EP1002945B1 - Externally toothed wheel drive for a cam shaft of an internal combustion engine - Google Patents

Externally toothed wheel drive for a cam shaft of an internal combustion engine Download PDF

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Publication number
EP1002945B1
EP1002945B1 EP99120961A EP99120961A EP1002945B1 EP 1002945 B1 EP1002945 B1 EP 1002945B1 EP 99120961 A EP99120961 A EP 99120961A EP 99120961 A EP99120961 A EP 99120961A EP 1002945 B1 EP1002945 B1 EP 1002945B1
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EP
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Prior art keywords
camshaft
wheel
gear
rotation
crankshaft
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EP99120961A
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German (de)
French (fr)
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EP1002945A3 (en
EP1002945A4 (en
EP1002945A2 (en
Inventor
Jürgen Endeward
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Volkswagen AG
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Volkswagen AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02Valve drive
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02Valve drive
    • F01L1/026Gear drive

Definitions

  • the invention relates to a spur gear camshaft drive for an internal combustion engine with a crankcase, a crankshaft wheel and a camshaft gear according to Preamble of claim 1.
  • crankshaft gear meshing gear of the camshaft drive results with increasing number of gears between crankshaft and camshaft, as is Add tolerances and center distance inaccuracies accordingly.
  • a camshaft drive by spur gears comes, for example, only at a small distance between the crankshaft and Camshaft, ie at the bottom of the camshaft, for use. It is to Reducing the game already provided to provide helical gears, so that the quietest possible run is achieved. Nevertheless achieve such spur or.
  • the present invention is based on the object, an improved spur gear camshaft drive of the abovementioned type, the above-mentioned disadvantages are overcome and its uses without unwanted side effects in various motor vehicles, especially in Passenger cars to be extended.
  • crankshaft and Camshaft gear at least one compensating intermediate is arranged, whose axis of rotation is freely movable with respect to the crankcase.
  • the axis of rotation of the compensating intermediate wheel of at least two brackets are pivotally supported, which is located on the axis of rotation of the compensating intermediate wheel opposite ends respectively at fixed axes of rotation of the Balancing intermediate wheel adjacent wheels pivotally supported.
  • a clearance compensation directly on the camshaft is achieved in that the Balancing intermediate between the camshaft and a last intermediate the Spur gear camshaft drive is arranged. Since at this point the entire game of the Cumulated spur camshaft drive, thus resulting in a maximum clearance compensation.
  • crankshaft to Camshaft of 2: 1 in that a ratio of the number of teeth between the balance idler and an adjacent idler is selected accordingly.
  • adjacent idler for example, a crankshaft side idler.
  • FIG. 1 to 4 preferred embodiment of an inventive Spur gear camshaft drive to a crankcase 10 of an otherwise not closer illustrated internal combustion engine comprises a crankshaft 12, a first intermediate 14, a second idler 16, a balance idler 18, and a camshaft sprocket 20.
  • the second intermediate gear 16 meshes with a drive gear 22 for a not shown Water pump.
  • the crankshaft gear 12 further meshes with a drive gear 24 for a not shown oil pump and a third intermediate 26.
  • the third intermediate 26 meshes again with a fourth intermediate 28, which in turn a Drive gear 30 of a generator, not shown, and a drive gear 32 a not shown hydropump drives combing.
  • the second intermediate 16 is with a further sprocket 34 rotatably connected, wherein the second intermediate gear 16 itself with the first idler 14 and the other sprocket 34 with the balance idler 18th combs.
  • a number of teeth of the other sprocket 34 and a number of teeth of the intermediate balance gear 18 is chosen such that the crankshaft 12 for Camshaft 20 gives a translation of 2: 1.
  • An axis of rotation 36 of the compensating intermediate wheel 18 is relative to the crankcase 10 and a cylinder head freely movable and is only with respect to the axes of rotation 42, 44th from second idler gear 16 and camshaft gear 20 through two pair of brackets 38 and 40 predetermined.
  • the bracket 38 hold with one side of the axis of rotation 36 of the intermediate balance gear 18 rotatable while an opposite side of the bracket 38 at the Rotary axis 42 of the second intermediate gear 16 is supported.
  • the bracket 40 also hold with a Side the axis of rotation 36 of the balance intermediate wheel 18 rotatable while a opposite side of the bracket 38 in the cylinder head housing via the axis of rotation 44 of the Camshaft wheel 20 is supported.
  • the bracket 38 and 40 in changing Distance between the axes of rotation 42 and 44 at a varying angle to each other include so that the balance idler 18 always tight and substantially free of play meshes with both the ring gear 34 and the camshaft wheel 20.
  • the bracket 38 and 40 thus form a hinge with the hinge axis on the axis of rotation 36 of the intermediate balance gear 18, which correspondingly changing distances between the Rotary axes 42 and 44 spreads more or less widely due to thermal expansion.
  • Fig. 4 shows a hidden in Fig. 1 region of the spur gear camshaft drive in the area
  • the cam pair 40 is supported in the cylinder head housing over the Rotary axis 44 of the camshaft wheel 20 from, whereas respective the camshaft 20th opposite ends 49 of the bracket 40, the rotation axis 36 of the not shown in Fig. 4 Keep balancing idler 18.
  • a screw 48 and a sleeve 50 is the Camshaft assembly bolted, which further u.a. a donor wheel 52 and a hub 54 includes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)
  • Valve Device For Special Equipments (AREA)
  • Gear Transmission (AREA)

