EP0903470A1 - Device for variable camshaft timing in an internal combustion engine - Google Patents

Device for variable camshaft timing in an internal combustion engine Download PDF

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Publication number
EP0903470A1
EP0903470A1 EP98890261A EP98890261A EP0903470A1 EP 0903470 A1 EP0903470 A1 EP 0903470A1 EP 98890261 A EP98890261 A EP 98890261A EP 98890261 A EP98890261 A EP 98890261A EP 0903470 A1 EP0903470 A1 EP 0903470A1
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EP
European Patent Office
Prior art keywords
camshaft
threaded section
drive wheel
adjusting element
component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98890261A
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German (de)
French (fr)
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EP0903470B1 (en
Inventor
Siegfried Ing. Heer
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TCG Unitech AG
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TCG Unitech AG
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Publication date
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Priority to AT98890261T priority Critical patent/ATE249573T1/en
Publication of EP0903470A1 publication Critical patent/EP0903470A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—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
    • F01L1/352—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 bevel or epicyclic gear
    • 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
    • F01L1/34403—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 helically teethed sleeve or gear moving axially between crankshaft and camshaft
    • F01L1/34406—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 helically teethed sleeve or gear moving axially between crankshaft and camshaft the helically teethed sleeve being located in the camshaft driving pulley
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/032—Electric motors

