EP2674582A1 - Camshaft adjusting system - Google Patents

Camshaft adjusting system Download PDF

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Publication number
EP2674582A1
EP2674582A1 EP13169406.9A EP13169406A EP2674582A1 EP 2674582 A1 EP2674582 A1 EP 2674582A1 EP 13169406 A EP13169406 A EP 13169406A EP 2674582 A1 EP2674582 A1 EP 2674582A1
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EP
European Patent Office
Prior art keywords
shaft
connection region
camshaft adjusting
adjusting device
driver
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Granted
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EP13169406.9A
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German (de)
French (fr)
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EP2674582B1 (en
Inventor
Andreas Schüller
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Volkswagen AG
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Volkswagen AG
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    • 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
    • F01L1/344—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 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—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 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force

Definitions

  • the invention relates to a camshaft adjusting system with at least two camshafts, which are arranged in a shaft-in-shaft system.
  • a camshaft adjusting system for an internal combustion engine which comprises a camshaft actuator with a stator unit and a rotatably mounted in the stator unit rotor unit, wherein the rotor unit and the stator unit are positioned by a central screw to each other.
  • the described camshaft adjusting system further comprises a camshaft adapter for the axial connection of the camshaft adjuster to a camshaft.
  • the camshaft adapter is positively connected to the camshaft.
  • Out DE 199 51 390 A1 is a device for hydraulic rotation angle adjustment of a shaft relative to a drive wheel is known, in which a shaft side arranged plate with the drive wheel or a drive wheel side arranged component cooperates for the rotation angle adjustment. Also in this device, the adjustment via a hydraulically coupled to a stator rotor. In this device, segments or components which have the function of conventional wings of an impeller can be connected substantially axially.
  • the invention has for its object to provide a camshaft adjustment system with shaft-in-shaft system available, the manufacturing costs and space requirements are reduced.
  • a coupling means in particular, non-rotatable connections which have no or only a minor play and only include such tolerances and cause a substantially instantaneous synchronization even in dynamic operation.
  • a coupling in the sense of claim 1 are further understood such couplings, which allow a temporary relative movement between the first shaft and the second shaft due to their construction within a time-limited adjustment phase.
  • This type of coupling will be discussed in more detail below.
  • each axially extending coupling element such. axial entrainment, which engage in corresponding recesses in the first connection area and / or in the second connection area, axially extending, meshing teeth etc.
  • the camshaft adjusting device has the advantage that the space requirement is reduced insofar as required for a radial coupling Minimum width for a safe power transmission, especially by gears, is no longer required.
  • the camshaft adjusting device can therefore be made more compact. Also with regard to the production, there are advantages in that the axial coupling can be effected by axially pushing together the first connection region without additional work steps.
  • the first connection region and the second connection region can be coupled to one another particularly easily by axial collapse, when the first connection region, the second connection region and the driver are designed as an axial plug connection.
  • the manufacturing and assembly costs can be further reduced if the driver is integrally formed in the first connection region and / or in the second connection region. Because one or more drivers can be trained in many cases without or with only minor additional costs. Thus eliminates the formation of a much more expensive peripheral teeth.
  • the first connection region and / or the second connection region of a camshaft adjusting device according to the invention is driven by a radially acting drive, in particular a gear drive. Since many of the existing camshaft adjusting devices have such a gear drive, existing camshaft adjusting devices can be redesigned in this case with manageable design complexity to camshaft adjusting devices according to the invention.
  • camshaft adjusting devices in which a third shaft is arranged parallel to the first shaft and the second shaft.
  • the third shaft in this case may be, for example, a camshaft with intake valves and the first shaft and the second shaft camshafts for exhaust valves of an internal combustion engine.
  • an element of the drive in particular a gear, be mounted on the third shaft and thus produce a coupling between the third shaft and the first shaft and the second shaft.
  • the distance between the axis of rotation of the first and second shaft and the third shaft is often smaller than the sum of the radius R A of coupled to the first terminal area and second terminal area drive and the radius R S of the stator.
  • the advantages of the camshaft adjusting device according to the invention are particularly large, because in this geometric design of the design effort for a coupling over a peripheral teeth is particularly high. In particular, in this case, the cost of costly internal toothing in the first connection region or in the second connection region can be saved.
  • one or more axially outstanding bolts may be formed as drivers in the first connection region or in the second connection region, which engage in corresponding recesses formed in the second connection region or first connection region.
  • the bolts are preferably cylindrical or cuboid, since these embodiments are particularly inexpensive and robust.
  • the bolts may also have other suitable geometries.
  • a driver and axially intermeshing teeth may be formed in the first terminal region and in the second terminal region.
  • a toothing radially extending radially outwardly webs can be provided, for example, which are wider in the circumferential direction and thus approximately correspond to the shape of circle segments. By such teeth, the forces occurring during operation can be distributed over larger areas.
  • toothing in a broader sense, in each case one to ten circular segment-like projections and corresponding recesses are provided in the first connection region and in the second connection region.
  • an elastic element is arranged in the region of the driver in the case of a camshaft adjusting device according to the invention, it is possible to effect damping in the event of changes in rotational speed during dynamic operation of the camshaft adjusting device.
  • An elastic element is understood in particular to be springs or similar elements.
  • a spring element can, for example, be arranged in the region of the driver in such a way that the first connection region is prestressed in a direction of rotation relative to the second connection region.
  • a required for the assembly game is compensated by inserting the spring element between the pin and recesses before the start of the camshaft adjustment.
  • a spring element can also be used so that a spring travel exists in both directions of rotation. The spring element is then preferably selected so that the force occurring during operation are less than the force for the complete compression of the spring element, so that the spring travel is not exhausted in normal operation.
  • the drivers of a camshaft adjusting device may also have a conical cross-sectional shape, in particular such that the play increasingly reduces during the axial pushing together of the connection regions during assembly, until partial surfaces of the connection region come into play without play.
  • a play in the coupling can then alternatively be minimized or completely excluded.
  • the elements can also be positioned according to each other during assembly and fixed in this position.
  • FIG. 1 shows an embodiment of the camshaft adjusting device 10 according to the invention of an internal combustion engine, not shown in the figures for a motor vehicle with a first shaft 12 and a second shaft 14 which are arranged coaxially with each other.
  • the first shaft 12 is the outer shaft and the second shaft 14 is the inner shaft of a shaft-in-shaft system 16 known from camshaft adjusters.
  • the first shaft 12 and the second shaft 14 sit to the left of FIG FIG. 1 shown sections and are rotatably connected to a group of cams, not shown, which are used to control the associated exhaust valves of the internal combustion engine.
  • the first shaft 12 is supported by a sliding bearing 18 and other plain bearings, not shown.
  • the right end of the first shaft 12 has an enlarged diameter portion in which peripheral teeth 24 are formed.
  • the peripheral toothing 24 meshes with a circumferential toothing 30, which is formed on a gear 26 acting as a drive 28 and drives the first shaft.
  • the gear 28 is non-rotatably connected to a third shaft 32, which is also a camshaft and non-rotatably connected to the control of intake valves of the internal combustion engine serving cam (not shown).
  • the cams are located in the area which adjoins the shaft section shown on the left in the drawing.
  • a sliding bearing 34 and further, not shown plain bearings are provided for the storage of the third shaft 32.
  • the plain bearings 18, 34 and the plain bearings, not shown can be connected to each other via a common bearing frame (not shown).
  • the gear 22 further comprises an axially arranged toothing 36 in a first terminal portion 38 which is in engagement with a likewise formed axially on a stator 44 in a second terminal portion 42 axial toothing 40.
  • the intermeshing toothings 36, 40 are designed such that they effect a substantially rotationally fixed connection between the first connection region 38 connected in a rotationally fixed manner to the first shaft 12 and the second connection region 42 connected in a rotationally fixed manner to the stator 44. They are - regardless of their design - driver 20 in the context of the invention.
  • the stator 44 is hydraulically coupled to the rotor 46 surrounding it.
  • the rotor 46 itself, however, is rotatably coupled to the second shaft 14.
  • Rotor 46 and stator 44 are formed in a known manner so that their arrangement to each other with the aid of an impeller formed in the rotor 46 is hydraulically adjustable within certain limits, so as to vary the operation of the exhaust cam can.
  • FIG. 1 Area marked with x is the area in which space can be saved in the axial direction compared to the known from the prior art camshaft adjusting devices 10, because a circumferential toothing on the stator 44 is omitted.
  • FIGS. 2 to 4 show three different embodiments of drivers 20, which may be provided in camshaft adjusting devices 10 according to the invention.
  • connection regions 38, 42 As driver 20, nine circular segment-like projections 52 are alternately formed with circular segment-like recesses 54, wherein the two connection regions 38, 42 are designed to be complementary.
  • two circular segments of a quadrant as projections 52 are alternately formed with circular segments of a quadrant as depressions 54 in the connecting regions 38, 42, wherein the two connection regions 38, 42 are designed to be complementary.