Abstract

At least one intermediate balance gearwheel(18) is located between the crankshaft timing gearwheel(12) and camshaft timing gearwheel(20), and the centre pin(36) of the balance gearwheel is freely movable in relation to the crankcase(10). The free movement of the centre pin of the balance wheel is brought about by two swinging arms, one(38) of which by one side rotatably holds the centre pin of the balance gearwheel while the other side is supported on the centre pin(42) of one(16) of the gearwheels. The other swinging arm by one side rotatably holds the centre pin of the balance gear while the side lying opposite the first arm is supported in the cylinder head housing via the centre pin(44) of the camshaft gear.

Description

Die Erfindung betrifft einen Stirnrad-Nockenwellenantrieb für eine Brennkraftmaschine mit einem Kurbelgehäuse, einem Kurbelwellenrad und einem Nockenwellenrad, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a spur gear camshaft drive for an internal combustion engine with a crankcase, a crankshaft wheel and a camshaft gear according to Preamble of claim 1.

In Brennkraftmaschinen mit einem Nockenwellenantrieb, welcher durch mehrere Zahnräder zwischen einer Kurbelwelle und einer Nockenwelle realisiert ist, ergeben sich durch mehrere Einflüsse Schwingungsbelastungen des Nockenwellenantriebs. So erfolgt insbesondere bei einer Diesel-Brennkraftmaschine bei einem Arbeitstakt in einem Zylinder eine relativ kräftige, jedoch kurzzeitige Anregung der Kurbelwelle, während in Zeiten zwischen jeweiligen Arbeitstakten nahezu kein Drehmoment auf die Kurbelwelle wirkt. Dies ergibt eine relativ ungleichmäßige, ungleichförmige Bewegung der Kurbelwelle mit mehr oder weniger ruckartig schwingenden Bewegung. Toleranzen bei Bauteilen des Nockenwellenantriebs führen zu entsprechendem Spiel zwischen miteinander kämmenden Zahnflanken der Zahnräder, wodurch sich Schwingungen im Nockenwellenantrieb entsprechend fortsetzten können. Ein derartiges Spiel wird zusätzlich noch dadurch verstärkt, daß häufig Stahlzahnräder bzw. für den Nockenwellenantrieb Bauteile aus Stahl Verwendung finden, wogegen das Kurbelgehäuse aus Aluminium gefertigt ist. Durch entsprechend unterschiedliche Temperaturausdehnungskoeffizienten ist somit ein Achsabstand zwischen jeweiligen Zahnrädern des Nockenwellenantriebs während des Betriebes der Brennkraftmaschine nicht mehr konstant, was zu zusätzlichem Spiel führt.In internal combustion engines with a camshaft drive, which by several gears between a crankshaft and a camshaft is realized by several Influences Vibration loads of the camshaft drive. This is done especially at a diesel internal combustion engine at a power stroke in a cylinder a relatively powerful, however, momentary excitation of the crankshaft, while in times between respective ones Working cycles almost no torque acts on the crankshaft. This gives a relative Uneven, non-uniform movement of the crankshaft with more or less jerky swinging motion. Tolerances on components of the camshaft drive lead to corresponding play between intermeshing tooth flanks of the gears, whereby vibrations in the camshaft drive can continue accordingly. One Such game is additionally reinforced by the fact that often steel gears or for the camshaft drive steel components are used, whereas the Crankcase is made of aluminum. By correspondingly different Temperature expansion coefficient is thus an axial distance between each Cog wheels of the camshaft drive during operation of the internal combustion engine not more constant, which leads to additional play.