Definitions

  • the present invention relates to a device for adjusting a camshaft Internal combustion engine with respect to the drive wheel driving it, with an adjusting element that engages on the one hand with a component carrying the drive wheel stands, and on the other hand with a component firmly connected to the camshaft in Engagement is, with an axial displacement of the adjusting element a rotation of the Camshaft can be effected relative to the drive wheel, as well as with an electric motor Displacement of the adjusting element in the axial direction, which is firmly connected to the camshaft and is supplied with power via sliding contacts.
  • the camshaft of an internal combustion engine is usually driven by a sprocket is connected to the crankshaft via a drive chain, or one designed as a pulley Drive wheel, which is connected to the crankshaft via a toothed belt, driven.
  • GB 2 221 513 A shows an adjusting device for camshafts, in which an electric motor operates a group of levers that rotate the camshaft relative to the drive wheel.
  • an actuating element on which the levers are articulated, in Axial direction shifted.
  • Adjustment devices are known from DE 41 10 088 C1 and from DE 39 29 619 A1, where between a component connected to the camshaft and a an adjusting element is provided with the drive wheel in connection with the component has two helical gears with the corresponding gears of the camshaft or the drive wheel are engaged.
  • This adjustment element can cause the camshaft to rotate relative to the drive wheel become.
  • One possibility of the axial displacement of the adjusting element is actuation by a hydraulic piston, which depends on the required adjustment is operated.
  • the disadvantage of this solution is that to achieve the required forces relatively large hydraulic piston is required, which is a great deal of construction represents.
  • the oil consumption by the operation of the piston is relatively large, what represents a load on the engine by an appropriate oil pump.
  • the camshaft only between two end positions be switched back and forth.
  • an electrical adjustment device is known from DE 41 01 676 A1, in which a Electric motor is provided, which moves the adjusting element via a threaded spindle.
  • a Electric motor is provided, which moves the adjusting element via a threaded spindle.
  • the adjusting element rotates essentially at the camshaft speed, it must an axial thrust bearing can be provided between the electric motor and the adjusting element, that absorbs the relative movement between the torsion-resistant and the rotating component.
  • This thrust bearing is in the known solution practically throughout Engine operation is loaded because of the torsional moments acting between the drive wheel and the camshaft always exerted a force acting in the axial direction on the adjusting element becomes. This thrust bearing is therefore a critical part of the life of the engine restricted.
  • a similar solution is described in DE 33 20 835 A1, the same Disadvantages occur.
  • the object of the present invention is to provide a device of the type mentioned above to further develop that with comparatively simple means a safe and reliable adjustment the camshaft is reached without restricting the life of the engine.
  • the adjusting element has a first Threaded section which is connected to a threaded section of which is firmly connected to the camshaft Component is engaged as well as a second threaded section that with a threaded section of the component carrying the drive wheel is engaged.
  • the electric motor is fundamentally compatible with the Camshaft rotates and that due to the large reduction that the two Given threaded sections, a relatively low torque load on the electric motor is achievable. In this way, a complex transmission of the actuating force can be achieved avoided by a non-rotating electric motor on the rotating camshaft become.
  • the system of the invention is self-locking, so that an undesirable adjustment of the System cannot take place. Furthermore, the system does not require any rolling bearings that control the speed the camshaft.
  • the rolling bearings of the system run as a whole with camshaft speed and only have to absorb the rotation of the electric motor.
  • the camshaft is connected to a flange that the electric motor with a sleeve-shaped component is connected and that the flange via connecting elements through the drive wheel pass through, is firmly connected to the sleeve-shaped component.
  • bolts enter the flange with the sleeve connect through arcuate slots in the drive wheel.
  • the electric motor is firmly connected to the drive wheel and is supplied with power via sliding contacts.
  • the electric motor can be flanged directly to the drive wheel become, which facilitates the constructive training.
  • the housing of the electric motor turns not exactly with the speed of the camshaft, but with the speed of the drive wheel, which, however, is not a significant difference in practice.
  • the drive shaft of the motor has a helical toothing Has threaded section which engages with a threaded section of the adjusting element stands. In this way, a very large reduction from a high-speed electric motor in a corresponding axial movement of the adjusting element.
  • the electric motor is designed as a stepper motor, which makes this possible easy control and reliable operation.
  • the electric motor can be advantageous to use the electric motor as a geared motor to train. Thanks to the integrated reduction gear, a high-speed Electric motor operated with particularly low moments.
  • FIG. 1 a section through an embodiment variant of the present invention.
  • a camshaft, not shown, of an internal combustion engine has a flange 2 at one end.
  • a camshaft drive component is located above a screw 3 4 firmly connected to the camshaft 1.
  • the component 4 is on one of his outer circumferential helical thread section 4a with a threaded section 5a of the adjusting element 5 in engagement.
  • the adjusting element 5 encompasses the component 4 and in turn has a threaded section 5b on its outer circumference.
  • This thread section 5b stands with a threaded section 6b of the drive wheel 6 for the camshaft 1 engaged, which is designed as a sprocket. Engages in the teeth 6a of the chain wheel 6 a drive chain, not shown.
  • a precisely defined one is defined via the drive chain Position of the drive wheel 6 in relation to the rotation of the crankshaft, which is also not is guaranteed.
  • the inner threaded section 5a of the adjusting element 5 is in opposite directions to the outer threaded portion 5b, so that by an axial displacement of the adjusting element 5 a rotation of the camshaft 1 with respect to the drive wheel 6 takes place.
  • a sleeve 7 is firmly connected to the flange 2 of the camshaft 1.
  • the Connection is via threaded bolts 8, which are screwed into the flange 2, and with a nut 9 are attached to the sleeve 7.
  • the threaded bolts 8 pass through bores 10 in the drive wheel 6, which bores 10 are formed as circular arc-shaped elongated holes are trained.
  • Spacers 11, 12 and 13 provide a precisely defined distance between the sleeve 7 and the flange 2 ago.
  • the spacer 12 is made smaller than the width of the elongated hole 10, while the spacers 11 and 13 have a larger diameter exhibit.
  • the width of the spacer 12 corresponds exactly to the thickness of the drive wheel 6 in this section, so that the axial position of the drive wheel is set without play is.
  • a spindle 14 has an external thread 14a, via which it with the adjusting element 5 is engaged.
  • the spindle 14 is driven by an electric motor 15, which is fixed is connected to the sleeve 7.
  • the connection is made via screws 16 that hold the electric motor 15 connect with a connecting component 17 fastened to the sleeve 7.
  • the spindle 14 is a roller bearing 20 in the radial direction stored relative to component 17.
  • a locking ring 21 secures the outer ring of the Rolling bearing 20.
  • the spindle 14 In the axial direction, the spindle 14 is in position by an axial bearing 22 fixed.
  • the axial bearing 22 is based on the one hand on a shoulder of the sleeve 7 against the washer 23, and on the other hand onto a washer 24 which is supported by a nut 25 the sleeve 7 is connected.
  • a shaft seal ring 26 prevents the penetration of engine oil to the electric motor 15.
  • the outer circumference of the shaft sealing ring 26 is connected to the sleeve 7 attached.
  • a nut 27 puts the exact axial position of the spindle 14 in over a sleeve 28 Regarding the thrust bearing 22 fixed.
  • the engine 15 is firmly connected to the camshaft 1.
  • the output shaft 29 of the motor 15 rotates Spindle 14.
  • the rotation of the spindle 14 relative to the camshaft 1 causes it moves the adjusting element 5 along the threaded section 14a in the axial direction, for example to the left in FIG. 1.
  • This displacement causes the Component 4, relative to the drive wheel 6 due to the opposite thread sections 4a / 5a or 6b / 5b. In this way, the camshaft 1 is adjusted with respect to the drive wheel 6.
  • the present invention makes it possible to control the valve timing of an internal combustion engine easy and safe to change. It is particularly advantageous that any Intermediate positions can be controlled.

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

Abstract

The device has an adjusting element (5) with two threaded sections (5a,b). The first section meshes with a threaded part (4a) of a component (4) fastened to the camshaft (1). The second meshes with a threaded part (6b) of the component carrying the drive pulley (6). The camshaft is connected to a flange (2) and this is connected to a sleeve-like part (7) on the electric motor (15) via connection elements (8), through which the drive pulley passes.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Verstellung einer Nockenwelle einer Brennkraftmaschine mit innerer Verbrennung in Bezug auf das sie antreibende Antriebsrad, mit einem Verstellelement, das einerseits mit einem das Antriebsrad tragenden Bauteil in Eingriff steht, und das andererseits mit einem mit der Nockenwelle fest verbundenen Bauteil in Eingriff steht, wobei durch eine Axialverschiebung des Verstellelements eine Verdrehung der Nockenwelle gegenüber dem Antriebsrad bewirkbar ist, sowie mit einem Elektromotor zur Verschiebung des Verstellelements in Axialrichtung, der fest mit der Nockenwelle verbunden ist und über Schleifkontakte mit Strom versorgt wird.The present invention relates to a device for adjusting a camshaft Internal combustion engine with respect to the drive wheel driving it, with an adjusting element that engages on the one hand with a component carrying the drive wheel stands, and on the other hand with a component firmly connected to the camshaft in Engagement is, with an axial displacement of the adjusting element a rotation of the Camshaft can be effected relative to the drive wheel, as well as with an electric motor Displacement of the adjusting element in the axial direction, which is firmly connected to the camshaft and is supplied with power via sliding contacts.