Abstract

The camshaft adjustment device (10) has a shaft-in-shaft system (16) comprising two shafts (12,14) that are arranged coaxial to each other. A connection area (38) is arranged on the former shaft in a torque-proof manner, and another connection area (42) is arranged on a stator (44) in a torque-proof manner. An axially extending attachment (20) is arranged such that the two connection areas are coupled with each other. The two connection areas and the attachment are formed as an axial plug-in connection.

Description

Die Erfindung betrifft ein Nockenwellenverstellsystem mit mindestens zwei Nockenwellen, die in einem Welle-in-Welle-System angeordnet sind.The invention relates to a camshaft adjusting system with at least two camshafts, which are arranged in a shaft-in-shaft system.

Aus DE 10 2010 018 202 A1 ist ein Nockenwellenverstellsystem für eine Brennkraftmaschine bekannt, das einen Nockenwellensteller mit einer Statoreinheit und einer in der Statoreinheit drehbeweglich angeordneten Rotoreinheit umfasst, wobei die Rotoreinheit und die Statoreinheit durch eine Zentralschraube zueinander positioniert sind. Das beschriebene Nockenwellenverstellsystem umfasst ferner einen Nockenwellenadapter zur axialen Anbindung des Nockenwellenverstellers an eine Nockenwelle. Der Nockenwellenadapter ist formschlüssig mit der Nockenwelle verbunden.Out DE 10 2010 018 202 A1 a camshaft adjusting system for an internal combustion engine is known which comprises a camshaft actuator with a stator unit and a rotatably mounted in the stator unit rotor unit, wherein the rotor unit and the stator unit are positioned by a central screw to each other. The described camshaft adjusting system further comprises a camshaft adapter for the axial connection of the camshaft adjuster to a camshaft. The camshaft adapter is positively connected to the camshaft.

Aus DE 199 51 390 A1 ist eine Vorrichtung zur hydraulischen Drehwinkelverstellung einer Welle relativ zu einem Antriebsrad bekannt, bei welcher eine wellenseitig angeordnete Platte mit dem Antriebsrad oder einem antriebsradseitig angeordneten Bauteil zur Drehwinkelverstellung zusammenwirkt. Auch bei dieser Vorrichtung erfolgt die Verstellung über einen hydraulisch mit einem Stator gekoppelten Rotor. Bei dieser Vorrichtung können Segmente bzw. Bauteile, welche die Funktion herkömmlicher Flügel eines Flügelrades aufweisen, im Wesentlichen axial angebunden werden.Out DE 199 51 390 A1 is a device for hydraulic rotation angle adjustment of a shaft relative to a drive wheel is known, in which a shaft side arranged plate with the drive wheel or a drive wheel side arranged component cooperates for the rotation angle adjustment. Also in this device, the adjustment via a hydraulically coupled to a stator rotor. In this device, segments or components which have the function of conventional wings of an impeller can be connected substantially axially.

