischen einer im Raum zwischen den Zylinderbänken befindlichen Nockenwelle und einem Kipphebel angeordnet sind, wobei die Stösselstangen zum Zwecke der Zylinderabschaltung über ein Schaltelement verkürzbar sind, dadurch gekennzeichnet, daß eine Einlaßnockenwelle (13) und eine Auslaßnockenwelle (14) benachbart angeordnet sind, wobei die Einlaßnockenwelle (13) über Stösselstangen (11) und Kipphebel (10) auf die Ventile (9) der Einlaßkanäle und die Auslaßnockenwelle (14) über Stösselstangen (12) und Kipphebel (10) auf die Ventile (9) der Auslaßkanäle einwirkt und wobei die Auslaßnockenwelle (14) von der Kurbelwelle (2) angetrieben ist und die Einlaßnockenwelle (13) über eine Drehwinkelverstellvorrichtung von der Auslaßnockenwelle (14) angetrieben ist.Internal combustion engine with two cylinder banks arranged in a V-shape with a crankshaft, with hanging valves on each cylinder actuated via rocker arm actuating inlet and outlet channels and with push rods, which are each arranged between a camshaft located in the space between the cylinder banks and a rocker arm, the Pushrods can be shortened via a switching element for the purpose of cylinder deactivation, characterized in that an inlet camshaft (13) and an exhaust camshaft (14) are arranged adjacent, the inlet camshaft (13) being connected to the valves (13) via pushrods (11) and rocker arms (10). 9) the inlet ducts and the exhaust camshaft (14) act on the valves (9) of the outlet ducts via push rods (12) and rocker arms (10) and the outlet camshaft (14) is driven by the crankshaft (2) and the inlet camshaft (13) via an angle of rotation adjustment device from the exhaust camshaft (14) is driven. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die beiden Nockenwellen (13,14) in einer zwischen den beiden Zylinderbänken (3) mittig verlaufenden Ebene (18) benachbart übereinander angeordnet sind.Internal combustion engine according to claim 1, characterized in that the two camshafts (13, 14) are arranged adjacent to one another in a plane (18) running centrally between the two cylinder banks (3). Brennkraftmaschine nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Schaltelemente zum wahlweisen Verkürzen der stösselstangen (11,12) Hydraulikelemente (19) sind, die jeweils mit der Stösselstange (11,12) zusammenwirken und von parallel zu den Nockenwellen (13,14) verlaufenden Steuerleitungen angesteuert sind. Internal combustion engine according to claims 1 and 2, characterized in that the switching elements for selectively shortening the push rods (11, 12) are hydraulic elements (19) which each cooperate with the push rod (11, 12) and from parallel to the camshafts (13, 14 ) running control lines are controlled. Brennkraftmaschine nach Anspruch 3, dadurch gekennzeichnet, daß mit dem Hydraulikelement (19) der Ventilhub zwischen einem Maximalhub und Nullhub stufenlos einstellbar ist.Internal combustion engine according to claim 3, characterized in that the valve stroke between a maximum stroke and zero stroke is infinitely adjustable with the hydraulic element (19). Brennkraftmaschine nach den Ansprüchen 3 und 4, dadurch gekennzeichnet, daß die Hydraulikelemente (19) eine Einrichtung zum ventilspielausgleich aufweisen.Internal combustion engine according to claims 3 and 4, characterized in that the hydraulic elements (19) have a device for valve clearance compensation. Brennkraftmaschine nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Antrieb der Auslaßnockenwelle (14) von der Kurbelwelle (2) über einen Drehwinkelverstellmechanismus erfolgt.Internal combustion engine according to one or more of claims 1 to 5, characterized in that the exhaust camshaft (14) is driven by the crankshaft (2) via a rotation angle adjustment mechanism.
EP99117325A 1998-09-23 1999-09-03 Internal combustion engine with 2 cylinder banks in V arrangement Expired - Lifetime EP0990776B1 (en)

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DE19843588 1998-09-23
DE19843588A DE19843588A1 (en) 1998-09-23 1998-09-23 Internal combustion engine with two cylinder banks arranged in a V-shape

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DE102016113054A1 (en) * 2016-07-15 2018-01-18 Man Diesel & Turbo Se Internal combustion engine and modular system for a valve train of an internal combustion engine

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