Um in verschiedenen Bereichen des Motorkennfeldes optimale Verbrauchs- und Abgaswerte zu erzielen, ist es erforderlich, die Ventilsteuerzeiten in Abhängigkeit verschiedener Betriebsparameter zu verändern. Eine solche Veränderung der Steuerzeiten kann in eleganter Weise durch eine Verdrehung der Nockenwelle in Bezug auf das sie antreibende Rad bewirkt werden. Die Nockenwelle einer Brennkraftmaschine wird üblicherweise durch ein Kettenrad, das mit der Kurbelwelle über eine Antriebskette verbunden ist, oder ein als Riemenscheibe ausgebildetes Antriebsrad, das über einen Zahnriemen mit der Kurbelwelle in Verbindung steht, angetrieben.To ensure optimum consumption and exhaust gas values in various areas of the engine map To achieve this, it is necessary to adjust the valve timing depending on various operating parameters to change. Such a change in tax times can be done in an elegant way caused by a rotation of the camshaft in relation to the wheel driving it. The camshaft of an internal combustion engine is usually driven by a sprocket is connected to the crankshaft via a drive chain, or one designed as a pulley Drive wheel, which is connected to the crankshaft via a toothed belt, driven.

Die GB 2 221 513 A zeigt eine Verstellvorrichtung für Nockenwellen, bei der ein Elektromotor eine Gruppe von Hebeln betätigt, die die Nockenwelle gegenüber dem Antriebsrad verdrehen. Zu diesem Zweck wird ein Betätigungselement, an dem die Hebel angelenkt sind, in Axialrichtung verschoben. Eine solche Lösung ist jedoch aufwendig und aufgrund der Vielzahl von Lagern mit einem großen Spiel behaftet.GB 2 221 513 A shows an adjusting device for camshafts, in which an electric motor operates a group of levers that rotate the camshaft relative to the drive wheel. For this purpose, an actuating element, on which the levers are articulated, in Axial direction shifted. Such a solution is complex and due to the large number bearing with a lot of play.

Aus der DE 41 10 088 C1 und aus der DE 39 29 619 A1 sind Verstelleinrichtungen bekannt, bei denen zwischen einem mit der Nockenwelle in Verbindung stehenden Bauteil und einem mit dem Antriebsrad in Verbindung stehenden Bauteil ein Verstellelement vorgesehen ist, das zwei Schrägverzahnungen aufweist, die mit entsprechenden Verzahnungen der Nockenwelle bzw. des Antriebsrades in Eingriff stehen. Durch eine Axialverschiebung dieses Verstellelements kann eine Verdrehung der Nockenwelle gegenüber dem Antriebsrad bewirkt werden. Eine Möglichkeit der Axialverschiebung des Verstellelements ist dabei die Betätigung durch einen Hydraulikkolben, der in Abhängigkeit von der erforderlichen Verstellung betätigt wird. Nachteilig bei dieser Lösung ist, daß zur Erzielung der erforderlichen Kräfte ein relativ großer Hydraulikkolben erforderlich ist, was einen großen baulichen Aufwand darstellt. Außerdem ist der Ölverbrauch durch die Betätigung des Kolbens relativ groß, was eine Belastung des Motors durch ein entsprechende Ölpumpe darstellt. Darüber hinaus kann bei einer solchen bekannten Vorrichtung die Nockenwelle nur zwischen zwei Endstellungen hin- und hergeschaltet werden. Adjustment devices are known from DE 41 10 088 C1 and from DE 39 29 619 A1, where between a component connected to the camshaft and a an adjusting element is provided with the drive wheel in connection with the component has two helical gears with the corresponding gears of the camshaft or the drive wheel are engaged. By an axial displacement of this adjustment element can cause the camshaft to rotate relative to the drive wheel become. One possibility of the axial displacement of the adjusting element is actuation by a hydraulic piston, which depends on the required adjustment is operated. The disadvantage of this solution is that to achieve the required forces relatively large hydraulic piston is required, which is a great deal of construction represents. In addition, the oil consumption by the operation of the piston is relatively large, what represents a load on the engine by an appropriate oil pump. Furthermore, can in such a known device, the camshaft only between two end positions be switched back and forth.