Aus US 6,176,210 B1 ist eine Vorrichtung zur hydraulischen Drehwinkelverstellung einer Kurbelwelle zu einer Nockenwelle bekannt, die einen Stator mit einer Vielzahl radial nach innen ragender Flügel, ein mit dem Stator an einer ersten Fläche verbundenes Stator-Antriebselement, einen speziell gestalteten Rotor mit ersten und zweiten sich axial erstreckenden Flächen und einen speziell gestalteten Lagerflansch umfasst.Out US 6,176,210 B1 For example, there is known an apparatus for hydraulically angularly adjusting a crankshaft to a camshaft comprising a stator having a plurality of radially inwardly projecting wings, a stator drive member connected to the stator on a first surface, a specially designed rotor having first and second axially extending surfaces and a specially designed bearing flange.

Aus DE 10 2010 024 198 A1 sind eine Reibscheibe zur Verbindung von Bauteilen in einem Nockenwellenverstellsystem und ein Nockenwellenverstellsystem mit Rotor und Stator bekannt. Die Reibscheibe weist einen im Wesentlichen ringförmigen Grundkörper mit wenigstens einer Reibfläche für einen Kontakt mit einem Reibpartner auf. Die Reibscheibe dient in dem beschriebenen Nockenwellenverstellsystem als axiale Anbindung zwischen Rotor und Nockenwelle und soll die Montage vereinfachen.Out DE 10 2010 024 198 A1 are known a friction disc for the connection of components in a camshaft adjusting system and a camshaft adjusting system with rotor and stator. The friction disc has a substantially annular base body with at least one friction surface for contact with a friction partner. The friction disc is used in the described camshaft adjusting system as an axial connection between the rotor and camshaft and is intended to simplify the assembly.

In den vorstehend genannten Druckschriften wird nicht explizit Bezug auf den Antrieb des Stators genommen. Bei einem aus der Praxis bekannten Nockenwellenverstellsystem, das ein Welle-in-Welle-System mit einer mit einem Rotor verbundenen Innenwelle und eine koaxial zu der Innenwelle angeordnete, mit einem Stator verbundene Außenwelle aufweist, erfolgt der Antrieb der Außenwelle und des Stators über ein breites Zahnrad, das mit einer auf der Außenwelle angeordneten Verzahnung und gleichzeitig mit einer an dem Stator ausgebildeten Verzahnung kämmt. Der relative Drehwinkel zwischen Innenwelle und Außenwelle kann bei diesem System in bekannter Art und Weise über den aus Rotor und Stator gebildeten hydraulischen Nockenwellenversteller erfolgen. Nachteilig an dem beschriebenen System ist der relativ hohe Bauraumbedarf durch die erforderliche Breite der Verzahnung sowie die mit der Verzahnung verbundenen Herstellungskosten.In the above references, reference is not explicitly made to the drive of the stator. In a camshaft adjusting system known from practice, which has a shaft-in-shaft system with an inner shaft connected to a rotor and an outer shaft arranged coaxially with the inner shaft, connected to a stator, the outer shaft and the stator are driven by a wide shaft Gear, which meshes with a toothing arranged on the outer shaft and at the same time with a toothing formed on the stator. The relative rotational angle between the inner shaft and outer shaft can be done in this system in a known manner via the hydraulic camshaft adjuster formed from the rotor and stator. A disadvantage of the described system is the relatively high space requirement due to the required width of the toothing and the production costs associated with the toothing.

Der Erfindung liegt die Aufgabe zugrunde, ein Nockenwellenverstellsystem mit Welle-in-Welle-System zur Verfügung zu stellen, dessen Herstellungskosten und Bauraumbedarf verringert sind.The invention has for its object to provide a camshaft adjustment system with shaft-in-shaft system available, the manufacturing costs and space requirements are reduced.

Die Lösung der Aufgabe erfolgt erfindungsgemäß mit den Merkmalen des Anspruchs 1.The object is achieved according to the invention with the features of claim 1.

Eine erfindungsgemäße Nockenwellenverstellvorrichtung für einen Verbrennungsmotor umfasst mindestens zwei Wellen, die Bestandteil eines Welle-in-Welle-System sind. Das Welle-in-Welle-System umfasst eine erste Welle und eine koaxial zu der ersten Welle angeordnete zweite Welle, wobei die erste Welle funktional mit einer ersten Gruppe von Nocken verbunden ist und wobei die zweite Welle funktional mit einer zweiten Gruppe von Nocken verbunden ist. Eine Phasenverstellung zwischen der ersten Welle und der zweiten Welle ist mittels eines Rotors und eines hydraulisch mit dem Rotor gekoppelten Stator vorgesehen. Die Vorrichtung umfasst ferner folgende Elemente:

  1. a) einen drehfest an der ersten Welle angeordneten ersten Anschlussbereich,
  2. b) einen drehfest an dem Stator angeordneten zweiten Anschlussbereich, wobei
  3. c) mindestens ein sich axial erstreckender Mitnehmer derart angeordnet ist, dass der erste Anschlussbereich und der zweite Anschlussbereich miteinander gekoppelt sind.
A camshaft adjusting device according to the invention for an internal combustion engine comprises at least two shafts forming part of a shaft-in-shaft system. The shaft-in-shaft system includes a first shaft and a second shaft coaxial with the first shaft, the first shaft being operatively connected to a first group of cams, and the second shaft being operatively connected to a second group of cams , A phase adjustment between the first shaft and the second shaft is provided by means of a rotor and a rotor hydraulically coupled to the rotor. The device further comprises the following elements:
  1. a) a first connection area arranged non-rotatably on the first shaft,
  2. b) a non-rotatably mounted on the stator second connection region, wherein
  3. c) at least one axially extending driver is arranged such that the first connection region and the second connection region are coupled together.

