EP0500622B1 - Drive arrangement for a camshaft fitted in the cylinder head of an internal combustion engine - Google Patents

Drive arrangement for a camshaft fitted in the cylinder head of an internal combustion engine Download PDF

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Publication number
EP0500622B1
EP0500622B1 EP90916254A EP90916254A EP0500622B1 EP 0500622 B1 EP0500622 B1 EP 0500622B1 EP 90916254 A EP90916254 A EP 90916254A EP 90916254 A EP90916254 A EP 90916254A EP 0500622 B1 EP0500622 B1 EP 0500622B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
combustion engine
internal combustion
drive wheel
cylinder head
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.)
Expired - Lifetime
Application number
EP90916254A
Other languages
German (de)
French (fr)
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EP0500622A1 (en
Inventor
Wilhelm Hannibal
Johannes Steinwart
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Audi AG
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Audi AG
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Filing date
Publication date
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Publication of EP0500622A1 publication Critical patent/EP0500622A1/en
Application granted granted Critical
Publication of EP0500622B1 publication Critical patent/EP0500622B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—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
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2102—Adjustable

Definitions

  • the invention relates to a drive device for a camshaft mounted in the cylinder head of an internal combustion engine according to the preamble of claim 1.
  • the servomotor is arranged axially in front of the drive wheel in a machine housing cover.
  • This arrangement increases the dimension of the internal combustion engine in the longitudinal direction.
  • the internal combustion engine is installed lengthways in a motor vehicle, this leads to space problems since, for aerodynamic reasons, a flat engine compartment cover sloping forward is desired. It is therefore hardly possible to install such an internal combustion engine with variable valve control in an existing vehicle.
  • the invention has for its object to provide a drive device of the generic type with which the problems described when installing the internal combustion engine in a motor vehicle are avoided.
  • This object is achieved in that the servomotor is arranged adjacent to the end of the camshaft facing away from the drive wheel, and in that the actuator of the servomotor is connected to the switching element by a shift rod passing through the camshaft.
  • the servomotor can be accommodated without any problems since it sits at a point at which the bonnet rises towards the windshield.
  • the drive wheel and the camshaft are preferably mounted independently of one another in the cylinder head, which results in a much simpler construction than in the prior art.
  • the two external toothings of the switching element are arranged on separate sections which are connected to one another in a rotationally fixed but angularly movable manner.
  • Fig. 1, 1 denotes the cylinder head of a valve-controlled reciprocating piston internal combustion engine, in which a camshaft 3 is supported via bearings 2 and carries cams 4 with which intake and / or exhaust valves, not shown, of the internal combustion engine are actuated.
  • a drive wheel 5, which is driven by the crankshaft of the internal combustion engine, is mounted in the cylinder head 1 coaxially with the camshaft 3.
  • a switching element 6 is used, which has two axially adjacent external toothings 7 and 8, which include different angles with the longitudinal center axis of the camshaft 3.
  • the external toothing 7 is designed as a straight toothing and the external toothing 8 as a helical toothing.
  • the external toothing 8 could also be designed as a straight toothing and the external toothing 7 as a helical toothing.
  • both the external toothing 7 and the external toothing 8 are helical teeth, but with opposite or different oblique positions.
  • the external toothing 7 engages in a corresponding internal toothing 9 in the hollow hub 10 of the drive wheel 5 and the external toothing 8 engages in a corresponding internal toothing 11 in a longitudinal bore 12 of the camshaft 3.
  • the switching element 6 can be axially displaced by a servomotor 13.
  • the servomotor is arranged on the end of the camshaft 3 facing away from the drive wheel 5 and, in the exemplary embodiment, has a hydraulic cylinder 14 which is connected in a rotationally fixed manner to the camshaft 3 by its cover 20 and with its hub 22 in a bearing 15 coaxial with the camshaft bearings 2 is stored.
  • a piston 16 is displaceably arranged in the cylinder 14, from which a switching rod 17 extends, which is connected to the actuating element 6.
  • a spring 18 in the cover 20 strives to move the piston 16 into its left end position in FIG. 1.
  • the piston 16 forms a hydraulic chamber 19 with the cylinder 14.
  • a sleeve 21 is seated in the hub 22, in which a valve body 23 is slidably arranged with two longitudinal grooves 24 and 25, of which the first longitudinal groove 24 has an opening 28 in the sleeve 21 communicates with the hydraulic chamber 19 and the second longitudinal groove 25 is open to the interior of the cylinder head 1.
  • the valve body 23 is under the action of a spring 26, which strives to hold the valve body 23 in the position shown, in which the first longitudinal groove 24 via a channel 27 in the hub 22 and in the sleeve 21 in connection with the bearing 15 stands so that the hydraulic chamber 19 pressure oil is supplied from the bearing 15 and the piston 16 is moved against the action of the spring 18 in the right end position shown.
  • the valve body 23 can be moved to the right by an electromagnet 28 against the action of the spring 26.
  • the first longitudinal groove 24 is controlled by the channel 27 and the second longitudinal groove 25 through a further opening 29 in the sleeve 21 with the hydraulic chamber 19 in connection. This can reduce the pressure in the hydraulic chamber 19 and the spring 18 can move the piston 16 to the left. This causes a corresponding displacement of the actuating element 6, the camshaft 3 being rotated relative to the drive wheel 5 due to the helical teeth 8, 11
  • the drive wheel or its hub 10 is mounted in the cylinder head 1 independently of the camshaft 3.
  • the external toothings 7 and 8 of the switching element 6 can be arranged on separate sections which are connected to one another in a rotationally fixed but angularly movable manner by a cardan joint 30 indicated schematically in FIG. 2.
  • the servomotor 13 is shown in the exemplary embodiment as a hydraulic motor, the actuator (piston 16) of which is displaced in one direction by the spring 18 and in the other direction by oil pressure.
  • the actuator rod 16
  • the actuator is moved in both directions by oil pressure.
  • the arrangement of the servomotor 13 on the end of the camshaft 3 facing away from the drive wheel saves the space otherwise required for accommodating the servomotor in front of the drive wheel 5.
  • the problems in accommodating the internal combustion engine in the engine compartment of a motor vehicle are thereby considerably reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