Weiters ist aus der DE 41 01 676 A1 eine elektrische Verstellvorrichtung bekannt, bei der ein Elektromotor vorgesehen ist, der über eine Gewindespindel das Verstellelement verschiebt. Da sich jedoch das Verstellelement im wesentlichen mit Nockenwellendrehzahl dreht, muß zwischen dem Elektromotor und dem Verstellelement ein Axialdrucklager vorgesehen sein, das die Relativbewegung zwischen dem verdrehfesten und dem sich drehenden Bauteil aufnimmt. Dieses Axialdrucklager ist bei der bekannten Lösung praktisch während des gesamten Motorbetriebs belastet, da durch die zwischen Antriebsrad und Nockenwelle wirkenden Torsionsmomente stets eine in Axialrichtung wirkende Kraft auf das Verstellelement ausgeübt wird. Dieses Axialdrucklager ist daher ein kritischer Bauteil, der die Lebensdauer des Motors einschränkt. Eine ähnliche Lösung ist in der DE 33 20 835 A1 beschrieben, wobei die gleichen Nachteile auftreten.Furthermore, an electrical adjustment device is known from DE 41 01 676 A1, in which a Electric motor is provided, which moves the adjusting element via a threaded spindle. However, since the adjusting element rotates essentially at the camshaft speed, it must an axial thrust bearing can be provided between the electric motor and the adjusting element, that absorbs the relative movement between the torsion-resistant and the rotating component. This thrust bearing is in the known solution practically throughout Engine operation is loaded because of the torsional moments acting between the drive wheel and the camshaft always exerted a force acting in the axial direction on the adjusting element becomes. This thrust bearing is therefore a critical part of the life of the engine restricted. A similar solution is described in DE 33 20 835 A1, the same Disadvantages occur.

Die DE 36 07 256 A beschreibt eine Vorrichtung, bei der ein Schrittmotor zur Verstellung der Nockenwelle vorgesehen ist, der einerseits mit der Nockenwelle und andererseits mit dem Antriebsrad verbunden ist. Da dieser Schrittmotor das gesamte Antriebsmoment der Nockenwelle aufnehmen muß, ist eine solche Lösung mit vernünftigem Aufwand nicht realisierbar.DE 36 07 256 A describes a device in which a stepper motor for adjusting the Camshaft is provided, on the one hand with the camshaft and on the other hand with the Drive wheel is connected. Because this stepper motor drives the entire camshaft torque Such a solution is not feasible with reasonable effort.

Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung der oben genannten Art derart weiterzubilden, daß mit vergleichsweise einfache Mitteln eine sichere und zuverlässige Verstellung der Nockenwelle erreicht wird, ohne die Lebensdauer des Motors einzuschränken.The object of the present invention is to provide a device of the type mentioned above to further develop that with comparatively simple means a safe and reliable adjustment the camshaft is reached without restricting the life of the engine.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das Verstellelement einen ersten Gewindeabschnitt, der mit einem Gewindeabschnitt des mit der Nockenwelle fest verbundenen Bauteils in Eingriff ist sowie einen zweiten Gewindeabschnitt, der mit einem Gewindeabschnitt des das Antriebsrad tragenden Bauteils in Eingriff ist, aufweist.According to the invention, this object is achieved in that the adjusting element has a first Threaded section which is connected to a threaded section of which is firmly connected to the camshaft Component is engaged as well as a second threaded section that with a threaded section of the component carrying the drive wheel is engaged.

Wesentlich an der vorliegenden Erfindung ist, daß sich der Elektromotor grundsätzlich mit der Nockenwelle mitdreht und daß bedingt durch die große Untersetzung, die duch die beiden Gewindeabschnitte gegeben ist, eine relativ geringe Momentenbelastung des Elektromotors erzielbar ist. Auf diese Weise kann auch eine aufwendige Übertragung der Betätigungskraft von einem an sich nicht drehenden Elektromotor auf die sich drehende Nockenwelle vermieden werden.It is essential to the present invention that the electric motor is fundamentally compatible with the Camshaft rotates and that due to the large reduction that the two Given threaded sections, a relatively low torque load on the electric motor is achievable. In this way, a complex transmission of the actuating force can be achieved avoided by a non-rotating electric motor on the rotating camshaft become.

Das erfindungsgemäße System ist selbsthemmend, so daß eine unerwünschte Verstellung des Systems nicht stattfinden kann. Weiters erfordert das System keine Wälzlager, die die Drehzahl der Nockenwelle aufnehmen müssen. Die Wälzlager des Systems selbst laufen insgesamt mit Nockenwellendrehzahl und müssen nur die Drehung des Elektromotors aufnehmen.The system of the invention is self-locking, so that an undesirable adjustment of the System cannot take place. Furthermore, the system does not require any rolling bearings that control the speed the camshaft. The rolling bearings of the system run as a whole with camshaft speed and only have to absorb the rotation of the electric motor.