Dieses erhöhte Spiel im Nockenwellenantrieb hat dreierlei unerwünschte Nebeneffekte. Erstens ist eine Synchronisation zwischen Kurbelwelle und Nockenwelle sozusagen verwischt, da Relativbewegungen zwischen Nockenwelle und Kurbelwelle möglich sind. Insbesondere bei Brennkraftmaschinen mit einem integrierten Pumpe-Düse-System, bei dem die Nockenwelle auch die Einspritzzeiten unmittelbar bestimmt, kommt es zu Verschiebungen der Einspritzzeiten und somit zu einem nicht optimalen Betrieb der Brennkraftmaschine. Zweitens pflanzt sich die ungleichförmige Bewegung der Kurbelwelle als Schwingung durch den Nockenwellenantrieb bis in die Nockenwelle fort und führt dort zusätzlich zu nicht genau vorbestimmten Einspritz- und Ventilbetätigungszeiten. Drittens kommt es durch das Spiel zu erhöhter Geräuschentwicklung, was in Personenkraftwagen von den Insassen als störend empfunden werden kann.This increased clearance in the camshaft drive has three undesirable side effects. First, a synchronization between the crankshaft and camshaft so to speak blurred, since relative movements between the camshaft and crankshaft are possible. In particular, in internal combustion engines with an integrated pump-nozzle system, in which the camshaft also determines the injection times directly, it comes to Shifts in the injection times and thus to a non-optimal operation of Internal combustion engine. Second, the non-uniform motion of the crankshaft is planted continues as vibration through the camshaft drive into the camshaft and leads there in addition to not exactly predetermined injection and valve actuation times. thirdly it comes through the game to increased noise, resulting in passenger cars can be perceived as disturbing by the inmates.

Ein besonders großes Spiel zwischen einem Nockenwellenzahnrad und einem letzten, mit dem Kurbelwellenzahnrad kämmenden Zahnrad des Nockenwellenantriebs ergibt sich ferner mit zunehmender Zahl der Zahnräder zwischen Kurbelwelle und Nockenwelle, da sich Toleranzen und Achsabstandsungenauigkeiten entsprechend aufsummieren.A particularly great game between a camshaft gear and a last, with Further, the crankshaft gear meshing gear of the camshaft drive results with increasing number of gears between crankshaft and camshaft, as is Add tolerances and center distance inaccuracies accordingly.