Unter einer Kopplung werden vorliegend insbesondere drehfeste Verbindungen verstanden, die kein oder ein nur geringeres Spiel aufweisen und lediglich solche Toleranzen umfassen und auch im dynamischen Betrieb einen im Wesentlichen verzögerungsfreien Gleichlauf bewirken. Als eine Kopplung im Sinne des Anspruchs 1 werden ferner solche Kopplungen verstanden, die aufgrund ihrer Konstruktion innerhalb einer zeitlich begrenzten Angleichungsphase eine temporäre Relativbewegung zwischen der ersten Welle und der zweiten Welle zulassen. Auf diese Art der Kopplung wird nachfolgend noch näher eingegangen. Als Mitnehmer im Sinne der Erfindung gilt jedes sich axial erstreckende Kopplungselement, wie z.B. axiale Mitnehmer, die in korrespondierende Ausnehmungen in den ersten Anschlussbereich und/oder in den zweiten Anschlussbereich eingreifen, sich axial erstreckende, ineinander eingreifende Verzahnungen etc. Die erfindungsgemäße Nockenwellenverstellvorrichtung hat den Vorteil, dass der Bauraumbedarf insofern verringert ist, als die bei einer radialen Kopplung erforderliche Mindestbreite für eine sichere Kraftübertragung, insbesondere durch Zahnräder, nicht mehr erforderlich ist. Die Nockenwellenverstellvorrichtung kann daher kompakter gestaltet werden. Auch in Bezug auf die Herstellung ergeben sich Vorteile dadurch, dass die axiale Kopplung durch axiales Zusammenschieben des ersten Anschlussbereiches ohne zusätzliche Arbeitsschritte erfolgen kann.In the present case, a coupling means, in particular, non-rotatable connections which have no or only a minor play and only include such tolerances and cause a substantially instantaneous synchronization even in dynamic operation. As a coupling in the sense of claim 1 are further understood such couplings, which allow a temporary relative movement between the first shaft and the second shaft due to their construction within a time-limited adjustment phase. This type of coupling will be discussed in more detail below. As a driver in the context of the invention, each axially extending coupling element, such. axial entrainment, which engage in corresponding recesses in the first connection area and / or in the second connection area, axially extending, meshing teeth etc. The camshaft adjusting device according to the invention has the advantage that the space requirement is reduced insofar as required for a radial coupling Minimum width for a safe power transmission, especially by gears, is no longer required. The camshaft adjusting device can therefore be made more compact. Also with regard to the production, there are advantages in that the axial coupling can be effected by axially pushing together the first connection region without additional work steps.

Der erste Anschlussbereich und der zweite Anschlussbereich lassen sich besonders einfach durch axiales Zusammenschieben miteinander koppeln, wenn der erste Anschlussbereich, der zweite Anschlussbereich und der Mitnehmer als axiale Steckverbindung ausgebildet sind.The first connection region and the second connection region can be coupled to one another particularly easily by axial collapse, when the first connection region, the second connection region and the driver are designed as an axial plug connection.

Die Herstellungs- und Montagekosten können weiter reduziert werden, wenn der Mitnehmer einstückig in dem ersten Anschlussbereich und/oder in dem zweiten Anschlussbereich ausgebildet ist. Denn ein oder mehrere Mitnehmer lassen sich in vielen Fällen ohne oder mit nur geringen Zusatzkosten ausbilden. Somit entfällt die Ausbildung einer wesentlich kostenintensiveren Umfangsverzahnung.The manufacturing and assembly costs can be further reduced if the driver is integrally formed in the first connection region and / or in the second connection region. Because one or more drivers can be trained in many cases without or with only minor additional costs. Thus eliminates the formation of a much more expensive peripheral teeth.

Vorzugsweise ist der erste Anschlussbereich und/oder der zweite Anschlussbereich einer erfindungsgemäßen Nockenwellenverstellvorrichtung von einem radial angreifenden Antrieb, insbesondere einem Zahnradantrieb, angetrieben. Da viele der existierenden Nockenwellenverstellvorrichtungen einen derartigen Zahnradantrieb aufweisen, lassen sich existierende Nockenwellenverstellvorrichtungen in diesem Fall mit überschaubarem konstruktiven Aufwand zu erfindungsgemäßen Nockenwellenverstellvorrichtungen umkonstruieren.Preferably, the first connection region and / or the second connection region of a camshaft adjusting device according to the invention is driven by a radially acting drive, in particular a gear drive. Since many of the existing camshaft adjusting devices have such a gear drive, existing camshaft adjusting devices can be redesigned in this case with manageable design complexity to camshaft adjusting devices according to the invention.

Das Vorstehende gilt ebenfalls für Nockenwellenverstellvorrichtungen, bei denen eine dritte Welle parallel zu der ersten Welle und der zweiten Welle angeordnet ist. Die dritte Welle kann in diesem Fall beispielsweise eine Nockenwelle mit Einlassventilen und die erste Welle und die zweite Welle Nockenwellen für Auslassventile eines Verbrennungsmotors sein. In diesem Fall kann ein Element des Antriebs, insbesondere ein Zahnrad, auf der dritten Welle gelagert sein und somit eine Kopplung zwischen der dritten Welle und der ersten Welle bzw. der zweiten Welle herstellen.The foregoing also applies to camshaft adjusting devices in which a third shaft is arranged parallel to the first shaft and the second shaft. The third shaft in this case may be, for example, a camshaft with intake valves and the first shaft and the second shaft camshafts for exhaust valves of an internal combustion engine. In this case, an element of the drive, in particular a gear, be mounted on the third shaft and thus produce a coupling between the third shaft and the first shaft and the second shaft.

Bei bekannten Nockenwellenverstellvorrichtungen ist der Abstand zwischen der Drehachse der ersten bzw. zweiten Welle und der dritten Welle häufig kleiner als die Summe aus dem Radius RA des mit dem ersten Anschlussbereiches bzw. zweiten Anschlussbereiches gekoppelten Antriebs und dem Radius RS des Stators. In diesen Fällen sind die Vorteile der erfindungsgemäßen Nockenwellenverstellvorrichtung besonders groß, weil in dieser geometrischen Gestaltungsform der konstruktive Aufwand für eine Kopplung über eine Umfangsverzahnung besonders hoch ist. Insbesondere können in diesem Fall die Kosten einer kostenintensiven Innenverzahnung in dem ersten Anschlussbereich oder in dem zweiten Anschlussbereich eingespart werden.In known camshaft adjusting devices, the distance between the axis of rotation of the first and second shaft and the third shaft is often smaller than the sum of the radius R A of coupled to the first terminal area and second terminal area drive and the radius R S of the stator. In these cases, the advantages of the camshaft adjusting device according to the invention are particularly large, because in this geometric design of the design effort for a coupling over a peripheral teeth is particularly high. In particular, in this case, the cost of costly internal toothing in the first connection region or in the second connection region can be saved.