In einer bevorzugten Ausführungsvariante der Erfindung ist vorgesehen, daß die Nockenwelle mit einem Flansch verbunden ist, daß der Elektromotor mit einem hülsenförmigen Bauteil verbunden ist und daß der Flansch über Verbindungselemente, die durch das Antriebsrad hindurchtreten, mit dem hülsenförmigen Bauteil fest verbunden ist. Auf diese Weise wird eine besonders kompakte Ausführung erreicht. Dabei treten Bolzen, die den Flansch mit der Hülse verbinden, durch bogenförmig ausgebildete Langlöcher im Antriebsrad hindurch.In a preferred embodiment of the invention it is provided that the camshaft is connected to a flange that the electric motor with a sleeve-shaped component is connected and that the flange via connecting elements through the drive wheel pass through, is firmly connected to the sleeve-shaped component. In this way, one particularly compact design achieved. In doing so, bolts enter the flange with the sleeve connect through arcuate slots in the drive wheel.

In einer alternativen Ausführungsvariante der Erfindung ist vorgesehen, daß der Elektromotor fest mit dem Antriebsrad verbunden ist und über Schleifkontakte mit Strom versorgt wird. Bei dieser Ausführungsvariante kann der Elektromotor direkt am Antriebsrad angeflanscht werden, was die konstruktive Ausbildung erleichtert. Das Gehäuse des Elektromotors dreht sich dabei nicht exakt mit der Drehzahl der Nockenwelle, sondern mit der Drehzahl des Antriebsrades, was jedoch in der Praxis keinen nennenswerten Unterschied darstellt.In an alternative embodiment of the invention it is provided that the electric motor is firmly connected to the drive wheel and is supplied with power via sliding contacts. At In this variant, the electric motor can be flanged directly to the drive wheel become, which facilitates the constructive training. The housing of the electric motor turns not exactly with the speed of the camshaft, but with the speed of the drive wheel, which, however, is not a significant difference in practice.

Insbesonders ist es vorteilhaft, wenn die Antriebswelle des Motors einen schräg verzahnten Gewindeabschnitt aufweist, der mit einem Gewindeabschnitt des Verstellelements in Eingriff steht. Auf diese Weise kann eine sehr große Untersetzung von einem schnell laufenden Elektromotor in eine entsprechende Axialbewegung des Verstellelements bewirkt werden.It is particularly advantageous if the drive shaft of the motor has a helical toothing Has threaded section which engages with a threaded section of the adjusting element stands. In this way, a very large reduction from a high-speed electric motor in a corresponding axial movement of the adjusting element.

Besonders günstig ist es, wenn der Elektromotor als Schrittmotor ausgebildet ist, dies ermöglicht eine einfache Ansteuerung und einen zuverlässigen Betrieb. In Abhängigkeit von der konstruktiven Auslegung kann es von Vorteil sein, den Elektromotor als Getriebemotor auszubilden. Durch das integrierte Untersetzungsgetriebe kann ein schnellaufender Elektromotor mit besonders geringen Momenten betrieben werden.It is particularly favorable if the electric motor is designed as a stepper motor, which makes this possible easy control and reliable operation. Depending on the constructive design, it can be advantageous to use the electric motor as a geared motor to train. Thanks to the integrated reduction gear, a high-speed Electric motor operated with particularly low moments.

In der Folge wird die Erfindung anhand der in den Figuren dargestellten Ausführungsvarianten näher erläutert. Die Figuren zeigen: Fig. 1 einen Schnitt durch eine Ausführungsvariante der vorliegenden Erfindung.As a result, the invention is based on the embodiment variants shown in the figures explained in more detail. The figures show: FIG. 1 a section through an embodiment variant of the present invention.