Weiter verstärkt werden oben erwähnte Schwingungen durch gegen eine Drehrichtung der Nockenwelle auf diese wirkende Kräfte, beispielsweise bei der Betätigung einer Kraftstoffpumpe eines Pumpe-Düse-Elementes, wobei ein Nocken der Nockenwelle einen großen Widerstand zu überwinden hat. Dies führt bei entsprechendem Spiel im Nockenwellenantrieb zu einer Rückwirkung auf diesen und entsprechenden Relativbewegungen zwischen Nockenwelle und Kurbelwelle mit entsprechend verschobenen Steuerzeiten für die Pumpe-Düse-Elemente und Ventile.Further amplified above-mentioned vibrations by against a direction of rotation of the Camshaft on these forces, for example, when operating a Fuel pump of a pump-nozzle element, wherein a cam of the camshaft has to overcome great resistance. This leads with appropriate play in the Camshaft drive to a reaction to this and corresponding Relative movements between camshaft and crankshaft with appropriately shifted Control times for the pump-nozzle elements and valves.

Aufgrund aller o.g. Nachteile kommt ein Nockenwellenantrieb mittels Zahnrädern bzw. Stirnrädern in Personenkraftwagen praktisch nicht zum Einsatz. Ein Nockenwellenantrieb durch Stirnräder kommt beispielsweise nur bei kleinem Abstand zwischen Kurbelwelle und Nockenwelle, also bei untenliegender Nockenwelle, zur Anwendung. Dabei ist es zur Verringerung des Spieles bereits vorgesehen, schrägverzahnte Zahnräder vorzusehen, damit ein möglichst geräuscharmer Lauf erzielt wird. Trotzdem erzielen derartige Stirnrad-bzw. Zahnrad-Nockenwellenantriebe bisher nicht den Komfort, die Laufruhe und Genauigkeit eines Nockenwellenantriebs mit Zahnriemenrädern oder Kettenrädern mit Rollenkette.Due to all o.g. Disadvantages is a camshaft drive by means of gears or Spur gears in passenger cars practically not used. A camshaft drive by spur gears comes, for example, only at a small distance between the crankshaft and Camshaft, ie at the bottom of the camshaft, for use. It is to Reducing the game already provided to provide helical gears, so that the quietest possible run is achieved. Nevertheless achieve such spur or. Gear camshaft drives so far not the comfort, smoothness and accuracy a camshaft drive with toothed belt wheels or chain wheels with roller chain.

Aus dem Selbststudienprogramm Nr. 197 "Der 2,8 l Dieselmotor im LT '97", herausgegeben von der Volkswagen AG, Wolfsburg, Stand 08/97 ist ein gattungsgemäßer Stirnrad-Nockenwellenantrieb bekannt, wobei zwischen einem Zwischenzahnrad der Nockenwelle und einem Zwischenrad des Antriebs für die Nockenwelle eine Abstandsgabel derart vorgesehen ist, daß ein vorgeschriebenes Zahnflankenspiel erreicht wird. Das Zwischenzahnrad der Nockenwelle ist dabei auf einem Einstellager-Hebel angeordnet, welcher zur Montage um eine Drehachse des Nockenwellenrades schwenkbar ist. An dem anderen Zwischenrad ist die Abstandsgabel zur Montage schwenkbar angelenkt. Nach der Montage wird die Abstandsgabel festgezogen, so daß die Drehachse des Zwischenzahnrades der Nockenwelle festgelegt ist. From the self-study program No. 197 "The 2.8 l diesel engine in the LT '97", issued from Volkswagen AG, Wolfsburg, Stand 08/97 is a generic spur camshaft drive known, between an intermediate gear of the camshaft and an idler gear of the camshaft drive such a spacer fork is provided that a prescribed backlash is achieved. The Intermediate gear of the camshaft is arranged on a Einstellager lever, which is pivotable for mounting about an axis of rotation of the camshaft sprocket. To the another idler, the distance fork is pivotally articulated for mounting. After Assembly, the distance fork is tightened so that the axis of rotation of the Intermediate gear of the camshaft is fixed.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen verbesserten Stirnrad-Nockenwellenantrieb der obengenannten Art zur Verfügung zu stellen, wobei die obengenannten Nachteile überwunden werden und dessen Einsatzmöglichkeiten ohne unerwünschte Nebeneffekte in unterschiedlichsten Kraftfahrzeugen, insbesondere in Personenkraftwagen, erweitert werden.The present invention is based on the object, an improved spur gear camshaft drive of the abovementioned type, the above-mentioned disadvantages are overcome and its uses without unwanted side effects in various motor vehicles, especially in Passenger cars to be extended.