A drive arrangement for a camshaft (1) of an internal combustion engine is fitted with a device for rotating the camshaft (3) relatively to a coaxial drive pinion (5) having a switching component (6) which co-operates via a straight-cut gear (7) with the drive pinion (5) and via an oblique-cut gear (8) with the camshaft (3) and can be axially shifted by an adjusting motor (13). The adjusting motor (13) is arranged at the end of the camshaft opposite the drive pinion (5). This prevents the axial length of the internal combustion engine from being extended beyond the drive pinion (5) by the adjusting motor.

Description

Die Erfindung bezieht sich auf eine Antriebsvorrichtung für eine im Zylinderkopf einer Brennkraftmaschine gelagerte Nockenwelle entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a drive device for a camshaft mounted in the cylinder head of an internal combustion engine according to the preamble of claim 1.

Bei einer bekannten Antriebsvorrichtung dieser Art (DE-A 36 16 134) ist der Stellmotor axial vor dem Antriebsrad in einem Maschinengehäusedeckel angeordnet. Durch diese Anordnung vergrößert sich die Abmessung der Brennkraft-maschine in Längsrichtung. Dies führt bei einem Längseinbau der Brennkraftmaschine in ein Kraftfahrzeug zu Platzproblemen, da aus aerodynamischen Gründen ein flacher, nach vorn abfallender Motorraumdeckel erwünscht ist. Es ist daher kaum möglich, eine derartige Brennkraftmaschine mit variabler Ventilsteuerung in ein bestehendes Fahrzeug einzubauen.In a known drive device of this type (DE-A 36 16 134), the servomotor is arranged axially in front of the drive wheel in a machine housing cover. This arrangement increases the dimension of the internal combustion engine in the longitudinal direction. When the internal combustion engine is installed lengthways in a motor vehicle, this leads to space problems since, for aerodynamic reasons, a flat engine compartment cover sloping forward is desired. It is therefore hardly possible to install such an internal combustion engine with variable valve control in an existing vehicle.