Eine nicht näher dargestellte Nockenwelle einer Brennkraftmaschine mit innerer Verbrennung besitzt an einem Ende einen Flansch 2. Über eine Schraube 3 ist ein Nockenwellen-Antriebsbauteil 4 fest mit der Nockenwelle 1 verbunden. Der Bauteil 4 steht über einen an seinem äußeren Umfang angebrachte schrägverzahnten Gewindeabschnitt 4a mit einem Gewindeabschnitt 5a des Verstellelements 5 in Eingriff. Das Verstellelement 5 umgreift den Bauteil 4 und besitzt seinerseits an seinem äußeren Umfang einen Gewindeabschnitt 5b. Dieser Gewindeabschnitt 5b steht mit einem Gewindeabschnitt 6b des Antriebsrades 6 für die Nockenwelle 1 in Eingriff, das als Kettenrad ausgebildet ist. In die Zähne 6a des Kettenrades 6 greift eine nicht dargestellte Antriebskette ein. Über die Antriebskette wird eine genau definierte Stellung des Antriebsrades 6 in Bezug auf die Drehung der Kurbelwelle, die ebenfalls nicht dargestellt ist, gewährleistet. Der innere Gewindeabschnitt 5a des Verstellelements 5 ist gegensinnig zu dem äußeren Gewindeabschnitt 5b ausgebildet, so daß durch eine Axialverschiebung des Verstellelements 5 eine Verdrehung der Nockenwelle 1 in Bezug auf das Antriebsrad 6 erfolgt. Mit dem Flansch 2 der Nockenwelle 1 ist eine Hülse 7 fest verbunden. Die Verbindung erfolgt über Gewindebolzen 8, die im Flansch 2 eingeschraubt sind, und die mit einer Mutter 9 an der Hülse 7 befestigt sind. Die Gewindebolzen 8 treten durch Bohrungen 10 im Antriebsrad 6 hindurch, welche Bohrungen 10 als kreisbogenförmig ausgeformte Langlöcher ausgebildet sind. Distanzscheiben 11, 12 und 13 stellen einen genau definierten Abstand zwischen der Hülse 7 und dem Flansch 2 her. Die Distanzscheibe 12 ist kleiner ausgeführt als die Breite des Langlochs 10, während die Distanzscheiben 11 und 13 einen größeren Durchmesser aufweisen. Die Breite der Distanzscheibe 12 entspricht genau der Dicke des Antriebsrades 6 in diesem Abschnitt, so daß auch die axiale Position des Antriebsrades spielfrei festgelegt ist. Eine Spindel 14 besitzt ein Außengewinde 14a, über das sie mit dem Verstellelement 5 in Eingriff steht. Die Spindel 14 wird von einem Elektromotor 15 angetrieben, der fest mit der Hülse 7 verbunden ist. Die Verbindung erfolgt über Schrauben 16, die den Elektromotor 15 mit einem an der Hülse 7 befestigten Verbindungsbauteil 17 verbinden. Eine Schleifringplatine 18, die mit dem Elektromotor 15 fest verbunden ist, nimmt Schleifringe 19 zur Versorgung des Elektromotors 15 auf. Die Spindel 14 ist über ein Wälzlager 20 in Radialrichtung gegenüber dem Bauteil 17 gelagert. Ein Sicherungsring 21 sichert den Außenring des Wälzlagers 20. In Axialrichtung wird die Spindel 14 durch ein Axiallager 22 in ihrer Position festgelegt. Das Axiallager 22 stützt sich einerseits auf eine an einem Ansatz der Hülse 7 anlegende Scheibe 23, und andererseits auf eine Scheibe 24 ab, die durch eine Mutter 25 mit der Hülse 7 verbunden ist. Ein Wellendichtring 26 verhindert das Eindringen von Motoröl zum Elektromotor 15. Der Wellendichtring 26 ist mit seinem äußeren Umfang mit der Hülse 7 befestigt. Eine Mutter 27 legt über einer Hülse 28 die genaue axiale Position der Spindel 14 in Bezug auf das Axiallager 22 fest.A camshaft, not shown, of an internal combustion engine has a flange 2 at one end. A camshaft drive component is located above a screw 3 4 firmly connected to the camshaft 1. The component 4 is on one of his outer circumferential helical thread section 4a with a threaded section 5a of the adjusting element 5 in engagement. The adjusting element 5 encompasses the component 4 and in turn has a threaded section 5b on its outer circumference. This thread section 5b stands with a threaded section 6b of the drive wheel 6 for the camshaft 1 engaged, which is designed as a sprocket. Engages in the teeth 6a of the chain wheel 6 a drive chain, not shown. A precisely defined one is defined via the drive chain Position of the drive wheel 6 in relation to the rotation of the crankshaft, which is also not is guaranteed. The inner threaded section 5a of the adjusting element 5 is in opposite directions to the outer threaded portion 5b, so that by an axial displacement of the adjusting element 5 a rotation of the camshaft 1 with respect to the drive wheel 6 takes place. A sleeve 7 is firmly connected to the flange 2 of the camshaft 1. The Connection is via threaded bolts 8, which are screwed into the flange 2, and with a nut 9 are attached to the sleeve 7. The threaded bolts 8 pass through bores 10 in the drive wheel 6, which bores 10 are formed as circular arc-shaped elongated holes are trained. Spacers 11, 12 and 13 provide a precisely defined distance between the sleeve 7 and the flange 2 ago. The spacer 12 is made smaller than the width of the elongated hole 10, while the spacers 11 and 13 have a larger diameter exhibit. The width of the spacer 12 corresponds exactly to the thickness of the drive wheel 6 in this section, so that the axial position of the drive wheel is set without play is. A spindle 14 has an external thread 14a, via which it with the adjusting element 5 is engaged. The spindle 14 is driven by an electric motor 15, which is fixed is connected to the sleeve 7. The connection is made via screws 16 that hold the electric motor 15 connect with a connecting component 17 fastened to the sleeve 7. A Slip ring plate 18, which is firmly connected to the electric motor 15, takes slip rings 19 to supply the electric motor 15. The spindle 14 is a roller bearing 20 in the radial direction stored relative to component 17. A locking ring 21 secures the outer ring of the Rolling bearing 20. In the axial direction, the spindle 14 is in position by an axial bearing 22 fixed. The axial bearing 22 is based on the one hand on a shoulder of the sleeve 7 against the washer 23, and on the other hand onto a washer 24 which is supported by a nut 25 the sleeve 7 is connected. A shaft seal ring 26 prevents the penetration of engine oil to the electric motor 15. The outer circumference of the shaft sealing ring 26 is connected to the sleeve 7 attached. A nut 27 puts the exact axial position of the spindle 14 in over a sleeve 28 Regarding the thrust bearing 22 fixed.