Wie bereits beispielhaft erwähnt, können als Mitnehmer in dem ersten Anschlussbereich oder in dem zweiten Anschlussbereich ein oder mehrere axial hervorragende Bolzen ausgebildet sein, die in korrespondierende, in dem zweiten Anschlussbereich bzw. ersten Anschlussbereich ausgebildete Ausnehmungen eingreifen. Die Bolzen sind vorzugsweise zylindrisch oder quaderförmig gestaltet, da diese Ausführungsformen besonders kostengünstig und robust sind. Die Bolzen können jedoch auch andere geeignete Geometrien aufweisen.As already mentioned by way of example, one or more axially outstanding bolts may be formed as drivers in the first connection region or in the second connection region, which engage in corresponding recesses formed in the second connection region or first connection region. The bolts are preferably cylindrical or cuboid, since these embodiments are particularly inexpensive and robust. However, the bolts may also have other suitable geometries.

Als Mitnehmer können auch axial ineinander eingreifende Verzahnungen in dem ersten Anschlussbereich und in dem zweiten Anschlussbereich ausgebildet sein. Als Verzahnung können beispielsweise strahlenförmig radial nach außen verlaufende Stege vorgesehen sein, die in Umfangsrichtung breiter werden und somit annähernd der Form von Kreissegmenten entsprechen. Durch derartige Verzahnungen können die beim Betrieb auftretenden Kräfte auf größere Flächen verteilt werden.As a driver and axially intermeshing teeth may be formed in the first terminal region and in the second terminal region. As a toothing radially extending radially outwardly webs can be provided, for example, which are wider in the circumferential direction and thus approximately correspond to the shape of circle segments. By such teeth, the forces occurring during operation can be distributed over larger areas.

Bei einer besonders robusten Ausführungsform sind als Verzahnung im weiteren Sinne in dem ersten Anschlussbereich und in dem zweiten Anschlussbereich wechselweise jeweils ein bis zehn kreissegmentartige Vorsprünge und korrespondierende Ausnehmungen vorgesehen. Wenn bei einer erfindungsgemäßen Nockenwellenverstellvorrichtung im Bereich des Mitnehmers ein elastisches Element angeordnet ist, kann im dynamischen Betrieb der Nockenwellenverstellvorrichtung eine Dämpfung bei Drehzahländerungen bewirkt werden. Unter einem elastischen Element werden insbesondere Federn oder ähnlich wirkende Elemente verstanden. Ein Federelement kann beispielsweise so im Bereich des Mitnehmers angeordnet werden, dass der erste Anschlussbereich relativ zu dem zweiten Anschlussbereich in einer Drehrichtung vorgespannt wird. In diesem Fall wird ein für die Montage erforderliches Spiel durch Einsetzen des Federelements zwischen Bolzen und Ausnehmungen bereits vor der Inbetriebnahme der Nockenwellenverstellvorrichtung ausgeglichen. Ein Federelement kann auch so eingesetzt werden, dass in beide Drehrichtungen ein Federweg existiert. Das Federelement wird dann vorzugsweise so ausgewählt, dass die im Betrieb auftretende Kraft geringer sind als die Kraft für die vollständige Kompression des Federelements, so dass der Federweg im Regelbetrieb nicht ausgeschöpft wird.In a particularly robust embodiment, as toothing in a broader sense, in each case one to ten circular segment-like projections and corresponding recesses are provided in the first connection region and in the second connection region. If an elastic element is arranged in the region of the driver in the case of a camshaft adjusting device according to the invention, it is possible to effect damping in the event of changes in rotational speed during dynamic operation of the camshaft adjusting device. An elastic element is understood in particular to be springs or similar elements. A spring element can, for example, be arranged in the region of the driver in such a way that the first connection region is prestressed in a direction of rotation relative to the second connection region. In this case, a required for the assembly game is compensated by inserting the spring element between the pin and recesses before the start of the camshaft adjustment. A spring element can also be used so that a spring travel exists in both directions of rotation. The spring element is then preferably selected so that the force occurring during operation are less than the force for the complete compression of the spring element, so that the spring travel is not exhausted in normal operation.

Die Mitnehmer einer erfindungsgemäßen Nockenwellenverstellvorrichtung können auch eine konische Querschnittsform aufweisen, insbesondere derart, dass sich beim axialen Zusammenschieben der Anschlussbereiche während der Montage das Spiel zunehmend verringert, bis Teilflächen der Anschlussbereich spielfrei zur Anlage kommen. Durch eine axiale Verspannung des ersten Anschlussbereiches zu dem zweiten Anschlussbereich kann ein Spiel in der Kopplung dann alternativ minimiert bzw. vollständig ausgeschlossen werden. Anstelle einer Verspannung können die Elemente während der Montage auch entsprechend zueinander positioniert und in dieser Lage fixiert werden.The drivers of a camshaft adjusting device according to the invention may also have a conical cross-sectional shape, in particular such that the play increasingly reduces during the axial pushing together of the connection regions during assembly, until partial surfaces of the connection region come into play without play. By axial clamping of the first connection region to the second connection region, a play in the coupling can then alternatively be minimized or completely excluded. Instead of a tension, the elements can also be positioned according to each other during assembly and fixed in this position.