Diese Aufgabe wird erfindungsgemäß durch einen Zahnrad-Nockenwellenantrieb der o.g. Art mit den in Anspruch 1 gekennzeichneten Merkmalen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen angegeben.This object is achieved by a gear camshaft drive o.g. kind solved with the features characterized in claim 1. Advantageous embodiments of Invention are given in the dependent claims.

Dazu ist es erfindungsgemäß vorgesehen, daß zwischen Kurbelwellenrad und Nockenwellenrad wenigstens ein Ausgleich-Zwischenrad angeordnet ist, dessen Drehachse bezüglich des Kurbelgehäuses frei beweglich ist.For this purpose, it is provided according to the invention that between crankshaft and Camshaft gear at least one compensating intermediate is arranged, whose axis of rotation is freely movable with respect to the crankcase.

Dies hat den Vorteil, daß das bewegliche Ausgleich-Zwischenrad einen sich ändernden Abstand von Drehachsen zwischen zwei benachbarten Zahnrädern durch eine entsprechende Relativbewegung der Drehachse des Ausgleich-Zwischenrades kompensiert, so daß auch bei sich änderndem Abstand der Drehachsen der benachbarten Zahnräder kein Spiel auftritt. Hierdurch werden Steuerzeiten durch die Nockenwelle genauer eingehalten und es ergibt sich ein geräuscharmer Lauf des Stirnrad-Nockenwellenantriebs.This has the advantage that the movable balance idler changing a Distance from axes of rotation between two adjacent gears through a compensates for the corresponding relative movement of the axis of rotation of the compensating intermediate gear, so that even with changing distance of the axes of rotation of the adjacent gears no Game occurs. As a result, control times are more accurately maintained by the camshaft and This results in a quiet running of the spur gear camshaft drive.

In einer bevorzugten Ausführungsform ist die Drehachse des Ausgleich-Zwischenrades von wenigstens zwei Bügeln schwenkbar gehaltert, welche sich an der Drehachse des Ausgleich-Zwischenrades gegenüberliegenden Enden jeweils an festen Drehachsen von zum Ausgleich-Zwischenrad benachbarten Zahnrädern schwenkbar abstützten.In a preferred embodiment, the axis of rotation of the compensating intermediate wheel of at least two brackets are pivotally supported, which is located on the axis of rotation of the compensating intermediate wheel opposite ends respectively at fixed axes of rotation of the Balancing intermediate wheel adjacent wheels pivotally supported.

Einen Spielausgleich unmittelbar an der Nockenwelle erzielt man dadurch, daß das Ausgleich-Zwischenrad zwischen dem Nockenwellenrad und einem letzten Zwischenrad des Stirnrad-Nockenwellenantrieb angeordnet ist. Da sich an dieser Stelle das gesamte Spiel des Stirnrad-Nockenwellenantrieb aufsummiert, ergibt sich somit ein maximaler Spielausgleich.A clearance compensation directly on the camshaft is achieved in that the Balancing intermediate between the camshaft and a last intermediate the Spur gear camshaft drive is arranged. Since at this point the entire game of the Cumulated spur camshaft drive, thus resulting in a maximum clearance compensation.

Zweckmäßigerweise erzielt man ein Übersetzungsverhältnis von der Kurbelwelle zur Nockenwelle von 2:1 dadurch, daß ein Verhältnis der Zähnezahl zwischen dem Ausgleich-Zwischenrad und einem benachbarten Zwischenrad entsprechend gewählt ist. Hierbei ist das benachbarte Zwischenrad beispielsweise ein kurbelwellenseitiges Zwischenrad. Conveniently, one achieves a gear ratio of the crankshaft to Camshaft of 2: 1 in that a ratio of the number of teeth between the balance idler and an adjacent idler is selected accordingly. Here it is adjacent idler, for example, a crankshaft side idler.