Bei der vorliegenden Ausführungsvariante ist der Motor 15 fest mit der Nockenwelle 1 verbunden. Wenn der Motor angesteuert wird, dreht die Abtriebswelle 29 des Motors 15 die Spindel 14. Durch die Drehung der Spindel 14 relativ zur Nockenwelle 1 wird bewirkt, daß sie das Verstellelement 5 entlang des Gewindeabschnitts 14a in Axialrichtung verschiebt, beispielsweise nach links in der Fig. 1. Durch diese Verschiebung erfolgt eine Verdrehung des Bauteils 4, relativ zum Antriebsrad 6 zufolge der gegenläufigen Gewindeabschnitte 4a/5a bzw. 6b/5b. Auf diese Weise wird die Nockenwelle 1 in Bezug auf am Antriebsrad 6 verstellt. Um eine völlige Trennung des Elektromotors 15 vom Ökaum der Brennkraftmaschine zu schaffen, muß an der Außenseite der Hülse 7 ein nicht dargestellter weiterer Wellendichtring vorgesehen sein, der außen in einer entsprechenden Trennwand, die ebenfalls nicht dargestellt ist, eingebaut ist. Durch die große Übersetzung des Elektromotors 15 kann erreicht werden, daß schon mit einem relativ geringen Drehmoment eine sichere Verstellung erreichbar ist.In the present embodiment variant, the engine 15 is firmly connected to the camshaft 1. When the motor is driven, the output shaft 29 of the motor 15 rotates Spindle 14. The rotation of the spindle 14 relative to the camshaft 1 causes it moves the adjusting element 5 along the threaded section 14a in the axial direction, for example to the left in FIG. 1. This displacement causes the Component 4, relative to the drive wheel 6 due to the opposite thread sections 4a / 5a or 6b / 5b. In this way, the camshaft 1 is adjusted with respect to the drive wheel 6. In order to completely separate the electric motor 15 from the ecaum of the internal combustion engine create, must be on the outside of the sleeve 7, not shown, another shaft seal be provided on the outside in a corresponding partition, which is also not shown is built in. Due to the large translation of the electric motor 15 can be achieved that a safe adjustment can be achieved with a relatively low torque.

Die vorliegende Erfindung ermöglicht es, die Steuerzeiten der Ventile einer Brennkraftmaschine in einfacher Weise und sicher zu verändern. Besonders vorteilhaft ist, daß auch beliebige Zwischenstellungen angesteuert werden können.The present invention makes it possible to control the valve timing of an internal combustion engine easy and safe to change. It is particularly advantageous that any Intermediate positions can be controlled.

Claims (8)