Der Erfindung liegt die Aufgabe zugrunde, eine Antriebsvorrichtung der gattungsgemäßen Art zu schaffen, mit welcher die geschilderten Probleme beim Einbau der Brennkraftmaschine in ein Kraftfahrzeug vermieden sind.The invention has for its object to provide a drive device of the generic type with which the problems described when installing the internal combustion engine in a motor vehicle are avoided.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Stellmotor dem vom Antriebsrad abgewandten Ende der Nockenwelle benachbart angeordnet ist und daß das Stellglied des Stellmotors mit dem Schaltelement durch eine die Nockenwelle durchsetzende Schaltstange verbunden ist.This object is achieved in that the servomotor is arranged adjacent to the end of the camshaft facing away from the drive wheel, and in that the actuator of the servomotor is connected to the switching element by a shift rod passing through the camshaft.

Bei dem erfindungsgemäßen Vorschlag kann der Stellmotor problemlos untergebracht werden, da er an einer Stelle sitzt, an welcher die Motorraumhaube zur Windschutzscheibe hin ansteigt.In the proposal according to the invention, the servomotor can be accommodated without any problems since it sits at a point at which the bonnet rises towards the windshield.

Vorzugsweise sind das Antriebsrad und die Nockenwelle unabhängig voneinander im Zylinderkopf gelagert, wodurch sich gegenüber dem Stand der Technik ein wesentlich einfacherer Aufbau ergibt. Um dabei Fluchtungsfehler zwischen dem Antriebsrad und der Nockenwelle ausgleichen zu können, sind die beiden Außenverzahnungen des Schaltelements auf gesonderten Abschnitten angeordnet, die drehfest, jedoch winkelbeweglich miteinander verbunden sind.The drive wheel and the camshaft are preferably mounted independently of one another in the cylinder head, which results in a much simpler construction than in the prior art. In order to be able to compensate for misalignments between the drive wheel and the camshaft, the two external toothings of the switching element are arranged on separate sections which are connected to one another in a rotationally fixed but angularly movable manner.

Ein Ausführungsbeispiel der Erfindung wird im folgenden unter Bezugnahme auf die Zeichnungen beschrieben. Es zeigt:

Fig. 1
einen Teil-Längsschnitt eines Zylinderkopfes einer Brennkraftmaschine in einer waagrechten, durch eine Nockenwelle gelegten Ebene, und
Fig. 2
eine Ansicht der das Schaltelement, die Schaltstange und das Stellglied des Stellmotors umfassenden Baugruppe.
An embodiment of the invention is described below with reference to the drawings. It shows:
Fig. 1
a partial longitudinal section of a cylinder head of an internal combustion engine in a horizontal plane through a camshaft, and
Fig. 2
a view of the switching element, the switching rod and the actuator of the actuator comprising comprehensive assembly.