Weitere Merkmale, Vorteile und vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den abhängigen Ansprüchen, sowie aus der nachstehenden Beschreibung der Erfindung anhand der beigefügten Zeichnungen. Diese zeigen in

Fig. 1
eine bevorzugte Ausführungsform eines erfindungsgemäßen Stirnrad-Nockenwellenantriebs in Aufsicht,
Fig. 2
eine Schnittansicht entlang Linie l-l von Fig. 1 und
Fig. 3 und 4
Explosionsdarstellungen.
Further features, advantages and advantageous embodiments of the invention will become apparent from the dependent claims, and from the following description of the invention with reference to the accompanying drawings. These show in
Fig. 1
a preferred embodiment of a spur gear camshaft drive according to the invention in supervision,
Fig. 2
a sectional view taken along line II of Fig. 1 and
3 and 4
Exploded views.

Die in Fig. 1 bis 4 dargestellte bevorzugte Ausführungsform eines erfindungsgemäßen Stirnrad-Nockenwellenantriebs an einem Kurbelgehäuse 10 einer ansonsten nicht näher dargestellten Brennkraftmaschine umfaßt ein Kurbelwellenrad 12, ein erstes Zwischenrad 14, ein zweites Zwischenrad 16, ein Ausgleich-Zwischenrad 18 und ein Nockenwellenrad 20.The illustrated in Fig. 1 to 4 preferred embodiment of an inventive Spur gear camshaft drive to a crankcase 10 of an otherwise not closer illustrated internal combustion engine comprises a crankshaft 12, a first intermediate 14, a second idler 16, a balance idler 18, and a camshaft sprocket 20.

Das zweite Zwischenrad 16 kämmt mit einem Antriebszahnrad 22 für eine nicht dargestellte Wasserpumpe. Das Kurbelwellenrad 12 kämmt ferner mit einem Antriebszahnrad 24 für eine nicht dargestellte Ölpumpe sowie mit einem dritten Zwischenrad 26. Das dritte Zwischenrad 26 kämmt wiederum mit einem vierten Zwischenrad 28, welches seinerseits ein Antriebszahnrad 30 eines nicht dargestellten Generators und ein Antriebszahnrad 32 einer nicht dargestellten Hydropumpe kämmend antreibt. Das zweite Zwischenrad 16 ist mit einem weiteren Zahnkranz 34 drehfest verbunden, wobei das zweite Zwischenrad 16 selbst mit dem ersten Zwischenrad 14 und der weitere Zahnkranz 34 mit dem Ausgleich-Zwischenrad 18 kämmt. Eine Zähnezahl des weiteren Zahnkranzes 34 und eine Zähnezahl des Ausgleich-Zwischenrades 18 ist dabei derart gewählt, daß sich vom Kurbelwellenrad 12 zum Nockenwellenrad 20 eine Übersetzung von 2:1 ergibt.The second intermediate gear 16 meshes with a drive gear 22 for a not shown Water pump. The crankshaft gear 12 further meshes with a drive gear 24 for a not shown oil pump and a third intermediate 26. The third intermediate 26 meshes again with a fourth intermediate 28, which in turn a Drive gear 30 of a generator, not shown, and a drive gear 32 a not shown hydropump drives combing. The second intermediate 16 is with a further sprocket 34 rotatably connected, wherein the second intermediate gear 16 itself with the first idler 14 and the other sprocket 34 with the balance idler 18th combs. A number of teeth of the other sprocket 34 and a number of teeth of the intermediate balance gear 18 is chosen such that the crankshaft 12 for Camshaft 20 gives a translation of 2: 1.