Weitere praktische Ausführungsformen und Vorteile der Erfindung sind nachfolgend im Zusammenhang mit den Zeichnungen beschrieben. Es zeigen:

Fig. 1
eine schematische Darstellung einer Ausführungsform der erfindungsgemäßen Nockenwellenverstellvorrichtung,
Fig. 2
eine erste Gestaltungsvariante von Mitnehmern,
Fig. 3
eine zweite Gestaltungsvariante von Mitnehmer und
Fig. 4
eine dritte Gestaltungsvariante von Mitnehmern.
Further practical embodiments and advantages of the invention are described below in conjunction with the drawings. Show it:
Fig. 1
a schematic representation of an embodiment of the camshaft adjusting device according to the invention,
Fig. 2
a first design variant of drivers,
Fig. 3
a second design variant of driver and
Fig. 4
a third design variant of drivers.

Figur 1 zeigt eine Ausführungsform der erfindungsgemäßen Nockenwellenverstellvorrichtung 10 eines in den Figuren nicht dargestellten Verbrennungsmotors für ein Kraftfahrzeug mit einer ersten Welle 12 und einer zweiten Welle 14, die koaxial zueinander angeordnet sind. Die erste Welle 12 ist die Außenwelle und die zweite Welle 14 ist die Innenwelle eines von Nockenwellenverstellvorrichtungen bekannten Welle-in-Welle-Systems 16. Die erste Welle 12 und die zweite Welle 14 setzen sich links der in Figur 1 dargestellten Abschnitte fort und sind drehfest mit einer nicht dargestellten Gruppe von Nocken verbunden, die der Steuerung von zugeordneten Auslassventilen des Verbrennungsmotors dienen. Die erste Welle 12 ist durch ein Gleitlager 18 und weitere, nicht dargestellte Gleitlager gelagert. FIG. 1 shows an embodiment of the camshaft adjusting device 10 according to the invention of an internal combustion engine, not shown in the figures for a motor vehicle with a first shaft 12 and a second shaft 14 which are arranged coaxially with each other. The first shaft 12 is the outer shaft and the second shaft 14 is the inner shaft of a shaft-in-shaft system 16 known from camshaft adjusters. The first shaft 12 and the second shaft 14 sit to the left of FIG FIG. 1 shown sections and are rotatably connected to a group of cams, not shown, which are used to control the associated exhaust valves of the internal combustion engine. The first shaft 12 is supported by a sliding bearing 18 and other plain bearings, not shown.

Das rechte Ende der ersten Welle 12 weist einen Bereich mit vergrößertem Durchmesser auf, in welchem eine Umfangsverzahnung 24 ausgebildet ist. Die Umfangsverzahnung 24 kämmt mit einer Umfangsverzahnung 30, die an einem als Antrieb 26 fungierenden Zahnrad 28 ausgebildet ist und die erste Welle antreibt. Das Zahnrad 28 ist drehfest mit einer dritten Welle 32 verbunden, die ebenfalls eine Nockenwelle ist und drehfest mit der Steuerung von Einlassventilen des Verbrennungsmotors dienenden Nocken (nicht dargestellt) verbunden ist. Die Nocken befinden sich in dem Bereich, der sich links an den in der Zeichnung dargestellten Wellenabschnitt anschließt. Für die Lagerung der dritten Welle 32 sind ein Gleitlager 34 und weitere, nicht dargestellte Gleitlager vorgesehen. Die Gleitlager 18, 34 sowie die nicht dargestellten Gleitlager können über einen gemeinsamen Lagerrahmen (nicht dargestellt) miteinander verbunden sein.The right end of the first shaft 12 has an enlarged diameter portion in which peripheral teeth 24 are formed. The peripheral toothing 24 meshes with a circumferential toothing 30, which is formed on a gear 26 acting as a drive 28 and drives the first shaft. The gear 28 is non-rotatably connected to a third shaft 32, which is also a camshaft and non-rotatably connected to the control of intake valves of the internal combustion engine serving cam (not shown). The cams are located in the area which adjoins the shaft section shown on the left in the drawing. For the storage of the third shaft 32, a sliding bearing 34 and further, not shown plain bearings are provided. The plain bearings 18, 34 and the plain bearings, not shown, can be connected to each other via a common bearing frame (not shown).

Wie in Figur 1 zu erkennen ist, ist an der rechten Seite des Zahnrads 22 ferner eine axial angeordnete Verzahnung 36 in einem ersten Anschlussbereich 38 ausgebildet, die mit einer ebenfalls axial an einem Stator 44 in einem zweiten Anschlussbereich 42 ausgebildeten axialen Verzahnung 40 in Eingriff steht. Die kämmenden Verzahnungen 36, 40 sind so ausgebildet, dass sie eine im Wesentlichen drehfeste Verbindung zwischen dem mit der ersten Welle 12 drehfest verbundenen ersten Anschlussbereich 38 und dem mit dem Stator 44 drehfest verbundenen zweiten Anschlussbereich 42 bewirken. Sie sind - unabhängig von deren Ausgestaltung - Mitnehmer 20 im Sinne der Erfindung.As in FIG. 1 can be seen, on the right side of the gear 22 further comprises an axially arranged toothing 36 in a first terminal portion 38 which is in engagement with a likewise formed axially on a stator 44 in a second terminal portion 42 axial toothing 40. The intermeshing toothings 36, 40 are designed such that they effect a substantially rotationally fixed connection between the first connection region 38 connected in a rotationally fixed manner to the first shaft 12 and the second connection region 42 connected in a rotationally fixed manner to the stator 44. They are - regardless of their design - driver 20 in the context of the invention.

Der Stator 44 ist hydraulisch mit dem von diesem umschließenden Rotor 46 gekoppelt. Der Rotor 46 selbst hingegen ist drehfest mit der zweiten Welle 14 gekoppelt. Rotor 46 und Stator 44 sind in bekannter Weise so ausgebildet, dass deren Anordnung zueinander mit Hilfe eines in dem Rotor 46 ausgebildeten Flügelrades innerhalb gewisser Grenzen hydraulisch verstellbar ist, um so die Betätigung der Auslassnocken variieren zu können.The stator 44 is hydraulically coupled to the rotor 46 surrounding it. The rotor 46 itself, however, is rotatably coupled to the second shaft 14. Rotor 46 and stator 44 are formed in a known manner so that their arrangement to each other with the aid of an impeller formed in the rotor 46 is hydraulically adjustable within certain limits, so as to vary the operation of the exhaust cam can.