Vorrichtung zur Verstellung einer Nockenwelle (1) einer Brennkraftmaschine mit innerer Verbrennung in Bezug auf das sie antreibende Antriebsrad (6), mit einem Verstellelement (5), das einerseits mit einem das Antriebsrad (6) tragenden Bauteil in Eingriff steht, und das andererseits mit einem mit der Nockenwelle (1) fest verbundenen Bauteil (4) in Eingriff steht, wobei durch eine Axialverschiebung des Verstellelements (5) eine Verdrehung der Nockenwelle (1) gegenüber dem Antriebsrad (6) bewirkbar ist, sowie mit einem Elektromotor (15) zur Verschiebung des Verstellelements (5) in Axialrichtung, der fest mit der Nockenwelle (1) verbunden ist und über Schleifkontakte (19) mit Strom versorgt wird, dadurch gekennzeichnet , daß das Verstellelement (5) einen ersten Gewindeabschnitt (5a), der mit einem Gewindeabschnitt (4a) des mit der Nockenwelle (1) fest verbundenen Bauteils (4) in Eingriff ist sowie einen zweiten Gewindeabschnitt (5b), der mit einem Gewindeabschnitt (6b) des das Antriebsrad (6) tragenden Bauteils in Eingriff ist, aufweist.Device for adjusting a camshaft (1) of an internal combustion engine with respect to the drive wheel (6) driving it, with an adjusting element (5) which, on the one hand, engages with a component carrying the drive wheel (6) and, on the other hand, with a component (4) which is firmly connected to the camshaft (1) is engaged, the camshaft (1) being able to be rotated relative to the drive wheel (6) by an axial displacement of the adjusting element (5), and an electric motor (15) for Displacement of the adjusting element (5) in the axial direction, which is firmly connected to the camshaft (1) and is supplied with power via sliding contacts (19), characterized in that the adjusting element (5) has a first threaded section (5a) which is provided with a threaded section (4a) of the component (4) which is fixedly connected to the camshaft (1) and a second threaded section (5b) which is connected to a threaded section (6b) of the drive shaft ad (6) supporting component is engaged. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Nockenwelle (1) mit einem Flansch (2) verbunden ist, daß der Elektromotor (15) mit einem hülsenförmigen Bauteil (7) verbunden ist und daß der Flansch (2) über Verbindungselemente (8), die durch das Antriebsrad (6) hindurchtreten, mit dem hülsenförmigen Bauteil (7) fest verbunden ist.Device according to claim 1, characterized in that the camshaft (1) is connected to a flange (2), that the electric motor (15) is connected to a sleeve-shaped component (7) and that the flange (2) is connected via connecting elements (8) which pass through the drive wheel (6), is fixedly connected to the sleeve-shaped component (7). Vorrichtung zur Verstellung einer Nockenwelle (1) einer Brennkraftmaschine mit innerer Verbrennung in Bezug auf das sie antreibende Antriebsrad (6), mit einem Verstellelement (5), das einerseits mit einem das Antriebsrad (6) tragenden Bauteil in Eingriff steht, und das andererseits mit einem mit der Nockenwelle (1) fest verbundenen Bauteile (4) in Eingriff steht, wobei durch eine Axialverschiebung des Verstellelements (5) eine Verdrehung der Nockenwelle (1) gegenüber dem Antriebsrad (6) bewirkbar ist, sowie mit einem Elektromotor (15) zur Verschiebung des Verstellelements (5) in Axialrichtung, der fest mit dem Antriebsrad (6) verbunden ist und über Schleifkontakte (19) mit Strom versorgt wird, dadurch gekennzeichnet, daß das Verstellelement (5) einen ersten Gewindeabschnitt (5a), der mit einem Gewindeabschnitt (4a) des mit der Nockenwelle (1) fest verbundenen Bauteils (4) in Eingriff ist sowie einen zweiten Gewindeabschnitt (5b), der mit einem Gewindeabschnitt (6b) des das Antriebsrad (6) tragenden Bauteils in Eingriff ist, aufweist.Device for adjusting a camshaft (1) of an internal combustion engine with respect to the drive wheel (6) driving it, with an adjusting element (5) which, on the one hand, engages with a component carrying the drive wheel (6) and, on the other hand, with a component (4) firmly connected to the camshaft (1) is engaged, the camshaft (1) being able to be rotated relative to the drive wheel (6) by means of an axial displacement of the adjusting element (5), and with an electric motor (15) Displacement of the adjusting element (5) in the axial direction, which is firmly connected to the drive wheel (6) and is supplied with current via sliding contacts (19), characterized in that the adjusting element (5) has a first threaded section (5a) which is provided with a threaded section (4a) of the component (4) which is fixedly connected to the camshaft (1) and a second threaded section (5b) which is connected to a threaded section (6b) of the drive Rad (6) supporting component is engaged. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Antriebswelle (29) des Motors (15) einen schräg verzahnten Gewindeabschnitt aufweist, der mit einem Gewindeabschnitt des Verstellelements in Eingriff steht. Device according to one of claims 1 to 3, characterized in that the drive shaft (29) of the motor (15) has an obliquely toothed threaded section which is in engagement with a threaded section of the adjusting element. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der erste Gewindeabschnitt (5a) und der zweite Gewindeabschnitt (5b) an der Innen- bzw. Außenseite eines hohlzylindrischen Körpers angeordnet ist.Device according to one of claims 1 to 4, characterized in that the first threaded section (5a) and the second threaded section (5b) is arranged on the inside or outside of a hollow cylindrical body. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Elektromotor (15) als Schrittmotor ausgebildet ist.Device according to one of claims 1 to 5, characterized in that the electric motor (15) is designed as a stepper motor. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Elektromotor (15) als Getriebemotor ausgebildet ist.Device according to one of claims 1 to 6, characterized in that the electric motor (15) is designed as a geared motor. Brennkraftmaschine mit innerer Verbrennung, dadurch gekennzeichnet, daß sie eine Vorrichtung nach einem der Ansprüche 1 bis 7 aufweist.Internal combustion engine with internal combustion, characterized in that it has a device according to one of Claims 1 to 7.
EP98890261A 1997-09-19 1998-09-10 Device for variable camshaft timing in an internal combustion engine Expired - Lifetime EP0903470B1 (en)

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AT98890261T ATE249573T1 (en) 1997-09-19 1998-09-10 DEVICE FOR ADJUSTING A CAMSHAFT OF AN INTERNAL COMBUSTION ENGINE

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AT0158697A AT407282B (en) 1997-09-19 1997-09-19 DEVICE FOR ADJUSTING A CAMSHAFT
AT158697 1997-09-19
AT1586/97 1997-09-19

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FR3027055A1 (en) * 2014-10-14 2016-04-15 Renault Sa VALVE OPENING / CLOSING TIMER OFFSET CONTROL FOR A MOTOR VEHICLE ENGINE

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US6257186B1 (en) * 1999-03-23 2001-07-10 Tcg Unitech Aktiengesellschaft Device for adjusting the phase angle of a camshaft of an internal combustion engine
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FR3027055A1 (en) * 2014-10-14 2016-04-15 Renault Sa VALVE OPENING / CLOSING TIMER OFFSET CONTROL FOR A MOTOR VEHICLE ENGINE

Also Published As

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ATA158697A (en) 2000-06-15
ATE249573T1 (en) 2003-09-15
EP0903470B1 (en) 2003-09-10
DE59809548D1 (en) 2003-10-16
US5979382A (en) 1999-11-09
AT407282B (en) 2001-02-26

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