Eine Drehachse 36 des Ausgleich-Zwischenrades 18 ist bezüglich des Kurbelgehäuses 10 und eines Zylinderkopfes frei beweglich und wird lediglich bezüglich der Drehachsen 42, 44 von zweitem Zwischenrad 16 und Nockenwellenrad 20 durch zwei paar Bügel 38 und 40 vorbestimmt. Die Bügel 38 halten mit einer Seite die Drehachse 36 des Ausgleich-Zwischenrades 18 drehbar, während sich eine gegenüberliegende Seite der Bügel 38 an der Drehachse 42 des zweiten Zwischenrads 16 abstützt. Die Bügel 40 halten ebenfalls mit einer Seite die Drehachse 36 des Ausgleich-Zwischenrades 18 drehbar, während sich eine gegenüberliegende Seite der Bügel 38 im Zylinderkopfgehäuse über die Drehachse 44 des Nockenwellenrades 20 abstützt. An axis of rotation 36 of the compensating intermediate wheel 18 is relative to the crankcase 10 and a cylinder head freely movable and is only with respect to the axes of rotation 42, 44th from second idler gear 16 and camshaft gear 20 through two pair of brackets 38 and 40 predetermined. The bracket 38 hold with one side of the axis of rotation 36 of the intermediate balance gear 18 rotatable while an opposite side of the bracket 38 at the Rotary axis 42 of the second intermediate gear 16 is supported. The bracket 40 also hold with a Side the axis of rotation 36 of the balance intermediate wheel 18 rotatable while a opposite side of the bracket 38 in the cylinder head housing via the axis of rotation 44 of the Camshaft wheel 20 is supported.

Auf dieses Weise ist einerseits ein jeweiliger Abstand der Drehachse 36 zu den Drehachsen 42 und 44 festgelegt. Andererseits können die Bügel 38 und 40 bei sich veränderndem Abstand zwischen den Drehachsen 42 und 44 einen variierenden Winkel zueinander einschließen, so daß das Ausgleich-Zwischenrad 18 immer eng und im wesentlichen spielfrei sowohl mit dem Zahnkranz 34 als auch mit dem Nockenwellenrad 20 kämmt. Die Bügel 38 und 40 bilden somit ein Gelenk mit der Gelenkachse auf der Drehachse 36 des Ausgleich-Zwischenrades 18, welches sich entsprechend ändernden Abständen zwischen den Drehachsen 42 und 44 aufgrund von Wärmeausdehnung mehr oder weniger weit spreizt. Mittels Tellerfedern 46 wird dabei ein Taumeln des Ausgleich-Zwischenrades 18 verhindert.In this way, on the one hand, a respective distance of the axis of rotation 36 to the axes of rotation 42 and 44. On the other hand, the bracket 38 and 40 in changing Distance between the axes of rotation 42 and 44 at a varying angle to each other include so that the balance idler 18 always tight and substantially free of play meshes with both the ring gear 34 and the camshaft wheel 20. The bracket 38 and 40 thus form a hinge with the hinge axis on the axis of rotation 36 of the intermediate balance gear 18, which correspondingly changing distances between the Rotary axes 42 and 44 spreads more or less widely due to thermal expansion. By means of disc springs 46 while tumbling the balance intermediate wheel 18 is prevented.

Fig. 4 zeigt einen in Fig. 1 verdeckten Bereich des Stirnrad-Nockenwellenantriebs im Bereich des Nockenwellenrades 20. Das Bügelpaar 40 stützt sich im Zylinderkopfgehäuse über die Drehachse 44 des Nockenwellenrades 20 ab, wogegen jeweilige dem Nockenwellenrad 20 gegenüberliegende Enden 49 der Bügel 40 die Drehachse 36 des in Fig. 4 nicht dargestellten Ausgleich-Zwischenrades 18 halten. Mittels einer Schraube 48 und einer Hülse 50 wird die Nockenwellenanordnung verschraubt, welche ferner u.a. ein Geberrad 52 und eine Nabe 54 umfaßt.Fig. 4 shows a hidden in Fig. 1 region of the spur gear camshaft drive in the area The cam pair 40 is supported in the cylinder head housing over the Rotary axis 44 of the camshaft wheel 20 from, whereas respective the camshaft 20th opposite ends 49 of the bracket 40, the rotation axis 36 of the not shown in Fig. 4 Keep balancing idler 18. By means of a screw 48 and a sleeve 50 is the Camshaft assembly bolted, which further u.a. a donor wheel 52 and a hub 54 includes.