Der in Figur 1 mit x gekennzeichnete Bereich ist derjenige Bereich, in welchem im Vergleich zu den aus dem Stand der Technik bekannten Nockenwellenverstellvorrichtungen 10 in axialer Richtung Bauraum eingespart werden kann, weil eine Umfangsverzahnung an dem Stator 44 entfällt.The in FIG. 1 Area marked with x is the area in which space can be saved in the axial direction compared to the known from the prior art camshaft adjusting devices 10, because a circumferential toothing on the stator 44 is omitted.

Die Figuren 2 bis 4 zeigen drei verschiedene Ausführungsformen von Mitnehmern 20, die bei erfindungsgemäßen Nockenwellenverstellvorrichtungen 10 vorgesehen sein können.The FIGS. 2 to 4 show three different embodiments of drivers 20, which may be provided in camshaft adjusting devices 10 according to the invention.

In der in Figur 2 gezeigten Ausführungsform sind im ersten Anschlussbereich 38 als Mitnehmer 20 vier axial hervorragende zylindrische Bolzen 48 vorgesehen, die beim axialen Zusammenschieben mit dem zweiten Anschlussbereich 42 des Stators 44 (vgl. Figur 1) in korrespondierende Ausnehmungen 50 eingreifen.In the in FIG. 2 In the embodiment shown, in the first connection region 38, four axially outstanding cylindrical bolts 48 are provided as drivers 20, which are axially coupled to the second connection region 42 of the stator 44 (cf. FIG. 1 ) engage in corresponding recesses 50.

In der in Figur 3 gezeigten Ausführungsform sind in den Anschlussbereichen 38, 42 als Mitnehmer 20 neun kreissegmentartige Vorsprünge 52 wechselweise mit kreissegmentartigen Vertiefungen 54 ausgebildet, wobei die beiden Anschlussbereiche 38, 42 komplementär ausgebildet sind.In the in FIG. 3 In the connection regions 38, 42, as driver 20, nine circular segment-like projections 52 are alternately formed with circular segment-like recesses 54, wherein the two connection regions 38, 42 are designed to be complementary.

In der in Figur 4 gezeigten Ausführungsform sind in den Anschlussbereichen 38, 42 als Mitnehmer 20 zwei Kreissegmente eines Viertelkreises als Vorsprünge 52 wechselweise mit Kreissegmenten eines Viertelkreises als Vertiefungen 54 ausgebildet, wobei die beiden Anschlussbereiche 38, 42 komplementär ausgebildet sind.In the in FIG. 4 1, two circular segments of a quadrant as projections 52 are alternately formed with circular segments of a quadrant as depressions 54 in the connecting regions 38, 42, wherein the two connection regions 38, 42 are designed to be complementary.

Die Erfindung ist nicht auf die vorstehend beschriebenen Ausführungsbeispiele beschränkt. Der zuständige Fachmann kann im Rahmen der Ansprüche und im Rahmen seines Fachwissens abweichende Ausführungsformen kreieren.The invention is not limited to the embodiments described above. The person skilled in the art can create deviating embodiments within the scope of the claims and within the scope of his specialist knowledge.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
NockenwellenverstellvorrichtungCamshaft adjusting device
1212
erste Wellefirst wave
1414
zweite Wellesecond wave
1616
Welle-in-Welle-SystemShaft-in-wave system
1818
Gleitlagerbearings
2020
Mitnehmertakeaway
2222
Zahnradgear
2424
Umfangsverzahnungsplines
2626
Antriebdrive
2828
Zahnradgear
3030
Umfangsverzahnungsplines
3232
dritte Wellethird wave
3434
Gleitlagerbearings
3636
axiale Verzahnungaxial toothing
3838
erster Anschlussbereichfirst connection area
4040
axiale Verzahnungaxial toothing
4242
zweiter Anschlussbereichsecond connection area
4444
Statorstator
4646
Rotorrotor
4848
Bolzenbolt
5050
Ausnehmungrecess
5252
Vorsprunghead Start
5454
Vertiefungdeepening

Claims (10)