In Fig. 1 ist mit 1 der Zylinderkopf einer ventilgesteuerten Hubkolben-Brennkraftmaschine bezeichnet, in dem über Lager 2 eine Nockenwelle 3 gelagert ist, die Nocken 4 trägt, mit denen nicht gezeigte Einlaß- und/oder Auslaßventile der Brennkraftmaschine betätigt werden. Koaxial zu der Nockenwelle 3 ist im Zylinderkopf 1 ein Antriebsrad 5 gelagert, das von der Kurbelwelle der Brennkraftmaschine angetrieben wird. Zur Übertragung des Antriebs vom Antriebsrad 5 auf die Nockenwelle 3 dient ein Schaltelement 6, das zwei axial nebeneinander liegende Außenverzahnungen 7 und 8 aufweist, die unterschiedliche Winkel mit der Längsmittelachse der Nockenwelle 3 einschließen. Im Ausführungsbeispiel ist die Außenverzahnung 7 als Geradverzahnung und die Außenverzahnung 8 als Schrägverzahnung ausgebildet. Es könnte jedoch auch die Außenverzahnung 8 als Geradverzahnung und die Außenverzahnung 7 als Schrägverzahnung ausgebildet sein.In Fig. 1, 1 denotes the cylinder head of a valve-controlled reciprocating piston internal combustion engine, in which a camshaft 3 is supported via bearings 2 and carries cams 4 with which intake and / or exhaust valves, not shown, of the internal combustion engine are actuated. A drive wheel 5, which is driven by the crankshaft of the internal combustion engine, is mounted in the cylinder head 1 coaxially with the camshaft 3. To transfer the drive from the drive wheel 5 to the camshaft 3, a switching element 6 is used, which has two axially adjacent external toothings 7 and 8, which include different angles with the longitudinal center axis of the camshaft 3. In the exemplary embodiment, the external toothing 7 is designed as a straight toothing and the external toothing 8 as a helical toothing. However, the external toothing 8 could also be designed as a straight toothing and the external toothing 7 as a helical toothing.

Schließlich besteht auch die Möglichkeit, sowohl die Außenverzahnung 7 als auch die Außenverzahnung 8 als Schrägverzahnung, jedoch mit entgegengesetzter oder unterschiedlicher Schrägstellung, auszuführen. Die Außenverzahnung 7 greift in eine entsprechende Innenverzahnung 9 in der hohlen Nabe 10 des Antriebsrades 5 ein und die Außenverzahnung 8 greift in eine entsprechende Innenverzahnung 11 in einer Längsbohrung 12 der Nockenwelle 3 ein. Das Schaltelement 6 kann durch einen Stellmotor 13 axial verschoben werden. Der Stellmotor ist an dem von dem Antriebsrad 5 abgewandten Ende der Nockenwelle 3 angeordnet und weist im Ausführungsbeispiel einen Hydraulikzylinder 14 auf, der durch seinen Deckel 20 drehfest mit der Nockenwelle 3 verbunden ist und mit seiner Nabe 22 in einem mit den Nockenwellenlagern 2 koaxialen Lager 15 gelagert ist. Im Zylinder 14 ist verschiebbar ein Kolben 16 angeordnet, von dem eine Schaltstange 17 ausgeht, die mit dem Stellelement 6 verbunden ist. Eine Feder 18 im Deckel 20 ist bestrebt, den Kolben 16 in seine in Fig. 1 linke Endstellung zu bewegen. Der Kolben 16 bildet mit dem Zylinder 14 eine Hydraulikkammer 19. In der Nabe 22 sitzt eine Hülse 21, in der verschiebbar ein Ventilkörper 23 mit zwei Längsnuten 24 und 25 angeordnet ist, von denen die erste Längsnut 24 über eine Öffnung 28 in der Hülse 21 mit der Hydraulikkammer 19 in Verbindung steht und die zweite Längsnut 25 zum Inneren des Zylinderkopfes 1 hin offen ist. Der Ventilkörper 23 steht unter der Wirkung einer Feder 26, die bestrebt ist, den Ventilkörper 23 in der dargestellten Stellung zu halten, in welcher die erste Längsnut 24 über einen Kanal 27 in der Nabe 22 und in der Hülse 21 mit dem Lager 15 in Verbindung steht, so daß der Hydraulikkammer 19 Drucköl aus dem Lager 15 zugeführt wird und der Kolben 16 entgegen der Wirkung der Feder 18 in die dargestellte rechte Endlage verschoben wird. Der Ventilkörper 23 kann durch einen Elektromagneten 28 entgegen der Wirkung der Feder 26 nach rechts verschoben werden. In dieser Stellung ist die erste Längsnut 24 von dem Kanal 27 abgesteuert und die zweite Längsnut 25 durch eine weitere Öffnung 29 in der Hülse 21 mit der Hydraulikkammer 19 in Verbindung. Dadurch kann sich der Druck in der Hydraulikkammer 19 abbauen und die Feder 18 kann den Kolben 16 nach links verschieben. Dies bewirkt eine entsprechende Verschiebung des Stellelements 6, wobei aufgrund der Schrägverzahnung 8, 11 eine Verdrehung der Nockenwelle 3 relativ zum Antriebsrad 5 stattfindetFinally, there is also the possibility of designing both the external toothing 7 and the external toothing 8 as helical teeth, but with opposite or different oblique positions. The external toothing 7 engages in a corresponding internal toothing 9 in the hollow hub 10 of the drive wheel 5 and the external toothing 8 engages in a corresponding internal toothing 11 in a longitudinal bore 12 of the camshaft 3. The switching element 6 can be axially displaced by a servomotor 13. The servomotor is arranged on the end of the camshaft 3 facing away from the drive wheel 5 and, in the exemplary embodiment, has a hydraulic cylinder 14 which is connected in a rotationally fixed manner to the camshaft 3 by its cover 20 and with its hub 22 in a bearing 15 coaxial with the camshaft bearings 2 is stored. A piston 16 is displaceably arranged in the cylinder 14, from which a switching rod 17 extends, which is connected to the actuating element 6. A spring 18 in the cover 20 strives to move the piston 16 into its left end position in FIG. 1. The piston 16 forms a hydraulic chamber 19 with the cylinder 14. A sleeve 21 is seated in the hub 22, in which a valve body 23 is slidably arranged with two longitudinal grooves 24 and 25, of which the first longitudinal groove 24 has an opening 28 in the sleeve 21 communicates with the hydraulic chamber 19 and the second longitudinal groove 25 is open to the interior of the cylinder head 1. The valve body 23 is under the action of a spring 26, which strives to hold the valve body 23 in the position shown, in which the first longitudinal groove 24 via a channel 27 in the hub 22 and in the sleeve 21 in connection with the bearing 15 stands so that the hydraulic chamber 19 pressure oil is supplied from the bearing 15 and the piston 16 is moved against the action of the spring 18 in the right end position shown. The valve body 23 can be moved to the right by an electromagnet 28 against the action of the spring 26. In this position, the first longitudinal groove 24 is controlled by the channel 27 and the second longitudinal groove 25 through a further opening 29 in the sleeve 21 with the hydraulic chamber 19 in connection. This can reduce the pressure in the hydraulic chamber 19 and the spring 18 can move the piston 16 to the left. This causes a corresponding displacement of the actuating element 6, the camshaft 3 being rotated relative to the drive wheel 5 due to the helical teeth 8, 11