Claims (4)

  1. Spur-wheel camshaft drive for an internal combustion engine with a crankcase (10), with a crankshaft wheel (12) and with a camshaft wheel (20), characterized in that between the crankshaft wheel (12) and the camshaft wheel (20) is arranged at least one balancing intermediate wheel (18), the axis of rotation (36) of which is freely movable with respect to the crankcase (10).
  2. Spur-wheel camshaft drive according to Claim 1, characterized in that the axis of rotation (36) of the balancing intermediate wheel (18) is held pivotably by at least two shackles (38, 40) which are pivotably supported, at ends located opposite the axis of rotation (36) of the balancing intermediate wheel (18), in each case at fixed axes of rotation (42, 44) of gearwheels (20, 34) adjacent to the balancing intermediate wheel (18).
  3. Spur-wheel camshaft drive according to Claim 1 or 2, characterized in that the balancing intermediate wheel (18) is arranged between the camshaft wheel (20) and a last intermediate wheel (16) of the spur-wheel camshaft drive.
  4. Spur-wheel camshaft drive according to one of the preceding claims, characterized in that a ratio of the number of teeth between the balancing intermediate wheel (18) and an adjacent intermediate wheel (34) is selected such that a transmission ratio from crankshaft to camshaft of 2:1 is obtained.
EP99120961A 1998-11-20 1999-11-03 Externally toothed wheel drive for a cam shaft of an internal combustion engine Expired - Lifetime EP1002945B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853635A DE19853635A1 (en) 1998-11-20 1998-11-20 Spur gear camshaft drive for an internal combustion engine
DE19853635 1998-11-20

Publications (4)

Publication Number Publication Date
EP1002945A2 EP1002945A2 (en) 2000-05-24
EP1002945A4 EP1002945A4 (en) 2001-03-01
EP1002945A3 EP1002945A3 (en) 2001-04-18
EP1002945B1 true EP1002945B1 (en) 2005-02-09

Family

ID=7888490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99120961A Expired - Lifetime EP1002945B1 (en) 1998-11-20 1999-11-03 Externally toothed wheel drive for a cam shaft of an internal combustion engine

Country Status (3)

Country Link
EP (1) EP1002945B1 (en)
AT (1) ATE289006T1 (en)
DE (2) DE19853635A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004018263A1 (en) * 2004-04-15 2005-11-24 Bayerische Motoren Werke Ag Method for compensating for play in camshaft drive especially in IC engine has the camshaft drive wheel mounting close to the camshafts and with temperature compensation
DE102009027509A1 (en) 2009-07-07 2011-01-20 Zf Friedrichshafen Ag Gearwheel stages arrangement for use in gearbox, has axial distance changing devices arranged in area of one of shafts to change axial distances and exerting force on one of shafts towards one of sides of triangle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1148478A (en) * 1913-08-21 1915-07-27 J B M Electric Company Engine-gearing.
CS169211B1 (en) * 1974-01-24 1976-07-29
DE3309376C1 (en) * 1983-03-16 1984-11-08 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Camshaft drive of an internal combustion engine
JPH02146209A (en) * 1988-11-28 1990-06-05 Yamaha Motor Co Ltd Cam shaft driving device for four cycle engine
JPH04153506A (en) * 1990-10-17 1992-05-27 Mazda Motor Corp Cam shaft drive device for engine

Also Published As

Publication number Publication date
DE59911589D1 (en) 2005-03-17
EP1002945A3 (en) 2001-04-18
DE19853635A1 (en) 2000-05-25
ATE289006T1 (en) 2005-02-15
EP1002945A4 (en) 2001-03-01
EP1002945A2 (en) 2000-05-24

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