Nockenwellenverstellvorrichtung für einen Verbrennungsmotor mit einem Welle-in-Welle-System (16), wobei das Welle-in-Welle-System (16) eine erste Welle (12) und eine koaxial zu der ersten Welle (12) angeordnete zweite Welle (14) umfasst, wobei die erste Welle (12) funktional mit einer ersten Gruppe von Nocken verbunden ist, wobei die zweite Welle (14) funktional mit einer zweiten Gruppe von Nocken verbunden ist, wobei eine Phasenverstellung zwischen der ersten Welle (12) und der zweiten Welle (14) mittels eines Rotors (46) und eines hydraulisch mit dem Rotor (46) gekoppelten Stator (44) vorgesehen ist und wobei die Vorrichtung ferner folgende Elemente umfasst: a) einen drehfest an der ersten Welle (12) angeordneten ersten Anschlussbereich (38) b) einen drehfest an dem Stator (44) angeordneten zweiten Anschlussbereich (42), dadurch gekennzeichnet, dass c) mindestens ein sich axial erstreckender Mitnehmer (20) derart angeordnet ist, dass der erste Anschlussbereich (38) und der zweite Anschlussbereich (42) miteinander gekoppelt sind. Camshaft adjusting device for an internal combustion engine with a shaft-in-shaft system (16), wherein the shaft-in-shaft system (16) comprises a first shaft (12) and a second shaft (14) arranged coaxially with the first shaft (12) ), wherein the first shaft (12) is operatively connected to a first group of cams, the second shaft (14) being operatively connected to a second group of cams, wherein a phasing between the first shaft (12) and the second one Shaft (14) by means of a rotor (46) and a hydraulically coupled to the rotor (46) stator (44) is provided and wherein the device further comprises the following elements: a) a first connection region (38) arranged non-rotatably on the first shaft (12) b) a rotatably on the stator (44) arranged second connection region (42), characterized in that c) at least one axially extending driver (20) is arranged such that the first connection region (38) and the second connection region (42) are coupled together. Nockenwellenverstellvorrichtung nach dem vorstehenden Anspruch, dadurch gekennzeichnet, dass der erste Anschlussbereich (38), der zweite Anschlussbereich (42) und der Mitnehmer (20) als axiale Steckverbindung ausgebildet sind.Camshaft adjusting device according to the preceding claim, characterized in that the first connection region (38), the second connection region (42) and the driver (20) are formed as an axial plug connection. Nockenwellenverstellvorrichtung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Mitnehmer (20) einstückig in dem ersten Anschlussbereich (38) und/oder in dem zweiten Anschlussbereich (42) ausgebildet ist.Camshaft adjusting device according to one or more of the preceding claims, characterized in that the driver (20) is integrally formed in the first connection region (38) and / or in the second connection region (42). Nockenwellenverstellvorrichtung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der erste Anschlussbereich (38) oder der zweite Anschlussbereich (42) von einem radial angreifenden Antrieb (26) angetrieben ist.Camshaft adjusting device according to one or more of the preceding claims, characterized in that the first connection region (38) or the second connection region (42) is driven by a radially acting drive (26). Nockenwellenverstellvorrichtung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass eine dritte Welle (32) parallel zu der ersten Welle (12) und der zweiten Welle (14) angeordnet ist, wobei ein Element des Antriebs (26) auf der dritten Welle (32) gelagert ist.Camshaft adjusting device according to one or more of the preceding claims, characterized in that a third shaft (32) is arranged parallel to the first shaft (12) and the second shaft (14), wherein an element of the drive (26) on the third shaft ( 32) is stored. Nockenwellenverstellvorrichtung nach einem oder mehreren der beiden vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Abstand zwischen der Drehachse der ersten bzw. zweiten Welle (12, 14) und der dritten Welle (32) kleiner ist, als die Summe aus dem Radius RA des mit dem ersten Anschlussbereich (38) bzw. zweiten Anschlussbereich (42) gekoppelten Antriebs (26) und dem Radius RS des Stators (44).Camshaft adjusting device according to one or more of the two preceding claims, characterized in that the distance between the axis of rotation of the first and second shaft (12, 14) and the third shaft (32) is smaller than the sum of the radius R A of the the drive (26) coupled to the first connection region (38) or second connection region (42) and the radius R S of the stator (44). Nockenwellenverstellvorrichtung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass als Mitnehmer (20) in dem ersten Anschlussbereich (38) oder in dem zweiten Anschlussbereich (42) ein axial hervorragender Bolzen (48) ausgebildet ist, der in eine korrespondierende, in dem zweiten Anschlussbereich (42) bzw. in dem ersten Anschlussbereich (38) ausgebildete Ausnehmung (50) eingreift.Camshaft adjusting device according to one or more of the preceding claims, characterized in that as the driver (20) in the first connection region (38) or in the second connection region (42) an axially outstanding pin (48) is formed, which in a corresponding, in the second connection region (42) or in the first connection region (38) formed recess (50) engages. Nockenwellenverstellvorrichtung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass als Mitnehmer (20) axial ineinander eingreifende Verzahnungen (40) in dem ersten Anschlussbereich (38) und in dem zweiten Anschlussbereich 42 ausgebildet sind.Camshaft adjusting device according to one or more of the preceding claims, characterized in that as a driver (20) axially intermeshing teeth (40) in the first connection region (38) and in the second connection region 42 are formed. Nockenwellenverstellvorrichtung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass im Bereich des Mitnehmers (20) ein elastisches Element angeordnet ist.Camshaft adjusting device according to one or more of the preceding claims, characterized in that an elastic element is arranged in the region of the driver (20). Nockenwellenverstellvorrichtung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Mitnehmer (20) eine konische Querschnittsform aufweisen und der erste Anschlussbereich (38) und der zweite Anschlussbereich (42) axial zueinander verspannt sind.Camshaft adjusting device according to one or more of the preceding claims, characterized in that the drivers (20) have a conical cross-sectional shape and the first connection region (38) and the second connection region (42) are clamped axially to each other.
EP13169406.9A 2012-06-14 2013-05-28 Camshaft adjusting system Active EP2674582B1 (en)

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US20050226736A1 (en) * 2004-04-13 2005-10-13 Lancefield Timothy M Variable phase drive mechanism
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EP2415979A1 (en) * 2010-08-04 2012-02-08 Hydraulik-Ring GmbH Camshaft phaser

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Publication number Priority date Publication date Assignee Title
US6176210B1 (en) 1999-09-14 2001-01-23 Delphi Technologies, Inc. Axially-compact cam phaser having an inverted bearing
DE19951390A1 (en) 1999-10-26 2001-05-03 Schaeffler Waelzlager Ohg Device for the hydraulic rotation angle adjustment of a shaft relative to a drive wheel
US20050226736A1 (en) * 2004-04-13 2005-10-13 Lancefield Timothy M Variable phase drive mechanism
GB2433974A (en) * 2006-01-04 2007-07-11 Mechadyne Plc Mounting of a SCP (single cam phaser) camshaft on an engine
GB2444943A (en) * 2006-12-19 2008-06-25 Mechadyne Plc Camshaft and phaser assembly
DE102008033230A1 (en) * 2008-01-04 2009-07-09 Hydraulik-Ring Gmbh Double camshaft adjuster in layer construction
DE102009041873A1 (en) * 2008-10-09 2010-04-15 Schaeffler Kg Camshaft adjuster for the inner camshaft of a concentric camshaft assembly
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EP2415979A1 (en) * 2010-08-04 2012-02-08 Hydraulik-Ring GmbH Camshaft phaser

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