Wie ersichtlich, ist das Antriebsrad bzw. dessen Nabe 10 unabhängig von der Nockenwelle 3 im Zylinderkopf 1 gelagert. Um Fluchtungsfehler zwischen der Nabe 10 und der Nockenwelle 3 auszugleichen, können die Außenverzahnungen 7 und 8 des Schaltelements 6 auf gesonderten Abschnitten angeordnet sein, die durch ein in Fig. 2 schematisch angedeutetes Kardangelenk 30 drehfest, jedoch winkelbeweglich miteinander verbunden sind.As can be seen, the drive wheel or its hub 10 is mounted in the cylinder head 1 independently of the camshaft 3. In order to compensate for misalignment between the hub 10 and the camshaft 3, the external toothings 7 and 8 of the switching element 6 can be arranged on separate sections which are connected to one another in a rotationally fixed but angularly movable manner by a cardan joint 30 indicated schematically in FIG. 2.

Der Stellmotor 13 ist im Ausführungsbeispiel als Hydraulikmotor dargestellt, dessen Stellglied (Kolben 16) in der einen Richtung durch die Feder 18 und in der anderen Richtung durch Öldruck verschoben wird. Anstelle dieses einfach wirkenden Hydraulikmotors kann jedoch auch ein doppelt wirkender Hydraulikmotor entsprechend dem Stand der Technik vorgesehen sein, bei welchem das Stellglied in beiden Richtungen durch Öldruck bewegt wird.The servomotor 13 is shown in the exemplary embodiment as a hydraulic motor, the actuator (piston 16) of which is displaced in one direction by the spring 18 and in the other direction by oil pressure. Instead of this single-acting hydraulic motor, however, a double-acting hydraulic motor according to the prior art can also be provided, in which the actuator is moved in both directions by oil pressure.

Durch die Anordnung des Stellmotors 13 an dem vom Antriebsrad abgewandten Ende der Nockenwelle 3 wird der sonst erforderliche Platz für die Unterbringung des Stellmotors vor dem Antriebsrad 5 eingespart. Dadurch werden die Probleme bei der Unterbringung der Brennkraftmaschine im Motorraum eines Kraftfahrzeuges erheblich verringert.The arrangement of the servomotor 13 on the end of the camshaft 3 facing away from the drive wheel saves the space otherwise required for accommodating the servomotor in front of the drive wheel 5. The problems in accommodating the internal combustion engine in the engine compartment of a motor vehicle are thereby considerably reduced.

Claims (2)

  1. A drive arrangement for a camshaft (3) mounted in the cylinder head (1) of an internal combustion engine with a facility for rotating the camshaft relative to a coaxial drive wheel (5) which is in driving connection with the crankshaft of the internal combustion engine, which facility has a switching component (6), which can be shifted axially between two end positions by a servo motor (13) and interacts over a first gear-tooth system (7, 9) with the drive wheel (5) and over a second gear-tooth system (8, 11) with the camshaft (3), each gear-tooth system comprising an external tooth system (7 and 8), which is provided at the switching component (6), and an internal tooth system (9 and 11), which ist provided in the hub (10) of the drive wheel (5) and in the camshaft (3), resp. and the two geartooth systems enclosing different angles with the longitudinal center line of the camshaft, characterized in that the servo motor (13) is disposed adjacent to the end of the camshaft (3) away from the drive wheel (5) and that the control element (16) of the servo motor (13) is connected with the switching component(6) by a switching rod (17) which extends through the camshaft (3).
  2. The drive arrangement of claim 1, characterized in that the drive wheel (5) and the camshaft (3) are mounted independently of one another in the cylinder head (1) and that the two external tooth systems (7, 8) of the switching component (6) are disposed on separate sections, which are connected so that they cannot rotate relative to one another, but yet so that the angle between them can be varied.
EP90916254A 1989-11-11 1990-10-26 Drive arrangement for a camshaft fitted in the cylinder head of an internal combustion engine Expired - Lifetime EP0500622B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3937628A DE3937628A1 (en) 1989-11-11 1989-11-11 DRIVE DEVICE FOR A CAMSHAFT BEARED IN THE CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
DE3937628 1989-11-11

Publications (2)

Publication Number Publication Date
EP0500622A1 EP0500622A1 (en) 1992-09-02
EP0500622B1 true EP0500622B1 (en) 1993-06-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90916254A Expired - Lifetime EP0500622B1 (en) 1989-11-11 1990-10-26 Drive arrangement for a camshaft fitted in the cylinder head of an internal combustion engine

Country Status (4)

Country Link
US (1) US5211141A (en)
EP (1) EP0500622B1 (en)
DE (2) DE3937628A1 (en)
WO (1) WO1991007574A1 (en)

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JPH07238820A (en) * 1994-02-25 1995-09-12 Ofic Co Variable left quantity valve drive device
DE4406983C1 (en) * 1994-03-03 1995-03-23 Bayerische Motoren Werke Ag Device for adjusting the rotational angle of a shaft relative to a driving gear, especially a camshaft of an internal combustion engine
KR19980049864A (en) * 1996-12-20 1998-09-15 박병재 Intake / exhaust valve open / close variable device of internal combustion engine
GB2327482A (en) * 1997-06-09 1999-01-27 Torrington Co Composite camshaft with internal variable cam timing mechanism
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Also Published As

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EP0500622A1 (en) 1992-09-02
DE3937628A1 (en) 1991-05-16
DE59001730D1 (en) 1993-07-15
US5211141A (en) 1993-05-18
WO1991007574A1 (en) 1991-05-30

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